SimpleFontData::SimpleFontData(PassOwnPtr<SVGFontData> svgFontData, int size, bool syntheticBold, bool syntheticItalic) : m_platformData(FontPlatformData(size, syntheticBold, syntheticItalic)) , m_treatAsFixedPitch(false) , m_svgFontData(svgFontData) , m_isCustomFont(true) , m_isLoading(false) , m_isTextOrientationFallback(false) , m_isBrokenIdeographFallback(false) , m_hasVerticalGlyphs(false) { SVGFontFaceElement* svgFontFaceElement = m_svgFontData->svgFontFaceElement(); unsigned unitsPerEm = svgFontFaceElement->unitsPerEm(); float scale = size; if (unitsPerEm) scale /= unitsPerEm; float xHeight = svgFontFaceElement->xHeight() * scale; float ascent = svgFontFaceElement->ascent() * scale; float descent = svgFontFaceElement->descent() * scale; float lineGap = 0.1f * size; SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement(); if (!xHeight) { // Fallback if x_heightAttr is not specified for the font element. Vector<SVGGlyphIdentifier> letterXGlyphs; associatedFontElement->getGlyphIdentifiersForString(String("x", 1), letterXGlyphs); xHeight = letterXGlyphs.isEmpty() ? 2 * ascent / 3 : letterXGlyphs.first().horizontalAdvanceX * scale; } m_fontMetrics.setUnitsPerEm(unitsPerEm); m_fontMetrics.setAscent(ascent); m_fontMetrics.setDescent(descent); m_fontMetrics.setLineGap(lineGap); m_fontMetrics.setLineSpacing(roundf(ascent) + roundf(descent) + roundf(lineGap)); m_fontMetrics.setXHeight(xHeight); Vector<SVGGlyphIdentifier> spaceGlyphs; associatedFontElement->getGlyphIdentifiersForString(String(" ", 1), spaceGlyphs); m_spaceWidth = spaceGlyphs.isEmpty() ? xHeight : spaceGlyphs.first().horizontalAdvanceX * scale; Vector<SVGGlyphIdentifier> numeralZeroGlyphs; associatedFontElement->getGlyphIdentifiersForString(String("0", 1), numeralZeroGlyphs); m_avgCharWidth = numeralZeroGlyphs.isEmpty() ? m_spaceWidth : numeralZeroGlyphs.first().horizontalAdvanceX * scale; Vector<SVGGlyphIdentifier> letterWGlyphs; associatedFontElement->getGlyphIdentifiersForString(String("W", 1), letterWGlyphs); m_maxCharWidth = letterWGlyphs.isEmpty() ? ascent : letterWGlyphs.first().horizontalAdvanceX * scale; // FIXME: is there a way we can get the space glyph from the SVGGlyphIdentifier above? m_spaceGlyph = 0; m_zeroWidthSpaceGlyph = 0; determinePitch(); m_missingGlyphData.fontData = this; m_missingGlyphData.glyph = 0; }
SimpleFontData::SimpleFontData(PassOwnPtr<SVGFontData> svgFontData, int size, bool syntheticBold, bool syntheticItalic) : m_orientation(Horizontal) , m_platformData(FontPlatformData(size, syntheticBold, syntheticItalic)) , m_treatAsFixedPitch(false) , m_svgFontData(svgFontData) , m_isCustomFont(true) , m_isLoading(false) , m_isBrokenIdeographFont(false) { SVGFontFaceElement* svgFontFaceElement = m_svgFontData->svgFontFaceElement(); m_unitsPerEm = svgFontFaceElement->unitsPerEm(); double scale = size; if (m_unitsPerEm) scale /= m_unitsPerEm; m_ascent = static_cast<int>(svgFontFaceElement->ascent() * scale); m_descent = static_cast<int>(svgFontFaceElement->descent() * scale); m_xHeight = static_cast<int>(svgFontFaceElement->xHeight() * scale); m_lineGap = 0.1f * size; m_lineSpacing = m_ascent + m_descent + m_lineGap; SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement(); Vector<SVGGlyphIdentifier> spaceGlyphs; associatedFontElement->getGlyphIdentifiersForString(String(" ", 