зеркало из https://github.com/mozilla/gecko-dev.git
90 строки
3.4 KiB
C++
90 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_STACKINGCONTEXTHELPER_H
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#define GFX_STACKINGCONTEXTHELPER_H
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#include "mozilla/Attributes.h"
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#include "mozilla/gfx/MatrixFwd.h"
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#include "mozilla/webrender/WebRenderAPI.h"
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#include "mozilla/webrender/WebRenderTypes.h"
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#include "Units.h"
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class nsDisplayListBuilder;
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class nsDisplayItem;
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class nsDisplayList;
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namespace mozilla {
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namespace layers {
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/**
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* This is a helper class that pushes/pops a stacking context, and manages
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* some of the coordinate space transformations needed.
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*/
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class MOZ_RAII StackingContextHelper
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{
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public:
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StackingContextHelper(const StackingContextHelper& aParentSC,
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wr::DisplayListBuilder& aBuilder,
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const nsTArray<wr::WrFilterOp>& aFilters = nsTArray<wr::WrFilterOp>(),
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const LayoutDeviceRect& aBounds = LayoutDeviceRect(),
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const gfx::Matrix4x4* aBoundTransform = nullptr,
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const wr::WrAnimationProperty* aAnimation = nullptr,
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float* aOpacityPtr = nullptr,
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gfx::Matrix4x4* aTransformPtr = nullptr,
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gfx::Matrix4x4* aPerspectivePtr = nullptr,
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const gfx::CompositionOp& aMixBlendMode = gfx::CompositionOp::OP_OVER,
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bool aBackfaceVisible = true,
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bool aIsPreserve3D = false);
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// This version of the constructor should only be used at the root level
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// of the tree, so that we have a StackingContextHelper to pass down into
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// the RenderLayer traversal, but don't actually want it to push a stacking
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// context on the display list builder.
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StackingContextHelper();
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// Pops the stacking context, if one was pushed during the constructor.
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~StackingContextHelper();
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// When this StackingContextHelper is in scope, this function can be used
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// to convert a rect from the layer system's coordinate space to a LayoutRect
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// that is relative to the stacking context. This is useful because most
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// things that are pushed inside the stacking context need to be relative
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// to the stacking context.
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// We allow passing in a LayoutDeviceRect for convenience because in a lot of
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// cases with WebRender display item generate the layout device space is the
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// same as the layer space. (TODO: try to make this more explicit somehow).
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// We also round the rectangle to ints after transforming since the output
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// is the final destination rect.
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wr::LayoutRect ToRelativeLayoutRect(const LayoutDeviceRect& aRect) const;
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// Same but for points
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wr::LayoutPoint ToRelativeLayoutPoint(const LayoutDevicePoint& aPoint) const
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{
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return wr::ToLayoutPoint(aPoint);
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}
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// Export the inherited scale
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gfx::Size GetInheritedScale() const { return mScale; }
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const gfx::Matrix& GetInheritedTransform() const
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{
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return mInheritedTransform;
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}
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bool AffectsClipPositioning() const { return mAffectsClipPositioning; }
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private:
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wr::DisplayListBuilder* mBuilder;
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gfx::Size mScale;
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gfx::Matrix mInheritedTransform;
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bool mAffectsClipPositioning;
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};
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} // namespace layers
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} // namespace mozilla
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#endif /* GFX_STACKINGCONTEXTHELPER_H */
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