cc/resources/image_layer_updater.cc

   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/image_layer_updater.h"
   6 #include "cc/resources/prioritized_resource.h"
   7 #include "cc/resources/resource_update_queue.h"
   8
   9 namespace cc {
  10
  11 ImageLayerUpdater::Resource::Resource(ImageLayerUpdater* updater,
  12                                       scoped_ptr<PrioritizedResource> texture)
  13     : LayerUpdater::Resource(texture.Pass()), updater_(updater) {}
  14
  15 ImageLayerUpdater::Resource::~Resource() {}
  16
  17 void ImageLayerUpdater::Resource::Update(ResourceUpdateQueue* queue,
  18                                          const gfx::Rect& source_rect,
  19                                          const gfx::Vector2d& dest_offset,
  20                                          bool partial_update) {
  21   updater_->UpdateTexture(
  22       queue, texture(), source_rect, dest_offset, partial_update);
  23 }
  24
  25 // static
  26 scoped_refptr<ImageLayerUpdater> ImageLayerUpdater::Create() {
  27   return make_scoped_refptr(new ImageLayerUpdater());
  28 }
  29
  30 scoped_ptr<LayerUpdater::Resource> ImageLayerUpdater::CreateResource(
  31     PrioritizedResourceManager* manager) {
  32   return make_scoped_ptr(
  33       new Resource(this, PrioritizedResource::Create(manager)));
  34 }
  35
  36 void ImageLayerUpdater::UpdateTexture(ResourceUpdateQueue* queue,
  37                                       PrioritizedResource* texture,
  38                                       const gfx::Rect& source_rect,
  39                                       const gfx::Vector2d& dest_offset,
  40                                       bool partial_update) {
  41   // Source rect should never go outside the image pixels, even if this
  42   // is requested because the texture extends outside the image.
  43   gfx::Rect clipped_source_rect = source_rect;
  44   gfx::Rect image_rect = gfx::Rect(0, 0, bitmap_.width(), bitmap_.height());
  45   clipped_source_rect.Intersect(image_rect);
  46
  47   gfx::Vector2d clipped_dest_offset =
  48       dest_offset +
  49       gfx::Vector2d(clipped_source_rect.origin() - source_rect.origin());
  50
  51   ResourceUpdate upload = ResourceUpdate::Create(
  52       texture, &bitmap_, image_rect, clipped_source_rect, clipped_dest_offset);
  53   if (partial_update)
  54     queue->AppendPartialUpload(upload);
  55   else
  56     queue->AppendFullUpload(upload);
  57 }
  58
  59 void ImageLayerUpdater::SetBitmap(const SkBitmap& bitmap) {
  60   DCHECK(bitmap.pixelRef());
  61   bitmap_ = bitmap;
  62 }
  63
  64 bool ImageLayerUpdater::UsingBitmap(const SkBitmap& bitmap) const {
  65   return bitmap.pixelRef() == bitmap_.pixelRef();
  66 }
  67
  68 }  // namespace cc