зеркало из https://github.com/mozilla/gecko-dev.git
3745 строки
146 KiB
C++
3745 строки
146 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=2 sw=2 et tw=78:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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/*
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* structures that represent things to be painted (ordered in z-order),
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* used during painting and hit testing
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*/
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#ifndef NSDISPLAYLIST_H_
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#define NSDISPLAYLIST_H_
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#include "mozilla/Attributes.h"
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#include "mozilla/DebugOnly.h"
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#include "nsCOMPtr.h"
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#include "nsContainerFrame.h"
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#include "nsPoint.h"
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#include "nsRect.h"
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#include "plarena.h"
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#include "Layers.h"
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#include "nsRegion.h"
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#include "nsDisplayListInvalidation.h"
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#include "DisplayListClipState.h"
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#include "LayerState.h"
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#include "FrameMetrics.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/gfx/UserData.h"
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#include <stdint.h>
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#include "nsTHashtable.h"
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#include <stdlib.h>
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#include <algorithm>
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class nsIContent;
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class nsRenderingContext;
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class nsDisplayTableItem;
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class nsISelection;
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class nsDisplayLayerEventRegions;
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class nsDisplayScrollInfoLayer;
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class nsCaret;
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namespace mozilla {
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class FrameLayerBuilder;
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namespace layers {
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class Layer;
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class ImageLayer;
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class ImageContainer;
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} //namespace
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namespace gfx {
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class VRHMDInfo;
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} //namespace
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} //namespace
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// A set of blend modes, that never includes OP_OVER (since it's
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// considered the default, rather than a specific blend mode).
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typedef mozilla::EnumSet<mozilla::gfx::CompositionOp> BlendModeSet;
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/*
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* An nsIFrame can have many different visual parts. For example an image frame
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* can have a background, border, and outline, the image itself, and a
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* translucent selection overlay. In general these parts can be drawn at
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* discontiguous z-levels; see CSS2.1 appendix E:
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* http://www.w3.org/TR/CSS21/zindex.html
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*
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* We construct a display list for a frame tree that contains one item
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* for each visual part. The display list is itself a tree since some items
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* are containers for other items; however, its structure does not match
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* the structure of its source frame tree. The display list items are sorted
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* by z-order. A display list can be used to paint the frames, to determine
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* which frame is the target of a mouse event, and to determine what areas
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* need to be repainted when scrolling. The display lists built for each task
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* may be different for efficiency; in particular some frames need special
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* display list items only for event handling, and do not create these items
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* when the display list will be used for painting (the common case). For
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* example, when painting we avoid creating nsDisplayBackground items for
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* frames that don't display a visible background, but for event handling
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* we need those backgrounds because they are not transparent to events.
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*
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* We could avoid constructing an explicit display list by traversing the
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* frame tree multiple times in clever ways. However, reifying the display list
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* reduces code complexity and reduces the number of times each frame must be
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* traversed to one, which seems to be good for performance. It also means
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* we can share code for painting, event handling and scroll analysis.
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*
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* Display lists are short-lived; content and frame trees cannot change
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* between a display list being created and destroyed. Display lists should
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* not be created during reflow because the frame tree may be in an
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* inconsistent state (e.g., a frame's stored overflow-area may not include
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* the bounds of all its children). However, it should be fine to create
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* a display list while a reflow is pending, before it starts.
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*
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* A display list covers the "extended" frame tree; the display list for a frame
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* tree containing FRAME/IFRAME elements can include frames from the subdocuments.
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*
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* Display item's coordinates are relative to their nearest reference frame ancestor.
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* Both the display root and any frame with a transform act as a reference frame
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* for their frame subtrees.
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*/
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// All types are defined in nsDisplayItemTypes.h
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#define NS_DISPLAY_DECL_NAME(n, e) \
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virtual const char* Name() override { return n; } \
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virtual Type GetType() override { return e; }
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/**
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* This manages a display list and is passed as a parameter to
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* nsIFrame::BuildDisplayList.
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* It contains the parameters that don't change from frame to frame and manages
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* the display list memory using a PLArena. It also establishes the reference
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* coordinate system for all display list items. Some of the parameters are
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* available from the prescontext/presshell, but we copy them into the builder
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* for faster/more convenient access.
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*/
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class nsDisplayListBuilder {
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public:
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typedef mozilla::FramePropertyDescriptor FramePropertyDescriptor;
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typedef mozilla::FrameLayerBuilder FrameLayerBuilder;
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typedef mozilla::DisplayItemClip DisplayItemClip;
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typedef mozilla::DisplayListClipState DisplayListClipState;
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typedef nsIWidget::ThemeGeometry ThemeGeometry;
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typedef mozilla::layers::Layer Layer;
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typedef mozilla::layers::FrameMetrics FrameMetrics;
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typedef mozilla::layers::FrameMetrics::ViewID ViewID;
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/**
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* @param aReferenceFrame the frame at the root of the subtree; its origin
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* is the origin of the reference coordinate system for this display list
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* @param aMode encodes what the builder is being used for.
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* @param aBuildCaret whether or not we should include the caret in any
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* display lists that we make.
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*/
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enum Mode {
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PAINTING,
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EVENT_DELIVERY,
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PLUGIN_GEOMETRY,
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IMAGE_VISIBILITY,
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OTHER
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};
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nsDisplayListBuilder(nsIFrame* aReferenceFrame, Mode aMode, bool aBuildCaret);
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~nsDisplayListBuilder();
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void SetWillComputePluginGeometry(bool aWillComputePluginGeometry)
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{
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mWillComputePluginGeometry = aWillComputePluginGeometry;
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}
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void SetForPluginGeometry()
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{
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NS_ASSERTION(mMode == PAINTING, "Can only switch from PAINTING to PLUGIN_GEOMETRY");
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NS_ASSERTION(mWillComputePluginGeometry, "Should have signalled this in advance");
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mMode = PLUGIN_GEOMETRY;
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}
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/**
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* @return true if the display is being built in order to determine which
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* frame is under the mouse position.
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*/
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bool IsForEventDelivery() { return mMode == EVENT_DELIVERY; }
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/**
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* Be careful with this. The display list will be built in PAINTING mode
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* first and then switched to PLUGIN_GEOMETRY before a second call to
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* ComputeVisibility.
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* @return true if the display list is being built to compute geometry
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* for plugins.
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*/
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bool IsForPluginGeometry() { return mMode == PLUGIN_GEOMETRY; }
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/**
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* @return true if the display list is being built for painting.
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*/
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bool IsForPainting() { return mMode == PAINTING; }
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/**
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* @return true if the display list is being built for determining image
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* visibility.
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*/
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bool IsForImageVisibility() { return mMode == IMAGE_VISIBILITY; }
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bool WillComputePluginGeometry() { return mWillComputePluginGeometry; }
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/**
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* @return true if "painting is suppressed" during page load and we
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* should paint only the background of the document.
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*/
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bool IsBackgroundOnly() {
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NS_ASSERTION(mPresShellStates.Length() > 0,
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"don't call this if we're not in a presshell");
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return CurrentPresShellState()->mIsBackgroundOnly;
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}
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/**
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* @return true if the currently active BuildDisplayList call is being
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* applied to a frame at the root of a pseudo stacking context. A pseudo
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* stacking context is either a real stacking context or basically what
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* CSS2.1 appendix E refers to with "treat the element as if it created
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* a new stacking context
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*/
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bool IsAtRootOfPseudoStackingContext() { return mIsAtRootOfPseudoStackingContext; }
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/**
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* @return the selection that painting should be restricted to (or nullptr
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* in the normal unrestricted case)
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*/
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nsISelection* GetBoundingSelection() { return mBoundingSelection; }
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/**
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* @return the root of given frame's (sub)tree, whose origin
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* establishes the coordinate system for the child display items.
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*/
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const nsIFrame* FindReferenceFrameFor(const nsIFrame *aFrame,
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nsPoint* aOffset = nullptr);
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/**
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* Returns whether a frame acts as an animated geometry root, optionally
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* returning the next ancestor to check.
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*/
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bool IsAnimatedGeometryRoot(nsIFrame* aFrame, nsIFrame** aParent = nullptr);
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/**
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* Returns the nearest ancestor frame to aFrame that is considered to have
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* (or will have) animated geometry. This can return aFrame.
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*/
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nsIFrame* FindAnimatedGeometryRootFor(nsIFrame* aFrame, const nsIFrame* aStopAtAncestor = nullptr);
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/**
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* @return the root of the display list's frame (sub)tree, whose origin
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* establishes the coordinate system for the display list
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*/
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nsIFrame* RootReferenceFrame()
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{
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return mReferenceFrame;
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}
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/**
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* @return a point pt such that adding pt to a coordinate relative to aFrame
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* makes it relative to ReferenceFrame(), i.e., returns
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* aFrame->GetOffsetToCrossDoc(ReferenceFrame()). The returned point is in
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* the appunits of aFrame.
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*/
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const nsPoint ToReferenceFrame(const nsIFrame* aFrame) {
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nsPoint result;
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FindReferenceFrameFor(aFrame, &result);
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return result;
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}
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/**
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* When building the display list, the scrollframe aFrame will be "ignored"
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* for the purposes of clipping, and its scrollbars will be hidden. We use
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* this to allow RenderOffscreen to render a whole document without beign
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* clipped by the viewport or drawing the viewport scrollbars.
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*/
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void SetIgnoreScrollFrame(nsIFrame* aFrame) { mIgnoreScrollFrame = aFrame; }
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/**
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* Get the scrollframe to ignore, if any.
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*/
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nsIFrame* GetIgnoreScrollFrame() { return mIgnoreScrollFrame; }
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/**
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* Get the ViewID of the nearest scrolling ancestor frame.
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*/
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ViewID GetCurrentScrollParentId() const { return mCurrentScrollParentId; }
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/**
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* Get and set the flag that indicates if scroll parents should have layers
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* forcibly created. This flag is set when a deeply nested scrollframe has
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* a displayport, and for scroll handoff to work properly the ancestor
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* scrollframes should also get their own scrollable layers.
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*/
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void ForceLayerForScrollParent() { mForceLayerForScrollParent = true; }
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/**
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* Get the ViewID and the scrollbar flags corresponding to the scrollbar for
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* which we are building display items at the moment.
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*/
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void GetScrollbarInfo(ViewID* aOutScrollbarTarget, uint32_t* aOutScrollbarFlags)
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{
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*aOutScrollbarTarget = mCurrentScrollbarTarget;
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*aOutScrollbarFlags = mCurrentScrollbarFlags;
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}
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/**
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* Calling this setter makes us include all out-of-flow descendant
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* frames in the display list, wherever they may be positioned (even
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* outside the dirty rects).
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*/
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void SetIncludeAllOutOfFlows() { mIncludeAllOutOfFlows = true; }
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bool GetIncludeAllOutOfFlows() const { return mIncludeAllOutOfFlows; }
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/**
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* Calling this setter makes us exclude all leaf frames that aren't
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* selected.
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*/
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void SetSelectedFramesOnly() { mSelectedFramesOnly = true; }
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bool GetSelectedFramesOnly() { return mSelectedFramesOnly; }
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/**
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* Calling this setter makes us compute accurate visible regions at the cost
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* of performance if regions get very complex.
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*/
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void SetAccurateVisibleRegions() { mAccurateVisibleRegions = true; }
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bool GetAccurateVisibleRegions() { return mAccurateVisibleRegions; }
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/**
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* @return Returns true if we should include the caret in any display lists
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* that we make.
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*/
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bool IsBuildingCaret() { return mBuildCaret; }
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/**
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* Allows callers to selectively override the regular paint suppression checks,
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* so that methods like GetFrameForPoint work when painting is suppressed.
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*/
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void IgnorePaintSuppression() { mIgnoreSuppression = true; }
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/**
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* @return Returns if this builder will ignore paint suppression.
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*/
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bool IsIgnoringPaintSuppression() { return mIgnoreSuppression; }
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/**
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* @return Returns if this builder had to ignore painting suppression on some
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* document when building the display list.
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*/
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bool GetHadToIgnorePaintSuppression() { return mHadToIgnoreSuppression; }
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/**
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* Call this if we're doing normal painting to the window.
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*/
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void SetPaintingToWindow(bool aToWindow) { mIsPaintingToWindow = aToWindow; }
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bool IsPaintingToWindow() const { return mIsPaintingToWindow; }
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/**
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* Call this to prevent descending into subdocuments.
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*/
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void SetDescendIntoSubdocuments(bool aDescend) { mDescendIntoSubdocuments = aDescend; }
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bool GetDescendIntoSubdocuments() { return mDescendIntoSubdocuments; }
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/**
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* Get dirty rect relative to current frame (the frame that we're calling
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* BuildDisplayList on right now).
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*/
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const nsRect& GetDirtyRect() { return mDirtyRect; }
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const nsIFrame* GetCurrentFrame() { return mCurrentFrame; }
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const nsIFrame* GetCurrentReferenceFrame() { return mCurrentReferenceFrame; }
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const nsPoint& GetCurrentFrameOffsetToReferenceFrame() { return mCurrentOffsetToReferenceFrame; }
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const nsIFrame* GetCurrentAnimatedGeometryRoot() {
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return mCurrentAnimatedGeometryRoot;
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}
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void RecomputeCurrentAnimatedGeometryRoot();
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/**
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* Returns true if merging and flattening of display lists should be
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* performed while computing visibility.
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*/
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bool AllowMergingAndFlattening() { return mAllowMergingAndFlattening; }
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void SetAllowMergingAndFlattening(bool aAllow) { mAllowMergingAndFlattening = aAllow; }
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nsDisplayLayerEventRegions* GetLayerEventRegions() { return mLayerEventRegions; }
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void SetLayerEventRegions(nsDisplayLayerEventRegions* aItem)
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{
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mLayerEventRegions = aItem;
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}
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bool IsBuildingLayerEventRegions()
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{
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if (mMode == PAINTING) {
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// Note: this is the only place that gets to query LayoutEventRegionsEnabled
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// 'directly' - other code should call this function.
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return gfxPrefs::LayoutEventRegionsEnabledDoNotUseDirectly() ||
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mAsyncPanZoomEnabled;
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}
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return false;
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}
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bool IsInsidePointerEventsNoneDoc()
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{
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return CurrentPresShellState()->mInsidePointerEventsNoneDoc;
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}
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bool GetAncestorHasApzAwareEventHandler() { return mAncestorHasApzAwareEventHandler; }
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void SetAncestorHasApzAwareEventHandler(bool aValue)
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{
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mAncestorHasApzAwareEventHandler = aValue;
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}
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bool HaveScrollableDisplayPort() const { return mHaveScrollableDisplayPort; }
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void SetHaveScrollableDisplayPort() { mHaveScrollableDisplayPort = true; }
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bool SetIsCompositingCheap(bool aCompositingCheap) {
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bool temp = mIsCompositingCheap;
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mIsCompositingCheap = aCompositingCheap;
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return temp;
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}
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bool IsCompositingCheap() const { return mIsCompositingCheap; }
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/**
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* Display the caret if needed.
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*/
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void DisplayCaret(nsIFrame* aFrame, const nsRect& aDirtyRect,
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nsDisplayList* aList) {
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nsIFrame* frame = GetCaretFrame();
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if (aFrame == frame) {
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frame->DisplayCaret(this, aDirtyRect, aList);
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}
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}
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/**
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* Get the frame that the caret is supposed to draw in.
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* If the caret is currently invisible, this will be null.
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*/
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nsIFrame* GetCaretFrame() {
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return CurrentPresShellState()->mCaretFrame;
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}
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/**
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* Get the rectangle we're supposed to draw the caret into.
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*/
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const nsRect& GetCaretRect() {
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return CurrentPresShellState()->mCaretRect;
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}
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/**
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* Get the caret associated with the current presshell.
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*/
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nsCaret* GetCaret();
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/**
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* Notify the display list builder that we're entering a presshell.
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* aReferenceFrame should be a frame in the new presshell.
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* aPointerEventsNoneDoc should be set to true if the frame generating this
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* document is pointer-events:none without mozpasspointerevents.
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*/
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void EnterPresShell(nsIFrame* aReferenceFrame,
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bool aPointerEventsNoneDoc = false);
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/**
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* For print-preview documents, we sometimes need to build display items for
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* the same frames multiple times in the same presentation, with different
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* clipping. Between each such batch of items, call
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* ResetMarkedFramesForDisplayList to make sure that the results of
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* MarkFramesForDisplayList do not carry over between batches.
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*/
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void ResetMarkedFramesForDisplayList();
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/**
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* Notify the display list builder that we're leaving a presshell.
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*/
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void LeavePresShell(nsIFrame* aReferenceFrame);
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/**
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* Returns true if we're currently building a display list that's
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* directly or indirectly under an nsDisplayTransform.
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*/
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bool IsInTransform() const { return mInTransform; }
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/**
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* Indicate whether or not we're directly or indirectly under and
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* nsDisplayTransform or SVG foreignObject.
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*/
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void SetInTransform(bool aInTransform) { mInTransform = aInTransform; }
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/**
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* Return true if we're currently building a display list for a
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* nested presshell.
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*/
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bool IsInSubdocument() { return mPresShellStates.Length() > 1; }
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/**
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* Return true if we're currently building a display list for the root
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* presshell which is the presshell of a chrome document, or if we're
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* building the display list for a popup and have not entered a subdocument
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* inside that popup.
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*/
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bool IsInRootChromeDocumentOrPopup() {
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return (mIsInChromePresContext || mIsBuildingForPopup) && !IsInSubdocument();
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}
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/**
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* @return true if images have been set to decode synchronously.
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*/
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bool ShouldSyncDecodeImages() { return mSyncDecodeImages; }
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/**
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* Indicates whether we should synchronously decode images. If true, we decode
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* and draw whatever image data has been loaded. If false, we just draw
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* whatever has already been decoded.
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*/
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void SetSyncDecodeImages(bool aSyncDecodeImages) {
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mSyncDecodeImages = aSyncDecodeImages;
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}
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/**
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* Helper method to generate background painting flags based on the
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* information available in the display list builder. Currently only
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* accounts for mSyncDecodeImages.
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*/
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uint32_t GetBackgroundPaintFlags();
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/**
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* Subtracts aRegion from *aVisibleRegion. We avoid letting
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* aVisibleRegion become overcomplex by simplifying it if necessary ---
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* unless mAccurateVisibleRegions is set, in which case we let it
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* get arbitrarily complex.
