tor-browser

The Tor Browser
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CanvasClient.h (2322B)

      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_CANVASCLIENT_H
      8 #define MOZILLA_GFX_CANVASCLIENT_H
      9 
     10 #include "mozilla/Assertions.h"                 // for MOZ_ASSERT, etc
     11 #include "mozilla/RefPtr.h"                     // for RefPtr, already_AddRefed
     12 #include "mozilla/layers/CompositableClient.h"  // for CompositableClient
     13 #include "mozilla/layers/CompositorTypes.h"     // for TextureInfo, etc
     14 #include "mozilla/layers/LayersSurfaces.h"      // for SurfaceDescriptor
     15 #include "mozilla/layers/TextureClient.h"       // for TextureClient, etc
     16 #include "mozilla/layers/PersistentBufferProvider.h"
     17 
     18 #include "mozilla/mozalloc.h"  // for operator delete
     19 
     20 #include "mozilla/gfx/Point.h"  // for IntSize
     21 #include "mozilla/gfx/Types.h"  // for SurfaceFormat
     22 
     23 namespace mozilla {
     24 namespace layers {
     25 
     26 class CompositableForwarder;
     27 
     28 /**
     29 * Compositable client for 2d and webgl canvas.
     30 */
     31 class CanvasClient final : public CompositableClient {
     32  int32_t mFrameID = 0;
     33  RefPtr<TextureClient> mFrontBuffer;
     34 
     35 public:
     36  /**
     37   * Creates, configures, and returns a new canvas client. If necessary, a
     38   * message will be sent to the compositor to create a corresponding image
     39   * host.
     40   */
     41  CanvasClient(CompositableForwarder* aFwd, const TextureFlags flags)
     42      : CompositableClient(aFwd, flags) {}
     43 
     44  virtual ~CanvasClient() = default;
     45 
     46  void Clear() { mFrontBuffer = nullptr; }
     47 
     48  bool AddTextureClient(TextureClient* aTexture) override {
     49    ++mFrameID;
     50    return CompositableClient::AddTextureClient(aTexture);
     51  }
     52 
     53  TextureInfo GetTextureInfo() const override {
     54    return TextureInfo(CompositableType::IMAGE, ImageUsageType::Canvas,
     55                       mTextureFlags);
     56  }
     57 
     58  void OnDetach() override { Clear(); }
     59 
     60  RefPtr<TextureClient> CreateTextureClientForCanvas(gfx::SurfaceFormat,
     61                                                     gfx::IntSize,
     62                                                     TextureFlags);
     63  void UseTexture(TextureClient*);
     64 };
     65 
     66 }  // namespace layers
     67 }  // namespace mozilla
     68 
     69 #endif