tor-browser

The Tor Browser
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RenderExternalTextureHost.h (2516B)

      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_GFX_RENDEREXTERNALTEXTUREHOST_H
      8 #define MOZILLA_GFX_RENDEREXTERNALTEXTUREHOST_H
      9 
     10 #include "mozilla/layers/TextureHostOGL.h"
     11 #include "RenderTextureHostSWGL.h"
     12 
     13 namespace mozilla {
     14 namespace wr {
     15 
     16 /**
     17 * RenderExternalTextureHost manages external textures used by WebRender on Mac.
     18 * The motivation for this is to be able to use Apple Client Storage OpenGL
     19 * extension, which makes it possible to avoid some copies during texture
     20 * upload. This is especially helpful for high resolution video.
     21 */
     22 class RenderExternalTextureHost final : public RenderTextureHostSWGL {
     23 public:
     24  RenderExternalTextureHost(uint8_t* aBuffer,
     25                            const layers::BufferDescriptor& aDescriptor);
     26 
     27  wr::WrExternalImage Lock(uint8_t aChannelIndex, gl::GLContext* aGL) override;
     28  void Unlock() override;
     29  void PrepareForUse() override;
     30  size_t Bytes() override {
     31    return mSize.width * mSize.height * BytesPerPixel(mFormat);
     32  }
     33 
     34  // RenderTextureHostSWGL
     35  size_t GetPlaneCount() const override;
     36 
     37  gfx::SurfaceFormat GetFormat() const override;
     38 
     39  gfx::ColorDepth GetColorDepth() const override;
     40 
     41  gfx::YUVRangedColorSpace GetYUVColorSpace() const override;
     42 
     43  bool MapPlane(RenderCompositor* aCompositor, uint8_t aChannelIndex,
     44                PlaneInfo& aPlaneInfo) override;
     45 
     46  void UnmapPlanes() override;
     47 
     48 private:
     49  ~RenderExternalTextureHost();
     50 
     51  bool CreateSurfaces();
     52  void DeleteSurfaces();
     53  void DeleteTextures();
     54 
     55  uint8_t* GetBuffer() const { return mBuffer; }
     56  bool InitializeIfNeeded();
     57  bool IsReadyForDeletion();
     58  bool IsYUV() const { return mFormat == gfx::SurfaceFormat::YUV420; }
     59  size_t PlaneCount() const { return IsYUV() ? 3 : 1; }
     60  void UpdateTexture(size_t aIndex);
     61  void UpdateTextures();
     62 
     63  uint8_t* mBuffer;
     64  layers::BufferDescriptor mDescriptor;
     65 
     66  bool mInitialized;
     67  bool mTextureUpdateNeeded;
     68 
     69  gfx::IntSize mSize;
     70  gfx::SurfaceFormat mFormat;
     71 
     72  RefPtr<gl::GLContext> mGL;
     73  RefPtr<gfx::DataSourceSurface> mSurfaces[3];
     74  RefPtr<layers::DirectMapTextureSource> mTextureSources[3];
     75  wr::WrExternalImage mImages[3];
     76 };
     77 
     78 }  // namespace wr
     79 }  // namespace mozilla
     80 
     81 #endif  // MOZILLA_GFX_RENDEREXTERNALTEXTUREHOST_H