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*/
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void SubtractFromVisibleRegion(nsRegion* aVisibleRegion,
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const nsRegion& aRegion);
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/**
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* Mark the frames in aFrames to be displayed if they intersect aDirtyRect
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* (which is relative to aDirtyFrame). If the frames have placeholders
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* that might not be displayed, we mark the placeholders and their ancestors
|
|
* to ensure that display list construction descends into them
|
|
* anyway. nsDisplayListBuilder will take care of unmarking them when it is
|
|
* destroyed.
|
|
*/
|
|
void MarkFramesForDisplayList(nsIFrame* aDirtyFrame,
|
|
const nsFrameList& aFrames,
|
|
const nsRect& aDirtyRect);
|
|
/**
|
|
* Mark all child frames that Preserve3D() as needing display.
|
|
* Because these frames include transforms set on their parent, dirty rects
|
|
* for intermediate frames may be empty, yet child frames could still be visible.
|
|
*/
|
|
void MarkPreserve3DFramesForDisplayList(nsIFrame* aDirtyFrame, const nsRect& aDirtyRect);
|
|
|
|
const nsTArray<ThemeGeometry>& GetThemeGeometries() { return mThemeGeometries; }
|
|
|
|
/**
|
|
* Returns true if we need to descend into this frame when building
|
|
* the display list, even though it doesn't intersect the dirty
|
|
* rect, because it may have out-of-flows that do so.
|
|
*/
|
|
bool ShouldDescendIntoFrame(nsIFrame* aFrame) const {
|
|
return
|
|
(aFrame->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) ||
|
|
GetIncludeAllOutOfFlows();
|
|
}
|
|
|
|
/**
|
|
* Notifies the builder that a particular themed widget exists
|
|
* at the given rectangle within the currently built display list.
|
|
* For certain appearance values (currently only
|
|
* NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR, NS_THEME_TOOLBAR and
|
|
* NS_THEME_WINDOW_TITLEBAR) this gets called during every display list
|
|
* construction, for every themed widget of the right type within the
|
|
* display list, except for themed widgets which are transformed or have
|
|
* effects applied to them (e.g. CSS opacity or filters).
|
|
*
|
|
* @param aWidgetType the -moz-appearance value for the themed widget
|
|
* @param aRect the device-pixel rect relative to the widget's displayRoot
|
|
* for the themed widget
|
|
*/
|
|
void RegisterThemeGeometry(uint8_t aWidgetType,
|
|
const nsIntRect& aRect) {
|
|
if (mIsPaintingToWindow) {
|
|
mThemeGeometries.AppendElement(ThemeGeometry(aWidgetType, aRect));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Adjusts mWindowDraggingRegion to take into account aFrame. If aFrame's
|
|
* -moz-window-dragging value is |drag|, its border box is added to the
|
|
* collected dragging region; if the value is |no-drag|, the border box is
|
|
* subtracted from the region.
|
|
*/
|
|
void AdjustWindowDraggingRegion(nsIFrame* aFrame);
|
|
|
|
const nsIntRegion& GetWindowDraggingRegion() { return mWindowDraggingRegion; }
|
|
|
|
/**
|
|
* Allocate memory in our arena. It will only be freed when this display list
|
|
* builder is destroyed. This memory holds nsDisplayItems. nsDisplayItem
|
|
* destructors are called as soon as the item is no longer used.
|
|
*/
|
|
void* Allocate(size_t aSize);
|
|
|
|
/**
|
|
* Allocate a new DisplayListClip in the arena. Will be cleaned up
|
|
* automatically when the arena goes away.
|
|
*/
|
|
const DisplayItemClip* AllocateDisplayItemClip(const DisplayItemClip& aOriginal);
|
|
|
|
/**
|
|
* Transfer off main thread animations to the layer. May be called
|
|
* with aBuilder and aItem both null, but only if the caller has
|
|
* already checked that off main thread animations should be sent to
|
|
* the layer. When they are both null, the animations are added to
|
|
* the layer as pending animations.
|
|
*/
|
|
static void AddAnimationsAndTransitionsToLayer(Layer* aLayer,
|
|
nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem,
|
|
nsIFrame* aFrame,
|
|
nsCSSProperty aProperty);
|
|
/**
|
|
* A helper class to temporarily set the value of
|
|
* mIsAtRootOfPseudoStackingContext, and temporarily
|
|
* set mCurrentFrame and related state. Also temporarily sets mDirtyRect.
|
|
* aDirtyRect is relative to aForChild.
|
|
*/
|
|
class AutoBuildingDisplayList;
|
|
friend class AutoBuildingDisplayList;
|
|
class AutoBuildingDisplayList {
|
|
public:
|
|
AutoBuildingDisplayList(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aForChild,
|
|
const nsRect& aDirtyRect, bool aIsRoot)
|
|
: mBuilder(aBuilder),
|
|
mPrevFrame(aBuilder->mCurrentFrame),
|
|
mPrevReferenceFrame(aBuilder->mCurrentReferenceFrame),
|
|
mPrevAnimatedGeometryRoot(mBuilder->mCurrentAnimatedGeometryRoot),
|
|
mPrevLayerEventRegions(aBuilder->mLayerEventRegions),
|
|
mPrevOffset(aBuilder->mCurrentOffsetToReferenceFrame),
|
|
mPrevDirtyRect(aBuilder->mDirtyRect),
|
|
mPrevIsAtRootOfPseudoStackingContext(aBuilder->mIsAtRootOfPseudoStackingContext),
|
|
mPrevAncestorHasApzAwareEventHandler(aBuilder->mAncestorHasApzAwareEventHandler)
|
|
{
|
|
if (aForChild->IsTransformed()) {
|
|
aBuilder->mCurrentOffsetToReferenceFrame = nsPoint();
|
|
aBuilder->mCurrentReferenceFrame = aForChild;
|
|
} else if (aBuilder->mCurrentFrame == aForChild->GetParent()) {
|
|
aBuilder->mCurrentOffsetToReferenceFrame += aForChild->GetPosition();
|
|
} else {
|
|
aBuilder->mCurrentReferenceFrame =
|
|
aBuilder->FindReferenceFrameFor(aForChild,
|
|
&aBuilder->mCurrentOffsetToReferenceFrame);
|
|
}
|
|
if (aBuilder->mCurrentFrame == aForChild->GetParent()) {
|
|
if (aBuilder->IsAnimatedGeometryRoot(aForChild)) {
|
|
aBuilder->mCurrentAnimatedGeometryRoot = aForChild;
|
|
}
|
|
} else {
|
|
// Stop at the previous animated geometry root to help cases that
|
|
// aren't immediate descendents.
|
|
aBuilder->mCurrentAnimatedGeometryRoot =
|
|
aBuilder->FindAnimatedGeometryRootFor(aForChild, aBuilder->mCurrentAnimatedGeometryRoot);
|
|
}
|
|
aBuilder->mCurrentFrame = aForChild;
|
|
aBuilder->mDirtyRect = aDirtyRect;
|
|
aBuilder->mIsAtRootOfPseudoStackingContext = aIsRoot;
|
|
}
|
|
void SetDirtyRect(const nsRect& aRect) {
|
|
mBuilder->mDirtyRect = aRect;
|
|
}
|
|
void SetReferenceFrameAndCurrentOffset(const nsIFrame* aFrame, const nsPoint& aOffset) {
|
|
mBuilder->mCurrentReferenceFrame = aFrame;
|
|
mBuilder->mCurrentOffsetToReferenceFrame = aOffset;
|
|
}
|
|
// Return the previous frame's animated geometry root, whether or not the
|
|
// current frame is an immediate descendant.
|
|
const nsIFrame* GetPrevAnimatedGeometryRoot() const {
|
|
return mPrevAnimatedGeometryRoot;
|
|
}
|
|
~AutoBuildingDisplayList() {
|
|
mBuilder->mCurrentFrame = mPrevFrame;
|
|
mBuilder->mCurrentReferenceFrame = mPrevReferenceFrame;
|
|
mBuilder->mLayerEventRegions = mPrevLayerEventRegions;
|
|
mBuilder->mCurrentOffsetToReferenceFrame = mPrevOffset;
|
|
mBuilder->mDirtyRect = mPrevDirtyRect;
|
|
mBuilder->mIsAtRootOfPseudoStackingContext = mPrevIsAtRootOfPseudoStackingContext;
|
|
mBuilder->mAncestorHasApzAwareEventHandler = mPrevAncestorHasApzAwareEventHandler;
|
|
mBuilder->mCurrentAnimatedGeometryRoot = mPrevAnimatedGeometryRoot;
|
|
}
|
|
private:
|
|
nsDisplayListBuilder* mBuilder;
|
|
const nsIFrame* mPrevFrame;
|
|
const nsIFrame* mPrevReferenceFrame;
|
|
nsIFrame* mPrevAnimatedGeometryRoot;
|
|
nsDisplayLayerEventRegions* mPrevLayerEventRegions;
|
|
nsPoint mPrevOffset;
|
|
nsRect mPrevDirtyRect;
|
|
bool mPrevIsAtRootOfPseudoStackingContext;
|
|
bool mPrevAncestorHasApzAwareEventHandler;
|
|
};
|
|
|
|
/**
|
|
* A helper class to temporarily set the value of mInTransform.
|
|
*/
|
|
class AutoInTransformSetter;
|
|
friend class AutoInTransformSetter;
|
|
class AutoInTransformSetter {
|
|
public:
|
|
AutoInTransformSetter(nsDisplayListBuilder* aBuilder, bool aInTransform)
|
|
: mBuilder(aBuilder), mOldValue(aBuilder->mInTransform) {
|
|
aBuilder->mInTransform = aInTransform;
|
|
}
|
|
~AutoInTransformSetter() {
|
|
mBuilder->mInTransform = mOldValue;
|
|
}
|
|
private:
|
|
nsDisplayListBuilder* mBuilder;
|
|
bool mOldValue;
|
|
};
|
|
|
|
/**
|
|
* A helper class to temporarily set the value of mCurrentScrollParentId.
|
|
*/
|
|
class AutoCurrentScrollParentIdSetter;
|
|
friend class AutoCurrentScrollParentIdSetter;
|
|
class AutoCurrentScrollParentIdSetter {
|
|
public:
|
|
AutoCurrentScrollParentIdSetter(nsDisplayListBuilder* aBuilder, ViewID aScrollId)
|
|
: mBuilder(aBuilder)
|
|
, mOldValue(aBuilder->mCurrentScrollParentId)
|
|
, mOldForceLayer(aBuilder->mForceLayerForScrollParent) {
|
|
// If this AutoCurrentScrollParentIdSetter has the same scrollId as the
|
|
// previous one on the stack, then that means the scrollframe that
|
|
// created this isn't actually scrollable and cannot participate in
|
|
// scroll handoff. We set mCanBeScrollParent to false to indicate this.
|
|
mCanBeScrollParent = (mOldValue != aScrollId);
|
|
aBuilder->mCurrentScrollParentId = aScrollId;
|
|
aBuilder->mForceLayerForScrollParent = false;
|
|
}
|
|
bool ShouldForceLayerForScrollParent() const {
|
|
// Only scrollframes participating in scroll handoff can be forced to
|
|
// layerize
|
|
return mCanBeScrollParent && mBuilder->mForceLayerForScrollParent;
|
|
};
|
|
~AutoCurrentScrollParentIdSetter() {
|
|
mBuilder->mCurrentScrollParentId = mOldValue;
|
|
if (mCanBeScrollParent) {
|
|
// If this flag is set, caller code is responsible for having dealt
|
|
// with the current value of mBuilder->mForceLayerForScrollParent, so
|
|
// we can just restore the old value.
|
|
mBuilder->mForceLayerForScrollParent = mOldForceLayer;
|
|
} else {
|
|
// Otherwise we need to keep propagating the force-layerization flag
|
|
// upwards to the next ancestor scrollframe that does participate in
|
|
// scroll handoff.
|
|
mBuilder->mForceLayerForScrollParent |= mOldForceLayer;
|
|
}
|
|
}
|
|
private:
|
|
nsDisplayListBuilder* mBuilder;
|
|
ViewID mOldValue;
|
|
bool mOldForceLayer;
|
|
bool mCanBeScrollParent;
|
|
};
|
|
|
|
/**
|
|
* A helper class to temporarily set the value of mCurrentScrollbarTarget
|
|
* and mCurrentScrollbarFlags.
|
|
*/
|
|
class AutoCurrentScrollbarInfoSetter;
|
|
friend class AutoCurrentScrollbarInfoSetter;
|
|
class AutoCurrentScrollbarInfoSetter {
|
|
public:
|
|
AutoCurrentScrollbarInfoSetter(nsDisplayListBuilder* aBuilder, ViewID aScrollTargetID,
|
|
uint32_t aScrollbarFlags)
|
|
: mBuilder(aBuilder) {
|
|
aBuilder->mCurrentScrollbarTarget = aScrollTargetID;
|
|
aBuilder->mCurrentScrollbarFlags = aScrollbarFlags;
|
|
}
|
|
~AutoCurrentScrollbarInfoSetter() {
|
|
// No need to restore old values because scrollbars cannot be nested.
|
|
mBuilder->mCurrentScrollbarTarget = FrameMetrics::NULL_SCROLL_ID;
|
|
mBuilder->mCurrentScrollbarFlags = 0;
|
|
}
|
|
private:
|
|
nsDisplayListBuilder* mBuilder;
|
|
};
|
|
|
|
// Helpers for tables
|
|
nsDisplayTableItem* GetCurrentTableItem() { return mCurrentTableItem; }
|
|
void SetCurrentTableItem(nsDisplayTableItem* aTableItem) { mCurrentTableItem = aTableItem; }
|
|
|
|
struct OutOfFlowDisplayData {
|
|
OutOfFlowDisplayData(const DisplayItemClip& aContainingBlockClip,
|
|
const nsRect &aDirtyRect)
|
|
: mContainingBlockClip(aContainingBlockClip)
|
|
, mDirtyRect(aDirtyRect)
|
|
{}
|
|
explicit OutOfFlowDisplayData(const nsRect &aDirtyRect)
|
|
: mDirtyRect(aDirtyRect)
|
|
{}
|
|
DisplayItemClip mContainingBlockClip;
|
|
nsRect mDirtyRect;
|
|
};
|
|
|
|
NS_DECLARE_FRAME_PROPERTY(OutOfFlowDisplayDataProperty,
|
|
DeleteValue<OutOfFlowDisplayData>)
|
|
NS_DECLARE_FRAME_PROPERTY(Preserve3DDirtyRectProperty, DeleteValue<nsRect>)
|
|
|
|
nsPresContext* CurrentPresContext() {
|
|
return CurrentPresShellState()->mPresShell->GetPresContext();
|
|
}
|
|
|
|
/**
|
|
* Accumulates the bounds of box frames that have moz-appearance
|
|
* -moz-win-exclude-glass style. Used in setting glass margins on
|
|
* Windows.
|
|
*
|
|
* We set the window opaque region (from which glass margins are computed)
|
|
* to the intersection of the glass region specified here and the opaque
|
|
* region computed during painting. So the excluded glass region actually
|
|
* *limits* the extent of the opaque area reported to Windows. We limit it
|
|
* so that changes to the computed opaque region (which can vary based on
|
|
* region optimizations and the placement of UI elements) outside the
|
|
* -moz-win-exclude-glass area don't affect the glass margins reported to
|
|
* Windows; changing those margins willy-nilly can cause the Windows 7 glass
|
|
* haze effect to jump around disconcertingly.
|
|
*/
|
|
void AddWindowExcludeGlassRegion(const nsRegion& bounds) {
|
|
mWindowExcludeGlassRegion.Or(mWindowExcludeGlassRegion, bounds);
|
|
}
|
|
const nsRegion& GetWindowExcludeGlassRegion() {
|
|
return mWindowExcludeGlassRegion;
|
|
}
|
|
/**
|
|
* Accumulates opaque stuff into the window opaque region.
|
|
*/
|
|
void AddWindowOpaqueRegion(const nsRegion& bounds) {
|
|
mWindowOpaqueRegion.Or(mWindowOpaqueRegion, bounds);
|
|
}
|
|
/**
|
|
* Returns the window opaque region built so far. This may be incomplete
|
|
* since the opaque region is built during layer construction.
|
|
*/
|
|
const nsRegion& GetWindowOpaqueRegion() {
|
|
return mWindowOpaqueRegion;
|
|
}
|
|
void SetGlassDisplayItem(nsDisplayItem* aItem) {
|
|
if (mGlassDisplayItem) {
|
|
// Web pages or extensions could trigger this by using
|
|
// -moz-appearance:win-borderless-glass etc on their own elements.
|
|
// Keep the first one, since that will be the background of the root
|
|
// window
|
|
NS_WARNING("Multiple glass backgrounds found?");
|
|
} else {
|
|
mGlassDisplayItem = aItem;
|
|
}
|
|
}
|
|
bool NeedToForceTransparentSurfaceForItem(nsDisplayItem* aItem);
|
|
|
|
void SetContainsPluginItem() { mContainsPluginItem = true; }
|
|
bool ContainsPluginItem() { return mContainsPluginItem; }
|
|
|
|
/**
|
|
* mContainsBlendMode is true if we processed a display item that
|
|
* has a blend mode attached. We do this so we can insert a
|
|
* nsDisplayBlendContainer in the parent stacking context.
|
|
*/
|
|
void SetContainsBlendMode(uint8_t aBlendMode);
|
|
void SetContainsBlendModes(const BlendModeSet& aModes) {
|
|
mContainedBlendModes = aModes;
|
|
}
|
|
bool ContainsBlendMode() const { return !mContainedBlendModes.isEmpty(); }
|
|
BlendModeSet& ContainedBlendModes() {
|
|
return mContainedBlendModes;
|
|
}
|
|
|
|
DisplayListClipState& ClipState() { return mClipState; }
|
|
|
|
/**
|
|
* Add the current frame to the will-change budget if possible and
|
|
* remeber the outcome. Subsequent calls to IsInWillChangeBudget
|
|
* will return the same value as return here.
|
|
*/
|
|
bool AddToWillChangeBudget(nsIFrame* aFrame, const nsSize& aSize);
|
|
|
|
/**
|
|
* This will add the current frame to the will-change budget the first
|
|
* time it is seen. On subsequent calls this will return the same
|
|
* answer. This effectively implements a first-come, first-served
|
|
* allocation of the will-change budget.
