cc/LayerTextureUpdater.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5
   6 #ifndef LayerTextureUpdater_h
   7 #define LayerTextureUpdater_h
   8
   9 #if USE(ACCELERATED_COMPOSITING)
  10
  11 #include "CCPrioritizedTexture.h"
  12 #include "GraphicsTypes3D.h"
  13 #include <wtf/RefCounted.h>
  14
  15 namespace cc {
  16
  17 class IntRect;
  18 class IntSize;
  19 class TextureManager;
  20 struct CCRenderingStats;
  21
  22 class LayerTextureUpdater : public RefCounted<LayerTextureUpdater> {
  23 public:
  24     // Allows texture uploaders to store per-tile resources.
  25     class Texture {
  26     public:
  27         virtual ~Texture();
  28
  29         CCPrioritizedTexture* texture() { return m_texture.get(); }
  30         void swapTextureWith(scoped_ptr<CCPrioritizedTexture>& texture) { m_texture.swap(texture); }
  31         virtual void prepareRect(const IntRect& /* sourceRect */, CCRenderingStats&) { }
  32         virtual void updateRect(CCResourceProvider*, const IntRect& sourceRect, const IntSize& destOffset) = 0;
  33         virtual bool backingResourceWasEvicted() const;
  34     protected:
  35         explicit Texture(scoped_ptr<CCPrioritizedTexture> texture);
  36
  37     private:
  38         scoped_ptr<CCPrioritizedTexture> m_texture;
  39     };
  40
  41     LayerTextureUpdater()
  42     {
  43         turnOffVerifier(); // In the component build we don't have WTF threading initialized in this DLL so the thread verifier explodes.
  44     }
  45
  46     virtual ~LayerTextureUpdater() { }
  47
  48     enum SampledTexelFormat {
  49         SampledTexelFormatRGBA,
  50         SampledTexelFormatBGRA,
  51         SampledTexelFormatInvalid,
  52     };
  53     virtual PassOwnPtr<Texture> createTexture(CCPrioritizedTextureManager*) = 0;
  54     // Returns the format of the texel uploaded by this interface.
  55     // This format should not be confused by texture internal format.
  56     // This format specifies the component order in the sampled texel.
  57     // If the format is TexelFormatBGRA, vec4.x is blue and vec4.z is red.
  58     virtual SampledTexelFormat sampledTexelFormat(GC3Denum textureFormat) = 0;
  59     // The |resultingOpaqueRect| gives back a region of the layer that was painted opaque. If the layer is marked opaque in the updater,
  60     // then this region should be ignored in preference for the entire layer's area.
  61     virtual void prepareToUpdate(const IntRect& contentRect, const IntSize& tileSize, float contentsWidthScale, float contentsHeightScale, IntRect& resultingOpaqueRect, CCRenderingStats&) { }
  62
  63     // Set true by the layer when it is known that the entire output is going to be opaque.
  64     virtual void setOpaque(bool) { }
  65 };
  66
  67 } // namespace cc
  68 #endif // USE(ACCELERATED_COMPOSITING)
  69 #endif // LayerTextureUpdater_h