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 WebCore {
  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(OwnPtr<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     protected:
  34         explicit Texture(PassOwnPtr<CCPrioritizedTexture> texture) : m_texture(texture) { }
  35
  36     private:
  37         OwnPtr<CCPrioritizedTexture> m_texture;
  38     };
  39
  40     virtual ~LayerTextureUpdater() { }
  41
  42     enum SampledTexelFormat {
  43         SampledTexelFormatRGBA,
  44         SampledTexelFormatBGRA,
  45         SampledTexelFormatInvalid,
  46     };
  47     virtual PassOwnPtr<Texture> createTexture(CCPrioritizedTextureManager*) = 0;
  48     // Returns the format of the texel uploaded by this interface.
  49     // This format should not be confused by texture internal format.
  50     // This format specifies the component order in the sampled texel.
  51     // If the format is TexelFormatBGRA, vec4.x is blue and vec4.z is red.
  52     virtual SampledTexelFormat sampledTexelFormat(GC3Denum textureFormat) = 0;
  53     // The |resultingOpaqueRect| gives back a region of the layer that was painted opaque. If the layer is marked opaque in the updater,
  54     // then this region should be ignored in preference for the entire layer's area.
  55     virtual void prepareToUpdate(const IntRect& contentRect, const IntSize& tileSize, float contentsWidthScale, float contentsHeightScale, IntRect& resultingOpaqueRect, CCRenderingStats&) { }
  56
  57     // Set true by the layer when it is known that the entire output is going to be opaque.
  58     virtual void setOpaque(bool) { }
  59 };
  60
  61 } // namespace WebCore
  62 #endif // USE(ACCELERATED_COMPOSITING)
  63 #endif // LayerTextureUpdater_h