|
|
*/
|
|
bool IsInWillChangeBudget(nsIFrame* aFrame, const nsSize& aSize);
|
|
|
|
/**
|
|
* Look up the cached animated geometry root for aFrame subject to
|
|
* aStopAtAncestor. Store the nsIFrame* result into *aOutResult, and return
|
|
* true if the cache was hit. Return false if the cache was not hit.
|
|
*/
|
|
bool GetCachedAnimatedGeometryRoot(const nsIFrame* aFrame,
|
|
const nsIFrame* aStopAtAncestor,
|
|
nsIFrame** aOutResult);
|
|
|
|
void EnterSVGEffectsContents(nsDisplayList* aHoistedItemsStorage);
|
|
void ExitSVGEffectsContents();
|
|
|
|
bool ShouldBuildScrollInfoItemsForHoisting() const
|
|
{ return mSVGEffectsBuildingDepth > 0; }
|
|
|
|
void AppendNewScrollInfoItemForHoisting(nsDisplayScrollInfoLayer* aScrollInfoItem);
|
|
|
|
/**
|
|
* Store the dirty rect of the scrolled contents of aScrollableFrame. This
|
|
* is a bound for the extents of the new visible region of the scrolled
|
|
* layer.
|
|
* @param aScrollableFrame the scrollable frame
|
|
* @param aDirty the dirty rect, relative to aScrollableFrame
|
|
*/
|
|
void StoreDirtyRectForScrolledContents(const nsIFrame* aScrollableFrame, const nsRect& aDirty);
|
|
|
|
/**
|
|
* Retrieve the stored dirty rect for the scrolled contents of aScrollableFrame.
|
|
* @param aScrollableFrame the scroll frame
|
|
* @return the dirty rect, relative to aScrollableFrame's *reference frame*
|
|
*/
|
|
nsRect GetDirtyRectForScrolledContents(const nsIFrame* aScrollableFrame) const;
|
|
|
|
private:
|
|
void MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame, nsIFrame* aFrame,
|
|
const nsRect& aDirtyRect);
|
|
|
|
struct PresShellState {
|
|
nsIPresShell* mPresShell;
|
|
nsIFrame* mCaretFrame;
|
|
nsRect mCaretRect;
|
|
uint32_t mFirstFrameMarkedForDisplay;
|
|
bool mIsBackgroundOnly;
|
|
// This is a per-document flag turning off event handling for all content
|
|
// in the document, and is set when we enter a subdocument for a pointer-
|
|
// events:none frame that doesn't have mozpasspointerevents set.
|
|
bool mInsidePointerEventsNoneDoc;
|
|
};
|
|
|
|
PresShellState* CurrentPresShellState() {
|
|
NS_ASSERTION(mPresShellStates.Length() > 0,
|
|
"Someone forgot to enter a presshell");
|
|
return &mPresShellStates[mPresShellStates.Length() - 1];
|
|
}
|
|
|
|
struct DocumentWillChangeBudget {
|
|
DocumentWillChangeBudget()
|
|
: mBudget(0)
|
|
{}
|
|
|
|
uint32_t mBudget;
|
|
};
|
|
|
|
nsIFrame* mReferenceFrame;
|
|
nsIFrame* mIgnoreScrollFrame;
|
|
nsDisplayLayerEventRegions* mLayerEventRegions;
|
|
PLArenaPool mPool;
|
|
nsCOMPtr<nsISelection> mBoundingSelection;
|
|
nsAutoTArray<PresShellState,8> mPresShellStates;
|
|
nsAutoTArray<nsIFrame*,100> mFramesMarkedForDisplay;
|
|
nsAutoTArray<ThemeGeometry,2> mThemeGeometries;
|
|
nsDisplayTableItem* mCurrentTableItem;
|
|
DisplayListClipState mClipState;
|
|
// mCurrentFrame is the frame that we're currently calling (or about to call)
|
|
// BuildDisplayList on.
|
|
const nsIFrame* mCurrentFrame;
|
|
// The reference frame for mCurrentFrame.
|
|
const nsIFrame* mCurrentReferenceFrame;
|
|
// The offset from mCurrentFrame to mCurrentReferenceFrame.
|
|
nsPoint mCurrentOffsetToReferenceFrame;
|
|
// The animated geometry root for mCurrentFrame.
|
|
nsIFrame* mCurrentAnimatedGeometryRoot;
|
|
|
|
struct AnimatedGeometryRootLookup {
|
|
const nsIFrame* mFrame;
|
|
const nsIFrame* mStopAtFrame;
|
|
|
|
AnimatedGeometryRootLookup(const nsIFrame* aFrame, const nsIFrame* aStopAtFrame)
|
|
: mFrame(aFrame)
|
|
, mStopAtFrame(aStopAtFrame)
|
|
{
|
|
}
|
|
|
|
PLDHashNumber Hash() const {
|
|
return mozilla::HashBytes(this, sizeof(this));
|
|
}
|
|
|
|
bool operator==(const AnimatedGeometryRootLookup& aOther) const {
|
|
return mFrame == aOther.mFrame && mStopAtFrame == aOther.mStopAtFrame;
|
|
}
|
|
};
|
|
// Cache for storing animated geometry roots for arbitrary frames
|
|
nsDataHashtable<nsGenericHashKey<AnimatedGeometryRootLookup>, nsIFrame*>
|
|
mAnimatedGeometryRootCache;
|
|
// will-change budget tracker
|
|
nsDataHashtable<nsPtrHashKey<nsPresContext>, DocumentWillChangeBudget>
|
|
mWillChangeBudget;
|
|
|
|
// Any frame listed in this set is already counted in the budget
|
|
// and thus is in-budget.
|
|
nsTHashtable<nsPtrHashKey<nsIFrame> > mBudgetSet;
|
|
|
|
// rects are relative to the frame's reference frame
|
|
nsDataHashtable<nsPtrHashKey<nsIFrame>, nsRect> mDirtyRectForScrolledContents;
|
|
|
|
// Relative to mCurrentFrame.
|
|
nsRect mDirtyRect;
|
|
nsRegion mWindowExcludeGlassRegion;
|
|
nsRegion mWindowOpaqueRegion;
|
|
nsIntRegion mWindowDraggingRegion;
|
|
// The display item for the Windows window glass background, if any
|
|
nsDisplayItem* mGlassDisplayItem;
|
|
// A temporary list that we append scroll info items to while building
|
|
// display items for the contents of frames with SVG effects.
|
|
// Only non-null when ShouldBuildScrollInfoItemsForHoisting() is true.
|
|
// This is a pointer and not a real nsDisplayList value because the
|
|
// nsDisplayList class is defined below this class, so we can't use it here.
|
|
nsDisplayList* mScrollInfoItemsForHoisting;
|
|
nsTArray<DisplayItemClip*> mDisplayItemClipsToDestroy;
|
|
Mode mMode;
|
|
ViewID mCurrentScrollParentId;
|
|
ViewID mCurrentScrollbarTarget;
|
|
uint32_t mCurrentScrollbarFlags;
|
|
BlendModeSet mContainedBlendModes;
|
|
int32_t mSVGEffectsBuildingDepth;
|
|
bool mBuildCaret;
|
|
bool mIgnoreSuppression;
|
|
bool mHadToIgnoreSuppression;
|
|
bool mIsAtRootOfPseudoStackingContext;
|
|
bool mIncludeAllOutOfFlows;
|
|
bool mDescendIntoSubdocuments;
|
|
bool mSelectedFramesOnly;
|
|
bool mAccurateVisibleRegions;
|
|
bool mAllowMergingAndFlattening;
|
|
bool mWillComputePluginGeometry;
|
|
// True when we're building a display list that's directly or indirectly
|
|
// under an nsDisplayTransform
|
|
bool mInTransform;
|
|
bool mIsInChromePresContext;
|
|
bool mSyncDecodeImages;
|
|
bool mIsPaintingToWindow;
|
|
bool mIsCompositingCheap;
|
|
bool mContainsPluginItem;
|
|
bool mAncestorHasApzAwareEventHandler;
|
|
// True when the first async-scrollable scroll frame for which we build a
|
|
// display list has a display port. An async-scrollable scroll frame is one
|
|
// which WantsAsyncScroll().
|
|
bool mHaveScrollableDisplayPort;
|
|
bool mWindowDraggingAllowed;
|
|
bool mIsBuildingForPopup;
|
|
bool mForceLayerForScrollParent;
|
|
bool mAsyncPanZoomEnabled;
|
|
};
|
|
|
|
class nsDisplayItem;
|
|
class nsDisplayList;
|
|
/**
|
|
* nsDisplayItems are put in singly-linked lists rooted in an nsDisplayList.
|
|
* nsDisplayItemLink holds the link. The lists are linked from lowest to
|
|
* highest in z-order.
|
|
*/
|
|
class nsDisplayItemLink {
|
|
// This is never instantiated directly, so no need to count constructors and
|
|
// destructors.
|
|
protected:
|
|
nsDisplayItemLink() : mAbove(nullptr) {}
|
|
nsDisplayItem* mAbove;
|
|
|
|
friend class nsDisplayList;
|
|
};
|
|
|
|
/**
|
|
* This is the unit of rendering and event testing. Each instance of this
|
|
* class represents an entity that can be drawn on the screen, e.g., a
|
|
* frame's CSS background, or a frame's text string.
|
|
*
|
|
* nsDisplayListItems can be containers --- i.e., they can perform hit testing
|
|
* and painting by recursively traversing a list of child items.
|
|
*
|
|
* These are arena-allocated during display list construction. A typical
|
|
* subclass would just have a frame pointer, so its object would be just three
|
|
* pointers (vtable, next-item, frame).
|
|
*
|
|
* Display items belong to a list at all times (except temporarily as they
|
|
* move from one list to another).
|
|
*/
|
|
class nsDisplayItem : public nsDisplayItemLink {
|
|
public:
|
|
typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
|
|
typedef mozilla::DisplayItemClip DisplayItemClip;
|
|
typedef mozilla::layers::FrameMetrics FrameMetrics;
|
|
typedef mozilla::layers::FrameMetrics::ViewID ViewID;
|
|
typedef mozilla::layers::Layer Layer;
|
|
typedef mozilla::layers::LayerManager LayerManager;
|
|
typedef mozilla::LayerState LayerState;
|
|
|
|
// This is never instantiated directly (it has pure virtual methods), so no
|
|
// need to count constructors and destructors.
|
|
nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame);
|
|
/**
|
|
* This constructor is only used in rare cases when we need to construct
|
|
* temporary items.
|
|
*/
|
|
explicit nsDisplayItem(nsIFrame* aFrame)
|
|
: mFrame(aFrame)
|
|
, mClip(nullptr)
|
|
, mReferenceFrame(nullptr)
|
|
#ifdef MOZ_DUMP_PAINTING
|
|
, mPainted(false)
|
|
#endif
|
|
{
|
|
}
|
|
virtual ~nsDisplayItem() {}
|
|
|
|
void* operator new(size_t aSize,
|
|
nsDisplayListBuilder* aBuilder) CPP_THROW_NEW {
|
|
return aBuilder->Allocate(aSize);
|
|
}
|
|
|
|
// Contains all the type integers for each display list item type
|
|
#include "nsDisplayItemTypes.h"
|
|
|
|
struct HitTestState {
|
|
explicit HitTestState() {}
|
|
|
|
~HitTestState() {
|
|
NS_ASSERTION(mItemBuffer.Length() == 0,
|
|
"mItemBuffer should have been cleared");
|
|
}
|
|
|
|
nsAutoTArray<nsDisplayItem*, 100> mItemBuffer;
|
|
};
|
|
|
|
/**
|
|
* Some consecutive items should be rendered together as a unit, e.g.,
|
|
* outlines for the same element. For this, we need a way for items to
|
|
* identify their type. We use the type for other purposes too.
|
|
*/
|
|
virtual Type GetType() = 0;
|
|
/**
|
|
* Pairing this with the GetUnderlyingFrame() pointer gives a key that
|
|
* uniquely identifies this display item in the display item tree.
|
|
* XXX check nsOptionEventGrabberWrapper/nsXULEventRedirectorWrapper
|
|
*/
|
|
virtual uint32_t GetPerFrameKey() { return uint32_t(GetType()); }
|
|
/**
|
|
* This is called after we've constructed a display list for event handling.
|
|
* When this is called, we've already ensured that aRect intersects the
|
|
* item's bounds and that clipping has been taking into account.
|
|
*
|
|
* @param aRect the point or rect being tested, relative to the reference
|
|
* frame. If the width and height are both 1 app unit, it indicates we're
|
|
* hit testing a point, not a rect.
|
|
* @param aState must point to a HitTestState. If you don't have one,
|
|
* just create one with the default constructor and pass it in.
|
|
* @param aOutFrames each item appends the frame(s) in this display item that
|
|
* the rect is considered over (if any) to aOutFrames.
|
|
*/
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) {}
|
|
/**
|
|
* @return the frame that this display item is based on. This is used to sort
|
|
* items by z-index and content order and for some other uses. Never
|
|
* returns null.
|
|
*/
|
|
inline nsIFrame* Frame() const { return mFrame; }
|
|
/**
|
|
* Compute the used z-index of our frame; returns zero for elements to which
|
|
* z-index does not apply, and for z-index:auto.
|
|
* @note This can be overridden, @see nsDisplayWrapList::SetOverrideZIndex.
|
|
*/
|
|
virtual int32_t ZIndex() const;
|
|
/**
|
|
* The default bounds is the frame border rect.
|
|
* @param aSnap *aSnap is set to true if the returned rect will be
|
|
* snapped to nearest device pixel edges during actual drawing.
|
|
* It might be set to false and snap anyway, so code computing the set of
|
|
* pixels affected by this display item needs to round outwards to pixel
|
|
* boundaries when *aSnap is set to false.
|
|
* This does not take the item's clipping into account.
|
|
* @return a rectangle relative to aBuilder->ReferenceFrame() that
|
|
* contains the area drawn by this display item
|
|
*/
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
|
|
{
|
|
*aSnap = false;
|
|
return nsRect(ToReferenceFrame(), Frame()->GetSize());
|
|
}
|
|
/**
|
|
* Returns true if nothing will be rendered inside aRect, false if uncertain.
|
|
* aRect is assumed to be contained in this item's bounds.
|
|
*/
|
|
virtual bool IsInvisibleInRect(const nsRect& aRect)
|
|
{
|
|
return false;
|
|
}
|
|
/**
|
|
* Returns the result of GetBounds intersected with the item's clip.
|
|
* The intersection is approximate since rounded corners are not taking into
|
|
* account.
|
|
*/
|
|
nsRect GetClippedBounds(nsDisplayListBuilder* aBuilder);
|
|
nsRect GetBorderRect() {
|
|
return nsRect(ToReferenceFrame(), Frame()->GetSize());
|
|
}
|
|
nsRect GetPaddingRect() {
|
|
return Frame()->GetPaddingRectRelativeToSelf() + ToReferenceFrame();
|
|
}
|
|
nsRect GetContentRect() {
|
|
return Frame()->GetContentRectRelativeToSelf() + ToReferenceFrame();
|
|
}
|
|
|
|
/**
|
|
* Checks if the frame(s) owning this display item have been marked as invalid,
|
|
* and needing repainting.
|
|
*/
|
|
virtual bool IsInvalid(nsRect& aRect) {
|
|
bool result = mFrame ? mFrame->IsInvalid(aRect) : false;
|
|
aRect += ToReferenceFrame();
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates and initializes an nsDisplayItemGeometry object that retains the current
|
|
* areas covered by this display item. These need to retain enough information
|
|
* such that they can be compared against a future nsDisplayItem of the same type,
|
|
* and determine if repainting needs to happen.
|
|
*
|
|
* Subclasses wishing to store more information need to override both this
|
|
* and ComputeInvalidationRegion, as well as implementing an nsDisplayItemGeometry
|
|
* subclass.
|
|
*
|
|
* The default implementation tracks both the display item bounds, and the frame's
|
|
* border rect.
|
|
*/
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder)
|
|
{
|
|
return new nsDisplayItemGenericGeometry(this, aBuilder);
|
|
}
|
|
|
|
/**
|
|
* Compares an nsDisplayItemGeometry object from a previous paint against the
|
|
* current item. Computes if the geometry of the item has changed, and the
|
|
* invalidation area required for correct repainting.
|
|
*
|
|
* The existing geometry will have been created from a display item with a
|
|
* matching GetPerFrameKey()/mFrame pair to the current item.
|
|
*
|
|
* The default implementation compares the display item bounds, and the frame's
|
|
* border rect, and invalidates the entire bounds if either rect changes.
|
|
*
|
|
* @param aGeometry The geometry of the matching display item from the
|
|
* previous paint.
|
|
* @param aInvalidRegion Output param, the region to invalidate, or
|
|
* unchanged if none.
|
|
*/
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion)
|
|
{
|
|
const nsDisplayItemGenericGeometry* geometry = static_cast<const nsDisplayItemGenericGeometry*>(aGeometry);
|
|
bool snap;
|
|
if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) ||
|
|
!geometry->mBorderRect.IsEqualInterior(GetBorderRect())) {
|
|
aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* An alternative default implementation of ComputeInvalidationRegion,
|
|
* that instead invalidates only the changed area between the two items.
|
|
*/
|
|
void ComputeInvalidationRegionDifference(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemBoundsGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion)
|
|
{
|
|
bool snap;
|
|
nsRect bounds = GetBounds(aBuilder, &snap);
|
|
|
|
if (!aGeometry->mBounds.IsEqualInterior(bounds)) {
|
|
nscoord radii[8];
|
|
if (aGeometry->mHasRoundedCorners ||
|
|
Frame()->GetBorderRadii(radii)) {
|
|
aInvalidRegion->Or(aGeometry->mBounds, bounds);
|
|
} else {
|
|
aInvalidRegion->Xor(aGeometry->mBounds, bounds);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called when the area rendered by this display item has changed (been
|
|
* invalidated or changed geometry) since the last paint. This includes
|
|
* when the display item was not rendered at all in the last paint.
|
|
* It does NOT get called when a display item was being rendered and no
|
|
* longer is, because generally that means there is no display item to
|
|
* call this method on.
|
|
*/
|
|
virtual void NotifyRenderingChanged() {}
|
|
|
|
/**
|
|
* @param aSnap set to true if the edges of the rectangles of the opaque
|
|
* region would be snapped to device pixels when drawing
|
|
* @return a region of the item that is opaque --- that is, every pixel
|
|
* that is visible is painted with an opaque
|
|
* color. This is useful for determining when one piece
|
|
* of content completely obscures another so that we can do occlusion
|
|
* culling.
