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// 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef GraphicsContextState_h
#define GraphicsContextState_h
#include "platform/graphics/Gradient.h"
#include "platform/graphics/GraphicsTypes.h"
#include "platform/graphics/Path.h"
#include "platform/graphics/Pattern.h"
#include "platform/graphics/StrokeData.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "third_party/skia/include/core/SkDrawLooper.h"
#include "third_party/skia/include/effects/SkDashPathEffect.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefPtr.h"
namespace WebCore {
// Encapsulates the state information we store for each pushed graphics state.
// Only GraphicsContext can use this class.
class GraphicsContextState {
private:
friend class GraphicsContext;
GraphicsContextState()
: m_fillColor(Color::black)
, m_fillRule(RULE_NONZERO)
, m_textDrawingMode(TextModeFill)
, m_alpha(1)
, m_xferMode(0)
, m_compositeOperator(CompositeSourceOver)
, m_blendMode(blink::WebBlendModeNormal)
#if USE(LOW_QUALITY_IMAGE_INTERPOLATION)
, m_interpolationQuality(InterpolationLow)
#else
, m_interpolationQuality(InterpolationHigh)
#endif
, m_shouldAntialias(true)
, m_shouldSmoothFonts(true)
, m_shouldClampToSourceRect(true)
{
}
GraphicsContextState(const GraphicsContextState& other)
: m_strokeData(other.m_strokeData)
, m_fillColor(other.m_fillColor)
, m_fillRule(other.m_fillRule)
, m_fillGradient(other.m_fillGradient)
, m_fillPattern(other.m_fillPattern)
, m_looper(other.m_looper)
, m_textDrawingMode(other.m_textDrawingMode)
, m_alpha(other.m_alpha)
, m_xferMode(other.m_xferMode)
, m_colorFilter(other.m_colorFilter)
, m_compositeOperator(other.m_compositeOperator)
, m_blendMode(other.m_blendMode)
, m_interpolationQuality(other.m_interpolationQuality)
, m_shouldAntialias(other.m_shouldAntialias)
, m_shouldSmoothFonts(other.m_shouldSmoothFonts)
, m_shouldClampToSourceRect(other.m_shouldClampToSourceRect)
{
}
// Helper function for applying the state's alpha value to the given input
// color to produce a new output color.
SkColor applyAlpha(SkColor c) const
{
int s = roundf(m_alpha * 256);
if (s >= 256)
return c;
if (s < 0)
return 0;
int a = SkAlphaMul(SkColorGetA(c), s);
return (c & 0x00FFFFFF) | (a << 24);
}
// Returns a new State with all of this object's inherited properties copied.
PassOwnPtr<GraphicsContextState> clone() { return adoptPtr(new GraphicsContextState(*this)); }
// Not supported. No implementations.
void operator=(const GraphicsContextState&);
// Stroke.
StrokeData m_strokeData;
// Fill.
Color m_fillColor;
WindRule m_fillRule;
RefPtr<Gradient> m_fillGradient;
RefPtr<Pattern> m_fillPattern;
// Shadow. (This will need tweaking if we use draw loopers for other things.)
RefPtr<SkDrawLooper> m_looper;
// Text. (See TextModeFill & friends.)
TextDrawingModeFlags m_textDrawingMode;
// Common shader state.
float m_alpha;
RefPtr<SkXfermode> m_xferMode;
RefPtr<SkColorFilter> m_colorFilter;
// Compositing control, for the CSS and Canvas compositing spec.
CompositeOperator m_compositeOperator;
blink::WebBlendMode m_blendMode;
// Image interpolation control.
InterpolationQuality m_interpolationQuality;
bool m_shouldAntialias : 1;
bool m_shouldSmoothFonts : 1;
bool m_shouldClampToSourceRect : 1;
};
} // namespace WebCore
#endif // GraphicsContextState_h
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