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| 1 /* | |
| 2 * Copyright (c) 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, | |
| 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 "core/platform/graphics/SimpleFontData.h" | |
| 33 | |
| 34 #include <unicode/normlzr.h> | |
| 35 #include "SkPaint.h" | |
| 36 #include "SkPath.h" | |
| 37 #include "SkTypeface.h" | |
| 38 #include "SkTypes.h" | |
| 39 #include "core/platform/graphics/VDMXParser.h" | |
| 40 #include "platform/fonts/FontDescription.h" | |
| 41 #include "platform/geometry/FloatRect.h" | |
| 42 #include "wtf/unicode/Unicode.h" | |
| 43 | |
| 44 #if OS(WIN) | |
| 45 #include "platform/win/HWndDC.h" | |
| 46 #endif | |
| 47 | |
| 48 namespace WebCore { | |
| 49 | |
| 50 // This is the largest VDMX table which we'll try to load and parse. | |
| 51 static const size_t maxVDMXTableSize = 1024 * 1024; // 1 MB | |
| 52 | |
| 53 void SimpleFontData::platformInit() | |
| 54 { | |
| 55 if (!m_platformData.size()) { | |
| 56 m_fontMetrics.reset(); | |
| 57 m_avgCharWidth = 0; | |
| 58 m_maxCharWidth = 0; | |
| 59 return; | |
| 60 } | |
| 61 | |
| 62 SkPaint paint; | |
| 63 SkPaint::FontMetrics metrics; | |
| 64 | |
| 65 m_platformData.setupPaint(&paint); | |
| 66 paint.getFontMetrics(&metrics); | |
| 67 SkTypeface* face = paint.getTypeface(); | |
| 68 ASSERT(face); | |
| 69 | |
| 70 static const uint32_t vdmxTag = SkSetFourByteTag('V', 'D', 'M', 'X'); | |
| 71 int pixelSize = m_platformData.size() + 0.5; | |
| 72 int vdmxAscent, vdmxDescent; | |
| 73 bool isVDMXValid = false; | |
| 74 | |
| 75 size_t vdmxSize = face->getTableSize(vdmxTag); | |
| 76 if (vdmxSize && vdmxSize < maxVDMXTableSize) { | |
| 77 uint8_t* vdmxTable = (uint8_t*) fastMalloc(vdmxSize); | |
| 78 if (vdmxTable | |
| 79 && face->getTableData(vdmxTag, 0, vdmxSize, vdmxTable) == vdmxSize | |
| 80 && parseVDMX(&vdmxAscent, &vdmxDescent, vdmxTable, vdmxSize, pixelSi
ze)) | |
| 81 isVDMXValid = true; | |
| 82 fastFree(vdmxTable); | |
| 83 } | |
| 84 | |
| 85 float ascent; | |
| 86 float descent; | |
| 87 | |
| 88 // Beware those who step here: This code is designed to match Win32 font | |
| 89 // metrics *exactly* (except the adjustment of ascent/descent on Linux/Andro
id). | |
| 90 if (isVDMXValid) { | |
| 91 ascent = vdmxAscent; | |
| 92 descent = -vdmxDescent; | |
| 93 } else { | |
| 94 ascent = SkScalarRound(-metrics.fAscent); | |
| 95 descent = SkScalarRound(metrics.fDescent); | |
| 96 #if OS(LINUX) || OS(ANDROID) | |
| 97 // When subpixel positioning is enabled, if the descent is rounded down,
the descent part | |
| 98 // of the glyph may be truncated when displayed in a 'overflow: hidden'
container. | |
| 99 // To avoid that, borrow 1 unit from the ascent when possible. | |
| 100 // FIXME: This can be removed if sub-pixel ascent/descent is supported. | |
| 101 if (platformData().fontRenderStyle().useSubpixelPositioning && descent <
SkScalarToFloat(metrics.fDescent) && ascent >= 1) { | |
| 102 ++descent; | |
| 103 --ascent; | |
| 104 } | |