|
|
* This does not take clipping into account.
|
|
*/
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap)
|
|
{
|
|
*aSnap = false;
|
|
return nsRegion();
|
|
}
|
|
/**
|
|
* If this returns true, then aColor is set to the uniform color
|
|
* @return true if the item is guaranteed to paint every pixel in its
|
|
* bounds with the same (possibly translucent) color
|
|
*/
|
|
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) { return false; }
|
|
/**
|
|
* @return true if the contents of this item are rendered fixed relative
|
|
* to the nearest viewport.
|
|
*/
|
|
virtual bool ShouldFixToViewport(LayerManager* aManager)
|
|
{ return false; }
|
|
|
|
virtual bool ClearsBackground()
|
|
{ return false; }
|
|
|
|
virtual bool ProvidesFontSmoothingBackgroundColor(nsDisplayListBuilder* aBuilder,
|
|
nscolor* aColor)
|
|
{ return false; }
|
|
|
|
/**
|
|
* Returns true if all layers that can be active should be forced to be
|
|
* active. Requires setting the pref layers.force-active=true.
|
|
*/
|
|
static bool ForceActiveLayers();
|
|
|
|
/**
|
|
* Returns the maximum number of layers that should be created
|
|
* or -1 for no limit. Requires setting the pref layers.max-acitve.
|
|
*/
|
|
static int32_t MaxActiveLayers();
|
|
|
|
/**
|
|
* @return LAYER_NONE if BuildLayer will return null. In this case
|
|
* there is no layer for the item, and Paint should be called instead
|
|
* to paint the content using Thebes.
|
|
* Return LAYER_INACTIVE if there is a layer --- BuildLayer will
|
|
* not return null (unless there's an error) --- but the layer contents
|
|
* are not changing frequently. In this case it makes sense to composite
|
|
* the layer into a PaintedLayer with other content, so we don't have to
|
|
* recomposite it every time we paint.
|
|
* Note: GetLayerState is only allowed to return LAYER_INACTIVE if all
|
|
* descendant display items returned LAYER_INACTIVE or LAYER_NONE. Also,
|
|
* all descendant display item frames must have an active scrolled root
|
|
* that's either the same as this item's frame's active scrolled root, or
|
|
* a descendant of this item's frame. This ensures that the entire
|
|
* set of display items can be collapsed onto a single PaintedLayer.
|
|
* Return LAYER_ACTIVE if the layer is active, that is, its contents are
|
|
* changing frequently. In this case it makes sense to keep the layer
|
|
* as a separate buffer in VRAM and composite it into the destination
|
|
* every time we paint.
|
|
*
|
|
* Users of GetLayerState should check ForceActiveLayers() and if it returns
|
|
* true, change a returned value of LAYER_INACTIVE to LAYER_ACTIVE.
|
|
*/
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters)
|
|
{ return mozilla::LAYER_NONE; }
|
|
/**
|
|
* Return true to indicate the layer should be constructed even if it's
|
|
* completely invisible.
|
|
*/
|
|
virtual bool ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder)
|
|
{ return false; }
|
|
/**
|
|
* Actually paint this item to some rendering context.
|
|
* Content outside mVisibleRect need not be painted.
|
|
* aCtx must be set up as for nsDisplayList::Paint.
|
|
*/
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) {}
|
|
|
|
#ifdef MOZ_DUMP_PAINTING
|
|
/**
|
|
* Mark this display item as being painted via FrameLayerBuilder::DrawPaintedLayer.
|
|
*/
|
|
bool Painted() { return mPainted; }
|
|
|
|
/**
|
|
* Check if this display item has been painted.
|
|
*/
|
|
void SetPainted() { mPainted = true; }
|
|
#endif
|
|
|
|
/**
|
|
* Get the layer drawn by this display item. Call this only if
|
|
* GetLayerState() returns something other than LAYER_NONE.
|
|
* If GetLayerState returned LAYER_NONE then Paint will be called
|
|
* instead.
|
|
* This is called while aManager is in the construction phase.
|
|
*
|
|
* The caller (nsDisplayList) is responsible for setting the visible
|
|
* region of the layer.
|
|
*
|
|
* @param aContainerParameters should be passed to
|
|
* FrameLayerBuilder::BuildContainerLayerFor if a ContainerLayer is
|
|
* constructed.
|
|
*/
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters)
|
|
{ return nullptr; }
|
|
|
|
/**
|
|
* On entry, aVisibleRegion contains the region (relative to ReferenceFrame())
|
|
* which may be visible. If the display item opaquely covers an area, it
|
|
* can remove that area from aVisibleRegion before returning.
|
|
* nsDisplayList::ComputeVisibility automatically subtracts the region
|
|
* returned by GetOpaqueRegion, and automatically removes items whose bounds
|
|
* do not intersect the visible area, so implementations of
|
|
* nsDisplayItem::ComputeVisibility do not need to do these things.
|
|
* nsDisplayList::ComputeVisibility will already have set mVisibleRect on
|
|
* this item to the intersection of *aVisibleRegion and this item's bounds.
|
|
* We rely on that, so this should only be called by
|
|
* nsDisplayList::ComputeVisibility or nsDisplayItem::RecomputeVisibility.
|
|
* aAllowVisibleRegionExpansion is a rect where we are allowed to
|
|
* expand the visible region and is only used for making sure the
|
|
* background behind a plugin is visible.
|
|
* This method needs to be idempotent.
|
|
*
|
|
* @return true if the item is visible, false if no part of the item
|
|
* is visible.
|
|
*/
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion);
|
|
|
|
/**
|
|
* Try to merge with the other item (which is below us in the display
|
|
* list). This gets used by nsDisplayClip to coalesce clipping operations
|
|
* (optimization), by nsDisplayOpacity to merge rendering for the same
|
|
* content element into a single opacity group (correctness), and will be
|
|
* used by nsDisplayOutline to merge multiple outlines for the same element
|
|
* (also for correctness).
|
|
* @return true if the merge was successful and the other item should be deleted
|
|
*/
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Appends the underlying frames of all display items that have been
|
|
* merged into this one (excluding this item's own underlying frame)
|
|
* to aFrames.
|
|
*/
|
|
virtual void GetMergedFrames(nsTArray<nsIFrame*>* aFrames) {}
|
|
|
|
/**
|
|
* During the visibility computation and after TryMerge, display lists may
|
|
* return true here to flatten themselves away, removing them. This
|
|
* flattening is distinctly different from FlattenTo, which occurs before
|
|
* items are merged together.
|
|
*/
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* If this has a child list where the children are in the same coordinate
|
|
* system as this item (i.e., they have the same reference frame),
|
|
* return the list.
|
|
*/
|
|
virtual nsDisplayList* GetSameCoordinateSystemChildren() { return nullptr; }
|
|
virtual void UpdateBounds(nsDisplayListBuilder* aBuilder) {}
|
|
|
|
/**
|
|
* If this has a child list, return it, even if the children are in
|
|
* a different coordinate system to this item.
|
|
*/
|
|
virtual nsDisplayList* GetChildren() { return nullptr; }
|
|
|
|
/**
|
|
* Returns the visible rect.
|
|
*/
|
|
const nsRect& GetVisibleRect() const { return mVisibleRect; }
|
|
|
|
/**
|
|
* Returns the visible rect for the children, relative to their
|
|
* reference frame. Can be different from mVisibleRect for nsDisplayTransform,
|
|
* since the reference frame for the children is different from the reference
|
|
* frame for the item itself.
|
|
*/
|
|
virtual const nsRect& GetVisibleRectForChildren() const { return mVisibleRect; }
|
|
|
|
/**
|
|
* Stores the given opacity value to be applied when drawing. It is an error to
|
|
* call this if CanApplyOpacity returned false.
|
|
*/
|
|
virtual void ApplyOpacity(nsDisplayListBuilder* aBuilder,
|
|
float aOpacity,
|
|
const DisplayItemClip* aClip) {
|
|
NS_ASSERTION(CanApplyOpacity(), "ApplyOpacity not supported on this type");
|
|
}
|
|
/**
|
|
* Returns true if this display item would return true from ApplyOpacity without
|
|
* actually applying the opacity. Otherwise returns false.
|
|
*/
|
|
virtual bool CanApplyOpacity() const {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* For debugging and stuff
|
|
*/
|
|
virtual const char* Name() = 0;
|
|
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) {}
|
|
|
|
nsDisplayItem* GetAbove() { return mAbove; }
|
|
|
|
/**
|
|
* Like ComputeVisibility, but does the work that nsDisplayList
|
|
* does per-item:
|
|
* -- Intersects GetBounds with aVisibleRegion and puts the result
|
|
* in mVisibleRect
|
|
* -- Subtracts bounds from aVisibleRegion if the item is opaque
|
|
*/
|
|
bool RecomputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion);
|
|
|
|
/**
|
|
* Returns the result of aBuilder->ToReferenceFrame(GetUnderlyingFrame())
|
|
*/
|
|
const nsPoint& ToReferenceFrame() const {
|
|
NS_ASSERTION(mFrame, "No frame?");
|
|
return mToReferenceFrame;
|
|
}
|
|
/**
|
|
* @return the root of the display list's frame (sub)tree, whose origin
|
|
* establishes the coordinate system for the display list
|
|
*/
|
|
const nsIFrame* ReferenceFrame() const { return mReferenceFrame; }
|
|
|
|
/**
|
|
* Returns the reference frame for display item children of this item.
|
|
*/
|
|
virtual const nsIFrame* ReferenceFrameForChildren() const { return mReferenceFrame; }
|
|
|
|
/**
|
|
* Checks if this display item (or any children) contains content that might
|
|
* be rendered with component alpha (e.g. subpixel antialiasing). Returns the
|
|
* bounds of the area that needs component alpha, or an empty rect if nothing
|
|
* in the item does.
|
|
*/
|
|
virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) { return nsRect(); }
|
|
|
|
/**
|
|
* Disable usage of component alpha. Currently only relevant for items that have text.
|
|
*/
|
|
virtual void DisableComponentAlpha() {}
|
|
|
|
/**
|
|
* Check if we can add async animations to the layer for this display item.
|
|
*/
|
|
virtual bool CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) {
|
|
return false;
|
|
}
|
|
|
|
virtual bool SupportsOptimizingToImage() { return false; }
|
|
|
|
const DisplayItemClip& GetClip()
|
|
{
|
|
return mClip ? *mClip : DisplayItemClip::NoClip();
|
|
}
|
|
void SetClip(nsDisplayListBuilder* aBuilder, const DisplayItemClip& aClip)
|
|
{
|
|
if (!aClip.HasClip()) {
|
|
mClip = nullptr;
|
|
return;
|
|
}
|
|
mClip = aBuilder->AllocateDisplayItemClip(aClip);
|
|
}
|
|
|
|
void IntersectClip(nsDisplayListBuilder* aBuilder, const DisplayItemClip& aClip)
|
|
{
|
|
if (mClip) {
|
|
DisplayItemClip temp = *mClip;
|
|
temp.IntersectWith(aClip);
|
|
SetClip(aBuilder, temp);
|
|
} else {
|
|
SetClip(aBuilder, aClip);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
friend class nsDisplayList;
|
|
|
|
nsDisplayItem() { mAbove = nullptr; }
|
|
|
|
nsIFrame* mFrame;
|
|
const DisplayItemClip* mClip;
|
|
// Result of FindReferenceFrameFor(mFrame), if mFrame is non-null
|
|
const nsIFrame* mReferenceFrame;
|
|
// Result of ToReferenceFrame(mFrame), if mFrame is non-null
|
|
nsPoint mToReferenceFrame;
|
|
// This is the rectangle that needs to be painted.
|
|
// Display item construction sets this to the dirty rect.
|
|
// nsDisplayList::ComputeVisibility sets this to the visible region
|
|
// of the item by intersecting the current visible region with the bounds
|
|
// of the item. Paint implementations can use this to limit their drawing.
|
|
// Guaranteed to be contained in GetBounds().
|
|
nsRect mVisibleRect;
|
|
#ifdef MOZ_DUMP_PAINTING
|
|
// True if this frame has been painted.
|
|
bool mPainted;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* Manages a singly-linked list of display list items.
|
|
*
|
|
* mSentinel is the sentinel list value, the first value in the null-terminated
|
|
* linked list of items. mTop is the last item in the list (whose 'above'
|
|
* pointer is null). This class has no virtual methods. So list objects are just
|
|
* two pointers.
|
|
*
|
|
* Stepping upward through this list is very fast. Stepping downward is very
|
|
* slow so we don't support it. The methods that need to step downward
|
|
* (HitTest(), ComputeVisibility()) internally build a temporary array of all
|
|
* the items while they do the downward traversal, so overall they're still
|
|
* linear time. We have optimized for efficient AppendToTop() of both
|
|
* items and lists, with minimal codesize. AppendToBottom() is efficient too.
|
|
*/
|
|
class nsDisplayList {
|
|
public:
|
|
typedef mozilla::layers::Layer Layer;
|
|
typedef mozilla::layers::LayerManager LayerManager;
|
|
typedef mozilla::layers::PaintedLayer PaintedLayer;
|
|
|
|
/**
|
|
* Create an empty list.
|
|
*/
|
|
nsDisplayList()
|
|
: mIsOpaque(false)
|
|
, mForceTransparentSurface(false)
|
|
{
|
|
mTop = &mSentinel;
|
|
mSentinel.mAbove = nullptr;
|
|
}
|
|
~nsDisplayList() {
|
|
if (mSentinel.mAbove) {
|
|
NS_WARNING("Nonempty list left over?");
|
|
}
|
|
DeleteAll();
|
|
}
|
|
|
|
/**
|
|
* Append an item to the top of the list. The item must not currently
|
|
* be in a list and cannot be null.
|
|
*/
|
|
void AppendToTop(nsDisplayItem* aItem) {
|
|
NS_ASSERTION(aItem, "No item to append!");
|
|
NS_ASSERTION(!aItem->mAbove, "Already in a list!");
|
|
mTop->mAbove = aItem;
|
|
mTop = aItem;
|
|
}
|
|
|
|
/**
|
|
* Append a new item to the top of the list. If the item is null we return
|
|
* NS_ERROR_OUT_OF_MEMORY. The intended usage is AppendNewToTop(new ...);
|
|
*/
|
|
void AppendNewToTop(nsDisplayItem* aItem) {
|
|
if (aItem) {
|
|
AppendToTop(aItem);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Append a new item to the bottom of the list. If the item is null we return
|
|
* NS_ERROR_OUT_OF_MEMORY. The intended usage is AppendNewToBottom(new ...);
|
|
*/
|
|
void AppendNewToBottom(nsDisplayItem* aItem) {
|
|
if (aItem) {
|
|
AppendToBottom(aItem);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Append a new item to the bottom of the list. The item must be non-null
|
|
* and not already in a list.
|
|
*/
|
|
void AppendToBottom(nsDisplayItem* aItem) {
|
|
NS_ASSERTION(aItem, "No item to append!");
|
|
NS_ASSERTION(!aItem->mAbove, "Already in a list!");
|
|
aItem->mAbove = mSentinel.mAbove;
|
|
mSentinel.mAbove = aItem;
|
|
if (mTop == &mSentinel) {
|
|
mTop = aItem;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Removes all items from aList and appends them to the top of this list
|
|
*/
|
|
void AppendToTop(nsDisplayList* aList) {
|
|
if (aList->mSentinel.mAbove) {
|
|
mTop->mAbove = aList->mSentinel.mAbove;
|
|
mTop = aList->mTop;
|
|
aList->mTop = &aList->mSentinel;
|
|
aList->mSentinel.mAbove = nullptr;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Removes all items from aList and prepends them to the bottom of this list
|
|
*/
|
|
void AppendToBottom(nsDisplayList* aList) {
|
|
if (aList->mSentinel.mAbove) {
|
|
aList->mTop->mAbove = mSentinel.mAbove;
|
|
mSentinel.mAbove = aList->mSentinel.mAbove;
|
|
if (mTop == &mSentinel) {
|
|
mTop = aList->mTop;
|
|
}
|
|
|
|
aList->mTop = &aList->mSentinel;
|
|
aList->mSentinel.mAbove = nullptr;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove an item from the bottom of the list and return it.
|
|
*/
|
|
nsDisplayItem* RemoveBottom();
|
|
|
|
/**
|
|
* Remove all items from the list and call their destructors.
|
|
*/
|
|
void DeleteAll();
|
|
|
|
/**
|
|
* @return the item at the top of the list, or null if the list is empty
|
|
*/
|
|
nsDisplayItem* GetTop() const {
|
|
return mTop != &mSentinel ? static_cast<nsDisplayItem*>(mTop) : nullptr;
|
|
}
|
|
/**
|
|
* @return the item at the bottom of the list, or null if the list is empty
|
|
*/
|
|
nsDisplayItem* GetBottom() const { return mSentinel.mAbove; }
|
|
bool IsEmpty() const { return mTop == &mSentinel; }
|
|
|
|
/**
|
|
* This is *linear time*!
|
|
* @return the number of items in the list
|
|
*/
|
|
uint32_t Count() const;
|
|
/**
|
|
* Stable sort the list by the z-order of GetUnderlyingFrame() on
|
|
* each item. 'auto' is counted as zero.
|
|
* It is assumed that the list is already in content document order.
|
|
*/
|
|
void SortByZOrder(nsDisplayListBuilder* aBuilder);
|
|
/**
|
|
* Stable sort the list by the tree order of the content of
|
|
* GetUnderlyingFrame() on each item. z-index is ignored.
|
|
* @param aCommonAncestor a common ancestor of all the content elements
|
|
* associated with the display items, for speeding up tree order
|
|
* checks, or nullptr if not known; it's only a hint, if it is not an
|
|
* ancestor of some elements, then we lose performance but not correctness
|
|
*/
|
|
void SortByContentOrder(nsDisplayListBuilder* aBuilder, nsIContent* aCommonAncestor);
|
|
/**
|
|
* Stable sort this list by CSS 'order' property order.
|
|
* http://dev.w3.org/csswg/css-flexbox-1/#order-property
|
|
* (also applies to CSS Grid although it's in the Flexbox spec ATM)
|
|
* It is assumed that the list is already in document content order.
|
|
*/
|
|
void SortByCSSOrder(nsDisplayListBuilder* aBuilder);
|
|
|
|
/**
|
|
* Generic stable sort. Take care, because some of the items might be nsDisplayLists
|
|
* themselves.
