1 files changed, 129 insertions, 0 deletions
diff --git a/gfx/layers/BufferTexture.h b/gfx/layers/BufferTexture.h
new file mode 100644
index 0000000000..a306e4dfeb
--- /dev/null
+++ b/gfx/layers/BufferTexture.h
@@ -0,0 +1,129 @@
+/* -*- 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_LAYERS_BUFFERETEXTURE
+#define MOZILLA_LAYERS_BUFFERETEXTURE
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Types.h"
+#include "mozilla/ipc/SharedMemory.h"
+#include "mozilla/layers/TextureClient.h"
+
+namespace mozilla {
+namespace layers {
+
+class BufferTextureData : public TextureData {
+ public:
+  // ShmemAllocator needs to implement IShmemAllocator and IsSameProcess,
+  // as done in LayersIPCChannel and ISurfaceAllocator.
+  template <typename ShmemAllocator>
+  static BufferTextureData* Create(gfx::IntSize aSize,
+                                   gfx::SurfaceFormat aFormat,
+                                   gfx::BackendType aMoz2DBackend,
+                                   LayersBackend aLayersBackend,
+                                   TextureFlags aFlags,
+                                   TextureAllocationFlags aAllocFlags,
+                                   ShmemAllocator aAllocator);
+
+  static BufferTextureData* CreateForYCbCr(
+      KnowsCompositor* aAllocator, const gfx::IntRect& aDisplay,
+      const gfx::IntSize& aYSize, uint32_t aYStride,
+      const gfx::IntSize& aCbCrSize, uint32_t aCbCrStride,
+      StereoMode aStereoMode, gfx::ColorDepth aColorDepth,
+      gfx::YUVColorSpace aYUVColorSpace, gfx::ColorRange aColorRange,
+      gfx::ChromaSubsampling aSubsampling, TextureFlags aTextureFlags);
+
+  bool Lock(OpenMode aMode) override { return true; }
+
+  void Unlock() override {}
+
+  void FillInfo(TextureData::Info& aInfo) const override;
+
+  already_AddRefed<gfx::DrawTarget> BorrowDrawTarget() override;
+
+  bool BorrowMappedData(MappedTextureData& aMap) override;
+
+  bool BorrowMappedYCbCrData(MappedYCbCrTextureData& aMap) override;
+
+  // use TextureClient's default implementation
+  bool UpdateFromSurface(gfx::SourceSurface* aSurface) override;
+
+  BufferTextureData* AsBufferTextureData() override { return this; }
+
+  Maybe<gfx::IntSize> GetYSize() const;
+
+  Maybe<gfx::IntSize> GetCbCrSize() const;
+
+  Maybe<int32_t> GetYStride() const;
+
+  Maybe<int32_t> GetCbCrStride() const;
+
+  Maybe<gfx::YUVColorSpace> GetYUVColorSpace() const;
+
+  Maybe<gfx::ColorDepth> GetColorDepth() const;
+
+  Maybe<StereoMode> GetStereoMode() const;
+
+  Maybe<gfx::ChromaSubsampling> GetChromaSubsampling() const;
+
+  gfx::IntRect GetPictureRect() const;
+
+  gfx::IntSize GetSize() const;
+
+  gfx::SurfaceFormat GetFormat() const;
+
+  virtual size_t GetBufferSize() = 0;
+
+ protected:
+  static BufferTextureData* Create(
+      gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
+      gfx::BackendType aMoz2DBackend, LayersBackend aLayersBackend,
+      TextureFlags aFlags, TextureAllocationFlags aAllocFlags,
+      mozilla::ipc::IShmemAllocator* aAllocator, bool aIsSameProcess);
+
+  static BufferTextureData* CreateInternal(LayersIPCChannel* aAllocator,
+                                           const BufferDescriptor& aDesc,
+                                           gfx::BackendType aMoz2DBackend,
+                                           int32_t aBufferSize,
+                                           TextureFlags aTextureFlags);
+
+  virtual uint8_t* GetBuffer() = 0;
+
+  BufferTextureData(const BufferDescriptor& aDescriptor,
+                    gfx::BackendType aMoz2DBackend)
+      : mDescriptor(aDescriptor), mMoz2DBackend(aMoz2DBackend) {}
+
+  ~BufferTextureData() override = default;
+
+  BufferDescriptor mDescriptor;
+  gfx::BackendType mMoz2DBackend;
+};
+
+template <typename ShmemAllocator>
+inline BufferTextureData* BufferTextureData::Create(
+    gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
+    gfx::BackendType aMoz2DBackend, LayersBackend aLayersBackend,
+    TextureFlags aFlags, TextureAllocationFlags aAllocFlags,
+    ShmemAllocator aAllocator) {
+  return Create(aSize, aFormat, aMoz2DBackend, aLayersBackend, aFlags,
+                aAllocFlags, aAllocator, aAllocator->IsSameProcess());
+}
+
+// nullptr allocator specialization
+template <>
+inline BufferTextureData* BufferTextureData::Create(
+    gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
+    gfx::BackendType aMoz2DBackend, LayersBackend aLayersBackend,
+    TextureFlags aFlags, TextureAllocationFlags aAllocFlags, std::nullptr_t) {
+  return Create(aSize, aFormat, aMoz2DBackend, aLayersBackend, aFlags,
+                aAllocFlags, nullptr, true);
+}
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif