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     int layer_id) {
  36   return make_scoped_refptr(
  37       new BitmapContentLayerUpdater(painter.Pass(),
  38                                     layer_id));
  39 }
  40
  41 BitmapContentLayerUpdater::BitmapContentLayerUpdater(
  42     scoped_ptr<LayerPainter> painter,
  43     int layer_id)
  44     : ContentLayerUpdater(painter.Pass(), layer_id) {
  45 }
  46
  47 BitmapContentLayerUpdater::~BitmapContentLayerUpdater() {}
  48
  49 scoped_ptr<LayerUpdater::Resource> BitmapContentLayerUpdater::CreateResource(
  50     PrioritizedResourceManager* manager) {
  51   return make_scoped_ptr(
  52       new Resource(this, PrioritizedResource::Create(manager)));
  53 }
  54
  55 void BitmapContentLayerUpdater::PrepareToUpdate(const gfx::Size& content_size,
  56                                                 const gfx::Rect& paint_rect,
  57                                                 const gfx::Size& tile_size,
  58                                                 float contents_width_scale,
  59                                                 float contents_height_scale) {
  60   if (canvas_size_ != paint_rect.size()) {
  61     devtools_instrumentation::ScopedLayerTask paint_setup(
  62         devtools_instrumentation::kPaintSetup, layer_id_);
  63     canvas_size_ = paint_rect.size();
  64     bitmap_backing_.allocN32Pixels(
  65         canvas_size_.width(), canvas_size_.height(), layer_is_opaque_);
  66     // TODO(danak): Remove when skia does the check for us: crbug.com/360384
  67     canvas_ = skia::AdoptRef(new SkCanvas(bitmap_backing_));
  68     DCHECK_EQ(paint_rect.width(), canvas_->getBaseLayerSize().width());
  69     DCHECK_EQ(paint_rect.height(), canvas_->getBaseLayerSize().height());
  70   }
  71
  72   PaintContents(canvas_.get(),
  73                 content_size,
  74                 paint_rect,
  75                 contents_width_scale,
  76                 contents_height_scale);
  77 }
  78
  79 void BitmapContentLayerUpdater::UpdateTexture(ResourceUpdateQueue* queue,
  80                                               PrioritizedResource* texture,
  81                                               const gfx::Rect& source_rect,
  82                                               const gfx::Vector2d& dest_offset,
  83                                               bool partial_update) {
  84   CHECK(canvas_);
  85   ResourceUpdate upload = ResourceUpdate::Create(
  86       texture, &bitmap_backing_, paint_rect(), source_rect, dest_offset);
  87   if (partial_update)
  88     queue->AppendPartialUpload(upload);
  89   else
  90     queue->AppendFullUpload(upload);
  91 }
  92
  93 void BitmapContentLayerUpdater::ReduceMemoryUsage() {
  94   canvas_.clear();
  95   canvas_size_ = gfx::Size();
  96 }
  97
  98 void BitmapContentLayerUpdater::SetOpaque(bool opaque) {
  99   if (opaque != layer_is_opaque_) {
 100     canvas_.clear();
 101     canvas_size_ = gfx::Size();
 102   }
 103
 104   ContentLayerUpdater::SetOpaque(opaque);
 105 }
 106
 107 }  // namespace cc