1 // Copyright 2012 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 #include "cc/resources/caching_bitmap_content_layer_updater.h"
6
7 #include "base/logging.h"
8 #include "cc/resources/layer_painter.h"
9 #include "skia/ext/platform_canvas.h"
10
11 namespace cc {
12
13 scoped_refptr<CachingBitmapContentLayerUpdater>
Create(scoped_ptr<LayerPainter> painter,RenderingStatsInstrumentation * stats_instrumentation,int layer_id)14 CachingBitmapContentLayerUpdater::Create(
15 scoped_ptr<LayerPainter> painter,
16 RenderingStatsInstrumentation* stats_instrumentation,
17 int layer_id) {
18 return make_scoped_refptr(
19 new CachingBitmapContentLayerUpdater(painter.Pass(),
20 stats_instrumentation,
21 layer_id));
22 }
23
CachingBitmapContentLayerUpdater(scoped_ptr<LayerPainter> painter,RenderingStatsInstrumentation * stats_instrumentation,int layer_id)24 CachingBitmapContentLayerUpdater::CachingBitmapContentLayerUpdater(
25 scoped_ptr<LayerPainter> painter,
26 RenderingStatsInstrumentation* stats_instrumentation,
27 int layer_id)
28 : BitmapContentLayerUpdater(painter.Pass(),
29 stats_instrumentation,
30 layer_id),
31 pixels_did_change_(false) {}
32
~CachingBitmapContentLayerUpdater()33 CachingBitmapContentLayerUpdater::~CachingBitmapContentLayerUpdater() {}
34
PrepareToUpdate(gfx::Rect content_rect,gfx::Size tile_size,float contents_width_scale,float contents_height_scale,gfx::Rect * resulting_opaque_rect)35 void CachingBitmapContentLayerUpdater::PrepareToUpdate(
36 gfx::Rect content_rect,
37 gfx::Size tile_size,
38 float contents_width_scale,
39 float contents_height_scale,
40 gfx::Rect* resulting_opaque_rect) {
41 BitmapContentLayerUpdater::PrepareToUpdate(content_rect,
42 tile_size,
43 contents_width_scale,
44 contents_height_scale,
45 resulting_opaque_rect);
46
47 const SkBitmap& new_bitmap = canvas_->getDevice()->accessBitmap(false);
48 SkAutoLockPixels lock(new_bitmap);
49 DCHECK_GT(new_bitmap.bytesPerPixel(), 0);
50 pixels_did_change_ = new_bitmap.config() != cached_bitmap_.config() ||
51 new_bitmap.height() != cached_bitmap_.height() ||
52 new_bitmap.width() != cached_bitmap_.width() ||
53 memcmp(new_bitmap.getPixels(),
54 cached_bitmap_.getPixels(),
55 new_bitmap.getSafeSize());
56
57 if (pixels_did_change_)
58 new_bitmap.deepCopyTo(&cached_bitmap_, new_bitmap.config());
59 }
60
61 } // namespace cc
62