зеркало из https://github.com/mozilla/gecko-dev.git
2164 строки
84 KiB
C++
2164 строки
84 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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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Novell code.
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*
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* The Initial Developer of the Original Code is Novell Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* robert@ocallahan.org
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK *****
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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 "nsCOMPtr.h"
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#include "nsIFrame.h"
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#include "nsPoint.h"
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#include "nsRect.h"
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#include "nsISelection.h"
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#include "nsCaret.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 "FrameLayerBuilder.h"
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#include "nsThemeConstants.h"
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#include <stdlib.h>
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class nsIPresShell;
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class nsIContent;
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class nsRenderingContext;
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class nsDeviceContext;
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class nsDisplayTableItem;
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class nsDisplayItem;
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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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// All types are defined in nsDisplayItemTypes.h
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#ifdef NS_DEBUG
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#define NS_DISPLAY_DECL_NAME(n, e) \
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virtual const char* Name() { return n; } \
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virtual Type GetType() { return e; }
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#else
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#define NS_DISPLAY_DECL_NAME(n, e) \
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virtual Type GetType() { return e; }
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#endif
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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 nsIWidget::ThemeGeometry ThemeGeometry;
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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 aIsForEvents PR_TRUE if we're creating this list in order to
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* determine which frame is under the mouse position
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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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OTHER
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};
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nsDisplayListBuilder(nsIFrame* aReferenceFrame, Mode aMode, PRBool aBuildCaret);
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~nsDisplayListBuilder();
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/**
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* @return PR_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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PRBool IsForEventDelivery() { return mMode == EVENT_DELIVERY; }
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/**
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* @return PR_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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PRBool IsForPluginGeometry() { return mMode == PLUGIN_GEOMETRY; }
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/**
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* @return PR_TRUE if the display list is being built for painting.
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*/
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PRBool IsForPainting() { return mMode == PAINTING; }
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/**
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* @return PR_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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PRBool 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 PR_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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PRBool IsAtRootOfPseudoStackingContext() { return mIsAtRootOfPseudoStackingContext; }
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/**
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* @return the selection that painting should be restricted to (or nsnull
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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 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* ReferenceFrame() { return mReferenceFrame; }
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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. It may be optimized to be faster than
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* aFrame->GetOffsetToCrossDoc(ReferenceFrame()) (but currently isn't).
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*/
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nsPoint ToReferenceFrame(const nsIFrame* aFrame) {
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return aFrame->GetOffsetToCrossDoc(ReferenceFrame());
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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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* 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 = PR_TRUE; }
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PRBool GetIncludeAllOutOfFlows() const { return mIncludeAllOutOfFlows; }
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/**
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* Calling this setter makes us exclude all leaf frames that does
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* not have the NS_FRAME_SELECTED_CONTENT bit.
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*/
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void SetSelectedFramesOnly() { mSelectedFramesOnly = PR_TRUE; }
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PRBool 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 = PR_TRUE; }
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PRBool GetAccurateVisibleRegions() { return mAccurateVisibleRegions; }
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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 = PR_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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PRBool 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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PRBool 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(PRBool aToWindow) { mIsPaintingToWindow = aToWindow; }
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PRBool IsPaintingToWindow() const { return mIsPaintingToWindow; }
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/**
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* Display the caret if needed.
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*/
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nsresult 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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return NS_OK;
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}
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return frame->DisplayCaret(this, aDirtyRect, aList);
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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 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 and aDirtyRect
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* should be the current dirty rect in aReferenceFrame's coordinate space.
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*/
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void EnterPresShell(nsIFrame* aReferenceFrame, const nsRect& aDirtyRect);
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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, const nsRect& aDirtyRect);
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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 or SVG
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* foreignObject.
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*/
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PRBool IsInTransform() { 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(PRBool aInTransform) { mInTransform = aInTransform; }
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/**
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* Call this if using display port for scrolling.
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*/
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void SetDisplayPort(const nsRect& aDisplayPort) {
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mHasDisplayPort = PR_TRUE;
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mDisplayPort = aDisplayPort;
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}
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const nsRect* GetDisplayPort() { return mHasDisplayPort ? &mDisplayPort : nsnull; }
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/**
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* Call this if ReferenceFrame() is a viewport frame with fixed-position
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* children, or when we construct an item which will return true from
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* ShouldFixToViewport()
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*/
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void SetHasFixedItems() { mHasFixedItems = PR_TRUE; }
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PRBool GetHasFixedItems() { return mHasFixedItems; }
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/**
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* Returns true if snapping is enabled for the final drawing context.
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* The default is true.
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*/
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PRBool IsSnappingEnabled() { return mSnappingEnabled; }
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/**
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* Set if snapping is enabled for the final drawing context.
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*/
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void SetSnappingEnabled(PRBool aSnappingEnabled) { mSnappingEnabled = aSnappingEnabled; }
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/**
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* @return PR_TRUE if images have been set to decode synchronously.
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*/
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PRBool 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(PRBool 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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PRUint32 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
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* to ensure that display list construction descends into them
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* anyway. nsDisplayListBuilder will take care of unmarking them when it is
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* destroyed.
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*/
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void MarkFramesForDisplayList(nsIFrame* aDirtyFrame,
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const nsFrameList& aFrames,
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const nsRect& aDirtyRect);
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/**
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* Return the FrameLayerBuilder.
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*/
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FrameLayerBuilder* LayerBuilder() { return &mLayerBuilder; }
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/**
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* Get the area of the final transparent region.
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*/
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const nsRegion* GetFinalTransparentRegion() { return mFinalTransparentRegion; }
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/**
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* Record the area of the final transparent region after all visibility
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* calculations were performed.
