bitmap_content_layer_updater.cc revision effb81e5f8246d0db0270817048dc992db66e9fb 
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#include "cc/resources/bitmap_content_layer_updater.h"
6
7#include "cc/debug/devtools_instrumentation.h"
8#include "cc/debug/rendering_stats_instrumentation.h"
9#include "cc/resources/layer_painter.h"
10#include "cc/resources/prioritized_resource.h"
11#include "cc/resources/resource_update.h"
12#include "cc/resources/resource_update_queue.h"
13#include "skia/ext/platform_canvas.h"
14
15namespace cc {
16
17BitmapContentLayerUpdater::Resource::Resource(
18    BitmapContentLayerUpdater* updater,
19    scoped_ptr<PrioritizedResource> texture)
20    : LayerUpdater::Resource(texture.Pass()), updater_(updater) {}
21
22BitmapContentLayerUpdater::Resource::~Resource() {}
23
24void BitmapContentLayerUpdater::Resource::Update(
25    ResourceUpdateQueue* queue,
26    const gfx::Rect& source_rect,
27    const gfx::Vector2d& dest_offset,
28    bool partial_update) {
29  updater_->UpdateTexture(
30      queue, texture(), source_rect, dest_offset, partial_update);
31}
32
33scoped_refptr<BitmapContentLayerUpdater> BitmapContentLayerUpdater::Create(
34    scoped_ptr<LayerPainter> painter,
35    RenderingStatsInstrumentation* stats_instrumentation,
36    int layer_id) {
37  return make_scoped_refptr(
38      new BitmapContentLayerUpdater(painter.Pass(),
39                                    stats_instrumentation,
40                                    layer_id));
41}
42
43BitmapContentLayerUpdater::BitmapContentLayerUpdater(
44    scoped_ptr<LayerPainter> painter,
45    RenderingStatsInstrumentation* stats_instrumentation,
46    int layer_id)
47    : ContentLayerUpdater(painter.Pass(), stats_instrumentation, layer_id) {}
48
49BitmapContentLayerUpdater::~BitmapContentLayerUpdater() {}
50
51scoped_ptr<LayerUpdater::Resource> BitmapContentLayerUpdater::CreateResource(
52    PrioritizedResourceManager* manager) {
53  return scoped_ptr<LayerUpdater::Resource>(
54      new Resource(this, PrioritizedResource::Create(manager)));
55}
56
57void BitmapContentLayerUpdater::PrepareToUpdate(
58    const gfx::Rect& content_rect,
59    const gfx::Size& tile_size,
60    float contents_width_scale,
61    float contents_height_scale,
62    gfx::Rect* resulting_opaque_rect) {
63  if (canvas_size_ != content_rect.size()) {
64    devtools_instrumentation::ScopedLayerTask paint_setup(
65        devtools_instrumentation::kPaintSetup, layer_id_);
66    canvas_size_ = content_rect.size();
67    bitmap_backing_.allocN32Pixels(
68        canvas_size_.width(), canvas_size_.height(), layer_is_opaque_);
69    canvas_ = skia::AdoptRef(new SkCanvas(bitmap_backing_));
70  }
71
72  base::TimeTicks start_time =
73      rendering_stats_instrumentation_->StartRecording();
74  PaintContents(canvas_.get(),
75                content_rect.origin(),
76                contents_width_scale,
77                contents_height_scale,
78                resulting_opaque_rect);
79  base::TimeDelta duration =
80      rendering_stats_instrumentation_->EndRecording(start_time);
81  rendering_stats_instrumentation_->AddPaint(
82      duration,
83      content_rect.width() * content_rect.height());
84}
85
86void BitmapContentLayerUpdater::UpdateTexture(ResourceUpdateQueue* queue,
87                                              PrioritizedResource* texture,
88                                              const gfx::Rect& source_rect,
89                                              const gfx::Vector2d& dest_offset,
90                                              bool partial_update) {
91  CHECK(canvas_);
92  ResourceUpdate upload = ResourceUpdate::Create(texture,
93                                                 &bitmap_backing_,
94                                                 content_rect(),
95                                                 source_rect,
96                                                 dest_offset);
97  if (partial_update)
98    queue->AppendPartialUpload(upload);
99  else
100    queue->AppendFullUpload(upload);
101}
102
103void BitmapContentLayerUpdater::ReduceMemoryUsage() {
104  canvas_.clear();
105  canvas_size_ = gfx::Size();
106}
107
108void BitmapContentLayerUpdater::SetOpaque(bool opaque) {
109  if (opaque != layer_is_opaque_) {
110    canvas_.clear();
111    canvas_size_ = gfx::Size();
112  }
113
114  ContentLayerUpdater::SetOpaque(opaque);
115}
116
117}  // namespace cc
118