root/Source/platform/graphics/GraphicsContextState.cpp

DEFINITIONS

1. m_shouldClampToSourceRect
2. copy
3. strokePaint
4. fillPaint
5. setStrokeStyle
6. setStrokeThickness
7. setStrokeColor
8. setStrokeGradient
9. clearStrokeGradient
10. setStrokePattern
11. clearStrokePattern
12. setLineCap
13. setLineJoin
14. setMiterLimit
15. setFillColor
16. setFillGradient
17. clearFillGradient
18. setFillPattern
19. clearFillPattern
20. setDrawLooper
21. clearDrawLooper
22. setAlphaAsFloat
23. setLineDash
24. setColorFilter
25. setCompositeOperation
26. setInterpolationQuality
27. setShouldAntialias

// 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 WebCore {

GraphicsContextState::GraphicsContextState()
    : m_fillColor(Color::black)
    , m_fillRule(RULE_NONZERO)
    , m_textDrawingMode(TextModeFill)
    , m_alpha(256)
    , m_xferMode(nullptr)
    , m_compositeOperator(CompositeSourceOver)
    , m_blendMode(blink::WebBlendModeNormal)
    , m_interpolationQuality(InterpolationDefault)
    , m_saveCount(0)
    , m_shouldAntialias(true)
    , m_shouldSmoothFonts(true)
    , m_shouldClampToSourceRect(true)
{
    m_strokePaint.setStyle(SkPaint::kStroke_Style);
    m_strokePaint.setStrokeWidth(SkFloatToScalar(m_strokeData.thickness()));
    m_strokePaint.setColor(applyAlpha(m_strokeData.color().rgb()));
    m_strokePaint.setStrokeCap(SkPaint::kDefault_Cap);
    m_strokePaint.setStrokeJoin(SkPaint::kDefault_Join);
    m_strokePaint.setStrokeMiter(SkFloatToScalar(m_strokeData.miterLimit()));
    m_strokePaint.setFilterBitmap(m_interpolationQuality != InterpolationNone);
    m_strokePaint.setAntiAlias(m_shouldAntialias);
    m_fillPaint.setColor(applyAlpha(m_fillColor.rgb()));
    m_fillPaint.setFilterBitmap(m_interpolationQuality != InterpolationNone);
    m_fillPaint.setAntiAlias(m_shouldAntialias);
}

void GraphicsContextState::copy(GraphicsContextState* source)
{
    m_strokePaint = source->m_strokePaint;
    m_fillPaint = source->m_fillPaint;
    m_strokeData = source->m_strokeData;
    m_fillColor = source->m_fillColor;
    m_fillRule = source->m_fillRule;
    m_fillGradient = source->m_fillGradient;
    m_fillPattern = source->m_fillPattern;
    m_looper = source->m_looper;
    m_textDrawingMode = source->m_textDrawingMode;
    m_alpha = source->m_alpha;
    m_xferMode = source->m_xferMode;
    m_colorFilter = source->m_colorFilter;
    m_compositeOperator = source->m_compositeOperator;
    m_blendMode = source->m_blendMode;
    m_interpolationQuality = source->m_interpolationQuality;
    m_saveCount = 0;
    m_shouldAntialias = source->m_shouldAntialias;
    m_shouldSmoothFonts = source->m_shouldSmoothFonts;
    m_shouldClampToSourceRect = source->m_shouldClampToSourceRect;
}

const SkPaint& GraphicsContextState::strokePaint(int strokedPathLength) const
{
    if (m_strokeData.gradient() && m_strokeData.gradient()->shaderChanged())
        m_strokePaint.setShader(m_strokeData.gradient()->shader());
    m_strokeData.setupPaintDashPathEffect(&m_strokePaint, strokedPathLength);
    return m_strokePaint;
}

const SkPaint& GraphicsContextState::fillPaint() const
{
    if (m_fillGradient && m_fillGradient->shaderChanged())
        m_fillPaint.setShader(m_fillGradient->shader());
    return m_fillPaint;
}

void GraphicsContextState::setStrokeStyle(StrokeStyle style)
{
    m_strokeData.setStyle(style);
}