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*/
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void SetFinalTransparentRegion(const nsRegion& aFinalTransparentRegion)
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{
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mFinalTransparentRegion = &aFinalTransparentRegion;
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}
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const nsTArray<ThemeGeometry>& GetThemeGeometries() { return mThemeGeometries; }
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/**
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* Returns true if we need to descend into this frame when building
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* the display list, even though it doesn't intersect the dirty
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* rect, because it may have out-of-flows that do so.
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*/
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bool ShouldDescendIntoFrame(nsIFrame* aFrame) const {
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return
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(aFrame->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) ||
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GetIncludeAllOutOfFlows();
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}
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/**
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* Notifies the builder that a particular themed widget exists
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* at the given rectangle within the currently built display list.
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* For certain appearance values (currently only
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* NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR and NS_THEME_TOOLBAR) this gets
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* called during every display list construction, for every themed widget of
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* the right type within the display list, except for themed widgets which
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* are transformed or have effects applied to them (e.g. CSS opacity or
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* filters).
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*
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* @param aWidgetType the -moz-appearance value for the themed widget
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* @param aRect the device-pixel rect relative to the widget's displayRoot
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* for the themed widget
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*/
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void RegisterThemeGeometry(PRUint8 aWidgetType,
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const nsIntRect& aRect) {
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if (mIsPaintingToWindow && mPresShellStates.Length() == 1) {
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ThemeGeometry geometry(aWidgetType, aRect);
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mThemeGeometries.AppendElement(geometry);
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}
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}
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/**
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* Allocate memory in our arena. It will only be freed when this display list
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* builder is destroyed. This memory holds nsDisplayItems. nsDisplayItem
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* destructors are called as soon as the item is no longer used.
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*/
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void* Allocate(size_t aSize);
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/**
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* A helper class to temporarily set the value of
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* mIsAtRootOfPseudoStackingContext.
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*/
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class AutoIsRootSetter;
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friend class AutoIsRootSetter;
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class AutoIsRootSetter {
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public:
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AutoIsRootSetter(nsDisplayListBuilder* aBuilder, PRBool aIsRoot)
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: mBuilder(aBuilder), mOldValue(aBuilder->mIsAtRootOfPseudoStackingContext) {
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aBuilder->mIsAtRootOfPseudoStackingContext = aIsRoot;
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}
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~AutoIsRootSetter() {
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mBuilder->mIsAtRootOfPseudoStackingContext = mOldValue;
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}
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private:
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nsDisplayListBuilder* mBuilder;
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PRPackedBool mOldValue;
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};
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/**
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* A helper class to temporarily set the value of mInTransform.
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*/
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class AutoInTransformSetter;
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friend class AutoInTransformSetter;
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class AutoInTransformSetter {
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public:
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AutoInTransformSetter(nsDisplayListBuilder* aBuilder, PRBool aInTransform)
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: mBuilder(aBuilder), mOldValue(aBuilder->mInTransform) {
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aBuilder->mInTransform = aInTransform;
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}
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~AutoInTransformSetter() {
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mBuilder->mInTransform = mOldValue;
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}
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private:
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nsDisplayListBuilder* mBuilder;
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PRPackedBool mOldValue;
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};
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// Helpers for tables
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nsDisplayTableItem* GetCurrentTableItem() { return mCurrentTableItem; }
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void SetCurrentTableItem(nsDisplayTableItem* aTableItem) { mCurrentTableItem = aTableItem; }
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NS_DECLARE_FRAME_PROPERTY(OutOfFlowDirtyRectProperty, nsIFrame::DestroyRect)
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nsPresContext* CurrentPresContext() {
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return CurrentPresShellState()->mPresShell->GetPresContext();
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}
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private:
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void MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame, nsIFrame* aFrame,
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const nsRect& aDirtyRect);
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struct PresShellState {
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nsIPresShell* mPresShell;
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nsIFrame* mCaretFrame;
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PRUint32 mFirstFrameMarkedForDisplay;
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PRPackedBool mIsBackgroundOnly;
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};
|
|
PresShellState* CurrentPresShellState() {
|
|
NS_ASSERTION(mPresShellStates.Length() > 0,
|
|
"Someone forgot to enter a presshell");
|
|
return &mPresShellStates[mPresShellStates.Length() - 1];
|
|
}
|
|
|
|
FrameLayerBuilder mLayerBuilder;
|
|
nsIFrame* mReferenceFrame;
|
|
nsIFrame* mIgnoreScrollFrame;
|
|
PLArenaPool mPool;
|
|
nsCOMPtr<nsISelection> mBoundingSelection;
|
|
nsAutoTArray<PresShellState,8> mPresShellStates;
|
|
nsAutoTArray<nsIFrame*,100> mFramesMarkedForDisplay;
|
|
nsAutoTArray<ThemeGeometry,2> mThemeGeometries;
|
|
nsDisplayTableItem* mCurrentTableItem;
|
|
const nsRegion* mFinalTransparentRegion;
|
|
Mode mMode;
|
|
PRPackedBool mBuildCaret;
|
|
PRPackedBool mIgnoreSuppression;
|
|
PRPackedBool mHadToIgnoreSuppression;
|
|
PRPackedBool mIsAtRootOfPseudoStackingContext;
|
|
PRPackedBool mIncludeAllOutOfFlows;
|
|
PRPackedBool mSelectedFramesOnly;
|
|
PRPackedBool mAccurateVisibleRegions;
|
|
// True when we're building a display list that's directly or indirectly
|
|
// under an nsDisplayTransform
|
|
PRPackedBool mInTransform;
|
|
PRPackedBool mSyncDecodeImages;
|
|
PRPackedBool mIsPaintingToWindow;
|
|
PRPackedBool mSnappingEnabled;
|
|
PRPackedBool mHasDisplayPort;
|
|
nsRect mDisplayPort;
|
|
PRPackedBool mHasFixedItems;
|
|
};
|
|
|
|
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(nsnull) {}
|
|
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::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) :
|
|
mFrame(aFrame) {
|
|
if (aFrame) {
|
|
mToReferenceFrame = aBuilder->ToReferenceFrame(aFrame);
|
|
}
|
|
}
|
|
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 {
|
|
typedef nsTArray<ViewID> ShadowArray;
|
|
|
|
HitTestState(ShadowArray* aShadows = NULL)
|
|
: mShadows(aShadows) {
|
|
}
|
|
|
|
~HitTestState() {
|
|
NS_ASSERTION(mItemBuffer.Length() == 0,
|
|
"mItemBuffer should have been cleared");
|
|
}
|
|
|
|
nsAutoTArray<nsDisplayItem*, 100> mItemBuffer;
|
|
|
|
// It is sometimes useful to hit test for frames that are not in this
|
|
// process. Display items may append IDs into this array if it is
|
|
// non-null.
