Font::CodePath Font::codePath(const TextRun& run) const
{
if (s_codePath != Auto)
return s_codePath;
#if ENABLE(SVG_FONTS)
if (run.renderingContext())
return Simple;
#endif
if (m_fontDescription.featureSettings() && m_fontDescription.featureSettings()->size() > 0)
return Complex;
if (run.length() > 1 && !WidthIterator::supportsTypesettingFeatures(*this))
return Complex;
if (!run.characterScanForCodePath())
return Simple;
if (run.is8Bit())
return Simple;
// Start from 0 since drawing and highlighting also measure the characters before run->from.
return characterRangeCodePath(run.characters16(), run.length());
}
void SVGInlineTextBox::restoreGraphicsContextAfterTextPainting(GraphicsContext*& context, TextRun& textRun)
{
releasePaintingResource(context, /* path */0);
#if ENABLE(SVG_FONTS)
TextRun::RenderingContext* renderingContext = textRun.renderingContext();
if (renderingContext)
static_cast<SVGTextRunRenderingContext*>(renderingContext)->setActivePaintingResource(0);
#endif
}
float Font::width(const TextRun& run, int& charsConsumed, String& glyphName) const
{
#if ENABLE(SVG_FONTS)
if (TextRun::RenderingContext* renderingContext = run.renderingContext())
return renderingContext->floatWidthUsingSVGFont(*this, run, charsConsumed, glyphName);
#endif
charsConsumed = run.length();
glyphName = "";
return width(run);
}
void Font::drawGlyphBuffer(GraphicsContext* context, const TextRun& run, const GlyphBuffer& glyphBuffer, FloatPoint& point) const
{
#if !ENABLE(SVG_FONTS)
UNUSED_PARAM(run);
#endif
// Draw each contiguous run of glyphs that use the same font data.
const SimpleFontData* fontData = glyphBuffer.fontDataAt(0);
FloatSize offset = glyphBuffer.offsetAt(0);
FloatPoint startPoint(point.x(), point.y() - glyphBuffer.initialAdvance().height());
float nextX = startPoint.x() + glyphBuffer.advanceAt(0).width();
float nextY = startPoint.y() + glyphBuffer.advanceAt(0).height();
int lastFrom = 0;
int nextGlyph = 1;
#if ENABLE(SVG_FONTS)
TextRun::RenderingContext* renderingContext = run.renderingContext();
#endif
while (nextGlyph < glyphBuffer.size()) {
const SimpleFontData* nextFontData = glyphBuffer.fontDataAt(nextGlyph);
FloatSize nextOffset = glyphBuffer.offsetAt(nextGlyph);
if (nextFontData != fontData || nextOffset != offset) {
#if ENABLE(SVG_FONTS)
if (renderingContext && fontData->isSVGFont())
renderingContext->drawSVGGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
else
#endif
drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
lastFrom = nextGlyph;
fontData = nextFontData;
offset = nextOffset;
startPoint.setX(nextX);
startPoint.setY(nextY);
}
nextX += glyphBuffer.advanceAt(nextGlyph).width();
nextY += glyphBuffer.advanceAt(nextGlyph).height();
nextGlyph++;
}
#if ENABLE(SVG_FONTS)
if (renderingContext && fontData->isSVGFont())
renderingContext->drawSVGGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
else {
#endif
drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
point.setX(nextX);
#if ENABLE(SVG_FONTS)
}
#endif
}
bool SVGInlineTextBox::prepareGraphicsContextForTextPainting(GraphicsContext*& context, float scalingFactor, TextRun& textRun, RenderStyle* style)
{
bool acquiredResource = acquirePaintingResource(context, scalingFactor, parent()->renderer(), style);
if (!acquiredResource)
return false;
#if ENABLE(SVG_FONTS)
// SVG Fonts need access to the painting resource used to draw the current text chunk.
TextRun::RenderingContext* renderingContext = textRun.renderingContext();
if (renderingContext)
static_cast<SVGTextRunRenderingContext*>(renderingContext)->setActivePaintingResource(m_paintingResource);
#endif
return true;
}
GlyphData SVGTextRunRenderingContext::glyphDataForCharacter(const Font& font, const TextRun& run, WidthIterator& iterator, UChar32 character, bool mirror, int currentCharacter, unsigned& advanceLength)
{
const SimpleFontData* primaryFont = font.primaryFont();
ASSERT(primaryFont);
pair<GlyphData, GlyphPage*> pair = font.glyphDataAndPageForCharacter(character, mirror);
GlyphData glyphData = pair.first;
// Check if we have the missing glyph data, in which case we can just return.
GlyphData missingGlyphData = primaryFont->missingGlyphData();
if (glyphData.glyph == missingGlyphData.glyph && glyphData.fontData == missingGlyphData.fontData) {
ASSERT(glyphData.fontData);
return glyphData;
}
// Characters enclosed by an <altGlyph> element, may not be registered in the GlyphPage.
const SimpleFontData* originalFontData = glyphData.fontData;
if (glyphData.fontData && !glyphData.fontData->isSVGFont()) {
if (TextRun::RenderingContext* renderingContext = run.renderingContext()) {
RenderObject* renderObject = static_cast<SVGTextRunRenderingContext*>(renderingContext)->renderer();
RenderObject* parentRenderObject = renderObject->isText() ? renderObject->parent() : renderObject;
ASSERT(parentRenderObject);
if (Element* parentRenderObjectElement = toElement(parentRenderObject->node())) {
if (parentRenderObjectElement->hasTagName(SVGNames::altGlyphTag))
glyphData.fontData = primaryFont;
}
}
}
const SimpleFontData* fontData = glyphData.fontData;
if (fontData) {
if (!fontData->isSVGFont())
return glyphData;
SVGFontElement* fontElement = 0;
SVGFontFaceElement* fontFaceElement = 0;
const SVGFontData* svgFontData = svgFontAndFontFaceElementForFontData(fontData, fontFaceElement, fontElement);
if (!fontElement || !fontFaceElement)
return glyphData;
// If we got here, we're dealing with a glyph defined in a SVG Font.
// The returned glyph by glyphDataAndPageForCharacter() is a glyph stored in the SVG Font glyph table.
// This doesn't necessarily mean the glyph is suitable for rendering/measuring in this context, its
// arabic-form/orientation/... may not match, we have to apply SVG Glyph selection to discover that.
if (svgFontData->applySVGGlyphSelection(iterator, glyphData, mirror, currentCharacter, advanceLength))
return glyphData;
}
GlyphPage* page = pair.second;
ASSERT(page);
FontFallbackList* fontList = font.fontList();
ASSERT(fontList);
// No suitable glyph found that is compatible with the requirments (same language, arabic-form, orientation etc.)
// Even though our GlyphPage contains an entry for eg. glyph "a", it's not compatible. So we have to temporarily
// remove the glyph data information from the GlyphPage, and retry the lookup, which handles font fallbacks correctly.
GlyphPageTreeNode* originalGlyphPageZero = fontList->glyphPageZero();
const FontFallbackList::GlyphPages& originalGlyphPages = fontList->glyphPages();
page->setGlyphDataForCharacter(character, glyphData.glyph, 0);
// Assure that the font fallback glyph selection worked, aka. the fallbackGlyphData font data is not the same as before.
GlyphData fallbackGlyphData = font.glyphDataForCharacter(character, mirror);
ASSERT(fallbackGlyphData.fontData != fontData);
// Restore original state of the SVG Font glyph table and the current font fallback list,
// to assure the next lookup of the same glyph won't immediately return the fallback glyph.
page->setGlyphDataForCharacter(character, glyphData.glyph, originalFontData);
fontList->setGlyphPageZero(originalGlyphPageZero);
fontList->setGlyphPages(originalGlyphPages);
ASSERT(fallbackGlyphData.fontData);
return fallbackGlyphData;
}
Font::CodePath Font::codePath(const TextRun& run) const
{
if (s_codePath != Auto)
return s_codePath;
#if ENABLE(SVG_FONTS)
if (run.renderingContext())
return Simple;
#endif
#if PLATFORM(QT) && !HAVE(QRAWFONT)
if (run.expansion() || run.rtl() || isSmallCaps() || wordSpacing() || letterSpacing())
return Complex;
#endif
if (m_fontDescription.featureSettings() && m_fontDescription.featureSettings()->size() > 0)
return Complex;
CodePath result = Simple;
// Start from 0 since drawing and highlighting also measure the characters before run->from
// FIXME: Should use a UnicodeSet in ports where ICU is used. Note that we
// can't simply use UnicodeCharacter Property/class because some characters
// are not 'combining', but still need to go to the complex path.
