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       1             : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2             :  * This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef mozilla_gfx_layers_LayersHelpers_h
       7             : #define mozilla_gfx_layers_LayersHelpers_h
       8             : 
       9             : #include "mozilla/Maybe.h"
      10             : #include "mozilla/gfx/Rect.h"
      11             : #include "mozilla/gfx/Matrix.h"
      12             : #include "mozilla/gfx/Polygon.h"
      13             : #include "nsRegion.h"
      14             : #include "nsTArray.h"
      15             : 
      16             : namespace mozilla {
      17             : namespace layers {
      18             : 
      19             : class Layer;
      20             : 
      21             : // Compute compositor information for copying the backdrop for a mix-blend
      22             : // operation.
      23             : gfx::IntRect
      24             : ComputeBackdropCopyRect(const gfx::Rect& aRect,
      25             :                         const gfx::IntRect& aClipRect,
      26             :                         const gfx::Matrix4x4& aTransform,
      27             :                         const gfx::IntRect& aRenderTargetRect,
      28             :                         gfx::Matrix4x4* aOutTransform,
      29             :                         gfx::Rect* aOutLayerQuad = nullptr);
      30             : 
      31             : // Compute uv-coordinates for a rect inside a texture.
      32             : template <typename T>
      33             : static inline gfx::Rect
      34           0 : TextureRectToCoords(const T& aRect, const gfx::IntSize& aSize)
      35             : {
      36             :   return gfx::Rect(
      37           0 :     float(aRect.x) / aSize.width,
      38           0 :     float(aRect.y) / aSize.height,
      39           0 :     float(aRect.width) / aSize.width,
      40           0 :     float(aRect.height) / aSize.height);
      41             : }
      42             : 
      43             : // This is defined in Compositor.cpp.
      44             : nsTArray<gfx::TexturedTriangle>
      45             : GenerateTexturedTriangles(const gfx::Polygon& aPolygon,
      46             :                           const gfx::Rect& aRect,
      47             :                           const gfx::Rect& aTexRect);
      48             : 
      49             : // This is defined in ContainerLayerComposite.cpp.
      50             : void TransformLayerGeometry(Layer* aLayer, Maybe<gfx::Polygon>& aGeometry);
      51             : 
      52             : } // namespace layers
      53             : } // namespace mozilla
      54             : 
      55             : #endif // mozilla_gfx_layers_LayersHelpers_h