|
|
ShadowArray* mShadows;
|
|
};
|
|
|
|
/**
|
|
* 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;
|
|
/**
|
|
* If this returns a non-zero value, then pairing this with the
|
|
* GetUnderlyingFrame() pointer gives a key that uniquely identifies
|
|
* this display item in the display item tree.
|
|
* This will only return a zero value for items which wrap display lists
|
|
* and do not create a CSS stacking context, therefore requiring
|
|
* display items to be individually wrapped --- currently nsDisplayClip
|
|
* and nsDisplayClipRoundedRect only.
|
|
*/
|
|
virtual PRUint32 GetPerFrameKey() { return PRUint32(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.
|
|
*
|
|
* @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. For some items
|
|
* that wrap item lists, this could return nsnull because there is no single
|
|
* underlying frame; for leaf items it will never return nsnull.
|
|
*/
|
|
inline nsIFrame* GetUnderlyingFrame() { return mFrame; }
|
|
/**
|
|
* The default bounds is the frame border rect.
|
|
* @return a rectangle relative to aBuilder->ReferenceFrame() that
|
|
* contains the area drawn by this display item
|
|
*/
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
|
|
return nsRect(ToReferenceFrame(), GetUnderlyingFrame()->GetSize());
|
|
}
|
|
/**
|
|
* @return a region of the item that is opaque --- every pixel painted
|
|
* with an opaque color.
|
|
*/
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
PRBool* aForceTransparentSurface = nsnull)
|
|
{
|
|
if (aForceTransparentSurface) {
|
|
*aForceTransparentSurface = PR_FALSE;
|
|
}
|
|
return nsRegion();
|
|
}
|
|
/**
|
|
* If this returns true, then aColor is set to the uniform color
|
|
* @return PR_TRUE if the item is guaranteed to paint every pixel in its
|
|
* bounds with the same (possibly translucent) color
|
|
*/
|
|
virtual PRBool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) { return PR_FALSE; }
|
|
/**
|
|
* @return PR_FALSE if the painting performed by the item is invariant
|
|
* when the item's underlying frame is moved relative to aFrame.
|
|
* In other words, if you render the item at locations P and P', the rendering
|
|
* only differs by the translation.
|
|
* It return PR_TRUE for all wrapped lists.
|
|
*/
|
|
virtual PRBool IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame)
|
|
{ return PR_FALSE; }
|
|
/**
|
|
* @return PR_TRUE if the contents of this item are rendered fixed relative
|
|
* to the nearest viewport *and* they cover the viewport's scrollport.
|
|
* Only return true if the contents actually vary when scrolling in the viewport.
|
|
*/
|
|
virtual PRBool ShouldFixToViewport(nsDisplayListBuilder* aBuilder)
|
|
{ return PR_FALSE; }
|
|
|
|
/**
|
|
* @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 ThebesLayer 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 ThebesLayer.
|
|
* 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.
|
|
*/
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager)
|
|
{ return mozilla::LAYER_NONE; }
|
|
/**
|
|
* 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) {}
|
|
/**
|
|
* 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.
|
|
*/
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager)
|
|
{ return nsnull; }
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @return PR_TRUE if the item is visible, PR_FALSE if no part of the item
|
|
* is visible.
|
|
*/
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion)
|
|
{ return !mVisibleRect.IsEmpty(); }
|
|
|
|
/**
|
|
* 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 PR_TRUE if the merge was successful and the other item should be deleted
|
|
*/
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
|
|
return PR_FALSE;
|
|
}
|
|
|
|
/**
|
|
* During the visibility computation and after TryMerge, display lists may
|
|
* return PR_TRUE here to flatten themselves away, removing them. This
|
|
* flattening is distinctly different from FlattenTo, which occurs before
|
|
* items are merged together.
|
|
*/
|
|
virtual PRBool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
|
|
return PR_FALSE;
|
|
}
|
|
|
|
/**
|
|
* If this is a leaf item we return null, otherwise we return the wrapped
|
|
* list.
|
|
*/
|
|
virtual nsDisplayList* GetList() { return nsnull; }
|
|
|
|
/**
|
|
* Returns the visible rect. Should only be called after ComputeVisibility
|
|
* has happened.
