src/third_party/WebKit/Source/platform/fonts/skia/FontCacheSkia.cpp

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  11  * copyright notice, this list of conditions and the following disclaimer
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  13  * distribution.
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  30
  31 #include "config.h"
  32
  33 #if !OS(WIN) && !OS(ANDROID)
  34 #include "SkFontConfigInterface.h"
  35 #endif
  36 #include "SkFontMgr.h"
  37 #include "SkStream.h"
  38 #include "SkTypeface.h"
  39 #include "platform/NotImplemented.h"
  40 #include "platform/fonts/AlternateFontFamily.h"
  41 #include "platform/fonts/FontCache.h"
  42 #include "platform/fonts/FontDescription.h"
  43 #include "platform/fonts/FontFaceCreationParams.h"
  44 #include "platform/fonts/SimpleFontData.h"
  45 #include "public/platform/Platform.h"
  46 #include "public/platform/linux/WebSandboxSupport.h"
  47 #include "wtf/Assertions.h"
  48 #include "wtf/text/AtomicString.h"
  49 #include "wtf/text/CString.h"
  50 #include <unicode/locid.h>
  51
  52 #if !OS(WIN) && !OS(ANDROID)
  53 static SkStream* streamForFontconfigInterfaceId(int fontconfigInterfaceId)
  54 {
  55     SkAutoTUnref<SkFontConfigInterface> fci(SkFontConfigInterface::RefGlobal());
  56     SkFontConfigInterface::FontIdentity fontIdentity;
  57     fontIdentity.fID = fontconfigInterfaceId;
  58     return fci->openStream(fontIdentity);
  59 }
  60 #endif
  61
  62 namespace blink {
  63
  64 void FontCache::platformInit()
  65 {
  66 }
  67
  68 PassRefPtr<SimpleFontData> FontCache::fallbackOnStandardFontStyle(
  69     const FontDescription& fontDescription, UChar32 character)
  70 {
  71     FontDescription substituteDescription(fontDescription);
  72     substituteDescription.setStyle(FontStyleNormal);
  73     substituteDescription.setWeight(FontWeightNormal);
  74
  75     FontFaceCreationParams creationParams(substituteDescription.family().family());
  76     FontPlatformData* substitutePlatformData = getFontPlatformData(substituteDescription, creationParams);
  77     if (substitutePlatformData && substitutePlatformData->fontContainsCharacter(character)) {
  78         FontPlatformData platformData = FontPlatformData(*substitutePlatformData);
  79         platformData.setSyntheticBold(fontDescription.weight() >= FontWeight600);
  80         platformData.setSyntheticItalic(fontDescription.style() == FontStyleItalic);
  81         return fontDataFromFontPlatformData(&platformData, DoNotRetain);
  82     }
  83
  84     return nullptr;
  85 }
  86
  87 #if !OS(WIN) && !OS(ANDROID)
  88 PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*)
  89 {
  90     // First try the specified font with standard style & weight.
  91     if (fontDescription.style() == FontStyleItalic
  92         || fontDescription.weight() >= FontWeight600) {
  93         RefPtr<SimpleFontData> fontData = fallbackOnStandardFontStyle(
  94             fontDescription, c);
  95         if (fontData)
  96             return fontData;
  97     }
  98
  99     FontCache::PlatformFallbackFont fallbackFont;
 100     FontCache::getFontForCharacter(c, fontDescription.locale().ascii().data(), &fallbackFont);
 101     if (fallbackFont.name.isEmpty())
 102         return nullptr;
 103
 104     FontFaceCreationParams creationParams;
 105     creationParams = FontFaceCreationParams(fallbackFont.filename, fallbackFont.fontconfigInterfaceId, fallbackFont.ttcIndex);
 106
 107     // Changes weight and/or italic of given FontDescription depends on
 108     // the result of fontconfig so that keeping the correct font mapping
 109     // of the given character. See http://crbug.com/32109 for details.
