Removing the dependency on GraphicsContext for drawing images in 2D canvas

Source/platform/graphics/GraphicsContextState.cpp

Index: Source/platform/graphics/GraphicsContextState.cpp
diff --git a/Source/platform/graphics/GraphicsContextState.cpp b/Source/platform/graphics/GraphicsContextState.cpp
index 02ba5f1d43b6f848a666e903efa16864753e143b..d654ff0dcbd7a567738a177bda3372aed9f5f27d 100644
--- a/Source/platform/graphics/GraphicsContextState.cpp
+++ b/Source/platform/graphics/GraphicsContextState.cpp
@@ -12,22 +12,19 @@ GraphicsContextState::GraphicsContextState()
     , m_fillColor(Color::black)
     , m_fillRule(RULE_NONZERO)
     , m_textDrawingMode(TextModeFill)
-    , m_alpha(256)
-    , m_compositeOperation(SkXfermode::kSrcOver_Mode)
     , m_interpolationQuality(InterpolationDefault)
     , m_saveCount(0)
     , m_shouldAntialias(true)
-    , m_shouldClampToSourceRect(true)
 {
     m_strokePaint.setStyle(SkPaint::kStroke_Style);
     m_strokePaint.setStrokeWidth(SkFloatToScalar(m_strokeData.thickness()));
-    m_strokePaint.setColor(applyAlpha(m_strokeColor.rgb()));
+    m_strokePaint.setColor(m_strokeColor.rgb());
     m_strokePaint.setStrokeCap(SkPaint::kDefault_Cap);
     m_strokePaint.setStrokeJoin(SkPaint::kDefault_Join);
     m_strokePaint.setStrokeMiter(SkFloatToScalar(m_strokeData.miterLimit()));
     m_strokePaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(m_interpolationQuality));
     m_strokePaint.setAntiAlias(m_shouldAntialias);
-    m_fillPaint.setColor(applyAlpha(m_fillColor.rgb()));
+    m_fillPaint.setColor(m_fillColor.rgb());
     m_fillPaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(m_interpolationQuality));
     m_fillPaint.setAntiAlias(m_shouldAntialias);
 }
@@ -44,15 +41,11 @@ GraphicsContextState::GraphicsContextState(const GraphicsContextState& other)
     , m_fillGradient(other.m_fillGradient)
     , m_fillPattern(other.m_fillPattern)
     , m_looper(other.m_looper)
-    , m_dropShadowImageFilter(other.m_dropShadowImageFilter)
     , m_textDrawingMode(other.m_textDrawingMode)
-    , m_alpha(other.m_alpha)
     , m_colorFilter(other.m_colorFilter)
-    , m_compositeOperation(other.m_compositeOperation)
     , m_interpolationQuality(other.m_interpolationQuality)
     , m_saveCount(0)
-    , m_shouldAntialias(other.m_shouldAntialias)
-    , m_shouldClampToSourceRect(other.m_shouldClampToSourceRect) { }
+    , m_shouldAntialias(other.m_shouldAntialias) { }
 
 void GraphicsContextState::copy(const GraphicsContextState& source)
 {
@@ -91,7 +84,7 @@ void GraphicsContextState::setStrokeColor(const Color& color)
     m_strokeGradient.clear();
     m_strokePattern.clear();
     m_strokeColor = color;
-    m_strokePaint.setColor(applyAlpha(color.rgb()));
+    m_strokePaint.setColor(color.rgb());
     m_strokePaint.setShader(0);
 }
 
@@ -100,7 +93,7 @@ void GraphicsContextState::setStrokeGradient(const PassRefPtr<Gradient> gradient
     m_strokeColor = Color::black;
     m_strokePattern.clear();
     m_strokeGradient = gradient;
-    m_strokePaint.setColor(scaleAlpha(applyAlpha(SK_ColorBLACK), alpha));
+    m_strokePaint.setColor(scaleAlpha(SK_ColorBLACK, alpha));
     m_strokePaint.setShader(m_strokeGradient->shader());
 }
 
@@ -109,7 +102,7 @@ void GraphicsContextState::setStrokePattern(const PassRefPtr<Pattern> pattern, f
     m_strokeColor = Color::black;
     m_strokeGradient.clear();
     m_strokePattern = pattern;
-    m_strokePaint.setColor(scaleAlpha(applyAlpha(SK_ColorBLACK), alpha));
+    m_strokePaint.setColor(scaleAlpha(SK_ColorBLACK, alpha));
     m_strokePaint.setShader(m_strokePattern->shader());
 }
 
@@ -136,7 +129,7 @@ void GraphicsContextState::setFillColor(const Color& color)
     m_fillColor = color;
     m_fillGradient.clear();
     m_fillPattern.clear();
-    m_fillPaint.setColor(applyAlpha(color.rgb()));
+    m_fillPaint.setColor(color.rgb());
     m_fillPaint.setShader(0);
 }
 
@@ -145,7 +138,7 @@ void GraphicsContextState::setFillGradient(const PassRefPtr<Gradient> gradient,
     m_fillColor = Color::black;
     m_fillPattern.clear();
     m_fillGradient = gradient;
-    m_fillPaint.setColor(scaleAlpha(applyAlpha(SK_ColorBLACK), alpha));
+    m_fillPaint.setColor(scaleAlpha(SK_ColorBLACK, alpha));
     m_fillPaint.setShader(m_fillGradient->shader());
 }
 
@@ -154,7 +147,7 @@ void GraphicsContextState::setFillPattern(const PassRefPtr<Pattern> pattern, flo
     m_fillColor = Color::black;
     m_fillGradient.clear();
     m_fillPattern = pattern;
-    m_fillPaint.setColor(scaleAlpha(applyAlpha(SK_ColorBLACK), alpha));
+    m_fillPaint.setColor(scaleAlpha(SK_ColorBLACK, alpha));
     m_fillPaint.setShader(m_fillPattern->shader());
 }
 
@@ -173,23 +166,6 @@ void GraphicsContextState::clearDrawLooper()
     m_fillPaint.setLooper(0);
 }
 
-void GraphicsContextState::setDropShadowImageFilter(PassRefPtr<SkImageFilter> dropShadowImageFilter)
-{
-    m_dropShadowImageFilter = dropShadowImageFilter;
-}
-
-void GraphicsContextState::clearDropShadowImageFilter()
-{
-    m_dropShadowImageFilter.clear();
-}
-
-void GraphicsContextState::setAlphaAsFloat(float alpha)
-{
-    m_alpha = clampedAlphaForBlending(alpha);
-    m_strokePaint.setColor(applyAlpha(m_strokeColor.rgb()));
-    m_fillPaint.setColor(applyAlpha(m_fillColor.rgb()));
-}
-
 void GraphicsContextState::setLineDash(const DashArray& dashes, float dashOffset)
 {
     m_strokeData.setLineDash(dashes, dashOffset);
@@ -202,13 +178,6 @@ void GraphicsContextState::setColorFilter(PassRefPtr<SkColorFilter> colorFilter)
     m_fillPaint.setColorFilter(m_colorFilter.get());
 }
 
-void GraphicsContextState::setCompositeOperation(SkXfermode::Mode xferMode)
-{
-    m_compositeOperation = xferMode;
-    m_strokePaint.setXfermodeMode(xferMode);
-    m_fillPaint.setXfermodeMode(xferMode);
-}
-
 void GraphicsContextState::setInterpolationQuality(InterpolationQuality quality)
 {
     m_interpolationQuality = quality;