|
|
*/
|
|
const nsRect& GetVisibleRect() { return mVisibleRect; }
|
|
|
|
#ifdef NS_DEBUG
|
|
/**
|
|
* For debugging and stuff
|
|
*/
|
|
virtual const char* Name() = 0;
|
|
#endif
|
|
|
|
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
|
|
*/
|
|
PRBool RecomputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion);
|
|
|
|
/**
|
|
* Returns the result of aBuilder->ToReferenceFrame(GetUnderlyingFrame())
|
|
*/
|
|
const nsPoint& ToReferenceFrame() {
|
|
NS_ASSERTION(mFrame, "No frame?");
|
|
return mToReferenceFrame;
|
|
}
|
|
|
|
/**
|
|
* 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() {}
|
|
|
|
protected:
|
|
friend class nsDisplayList;
|
|
|
|
nsDisplayItem() {
|
|
mAbove = nsnull;
|
|
}
|
|
|
|
nsIFrame* mFrame;
|
|
// Result of ToReferenceFrame(mFrame), if mFrame is non-null
|
|
nsPoint mToReferenceFrame;
|
|
// This is the rectangle that needs to be painted.
|
|
// 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;
|
|
};
|
|
|
|
/**
|
|
* 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::ThebesLayer ThebesLayer;
|
|
|
|
/**
|
|
* Create an empty list.
|
|
*/
|
|
nsDisplayList() :
|
|
mIsOpaque(PR_FALSE)
|
|
{
|
|
mTop = &mSentinel;
|
|
mSentinel.mAbove = nsnull;
|
|
#ifdef DEBUG
|
|
mDidComputeVisibility = PR_FALSE;
|
|
#endif
|
|
}
|
|
~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 ...);
|
|
*/
|
|
nsresult AppendNewToTop(nsDisplayItem* aItem) {
|
|
if (!aItem)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
AppendToTop(aItem);
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* 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 ...);
|
|
*/
|
|
nsresult AppendNewToBottom(nsDisplayItem* aItem) {
|
|
if (!aItem)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
AppendToBottom(aItem);
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* 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 = nsnull;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
mTop = aList->mTop;
|
|
mSentinel.mAbove = aList->mSentinel.mAbove;
|
|
|
|
aList->mTop = &aList->mSentinel;
|
|
aList->mSentinel.mAbove = nsnull;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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) : nsnull;
|
|
}
|
|
/**
|
|
* @return the item at the bottom of the list, or null if the list is empty
|
|
*/
|
|
nsDisplayItem* GetBottom() const { return mSentinel.mAbove; }
|
|
PRBool IsEmpty() const { return mTop == &mSentinel; }
|
|
|
|
/**
|
|
* This is *linear time*!
|
|
* @return the number of items in the list
|
|
*/
|
|
PRUint32 Count() const;
|
|
/**
|
|
* Stable sort the list by the z-order of GetUnderlyingFrame() on
|
|
* each item. 'auto' is counted as zero. Content order is used as the
|
|
* secondary order.
|
|
* @param aCommonAncestor a common ancestor of all the content elements
|
|
* associated with the display items, for speeding up tree order
|
|
* checks, or nsnull 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 SortByZOrder(nsDisplayListBuilder* aBuilder, nsIContent* aCommonAncestor);
|
|
/**
|
|
* 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 nsnull 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);
|
|
|
|
/**
|
|
* 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 PRBool (* 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::DrawThebesLayer).
|
|
*
|
|
* @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.
|
|
* @return true if any item in the list is visible.
|
|
*/
|
|
PRBool ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aListVisibleBounds,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
|
|
/**
|
|
* As ComputeVisibilityForSublist, but computes visibility for a root
|
|
* list (a list that does not belong to an nsDisplayItem).
|
|
*
|
|
* @param aVisibleRegion the area that is visible
|
|
*/
|
|
PRBool ComputeVisibilityForRoot(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion);
|
|
|
|
/**
|
|
* Returns true if the visible region output from ComputeVisiblity was
|
|
* empty, i.e. everything visible in this list is opaque.
|
|
*/
|
|
PRBool IsOpaque() const {
|
|
NS_ASSERTION(mDidComputeVisibility, "Need to have called ComputeVisibility");
|
|
return mIsOpaque;
|
|
}
|
|
|
|
/**
|
|
* Returns true if during ComputeVisibility any display item
|
|
* set the surface to be transparent.
|
|
*/
|
|
PRBool NeedsTransparentSurface() const {
|
|
NS_ASSERTION(mDidComputeVisibility, "Need to have called ComputeVisibility");
|
|
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.
|
|
*
|
|
* ComputeVisibility must be called before Paint.
|
|
*
|
|
* This must only be called on the root display list of the display list
|
|
* tree.
|
|
*/
|
|
enum {
|
|
PAINT_DEFAULT = 0,
|
|
PAINT_USE_WIDGET_LAYERS = 0x01,
|
|
PAINT_FLUSH_LAYERS = 0x02,
|
|
PAINT_EXISTING_TRANSACTION = 0x04
|
|
};
|
|
void PaintRoot(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx,
|
|
PRUint32 aFlags) const;
|
|
/**
|
|
* Like PaintRoot, but used for internal display sublists.
|
|
* aForFrame is the frame that the list is associated with.
|
|
*/
|
|
void PaintForFrame(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx,
|
|
nsIFrame* aForFrame, PRUint32 aFlags) const;
|
|
/**
|
|
* Get the bounds. Takes the union of the bounds of all children.
|
|
*/
|
|
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;
|
|
|
|
#ifdef DEBUG
|
|
PRBool DidComputeVisibility() const { return mDidComputeVisibility; }
|
|
#endif
|
|
|
|
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;
|
|
|
|
// Utility function used to massage the list during ComputeVisibility.
|
|
void FlattenTo(nsTArray<nsDisplayItem*>* aElements);
|
|
// Utility function used to massage the list during sorting, to rewrite
|
|
// any wrapper items with null GetUnderlyingFrame
|
|
void ExplodeAnonymousChildLists(nsDisplayListBuilder* aBuilder);
|
|
|
|
nsDisplayItemLink mSentinel;
|
|
nsDisplayItemLink* mTop;
|
|
|
|
// This is set by ComputeVisibility
|
|
nsRect mVisibleRect;
|
|
// This is set to true by ComputeVisibility if the final visible region
|
|
// is empty (i.e. everything that was visible is covered by some
|
|
// opaque content in this list).
