[poc] curve-filter

cc/layers/picture_image_layer.cc

 // Copyright 2010 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/layers/picture_image_layer.h"
 
 #include <stddef.h>
 
 #include "cc/layers/picture_image_layer_impl.h"
 #include "cc/playback/display_item_list_settings.h"
 #include "cc/playback/drawing_display_item.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
+#include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 scoped_refptr<PictureImageLayer> PictureImageLayer::Create(
     const LayerSettings& settings) {
   return make_scoped_refptr(new PictureImageLayer(settings));
 }
 
 PictureImageLayer::PictureImageLayer(const LayerSettings& settings)
     : PictureLayer(settings, this) {
 }
 
 PictureImageLayer::~PictureImageLayer() {
   ClearClient();
 }
 
 scoped_ptr<LayerImpl> PictureImageLayer::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
   return PictureImageLayerImpl::Create(tree_impl, id(), is_mask());
 }
 
 bool PictureImageLayer::HasDrawableContent() const {
   return image_ && PictureLayer::HasDrawableContent();
 }
 
-void PictureImageLayer::SetImage(skia::RefPtr<const SkImage> image) {
+void PictureImageLayer::SetImage(skia::RefPtr<const SkImage> image,
+    skia::RefPtr<SkColorFilter> transform) {
+  // SetImage() may be called when color transforms change: usually
+  // the image has not changed, but its rendered paint should.
+  if (transform_.get() != transform.get()) {
+    transform_ = std::move(transform);
+    FilterOperations filters;
+    if (transform_.get()) {
+      skia::RefPtr<SkImageFilter> color_transform_filter =
+          skia::AdoptRef(SkColorFilterImageFilter::Create(transform_.get()));
+      FilterOperation color_transform_operation =
+          FilterOperation::CreateReferenceFilter(color_transform_filter);
+      filters.Append(color_transform_operation);
+    }
+    this->Layer::SetFilters(filters);
+  }
+
   // SetImage() currently gets called whenever there is any
   // style change that affects the layer even if that change doesn't
   // affect the actual contents of the image (e.g. a CSS animation).
   // With this check in place we avoid unecessary texture uploads.
   if (image_.get() == image.get())
     return;
 
   image_ = std::move(image);
   UpdateDrawsContent(HasDrawableContent());
   SetNeedsDisplay();
@@ skipping 42 matching lines @@
 
 bool PictureImageLayer::FillsBoundsCompletely() const {
   return false;
 }
 
 size_t PictureImageLayer::GetApproximateUnsharedMemoryUsage() const {
   return 0;
 }
 
 }  // namespace cc