Move logic from NativeImageSkia to GraphicsContext and SkiaUtils

Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
 #include "config.h"
 #include "platform/graphics/GraphicsContext.h"
 
 #include "platform/TraceEvent.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/RoundedRect.h"
 #include "platform/graphics/BitmapImage.h"
 #include "platform/graphics/DisplayList.h"
 #include "platform/graphics/Gradient.h"
 #include "platform/graphics/ImageBuffer.h"
+#include "platform/graphics/skia/SkiaUtils.h"
 #include "platform/text/BidiResolver.h"
 #include "platform/text/TextRunIterator.h"
 #include "platform/weborigin/KURL.h"
 #include "third_party/skia/include/core/SkAnnotation.h"
 #include "third_party/skia/include/core/SkClipStack.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkDevice.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/core/SkRRect.h"
@@ skipping 343 matching lines @@
     return shouldSmoothFonts();
 }
 
 void GraphicsContext::setCompositeOperation(CompositeOperator compositeOperation, WebBlendMode blendMode)
 {
     if (contextDisabled())
         return;
     mutableState()->setCompositeOperation(compositeOperation, blendMode);
 }
 
-SkColorFilter* GraphicsContext::colorFilter()
+SkColorFilter* GraphicsContext::colorFilter() const
 {
     return immutableState()->colorFilter();
 }
 
 void GraphicsContext::setColorFilter(ColorFilter colorFilter)
 {
     GraphicsContextState* stateToSet = mutableState();
 
     // We only support one active color filter at the moment. If (when) this becomes a problem,
     // we should switch to using color filter chains (Skia work in progress).
@@ skipping 1438 matching lines @@
 #endif
 
 void GraphicsContext::didDrawTextInRect(const SkRect& textRect)
 {
     if (m_trackTextRegion) {
         TRACE_EVENT0("skia", "GraphicsContext::didDrawTextInRect");
         m_textRegion.join(textRect);
     }
 }
 
+void GraphicsContext::preparePaint(
+    SkPaint* paint,
+    const SkRect& srcRect,
+    const SkRect& destRect,
+    CompositeOperator compositeOp,
+    blink::WebBlendMode blendMode,
+    bool isLazyDecoded) const
+{
+    paint->setXfermode(WebCoreCompositeToSkiaComposite(compositeOp, blendMode).get());
+    paint->setColorFilter(this->colorFilter());
+    paint->setAlpha(this->getNormalizedAlpha());
+    paint->setLooper(this->drawLooper());
+    paint->setAntiAlias(shouldDrawAntiAliased(this, destRect));
+
+    InterpolationQuality resampling;
+    if (this->isAccelerated()) {
+        resampling = InterpolationLow;
+    } else if (this->printing()) {
+        resampling = InterpolationNone;
+    } else if (isLazyDecoded) {
+        resampling = InterpolationHigh;
+    } else {
+        // Take into account scale applied to the canvas when computing sampling mode (e.g. CSS scale or page scale).
+        SkRect destRectTarget = destRect;
+        SkMatrix totalMatrix = this->getTotalMatrix();
+        if (!(totalMatrix.getType() & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)))
+            totalMatrix.mapRect(&destRectTarget, destRect);
+
+        resampling = computeInterpolationQuality(totalMatrix,
+            SkScalarToFloat(srcRect.width()), SkScalarToFloat(srcRect.height()),
+            SkScalarToFloat(destRectTarget.width()), SkScalarToFloat(destRectTarget.height()));
+    }
+
+    if (resampling == InterpolationNone) {
+        // FIXME: This is to not break tests (it results in the filter bitmap flag
+        // being set to true). We need to decide if we respect InterpolationNone
+        // being returned from computeInterpolationQuality.
+        resampling = InterpolationLow;
+    }
+    resampling = limitInterpolationQuality(this, resampling);
+
+    bool useBicubicFilter = resampling == InterpolationHigh;
+    paint->setFilterLevel(convertToSkiaFilterLevel(useBicubicFilter, resampling));
 }
+
+}