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      1 /*
      2  * Copyright (C) 2006 Oliver Hunt <ojh16 (at) student.canterbury.ac.nz>
      3  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
      4  * Copyright (C) 2008 Rob Buis <buis (at) kde.org>
      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 RenderSVGInlineText_h
     23 #define RenderSVGInlineText_h
     24 
     25 #include "core/rendering/RenderText.h"
     26 #include "core/rendering/svg/SVGTextLayoutAttributes.h"
     27 
     28 namespace WebCore {
     29 
     30 class SVGInlineTextBox;
     31 
     32 class RenderSVGInlineText FINAL : public RenderText {
     33 public:
     34     RenderSVGInlineText(Node*, PassRefPtr<StringImpl>);
     35 
     36     bool characterStartsNewTextChunk(int position) const;
     37     SVGTextLayoutAttributes* layoutAttributes() { return &m_layoutAttributes; }
     38 
     39     float scalingFactor() const { return m_scalingFactor; }
     40     const Font& scaledFont() const { return m_scaledFont; }
     41     void updateScaledFont();
     42     static void computeNewScaledFontForStyle(RenderObject*, const RenderStyle*, float& scalingFactor, Font& scaledFont);
     43 
     44     // Preserves floating point precision for the use in DRT. It knows how to round and does a better job than enclosingIntRect.
     45     FloatRect floatLinesBoundingBox() const;
     46 
     47 private:
     48     virtual const char* renderName() const { return "RenderSVGInlineText"; }
     49 
     50     virtual void setTextInternal(PassRefPtr<StringImpl>);
     51     virtual void styleDidChange(StyleDifference, const RenderStyle*);
     52 
     53     virtual FloatRect objectBoundingBox() const { return floatLinesBoundingBox(); }
     54 
     55     virtual bool requiresLayer() const { return false; }
     56     virtual bool isSVGInlineText() const { return true; }
     57 
     58     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE FINAL;
     59     virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0);
     60     virtual IntRect linesBoundingBox() const;
     61     virtual InlineTextBox* createTextBox();
     62 
     63     float m_scalingFactor;
     64     Font m_scaledFont;
     65     SVGTextLayoutAttributes m_layoutAttributes;
     66 };
     67 
     68 inline RenderSVGInlineText* toRenderSVGInlineText(RenderObject* object)
     69 {
     70     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGInlineText());
     71     return static_cast<RenderSVGInlineText*>(object);
     72 }
     73 
     74 inline const RenderSVGInlineText* toRenderSVGInlineText(const RenderObject* object)
     75 {
     76     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGInlineText());
     77     return static_cast<const RenderSVGInlineText*>(object);
     78 }
     79 
     80 // This will catch anyone doing an unnecessary cast.
     81 void toRenderSVGInlineText(const RenderSVGInlineText*);
     82 
     83 }
     84 
     85 #endif // RenderSVGInlineText_h
     86