 110     bool shouldSetSyntheticBold = false;
 111     bool shouldSetSyntheticItalic = false;
 112     FontDescription description(fontDescription);
 113     if (fallbackFont.isBold && description.weight() < FontWeightBold)
 114         description.setWeight(FontWeightBold);
 115     if (!fallbackFont.isBold && description.weight() >= FontWeightBold) {
 116         shouldSetSyntheticBold = true;
 117         description.setWeight(FontWeightNormal);
 118     }
 119     if (fallbackFont.isItalic && description.style() == FontStyleNormal)
 120         description.setStyle(FontStyleItalic);
 121     if (!fallbackFont.isItalic && description.style() == FontStyleItalic) {
 122         shouldSetSyntheticItalic = true;
 123         description.setStyle(FontStyleNormal);
 124     }
 125
 126     FontPlatformData* substitutePlatformData = getFontPlatformData(description, creationParams);
 127     if (!substitutePlatformData)
 128         return nullptr;
 129     FontPlatformData platformData = FontPlatformData(*substitutePlatformData);
 130     platformData.setSyntheticBold(shouldSetSyntheticBold);
 131     platformData.setSyntheticItalic(shouldSetSyntheticItalic);
 132     return fontDataFromFontPlatformData(&platformData, DoNotRetain);
 133 }
 134
 135 #endif // !OS(WIN) && !OS(ANDROID)
 136
 137 PassRefPtr<SimpleFontData> FontCache::getLastResortFallbackFont(const FontDescription& description, ShouldRetain shouldRetain)
 138 {
 139     const FontFaceCreationParams fallbackCreationParams(getFallbackFontFamily(description));
 140     const FontPlatformData* fontPlatformData = getFontPlatformData(description, fallbackCreationParams);
 141
 142     // We should at least have Sans or Arial which is the last resort fallback of SkFontHost ports.
 143     if (!fontPlatformData) {
 144         DEFINE_STATIC_LOCAL(const FontFaceCreationParams, sansCreationParams, (AtomicString("Sans", AtomicString::ConstructFromLiteral)));
 145         fontPlatformData = getFontPlatformData(description, sansCreationParams);
 146     }
 147     if (!fontPlatformData) {
 148         DEFINE_STATIC_LOCAL(const FontFaceCreationParams, arialCreationParams, (AtomicString("Arial", AtomicString::ConstructFromLiteral)));
 149         fontPlatformData = getFontPlatformData(description, arialCreationParams);
 150     }
 151 #if OS(WIN)
 152     // Try some more Windows-specific fallbacks.
 153     if (!fontPlatformData) {
 154         DEFINE_STATIC_LOCAL(const FontFaceCreationParams, msuigothicCreationParams, (AtomicString("MS UI Gothic", AtomicString::ConstructFromLiteral)));
 155         fontPlatformData = getFontPlatformData(description, msuigothicCreationParams);
 156     }
 157     if (!fontPlatformData) {
 158         DEFINE_STATIC_LOCAL(const FontFaceCreationParams, mssansserifCreationParams, (AtomicString("Microsoft Sans Serif", AtomicString::ConstructFromLiteral)));
 159         fontPlatformData = getFontPlatformData(description, mssansserifCreationParams);
 160     }
 161 #endif
 162
 163     ASSERT(fontPlatformData);
 164     return fontDataFromFontPlatformData(fontPlatformData, shouldRetain);
 165 }
 166
 167 #if OS(WIN)
 168 static inline SkFontStyle fontStyle(const FontDescription& fontDescription)
 169 {
 170     int width = static_cast<int>(fontDescription.stretch());
 171     int weight = (fontDescription.weight() - FontWeight100 + 1) * 100;
 172     SkFontStyle::Slant slant = fontDescription.style() == FontStyleItalic
 173         ? SkFontStyle::kItalic_Slant
 174         : SkFontStyle::kUpright_Slant;
 175     return SkFontStyle(weight, width, slant);
 176 }
 177
 178 COMPILE_ASSERT(static_cast<int>(FontStretchUltraCondensed) == static_cast<int>(SkFontStyle::kUltraCondensed_Width),
 179     FontStretchUltraCondensedMapsTokUltraCondensed_Width);
 180 COMPILE_ASSERT(static_cast<int>(FontStretchNormal) == static_cast<int>(SkFontStyle::kNormal_Width),
 181     FontStretchNormalMapsTokNormal_Width);
 182 COMPILE_ASSERT(static_cast<int>(FontStretchUltraExpanded) == static_cast<int>(SkFontStyle::kUltaExpanded_Width),
 183     FontStretchUltraExpandedMapsTokUltaExpanded_Width);
 184 #endif
 185
 186 PassRefPtr<SkTypeface> FontCache::createTypeface(const FontDescription& fontDescription, const FontFaceCreationParams& creationParams, CString& name)
 187 {
 188 #if !OS(WIN) && !OS(ANDROID)
 189     if (creationParams.creationType() == CreateFontByFciIdAndTtcIndex) {
 190         // TODO(dro): crbug.com/381620 Use creationParams.ttcIndex() after
 191         // https://code.google.com/p/skia/issues/detail?id=1186 gets fixed.
