FontCacheFreeType.cpp [plain text]
#include "config.h"
#include "FontCache.h"
#include "Font.h"
#include "RefPtrCairo.h"
#include "UTF16UChar32Iterator.h"
#include <cairo-ft.h>
#include <cairo.h>
#include <fontconfig/fcfreetype.h>
#include <wtf/Assertions.h>
#include <wtf/text/CString.h>
namespace WebCore {
void FontCache::platformInit()
{
if (!FcInit())
ASSERT_NOT_REACHED();
}
FcPattern* createFontConfigPatternForCharacters(const UChar* characters, int bufferLength)
{
FcPattern* pattern = FcPatternCreate();
FcCharSet* fontConfigCharSet = FcCharSetCreate();
UTF16UChar32Iterator iterator(characters, bufferLength);
UChar32 character = iterator.next();
while (character != iterator.end()) {
FcCharSetAddChar(fontConfigCharSet, character);
character = iterator.next();
}
FcPatternAddCharSet(pattern, FC_CHARSET, fontConfigCharSet);
FcCharSetDestroy(fontConfigCharSet);
FcPatternAddBool(pattern, FC_SCALABLE, FcTrue);
FcConfigSubstitute(0, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
return pattern;
}
FcPattern* findBestFontGivenFallbacks(const FontPlatformData& fontData, FcPattern* pattern)
{
if (!fontData.m_pattern)
return 0;
if (!fontData.m_fallbacks) {
FcResult fontConfigResult;
fontData.m_fallbacks = FcFontSort(0, fontData.m_pattern.get(), FcTrue, 0, &fontConfigResult);
}
if (!fontData.m_fallbacks)
return 0;
FcFontSet* sets[] = { fontData.m_fallbacks };
FcResult fontConfigResult;
return FcFontSetMatch(0, sets, 1, pattern, &fontConfigResult);
}
RefPtr<Font> FontCache::systemFallbackForCharacters(const FontDescription& description, const Font* originalFontData, bool, const UChar* characters, unsigned length)
{
RefPtr<FcPattern> pattern = adoptRef(createFontConfigPatternForCharacters(characters, length));
const FontPlatformData& fontData = originalFontData->platformData();
RefPtr<FcPattern> fallbackPattern = adoptRef(findBestFontGivenFallbacks(fontData, pattern.get()));
if (fallbackPattern) {
FontPlatformData alternateFontData(fallbackPattern.get(), description);
return fontForPlatformData(alternateFontData);
}
FcResult fontConfigResult;
RefPtr<FcPattern> resultPattern = adoptRef(FcFontMatch(0, pattern.get(), &fontConfigResult));
if (!resultPattern)
return 0;
FontPlatformData alternateFontData(resultPattern.get(), description);
return fontForPlatformData(alternateFontData);
}
Ref<Font> FontCache::lastResortFallbackFont(const FontDescription& fontDescription)
{
static AtomicString timesStr("serif");
return *fontForFamily(fontDescription, timesStr, false);
}
void FontCache::getTraitsInFamily(const AtomicString&, Vector<unsigned>&)
{
}
static String getFamilyNameStringFromFamily(const AtomicString& family)
{
if (family.length() && !family.startsWith("-webkit-"))
return family.string();
if (family == standardFamily || family == serifFamily)
return "serif";
if (family == sansSerifFamily)
return "sans-serif";
if (family == monospaceFamily)
return "monospace";
if (family == cursiveFamily)
return "cursive";
if (family == fantasyFamily)
return "fantasy";
return "";
}
int fontWeightToFontconfigWeight(FontWeight weight)
{
switch (weight) {
case FontWeight100:
return FC_WEIGHT_THIN;
case FontWeight200:
return FC_WEIGHT_ULTRALIGHT;
case FontWeight300:
return FC_WEIGHT_LIGHT;
case FontWeight400:
return FC_WEIGHT_REGULAR;
case FontWeight500:
return FC_WEIGHT_MEDIUM;
case FontWeight600:
return FC_WEIGHT_SEMIBOLD;
case FontWeight700:
return FC_WEIGHT_BOLD;
case FontWeight800:
return FC_WEIGHT_EXTRABOLD;
case FontWeight900:
return FC_WEIGHT_ULTRABLACK;
default:
ASSERT_NOT_REACHED();
return FC_WEIGHT_REGULAR;
}
}
std::unique_ptr<FontPlatformData> FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family)
{
RefPtr<FcPattern> pattern = adoptRef(FcPatternCreate());
FcPatternAddBool(pattern.get(), FC_SCALABLE, FcTrue);
String familyNameString(getFamilyNameStringFromFamily(family));
if (!FcPatternAddString(pattern.get(), FC_FAMILY, reinterpret_cast<const FcChar8*>(familyNameString.utf8().data())))
return nullptr;
bool italic = fontDescription.italic();
if (!FcPatternAddInteger(pattern.get(), FC_SLANT, italic ? FC_SLANT_ITALIC : FC_SLANT_ROMAN))
return nullptr;
if (!FcPatternAddInteger(pattern.get(), FC_WEIGHT, fontWeightToFontconfigWeight(fontDescription.weight())))
return nullptr;
if (!FcPatternAddDouble(pattern.get(), FC_PIXEL_SIZE, fontDescription.computedPixelSize()))
return nullptr;
FcConfigSubstitute(0, pattern.get(), FcMatchPattern);
FcDefaultSubstitute(pattern.get());
FcChar8* fontConfigFamilyNameAfterConfiguration;
FcPatternGetString(pattern.get(), FC_FAMILY, 0, &fontConfigFamilyNameAfterConfiguration);
String familyNameAfterConfiguration = String::fromUTF8(reinterpret_cast<char*>(fontConfigFamilyNameAfterConfiguration));
FcResult fontConfigResult;
RefPtr<FcPattern> resultPattern = adoptRef(FcFontMatch(0, pattern.get(), &fontConfigResult));
if (!resultPattern) return nullptr;
FcChar8* fontConfigFamilyNameAfterMatching;
FcPatternGetString(resultPattern.get(), FC_FAMILY, 0, &fontConfigFamilyNameAfterMatching);
String familyNameAfterMatching = String::fromUTF8(reinterpret_cast<char*>(fontConfigFamilyNameAfterMatching));
if (!equalIgnoringCase(familyNameAfterConfiguration, familyNameAfterMatching)
&& !(equalIgnoringCase(familyNameString, "sans") || equalIgnoringCase(familyNameString, "sans-serif")
|| equalIgnoringCase(familyNameString, "serif") || equalIgnoringCase(familyNameString, "monospace")
|| equalIgnoringCase(familyNameString, "fantasy") || equalIgnoringCase(familyNameString, "cursive")))
return nullptr;
auto platformData = std::make_unique<FontPlatformData>(resultPattern.get(), fontDescription);
if (!platformData->hasCompatibleCharmap())
return nullptr;
return platformData;
}
}