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

Source/platform/graphics/GraphicsContextState.cpp

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/GraphicsContextState.h"
 
 namespace blink {
 
 GraphicsContextState::GraphicsContextState()
     : m_strokeColor(Color::black)
     , m_fillColor(Color::black)
     , 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);
 }
 
 GraphicsContextState::GraphicsContextState(const GraphicsContextState& other)
     : m_strokePaint(other.m_strokePaint)
     , m_fillPaint(other.m_fillPaint)
     , m_strokeData(other.m_strokeData)
     , m_strokeColor(other.m_strokeColor)
     , m_strokeGradient(other.m_strokeGradient)
     , m_strokePattern(other.m_strokePattern)
     , m_fillColor(other.m_fillColor)
     , 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)
 {
     this->~GraphicsContextState();
     new (this) GraphicsContextState(source);
 }
 
 const SkPaint& GraphicsContextState::strokePaint(int strokedPathLength) const
 {
     if (m_strokeGradient && m_strokeGradient->shaderChanged())
@@ skipping 18 matching lines @@
 {
     m_strokeData.setThickness(thickness);
     m_strokePaint.setStrokeWidth(SkFloatToScalar(thickness));
 }
 
 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);
 }
 
 void GraphicsContextState::setStrokeGradient(const PassRefPtr<Gradient> gradient, float alpha)
 {
     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());
 }
 
 void GraphicsContextState::setStrokePattern(const PassRefPtr<Pattern> pattern, float alpha)
 {
     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());
 }
 
 void GraphicsContextState::setLineCap(LineCap cap)
 {
     m_strokeData.setLineCap(cap);
     m_strokePaint.setStrokeCap((SkPaint::Cap)cap);
 }
 
 void GraphicsContextState::setLineJoin(LineJoin join)
 {
     m_strokeData.setLineJoin(join);
     m_strokePaint.setStrokeJoin((SkPaint::Join)join);
 }
 
 void GraphicsContextState::setMiterLimit(float miterLimit)
 {
     m_strokeData.setMiterLimit(miterLimit);
     m_strokePaint.setStrokeMiter(SkFloatToScalar(miterLimit));
 }
 
 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);
 }
 
 void GraphicsContextState::setFillGradient(const PassRefPtr<Gradient> gradient, float alpha)
 {
     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());
 }
 
 void GraphicsContextState::setFillPattern(const PassRefPtr<Pattern> pattern, float alpha)
 {
     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());
 }
 
 // Shadow. (This will need tweaking if we use draw loopers for other things.)
 void GraphicsContextState::setDrawLooper(PassRefPtr<SkDrawLooper> drawLooper)
 {
     m_looper = drawLooper;
     m_strokePaint.setLooper(m_looper.get());
     m_fillPaint.setLooper(m_looper.get());
 }
 
 void GraphicsContextState::clearDrawLooper()
 {
     m_looper.clear();
     m_strokePaint.setLooper(0);
     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);
 }
 
 void GraphicsContextState::setColorFilter(PassRefPtr<SkColorFilter> colorFilter)
 {
     m_colorFilter = colorFilter;
     m_strokePaint.setColorFilter(m_colorFilter.get());
     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;
     m_strokePaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(quality));
     m_fillPaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(quality));
 }
 
 void GraphicsContextState::setShouldAntialias(bool shouldAntialias)
 {
     m_shouldAntialias = shouldAntialias;
     m_strokePaint.setAntiAlias(shouldAntialias);
     m_fillPaint.setAntiAlias(shouldAntialias);
 }
 
 } // namespace blink