[poc] curve-filter

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

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * 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/ImageBufferSurface.h"
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/StaticBitmapImage.h"
+#include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkImage.h"
 
 class SkPicture;
 
 namespace blink {
 
 ImageBufferSurface::ImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
     : m_opacityMode(opacityMode)
     , m_size(size)
 {
     setIsHidden(false);
 }
 
 ImageBufferSurface::~ImageBufferSurface() { }
 
 PassRefPtr<SkPicture> ImageBufferSurface::getPicture()
 {
     return nullptr;
 }
 
 void ImageBufferSurface::clear()
 {
     // Clear the background transparent or opaque, as required. It would be nice if this wasn't
     // required, but the canvas is currently filled with the magic transparency
     // color. Can we have another way to manage this?
     if (isValid()) {
         if (m_opacityMode == Opaque) {
-            canvas()->clear(SK_ColorBLACK);
+            canvas()->clear(SK_ColorBLACK); // FIXME: not color correct.
         } else {
             canvas()->clear(SK_ColorTRANSPARENT);
         }
         didDraw(FloatRect(FloatPoint(0, 0), FloatSize(size())));
     }
 }
 
-void ImageBufferSurface::draw(GraphicsContext& context, const FloatRect& destRect, const FloatRect& srcRect, SkXfermode::Mode op)
+void ImageBufferSurface::draw(GraphicsContext& context, const FloatRect& destRect, const FloatRect& srcRect, SkXfermode::Mode op, SkColorFilter* transform)
 {
     RefPtr<SkImage> snapshot = newImageSnapshot(PreferNoAcceleration);
     if (!snapshot)
         return;
 
+    if (!transform) {
+        RefPtr<Image> image = StaticBitmapImage::create(snapshot.release());
+        context.drawImage(image.get(), destRect, srcRect, op);
+        return;
+    }
+
+    SkPaint transformPaint;
+    transformPaint.setColorFilter(transform);
+    transformPaint.setXfermodeMode(SkXfermode::kSrc_Mode);
+
+    SkPictureRecorder recorder;
+    FloatRect sourceRect = IntRect(0, 0, width(), height());
+    SkCanvas* canvas = recorder.beginRecording(sourceRect);
+    canvas->drawImage(snapshot.get(), 0, 0, &transformPaint);
+    RefPtr<SkPicture> recorded = adoptRef(recorder.endRecordingAsPicture());
+
+    SkISize size = SkISize::Make(width(), height());
+    snapshot = adoptRef(SkImage::NewFromPicture(recorded.get(), size, nullptr, nullptr));
+
     RefPtr<Image> image = StaticBitmapImage::create(snapshot.release());
     context.drawImage(image.get(), destRect, srcRect, op);
 }
 
 void ImageBufferSurface::flush()
 {
     canvas()->flush();
 }
 
 bool ImageBufferSurface::writePixels(const SkImageInfo& origInfo, const void* pixels, size_t rowBytes, int x, int y)
 {
     return canvas()->writePixels(origInfo, pixels, rowBytes, x, y);
 }
 
 } // namespace blink