// Alternatively, we may as well consider binary search over a sorted
// list of ranges.
for (int i = 0; i < run.length(); i++) {
const UChar c = run[i];
if (c < 0x2E5) // U+02E5 through U+02E9 (Modifier Letters : Tone letters)
continue;
if (c <= 0x2E9)
return Complex;
if (c < 0x300) // U+0300 through U+036F Combining diacritical marks
continue;
if (c <= 0x36F)
return Complex;
if (c < 0x0591 || c == 0x05BE) // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha
continue;
if (c <= 0x05CF)
return Complex;
// U+0600 through U+109F Arabic, Syriac, Thaana, NKo, Samaritan, Mandaic,
// Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada,
// Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar
if (c < 0x0600)
continue;
if (c <= 0x109F)
return Complex;
// U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left here if you precompose;
// Modern Korean will be precomposed as a result of step A)
if (c < 0x1100)
continue;
if (c <= 0x11FF)
return Complex;
if (c < 0x135D) // U+135D through U+135F Ethiopic combining marks
continue;
if (c <= 0x135F)
return Complex;
if (c < 0x1700) // U+1780 through U+18AF Tagalog, Hanunoo, Buhid, Taghanwa,Khmer, Mongolian
continue;
if (c <= 0x18AF)
return Complex;
if (c < 0x1900) // U+1900 through U+194F Limbu (Unicode 4.0)
continue;
if (c <= 0x194F)
return Complex;
if (c < 0x1980) // U+1980 through U+19DF New Tai Lue
continue;
if (c <= 0x19DF)
return Complex;
if (c < 0x1A00) // U+1A00 through U+1CFF Buginese, Tai Tham, Balinese, Batak, Lepcha, Vedic
continue;
if (c <= 0x1CFF)
return Complex;
if (c < 0x1DC0) // U+1DC0 through U+1DFF Comining diacritical mark supplement
continue;
if (c <= 0x1DFF)
return Complex;
// U+1E00 through U+2000 characters with diacritics and stacked diacritics
if (c <= 0x2000) {
result = SimpleWithGlyphOverflow;
continue;
}
if (c < 0x20D0) // U+20D0 through U+20FF Combining marks for symbols
continue;
if (c <= 0x20FF)
return Complex;
if (c < 0x2CEF) // U+2CEF through U+2CF1 Combining marks for Coptic
continue;
if (c <= 0x2CF1)
return Complex;
if (c < 0x302A) // U+302A through U+302F Ideographic and Hangul Tone marks
continue;
if (c <= 0x302F)
return Complex;
if (c < 0xA67C) // U+A67C through U+A67D Combining marks for old Cyrillic
continue;
if (c <= 0xA67D)
return Complex;
if (c < 0xA6F0) // U+A6F0 through U+A6F1 Combining mark for Bamum
continue;
if (c <= 0xA6F1)
return Complex;
// U+A800 through U+ABFF Nagri, Phags-pa, Saurashtra, Devanagari Extended,
// Hangul Jamo Ext. A, Javanese, Myanmar Extended A, Tai Viet, Meetei Mayek,
if (c < 0xA800)
continue;
if (c <= 0xABFF)
return Complex;
if (c < 0xD7B0) // U+D7B0 through U+D7FF Hangul Jamo Ext. B
continue;
if (c <= 0xD7FF)
return Complex;
if (c <= 0xDBFF) {
// High surrogate
if (i == run.length() - 1)
continue;
UChar next = run[++i];
if (!U16_IS_TRAIL(next))
continue;
UChar32 supplementaryCharacter = U16_GET_SUPPLEMENTARY(c, next);
if (supplementaryCharacter < 0x1F1E6) // U+1F1E6 through U+1F1FF Regional Indicator Symbols
continue;
if (supplementaryCharacter <= 0x1F1FF)
return Complex;
if (supplementaryCharacter < 0xE0100) // U+E0100 through U+E01EF Unicode variation selectors.
continue;
if (supplementaryCharacter <= 0xE01EF)
return Complex;
// FIXME: Check for Brahmi (U+11000 block), Kaithi (U+11080 block) and other complex scripts
// in plane 1 or higher.
continue;
}
if (c < 0xFE00) // U+FE00 through U+FE0F Unicode variation selectors
continue;
if (c <= 0xFE0F)
return Complex;
if (c < 0xFE20) // U+FE20 through U+FE2F Combining half marks
continue;
if (c <= 0xFE2F)
return Complex;
}
if (run.length() > 1 && typesettingFeatures())
return Complex;
return result;
}