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.
6 #ifndef LayerTextureUpdater_h
7 #define LayerTextureUpdater_h
9 #if USE(ACCELERATED_COMPOSITING)
11 #include "CCPrioritizedTexture.h"
12 #include "GraphicsTypes3D.h"
13 #include <wtf/RefCounted.h>
20 struct CCRenderingStats
;
22 class LayerTextureUpdater
: public RefCounted
<LayerTextureUpdater
> {
24 // Allows texture uploaders to store per-tile resources.
27 virtual ~Texture() { }
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;
34 explicit Texture(PassOwnPtr
<CCPrioritizedTexture
> texture
) : m_texture(texture
) { }
37 OwnPtr
<CCPrioritizedTexture
> m_texture
;
40 virtual ~LayerTextureUpdater() { }
42 enum SampledTexelFormat
{
43 SampledTexelFormatRGBA
,
44 SampledTexelFormatBGRA
,
45 SampledTexelFormatInvalid
,
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
&) { }
57 // Set true by the layer when it is known that the entire output is going to be opaque.
58 virtual void setOpaque(bool) { }
61 } // namespace WebCore
62 #endif // USE(ACCELERATED_COMPOSITING)
63 #endif // LayerTextureUpdater_h