60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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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namespace mozilla {
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namespace layers {
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class WebRenderLayer;
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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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// Pushes a stacking context onto the provided DisplayListBuilder. It uses
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// the transform if provided, otherwise takes the transform from the layer.
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// It also takes the mix-blend-mode and bounds from the layer, and uses 1.0
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// for the opacity.
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StackingContextHelper(wr::DisplayListBuilder& aBuilder,
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WebRenderLayer* aLayer,
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const Maybe<gfx::Matrix4x4>& aTransform = Nothing());
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// Alternate constructor which invokes the version of PushStackingContext
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// for animations.
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StackingContextHelper(wr::DisplayListBuilder& aBuilder,
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WebRenderLayer* aLayer,
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uint64_t aAnimationsId,
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float* aOpacityPtr,
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gfx::Matrix4x4* aTransformPtr);
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// Pops the stacking context
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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 WrRect
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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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WrRect ToRelativeWrRect(const LayerRect& aRect);
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private:
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wr::DisplayListBuilder* mBuilder;
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LayerPoint mOrigin;
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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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