1/*
2 * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
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 SVGFontData_h
21#define SVGFontData_h
22
23#if ENABLE(SVG_FONTS)
24#include "platform/fonts/CustomFontData.h"
25#include "wtf/WeakPtr.h"
26#include "wtf/text/WTFString.h"
27
28namespace blink {
29
30class SimpleFontData;
31class SVGFontElement;
32class SVGFontFaceElement;
33
34class SVGFontData FINAL : public CustomFontData {
35public:
36    static PassRefPtr<SVGFontData> create(SVGFontFaceElement* element)
37    {
38        return adoptRef(new SVGFontData(element));
39    }
40
41    virtual ~SVGFontData();
42
43    virtual bool isSVGFont() const OVERRIDE { return true; };
44    virtual bool shouldSkipDrawing() const OVERRIDE;
45    virtual void initializeFontData(SimpleFontData*, float fontSize) OVERRIDE;
46    virtual float widthForSVGGlyph(Glyph, float fontSize) const OVERRIDE;
47    virtual bool fillSVGGlyphPage(GlyphPage*, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData*) const OVERRIDE;
48    virtual bool applySVGGlyphSelection(WidthIterator&, GlyphData&, bool mirror, int currentCharacter, unsigned& advanceLength) const OVERRIDE;
49
50    SVGFontFaceElement* svgFontFaceElement() const;
51
52    float horizontalOriginX() const { return m_horizontalOriginX; }
53    float horizontalOriginY() const { return m_horizontalOriginY; }
54    float horizontalAdvanceX() const { return m_horizontalAdvanceX; }
55
56    float verticalOriginX() const { return m_verticalOriginX; }
57    float verticalOriginY() const { return m_verticalOriginY; }
58    float verticalAdvanceY() const { return m_verticalAdvanceY; }
59
60private:
61    SVGFontData(SVGFontFaceElement*);
62
63    bool fillBMPGlyphs(SVGFontElement*, GlyphPage* , unsigned offset, unsigned length, UChar* buffer, const SimpleFontData*) const;
64    bool fillNonBMPGlyphs(SVGFontElement*, GlyphPage* , unsigned offset, unsigned length, UChar* buffer, const SimpleFontData*) const;
65
66    String createStringWithMirroredCharacters(const String&) const;
67
68    // Ths SVGFontFaceElement is kept alive --
69    // 1) in the external font case: by the CSSFontFaceSource, which holds a reference to the external SVG document
70    //    containing the element;
71    // 2) in the in-document font case: by virtue of being in the document tree and making sure that when it is removed
72    //    from the document, it removes the @font-face rule it owns from the document's mapped element sheet and forces
73    //    a style update.
74    WeakPtr<SVGFontFaceElement> m_svgFontFaceElement;
75
76    float m_horizontalOriginX;
77    float m_horizontalOriginY;
78    float m_horizontalAdvanceX;
79
80    float m_verticalOriginX;
81    float m_verticalOriginY;
82    float m_verticalAdvanceY;
83};
84
85DEFINE_CUSTOM_FONT_DATA_TYPE_CASTS(SVGFontData, isSVGFont());
86
87} // namespace blink
88
89#endif
90#endif // SVGFontData_h
91