 192         SkTypeface* typeface = nullptr;
 193         if (Platform::current()->sandboxSupport())
 194             typeface = SkTypeface::CreateFromStream(streamForFontconfigInterfaceId(creationParams.fontconfigInterfaceId()));
 195         else
 196             typeface = SkTypeface::CreateFromFile(creationParams.filename().data());
 197
 198         if (typeface)
 199             return adoptRef(typeface);
 200         else
 201             return nullptr;
 202     }
 203 #endif
 204
 205     AtomicString family = creationParams.family();
 206     // If we're creating a fallback font (e.g. "-webkit-monospace"), convert the name into
 207     // the fallback name (like "monospace") that fontconfig understands.
 208     if (!family.length() || family.startsWith("-webkit-")) {
 209         name = getFallbackFontFamily(fontDescription).string().utf8();
 210     } else {
 211         // convert the name to utf8
 212         name = family.utf8();
 213     }
 214
 215     int style = SkTypeface::kNormal;
 216     if (fontDescription.weight() >= FontWeight600)
 217         style |= SkTypeface::kBold;
 218     if (fontDescription.style())
 219         style |= SkTypeface::kItalic;
 220
 221 #if OS(WIN)
 222     if (s_sideloadedFonts) {
 223         HashMap<String, RefPtr<SkTypeface> >::iterator sideloadedFont =
 224             s_sideloadedFonts->find(name.data());
 225         if (sideloadedFont != s_sideloadedFonts->end())
 226             return sideloadedFont->value;
 227     }
 228
 229     if (m_fontManager) {
 230         return adoptRef(useDirectWrite()
 231             ? m_fontManager->matchFamilyStyle(name.data(), fontStyle(fontDescription))
 232             : m_fontManager->legacyCreateTypeface(name.data(), style)
 233             );
 234     }
 235 #endif
 236
 237     // FIXME: Use m_fontManager, SkFontStyle and matchFamilyStyle instead of
 238     // CreateFromName on all platforms.
 239     return adoptRef(SkTypeface::CreateFromName(name.data(), static_cast<SkTypeface::Style>(style)));
 240 }
 241
 242 #if !OS(WIN)
 243 FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const FontFaceCreationParams& creationParams, float fontSize)
 244 {
 245     CString name;
 246     RefPtr<SkTypeface> tf(createTypeface(fontDescription, creationParams, name));
 247     if (!tf)
 248         return 0;
 249
 250     FontPlatformData* result = new FontPlatformData(tf,
 251         name.data(),
 252         fontSize,
 253         (fontDescription.weight() >= FontWeight600 && !tf->isBold()) || fontDescription.isSyntheticBold(),
 254         (fontDescription.style() && !tf->isItalic()) || fontDescription.isSyntheticItalic(),
 255         fontDescription.orientation(),
 256         fontDescription.useSubpixelPositioning());
 257     return result;
 258 }
 259 #endif // !OS(WIN)
 260
 261 } // namespace blink