1/* 2 * Copyright (C) Research In Motion Limited 2010. 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#include "config.h" 21 22#include "core/rendering/svg/SVGTextLayoutEngineSpacing.h" 23 24#include "core/svg/SVGLengthContext.h" 25#include "platform/fonts/Character.h" 26#include "platform/fonts/Font.h" 27 28#if ENABLE(SVG_FONTS) 29#include "core/svg/SVGFontData.h" 30#include "core/svg/SVGFontElement.h" 31#include "core/svg/SVGFontFaceElement.h" 32#endif 33 34namespace blink { 35 36SVGTextLayoutEngineSpacing::SVGTextLayoutEngineSpacing(const Font& font, float effectiveZoom) 37 : m_font(font) 38 , m_lastCharacter(0) 39 , m_effectiveZoom(effectiveZoom) 40#if ENABLE(SVG_FONTS) 41 , m_lastGlyph(0) 42#endif 43{ 44 ASSERT(m_effectiveZoom); 45} 46 47float SVGTextLayoutEngineSpacing::calculateSVGKerning(bool isVerticalText, Glyph currentGlyph) 48{ 49#if ENABLE(SVG_FONTS) 50 const SimpleFontData* fontData = m_font.primaryFont(); 51 if (!fontData->isSVGFont()) { 52 m_lastGlyph = 0; 53 return 0; 54 } 55 56 ASSERT(fontData->isCustomFont()); 57 ASSERT(fontData->isSVGFont()); 58 59 RefPtr<CustomFontData> customFontData = fontData->customFontData(); 60 SVGFontFaceElement* svgFontFace = toSVGFontData(customFontData)->svgFontFaceElement(); 61 ASSERT(svgFontFace); 62 63 SVGFontElement* svgFont = svgFontFace->associatedFontElement(); 64 if (!svgFont) { 65 m_lastGlyph = 0; 66 return 0; 67 } 68 69 float kerning = 0; 70 if (m_lastGlyph) { 71 if (isVerticalText) 72 kerning = svgFont->verticalKerningForPairOfGlyphs(m_lastGlyph, currentGlyph); 73 else 74 kerning = svgFont->horizontalKerningForPairOfGlyphs(m_lastGlyph, currentGlyph); 75 76 kerning *= m_font.fontDescription().computedSize() / m_font.fontMetrics().unitsPerEm(); 77 } 78 79 m_lastGlyph = currentGlyph; 80 return kerning; 81#else 82 return 0; 83#endif 84} 85 86float SVGTextLayoutEngineSpacing::calculateCSSSpacing(UChar currentCharacter) 87{ 88 UChar lastCharacter = m_lastCharacter; 89 m_lastCharacter = currentCharacter; 90 91 if (!m_font.fontDescription().letterSpacing() && !m_font.fontDescription().wordSpacing()) 92 return 0; 93 94 float spacing = m_font.fontDescription().letterSpacing(); 95 if (currentCharacter && lastCharacter && m_font.fontDescription().wordSpacing()) { 96 if (Character::treatAsSpace(currentCharacter) && !Character::treatAsSpace(lastCharacter)) 97 spacing += m_font.fontDescription().wordSpacing(); 98 } 99 100 if (m_effectiveZoom != 1) 101 spacing = spacing / m_effectiveZoom; 102 103 return spacing; 104} 105 106} 107