1 files changed, 99 insertions, 0 deletions
diff --git a/gfx/layers/BufferTexture.h b/gfx/layers/BufferTexture.h
new file mode 100644
index 000000000..2999d1d94
--- /dev/null
+++ b/gfx/layers/BufferTexture.h
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+//  * 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_LAYERS_BUFFERETEXTURE
+#define MOZILLA_LAYERS_BUFFERETEXTURE
+
+#include "mozilla/layers/TextureClient.h"
+#include "mozilla/ipc/SharedMemory.h"
+#include "mozilla/gfx/Types.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/RefPtr.h"
+
+namespace mozilla {
+namespace layers {
+
+bool ComputeHasIntermediateBuffer(gfx::SurfaceFormat aFormat,
+                                  LayersBackend aLayersBackend);
+
+class BufferTextureData : public TextureData
+{
+public:
+  static BufferTextureData* Create(gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
+                                   gfx::BackendType aMoz2DBackend,
+                                   LayersBackend aLayersBackend,
+                                   TextureFlags aFlags,
+                                   TextureAllocationFlags aAllocFlags,
+                                   LayersIPCChannel* aAllocator);
+
+  static BufferTextureData* CreateForYCbCr(KnowsCompositor* aAllocator,
+                                           gfx::IntSize aYSize,
+                                           gfx::IntSize aCbCrSize,
+                                           StereoMode aStereoMode,
+                                           YUVColorSpace aYUVColorSpace,
+                                           TextureFlags aTextureFlags);
+
+  // It is generally better to use CreateForYCbCr instead.
+  // This creates a half-initialized texture since we don't know the sizes and
+  // offsets in the buffer.
+  static BufferTextureData* CreateForYCbCrWithBufferSize(KnowsCompositor* aAllocator,
+                                                         int32_t aSize,
+                                                         YUVColorSpace aYUVColorSpace,
+                                                         TextureFlags aTextureFlags);
+
+  virtual bool Lock(OpenMode aMode) override { return true; }
+
+  virtual void Unlock() override {}
+
+  virtual void FillInfo(TextureData::Info& aInfo) const override;
+
+  virtual already_AddRefed<gfx::DrawTarget> BorrowDrawTarget() override;
+
+  virtual bool BorrowMappedData(MappedTextureData& aMap) override;
+
+  virtual bool BorrowMappedYCbCrData(MappedYCbCrTextureData& aMap) override;
+
+  // use TextureClient's default implementation
+  virtual bool UpdateFromSurface(gfx::SourceSurface* aSurface) override;
+
+  virtual BufferTextureData* AsBufferTextureData() override { return this; }
+
+  // Don't use this.
+  void SetDesciptor(const BufferDescriptor& aDesc);
+
+  Maybe<gfx::IntSize> GetCbCrSize() const;
+
+  Maybe<YUVColorSpace> GetYUVColorSpace() const;
+
+  Maybe<StereoMode> GetStereoMode() const;
+
+protected:
+  gfx::IntSize GetSize() const;
+
+  gfx::SurfaceFormat GetFormat() const;
+
+  static BufferTextureData* CreateInternal(LayersIPCChannel* aAllocator,
+                                           const BufferDescriptor& aDesc,
+                                           gfx::BackendType aMoz2DBackend,
+                                           int32_t aBufferSize,
+                                           TextureFlags aTextureFlags);
+
+  virtual uint8_t* GetBuffer() = 0;
+  virtual size_t GetBufferSize() = 0;
+
+  BufferTextureData(const BufferDescriptor& aDescriptor, gfx::BackendType aMoz2DBackend)
+  : mDescriptor(aDescriptor)
+  , mMoz2DBackend(aMoz2DBackend)
+  {}
+
+  RefPtr<gfx::DrawTarget> mDrawTarget;
+  BufferDescriptor mDescriptor;
+  gfx::BackendType mMoz2DBackend;
+};
+
+} // namespace
+} // namespace
+
+#endif