tor-browser

The Tor Browser
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EffectsInfo.h (2475B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef mozilla_dom_EffectsInfo_h
      8 #define mozilla_dom_EffectsInfo_h
      9 
     10 #include "Units.h"
     11 #include "nsRect.h"
     12 
     13 namespace mozilla::dom {
     14 
     15 /**
     16 * An EffectsInfo contains information for a remote browser about the graphical
     17 * effects that are being applied to it by ancestor browsers in different
     18 * processes.
     19 */
     20 class EffectsInfo {
     21 public:
     22  EffectsInfo() = default;
     23 
     24  static EffectsInfo VisibleWithinRect(
     25      const Maybe<nsRect>& aVisibleRect, const Scale2D& aRasterScale,
     26      const ParentLayerToScreenScale2D& aTransformToAncestorScale) {
     27    return EffectsInfo{aVisibleRect, aRasterScale, aTransformToAncestorScale};
     28  }
     29  static EffectsInfo FullyHidden() { return {}; }
     30 
     31  bool operator==(const EffectsInfo& aOther) const {
     32    return mVisibleRect == aOther.mVisibleRect &&
     33           mRasterScale == aOther.mRasterScale &&
     34           mTransformToAncestorScale == aOther.mTransformToAncestorScale;
     35  }
     36  bool operator!=(const EffectsInfo& aOther) const {
     37    return !(*this == aOther);
     38  }
     39 
     40  bool IsVisible() const { return mVisibleRect.isSome(); }
     41 
     42  // The visible rect of this browser relative to the root frame. This might be
     43  // empty in cases where we might still be considered visible, like if we're
     44  // zero-size but inside the viewport.
     45  Maybe<nsRect> mVisibleRect;
     46  // The desired scale factors to apply to rasterized content to match
     47  // transforms applied in ancestor browsers. This gets propagated into the
     48  // scale in StackingContextHelper.
     49  Scale2D mRasterScale;
     50  // TransformToAncestorScale to be set on FrameMetrics. It includes CSS
     51  // transform scales and cumulative presshell resolution.
     52  ParentLayerToScreenScale2D mTransformToAncestorScale;
     53 
     54  // If you add new fields here, you must also update operator== and
     55  // TabMessageUtils.
     56 
     57 private:
     58  EffectsInfo(const Maybe<nsRect>& aVisibleRect, const Scale2D& aRasterScale,
     59              const ParentLayerToScreenScale2D& aTransformToAncestorScale)
     60      : mVisibleRect(aVisibleRect),
     61        mRasterScale(aRasterScale),
     62        mTransformToAncestorScale(aTransformToAncestorScale) {}
     63 };
     64 
     65 }  // namespace mozilla::dom
     66 
     67 #endif  // mozilla_dom_EffectsInfo_h