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      1 /*
      2  * Copyright (C) 2007 Rob Buis <buis (at) kde.org>
      3  *           (C) 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #ifndef SVGInlineTextBox_h
     23 #define SVGInlineTextBox_h
     24 
     25 #if ENABLE(SVG)
     26 #include "InlineTextBox.h"
     27 
     28 namespace WebCore {
     29 
     30     class SVGRootInlineBox;
     31 
     32     struct SVGChar;
     33     struct SVGTextDecorationInfo;
     34 
     35     enum SVGTextPaintSubphase {
     36         SVGTextPaintSubphaseBackground,
     37         SVGTextPaintSubphaseGlyphFill,
     38         SVGTextPaintSubphaseGlyphFillSelection,
     39         SVGTextPaintSubphaseGlyphStroke,
     40         SVGTextPaintSubphaseGlyphStrokeSelection,
     41         SVGTextPaintSubphaseForeground
     42     };
     43 
     44     struct SVGTextPaintInfo {
     45         SVGTextPaintInfo() : activePaintServer(0), subphase(SVGTextPaintSubphaseBackground) {}
     46 
     47         SVGPaintServer* activePaintServer;
     48         SVGTextPaintSubphase subphase;
     49     };
     50 
     51     class SVGInlineTextBox : public InlineTextBox {
     52     public:
     53         SVGInlineTextBox(RenderObject* obj);
     54 
     55         virtual int virtualHeight() const { return m_height; }
     56         void setHeight(int h) { m_height = h; }
     57 
     58         virtual int selectionTop();
     59         virtual int selectionHeight();
     60 
     61         virtual int offsetForPosition(int x, bool includePartialGlyphs = true) const;
     62         virtual int positionForOffset(int offset) const;
     63 
     64         virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty);
     65         virtual IntRect selectionRect(int absx, int absy, int startPos, int endPos);
     66 
     67         // SVGs custom paint text method
     68         void paintCharacters(RenderObject::PaintInfo&, int tx, int ty, const SVGChar&, const UChar* chars, int length, SVGTextPaintInfo&);
     69 
     70         // SVGs custom paint selection method
     71         void paintSelection(int boxStartOffset, const SVGChar&, const UChar*, int length, GraphicsContext*, RenderStyle*, const Font&);
     72 
     73         // SVGs custom paint decoration method
     74         void paintDecoration(ETextDecoration, GraphicsContext*, int tx, int ty, int width, const SVGChar&, const SVGTextDecorationInfo&);
     75 
     76         SVGRootInlineBox* svgRootInlineBox() const;
     77 
     78         // Helper functions shared with SVGRootInlineBox
     79         float calculateGlyphWidth(RenderStyle* style, int offset, int extraCharsAvailable, int& charsConsumed, String& glyphName) const;
     80         float calculateGlyphHeight(RenderStyle*, int offset, int extraCharsAvailable) const;
     81 
     82         FloatRect calculateGlyphBoundaries(RenderStyle*, int offset, const SVGChar&) const;
     83         SVGChar* closestCharacterToPosition(int x, int y, int& offset) const;
     84 
     85     private:
     86         friend class RenderSVGInlineText;
     87         bool svgCharacterHitsPosition(int x, int y, int& offset) const;
     88         bool chunkSelectionStartEnd(const UChar* chunk, int chunkLength, int& selectionStart, int& selectionEnd);
     89 
     90         int m_height;
     91     };
     92 
     93 } // namespace WebCore
     94 
     95 #endif
     96 #endif // SVGInlineTextBox_h
     97