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Diffstat (limited to '')
-rw-r--r-- | dom/ipc/EffectsInfo.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/dom/ipc/EffectsInfo.h b/dom/ipc/EffectsInfo.h new file mode 100644 index 0000000000..bd3a7cc721 --- /dev/null +++ b/dom/ipc/EffectsInfo.h @@ -0,0 +1,73 @@ +/* -*- 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 |