|
|
PRPackedBool mIsOpaque;
|
|
// This is set to true by ComputeVisibility if any display item in this
|
|
// list needs to force the surface to be transparent (e.g. if the
|
|
// item "punch holes" on the surface by clearing part of its area).
|
|
PRPackedBool mForceTransparentSurface;
|
|
#ifdef DEBUG
|
|
PRPackedBool mDidComputeVisibility;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* 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]) {}
|
|
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 (PRInt32 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];
|
|
};
|
|
|
|
/**
|
|
* 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)
|
|
#ifdef DEBUG
|
|
, mName(aName)
|
|
#endif
|
|
, 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) {
|
|
mPaint(mFrame, aCtx, mVisibleRect, ToReferenceFrame());
|
|
}
|
|
NS_DISPLAY_DECL_NAME(mName, mType)
|
|
|
|
virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) {
|
|
if (mType == nsDisplayItem::TYPE_HEADER_FOOTER)
|
|
return GetBounds(aBuilder);
|
|
return nsRect();
|
|
}
|
|
|
|
protected:
|
|
PaintCallback mPaint;
|
|
#ifdef DEBUG
|
|
const char* mName;
|
|
#endif
|
|
Type mType;
|
|
};
|
|
|
|
#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,
|
|
PRUint32 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) {
|
|
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()) { \
|
|
nsresult _rv = \
|
|
aLists.Outlines()->AppendNewToTop( \
|
|
new (aBuilder) nsDisplayReflowCount(aBuilder, this, _name)); \
|
|
NS_ENSURE_SUCCESS(_rv, _rv); \
|
|
} \
|
|
PR_END_MACRO
|
|
|
|
#define DO_GLOBAL_REFLOW_COUNT_DSP_COLOR(_name, _color) \
|
|
PR_BEGIN_MACRO \
|
|
if (!aBuilder->IsBackgroundOnly() && !aBuilder->IsForEventDelivery() && \
|
|
PresContext()->PresShell()->IsPaintingFrameCounts()) { \
|
|
nsresult _rv = \
|
|
aLists.Outlines()->AppendNewToTop( \
|
|
new (aBuilder) nsDisplayReflowCount(aBuilder, this, _name, _color)); \
|
|
NS_ENSURE_SUCCESS(_rv, _rv); \
|
|
} \
|
|
PR_END_MACRO
|
|
|
|
/*
|
|
Macro to be used for classes that don't actually implement BuildDisplayList
|
|
*/
|
|
#define DECL_DO_GLOBAL_REFLOW_COUNT_DSP(_class, _super) \
|
|
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder, \
|
|
const nsRect& aDirtyRect, \
|
|
const nsDisplayListSet& aLists) { \
|
|
DO_GLOBAL_REFLOW_COUNT_DSP(#_class); \
|
|
return _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,
|
|
nsCaret *aCaret)
|
|
: nsDisplayItem(aBuilder, aCaretFrame), mCaret(aCaret) {
|
|
MOZ_COUNT_CTOR(nsDisplayCaret);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayCaret() {
|
|
MOZ_COUNT_DTOR(nsDisplayCaret);
|
|
}
|
|
#endif
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
|
|
// The caret returns a rect in the coordinates of mFrame.
|
|
return mCaret->GetCaretRect() + ToReferenceFrame();
|
|
}
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
NS_DISPLAY_DECL_NAME("Caret", TYPE_CARET)
|
|
protected:
|
|
nsRefPtr<nsCaret> mCaret;
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint the CSS borders of a frame.
|
|
*/
|
|
class nsDisplayBorder : public nsDisplayItem {
|
|
public:
|
|
nsDisplayBorder(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) :
|
|
nsDisplayItem(aBuilder, aFrame),
|
|
mSnappingEnabled(aBuilder->IsSnappingEnabled() && !aBuilder->IsInTransform()) {
|
|
MOZ_COUNT_CTOR(nsDisplayBorder);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayBorder() {
|
|
MOZ_COUNT_DTOR(nsDisplayBorder);
|
|
}
|
|
#endif
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
NS_DISPLAY_DECL_NAME("Border", TYPE_BORDER)
|
|
|
|
protected:
|
|
PRPackedBool mSnappingEnabled;
|
|
};
|
|
|
|
/**
|
|
* 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),
|
|
mSnappingEnabled(aBuilder->IsSnappingEnabled() && !aBuilder->IsInTransform()) {
|
|
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);
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
PRBool* aOutTransparentBackground = nsnull) {
|
|
if (aOutTransparentBackground) {
|
|
*aOutTransparentBackground = PR_FALSE;
|
|
}
|
|
nsRegion result;
|
|
if (NS_GET_A(mColor) == 255) {
|
|
result = GetBounds(aBuilder);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
virtual PRBool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor)
|
|
{
|
|
*aColor = mColor;
|
|
return PR_TRUE;
|
|
}
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
|
|
NS_DISPLAY_DECL_NAME("SolidColor", TYPE_SOLID_COLOR)
|
|
|
|
private:
|
|
nsRect mBounds;
|
|
nscolor mColor;
|
|
PRPackedBool mSnappingEnabled;
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint the CSS background of a frame.