|
|
* aCmp(item1, item2) should return true if item1 <= item2. We sort the items
|
|
* into increasing order.
|
|
*/
|
|
typedef bool (* SortLEQ)(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
|
|
void* aClosure);
|
|
void Sort(nsDisplayListBuilder* aBuilder, SortLEQ aCmp, void* aClosure);
|
|
|
|
/**
|
|
* Compute visiblity for the items in the list.
|
|
* We put this logic here so it can be shared by top-level
|
|
* painting and also display items that maintain child lists.
|
|
* This is also a good place to put ComputeVisibility-related logic
|
|
* that must be applied to every display item. In particular, this
|
|
* sets mVisibleRect on each display item.
|
|
* This sets mIsOpaque if the entire visible area of this list has
|
|
* been removed from aVisibleRegion when we return.
|
|
* This does not remove any items from the list, so we can recompute
|
|
* visiblity with different regions later (see
|
|
* FrameLayerBuilder::DrawPaintedLayer).
|
|
* This method needs to be idempotent.
|
|
*
|
|
* @param aVisibleRegion the area that is visible, relative to the
|
|
* reference frame; on return, this contains the area visible under the list.
|
|
* I.e., opaque contents of this list are subtracted from aVisibleRegion.
|
|
* @param aListVisibleBounds must be equal to the bounds of the intersection
|
|
* of aVisibleRegion and GetBounds() for this list.
|
|
* @param aDisplayPortFrame If the item for which this list corresponds is
|
|
* within a displayport, the scroll frame for which that display port
|
|
* applies. For root scroll frames, you can pass the the root frame instead.
|
|
* @return true if any item in the list is visible.
|
|
*/
|
|
bool ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aListVisibleBounds,
|
|
nsIFrame* aDisplayPortFrame = nullptr);
|
|
|
|
/**
|
|
* As ComputeVisibilityForSublist, but computes visibility for a root
|
|
* list (a list that does not belong to an nsDisplayItem).
|
|
* This method needs to be idempotent.
|
|
*
|
|
* @param aVisibleRegion the area that is visible
|
|
* @param aDisplayPortFrame The root scroll frame, if a displayport is set
|
|
*/
|
|
bool ComputeVisibilityForRoot(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
nsIFrame* aDisplayPortFrame = nullptr);
|
|
|
|
/**
|
|
* Returns true if the visible region output from ComputeVisiblity was
|
|
* empty, i.e. everything visible in this list is opaque.
|
|
*/
|
|
bool IsOpaque() const {
|
|
return mIsOpaque;
|
|
}
|
|
|
|
/**
|
|
* Returns true if any display item requires the surface to be transparent.
|
|
*/
|
|
bool NeedsTransparentSurface() const {
|
|
return mForceTransparentSurface;
|
|
}
|
|
/**
|
|
* Paint the list to the rendering context. We assume that (0,0) in aCtx
|
|
* corresponds to the origin of the reference frame. For best results,
|
|
* aCtx's current transform should make (0,0) pixel-aligned. The
|
|
* rectangle in aDirtyRect is painted, which *must* be contained in the
|
|
* dirty rect used to construct the display list.
|
|
*
|
|
* If aFlags contains PAINT_USE_WIDGET_LAYERS and
|
|
* ShouldUseWidgetLayerManager() is set, then we will paint using
|
|
* the reference frame's widget's layer manager (and ctx may be null),
|
|
* otherwise we will use a temporary BasicLayerManager and ctx must
|
|
* not be null.
|
|
*
|
|
* If PAINT_FLUSH_LAYERS is set, we'll force a completely new layer
|
|
* tree to be created for this paint *and* the next paint.
|
|
*
|
|
* If PAINT_EXISTING_TRANSACTION is set, the reference frame's widget's
|
|
* layer manager has already had BeginTransaction() called on it and
|
|
* we should not call it again.
|
|
*
|
|
* If PAINT_COMPRESSED is set, the FrameLayerBuilder should be set to compressed mode
|
|
* to avoid short cut optimizations.
|
|
*
|
|
* This must only be called on the root display list of the display list
|
|
* tree.
|
|
*
|
|
* We return the layer manager used for painting --- mainly so that
|
|
* callers can dump its layer tree if necessary.
|
|
*/
|
|
enum {
|
|
PAINT_DEFAULT = 0,
|
|
PAINT_USE_WIDGET_LAYERS = 0x01,
|
|
PAINT_FLUSH_LAYERS = 0x02,
|
|
PAINT_EXISTING_TRANSACTION = 0x04,
|
|
PAINT_NO_COMPOSITE = 0x08,
|
|
PAINT_COMPRESSED = 0x10
|
|
};
|
|
already_AddRefed<LayerManager> PaintRoot(nsDisplayListBuilder* aBuilder,
|
|
nsRenderingContext* aCtx,
|
|
uint32_t aFlags);
|
|
/**
|
|
* Get the bounds. Takes the union of the bounds of all children.
|
|
* The result is not cached.
|
|
*/
|
|
nsRect GetBounds(nsDisplayListBuilder* aBuilder) const;
|
|
/**
|
|
* Find the topmost display item that returns a non-null frame, and return
|
|
* the frame.
|
|
*/
|
|
void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
nsDisplayItem::HitTestState* aState,
|
|
nsTArray<nsIFrame*> *aOutFrames) const;
|
|
/**
|
|
* Compute the union of the visible rects of the items in the list. The
|
|
* result is not cached.
|
|
*/
|
|
nsRect GetVisibleRect() const;
|
|
|
|
void SetIsOpaque()
|
|
{
|
|
mIsOpaque = true;
|
|
}
|
|
void SetNeedsTransparentSurface()
|
|
{
|
|
mForceTransparentSurface = true;
|
|
}
|
|
|
|
private:
|
|
// This class is only used on stack, so we don't have to worry about leaking
|
|
// it. Don't let us be heap-allocated!
|
|
void* operator new(size_t sz) CPP_THROW_NEW;
|
|
|
|
nsDisplayItemLink mSentinel;
|
|
nsDisplayItemLink* mTop;
|
|
|
|
// This is set by ComputeVisibility
|
|
nsRect mVisibleRect;
|
|
// This is set to true by FrameLayerBuilder if the final visible region
|
|
// is empty (i.e. everything that was visible is covered by some
|
|
// opaque content in this list).
|
|
bool mIsOpaque;
|
|
// This is set to true by FrameLayerBuilder if any display item in this
|
|
// list needs to force the surface containing this list to be transparent.
|
|
bool mForceTransparentSurface;
|
|
};
|
|
|
|
/**
|
|
* This is passed as a parameter to nsIFrame::BuildDisplayList. That method
|
|
* will put any generated items onto the appropriate list given here. It's
|
|
* basically just a collection with one list for each separate stacking layer.
|
|
* The lists themselves are external to this object and thus can be shared
|
|
* with others. Some of the list pointers may even refer to the same list.
|
|
*/
|
|
class nsDisplayListSet {
|
|
public:
|
|
/**
|
|
* @return a list where one should place the border and/or background for
|
|
* this frame (everything from steps 1 and 2 of CSS 2.1 appendix E)
|
|
*/
|
|
nsDisplayList* BorderBackground() const { return mBorderBackground; }
|
|
/**
|
|
* @return a list where one should place the borders and/or backgrounds for
|
|
* block-level in-flow descendants (step 4 of CSS 2.1 appendix E)
|
|
*/
|
|
nsDisplayList* BlockBorderBackgrounds() const { return mBlockBorderBackgrounds; }
|
|
/**
|
|
* @return a list where one should place descendant floats (step 5 of
|
|
* CSS 2.1 appendix E)
|
|
*/
|
|
nsDisplayList* Floats() const { return mFloats; }
|
|
/**
|
|
* @return a list where one should place the (pseudo) stacking contexts
|
|
* for descendants of this frame (everything from steps 3, 7 and 8
|
|
* of CSS 2.1 appendix E)
|
|
*/
|
|
nsDisplayList* PositionedDescendants() const { return mPositioned; }
|
|
/**
|
|
* @return a list where one should place the outlines
|
|
* for this frame and its descendants (step 9 of CSS 2.1 appendix E)
|
|
*/
|
|
nsDisplayList* Outlines() const { return mOutlines; }
|
|
/**
|
|
* @return a list where one should place all other content
|
|
*/
|
|
nsDisplayList* Content() const { return mContent; }
|
|
|
|
nsDisplayListSet(nsDisplayList* aBorderBackground,
|
|
nsDisplayList* aBlockBorderBackgrounds,
|
|
nsDisplayList* aFloats,
|
|
nsDisplayList* aContent,
|
|
nsDisplayList* aPositionedDescendants,
|
|
nsDisplayList* aOutlines) :
|
|
mBorderBackground(aBorderBackground),
|
|
mBlockBorderBackgrounds(aBlockBorderBackgrounds),
|
|
mFloats(aFloats),
|
|
mContent(aContent),
|
|
mPositioned(aPositionedDescendants),
|
|
mOutlines(aOutlines) {
|
|
}
|
|
|
|
/**
|
|
* A copy constructor that lets the caller override the BorderBackground
|
|
* list.
|
|
*/
|
|
nsDisplayListSet(const nsDisplayListSet& aLists,
|
|
nsDisplayList* aBorderBackground) :
|
|
mBorderBackground(aBorderBackground),
|
|
mBlockBorderBackgrounds(aLists.BlockBorderBackgrounds()),
|
|
mFloats(aLists.Floats()),
|
|
mContent(aLists.Content()),
|
|
mPositioned(aLists.PositionedDescendants()),
|
|
mOutlines(aLists.Outlines()) {
|
|
}
|
|
|
|
/**
|
|
* Move all display items in our lists to top of the corresponding lists in the
|
|
* destination.
|
|
*/
|
|
void MoveTo(const nsDisplayListSet& aDestination) const;
|
|
|
|
private:
|
|
// This class is only used on stack, so we don't have to worry about leaking
|
|
// it. Don't let us be heap-allocated!
|
|
void* operator new(size_t sz) CPP_THROW_NEW;
|
|
|
|
protected:
|
|
nsDisplayList* mBorderBackground;
|
|
nsDisplayList* mBlockBorderBackgrounds;
|
|
nsDisplayList* mFloats;
|
|
nsDisplayList* mContent;
|
|
nsDisplayList* mPositioned;
|
|
nsDisplayList* mOutlines;
|
|
};
|
|
|
|
/**
|
|
* A specialization of nsDisplayListSet where the lists are actually internal
|
|
* to the object, and all distinct.
|
|
*/
|
|
struct nsDisplayListCollection : public nsDisplayListSet {
|
|
nsDisplayListCollection() :
|
|
nsDisplayListSet(&mLists[0], &mLists[1], &mLists[2], &mLists[3], &mLists[4],
|
|
&mLists[5]) {}
|
|
explicit nsDisplayListCollection(nsDisplayList* aBorderBackground) :
|
|
nsDisplayListSet(aBorderBackground, &mLists[1], &mLists[2], &mLists[3], &mLists[4],
|
|
&mLists[5]) {}
|
|
|
|
/**
|
|
* Sort all lists by content order.
|
|
*/
|
|
void SortAllByContentOrder(nsDisplayListBuilder* aBuilder, nsIContent* aCommonAncestor) {
|
|
for (int32_t i = 0; i < 6; ++i) {
|
|
mLists[i].SortByContentOrder(aBuilder, aCommonAncestor);
|
|
}
|
|
}
|
|
|
|
private:
|
|
// This class is only used on stack, so we don't have to worry about leaking
|
|
// it. Don't let us be heap-allocated!
|
|
void* operator new(size_t sz) CPP_THROW_NEW;
|
|
|
|
nsDisplayList mLists[6];
|
|
};
|
|
|
|
|
|
class nsDisplayImageContainer : public nsDisplayItem {
|
|
public:
|
|
typedef mozilla::LayerIntPoint LayerIntPoint;
|
|
typedef mozilla::LayoutDeviceRect LayoutDeviceRect;
|
|
typedef mozilla::layers::ImageContainer ImageContainer;
|
|
typedef mozilla::layers::ImageLayer ImageLayer;
|
|
|
|
nsDisplayImageContainer(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame)
|
|
{}
|
|
|
|
/**
|
|
* @return true if this display item can be optimized into an image layer.
|
|
* It is an error to call GetContainer() unless you've called
|
|
* CanOptimizeToImageLayer() first and it returned true.
|
|
*/
|
|
virtual bool CanOptimizeToImageLayer(LayerManager* aManager,
|
|
nsDisplayListBuilder* aBuilder) = 0;
|
|
|
|
virtual already_AddRefed<ImageContainer> GetContainer(LayerManager* aManager,
|
|
nsDisplayListBuilder* aBuilder) = 0;
|
|
virtual void ConfigureLayer(ImageLayer* aLayer,
|
|
const ContainerLayerParameters& aParameters) = 0;
|
|
|
|
virtual bool SupportsOptimizingToImage() override { return true; }
|
|
};
|
|
|
|
/**
|
|
* Use this class to implement not-very-frequently-used display items
|
|
* that are not opaque, do not receive events, and are bounded by a frame's
|
|
* border-rect.
|
|
*
|
|
* This should not be used for display items which are created frequently,
|
|
* because each item is one or two pointers bigger than an item from a
|
|
* custom display item class could be, and fractionally slower. However it does
|
|
* save code size. We use this for infrequently-used item types.
|
|
*/
|
|
class nsDisplayGeneric : public nsDisplayItem {
|
|
public:
|
|
typedef void (* PaintCallback)(nsIFrame* aFrame, nsRenderingContext* aCtx,
|
|
const nsRect& aDirtyRect, nsPoint aFramePt);
|
|
|
|
nsDisplayGeneric(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
PaintCallback aPaint, const char* aName, Type aType)
|
|
: nsDisplayItem(aBuilder, aFrame), mPaint(aPaint)
|
|
, mName(aName)
|
|
, mType(aType)
|
|
{
|
|
MOZ_COUNT_CTOR(nsDisplayGeneric);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayGeneric() {
|
|
MOZ_COUNT_DTOR(nsDisplayGeneric);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder,
|
|
nsRenderingContext* aCtx) override {
|
|
mPaint(mFrame, aCtx, mVisibleRect, ToReferenceFrame());
|
|
}
|
|
NS_DISPLAY_DECL_NAME(mName, mType)
|
|
|
|
protected:
|
|
PaintCallback mPaint;
|
|
const char* mName;
|
|
Type mType;
|
|
};
|
|
|
|
/**
|
|
* Generic display item that can contain overflow. Use this in lieu of
|
|
* nsDisplayGeneric if you have a frame that should use the visual overflow
|
|
* rect of its frame when drawing items, instead of the frame's bounds.
|
|
*/
|
|
class nsDisplayGenericOverflow : public nsDisplayGeneric {
|
|
public:
|
|
nsDisplayGenericOverflow(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
PaintCallback aPaint, const char* aName, Type aType)
|
|
: nsDisplayGeneric(aBuilder, aFrame, aPaint, aName, aType)
|
|
{
|
|
MOZ_COUNT_CTOR(nsDisplayGenericOverflow);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayGenericOverflow() {
|
|
MOZ_COUNT_DTOR(nsDisplayGenericOverflow);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Returns the frame's visual overflow rect instead of the frame's bounds.
|
|
*/
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override
|
|
{
|
|
*aSnap = false;
|
|
return Frame()->GetVisualOverflowRect() + ToReferenceFrame();
|
|
}
|
|
};
|
|
|
|
#if defined(MOZ_REFLOW_PERF_DSP) && defined(MOZ_REFLOW_PERF)
|
|
/**
|
|
* This class implements painting of reflow counts. Ideally, we would simply
|
|
* make all the frame names be those returned by nsFrame::GetFrameName
|
|
* (except that tosses in the content tag name!) and support only one color
|
|
* and eliminate this class altogether in favor of nsDisplayGeneric, but for
|
|
* the time being we can't pass args to a PaintCallback, so just have a
|
|
* separate class to do the right thing. Sadly, this alsmo means we need to
|
|
* hack all leaf frame classes to handle this.
|
|
*
|
|
* XXXbz the color thing is a bit of a mess, but 0 basically means "not set"
|
|
* here... I could switch it all to nscolor, but why bother?
|
|
*/
|
|
class nsDisplayReflowCount : public nsDisplayItem {
|
|
public:
|
|
nsDisplayReflowCount(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
const char* aFrameName,
|
|
uint32_t aColor = 0)
|
|
: nsDisplayItem(aBuilder, aFrame),
|
|
mFrameName(aFrameName),
|
|
mColor(aColor)
|
|
{
|
|
MOZ_COUNT_CTOR(nsDisplayReflowCount);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayReflowCount() {
|
|
MOZ_COUNT_DTOR(nsDisplayReflowCount);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override {
|
|
mFrame->PresContext()->PresShell()->PaintCount(mFrameName, aCtx,
|
|
mFrame->PresContext(),
|
|
mFrame, ToReferenceFrame(),
|
|
mColor);
|
|
}
|
|
NS_DISPLAY_DECL_NAME("nsDisplayReflowCount", TYPE_REFLOW_COUNT)
|
|
protected:
|
|
const char* mFrameName;
|
|
nscolor mColor;
|
|
};
|
|
|
|
#define DO_GLOBAL_REFLOW_COUNT_DSP(_name) \
|
|
PR_BEGIN_MACRO \
|
|
if (!aBuilder->IsBackgroundOnly() && !aBuilder->IsForEventDelivery() && \
|
|
PresContext()->PresShell()->IsPaintingFrameCounts()) { \
|
|
aLists.Outlines()->AppendNewToTop( \
|
|
new (aBuilder) nsDisplayReflowCount(aBuilder, this, _name)); \
|
|
} \
|
|
PR_END_MACRO
|
|
|
|
#define DO_GLOBAL_REFLOW_COUNT_DSP_COLOR(_name, _color) \
|
|
PR_BEGIN_MACRO \
|
|
if (!aBuilder->IsBackgroundOnly() && !aBuilder->IsForEventDelivery() && \
|
|
PresContext()->PresShell()->IsPaintingFrameCounts()) { \
|
|
aLists.Outlines()->AppendNewToTop( \
|
|
new (aBuilder) nsDisplayReflowCount(aBuilder, this, _name, _color)); \
|
|
} \
|
|
PR_END_MACRO
|
|
|
|
/*
|
|
Macro to be used for classes that don't actually implement BuildDisplayList
|
|
*/
|
|
#define DECL_DO_GLOBAL_REFLOW_COUNT_DSP(_class, _super) \
|
|
void BuildDisplayList(nsDisplayListBuilder* aBuilder, \
|
|
const nsRect& aDirtyRect, \
|
|
const nsDisplayListSet& aLists) { \
|
|
DO_GLOBAL_REFLOW_COUNT_DSP(#_class); \
|
|
_super::BuildDisplayList(aBuilder, aDirtyRect, aLists); \
|
|
}
|
|
|
|
#else // MOZ_REFLOW_PERF_DSP && MOZ_REFLOW_PERF
|
|
|
|
#define DO_GLOBAL_REFLOW_COUNT_DSP(_name)
|
|
#define DO_GLOBAL_REFLOW_COUNT_DSP_COLOR(_name, _color)
|
|
#define DECL_DO_GLOBAL_REFLOW_COUNT_DSP(_class, _super)
|
|
|
|
#endif // MOZ_REFLOW_PERF_DSP && MOZ_REFLOW_PERF
|
|
|
|
class nsDisplayCaret : public nsDisplayItem {
|
|
public:
|
|
nsDisplayCaret(nsDisplayListBuilder* aBuilder, nsIFrame* aCaretFrame);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayCaret();
|
|
#endif
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
NS_DISPLAY_DECL_NAME("Caret", TYPE_CARET)
|
|
|
|
bool NeedsCustomScrollClip() { return mNeedsCustomScrollClip; }
|
|
void SetNeedsCustomScrollClip() { mNeedsCustomScrollClip = true; }
|
|
|
|
protected:
|
|
nsRefPtr<nsCaret> mCaret;
|
|
nsRect mBounds;
|
|
bool mNeedsCustomScrollClip;
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint the CSS borders of a frame.
