1 /* 2 * Copyright (c) 2006, 2007, 2008, 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, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 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 #include "FontPlatformData.h" 33 34 #include "HarfbuzzSkia.h" 35 #include "NotImplemented.h" 36 #include "PlatformBridge.h" 37 #include "PlatformString.h" 38 39 #include "SkAdvancedTypefaceMetrics.h" 40 #include "SkPaint.h" 41 #include "SkTypeface.h" 42 43 #include <wtf/text/StringImpl.h> 44 45 namespace WebCore { 46 47 static SkPaint::Hinting skiaHinting = SkPaint::kNormal_Hinting; 48 static bool isSkiaAntiAlias = true; 49 static bool isSkiaSubpixelGlyphs = false; 50 51 void FontPlatformData::setHinting(SkPaint::Hinting hinting) 52 { 53 skiaHinting = hinting; 54 } 55 56 void FontPlatformData::setAntiAlias(bool isAntiAlias) 57 { 58 isSkiaAntiAlias = isAntiAlias; 59 } 60 61 void FontPlatformData::setSubpixelGlyphs(bool isSubpixelGlyphs) 62 { 63 isSkiaSubpixelGlyphs = isSubpixelGlyphs; 64 } 65 66 FontPlatformData::RefCountedHarfbuzzFace::~RefCountedHarfbuzzFace() 67 { 68 HB_FreeFace(m_harfbuzzFace); 69 } 70 71 FontPlatformData::FontPlatformData(const FontPlatformData& src) 72 : m_typeface(src.m_typeface) 73 , m_family(src.m_family) 74 , m_textSize(src.m_textSize) 75 , m_emSizeInFontUnits(src.m_emSizeInFontUnits) 76 , m_fakeBold(src.m_fakeBold) 77 , m_fakeItalic(src.m_fakeItalic) 78 , m_orientation(src.m_orientation) 79 , m_textOrientation(src.m_textOrientation) 80 , m_style(src.m_style) 81 , m_harfbuzzFace(src.m_harfbuzzFace) 82 { 83 SkSafeRef(m_typeface); 84 } 85 86 FontPlatformData::FontPlatformData(SkTypeface* tf, const char* family, float textSize, bool fakeBold, bool fakeItalic, FontOrientation orientation, TextOrientation textOrientation) 87 : m_typeface(tf) 88 , m_family(family) 89 , m_textSize(textSize) 90 , m_emSizeInFontUnits(0) 91 , m_fakeBold(fakeBold) 92 , m_fakeItalic(fakeItalic) 93 , m_orientation(orientation) 94 , m_textOrientation(textOrientation) 95 { 96 SkSafeRef(m_typeface); 97 querySystemForRenderStyle(); 98 } 99 100 FontPlatformData::FontPlatformData(const FontPlatformData& src, float textSize) 101 : m_typeface(src.m_typeface) 102 , m_family(src.m_family) 103 , m_textSize(textSize) 104 , m_emSizeInFontUnits(src.m_emSizeInFontUnits) 105 , m_fakeBold(src.m_fakeBold) 106 , m_fakeItalic(src.m_fakeItalic) 107 , m_orientation(src.m_orientation) 108 , m_textOrientation(src.m_textOrientation) 109 , m_harfbuzzFace(src.m_harfbuzzFace) 110 { 111 SkSafeRef(m_typeface); 112 querySystemForRenderStyle(); 113 } 114 115 FontPlatformData::~FontPlatformData() 116 { 117 SkSafeUnref(m_typeface); 118 } 119 120 int FontPlatformData::emSizeInFontUnits() const 121 { 122 if (m_emSizeInFontUnits) 123 return m_emSizeInFontUnits; 124 125 SkAdvancedTypefaceMetrics* metrics = m_typeface->getAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo); 126 m_emSizeInFontUnits = metrics->fEmSize; 127 metrics->unref(); 128 return m_emSizeInFontUnits; 129 } 130 131 FontPlatformData& FontPlatformData::operator=(const FontPlatformData& src) 132 { 133 SkRefCnt_SafeAssign(m_typeface, src.m_typeface); 134 135 m_family = src.m_family; 136 m_textSize = src.m_textSize; 137 m_fakeBold = src.m_fakeBold; 138 m_fakeItalic = src.m_fakeItalic; 139 m_harfbuzzFace = src.m_harfbuzzFace; 140 m_orientation = src.m_orientation; 141 m_textOrientation = src.m_textOrientation; 142 m_style = src.m_style; 143 m_emSizeInFontUnits = src.m_emSizeInFontUnits; 144 145 return *this; 146 } 147 148 #ifndef NDEBUG 149 String FontPlatformData::description() const 150 { 151 return String(); 152 } 153 #endif 154 155 void FontPlatformData::setupPaint(SkPaint* paint) const 