|
|
*/
|
|
class nsDisplayBackground : public nsDisplayItem {
|
|
public:
|
|
nsDisplayBackground(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayBackground() {
|
|
MOZ_COUNT_DTOR(nsDisplayBackground);
|
|
}
|
|
#endif
|
|
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
PRBool* aForceTransparentSurface = nsnull);
|
|
virtual PRBool IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame);
|
|
virtual PRBool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor);
|
|
virtual PRBool ShouldFixToViewport(nsDisplayListBuilder* aBuilder);
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
NS_DISPLAY_DECL_NAME("Background", TYPE_BACKGROUND)
|
|
protected:
|
|
nsRegion GetInsideClipRegion(nsPresContext* aPresContext, PRUint8 aClip,
|
|
const nsRect& aRect);
|
|
|
|
/* Used to cache mFrame->IsThemed() since it isn't a cheap call */
|
|
PRPackedBool mIsThemed;
|
|
PRPackedBool mSnappingEnabled;
|
|
nsITheme::Transparency mThemeTransparency;
|
|
};
|
|
|
|
/**
|
|
* The standard display item to paint the outer CSS box-shadows of a frame.
|
|
*/
|
|
class nsDisplayBoxShadowOuter : public nsDisplayItem {
|
|
public:
|
|
nsDisplayBoxShadowOuter(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame) {
|
|
MOZ_COUNT_CTOR(nsDisplayBoxShadowOuter);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayBoxShadowOuter() {
|
|
MOZ_COUNT_DTOR(nsDisplayBoxShadowOuter);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
NS_DISPLAY_DECL_NAME("BoxShadowOuter", TYPE_BOX_SHADOW_OUTER)
|
|
|
|
private:
|
|
nsRegion mVisibleRegion;
|
|
};
|
|
|
|
/**
|
|
* 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);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
NS_DISPLAY_DECL_NAME("BoxShadowInner", TYPE_BOX_SHADOW_INNER)
|
|
|
|
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 nsRect GetBounds(nsDisplayListBuilder* aBuilder);
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
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);
|
|
NS_DISPLAY_DECL_NAME("EventReceiver", TYPE_EVENT_RECEIVER)
|
|
};
|
|
|
|
/**
|
|
* 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 nsnull. Callers to GetUnderlyingFrame must
|
|
* detect and handle this case.
|
|
*/
|
|
class nsDisplayWrapList : public nsDisplayItem {
|
|
// This is never instantiated directly, so no need to count constructors and
|
|
// destructors.
|
|
|
|
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);
|
|
virtual ~nsDisplayWrapList();
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
PRBool* aForceTransparentSurface = nsnull);
|
|
virtual PRBool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor);
|
|
virtual PRBool IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame);
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
|
|
NS_WARNING("This list should already have been flattened!!!");
|
|
return PR_FALSE;
|
|
}
|
|
NS_DISPLAY_DECL_NAME("WrapList", TYPE_WRAP_LIST)
|
|
|
|
virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder);
|
|
|
|
virtual nsDisplayList* GetList() { return &mList; }
|
|
|
|
/**
|
|
* This creates a copy of this item, but wrapping aItem instead of
|
|
* our existing list. Only gets called if this item returned nsnull
|
|
* for GetUnderlyingFrame(). aItem is guaranteed to return non-null from
|
|
* GetUnderlyingFrame().
|
|
*/
|
|
virtual nsDisplayWrapList* WrapWithClone(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem) {
|
|
NS_NOTREACHED("We never returned nsnull for GetUnderlyingFrame!");
|
|
return nsnull;
|
|
}
|
|
|
|
/**
|
|
* Returns true if all descendant display items can be placed in the same
|
|
* ThebesLayer --- GetLayerState returns LAYER_INACTIVE or LAYER_NONE,
|
|
* and they all have the given aActiveScrolledRoot.
|
|
*/
|
|
static PRBool ChildrenCanBeInactive(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager,
|
|
const nsDisplayList& aList,
|
|
nsIFrame* aActiveScrolledRoot);
|
|
|
|
protected:
|
|
nsDisplayWrapList() {}
|
|
|
|
nsDisplayList mList;
|
|
};
|
|
|
|
/**
|
|
* 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 PRBool WrapBorderBackground() { return PR_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,
|
|
PRBool* aForceTransparentSurface = nsnull);
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem);
|
|
NS_DISPLAY_DECL_NAME("Opacity", TYPE_OPACITY)
|
|
};
|
|
|
|
/**
|
|
* A display item that has no purpose but to ensure its contents get
|
|
* their own layer.
|
|
*/
|
|
class nsDisplayOwnLayer : public nsDisplayWrapList {
|
|
public:
|
|
nsDisplayOwnLayer(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayOwnLayer();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager)
|
|
{
|
|
return mozilla::LAYER_ACTIVE;
|
|
}
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem)
|
|
{
|
|
// Don't allow merging, each sublist must have its own layer
|
|
return PR_FALSE;
|
|
}
|
|
NS_DISPLAY_DECL_NAME("OwnLayer", TYPE_OWN_LAYER)
|
|
};
|
|
|
|
/**
|
|
* This potentially creates a layer for the given list of items, whose
|
|
* visibility is determined by the displayport for the given frame instead of
|
|
* what is passed in to ComputeVisibility.
|
|
*
|
|
* Here in content, we can use this to render more content than is actually
|
|
* visible. Then, the compositing process can manipulate the generated layer
|
|
* through transformations so that asynchronous scrolling can be implemented.
|
|
*
|
|
* Note that setting the displayport will not change any hit testing! The
|
|
* content process will know nothing about what the user is actually seeing,
|
|
* so it can only do hit testing for what is supposed to be the visible region.
|
|
*
|
|
* It is possible for scroll boxes to have content that can be both above and
|
|
* below content outside of the scroll box. We cannot create layers for these
|
|
* cases. This is accomplished by wrapping display items with
|
|
* nsDisplayScrollLayers. nsDisplayScrollLayers with the same scroll frame will
|
|
* be merged together. If more than one nsDisplayScrollLayer exists after
|
|
* merging, all nsDisplayScrollLayers will be flattened out so that no new
|
|
* layer is created at all.