|
|
*/
|
|
class nsDisplayBorder : public nsDisplayItem {
|
|
public:
|
|
nsDisplayBorder(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame);
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayBorder() {
|
|
MOZ_COUNT_DTOR(nsDisplayBorder);
|
|
}
|
|
#endif
|
|
|
|
virtual bool IsInvisibleInRect(const nsRect& aRect) override;
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
NS_DISPLAY_DECL_NAME("Border", TYPE_BORDER)
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override;
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override;
|
|
|
|
protected:
|
|
nsRect CalculateBounds(const nsStyleBorder& aStyleBorder);
|
|
|
|
nsRect mBounds;
|
|
};
|
|
|
|
/**
|
|
* A simple display item that just renders a solid color across the
|
|
* specified bounds. For canvas frames (in the CSS sense) we split off the
|
|
* drawing of the background color into this class (from nsDisplayBackground
|
|
* via nsDisplayCanvasBackground). This is done so that we can always draw a
|
|
* background color to avoid ugly flashes of white when we can't draw a full
|
|
* frame tree (ie when a page is loading). The bounds can differ from the
|
|
* frame's bounds -- this is needed when a frame/iframe is loading and there
|
|
* is not yet a frame tree to go in the frame/iframe so we use the subdoc
|
|
* frame of the parent document as a standin.
|
|
*/
|
|
class nsDisplaySolidColor : public nsDisplayItem {
|
|
public:
|
|
nsDisplaySolidColor(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
const nsRect& aBounds, nscolor aColor)
|
|
: nsDisplayItem(aBuilder, aFrame), mBounds(aBounds), mColor(aColor)
|
|
{
|
|
NS_ASSERTION(NS_GET_A(aColor) > 0, "Don't create invisible nsDisplaySolidColors!");
|
|
MOZ_COUNT_CTOR(nsDisplaySolidColor);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplaySolidColor() {
|
|
MOZ_COUNT_DTOR(nsDisplaySolidColor);
|
|
}
|
|
#endif
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override {
|
|
*aSnap = false;
|
|
nsRegion result;
|
|
if (NS_GET_A(mColor) == 255) {
|
|
result = GetBounds(aBuilder, aSnap);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) override
|
|
{
|
|
*aColor = mColor;
|
|
return true;
|
|
}
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplaySolidColorGeometry(this, aBuilder, mColor);
|
|
}
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override
|
|
{
|
|
const nsDisplaySolidColorGeometry* geometry =
|
|
static_cast<const nsDisplaySolidColorGeometry*>(aGeometry);
|
|
if (mColor != geometry->mColor) {
|
|
bool dummy;
|
|
aInvalidRegion->Or(geometry->mBounds, GetBounds(aBuilder, &dummy));
|
|
return;
|
|
}
|
|
ComputeInvalidationRegionDifference(aBuilder, geometry, aInvalidRegion);
|
|
}
|
|
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) override;
|
|
|
|
NS_DISPLAY_DECL_NAME("SolidColor", TYPE_SOLID_COLOR)
|
|
|
|
private:
|
|
nsRect mBounds;
|
|
nscolor mColor;
|
|
};
|
|
|
|
/**
|
|
* A display item to paint one background-image for a frame. Each background
|
|
* image layer gets its own nsDisplayBackgroundImage.
|
|
*/
|
|
class nsDisplayBackgroundImage : public nsDisplayImageContainer {
|
|
public:
|
|
/**
|
|
* aLayer signifies which background layer this item represents.
|
|
* aIsThemed should be the value of aFrame->IsThemed.
|
|
* aBackgroundStyle should be the result of
|
|
* nsCSSRendering::FindBackground, or null if FindBackground returned false.
|
|
*/
|
|
nsDisplayBackgroundImage(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
uint32_t aLayer,
|
|
const nsStyleBackground* aBackgroundStyle);
|
|
virtual ~nsDisplayBackgroundImage();
|
|
|
|
// This will create and append new items for all the layers of the
|
|
// background. Returns whether we appended a themed background.
|
|
static bool AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame,
|
|
nsDisplayList* aList);
|
|
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override;
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override;
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override;
|
|
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) override;
|
|
/**
|
|
* GetBounds() returns the background painting area.
|
|
*/
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
virtual uint32_t GetPerFrameKey() override;
|
|
NS_DISPLAY_DECL_NAME("Background", TYPE_BACKGROUND)
|
|
|
|
/**
|
|
* Return the background positioning area.
|
|
* (GetBounds() returns the background painting area.)
|
|
* Can be called only when mBackgroundStyle is non-null.
|
|
*/
|
|
nsRect GetPositioningArea();
|
|
|
|
/**
|
|
* Returns true if existing rendered pixels of this display item may need
|
|
* to be redrawn if the positioning area size changes but its position does
|
|
* not.
|
|
* If false, only the changed painting area needs to be redrawn when the
|
|
* positioning area size changes but its position does not.
|
|
*/
|
|
bool RenderingMightDependOnPositioningAreaSizeChange();
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplayBackgroundGeometry(this, aBuilder);
|
|
}
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override;
|
|
|
|
virtual bool CanOptimizeToImageLayer(LayerManager* aManager,
|
|
nsDisplayListBuilder* aBuilder) override;
|
|
virtual already_AddRefed<ImageContainer> GetContainer(LayerManager* aManager,
|
|
nsDisplayListBuilder *aBuilder) override;
|
|
virtual void ConfigureLayer(ImageLayer* aLayer,
|
|
const ContainerLayerParameters& aParameters) override;
|
|
|
|
static nsRegion GetInsideClipRegion(nsDisplayItem* aItem, nsPresContext* aPresContext, uint8_t aClip,
|
|
const nsRect& aRect, bool* aSnap);
|
|
|
|
virtual bool ShouldFixToViewport(LayerManager* aManager) override;
|
|
|
|
protected:
|
|
typedef class mozilla::layers::ImageContainer ImageContainer;
|
|
typedef class mozilla::layers::ImageLayer ImageLayer;
|
|
|
|
bool TryOptimizeToImageLayer(LayerManager* aManager, nsDisplayListBuilder* aBuilder);
|
|
bool IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aClipRect,
|
|
gfxRect* aDestRect);
|
|
nsRect GetBoundsInternal(nsDisplayListBuilder* aBuilder);
|
|
|
|
void PaintInternal(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx,
|
|
const nsRect& aBounds, nsRect* aClipRect);
|
|
|
|
// Cache the result of nsCSSRendering::FindBackground. Always null if
|
|
// mIsThemed is true or if FindBackground returned false.
|
|
const nsStyleBackground* mBackgroundStyle;
|
|
nsCOMPtr<imgIContainer> mImage;
|
|
nsRefPtr<ImageContainer> mImageContainer;
|
|
LayoutDeviceRect mDestRect;
|
|
/* Bounds of this display item */
|
|
nsRect mBounds;
|
|
uint32_t mLayer;
|
|
};
|
|
|
|
|
|
/**
|
|
* A display item to paint the native theme background for a frame.
|
|
*/
|
|
class nsDisplayThemedBackground : public nsDisplayItem {
|
|
public:
|
|
nsDisplayThemedBackground(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame);
|
|
virtual ~nsDisplayThemedBackground();
|
|
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override;
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override;
|
|
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) override;
|
|
virtual bool ProvidesFontSmoothingBackgroundColor(nsDisplayListBuilder* aBuilder,
|
|
nscolor* aColor) override;
|
|
|
|
/**
|
|
* GetBounds() returns the background painting area.
|
|
*/
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
NS_DISPLAY_DECL_NAME("ThemedBackground", TYPE_THEMED_BACKGROUND)
|
|
|
|
/**
|
|
* Return the background positioning area.
|
|
* (GetBounds() returns the background painting area.)
|
|
* Can be called only when mBackgroundStyle is non-null.
|
|
*/
|
|
nsRect GetPositioningArea();
|
|
|
|
/**
|
|
* Return whether our frame's document does not have the state
|
|
* NS_DOCUMENT_STATE_WINDOW_INACTIVE.
|
|
*/
|
|
bool IsWindowActive();
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplayThemedBackgroundGeometry(this, aBuilder);
|
|
}
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override;
|
|
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) override;
|
|
protected:
|
|
nsRect GetBoundsInternal();
|
|
|
|
void PaintInternal(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx,
|
|
const nsRect& aBounds, nsRect* aClipRect);
|
|
|
|
nsRect mBounds;
|
|
nsITheme::Transparency mThemeTransparency;
|
|
uint8_t mAppearance;
|
|
};
|
|
|
|
class nsDisplayBackgroundColor : public nsDisplayItem
|
|
{
|
|
public:
|
|
nsDisplayBackgroundColor(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
const nsStyleBackground* aBackgroundStyle,
|
|
nscolor aColor)
|
|
: nsDisplayItem(aBuilder, aFrame)
|
|
, mBackgroundStyle(aBackgroundStyle)
|
|
, mColor(gfxRGBA(aColor))
|
|
{ }
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override;
|
|
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) override;
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override;
|
|
|
|
virtual void ApplyOpacity(nsDisplayListBuilder* aBuilder,
|
|
float aOpacity,
|
|
const DisplayItemClip* aClip) override;
|
|
virtual bool CanApplyOpacity() const override;
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override
|
|
{
|
|
*aSnap = true;
|
|
return nsRect(ToReferenceFrame(), Frame()->GetSize());
|
|
}
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplaySolidColorGeometry(this, aBuilder,
|
|
NS_RGBA_FROM_GFXRGBA(mColor));
|
|
}
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override
|
|
{
|
|
const nsDisplaySolidColorGeometry* geometry = static_cast<const nsDisplaySolidColorGeometry*>(aGeometry);
|
|
if (NS_RGBA_FROM_GFXRGBA(mColor) != geometry->mColor) {
|
|
bool dummy;
|
|
aInvalidRegion->Or(geometry->mBounds, GetBounds(aBuilder, &dummy));
|
|
return;
|
|
}
|
|
ComputeInvalidationRegionDifference(aBuilder, geometry, aInvalidRegion);
|
|
}
|
|
|
|
NS_DISPLAY_DECL_NAME("BackgroundColor", TYPE_BACKGROUND_COLOR)
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) override;
|
|
|
|
protected:
|
|
const nsStyleBackground* mBackgroundStyle;
|
|
gfxRGBA mColor;
|
|
};
|
|
|
|
class nsDisplayClearBackground : public nsDisplayItem
|
|
{
|
|
public:
|
|
nsDisplayClearBackground(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame)
|
|
{ }
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override
|
|
{
|
|
*aSnap = true;
|
|
return nsRect(ToReferenceFrame(), Frame()->GetSize());
|
|
}
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override {
|
|
*aSnap = false;
|
|
return GetBounds(aBuilder, aSnap);
|
|
}
|
|
|
|
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) override
|
|
{
|
|
*aColor = NS_RGBA(0, 0, 0, 0);
|
|
return true;
|
|
}
|
|
|
|
virtual bool ClearsBackground() override
|
|
{
|
|
return true;
|
|
}
|
|
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override
|
|
{
|
|
return mozilla::LAYER_ACTIVE_FORCE;
|
|
}
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
|
|
NS_DISPLAY_DECL_NAME("ClearBackground", TYPE_CLEAR_BACKGROUND)
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint the outer CSS box-shadows of a frame.
|
|
*/
|
|
class nsDisplayBoxShadowOuter final : public nsDisplayItem {
|
|
public:
|
|
nsDisplayBoxShadowOuter(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame)
|
|
, mOpacity(1.0) {
|
|
MOZ_COUNT_CTOR(nsDisplayBoxShadowOuter);
|
|
mBounds = GetBoundsInternal();
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayBoxShadowOuter() {
|
|
MOZ_COUNT_DTOR(nsDisplayBoxShadowOuter);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual bool IsInvisibleInRect(const nsRect& aRect) override;
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
NS_DISPLAY_DECL_NAME("BoxShadowOuter", TYPE_BOX_SHADOW_OUTER)
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override;
|
|
|
|
virtual void ApplyOpacity(nsDisplayListBuilder* aBuilder,
|
|
float aOpacity,
|
|
const DisplayItemClip* aClip) override
|
|
{
|
|
NS_ASSERTION(CanApplyOpacity(), "ApplyOpacity should be allowed");
|
|
mOpacity = aOpacity;
|
|
if (aClip) {
|
|
IntersectClip(aBuilder, *aClip);
|
|
}
|
|
}
|
|
virtual bool CanApplyOpacity() const override
|
|
{
|
|
return true;
|
|
}
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplayBoxShadowOuterGeometry(this, aBuilder, mOpacity);
|
|
}
|
|
|
|
nsRect GetBoundsInternal();
|
|
|
|
private:
|
|
nsRegion mVisibleRegion;
|
|
nsRect mBounds;
|
|
float mOpacity;
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint the inner CSS box-shadows of a frame.
|
|
*/
|
|
class nsDisplayBoxShadowInner : public nsDisplayItem {
|
|
public:
|
|
nsDisplayBoxShadowInner(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame) {
|
|
MOZ_COUNT_CTOR(nsDisplayBoxShadowInner);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayBoxShadowInner() {
|
|
MOZ_COUNT_DTOR(nsDisplayBoxShadowInner);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
NS_DISPLAY_DECL_NAME("BoxShadowInner", TYPE_BOX_SHADOW_INNER)
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplayBoxShadowInnerGeometry(this, aBuilder);
|
|
}
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override
|
|
{
|
|
const nsDisplayBoxShadowInnerGeometry* geometry = static_cast<const nsDisplayBoxShadowInnerGeometry*>(aGeometry);
|
|
if (!geometry->mPaddingRect.IsEqualInterior(GetPaddingRect())) {
|
|
// nsDisplayBoxShadowInner is based around the padding rect, but it can
|
|
// touch pixels outside of this. We should invalidate the entire bounds.
|
|
bool snap;
|
|
aInvalidRegion->Or(geometry->mBounds, GetBounds(aBuilder, &snap));
|
|
}
|
|
}
|
|
|
|
private:
|
|
nsRegion mVisibleRegion;
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint the CSS outline of a frame.
|
|
*/
|
|
class nsDisplayOutline : public nsDisplayItem {
|
|
public:
|
|
nsDisplayOutline(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) :
|
|
nsDisplayItem(aBuilder, aFrame) {
|
|
MOZ_COUNT_CTOR(nsDisplayOutline);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayOutline() {
|
|
MOZ_COUNT_DTOR(nsDisplayOutline);
|
|
}
|
|
#endif
|
|
|
|
virtual bool IsInvisibleInRect(const nsRect& aRect) override;
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
NS_DISPLAY_DECL_NAME("Outline", TYPE_OUTLINE)
|
|
};
|
|
|
|
/**
|
|
* A class that lets you receive events within the frame bounds but never paints.
|
|
*/
|
|
class nsDisplayEventReceiver : public nsDisplayItem {
|
|
public:
|
|
nsDisplayEventReceiver(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame) {
|
|
MOZ_COUNT_CTOR(nsDisplayEventReceiver);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayEventReceiver() {
|
|
MOZ_COUNT_DTOR(nsDisplayEventReceiver);
|
|
}
|
|
#endif
|
|
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override;
|
|
NS_DISPLAY_DECL_NAME("EventReceiver", TYPE_EVENT_RECEIVER)
|
|
};
|
|
|
|
/**
|
|
* A display item that tracks event-sensitive regions which will be set
|
|
* on the ContainerLayer that eventually contains this item.
|
|
*
|
|
* One of these is created for each stacking context and pseudo-stacking-context.
|
|
* It accumulates regions for event targets contributed by the border-boxes of
|
|
* frames in its (pseudo) stacking context. A nsDisplayLayerEventRegions
|
|
* eventually contributes its regions to the PaintedLayer it is placed in by
|
|
* FrameLayerBuilder. (We don't create a display item for every frame that
|
|
* could be an event target (i.e. almost all frames), because that would be
|
|
* high overhead.)
|
|
*
|
|
* We always make leaf layers other than PaintedLayers transparent to events.
|
|
* For example, an event targeting a canvas or video will actually target the
|
|
* background of that element, which is logically in the PaintedLayer behind the
|
|
* CanvasFrame or ImageFrame. We only need to create a
|
|
* nsDisplayLayerEventRegions when an element's background could be in front
|
|
* of a lower z-order element with its own layer.
