forked from mirrors/gecko-dev
2e785a4671
Instead of just storing the gfx::Matrix from the nsDisplayTransform on the stacking context for scrolldata use, we now store a pointer to the entire nsDisplayTransform item. We will need this in the next patch. This patch should not have any functional changes. MozReview-Commit-ID: 7qsZpL3Ka0X --HG-- extra : rebase_source : b42957c83ef0591e72fa5b58ceb6650fda96e0b2
91 lines
3.6 KiB
C++
91 lines
3.6 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 nsDisplayTransform;
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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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const float* aOpacityPtr = nullptr,
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const gfx::Matrix4x4* aTransformPtr = nullptr,
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const 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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const Maybe<nsDisplayTransform*>& aDeferredTransformItem = Nothing(),
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const wr::WrClipId* aClipNodeId = nullptr,
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bool aRasterizeLocally = 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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// 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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const gfx::Matrix& GetSnappingSurfaceTransform() const
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{
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return mSnappingSurfaceTransform;
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}
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const Maybe<nsDisplayTransform*>& GetDeferredTransformItem() const;
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bool AffectsClipPositioning() const { return mAffectsClipPositioning; }
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Maybe<wr::WrClipId> ReferenceFrameId() const { return mReferenceFrameId; }
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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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// The "snapping surface" defines the space that we want to snap in.
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// You can think of it as the nearest physical surface.
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// Animated transforms create a new snapping surface, so that changes to their transform don't affect the snapping of their contents.
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// Non-animated transforms do *not* create a new snapping surface,
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// so that for example the existence of a non-animated identity transform does not affect snapping.
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gfx::Matrix mSnappingSurfaceTransform;
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bool mAffectsClipPositioning;
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Maybe<wr::WrClipId> mReferenceFrameId;
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Maybe<nsDisplayTransform*> mDeferredTransformItem;
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bool mIsPreserve3D;
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bool mRasterizeLocally;
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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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