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Diffstat (limited to 'Source/WebCore/svg/SVGFontData.cpp')
| -rw-r--r-- | Source/WebCore/svg/SVGFontData.cpp | 308 |
1 files changed, 0 insertions, 308 deletions
diff --git a/Source/WebCore/svg/SVGFontData.cpp b/Source/WebCore/svg/SVGFontData.cpp deleted file mode 100644 index 25793a5ef..000000000 --- a/Source/WebCore/svg/SVGFontData.cpp +++ /dev/null @@ -1,308 +0,0 @@ -/* - * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org> - * - * 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" - -#if ENABLE(SVG_FONTS) -#include "SVGFontData.h" - -#include "RenderElement.h" -#include "SVGAltGlyphElement.h" -#include "SVGFontElement.h" -#include "SVGFontFaceElement.h" -#include "SVGGlyph.h" -#include "SVGGlyphElement.h" -#include "SVGNames.h" -#include "SVGTextRunRenderingContext.h" -#include "TextRun.h" -#include "WidthIterator.h" -#include "XMLNames.h" -#include <wtf/text/StringBuilder.h> -#include <wtf/unicode/CharacterNames.h> -#include <wtf/unicode/Unicode.h> - -using namespace WTF; -using namespace Unicode; - -namespace WebCore { - -SVGFontData::SVGFontData(SVGFontFaceElement* fontFaceElement) - : m_svgFontFaceElement(fontFaceElement) - , m_horizontalOriginX(fontFaceElement->horizontalOriginX()) - , m_horizontalOriginY(fontFaceElement->horizontalOriginY()) - , m_horizontalAdvanceX(fontFaceElement->horizontalAdvanceX()) - , m_verticalOriginX(fontFaceElement->verticalOriginX()) - , m_verticalOriginY(fontFaceElement->verticalOriginY()) - , m_verticalAdvanceY(fontFaceElement->verticalAdvanceY()) -{ - ASSERT_ARG(fontFaceElement, fontFaceElement); -} - -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->setSpaceWidth(0); - fontData->setAvgCharWidth(0); - fontData->setMaxCharWidth(ascent); - return; - } - - // Calculate space width. - Glyph spaceGlyph = glyphPageZero->glyphDataForCharacter(' ').glyph; - fontData->setSpaceGlyph(spaceGlyph); - fontData->setSpaceWidth(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); -} - -float SVGFontData::widthForSVGGlyph(Glyph glyph, float fontSize) const -{ - SVGFontFaceElement* svgFontFaceElement = this->svgFontFaceElement(); - ASSERT(svgFontFaceElement); - - SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement(); - ASSERT(associatedFontElement); - - SVGGlyph svgGlyph = associatedFontElement->svgGlyphForGlyph(glyph); - SVGGlyphElement::inheritUnspecifiedAttributes(svgGlyph, this); - return svgGlyph.horizontalAdvanceX * scaleEmToUnits(fontSize, svgFontFaceElement->unitsPerEm()); -} - -bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& glyphData, bool mirror, int currentCharacter, unsigned& advanceLength) const -{ - const TextRun& run = iterator.run(); - Vector<SVGGlyph::ArabicForm>& arabicForms = iterator.arabicForms(); - ASSERT(int(run.charactersLength()) >= currentCharacter); - - // Associate text with arabic forms, if needed. - String remainingTextInRun; - - if (run.is8Bit()) { - remainingTextInRun = String(run.data8(currentCharacter), run.charactersLength() - currentCharacter); - remainingTextInRun = Font::normalizeSpaces(remainingTextInRun.characters8(), remainingTextInRun.length()); - } else { - remainingTextInRun = String(run.data16(currentCharacter), run.charactersLength() - currentCharacter); - remainingTextInRun = Font::normalizeSpaces(remainingTextInRun.characters16(), remainingTextInRun.length()); - } - - if (mirror) - remainingTextInRun = createStringWithMirroredCharacters(remainingTextInRun.deprecatedCharacters(), remainingTextInRun.length()); - if (!currentCharacter && arabicForms.isEmpty()) - arabicForms = charactersWithArabicForm(remainingTextInRun, mirror); - - SVGFontFaceElement* svgFontFaceElement = this->svgFontFaceElement(); - ASSERT(svgFontFaceElement); - - SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement(); - ASSERT(associatedFontElement); - - RenderObject* renderObject = 0; - if (TextRun::RenderingContext* renderingContext = run.renderingContext()) - renderObject = &static_cast<SVGTextRunRenderingContext*>(renderingContext)->renderer(); - - String language; - bool isVerticalText = false; - Vector<String> altGlyphNames; - - if (renderObject) { - RenderElement* parentRenderer = renderObject->isRenderElement() ? toRenderElement(renderObject) : renderObject->parent(); - ASSERT(parentRenderer); - - isVerticalText = parentRenderer->style().svgStyle().isVerticalWritingMode(); - if (Element* parentRendererElement = parentRenderer->element()) { - language = parentRendererElement->getAttribute(XMLNames::langAttr); - - if (isSVGAltGlyphElement(parentRendererElement)) { - SVGAltGlyphElement* altGlyph = toSVGAltGlyphElement(parentRendererElement); - if (!altGlyph->hasValidGlyphElements(altGlyphNames)) - altGlyphNames.clear(); - } - } - } - - Vector<SVGGlyph> glyphs; - size_t altGlyphNamesSize = altGlyphNames.size(); - if (altGlyphNamesSize) { - for (size_t index = 0; index < altGlyphNamesSize; ++index) - associatedFontElement->collectGlyphsForGlyphName(altGlyphNames[index], glyphs); - - // Assign the unicodeStringLength now that its known. - size_t glyphsSize = glyphs.size(); - for (size_t i = 0; i < glyphsSize; ++i) - glyphs[i].unicodeStringLength = run.length(); - - // Do not check alt glyphs for compatibility. Just return the first one. - // Later code will fail if we do not do this and the glyph is incompatible. - if (glyphsSize) { - SVGGlyph& svgGlyph = glyphs[0]; - iterator.setLastGlyphName(svgGlyph.glyphName); - glyphData.glyph = svgGlyph.tableEntry; - advanceLength = svgGlyph.unicodeStringLength; - return true; - } - } else - associatedFontElement->collectGlyphsForString(remainingTextInRun, glyphs); - - size_t glyphsSize = glyphs.size(); - for (size_t i = 0; i < glyphsSize; ++i) { - SVGGlyph& svgGlyph = glyphs[i]; - if (svgGlyph.isPartOfLigature) - continue; - if (!isCompatibleGlyph(svgGlyph, isVerticalText, language, arabicForms, currentCharacter, currentCharacter + svgGlyph.unicodeStringLength)) - continue; - iterator.setLastGlyphName(svgGlyph.glyphName); - glyphData.glyph = svgGlyph.tableEntry; - advanceLength = svgGlyph.unicodeStringLength; - return true; - } - - iterator.setLastGlyphName(String()); - return false; -} - -bool SVGFontData::fillSVGGlyphPage(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData) const -{ - ASSERT(fontData->isCustomFont()); - ASSERT(fontData->isSVGFont()); - - SVGFontFaceElement* fontFaceElement = this->svgFontFaceElement(); - ASSERT(fontFaceElement); - - SVGFontElement* fontElement = fontFaceElement->associatedFontElement(); - ASSERT(fontElement); - - if (bufferLength == length) - return fillBMPGlyphs(fontElement, pageToFill, offset, length, buffer, fontData); - - ASSERT(bufferLength == 2 * length); - return fillNonBMPGlyphs(fontElement, pageToFill, offset, length, buffer, fontData); -} - -bool SVGFontData::fillBMPGlyphs(SVGFontElement* fontElement, GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, const SimpleFontData* fontData) const -{ - bool haveGlyphs = false; - Vector<SVGGlyph> glyphs; - for (unsigned i = 0; i < length; ++i) { - String lookupString(buffer + i, 1); - fontElement->collectGlyphsForString(lookupString, glyphs); - if (glyphs.isEmpty()) { - pageToFill->setGlyphDataForIndex(offset + i, 0, 0); - continue; - } - - // Associate entry in glyph page with first valid SVGGlyph. - // If there are multiple valid ones, just take the first one. WidthIterator will take - // care of matching to the correct glyph, if multiple ones are available, as that's - // only possible within the context of a string (eg. arabic form matching). - haveGlyphs = true; - pageToFill->setGlyphDataForIndex(offset + i, glyphs.first().tableEntry, fontData); - glyphs.clear(); - } - - return haveGlyphs; -} - -bool SVGFontData::fillNonBMPGlyphs(SVGFontElement* fontElement, GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, const SimpleFontData* fontData) const -{ - bool haveGlyphs = false; - Vector<SVGGlyph> glyphs; - for (unsigned i = 0; i < length; ++i) { - // Each character here consists of a surrogate pair - String lookupString(buffer + i * 2, 2); - fontElement->collectGlyphsForString(lookupString, glyphs); - if (glyphs.isEmpty()) { - pageToFill->setGlyphDataForIndex(offset + i, 0, 0); - continue; - } - - // Associate entry in glyph page with first valid SVGGlyph. - // If there are multiple valid ones, just take the first one. WidthIterator will take - // care of matching to the correct glyph, if multiple ones are available, as that's - // only possible within the context of a string (eg. arabic form matching). - haveGlyphs = true; - pageToFill->setGlyphDataForIndex(offset + i, glyphs.first().tableEntry, fontData); - glyphs.clear(); - } - - return haveGlyphs; -} - -String SVGFontData::createStringWithMirroredCharacters(const UChar* characters, unsigned length) const -{ - StringBuilder mirroredCharacters; - mirroredCharacters.reserveCapacity(length); - - unsigned i = 0; - while (i < length) { - UChar32 character; - U16_NEXT(characters, i, length, character); - mirroredCharacters.append(u_charMirror(character)); - } - - return mirroredCharacters.toString(); -} - -} // namespace WebCore - -#endif |