|
|
*/
|
|
class nsDisplayScrollLayer : public nsDisplayWrapList
|
|
{
|
|
public:
|
|
/**
|
|
* @param aScrolledFrame This will determine what the displayport is. It should be
|
|
* the root content frame of the scrolled area. Note
|
|
* that nsDisplayScrollLayer will expect for
|
|
* ScrollLayerCount to be defined on aScrolledFrame.
|
|
* @param aScrollFrame The viewport frame you see this content through.
|
|
*/
|
|
nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder, nsDisplayList* aList,
|
|
nsIFrame* aForFrame, nsIFrame* aScrolledFrame,
|
|
nsIFrame* aScrollFrame);
|
|
nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem,
|
|
nsIFrame* aForFrame, nsIFrame* aScrolledFrame,
|
|
nsIFrame* aScrollFrame);
|
|
nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aForFrame, nsIFrame* aScrolledFrame,
|
|
nsIFrame* aScrollFrame);
|
|
NS_DISPLAY_DECL_NAME("ScrollLayer", TYPE_SCROLL_LAYER)
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayScrollLayer();
|
|
#endif
|
|
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem);
|
|
|
|
virtual PRBool ShouldFlattenAway(nsDisplayListBuilder* aBuilder);
|
|
|
|
// Get the number of nsDisplayScrollLayers for a scroll frame. Note that this
|
|
// number does not include nsDisplayScrollInfoLayers. If this number is not 1
|
|
// after merging, all the nsDisplayScrollLayers should flatten away.
|
|
PRWord GetScrollLayerCount();
|
|
PRWord RemoveScrollLayerCount();
|
|
|
|
private:
|
|
nsIFrame* mScrollFrame;
|
|
nsIFrame* mScrolledFrame;
|
|
};
|
|
|
|
/**
|
|
* Like nsDisplayScrollLayer, but only has metadata on the scroll frame. This
|
|
* creates a layer that has no Thebes child layer, but still allows the
|
|
* compositor process to know of the scroll frame's existence.
|
|
*
|
|
* After visibility computation, nsDisplayScrollInfoLayers should only exist if
|
|
* nsDisplayScrollLayers were all flattened away.
|
|
*
|
|
* Important!! Add info layers to the bottom of the list so they are only
|
|
* considered after the others have flattened out!
|
|
*/
|
|
class nsDisplayScrollInfoLayer : public nsDisplayScrollLayer
|
|
{
|
|
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 LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem);
|
|
|
|
virtual PRBool ShouldFlattenAway(nsDisplayListBuilder* aBuilder);
|
|
};
|
|
|
|
/**
|
|
* nsDisplayClip can clip a list of items, but we take a single item
|
|
* initially and then later merge other items into it when we merge
|
|
* adjacent matching nsDisplayClips
|
|
*/
|
|
class nsDisplayClip : public nsDisplayWrapList {
|
|
public:
|
|
/**
|
|
* @param aFrame the frame that should be considered the underlying
|
|
* frame for this content, e.g. the frame whose z-index we have. This
|
|
* is *not* the frame that is inducing the clipping.
|
|
*/
|
|
nsDisplayClip(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayItem* aItem, const nsRect& aRect);
|
|
nsDisplayClip(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList, const nsRect& aRect);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayClip();
|
|
#endif
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem);
|
|
NS_DISPLAY_DECL_NAME("Clip", TYPE_CLIP)
|
|
virtual PRUint32 GetPerFrameKey() { return 0; }
|
|
|
|
const nsRect& GetClipRect() { return mClip; }
|
|
void SetClipRect(const nsRect& aRect) { mClip = aRect; }
|
|
|
|
virtual nsDisplayWrapList* WrapWithClone(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem);
|
|
|
|
protected:
|
|
nsRect mClip;
|
|
};
|
|
|
|
/**
|
|
* A display item to clip a list of items to the border-radius of a
|
|
* frame.
|
|
*/
|
|
class nsDisplayClipRoundedRect : public nsDisplayClip {
|
|
public:
|
|
/**
|
|
* @param aFrame the frame that should be considered the underlying
|
|
* frame for this content, e.g. the frame whose z-index we have. This
|
|
* is *not* the frame that is inducing the clipping.
|
|
*/
|
|
nsDisplayClipRoundedRect(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayItem* aItem,
|
|
const nsRect& aRect, nscoord aRadii[8]);
|
|
nsDisplayClipRoundedRect(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList,
|
|
const nsRect& aRect, nscoord aRadii[8]);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayClipRoundedRect();
|
|
#endif
|
|
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
|
|
PRBool* aForceTransparentSurface = nsnull);
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem);
|
|
NS_DISPLAY_DECL_NAME("ClipRoundedRect", TYPE_CLIP_ROUNDED_RECT)
|
|
|
|
virtual nsDisplayWrapList* WrapWithClone(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayItem* aItem);
|
|
|
|
void GetRadii(nscoord aRadii[8]) {
|
|
memcpy(aRadii, mRadii, sizeof(mRadii));
|
|
}
|
|
|
|
private:
|
|
nscoord mRadii[8];
|
|
};
|
|
|
|
/**
|
|
* nsDisplayZoom is used for subdocuments that have a different full zoom than
|
|
* their parent documents. This item creates a container layer.
|
|
*/
|
|
class nsDisplayZoom : public nsDisplayOwnLayer {
|
|
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.
|
|
*/
|
|
nsDisplayZoom(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
nsDisplayList* aList,
|
|
PRInt32 aAPD, PRInt32 aParentAPD);
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayZoom();
|
|
#endif
|
|
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder);
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
NS_DISPLAY_DECL_NAME("Zoom", TYPE_ZOOM)
|
|
|
|
// Get the app units per dev pixel ratio of the child document.
