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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_EffectsInfo_h
#define mozilla_dom_EffectsInfo_h
#include "nsRect.h"
namespace mozilla::dom {
/**
* An EffectsInfo contains information for a remote browser about the graphical
* effects that are being applied to it by ancestor browsers in different
* processes.
*/
class EffectsInfo {
public:
EffectsInfo() { *this = EffectsInfo::FullyHidden(); }
static EffectsInfo VisibleWithinRect(
const nsRect& aVisibleRect, const Scale2D& aRasterScale,
const ParentLayerToScreenScale2D& aTransformToAncestorScale) {
return EffectsInfo{aVisibleRect, aRasterScale, aTransformToAncestorScale};
}
static EffectsInfo FullyHidden() {
return EffectsInfo{nsRect(), Scale2D(), ParentLayerToScreenScale2D()};
}
bool operator==(const EffectsInfo& aOther) const {
return mVisibleRect == aOther.mVisibleRect &&
mRasterScale == aOther.mRasterScale &&
mTransformToAncestorScale == aOther.mTransformToAncestorScale;
}
bool operator!=(const EffectsInfo& aOther) const {
return !(*this == aOther);
}
bool IsVisible() const { return !mVisibleRect.IsEmpty(); }
// The visible rect of this browser relative to the root frame. If this is
// empty then the browser can be considered invisible.
nsRect mVisibleRect;
// The desired scale factors to apply to rasterized content to match
// transforms applied in ancestor browsers. This gets propagated into the
// scale in StackingContextHelper.
Scale2D mRasterScale;
// TransformToAncestorScale to be set on FrameMetrics. It includes CSS
// transform scales and cumulative presshell resolution.
ParentLayerToScreenScale2D mTransformToAncestorScale;
// The difference between mScaleX/Y and mTransformToAncestorScale is the way
// that CSS transforms contribute to the scale. mTransformToAncestorScale
// includes the exact scale factors of the combined CSS transform whereas
// mScaleX/Y tries to take into account animating transform scales by picking
// a larger scale so that we don't have to re-rasterize every frame but rather
// we can just scale down content rasterized on a previous frame.
// If you add new fields here, you must also update operator== and
// TabMessageUtils.
private:
EffectsInfo(const nsRect& aVisibleRect, const Scale2D& aRasterScale,
const ParentLayerToScreenScale2D& aTransformToAncestorScale)
: mVisibleRect(aVisibleRect),
mRasterScale(aRasterScale),
mTransformToAncestorScale(aTransformToAncestorScale) {}
};
} // namespace mozilla::dom
#endif // mozilla_dom_EffectsInfo_h
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