src/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 make_scoped_ptr(
  54       new Resource(this, PrioritizedResource::Create(manager)));
  55 }
  56
  57 void BitmapContentLayerUpdater::PrepareToUpdate(const gfx::Size& content_size,
  58                                                 const gfx::Rect& paint_rect,
  59                                                 const gfx::Size& tile_size,
  60                                                 float contents_width_scale,
  61                                                 float contents_height_scale) {
  62   if (canvas_size_ != paint_rect.size()) {
  63     devtools_instrumentation::ScopedLayerTask paint_setup(
  64         devtools_instrumentation::kPaintSetup, layer_id_);
  65     canvas_size_ = paint_rect.size();
  66     bitmap_backing_.allocN32Pixels(
  67         canvas_size_.width(), canvas_size_.height(), layer_is_opaque_);
  68     // TODO(danak): Remove when skia does the check for us: crbug.com/360384
  69     canvas_ = skia::AdoptRef(new SkCanvas(bitmap_backing_));
  70     DCHECK_EQ(paint_rect.width(), canvas_->getBaseLayerSize().width());
  71     DCHECK_EQ(paint_rect.height(), canvas_->getBaseLayerSize().height());
  72   }
  73
  74   base::TimeTicks start_time =
  75       rendering_stats_instrumentation_->StartRecording();
  76   PaintContents(canvas_.get(),
  77                 content_size,
  78                 paint_rect,
  79                 contents_width_scale,
  80                 contents_height_scale);
  81   base::TimeDelta duration =
  82       rendering_stats_instrumentation_->EndRecording(start_time);
  83   rendering_stats_instrumentation_->AddPaint(
  84       duration, paint_rect.width() * paint_rect.height());
  85 }
  86
  87 void BitmapContentLayerUpdater::UpdateTexture(ResourceUpdateQueue* queue,
  88                                               PrioritizedResource* texture,
  89                                               const gfx::Rect& source_rect,
  90                                               const gfx::Vector2d& dest_offset,
  91                                               bool partial_update) {
  92   CHECK(canvas_);
  93   ResourceUpdate upload = ResourceUpdate::Create(
  94       texture, &bitmap_backing_, paint_rect(), source_rect, dest_offset);
  95   if (partial_update)
  96     queue->AppendPartialUpload(upload);
  97   else
  98     queue->AppendFullUpload(upload);
  99 }
 100
 101 void BitmapContentLayerUpdater::ReduceMemoryUsage() {
 102   canvas_.clear();
 103   canvas_size_ = gfx::Size();
 104 }
 105
 106 void BitmapContentLayerUpdater::SetOpaque(bool opaque) {
 107   if (opaque != layer_is_opaque_) {
 108     canvas_.clear();
 109     canvas_size_ = gfx::Size();
 110   }
 111
 112   ContentLayerUpdater::SetOpaque(opaque);
 113 }
 114
 115 }  // namespace cc