const FontData* FontCache::getFontData(const Font& font, int& familyIndex)
{
FontPlatformData* result = 0;
int startIndex = familyIndex;
const FontFamily* startFamily = &font.fontDescription().family();
for (int i = 0; startFamily && i < startIndex; i++)
startFamily = startFamily->next();
const FontFamily* currFamily = startFamily;
while (currFamily && !result) {
familyIndex++;
if (currFamily->family().length())
result = getCachedFontPlatformData(font.fontDescription(), currFamily->family());
currFamily = currFamily->next();
}
if (!currFamily)
familyIndex = cAllFamiliesScanned;
if (!result)
// We didn't find a font. Try to find a similar font using our own specific knowledge about our platform.
// For example on OS X, we know to map any families containing the words Arabic, Pashto, or Urdu to the
// Geeza Pro font.
result = getSimilarFontPlatformData(font);
if (!result && startIndex == 0)
// We still don't have a result. Hand back our last resort fallback font. We only do the last resort fallback
// when trying to find the primary font. Otherwise our fallback will rely on the actual characters used.
result = getLastResortFallbackFont(font);
// Now that we have a result, we need to go from FontPlatformData -> FontData.
return getCachedFontData(result);
}
PassRefPtr<SimpleFontData> FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
{
RefPtr<SimpleFontData> fontData = 0;
fontData = getCachedFontData(font.fontDescription(), font.family().family(), false, DoNotRetain);
if (!fontData->containsCharacters(characters, length))
fontData = getSimilarFontPlatformData(font);
if (!fontData->containsCharacters(characters, length))
fontData = getLastResortFallbackFont(font.fontDescription());
ASSERT(fontData);
return fontData.release();
}
const SimpleFontData* FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
{
SimpleFontData* fontData = 0;
fontData = getCachedFontData(font.fontDescription(), font.family().family());
if (!fontData->containsCharacters(characters, length))
fontData = getSimilarFontPlatformData(font);
if (!fontData->containsCharacters(characters, length))
fontData = getLastResortFallbackFont(font.fontDescription());
ASSERT(fontData);
return fontData;
}
const FontData* FontCache::getFontData(const Font& font, int& familyIndex, FontSelector* fontSelector)
{
FontPlatformData* result = 0;
int startIndex = familyIndex;
const FontFamily* startFamily = &font.fontDescription().family();
for (int i = 0; startFamily && i < startIndex; i++)
startFamily = startFamily->next();
const FontFamily* currFamily = startFamily;
while (currFamily && !result) {
familyIndex++;
if (currFamily->family().length()) {
if (fontSelector) {
FontData* data = fontSelector->getFontData(font.fontDescription(), currFamily->family());
if (data)
return data;
}
result = getCachedFontPlatformData(font.fontDescription(), currFamily->family());
}
currFamily = currFamily->next();
}
if (!currFamily)
familyIndex = cAllFamiliesScanned;
if (!result) {
// We didn't find a font. Try to find a similar font using our own specific knowledge about our platform.
// For example on OS X, we know to map any families containing the words Arabic, Pashto, or Urdu to the
// Geeza Pro font.
//+ 4/27/09 CSidhall - The old code created a new fontPlatfromData here but left the pointer to leak.
// We will use the exising font cache to store it in so that we can collect it.
// There might be some risk if fontPlatformData gets added from another location with the same
// key value. This would overwrite the mapped value, causing a leak. Have not seen this to occur in
// however while testing several sites.
// Original code:
// result = getSimilarFontPlatformData(font);
// New code:
// Verify that we don't have one already in the cache (the familyIndex might have skipped this step)
const FontDescription& fontDescription = font.fontDescription();
// Use first font family as default name for the key
const AtomicString& familyName = font.fontDescription().family().family();
result = getCachedFontPlatformData(fontDescription, familyName);
if(!result) {
// No default font was found so should be safe to add to key location
result = getSimilarFontPlatformData(font);
FontPlatformDataCacheKey key(familyName, fontDescription.computedPixelSize(), fontDescription.weight(), fontDescription.italic(),
fontDescription.usePrinterFont(), fontDescription.renderingMode());
gFontPlatformDataCache->set(key,result);
}
//- CS
}
if (!result && startIndex == 0) {
// If it's the primary font that we couldn't find, we try the following. In all other cases, we will
// just use per-character system fallback.
if (fontSelector) {
// Try the user's preferred standard font.
if (FontData* data = fontSelector->getFontData(font.fontDescription(), "-webkit-standard"))
return data;
}
// Still no result. Hand back our last resort fallback font.
result = getLastResortFallbackFont(font.fontDescription());
}
// Now that we have a result, we need to go from FontPlatformData -> FontData.
return getCachedFontData(result);
}
