third_party/WebKit/Source/core/layout/svg/LayoutSVGResourcePaintServer.h

   1 /*
   2  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifndef LayoutSVGResourcePaintServer_h
  21 #define LayoutSVGResourcePaintServer_h
  22
  23 #include "core/layout/svg/LayoutSVGResourceContainer.h"
  24 #include "platform/graphics/Color.h"
  25 #include "platform/graphics/Gradient.h"
  26 #include "platform/graphics/Pattern.h"
  27 #include "wtf/Allocator.h"
  28
  29 class SkPaint;
  30
  31 namespace blink {
  32
  33 enum LayoutSVGResourceMode {
  34     ApplyToFillMode,
  35     ApplyToStrokeMode,
  36 };
  37
  38 class LayoutObject;
  39 class LayoutSVGResourcePaintServer;
  40 class ComputedStyle;
  41
  42 class SVGPaintServer {
  43     STACK_ALLOCATED();
  44 public:
  45     explicit SVGPaintServer(Color);
  46     explicit SVGPaintServer(PassRefPtr<Gradient>);
  47     explicit SVGPaintServer(PassRefPtr<Pattern>);
  48
  49     static SVGPaintServer requestForLayoutObject(const LayoutObject&, const ComputedStyle&, LayoutSVGResourceMode);
  50     static bool existsForLayoutObject(const LayoutObject&, const ComputedStyle&, LayoutSVGResourceMode);
  51
  52     void applyToSkPaint(SkPaint&, float paintAlpha);
  53
  54     static SVGPaintServer invalid() { return SVGPaintServer(Color(Color::transparent)); }
  55     bool isValid() const { return m_color != Color::transparent; }
  56
  57     bool isTransformDependent() const { return m_gradient || m_pattern; }
  58     void prependTransform(const AffineTransform&);
  59
  60 private:
  61     RefPtr<Gradient> m_gradient;
  62     RefPtr<Pattern> m_pattern;
  63     Color m_color;
  64 };
  65
  66 // If |SVGPaintDescription::hasFallback| is true, |SVGPaintDescription::color| is set to a fallback color.
  67 struct SVGPaintDescription {
  68     STACK_ALLOCATED();
  69     SVGPaintDescription() : resource(nullptr), isValid(false), hasFallback(false) { }
  70     SVGPaintDescription(Color color) : resource(nullptr), color(color), isValid(true), hasFallback(false) { }
  71     SVGPaintDescription(LayoutSVGResourcePaintServer* resource) : resource(resource), isValid(true), hasFallback(false) { ASSERT(resource); }
  72     SVGPaintDescription(LayoutSVGResourcePaintServer* resource, Color fallbackColor) : resource(resource), color(fallbackColor), isValid(true), hasFallback(true) { ASSERT(resource); }
  73
  74     LayoutSVGResourcePaintServer* resource;
  75     Color color;
  76     bool isValid;
  77     bool hasFallback;
  78 };
  79
  80 class LayoutSVGResourcePaintServer : public LayoutSVGResourceContainer {
  81 public:
  82     LayoutSVGResourcePaintServer(SVGElement*);
  83     ~LayoutSVGResourcePaintServer() override;
  84
  85     virtual SVGPaintServer preparePaintServer(const LayoutObject&) = 0;
  86
  87     // Helper utilities used in to access the underlying resources for DRT.
  88     static SVGPaintDescription requestPaintDescription(const LayoutObject&, const ComputedStyle&, LayoutSVGResourceMode);
  89 };
  90
  91 DEFINE_TYPE_CASTS(LayoutSVGResourcePaintServer, LayoutSVGResourceContainer, resource, resource->isSVGPaintServer(), resource.isSVGPaintServer());
  92
  93 }
  94
  95 #endif