src/third_party/WebKit/Source/platform/fonts/linux/FontPlatformDataLinuxHarfBuzz.cpp

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  30
  31 #include "config.h"
  32 #include "public/platform/Platform.h"
  33
  34 #include "SkTypeface.h"
  35 #include "platform/LayoutTestSupport.h"
  36 #include "platform/RuntimeEnabledFeatures.h"
  37 #include "platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.h"
  38 #include "public/platform/linux/WebFontInfo.h"
  39 #include "public/platform/linux/WebFontRenderStyle.h"
  40 #include "public/platform/linux/WebSandboxSupport.h"
  41
  42 namespace WebCore {
  43
  44 static SkPaint::Hinting skiaHinting = SkPaint::kNormal_Hinting;
  45 static bool useSkiaAutoHint = true;
  46 static bool useSkiaBitmaps = true;
  47 static bool useSkiaAntiAlias = true;
  48 static bool useSkiaSubpixelRendering = false;
  49
  50 void FontPlatformData::setHinting(SkPaint::Hinting hinting)
  51 {
  52     skiaHinting = hinting;
  53 }
  54
  55 void FontPlatformData::setAutoHint(bool useAutoHint)
  56 {
  57     useSkiaAutoHint = useAutoHint;
  58 }
  59
  60 void FontPlatformData::setUseBitmaps(bool useBitmaps)
  61 {
  62     useSkiaBitmaps = useBitmaps;
  63 }
  64
  65 void FontPlatformData::setAntiAlias(bool useAntiAlias)
  66 {
  67     useSkiaAntiAlias = useAntiAlias;
  68 }
  69
  70 void FontPlatformData::setSubpixelRendering(bool useSubpixelRendering)
  71 {
  72     useSkiaSubpixelRendering = useSubpixelRendering;
  73 }
  74
  75 void FontPlatformData::setupPaint(SkPaint* paint, GraphicsContext*) const
  76 {
  77     paint->setAntiAlias(m_style.useAntiAlias);
  78     paint->setHinting(static_cast<SkPaint::Hinting>(m_style.hintStyle));
  79     paint->setEmbeddedBitmapText(m_style.useBitmaps);
  80     paint->setAutohinted(m_style.useAutoHint);
  81     if (m_style.useAntiAlias)
  82         paint->setLCDRenderText(m_style.useSubpixelRendering);
  83
  84     // TestRunner specifically toggles the subpixel positioning flag.
  85     if (RuntimeEnabledFeatures::subpixelFontScalingEnabled()
  86         && paint->getHinting() != SkPaint::kFull_Hinting
  87         && !isRunningLayoutTest())
  88         paint->setSubpixelText(true);
  89     else
  90         paint->setSubpixelText(m_style.useSubpixelPositioning);
  91
  92     const float ts = m_textSize >= 0 ? m_textSize : 12;
  93     paint->setTextSize(SkFloatToScalar(ts));
  94     paint->setTypeface(m_typeface.get());
  95     paint->setFakeBoldText(m_syntheticBold);
  96     paint->setTextSkewX(m_syntheticItalic ? -SK_Scalar1 / 4 : 0);
  97 }
  98
  99
 100 static inline void getRenderStyleForStrike(FontRenderStyle& fontRenderStyle, const char* font, int sizeAndStyle)
 101 {
 102     blink::WebFontRenderStyle style;
 103
 104 #if OS(ANDROID)
 105     style.setDefaults();
 106 #else
 107     if (!font || !*font)
 108         style.setDefaults(); // It's probably a webfont. Take the system defaults.
 109     else if (blink::Platform::current()->sandboxSupport())
 110         blink::Platform::current()->sandboxSupport()->getRenderStyleForStrike(font, sizeAndStyle, &style);
 111     else
 112         blink::WebFontInfo::renderStyleForStrike(font, sizeAndStyle, &style);
 113 #endif
 114
 115     style.toFontRenderStyle(&fontRenderStyle);
 116 }
 117
 118 void FontPlatformData::querySystemForRenderStyle(bool useSkiaSubpixelPositioning)
 119 {
 120     getRenderStyleForStrike(m_style, m_family.data(), (((int)m_textSize) << 2) | (m_typeface->style() & 3));
 121
 122     // Fix FontRenderStyle::NoPreference to actual styles.
 123     if (m_style.useAntiAlias == FontRenderStyle::NoPreference)
 124         m_style.useAntiAlias = useSkiaAntiAlias;
 125
 126     if (!m_style.useHinting)
 127         m_style.hintStyle = SkPaint::kNo_Hinting;
 128     else if (m_style.useHinting == FontRenderStyle::NoPreference)
 129         m_style.hintStyle = skiaHinting;
 130
 131     if (m_style.useBitmaps == FontRenderStyle::NoPreference)
 132         m_style.useBitmaps = useSkiaBitmaps;
 133     if (m_style.useAutoHint == FontRenderStyle::NoPreference)
 134         m_style.useAutoHint = useSkiaAutoHint;
 135     if (m_style.useAntiAlias == FontRenderStyle::NoPreference)
 136         m_style.useAntiAlias = useSkiaAntiAlias;
 137     if (m_style.useSubpixelRendering == FontRenderStyle::NoPreference)
 138         m_style.useSubpixelRendering = useSkiaSubpixelRendering;
 139
 140     // TestRunner specifically toggles the subpixel positioning flag.
 141     if (m_style.useSubpixelPositioning == FontRenderStyle::NoPreference
 142         || isRunningLayoutTest())
 143         m_style.useSubpixelPositioning = useSkiaSubpixelPositioning;
 144 }
 145
 146 bool FontPlatformData::defaultUseSubpixelPositioning()
 147 {
 148     return FontDescription::subpixelPositioning();
 149 }
 150
 151 } // namespace WebCore