|
|
PRInt32 GetChildAppUnitsPerDevPixel() { return mAPD; }
|
|
// Get the app units per dev pixel ratio of the parent document.
|
|
PRInt32 GetParentAppUnitsPerDevPixel() { return mParentAPD; }
|
|
|
|
private:
|
|
PRInt32 mAPD, mParentAPD;
|
|
};
|
|
|
|
#ifdef MOZ_SVG
|
|
/**
|
|
* 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,
|
|
PRBool* aForceTransparentSurface = nsnull);
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
|
|
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
|
|
return mBounds + aBuilder->ToReferenceFrame(mEffectsFrame);
|
|
}
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
|
|
nsRegion* aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
virtual PRBool TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem);
|
|
NS_DISPLAY_DECL_NAME("SVGEffects", TYPE_SVG_EFFECTS)
|
|
|
|
nsIFrame* GetEffectsFrame() { return mEffectsFrame; }
|
|
|
|
private:
|
|
nsIFrame* mEffectsFrame;
|
|
// relative to mEffectsFrame
|
|
nsRect mBounds;
|
|
};
|
|
#endif
|
|
|
|
/* A display item that applies a transformation to all of its descendent
|
|
* elements. This wrapper should only be used if there is a transform applied
|
|
* to the root element.
|
|
* INVARIANT: The wrapped frame is transformed.
|
|
* INVARIANT: The wrapped frame is non-null.
|
|
*/
|
|
class nsDisplayTransform: public nsDisplayItem
|
|
{
|
|
public:
|
|
/* 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) :
|
|
nsDisplayItem(aBuilder, aFrame), mStoredList(aBuilder, aFrame, aList)
|
|
{
|
|
MOZ_COUNT_CTOR(nsDisplayTransform);
|
|
}
|
|
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayTransform()
|
|
{
|
|
MOZ_COUNT_DTOR(nsDisplayTransform);
|
|
}
|
|
#endif
|
|
|
|
NS_DISPLAY_DECL_NAME("nsDisplayTransform", TYPE_TRANSFORM);
|
|
|
|
virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder)
|
|
{
|
|
if (mStoredList.GetComponentAlphaBounds(aBuilder).IsEmpty())
|
|
return nsRect();
|
|
return GetBounds(aBuilder);
|
|
}
|
|
|
|
nsDisplayWrapList* GetStoredList() { return &mStoredList; }
|
|
|
|
virtual void HitTest(nsDisplayListBuilder *aBuilder, const nsRect& aRect,
|
|
HitTestState *aState, nsTArray<nsIFrame*> *aOutFrames);
|
|
virtual nsRect GetBounds(nsDisplayListBuilder *aBuilder);
|
|
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder *aBuilder,
|
|
PRBool* aForceTransparentSurface = nsnull);
|
|
virtual PRBool IsUniform(nsDisplayListBuilder *aBuilder, nscolor* aColor);
|
|
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
|
|
LayerManager* aManager);
|
|
virtual PRBool ComputeVisibility(nsDisplayListBuilder *aBuilder,
|
|
nsRegion *aVisibleRegion,
|
|
const nsRect& aAllowVisibleRegionExpansion);
|
|
virtual PRBool TryMerge(nsDisplayListBuilder *aBuilder, nsDisplayItem *aItem);
|
|
|
|
/**
|
|
* 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
|
|
* nsnull (or nothing at all) to use the default.
|
|
*/
|
|
static nsRect TransformRect(const nsRect &aUntransformedBounds,
|
|
const nsIFrame* aFrame,
|
|
const nsPoint &aOrigin,
|
|
const nsRect* aBoundsOverride = nsnull);
|
|
|
|
static nsRect TransformRectOut(const nsRect &aUntransformedBounds,
|
|
const nsIFrame* aFrame,
|
|
const nsPoint &aOrigin,
|
|
const nsRect* aBoundsOverride = nsnull);
|
|
|
|
/* UntransformRect is like TransformRect, except that it inverts the
|
|
* transform.
|
|
*/
|
|
static nsRect UntransformRect(const nsRect &aUntransformedBounds,
|
|
const nsIFrame* aFrame,
|
|
const nsPoint &aOrigin);
|
|
|
|
/**
|
|
* Returns the bounds of a frame as defined for transforms. If
|
|
* UNIFIED_CONTINUATIONS is not defined, this is simply the frame's bounding
|
|
* rectangle, translated to the origin. Otherwise, returns the smallest
|
|
* rectangle containing a frame and all of its continuations. For example,
|
|
* if there is a <span> element with several continuations split over
|
|
* several lines, this function will return the rectangle containing all of
|
|
* those continuations. This rectangle is relative to the origin of the
|
|
* frame's local coordinate space.
|
|
*
|
|
* @param aFrame The frame to get the bounding rect for.
|
|
* @return The frame's bounding rect, as described above.
|
|
*/
|
|
static nsRect GetFrameBoundsForTransform(const nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Given a frame with the -moz-transform property, 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 aScaleFactor The number of app units per graphics unit.
|
|
* @param aBoundsOverride [optional] If this is nsnull (the default), the
|
|
* computation will use the value of GetFrameBoundsForTransform(aFrame)
|
|
* for the frame's bounding rectangle. 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.
|
|
*/
|
|
static gfxMatrix GetResultingTransformMatrix(const nsIFrame* aFrame,
|
|
const nsPoint& aOrigin,
|
|
float aFactor,
|
|
const nsRect* aBoundsOverride = nsnull);
|
|
|
|
private:
|
|
nsDisplayWrapList mStoredList;
|
|
};
|
|
|
|
#endif /*NSDISPLAYLIST_H_*/
|