Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/GraphicsContextState.h

-// 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 "core/platform/graphics/Gradient.h"
-#include "core/platform/graphics/Path.h"
-#include "core/platform/graphics/Pattern.h"
-#include "core/platform/graphics/StrokeData.h"
-#include "platform/graphics/GraphicsTypes.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
-