| /* |
| * Copyright (C) Research In Motion Limited 2010. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| |
| #include "core/rendering/svg/SVGTextLayoutEngineSpacing.h" |
| |
| #include "core/rendering/style/SVGRenderStyle.h" |
| #include "core/svg/SVGLengthContext.h" |
| #include "platform/fonts/Character.h" |
| #include "platform/fonts/Font.h" |
| |
| #if ENABLE(SVG_FONTS) |
| #include "core/svg/SVGFontData.h" |
| #include "core/svg/SVGFontElement.h" |
| #include "core/svg/SVGFontFaceElement.h" |
| #endif |
| |
| namespace WebCore { |
| |
| SVGTextLayoutEngineSpacing::SVGTextLayoutEngineSpacing(const Font& font) |
| : m_font(font) |
| , m_lastCharacter(0) |
| #if ENABLE(SVG_FONTS) |
| , m_lastGlyph(0) |
| #endif |
| { |
| } |
| |
| float SVGTextLayoutEngineSpacing::calculateSVGKerning(bool isVerticalText, Glyph currentGlyph) |
| { |
| #if ENABLE(SVG_FONTS) |
| const SimpleFontData* fontData = m_font.primaryFont(); |
| if (!fontData->isSVGFont()) { |
| m_lastGlyph = 0; |
| return 0; |
| } |
| |
| ASSERT(fontData->isCustomFont()); |
| ASSERT(fontData->isSVGFont()); |
| |
| RefPtr<CustomFontData> customFontData = fontData->customFontData(); |
| const SVGFontData* svgFontData = static_cast<const SVGFontData*>(customFontData.get()); |
| SVGFontFaceElement* svgFontFace = svgFontData->svgFontFaceElement(); |
| ASSERT(svgFontFace); |
| |
| SVGFontElement* svgFont = svgFontFace->associatedFontElement(); |
| if (!svgFont) { |
| m_lastGlyph = 0; |
| return 0; |
| } |
| |
| float kerning = 0; |
| if (m_lastGlyph) { |
| if (isVerticalText) |
| kerning = svgFont->verticalKerningForPairOfGlyphs(m_lastGlyph, currentGlyph); |
| else |
| kerning = svgFont->horizontalKerningForPairOfGlyphs(m_lastGlyph, currentGlyph); |
| |
| kerning *= m_font.fontDescription().computedSize() / m_font.fontMetrics().unitsPerEm(); |
| } |
| |
| m_lastGlyph = currentGlyph; |
| return kerning; |
| #else |
| return 0; |
| #endif |
| } |
| |
| float SVGTextLayoutEngineSpacing::calculateCSSKerningAndSpacing(const SVGRenderStyle* style, SVGElement* contextElement, UChar currentCharacter) |
| { |
| float kerning = 0; |
| RefPtr<SVGLength> kerningLength = style->kerning(); |
| if (kerningLength->unitType() == LengthTypePercentage) |
| kerning = kerningLength->valueAsPercentage() * m_font.fontDescription().computedPixelSize(); |
| else { |
| SVGLengthContext lengthContext(contextElement); |
| kerning = kerningLength->value(lengthContext); |
| } |
| |
| UChar lastCharacter = m_lastCharacter; |
| m_lastCharacter = currentCharacter; |
| |
| if (!kerning && !m_font.fontDescription().letterSpacing() && !m_font.fontDescription().wordSpacing()) |
| return 0; |
| |
| float spacing = m_font.fontDescription().letterSpacing() + kerning; |
| if (currentCharacter && lastCharacter && m_font.fontDescription().wordSpacing()) { |
| if (Character::treatAsSpace(currentCharacter) && !Character::treatAsSpace(lastCharacter)) |
| spacing += m_font.fontDescription().wordSpacing(); |
| } |
| |
| return spacing; |
| } |
| |
| } |