156 { 157 const float ts = m_textSize >= 0 ? m_textSize : 12; 158 159 paint->setAntiAlias(m_style.useAntiAlias == FontRenderStyle::NoPreference ? isSkiaAntiAlias : m_style.useAntiAlias); 160 switch (m_style.useHinting) { 161 case FontRenderStyle::NoPreference: 162 paint->setHinting(skiaHinting); 163 break; 164 case 0: 165 paint->setHinting(SkPaint::kNo_Hinting); 166 break; 167 default: 168 paint->setHinting(static_cast<SkPaint::Hinting>(m_style.hintStyle)); 169 break; 170 } 171 172 paint->setEmbeddedBitmapText(m_style.useBitmaps); 173 paint->setTextSize(SkFloatToScalar(ts)); 174 paint->setTypeface(m_typeface); 175 paint->setFakeBoldText(m_fakeBold); 176 paint->setTextSkewX(m_fakeItalic ? -SK_Scalar1 / 4 : 0); 177 paint->setAutohinted(m_style.useAutoHint); 178 179 if (m_style.useAntiAlias == 1 || (m_style.useAntiAlias == FontRenderStyle::NoPreference && isSkiaAntiAlias)) 180 paint->setLCDRenderText(m_style.useSubpixel == FontRenderStyle::NoPreference ? isSkiaSubpixelGlyphs : m_style.useSubpixel); 181 } 182 183 SkFontID FontPlatformData::uniqueID() const 184 { 185 return m_typeface->uniqueID(); 186 } 187 188 bool FontPlatformData::operator==(const FontPlatformData& a) const 189 { 190 // If either of the typeface pointers are invalid (either NULL or the 191 // special deleted value) then we test for pointer equality. Otherwise, we 192 // call SkTypeface::Equal on the valid pointers. 193 bool typefacesEqual; 194 if (m_typeface == hashTableDeletedFontValue() 195 || a.m_typeface == hashTableDeletedFontValue() 196 || !m_typeface 197 || !a.m_typeface) 198 typefacesEqual = m_typeface == a.m_typeface; 199 else 200 typefacesEqual = SkTypeface::Equal(m_typeface, a.m_typeface); 201 202 return typefacesEqual 203 && m_textSize == a.m_textSize 204 && m_fakeBold == a.m_fakeBold 205 && m_fakeItalic == a.m_fakeItalic 206 && m_orientation == a.m_orientation 207 && m_textOrientation == a.m_textOrientation 208 && m_style == a.m_style; 209 } 210 211 unsigned FontPlatformData::hash() const 212 { 213 unsigned h = SkTypeface::UniqueID(m_typeface); 214 h ^= 0x01010101 * ((static_cast<int>(m_textOrientation) << 3) | (static_cast<int>(m_orientation) << 2) | (static_cast<int>(m_fakeBold) << 1) | static_cast<int>(m_fakeItalic)); 215 216 // This memcpy is to avoid a reinterpret_cast that breaks strict-aliasing 217 // rules. Memcpy is generally optimized enough so that performance doesn't 218 // matter here. 219 uint32_t textSizeBytes; 220 memcpy(&textSizeBytes, &m_textSize, sizeof(uint32_t)); 221 h ^= textSizeBytes; 222 223 return h; 224 } 225 226 bool FontPlatformData::isFixedPitch() const 227 { 228 notImplemented(); 229 return false; 230 } 231 232 HB_FaceRec_* FontPlatformData::harfbuzzFace() const 233 { 234 if (!m_harfbuzzFace) 235 m_harfbuzzFace = RefCountedHarfbuzzFace::create(HB_NewFace(const_cast<FontPlatformData*>(this), harfbuzzSkiaGetTable)); 236 237 return m_harfbuzzFace->face(); 238 } 239 240 void FontPlatformData::querySystemForRenderStyle() 241 { 242 if (!m_family.length()) { 243 // We don't have a family for this. Probably because it's a webfont. We 244 // set all the values to 'no preference' and take the defaults passed 245 // in from XSETTINGS. 246 m_style.useBitmaps = FontRenderStyle::NoPreference; 247 m_style.useAutoHint = FontRenderStyle::NoPreference; 248 m_style.useHinting = FontRenderStyle::NoPreference; 249 m_style.useAntiAlias = FontRenderStyle::NoPreference; 250 m_style.useSubpixel = FontRenderStyle::NoPreference; 251 return; 252 } 253 254 PlatformBridge::getRenderStyleForStrike(m_family.data(), (((int)m_textSize) << 2) | (m_typeface->style() & 3), &m_style); 255 } 256 257 } // namespace WebCore 258
