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      1 /*
      2  * Copyright (C) 2007 Rob Buis <buis (at) kde.org>
      3  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #ifndef SVGInlineTextBox_h
     23 #define SVGInlineTextBox_h
     24 
     25 #include "core/rendering/InlineTextBox.h"
     26 #include "core/rendering/svg/SVGTextLayoutEngine.h"
     27 
     28 namespace WebCore {
     29 
     30 class RenderSVGResource;
     31 class SVGRootInlineBox;
     32 
     33 class SVGInlineTextBox FINAL : public InlineTextBox {
     34 public:
     35     SVGInlineTextBox(RenderObject*);
     36 
     37     virtual bool isSVGInlineTextBox() const { return true; }
     38 
     39     virtual float virtualLogicalHeight() const { return m_logicalHeight; }
     40     void setLogicalHeight(float height) { m_logicalHeight = height; }
     41 
     42     virtual int selectionTop() { return top(); }
     43     virtual int selectionHeight() { return static_cast<int>(ceilf(m_logicalHeight)); }
     44     virtual int offsetForPosition(float x, bool includePartialGlyphs = true) const;
     45     virtual float positionForOffset(int offset) const;
     46 
     47     void paintSelectionBackground(PaintInfo&);
     48     virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom);
     49     virtual LayoutRect localSelectionRect(int startPosition, int endPosition);
     50 
     51     bool mapStartEndPositionsIntoFragmentCoordinates(const SVGTextFragment&, int& startPosition, int& endPosition) const;
     52 
     53     virtual FloatRect calculateBoundaries() const;
     54 
     55     void clearTextFragments() { m_textFragments.clear(); }
     56     Vector<SVGTextFragment>& textFragments() { return m_textFragments; }
     57     const Vector<SVGTextFragment>& textFragments() const { return m_textFragments; }
     58 
     59     virtual void dirtyLineBoxes() OVERRIDE FINAL;
     60 
     61     bool startsNewTextChunk() const { return m_startsNewTextChunk; }
     62     void setStartsNewTextChunk(bool newTextChunk) { m_startsNewTextChunk = newTextChunk; }
     63 
     64     int offsetForPositionInFragment(const SVGTextFragment&, float position, bool includePartialGlyphs) const;
     65     FloatRect selectionRectForTextFragment(const SVGTextFragment&, int fragmentStartPosition, int fragmentEndPosition, RenderStyle*);
     66 
     67 private:
     68     TextRun constructTextRun(RenderStyle*, const SVGTextFragment&) const;
     69 
     70     bool acquirePaintingResource(GraphicsContext*&, float scalingFactor, RenderObject*, RenderStyle*);
     71     void releasePaintingResource(GraphicsContext*&, const Path*);
     72 
     73     bool prepareGraphicsContextForTextPainting(GraphicsContext*&, float scalingFactor, TextRun&, RenderStyle*);
     74     void restoreGraphicsContextAfterTextPainting(GraphicsContext*&, TextRun&);
     75 
     76     void paintDecoration(GraphicsContext*, TextDecoration, const SVGTextFragment&);
     77     void paintDecorationWithStyle(GraphicsContext*, TextDecoration, const SVGTextFragment&, RenderObject* decorationRenderer);
     78     void paintTextWithShadows(GraphicsContext*, RenderStyle*, TextRun&, const SVGTextFragment&, int startPosition, int endPosition);
     79     void paintText(GraphicsContext*, RenderStyle*, RenderStyle* selectionStyle, const SVGTextFragment&, bool hasSelection, bool paintSelectedTextOnly);
     80 
     81     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
     82 
     83 private:
     84     float m_logicalHeight;
     85     unsigned m_paintingResourceMode : 4;
     86     unsigned m_startsNewTextChunk : 1;
     87     RenderSVGResource* m_paintingResource;
     88     Vector<SVGTextFragment> m_textFragments;
     89 };
     90 
     91 inline SVGInlineTextBox* toSVGInlineTextBox(InlineBox* box)
     92 {
     93     ASSERT_WITH_SECURITY_IMPLICATION(!box || box->isSVGInlineTextBox());
     94     return static_cast<SVGInlineTextBox*>(box);
     95 }
     96 
     97 } // namespace WebCore
     98 
     99 #endif // SVGInlineTextBox_h
    100