void GraphicsContextState::setStrokeThickness(float thickness)
{
    m_strokeData.setThickness(thickness);
    m_strokePaint.setStrokeWidth(SkFloatToScalar(thickness));
}

void GraphicsContextState::setStrokeColor(const Color& color)
{
    m_strokeData.clearGradient();
    m_strokeData.clearPattern();
    m_strokeData.setColor(color);
    m_strokePaint.setColor(applyAlpha(color.rgb()));
    m_strokePaint.setShader(0);
}

void GraphicsContextState::setStrokeGradient(const PassRefPtr<Gradient> gradient)
{
    m_strokeData.setColor(Color::black);
    m_strokeData.clearPattern();
    m_strokeData.setGradient(gradient);
    m_strokePaint.setColor(applyAlpha(SK_ColorBLACK));
    m_strokePaint.setShader(m_strokeData.gradient()->shader());
}

void GraphicsContextState::clearStrokeGradient()
{
    m_strokeData.clearGradient();
    ASSERT(!m_strokeData.pattern());
    m_strokePaint.setColor(applyAlpha(m_strokeData.color().rgb()));
}

void GraphicsContextState::setStrokePattern(const PassRefPtr<Pattern> pattern)
{
    m_strokeData.setColor(Color::black);
    m_strokeData.clearGradient();
    m_strokeData.setPattern(pattern);
    m_strokePaint.setColor(applyAlpha(SK_ColorBLACK));
    m_strokePaint.setShader(m_strokeData.pattern()->shader());
}

void GraphicsContextState::clearStrokePattern()
{
    m_strokeData.clearPattern();
    ASSERT(!m_strokeData.gradient());
    m_strokePaint.setColor(applyAlpha(m_strokeData.color().rgb()));
}

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.setShader(0);
}

void GraphicsContextState::setFillGradient(const PassRefPtr<Gradient> gradient)
{
    m_fillColor = Color::black;
    m_fillPattern.clear();
    m_fillGradient = gradient;
    m_fillPaint.setColor(applyAlpha(SK_ColorBLACK));
    m_fillPaint.setShader(m_fillGradient->shader());
}

void GraphicsContextState::clearFillGradient()
{
    m_fillGradient.clear();
    ASSERT(!m_fillPattern);
    m_fillPaint.setColor(applyAlpha(m_fillColor.rgb()));
}

void GraphicsContextState::setFillPattern(const PassRefPtr<Pattern> pattern)
{
    m_fillColor = Color::black;
    m_fillGradient.clear();
    m_fillPattern = pattern;
    m_fillPaint.setColor(applyAlpha(SK_ColorBLACK));
    m_fillPaint.setShader(m_fillPattern->shader());
}

void GraphicsContextState::clearFillPattern()
{
    m_fillPattern.clear();
    ASSERT(!m_fillGradient);
    m_fillPaint.setColor(applyAlpha(m_fillColor.rgb()));
}

// 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::setAlphaAsFloat(float alpha)
{
    if (alpha < 0) {
        m_alpha = 0;
    } else {
        m_alpha = roundf(alpha * 256);
        if (m_alpha > 256)
            m_alpha = 256;
    }
    m_strokePaint.setColor(applyAlpha(m_strokeData.color().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(CompositeOperator compositeOperation, blink::WebBlendMode blendMode)
{
    m_compositeOperator = compositeOperation;
    m_blendMode = blendMode;
    m_xferMode = WebCoreCompositeToSkiaComposite(compositeOperation, blendMode);
    m_strokePaint.setXfermode(m_xferMode.get());
    m_fillPaint.setXfermode(m_xferMode.get());
}

void GraphicsContextState::setInterpolationQuality(InterpolationQuality quality)
{
    m_interpolationQuality = quality;
    m_strokePaint.setFilterBitmap(quality != InterpolationNone);
    m_fillPaint.setFilterBitmap(quality != InterpolationNone);
}

void GraphicsContextState::setShouldAntialias(bool shouldAntialias)
{
    m_shouldAntialias = shouldAntialias;
    m_strokePaint.setAntiAlias(shouldAntialias);
    m_fillPaint.setAntiAlias(shouldAntialias);
}


} // namespace WebCore