[poc] curve-filter

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

Index: third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp b/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
index 71f1aab4454813ffe452378c8de55d74052000fd..e8689fd07d4f3602dc1b20a88e7755173332b136 100644
--- a/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
+++ b/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
@@ -31,21 +31,28 @@
 #include "platform/TraceEvent.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/BitmapImageMetrics.h"
+#include "platform/graphics/ColorSpaceFilter.h"
+#include "platform/graphics/ColorSpaceProfile.h"
 #include "platform/graphics/DeferredImageDecoder.h"
+#include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/GraphicsScreen.h"
+#include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/ImageObserver.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColorFilter.h"
+#include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
 #include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 PassRefPtr<BitmapImage> BitmapImage::createWithOrientationForTesting(const SkBitmap& bitmap, ImageOrientation orientation)
 {
-    if (bitmap.isNull()) {
+    if (bitmap.isNull())
         return BitmapImage::create();
-    }
 
     RefPtr<BitmapImage> result = adoptRef(new BitmapImage(bitmap));
     result->m_frames[0].m_orientation = orientation;
@@ -69,6 +76,7 @@ BitmapImage::BitmapImage(ImageObserver* observer)
     , m_sizeAvailable(false)
     , m_hasUniformFrameSize(true)
     , m_haveFrameCount(false)
+    , m_drawingToCanvasElement(false)
 {
 }
 
@@ -86,6 +94,7 @@ BitmapImage::BitmapImage(const SkBitmap& bitmap, ImageObserver* observer)
     , m_haveSize(true)
     , m_sizeAvailable(true)
     , m_haveFrameCount(true)
+    , m_drawingToCanvasElement(false)
 {
     // Since we don't have a decoder, we can't figure out the image orientation.
     // Set m_sizeRespectingOrientation to be the same as m_size so it's not 0x0.
@@ -102,16 +111,6 @@ BitmapImage::~BitmapImage()
     stopAnimation();
 }
 
-bool BitmapImage::isBitmapImage() const
-{
-    return true;
-}
-
-bool BitmapImage::currentFrameHasSingleSecurityOrigin() const
-{
-    return true;
-}
-
 int BitmapImage::totalFrameBytes()
 {
     const size_t numFrames = frameCount();
@@ -142,9 +141,8 @@ void BitmapImage::destroyDecodedDataIfNecessary()
     for (size_t i = 0; i < m_frames.size(); ++i)
         allFrameBytes += m_frames[i].m_frameBytes;
 
-    if (allFrameBytes > cLargeAnimationCutoff) {
+    if (allFrameBytes > cLargeAnimationCutoff)
         destroyDecodedData(false);
-    }
 }
 
 void BitmapImage::destroyMetadataAndNotify(size_t frameBytesCleared)
@@ -161,7 +159,6 @@ void BitmapImage::cacheFrame(size_t index)
 
     int deltaBytes = totalFrameBytes();
 
-
     // We are caching frame snapshots.  This is OK even for partially decoded frames,
     // as they are cleared by dataChanged() when new data arrives.
     m_frames[index].m_frame = m_source.createFrameAtIndex(index);
@@ -269,22 +266,24 @@ void BitmapImage::draw(SkCanvas* canvas, const SkPaint& paint, const FloatRect&
 {
     TRACE_EVENT0("skia", "BitmapImage::draw");
 
-    RefPtr<SkImage> image = imageForCurrentFrame();
-    if (!image)
-        return; // It's too early and we don't have an image yet.
+    RefPtr<SkImage> skImage = imageForCurrentFrame();
+    if (!skImage)
+        return; // Bail: we don't have an image yet.
 
