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      1 /*
      2  * Copyright (C) Research In Motion Limited 2011. 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 
     21 #ifndef SVGTextRunRenderingContext_h
     22 #define SVGTextRunRenderingContext_h
     23 
     24 #include "platform/fonts/Font.h"
     25 #include "platform/text/TextRun.h"
     26 
     27 namespace WebCore {
     28 
     29 class RenderObject;
     30 class RenderSVGResource;
     31 
     32 class SVGTextRunRenderingContext : public TextRun::RenderingContext {
     33 public:
     34     static PassRefPtr<SVGTextRunRenderingContext> create(RenderObject* renderer)
     35     {
     36         return adoptRef(new SVGTextRunRenderingContext(renderer));
     37     }
     38 
     39     RenderObject* renderer() const { return m_renderer; }
     40 
     41 #if ENABLE(SVG_FONTS)
     42     RenderSVGResource* activePaintingResource() const { return m_activePaintingResource; }
     43     void setActivePaintingResource(RenderSVGResource* object) { m_activePaintingResource = object; }
     44 
     45     virtual GlyphData glyphDataForCharacter(const Font&, const TextRun&, WidthIterator&, UChar32 character, bool mirror, int currentCharacter, unsigned& advanceLength);
     46     virtual void drawSVGGlyphs(GraphicsContext*, const TextRun&, const SimpleFontData*, const GlyphBuffer&, int from, int to, const FloatPoint&) const;
     47     virtual float floatWidthUsingSVGFont(const Font&, const TextRun&, int& charsConsumed, String& glyphName) const;
     48 #endif
     49 
     50 private:
     51     SVGTextRunRenderingContext(RenderObject* renderer)
     52         : m_renderer(renderer)
     53 #if ENABLE(SVG_FONTS)
     54         , m_activePaintingResource(0)
     55 #endif
     56     {
     57     }
     58 
     59     virtual ~SVGTextRunRenderingContext() { }
     60 
     61     RenderObject* m_renderer;
     62 
     63 #if ENABLE(SVG_FONTS)
     64     RenderSVGResource* m_activePaintingResource;
     65 #endif
     66 };
     67 
     68 inline bool textRunNeedsRenderingContext(const Font& font)
     69 {
     70     // Only save the extra data if SVG Fonts are used, which depend on them.
     71     // FIXME: SVG Fonts won't work as segmented fonts at the moment, if that's fixed, we need to check for them as well below.
     72     ASSERT(font.primaryFont());
     73     return font.primaryFont()->isSVGFont();
     74 }
     75 
     76 } // namespace WebCore
     77 
     78 #endif // SVGTextRunRenderingContext_h
     79