cc/resources/bitmap_content_layer_updater.cc

   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
  15 namespace cc {
  16
  17 BitmapContentLayerUpdater::Resource::Resource(
  18     BitmapContentLayerUpdater* updater,
  19     scoped_ptr<PrioritizedResource> texture)
  20     : LayerUpdater::Resource(texture.Pass()), updater_(updater) {}
  21
  22 BitmapContentLayerUpdater::Resource::~Resource() {}
  23
  24 void 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
  33 scoped_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
  43 BitmapContentLayerUpdater::BitmapContentLayerUpdater(
  44     scoped_ptr<LayerPainter> painter,
  45     RenderingStatsInstrumentation* stats_instrumentation,
  46     int layer_id)
  47     : ContentLayerUpdater(painter.Pass(), stats_instrumentation, layer_id) {}
  48
  49 BitmapContentLayerUpdater::~BitmapContentLayerUpdater() {}
  50
  51 scoped_ptr<LayerUpdater::Resource> BitmapContentLayerUpdater::CreateResource(
  52     PrioritizedResourceManager* manager) {
  53   return scoped_ptr<LayerUpdater::Resource>(
  54       new Resource(this, PrioritizedResource::Create(manager)));
  55 }
  56
  57 void 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     bool alloc = bitmap_backing_.allocN32Pixels(
  68         canvas_size_.width(), canvas_size_.height(), layer_is_opaque_);
  69     // TODO(danak): Remove when skia does the check for us: crbug.com/360384
  70     CHECK(alloc);
  71     canvas_ = skia::AdoptRef(new SkCanvas(bitmap_backing_));
  72     DCHECK_EQ(content_rect.width(), canvas_->getBaseLayerSize().width());
  73     DCHECK_EQ(content_rect.height(), canvas_->getBaseLayerSize().height());
  74   }
  75
  76   base::TimeTicks start_time =
  77       rendering_stats_instrumentation_->StartRecording();
  78   PaintContents(canvas_.get(),
  79                 content_rect,
  80                 contents_width_scale,
  81                 contents_height_scale,
  82                 resulting_opaque_rect);
  83   base::TimeDelta duration =
  84       rendering_stats_instrumentation_->EndRecording(start_time);
  85   rendering_stats_instrumentation_->AddPaint(
  86       duration,
  87       content_rect.width() * content_rect.height());
  88 }
  89
  90 void BitmapContentLayerUpdater::UpdateTexture(ResourceUpdateQueue* queue,
  91                                               PrioritizedResource* texture,
  92                                               const gfx::Rect& source_rect,
  93                                               const gfx::Vector2d& dest_offset,
  94                                               bool partial_update) {
  95   CHECK(canvas_);
  96   ResourceUpdate upload = ResourceUpdate::Create(texture,
  97                                                  &bitmap_backing_,
  98                                                  content_rect(),
  99                                                  source_rect,
 100                                                  dest_offset);
 101   if (partial_update)
 102     queue->AppendPartialUpload(upload);
 103   else
 104     queue->AppendFullUpload(upload);
 105 }
 106
 107 void BitmapContentLayerUpdater::ReduceMemoryUsage() {
 108   canvas_.clear();
 109   canvas_size_ = gfx::Size();
 110 }
 111
 112 void BitmapContentLayerUpdater::SetOpaque(bool opaque) {
 113   if (opaque != layer_is_opaque_) {
 114     canvas_.clear();
 115     canvas_size_ = gfx::Size();
 116   }
 117
 118   ContentLayerUpdater::SetOpaque(opaque);
 119 }
 120
 121 }  // namespace cc