[poc] curve-filter

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 10 matching lines @@
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #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>
 
 typedef Vector<SkScalar, 8> ColorStopOffsetVector;
 typedef Vector<SkColor, 8> ColorStopColorVector;
 
 namespace blink {
 
 Gradient::Gradient(const FloatPoint& p0, const FloatPoint& p1)
@@ skipping 200 matching lines @@
     } else {
         SkPoint pts[2] = { m_p0.data(), m_p1.data() };
         SkMatrix localMatrix = affineTransformToSkMatrix(m_gradientSpaceTransformation);
         m_gradient = adoptRef(SkGradientShader::CreateLinear(pts, colors.data(), pos.data(), static_cast<int>(countUsed), tile, shouldDrawInPMColorSpace, &localMatrix));
     }
 
     if (!m_gradient) {
         // 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;
+    }
 
-    // Legacy behavior: gradients are always dithered.
-    paint.setDither(true);
+    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;
+    }
+
+    // Optionally, find a way to cache the color transformed paint shader too.
+    applyShaderToPaintInternal(transformShader.get(), paint);
 }
+
 } // namespace blink