1 files changed, 68 insertions, 0 deletions
diff --git a/chromium/cc/resources/image_layer_updater.cc b/chromium/cc/resources/image_layer_updater.cc
new file mode 100644
index 00000000000..470f518b424
--- /dev/null
+++ b/chromium/cc/resources/image_layer_updater.cc
@@ -0,0 +1,68 @@
+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/resources/image_layer_updater.h"
+#include "cc/resources/prioritized_resource.h"
+#include "cc/resources/resource_update_queue.h"
+
+namespace cc {
+
+ImageLayerUpdater::Resource::Resource(ImageLayerUpdater* updater,
+                                      scoped_ptr<PrioritizedResource> texture)
+    : LayerUpdater::Resource(texture.Pass()), updater_(updater) {}
+
+ImageLayerUpdater::Resource::~Resource() {}
+
+void ImageLayerUpdater::Resource::Update(ResourceUpdateQueue* queue,
+                                         gfx::Rect source_rect,
+                                         gfx::Vector2d dest_offset,
+                                         bool partial_update) {
+  updater_->UpdateTexture(
+      queue, texture(), source_rect, dest_offset, partial_update);
+}
+
+// static
+scoped_refptr<ImageLayerUpdater> ImageLayerUpdater::Create() {
+  return make_scoped_refptr(new ImageLayerUpdater());
+}
+
+scoped_ptr<LayerUpdater::Resource> ImageLayerUpdater::CreateResource(
+    PrioritizedResourceManager* manager) {
+  return scoped_ptr<LayerUpdater::Resource>(
+      new Resource(this, PrioritizedResource::Create(manager)));
+}
+
+void ImageLayerUpdater::UpdateTexture(ResourceUpdateQueue* queue,
+                                      PrioritizedResource* texture,
+                                      gfx::Rect source_rect,
+                                      gfx::Vector2d dest_offset,
+                                      bool partial_update) {
+  // Source rect should never go outside the image pixels, even if this
+  // is requested because the texture extends outside the image.
+  gfx::Rect clipped_source_rect = source_rect;
+  gfx::Rect image_rect = gfx::Rect(0, 0, bitmap_.width(), bitmap_.height());
+  clipped_source_rect.Intersect(image_rect);
+
+  gfx::Vector2d clipped_dest_offset =
+      dest_offset +
+      gfx::Vector2d(clipped_source_rect.origin() - source_rect.origin());
+
+  ResourceUpdate upload = ResourceUpdate::Create(
+      texture, &bitmap_, image_rect, clipped_source_rect, clipped_dest_offset);
+  if (partial_update)
+    queue->AppendPartialUpload(upload);
+  else
+    queue->AppendFullUpload(upload);
+}
+
+void ImageLayerUpdater::SetBitmap(const SkBitmap& bitmap) {
+  DCHECK(bitmap.pixelRef());
+  bitmap_ = bitmap;
+}
+
+bool ImageLayerUpdater::UsingBitmap(const SkBitmap& bitmap) const {
+  return bitmap.pixelRef() == bitmap_.pixelRef();
+}
+
+}  // namespace cc