|
|
*/
|
|
class nsDisplayLayerEventRegions final : public nsDisplayItem {
|
|
public:
|
|
nsDisplayLayerEventRegions(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame)
|
|
{
|
|
MOZ_COUNT_CTOR(nsDisplayLayerEventRegions);
|
|
AddFrame(aBuilder, aFrame);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayLayerEventRegions() {
|
|
MOZ_COUNT_DTOR(nsDisplayLayerEventRegions);
|
|
}
|
|
#endif
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override
|
|
{
|
|
*aSnap = false;
|
|
return nsRect();
|
|
}
|
|
nsRect GetHitRegionBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
|
|
{
|
|
*aSnap = false;
|
|
return mHitRegion.GetBounds().Union(mMaybeHitRegion.GetBounds());
|
|
}
|
|
|
|
virtual void ApplyOpacity(nsDisplayListBuilder* aBuilder,
|
|
float aOpacity,
|
|
const DisplayItemClip* aClip) override
|
|
{
|
|
NS_ASSERTION(CanApplyOpacity(), "ApplyOpacity should be allowed");
|
|
}
|
|
virtual bool CanApplyOpacity() const override
|
|
{
|
|
return true;
|
|
}
|
|
|
|
NS_DISPLAY_DECL_NAME("LayerEventRegions", TYPE_LAYER_EVENT_REGIONS)
|
|
|
|
// Indicate that aFrame's border-box contributes to the event regions for
|
|
// this layer. aFrame must have the same reference frame as mFrame.
|
|
void AddFrame(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame);
|
|
|
|
// Indicate that an inactive scrollframe's scrollport should be added to the
|
|
// dispatch-to-content region, to ensure that APZ lets content create a
|
|
// displayport.
|
|
void AddInactiveScrollPort(const nsRect& aRect);
|
|
|
|
const nsRegion& HitRegion() { return mHitRegion; }
|
|
const nsRegion& MaybeHitRegion() { return mMaybeHitRegion; }
|
|
const nsRegion& DispatchToContentHitRegion() { return mDispatchToContentHitRegion; }
|
|
const nsRegion& NoActionRegion() { return mNoActionRegion; }
|
|
const nsRegion& HorizontalPanRegion() { return mHorizontalPanRegion; }
|
|
const nsRegion& VerticalPanRegion() { return mVerticalPanRegion; }
|
|
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) override;
|
|
|
|
private:
|
|
// Relative to aFrame's reference frame.
|
|
// These are the points that are definitely in the hit region.
|
|
nsRegion mHitRegion;
|
|
// These are points that may or may not be in the hit region. Only main-thread
|
|
// event handling can tell for sure (e.g. because complex shapes are present).
|
|
nsRegion mMaybeHitRegion;
|
|
// These are points that need to be dispatched to the content thread for
|
|
// resolution. Always contained in the union of mHitRegion and mMaybeHitRegion.
|
|
nsRegion mDispatchToContentHitRegion;
|
|
// These are points where panning is disabled, as determined by the touch-action
|
|
// property. Always contained in the union of mHitRegion and mMaybeHitRegion.
|
|
nsRegion mNoActionRegion;
|
|
// These are points where panning is horizontal, as determined by the touch-action
|
|
// property. Always contained in the union of mHitRegion and mMaybeHitRegion.
|
|
nsRegion mHorizontalPanRegion;
|
|
// These are points where panning is vertical, as determined by the touch-action
|
|
// property. Always contained in the union of mHitRegion and mMaybeHitRegion.
|
|
nsRegion mVerticalPanRegion;
|
|
};
|
|
|
|
/**
|
|
* A class that lets you wrap a display list as a display item.
|
|
*
|
|
* GetUnderlyingFrame() is troublesome for wrapped lists because if the wrapped
|
|
* list has many items, it's not clear which one has the 'underlying frame'.
|
|
* Thus we force the creator to specify what the underlying frame is. The
|
|
* underlying frame should be the root of a stacking context, because sorting
|
|
* a list containing this item will not get at the children.
|
|
*
|
|
* In some cases (e.g., clipping) we want to wrap a list but we don't have a
|
|
* particular underlying frame that is a stacking context root. In that case
|
|
* we allow the frame to be nullptr. Callers to GetUnderlyingFrame must
|
|
* detect and handle this case.
|
|
*/
|
|
class nsDisplayWrapList : public nsDisplayItem {
|
|
public:
|
|
/**
|
|
* Takes all the items from aList and puts them in our list.
|
|
*/
|
|
nsDisplayWrapList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList);
|
|
nsDisplayWrapList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayItem* aItem);
|
|
nsDisplayWrapList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame), mOverrideZIndex(0), mHasZIndexOverride(false)
|
|
{
|
|
MOZ_COUNT_CTOR(nsDisplayWrapList);
|
|
mBaseVisibleRect = mVisibleRect;
|
|
}
|
|
virtual ~nsDisplayWrapList();
|
|
/**
|
|
* Call this if the wrapped list is changed.
|
|
*/
|
|
virtual void UpdateBounds(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
mBounds = mList.GetBounds(aBuilder);
|
|
// The display list may contain content that's visible outside the visible
|
|
// rect (i.e. the current dirty rect) passed in when the item was created.
|
|
// This happens when the dirty rect has been restricted to the visual
|
|
// overflow rect of a frame for some reason (e.g. when setting up dirty
|
|
// rects in nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay), but that
|
|
// frame contains placeholders for out-of-flows that aren't descendants of
|
|
// the frame.
|
|
mVisibleRect.UnionRect(mBaseVisibleRect, mList.GetVisibleRect());
|
|
}
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override;
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override;
|
|
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) override;
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) override {
|
|
return false;
|
|
}
|
|
virtual void GetMergedFrames(nsTArray<nsIFrame*>* aFrames) override
|
|
{
|
|
aFrames->AppendElements(mMergedFrames);
|
|
}
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override {
|
|
return true;
|
|
}
|
|
virtual bool IsInvalid(nsRect& aRect) override
|
|
{
|
|
if (mFrame->IsInvalid(aRect) && aRect.IsEmpty()) {
|
|
return true;
|
|
}
|
|
nsRect temp;
|
|
for (uint32_t i = 0; i < mMergedFrames.Length(); i++) {
|
|
if (mMergedFrames[i]->IsInvalid(temp) && temp.IsEmpty()) {
|
|
aRect.SetEmpty();
|
|
return true;
|
|
}
|
|
aRect = aRect.Union(temp);
|
|
}
|
|
aRect += ToReferenceFrame();
|
|
return !aRect.IsEmpty();
|
|
}
|
|
NS_DISPLAY_DECL_NAME("WrapList", TYPE_WRAP_LIST)
|
|
|
|
virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) override;
|
|
|
|
virtual nsDisplayList* GetSameCoordinateSystemChildren() override
|
|
{
|
|
NS_ASSERTION(mList.IsEmpty() || !ReferenceFrame() ||
|
|
!mList.GetBottom()->ReferenceFrame() ||
|
|
mList.GetBottom()->ReferenceFrame() == ReferenceFrame(),
|
|
"Children must have same reference frame");
|
|
return &mList;
|
|
}
|
|
virtual nsDisplayList* GetChildren() override { return &mList; }
|
|
|
|
virtual int32_t ZIndex() const override
|
|
{
|
|
return (mHasZIndexOverride) ? mOverrideZIndex : nsDisplayItem::ZIndex();
|
|
}
|
|
|
|
void SetOverrideZIndex(int32_t aZIndex)
|
|
{
|
|
mHasZIndexOverride = true;
|
|
mOverrideZIndex = aZIndex;
|
|
}
|
|
|
|
void SetVisibleRect(const nsRect& aRect);
|
|
|
|
void SetReferenceFrame(const nsIFrame* aFrame);
|
|
|
|
/**
|
|
* This creates a copy of this item, but wrapping aItem instead of
|
|
* our existing list. Only gets called if this item returned nullptr
|
|
* for GetUnderlyingFrame(). aItem is guaranteed to return non-null from
|
|
* GetUnderlyingFrame().
|
|
*/
|
|
virtual nsDisplayWrapList* WrapWithClone(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem) {
|
|
NS_NOTREACHED("We never returned nullptr for GetUnderlyingFrame!");
|
|
return nullptr;
|
|
}
|
|
|
|
protected:
|
|
nsDisplayWrapList() {}
|
|
|
|
void MergeFromTrackingMergedFrames(nsDisplayWrapList* aOther)
|
|
{
|
|
mList.AppendToBottom(&aOther->mList);
|
|
mBounds.UnionRect(mBounds, aOther->mBounds);
|
|
mVisibleRect.UnionRect(mVisibleRect, aOther->mVisibleRect);
|
|
mMergedFrames.AppendElement(aOther->mFrame);
|
|
mMergedFrames.MoveElementsFrom(aOther->mMergedFrames);
|
|
}
|
|
|
|
nsDisplayList mList;
|
|
// The frames from items that have been merged into this item, excluding
|
|
// this item's own frame.
|
|
nsTArray<nsIFrame*> mMergedFrames;
|
|
nsRect mBounds;
|
|
// Visible rect contributed by this display item itself.
|
|
// Our mVisibleRect may include the visible areas of children.
|
|
nsRect mBaseVisibleRect;
|
|
int32_t mOverrideZIndex;
|
|
bool mHasZIndexOverride;
|
|
};
|
|
|
|
/**
|
|
* We call WrapDisplayList on the in-flow lists: BorderBackground(),
|
|
* BlockBorderBackgrounds() and Content().
|
|
* We call WrapDisplayItem on each item of Outlines(), PositionedDescendants(),
|
|
* and Floats(). This is done to support special wrapping processing for frames
|
|
* that may not be in-flow descendants of the current frame.
|
|
*/
|
|
class nsDisplayWrapper {
|
|
public:
|
|
// This is never instantiated directly (it has pure virtual methods), so no
|
|
// need to count constructors and destructors.
|
|
|
|
virtual bool WrapBorderBackground() { return true; }
|
|
virtual nsDisplayItem* WrapList(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, nsDisplayList* aList) = 0;
|
|
virtual nsDisplayItem* WrapItem(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem) = 0;
|
|
|
|
nsresult WrapLists(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
const nsDisplayListSet& aIn, const nsDisplayListSet& aOut);
|
|
nsresult WrapListsInPlace(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
const nsDisplayListSet& aLists);
|
|
protected:
|
|
nsDisplayWrapper() {}
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint a stacking context with translucency
|
|
* set by the stacking context root frame's 'opacity' style.
|
|
*/
|
|
class nsDisplayOpacity : public nsDisplayWrapList {
|
|
public:
|
|
nsDisplayOpacity(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayOpacity();
|
|
#endif
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override;
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override;
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) override;
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override
|
|
{
|
|
// We don't need to compute an invalidation region since we have LayerTreeInvalidation
|
|
}
|
|
virtual void ApplyOpacity(nsDisplayListBuilder* aBuilder,
|
|
float aOpacity,
|
|
const DisplayItemClip* aClip) override;
|
|
virtual bool CanApplyOpacity() const override;
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override;
|
|
bool NeedsActiveLayer(nsDisplayListBuilder* aBuilder);
|
|
NS_DISPLAY_DECL_NAME("Opacity", TYPE_OPACITY)
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) override;
|
|
|
|
bool CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) override;
|
|
|
|
private:
|
|
float mOpacity;
|
|
};
|
|
|
|
class nsDisplayMixBlendMode : public nsDisplayWrapList {
|
|
public:
|
|
nsDisplayMixBlendMode(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList, uint32_t aFlags = 0);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayMixBlendMode();
|
|
#endif
|
|
|
|
nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override;
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override
|
|
{
|
|
// We don't need to compute an invalidation region since we have LayerTreeInvalidation
|
|
}
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override;
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) override;
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override {
|
|
return false;
|
|
}
|
|
NS_DISPLAY_DECL_NAME("MixBlendMode", TYPE_MIX_BLEND_MODE)
|
|
};
|
|
|
|
class nsDisplayBlendContainer : public nsDisplayWrapList {
|
|
public:
|
|
nsDisplayBlendContainer(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList,
|
|
BlendModeSet& aContainedBlendModes);
|
|
nsDisplayBlendContainer(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayBlendContainer();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override
|
|
{
|
|
if (mCanBeActive && aManager->SupportsMixBlendModes(mContainedBlendModes)) {
|
|
return mozilla::LAYER_ACTIVE;
|
|
}
|
|
return mozilla::LAYER_INACTIVE;
|
|
}
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) override;
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override {
|
|
return false;
|
|
}
|
|
NS_DISPLAY_DECL_NAME("BlendContainer", TYPE_BLEND_CONTAINER)
|
|
|
|
private:
|
|
// The set of all blend modes used by nsDisplayMixBlendMode descendents of this container.
|
|
BlendModeSet mContainedBlendModes;
|
|
// If this is true, then we should make the layer active if all contained blend
|
|
// modes can be supported by the current layer manager.
|
|
bool mCanBeActive;
|
|
};
|
|
|
|
/**
|
|
* A display item that has no purpose but to ensure its contents get
|
|
* their own layer.
|
|
*/
|
|
class nsDisplayOwnLayer : public nsDisplayWrapList {
|
|
public:
|
|
|
|
/**
|
|
* nsDisplayOwnLayer constructor flags
|
|
*/
|
|
enum {
|
|
GENERATE_SUBDOC_INVALIDATIONS = 0x01,
|
|
VERTICAL_SCROLLBAR = 0x02,
|
|
HORIZONTAL_SCROLLBAR = 0x04,
|
|
GENERATE_SCROLLABLE_LAYER = 0x08,
|
|
SCROLLBAR_CONTAINER = 0x10
|
|
};
|
|
|
|
/**
|
|
* @param aFlags GENERATE_SUBDOC_INVALIDATIONS :
|
|
* Add UserData to the created ContainerLayer, so that invalidations
|
|
* for this layer are send to our nsPresContext.
|
|
* GENERATE_SCROLLABLE_LAYER : only valid on nsDisplaySubDocument (and
|
|
* subclasses), indicates this layer is to be a scrollable layer, so call
|
|
* ComputeFrameMetrics, etc.
|
|
* @param aScrollTarget when VERTICAL_SCROLLBAR or HORIZONTAL_SCROLLBAR
|
|
* is set in the flags, this parameter should be the ViewID of the
|
|
* scrollable content this scrollbar is for.
|
|
*/
|
|
nsDisplayOwnLayer(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList, uint32_t aFlags = 0,
|
|
ViewID aScrollTarget = mozilla::layers::FrameMetrics::NULL_SCROLL_ID,
|
|
float aScrollbarThumbRatio = 0.0f);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayOwnLayer();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override
|
|
{
|
|
return mozilla::LAYER_ACTIVE_FORCE;
|
|
}
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) override
|
|
{
|
|
// Don't allow merging, each sublist must have its own layer
|
|
return false;
|
|
}
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override {
|
|
return false;
|
|
}
|
|
uint32_t GetFlags() { return mFlags; }
|
|
NS_DISPLAY_DECL_NAME("OwnLayer", TYPE_OWN_LAYER)
|
|
protected:
|
|
uint32_t mFlags;
|
|
ViewID mScrollTarget;
|
|
float mScrollbarThumbRatio;
|
|
};
|
|
|
|
/**
|
|
* A display item for subdocuments. This is more or less the same as nsDisplayOwnLayer,
|
|
* except that it always populates the FrameMetrics instance on the ContainerLayer it
|
|
* builds.
|
|
*/
|
|
class nsDisplaySubDocument : public nsDisplayOwnLayer {
|
|
public:
|
|
nsDisplaySubDocument(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList, uint32_t aFlags);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplaySubDocument();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
|
|
virtual bool ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder) override;
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
|
|
NS_DISPLAY_DECL_NAME("SubDocument", TYPE_SUBDOCUMENT)
|
|
|
|
mozilla::UniquePtr<FrameMetrics> ComputeFrameMetrics(Layer* aLayer,
|
|
const ContainerLayerParameters& aContainerParameters);
|
|
|
|
protected:
|
|
ViewID mScrollParentId;
|
|
bool mForceDispatchToContentRegion;
|
|
};
|
|
|
|
/**
|
|
* A display item for subdocuments to capture the resolution from the presShell
|
|
* and ensure that it gets applied to all the right elements. This item creates
|
|
* a container layer.
|
|
*/
|
|
class nsDisplayResolution : public nsDisplaySubDocument {
|
|
public:
|
|
nsDisplayResolution(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList, uint32_t aFlags);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayResolution();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
NS_DISPLAY_DECL_NAME("Resolution", TYPE_RESOLUTION)
|
|
};
|
|
|
|
/**
|
|
* A display item used to represent sticky position elements. The contents
|
|
* gets its own layer and creates a stacking context, and the layer will have
|
|
* position-related metadata set on it.
|
|
*/
|
|
class nsDisplayStickyPosition : public nsDisplayOwnLayer {
|
|
public:
|
|
nsDisplayStickyPosition(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayStickyPosition();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
NS_DISPLAY_DECL_NAME("StickyPosition", TYPE_STICKY_POSITION)
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override
|
|
{
|
|
return mozilla::LAYER_ACTIVE;
|
|
}
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) override;
|
|
};
|
|
|
|
/**
|
|
* This creates an empty scrollable layer. It has no child layers.
|
|
* It is used to record the existence of a scrollable frame in the layer
|
|
* tree.
|
|
*/
|
|
class nsDisplayScrollInfoLayer : public nsDisplayWrapList
|
|
{
|
|
public:
|
|
nsDisplayScrollInfoLayer(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aScrolledFrame, nsIFrame* aScrollFrame);
|
|
NS_DISPLAY_DECL_NAME("ScrollInfoLayer", TYPE_SCROLL_INFO_LAYER)
|
|
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayScrollInfoLayer();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
|
|
virtual bool ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder) override
|
|
{ return true; }
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override {
|
|
*aSnap = false;
|
|
return nsRegion();
|
|
}
|
|
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override;
|
|
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override
|
|
{ return false; }
|
|
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) override;
|
|
|
|
mozilla::UniquePtr<FrameMetrics> ComputeFrameMetrics(Layer* aLayer,
|
|
const ContainerLayerParameters& aContainerParameters);
|
|
|
|
protected:
|
|
nsIFrame* mScrollFrame;
|
|
nsIFrame* mScrolledFrame;
|
|
ViewID mScrollParentId;
|
|
};
|
|
|
|
/**
|
|
* nsDisplayZoom is used for subdocuments that have a different full zoom than
|
|
* their parent documents. This item creates a container layer.
|
|
*/
|
|
class nsDisplayZoom : public nsDisplaySubDocument {
|
|
public:
|
|
/**
|
|
* @param aFrame is the root frame of the subdocument.
|
|
* @param aList contains the display items for the subdocument.
