1 files changed, 89 insertions, 0 deletions
diff --git a/gfx/layers/mlgpu/MaskOperation.h b/gfx/layers/mlgpu/MaskOperation.h
new file mode 100644
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+++ b/gfx/layers/mlgpu/MaskOperation.h
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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_gfx_layers_mlgpu_MaskOperation_h
+#define mozilla_gfx_layers_mlgpu_MaskOperation_h
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/gfx/Rect.h"
+#include "SharedBufferMLGPU.h"
+#include <vector>
+
+namespace mozilla {
+namespace layers {
+
+class FrameBuilder;
+class Layer;
+class MLGDevice;
+class MLGRenderTarget;
+class MLGTexture;
+class TextureSource;
+
+class MaskOperation {
+  NS_INLINE_DECL_REFCOUNTING(MaskOperation)
+
+ public:
+  // For when the exact texture is known ahead of time.
+  MaskOperation(FrameBuilder* aBuilder, MLGTexture* aSource);
+
+  // Return the mask rectangle in screen coordinates. This function takes a
+  // layer because a single-texture mask operation is not dependent on a
+  // specific mask transform. (Multiple mask layer operations are, and they
+  // ignore the layer parameter).
+  virtual gfx::Rect ComputeMaskRect(Layer* aLayer) const;
+
+  MLGTexture* GetTexture() const { return mTexture; }
+  bool IsEmpty() const { return !mTexture; }
+
+ protected:
+  explicit MaskOperation(FrameBuilder* aBuilder);
+  virtual ~MaskOperation();
+
+ protected:
+  RefPtr<MLGTexture> mTexture;
+};
+
+struct MaskTexture {
+  MaskTexture() : mSource(nullptr) {}
+  MaskTexture(const gfx::Rect& aRect, TextureSource* aSource)
+      : mRect(aRect), mSource(aSource) {}
+
+  bool operator<(const MaskTexture& aOther) const;
+
+  gfx::Rect mRect;
+  RefPtr<TextureSource> mSource;
+};
+
+typedef std::vector<MaskTexture> MaskTextureList;
+
+class MaskCombineOperation final : public MaskOperation {
+ public:
+  explicit MaskCombineOperation(FrameBuilder* aBuilder);
+  virtual ~MaskCombineOperation();
+
+  void Init(const MaskTextureList& aTextures);
+
+  void PrepareForRendering();
+  void Render();
+
+  gfx::Rect ComputeMaskRect(Layer* aLayer) const override { return mArea; }
+
+ private:
+  FrameBuilder* mBuilder;
+  gfx::Rect mArea;
+  MaskTextureList mTextures;
+  RefPtr<MLGRenderTarget> mTarget;
+
+  std::vector<VertexBufferSection> mInputBuffers;
+};
+
+RefPtr<TextureSource> GetMaskLayerTexture(Layer* aLayer);
+void AppendToMaskTextureList(MaskTextureList& aList, Layer* aLayer);
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_gfx_layers_mlgpu_MaskOperation_h