     FloatRect adjustedSrcRect = srcRect;
-    adjustedSrcRect.intersect(FloatRect(0, 0, image->width(), image->height()));
-
+    adjustedSrcRect.intersect(FloatRect(0, 0, skImage->width(), skImage->height()));
     if (adjustedSrcRect.isEmpty() || dstRect.isEmpty())
         return; // Nothing to draw.
+    FloatRect adjustedDstRect = dstRect;
 
     ImageOrientation orientation = DefaultImageOrientation;
     if (shouldRespectImageOrientation == RespectImageOrientation)
         orientation = frameOrientationAtIndex(m_currentFrame);
 
+    SkCanvas::SrcRectConstraint srcRectConstraint = WebCoreClampingModeToSkiaRectConstraint(clampMode);
+
     int initialSaveCount = canvas->getSaveCount();
-    FloatRect adjustedDstRect = dstRect;
+
     if (orientation != DefaultImageOrientation) {
         canvas->save();
 
@@ -301,14 +300,51 @@ void BitmapImage::draw(SkCanvas* canvas, const SkPaint& paint, const FloatRect&
         }
     }
 
-    SkRect skSrcRect = adjustedSrcRect;
-    canvas->drawImageRect(image.get(), skSrcRect, adjustedDstRect, &paint,
-        WebCoreClampingModeToSkiaRectConstraint(clampMode));
-    canvas->restoreToCount(initialSaveCount);
+    RefPtr<SkColorFilter> transform;
+    if (imageColorProfilesEnabled() && hasColorProfile())
+        transform = imageColorTransform();
+
+    if (!transform) {
+        canvas->drawImageRect(skImage.get(), adjustedSrcRect, adjustedDstRect, &paint, srcRectConstraint);
+
+        canvas->restoreToCount(initialSaveCount);
+        if (skImage->isLazyGenerated())
+            PlatformInstrumentation::didDrawLazyPixelRef(skImage->uniqueID());
+        this->didDraw();
+        return;
+    }
+
+    float srcArea = adjustedSrcRect.width() * adjustedSrcRect.height();
+    float dstArea = adjustedDstRect.width() * adjustedDstRect.height();
+
+    if (dstArea <= srcArea) {
+        SkPaint transformPaint = paint;
+        transformPaint.setColorFilter(transform.get());
+        canvas->drawImageRect(skImage.get(), adjustedSrcRect, adjustedDstRect, &transformPaint, srcRectConstraint);
+
+        canvas->restoreToCount(initialSaveCount);
+        if (skImage->isLazyGenerated())
+            PlatformInstrumentation::didDrawLazyPixelRef(skImage->uniqueID());
+        this->didDraw();
+        return;
+    }
+
+    RefPtr<SkImage> image = skImage; // skImage might be indirectly drawn here (due to transforms).
 
-    if (currentFrameIsLazyDecoded())
-        PlatformInstrumentation::didDrawLazyPixelRef(image->uniqueID());
+    if (RefPtr<SkImageFilter> imageFilter = adoptRef(SkColorFilterImageFilter::Create(transform.get())))
+        image = adoptRef(image->applyFilter(imageFilter.get(), nullptr, true));
 
+    canvas->drawImageRect(image.get(), adjustedSrcRect, adjustedDstRect, &paint, srcRectConstraint);
+
+    canvas->restoreToCount(initialSaveCount);
+    if (skImage->isLazyGenerated())
+        PlatformInstrumentation::didDrawLazyPixelRef(skImage->uniqueID());
+    this->didDraw();
+    return;
+}
+
+void BitmapImage::didDraw()
+{
     if (ImageObserver* observer = imageObserver())
         observer->didDraw(this);
 
@@ -398,6 +434,16 @@ PassRefPtr<Image> BitmapImage::imageForDefaultFrame()
     return Image::imageForDefaultFrame();
 }
 
+PassRefPtr<SkColorFilter> BitmapImage::imageColorTransform()
+{
+    if (currentScreenId()) // FIXME: remove these <canvas> code asserts.
+        RELEASE_ASSERT(!drawingToCanvasElement());
+    else
+        RELEASE_ASSERT(drawingToCanvasElement()); // sRGB render target.
+
+    return createColorSpaceFilter(colorProfile().get(), screenColorProfile(currentScreenId()).get());
+}
+
 bool BitmapImage::frameHasAlphaAtIndex(size_t index)
 {
     if (m_frames.size() <= index)
@@ -416,6 +462,7 @@ bool BitmapImage::currentFrameKnownToBeOpaque(MetadataMode metadataMode)
         // chance of an accurate answer, pre-cache the current frame metadata.
         frameAtIndex(currentFrame());
     }
+
     return !frameHasAlphaAtIndex(currentFrame());
 }