1), spaceGlyphs); m_spaceWidth = spaceGlyphs.isEmpty() ? m_xHeight : static_cast<float>(spaceGlyphs.first().horizontalAdvanceX * scale); Vector<SVGGlyphIdentifier> numeralZeroGlyphs; associatedFontElement->getGlyphIdentifiersForString(String("0", 1), numeralZeroGlyphs); m_avgCharWidth = numeralZeroGlyphs.isEmpty() ? m_spaceWidth : static_cast<float>(numeralZeroGlyphs.first().horizontalAdvanceX * scale); Vector<SVGGlyphIdentifier> letterWGlyphs; associatedFontElement->getGlyphIdentifiersForString(String("W", 1), letterWGlyphs); m_maxCharWidth = letterWGlyphs.isEmpty() ? m_ascent : static_cast<float>(letterWGlyphs.first().horizontalAdvanceX * scale); // FIXME: is there a way we can get the space glyph from the SVGGlyphIdentifier above? m_spaceGlyph = 0; m_zeroWidthSpaceGlyph = 0; determinePitch(); m_adjustedSpaceWidth = roundf(m_spaceWidth); m_missingGlyphData.fontData = this; m_missingGlyphData.glyph = 0; }
void SVGFontData::initializeFontData(SimpleFontData* fontData, float fontSize) { ASSERT(fontData); SVGFontFaceElement* svgFontFaceElement = this->svgFontFaceElement(); ASSERT(svgFontFaceElement); SVGFontElement* svgFontElement = svgFontFaceElement->associatedFontElement(); ASSERT(svgFontElement); GlyphData missingGlyphData; missingGlyphData.fontData = fontData; missingGlyphData.glyph = svgFontElement->missingGlyph(); fontData->setMissingGlyphData(missingGlyphData); fontData->setZeroWidthSpaceGlyph(0); fontData->determinePitch(); unsigned unitsPerEm = svgFontFaceElement->unitsPerEm(); float scale = scaleEmToUnits(fontSize, unitsPerEm); float xHeight = svgFontFaceElement->xHeight() * scale; float ascent = svgFontFaceElement->ascent() * scale; float descent = svgFontFaceElement->descent() * scale; float lineGap = 0.1f * fontSize; GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(fontData, 0)->page(); if (!xHeight && glyphPageZero) { // Fallback if x_heightAttr is not specified for the font element. Glyph letterXGlyph = glyphPageZero->glyphDataForCharacter('x').glyph; xHeight = letterXGlyph ? fontData->widthForGlyph(letterXGlyph) : 2 * ascent / 3; } FontMetrics& fontMetrics = fontData->fontMetrics(); fontMetrics.setUnitsPerEm(unitsPerEm); fontMetrics.setAscent(ascent); fontMetrics.setDescent(descent); fontMetrics.setLineGap(lineGap); fontMetrics.setLineSpacing(roundf(ascent) + roundf(descent) + roundf(lineGap)); fontMetrics.setXHeight(xHeight); if (!glyphPageZero) { fontData->setSpaceGlyph(0); fontData->setSpaceWidths(0); fontData->setAvgCharWidth(0); fontData->setMaxCharWidth(ascent); return; } // Calculate space width. Glyph spaceGlyph = glyphPageZero->glyphDataForCharacter(' ').glyph; fontData->setSpaceGlyph(spaceGlyph); fontData->setSpaceWidths(fontData->widthForGlyph(spaceGlyph)); // Estimate average character width. Glyph numeralZeroGlyph = glyphPageZero->glyphDataForCharacter('0').glyph; fontData->setAvgCharWidth(numeralZeroGlyph ? fontData->widthForGlyph(numeralZeroGlyph) : fontData->spaceWidth()); // Estimate maximum character width. Glyph letterWGlyph = glyphPageZero->glyphDataForCharacter('W').glyph; fontData->setMaxCharWidth(letterWGlyph ? fontData->widthForGlyph(letterWGlyph) : ascent); }