[poc] curve-filter

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

Index: third_party/WebKit/Source/platform/graphics/Gradient.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/Gradient.cpp b/third_party/WebKit/Source/platform/graphics/Gradient.cpp
index 9736e023b34a5b6db7b8510a48288c9f8ecedcb6..74a2c25f1289f9770ff843b62d10c96172d98904 100644
--- a/third_party/WebKit/Source/platform/graphics/Gradient.cpp
+++ b/third_party/WebKit/Source/platform/graphics/Gradient.cpp
@@ -28,9 +28,13 @@
 #include "platform/graphics/Gradient.h"
 
 #include "platform/geometry/FloatRect.h"
+#include "platform/graphics/ColorSpaceFilter.h"
+#include "platform/graphics/ColorSpaceProfile.h"
 #include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/GraphicsScreen.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include <algorithm>
@@ -251,14 +255,35 @@ SkShader* Gradient::shader()
         // use last color, since our "geometry" was degenerate (e.g. radius==0)
         m_gradient = adoptRef(SkShader::CreateColorShader(colors[countUsed - 1]));
     }
+
     return m_gradient.get();
 }
 
 void Gradient::applyToPaint(SkPaint& paint)
 {
-    paint.setShader(shader());
+    if (!imageColorProfilesEnabled()) {
+        applyShaderToPaintInternal(shader(), paint);
+        return;
+    }
+
+    RELEASE_ASSERT(currentScreenId());
+
+    // FIXME: the default color transform sRGB->screen is hot: Find a way to cache it. Add API to retrieve it.
+
+    RefPtr<SkColorFilter> colorTransform = createColorSpaceFilter(screenColorProfile(ScreenDevice::sRGB).get(), screenColorProfile(currentScreenId()).get());
+    if (!colorTransform) {
+        applyShaderToPaintInternal(shader(), paint);
+        return;
+    }
+
+    RefPtr<SkShader> transformShader = adoptRef(shader()->newWithColorFilter(colorTransform.get()));
+    if (!transformShader) {
+        applyShaderToPaintInternal(shader(), paint);
+        return;
+    }
 
-    // Legacy behavior: gradients are always dithered.
-    paint.setDither(true);
+    // Optionally, find a way to cache the color transformed paint shader too.
+    applyShaderToPaintInternal(transformShader.get(), paint);
 }
+
 } // namespace blink