[poc] curve-filter

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index bbb2640ffc9a99251b33a9ec563f03d235bea0c1..497f4189d30b15ba4c4f471828adf855ec87b267 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -35,9 +35,12 @@
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/BitmapImage.h"
+#include "platform/graphics/ColorSpaceFilter.h"
+#include "platform/graphics/ColorSpaceProfile.h"
 #include "platform/graphics/FirstPaintInvalidationTracking.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/GraphicsLayerFactory.h"
+#include "platform/graphics/GraphicsScreen.h"
 #include "platform/graphics/Image.h"
 #include "platform/graphics/LinkHighlight.h"
 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
@@ -1082,8 +1085,30 @@ void GraphicsLayer::setContentsToImage(Image* image, RespectImageOrientationEnum
 {
     RefPtr<SkImage> skImage = image ? image->imageForCurrentFrame() : nullptr;
 
-    if (image && skImage && image->isBitmapImage()) {
-        if (respectImageOrientation == RespectImageOrientation) {
+    RefPtr<SkColorFilter> colorTransform;
+
+    if (skImage && image->isBitmapImage()) {
+        RELEASE_ASSERT(currentScreenId()); // There should be an active graphics screen.
+
+        if (imageColorProfilesEnabled() && toBitmapImage(image)->hasColorProfile()) {
+            // FIXME: maybe pass the color transform filter to the layer so it gets applied on the GPU.
+            //   we now pass the colorTransform filter, which gets attached to our cc::Layer
+            //   as a cc::FilterOperation. Note: CSS filters on this <img> element excludes
+            //   this element from being in a layer. Thus, this filter passing method does
+            //   not break CSS filter style application on <img> elements.
+            // FIXME: In an experiment, I passed a SkColorCubeFilter to the GPU and that works. But note
+            // that SkColorCurveFilter does not: it gets dropped on floor somewhere after CC sends it to
+            // the GPU process (maybe because SkColorCurveFilter has float-16 textures, whereas
+            // SkColorCubeFilter does not?).
+            //   OIC, the GPU command buffer does not currently support GL_HALF_FLOAT
+            //   textures, bless their cotton socks.
+            if (RefPtr<ColorSpaceProfile> source = toBitmapImage(image)->colorProfile()) {
+                RefPtr<ColorSpaceProfile> target = screenColorProfile(currentScreenId());
+                colorTransform = createColorSpaceFilter(source.get(), target.get());
+            }
+        }
+
+        if (skImage && respectImageOrientation == RespectImageOrientation) {
             ImageOrientation imageOrientation = toBitmapImage(image)->currentFrameOrientation();
             skImage = DragImage::resizeAndOrientImage(skImage.release(), imageOrientation);
         }
@@ -1094,7 +1119,11 @@ void GraphicsLayer::setContentsToImage(Image* image, RespectImageOrientationEnum
             m_imageLayer = adoptPtr(Platform::current()->compositorSupport()->createImageLayer());
             registerContentsLayer(m_imageLayer->layer());
         }
-        m_imageLayer->setImage(skImage.get());
+        if (RefPtr<SkColorFilter> transform = colorSpaceFlattenableFilter(colorTransform.get())) {
+            m_imageLayer->setImage(skImage.get(), transform.get());
+        } else {
+            m_imageLayer->setImage(skImage.get(), nullptr);
+        }
         m_imageLayer->layer()->setOpaque(image->currentFrameKnownToBeOpaque());
         updateContentsRect();
     } else {