|
|
* @param aAPD is the app units per dev pixel ratio of the subdocument.
|
|
* @param aParentAPD is the app units per dev pixel ratio of the parent
|
|
* document.
|
|
* @param aFlags GENERATE_SUBDOC_INVALIDATIONS :
|
|
* Add UserData to the created ContainerLayer, so that invalidations
|
|
* for this layer are send to our nsPresContext.
|
|
*/
|
|
nsDisplayZoom(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList,
|
|
int32_t aAPD, int32_t aParentAPD,
|
|
uint32_t aFlags = 0);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayZoom();
|
|
#endif
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override;
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override
|
|
{
|
|
return mozilla::LAYER_ACTIVE;
|
|
}
|
|
NS_DISPLAY_DECL_NAME("Zoom", TYPE_ZOOM)
|
|
|
|
// Get the app units per dev pixel ratio of the child document.
|
|
int32_t GetChildAppUnitsPerDevPixel() { return mAPD; }
|
|
// Get the app units per dev pixel ratio of the parent document.
|
|
int32_t GetParentAppUnitsPerDevPixel() { return mParentAPD; }
|
|
|
|
private:
|
|
int32_t mAPD, mParentAPD;
|
|
};
|
|
|
|
/**
|
|
* A display item to paint a stacking context with effects
|
|
* set by the stacking context root frame's style.
|
|
*/
|
|
class nsDisplaySVGEffects : public nsDisplayWrapList {
|
|
public:
|
|
nsDisplaySVGEffects(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplaySVGEffects();
|
|
#endif
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override;
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState,
|
|
nsTArray<nsIFrame*> *aOutFrames) override;
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
|
|
bool* aSnap) override {
|
|
*aSnap = false;
|
|
return mEffectsBounds + ToReferenceFrame();
|
|
}
|
|
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion) override;
|
|
virtual bool TryMerge(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem) override;
|
|
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override {
|
|
return false;
|
|
}
|
|
NS_DISPLAY_DECL_NAME("SVGEffects", TYPE_SVG_EFFECTS)
|
|
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override;
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
|
|
gfxRect BBoxInUserSpace() const;
|
|
gfxPoint UserSpaceOffset() const;
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplaySVGEffectsGeometry(this, aBuilder);
|
|
}
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override;
|
|
|
|
void PaintAsLayer(nsDisplayListBuilder* aBuilder,
|
|
nsRenderingContext* aCtx,
|
|
LayerManager* aManager);
|
|
|
|
#ifdef MOZ_DUMP_PAINTING
|
|
void PrintEffects(nsACString& aTo);
|
|
#endif
|
|
|
|
private:
|
|
// relative to mFrame
|
|
nsRect mEffectsBounds;
|
|
};
|
|
|
|
/* A display item that applies a transformation to all of its descendant
|
|
* elements. This wrapper should only be used if there is a transform applied
|
|
* to the root element.
|
|
*
|
|
* The reason that a "bounds" rect is involved in transform calculations is
|
|
* because CSS-transforms allow percentage values for the x and y components
|
|
* of <translation-value>s, where percentages are percentages of the element's
|
|
* border box.
|
|
*
|
|
* INVARIANT: The wrapped frame is transformed or we supplied a transform getter
|
|
* function.
|
|
* INVARIANT: The wrapped frame is non-null.
|
|
*/
|
|
class nsDisplayTransform: public nsDisplayItem
|
|
{
|
|
typedef mozilla::gfx::Matrix4x4 Matrix4x4;
|
|
typedef mozilla::gfx::Point3D Point3D;
|
|
public:
|
|
/**
|
|
* Returns a matrix (in pixels) for the current frame. The matrix should be relative to
|
|
* the current frame's coordinate space.
|
|
*
|
|
* @param aFrame The frame to compute the transform for.
|
|
* @param aAppUnitsPerPixel The number of app units per graphics unit.
|
|
*/
|
|
typedef Matrix4x4 (* ComputeTransformFunction)(nsIFrame* aFrame, float aAppUnitsPerPixel);
|
|
|
|
/* Constructor accepts a display list, empties it, and wraps it up. It also
|
|
* ferries the underlying frame to the nsDisplayItem constructor.
|
|
*/
|
|
nsDisplayTransform(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame,
|
|
nsDisplayList *aList, const nsRect& aChildrenVisibleRect,
|
|
uint32_t aIndex = 0);
|
|
nsDisplayTransform(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame,
|
|
nsDisplayItem *aItem, const nsRect& aChildrenVisibleRect,
|
|
uint32_t aIndex = 0);
|
|
nsDisplayTransform(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame,
|
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nsDisplayList *aList, const nsRect& aChildrenVisibleRect,
|
|
ComputeTransformFunction aTransformGetter, uint32_t aIndex = 0);
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayTransform()
|
|
{
|
|
MOZ_COUNT_DTOR(nsDisplayTransform);
|
|
}
|
|
#endif
|
|
|
|
NS_DISPLAY_DECL_NAME("nsDisplayTransform", TYPE_TRANSFORM)
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|
|
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virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
if (mStoredList.GetComponentAlphaBounds(aBuilder).IsEmpty())
|
|
return nsRect();
|
|
bool snap;
|
|
return GetBounds(aBuilder, &snap);
|
|
}
|
|
|
|
virtual nsDisplayList* GetChildren() override { return mStoredList.GetChildren(); }
|
|
|
|
virtual void HitTest(nsDisplayListBuilder *aBuilder, const nsRect& aRect,
|
|
HitTestState *aState, nsTArray<nsIFrame*> *aOutFrames) override;
|
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virtual nsRect GetBounds(nsDisplayListBuilder *aBuilder, bool* aSnap) override;
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder *aBuilder,
|
|
bool* aSnap) override;
|
|
virtual bool IsUniform(nsDisplayListBuilder *aBuilder, nscolor* aColor) override;
|
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virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override;
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
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virtual bool ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder) override;
|
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virtual bool ComputeVisibility(nsDisplayListBuilder *aBuilder,
|
|
nsRegion *aVisibleRegion) override;
|
|
virtual bool TryMerge(nsDisplayListBuilder *aBuilder, nsDisplayItem *aItem) override;
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|
|
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virtual uint32_t GetPerFrameKey() override { return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey(); }
|
|
|
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virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
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const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override
|
|
{
|
|
// We don't need to compute an invalidation region since we have LayerTreeInvalidation
|
|
}
|
|
|
|
virtual const nsIFrame* ReferenceFrameForChildren() const override {
|
|
// If we were created using a transform-getter, then we don't
|
|
// belong to a transformed frame, and aren't a reference frame
|
|
// for our children.
|
|
if (!mTransformGetter) {
|
|
return mFrame;
|
|
}
|
|
return nsDisplayItem::ReferenceFrameForChildren();
|
|
}
|
|
|
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virtual const nsRect& GetVisibleRectForChildren() const override
|
|
{
|
|
return mChildrenVisibleRect;
|
|
}
|
|
|
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enum {
|
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INDEX_MAX = UINT32_MAX >> nsDisplayItem::TYPE_BITS
|
|
};
|
|
|
|
const Matrix4x4& GetTransform();
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|
|
|
float GetHitDepthAtPoint(nsDisplayListBuilder* aBuilder, const nsPoint& aPoint);
|
|
|
|
/**
|
|
* TransformRect takes in as parameters a rectangle (in aFrame's coordinate
|
|
* space) and returns the smallest rectangle (in aFrame's coordinate space)
|
|
* containing the transformed image of that rectangle. That is, it takes
|
|
* the four corners of the rectangle, transforms them according to the
|
|
* matrix associated with the specified frame, then returns the smallest
|
|
* rectangle containing the four transformed points.
|
|
*
|
|
* @param untransformedBounds The rectangle (in app units) to transform.
|
|
* @param aFrame The frame whose transformation should be applied. This
|
|
* function raises an assertion if aFrame is null or doesn't have a
|
|
* transform applied to it.
|
|
* @param aOrigin The origin of the transform relative to aFrame's local
|
|
* coordinate space.
|
|
* @param aBoundsOverride (optional) Rather than using the frame's computed
|
|
* bounding rect as frame bounds, use this rectangle instead. Pass
|
|
* nullptr (or nothing at all) to use the default.
|
|
*/
|
|
static nsRect TransformRect(const nsRect &aUntransformedBounds,
|
|
const nsIFrame* aFrame,
|
|
const nsPoint &aOrigin,
|
|
const nsRect* aBoundsOverride = nullptr);
|
|
|
|
static nsRect TransformRectOut(const nsRect &aUntransformedBounds,
|
|
const nsIFrame* aFrame,
|
|
const nsPoint &aOrigin,
|
|
const nsRect* aBoundsOverride = nullptr);
|
|
|
|
/* UntransformRect is like TransformRect, except that it inverts the
|
|
* transform.
|
|
*/
|
|
static bool UntransformRect(const nsRect &aTransformedBounds,
|
|
const nsRect &aChildBounds,
|
|
const nsIFrame* aFrame,
|
|
const nsPoint &aOrigin,
|
|
nsRect *aOutRect);
|
|
|
|
bool UntransformVisibleRect(nsDisplayListBuilder* aBuilder,
|
|
nsRect* aOutRect);
|
|
|
|
static Point3D GetDeltaToTransformOrigin(const nsIFrame* aFrame,
|
|
float aAppUnitsPerPixel,
|
|
const nsRect* aBoundsOverride);
|
|
|
|
static Point3D GetDeltaToPerspectiveOrigin(const nsIFrame* aFrame,
|
|
float aAppUnitsPerPixel);
|
|
|
|
struct FrameTransformProperties
|
|
{
|
|
FrameTransformProperties(const nsIFrame* aFrame,
|
|
float aAppUnitsPerPixel,
|
|
const nsRect* aBoundsOverride);
|
|
FrameTransformProperties(nsCSSValueSharedList* aTransformList,
|
|
const Point3D& aToTransformOrigin,
|
|
const Point3D& aToPerspectiveOrigin,
|
|
nscoord aChildPerspective)
|
|
: mFrame(nullptr)
|
|
, mTransformList(aTransformList)
|
|
, mToTransformOrigin(aToTransformOrigin)
|
|
, mChildPerspective(aChildPerspective)
|
|
, mToPerspectiveOrigin(aToPerspectiveOrigin)
|
|
{}
|
|
|
|
const Point3D& GetToPerspectiveOrigin() const
|
|
{
|
|
MOZ_ASSERT(mChildPerspective > 0, "Only valid with mChildPerspective > 0");
|
|
return mToPerspectiveOrigin;
|
|
}
|
|
|
|
const nsIFrame* mFrame;
|
|
nsRefPtr<nsCSSValueSharedList> mTransformList;
|
|
const Point3D mToTransformOrigin;
|
|
nscoord mChildPerspective;
|
|
|
|
private:
|
|
// mToPerspectiveOrigin is only valid if mChildPerspective > 0.
|
|
Point3D mToPerspectiveOrigin;
|
|
};
|
|
|
|
/**
|
|
* Given a frame with the -moz-transform property or an SVG transform,
|
|
* returns the transformation matrix for that frame.
|
|
*
|
|
* @param aFrame The frame to get the matrix from.
|
|
* @param aOrigin Relative to which point this transform should be applied.
|
|
* @param aAppUnitsPerPixel The number of app units per graphics unit.
|
|
* @param aBoundsOverride [optional] If this is nullptr (the default), the
|
|
* computation will use the value of TransformReferenceBox(aFrame).
|
|
* Otherwise, it will use the value of aBoundsOverride. This is
|
|
* mostly for internal use and in most cases you will not need to
|
|
* specify a value.
|
|
* @param aOffsetByOrigin If true, the resulting matrix will be translated
|
|
* by aOrigin. This translation is applied *before* the CSS transform.
|
|
*/
|
|
static gfx3DMatrix GetResultingTransformMatrix(const nsIFrame* aFrame,
|
|
const nsPoint& aOrigin,
|
|
float aAppUnitsPerPixel,
|
|
const nsRect* aBoundsOverride = nullptr,
|
|
nsIFrame** aOutAncestor = nullptr,
|
|
bool aOffsetByOrigin = false);
|
|
static gfx3DMatrix GetResultingTransformMatrix(const FrameTransformProperties& aProperties,
|
|
const nsPoint& aOrigin,
|
|
float aAppUnitsPerPixel,
|
|
const nsRect* aBoundsOverride = nullptr,
|
|
nsIFrame** aOutAncestor = nullptr);
|
|
/**
|
|
* Return true when we should try to prerender the entire contents of the
|
|
* transformed frame even when it's not completely visible (yet).
|
|
*/
|
|
static bool ShouldPrerenderTransformedContent(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame,
|
|
bool aLogAnimations = false);
|
|
bool CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) override;
|
|
|
|
/**
|
|
* This will return if it's possible for this element to be prerendered.
|
|
* This should never return false if we're going to prerender.
|
|
*/
|
|
bool MaybePrerender() const { return mMaybePrerender; }
|
|
/**
|
|
* Check if this element will be prerendered. This must be done after the
|
|
* display list has been fully built.
|
|
*/
|
|
bool ShouldPrerender(nsDisplayListBuilder* aBuilder);
|
|
|
|
virtual void WriteDebugInfo(std::stringstream& aStream) override;
|
|
|
|
private:
|
|
void SetReferenceFrameToAncestor(nsDisplayListBuilder* aBuilder);
|
|
void Init(nsDisplayListBuilder* aBuilder);
|
|
|
|
static gfx3DMatrix GetResultingTransformMatrixInternal(const FrameTransformProperties& aProperties,
|
|
const nsPoint& aOrigin,
|
|
float aAppUnitsPerPixel,
|
|
const nsRect* aBoundsOverride,
|
|
nsIFrame** aOutAncestor,
|
|
bool aOffsetByOrigin);
|
|
|
|
nsDisplayWrapList mStoredList;
|
|
Matrix4x4 mTransform;
|
|
ComputeTransformFunction mTransformGetter;
|
|
nsRect mChildrenVisibleRect;
|
|
uint32_t mIndex;
|
|
// We wont know if we pre-render until the layer building phase where we can
|
|
// check layers will-change budget.
|
|
bool mMaybePrerender;
|
|
};
|
|
|
|
/**
|
|
* This class adds basic support for limiting the rendering (in the inline axis
|
|
* of the writing mode) to the part inside the specified edges. It's a base
|
|
* class for the display item classes that do the actual work.
|
|
* The two members, mVisIStartEdge and mVisIEndEdge, are relative to the edges
|
|
* of the frame's scrollable overflow rectangle and are the amount to suppress
|
|
* on each side.
|
|
*
|
|
* Setting none, both or only one edge is allowed.
|
|
* The values must be non-negative.
|
|
* The default value for both edges is zero, which means everything is painted.
|
|
*/
|
|
class nsCharClipDisplayItem : public nsDisplayItem {
|
|
public:
|
|
nsCharClipDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame), mVisIStartEdge(0), mVisIEndEdge(0) {}
|
|
|
|
explicit nsCharClipDisplayItem(nsIFrame* aFrame)
|
|
: nsDisplayItem(aFrame) {}
|
|
|
|
virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override;
|
|
|
|
virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayItemGeometry* aGeometry,
|
|
nsRegion* aInvalidRegion) override;
|
|
|
|
struct ClipEdges {
|
|
ClipEdges(const nsDisplayItem& aItem,
|
|
nscoord aVisIStartEdge, nscoord aVisIEndEdge) {
|
|
nsRect r = aItem.Frame()->GetScrollableOverflowRect() +
|
|
aItem.ToReferenceFrame();
|
|
if (aItem.Frame()->GetWritingMode().IsVertical()) {
|
|
mVisIStart = aVisIStartEdge > 0 ? r.y + aVisIStartEdge : nscoord_MIN;
|
|
mVisIEnd =
|
|
aVisIEndEdge > 0 ? std::max(r.YMost() - aVisIEndEdge, mVisIStart)
|
|
: nscoord_MAX;
|
|
} else {
|
|
mVisIStart = aVisIStartEdge > 0 ? r.x + aVisIStartEdge : nscoord_MIN;
|
|
mVisIEnd =
|
|
aVisIEndEdge > 0 ? std::max(r.XMost() - aVisIEndEdge, mVisIStart)
|
|
: nscoord_MAX;
|
|
}
|
|
}
|
|
void Intersect(nscoord* aVisIStart, nscoord* aVisISize) const {
|
|
nscoord end = *aVisIStart + *aVisISize;
|
|
*aVisIStart = std::max(*aVisIStart, mVisIStart);
|
|
*aVisISize = std::max(std::min(end, mVisIEnd) - *aVisIStart, 0);
|
|
}
|
|
nscoord mVisIStart;
|
|
nscoord mVisIEnd;
|
|
};
|
|
|
|
ClipEdges Edges() const {
|
|
return ClipEdges(*this, mVisIStartEdge, mVisIEndEdge);
|
|
}
|
|
|
|
static nsCharClipDisplayItem* CheckCast(nsDisplayItem* aItem) {
|
|
nsDisplayItem::Type t = aItem->GetType();
|
|
return (t == nsDisplayItem::TYPE_TEXT ||
|
|
t == nsDisplayItem::TYPE_TEXT_DECORATION ||
|
|
t == nsDisplayItem::TYPE_TEXT_SHADOW)
|
|
? static_cast<nsCharClipDisplayItem*>(aItem) : nullptr;
|
|
}
|
|
|
|
// Lengths measured from the visual inline start and end sides
|
|
// (i.e. left and right respectively in horizontal writing modes,
|
|
// regardless of bidi directionality; top and bottom in vertical modes).
|
|
nscoord mVisIStartEdge;
|
|
nscoord mVisIEndEdge;
|
|
};
|
|
|
|
/**
|
|
* A wrapper layer that wraps its children in a container, then renders
|
|
* everything with an appropriate VR effect based on the HMDInfo.
|
|
*/
|
|
|
|
class nsDisplayVR : public nsDisplayOwnLayer {
|
|
public:
|
|
nsDisplayVR(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList, mozilla::gfx::VRHMDInfo* aHMD);
|
|
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aParameters) override
|
|
{
|
|
return mozilla::LAYER_ACTIVE;
|
|
}
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const ContainerLayerParameters& aContainerParameters) override;
|
|
|
|
protected:
|
|
nsRefPtr<mozilla::gfx::VRHMDInfo> mHMD;
|
|
};
|
|
|
|
#endif /*NSDISPLAYLIST_H_*/
|