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      1 /*
      2  * Copyright (c) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     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
    262