third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceClipper.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 LayoutSVGResourceClipper_h
  21 #define LayoutSVGResourceClipper_h
  22
  23 #include "core/layout/svg/LayoutSVGResourceContainer.h"
  24 #include "core/svg/SVGClipPathElement.h"
  25
  26 class SkPicture;
  27
  28 namespace blink {
  29
  30 class LayoutSVGResourceClipper final : public LayoutSVGResourceContainer {
  31 public:
  32     explicit LayoutSVGResourceClipper(SVGClipPathElement*);
  33     ~LayoutSVGResourceClipper() override;
  34
  35     const char* name() const override { return "LayoutSVGResourceClipper"; }
  36
  37     void removeAllClientsFromCache(bool markForInvalidation = true) override;
  38     void removeClientFromCache(LayoutObject*, bool markForInvalidation = true) override;
  39
  40     FloatRect resourceBoundingBox(const LayoutObject*);
  41
  42     static const LayoutSVGResourceType s_resourceType = ClipperResourceType;
  43     LayoutSVGResourceType resourceType() const override { return s_resourceType; }
  44
  45     bool hitTestClipContent(const FloatRect&, const FloatPoint&);
  46
  47     SVGUnitTypes::SVGUnitType clipPathUnits() const { return toSVGClipPathElement(element())->clipPathUnits()->currentValue()->enumValue(); }
  48
  49     bool asPath(const AffineTransform&, const FloatRect& referenceBox, Path&);
  50     PassRefPtr<const SkPicture> createContentPicture(AffineTransform&, const FloatRect&, GraphicsContext*);
  51
  52     bool hasCycle() { return m_inClipExpansion; }
  53     void beginClipExpansion() { ASSERT(!m_inClipExpansion); m_inClipExpansion = true; }
  54     void endClipExpansion() { ASSERT(m_inClipExpansion); m_inClipExpansion = false; }
  55 private:
  56     void calculateClipContentPaintInvalidationRect();
  57
  58     RefPtr<const SkPicture> m_clipContentPicture;
  59     FloatRect m_clipBoundaries;
  60
  61     // Reference cycle detection.
  62     bool m_inClipExpansion;
  63 };
  64
  65 DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(LayoutSVGResourceClipper, ClipperResourceType);
  66
  67 }
  68
  69 #endif