| 105 #endif | |
| 106 } | |
| 107 | |
| 108 m_fontMetrics.setAscent(ascent); | |
| 109 m_fontMetrics.setDescent(descent); | |
| 110 | |
| 111 float xHeight; | |
| 112 if (metrics.fXHeight) { | |
| 113 xHeight = metrics.fXHeight; | |
| 114 m_fontMetrics.setXHeight(xHeight); | |
| 115 } else { | |
| 116 xHeight = ascent * 0.56; // Best guess from Windows font metrics. | |
| 117 m_fontMetrics.setXHeight(xHeight); | |
| 118 m_fontMetrics.setHasXHeight(false); | |
| 119 } | |
| 120 | |
| 121 float lineGap = SkScalarToFloat(metrics.fLeading); | |
| 122 m_fontMetrics.setLineGap(lineGap); | |
| 123 m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(li
neGap)); | |
| 124 | |
| 125 if (platformData().orientation() == Vertical && !isTextOrientationFallback()
) { | |
| 126 static const uint32_t vheaTag = SkSetFourByteTag('v', 'h', 'e', 'a'); | |
| 127 static const uint32_t vorgTag = SkSetFourByteTag('V', 'O', 'R', 'G'); | |
| 128 size_t vheaSize = face->getTableSize(vheaTag); | |
| 129 size_t vorgSize = face->getTableSize(vorgTag); | |
| 130 if ((vheaSize > 0) || (vorgSize > 0)) | |
| 131 m_hasVerticalGlyphs = true; | |
| 132 } | |
| 133 | |
| 134 // In WebKit/WebCore/platform/graphics/SimpleFontData.cpp, m_spaceWidth is | |
| 135 // calculated for us, but we need to calculate m_maxCharWidth and | |
| 136 // m_avgCharWidth in order for text entry widgets to be sized correctly. | |
| 137 #if OS(WIN) | |
| 138 m_maxCharWidth = SkScalarRound(metrics.fMaxCharWidth); | |
| 139 #else | |
| 140 // FIXME: This seems incorrect and should probably use fMaxCharWidth as | |
| 141 // the code path above. | |
| 142 SkScalar xRange = metrics.fXMax - metrics.fXMin; | |
| 143 m_maxCharWidth = SkScalarRound(xRange * SkScalarRound(m_platformData.size())
); | |
| 144 #endif | |
| 145 | |
| 146 if (metrics.fAvgCharWidth) | |
| 147 m_avgCharWidth = SkScalarRound(metrics.fAvgCharWidth); | |
| 148 else { | |
| 149 m_avgCharWidth = xHeight; | |
| 150 | |
| 151 GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->pag
e(); | |
| 152 | |
| 153 if (glyphPageZero) { | |
| 154 static const UChar32 xChar = 'x'; | |
| 155 const Glyph xGlyph = glyphPageZero->glyphForCharacter(xChar); | |
| 156 | |
| 157 if (xGlyph) { | |
| 158 // In widthForGlyph(), xGlyph will be compared with | |
| 159 // m_zeroWidthSpaceGlyph, which isn't initialized yet here. | |
| 160 // Initialize it with zero to make sure widthForGlyph() returns | |
| 161 // the right width. | |
| 162 m_zeroWidthSpaceGlyph = 0; | |
| 163 m_avgCharWidth = widthForGlyph(xGlyph); | |
| 164 } | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 if (int unitsPerEm = face->getUnitsPerEm()) | |
| 169 m_fontMetrics.setUnitsPerEm(unitsPerEm); | |
| 170 } | |
| 171 | |
| 172 void SimpleFontData::platformCharWidthInit() | |
| 173 { | |
| 174 // charwidths are set in platformInit. | |
| 175 } | |
| 176 | |
| 177 void SimpleFontData::platformDestroy() | |
| 178 { | |
| 179 } | |
| 180 | |
| 181 PassRefPtr<SimpleFontData> SimpleFontData::platformCreateScaledFontData(const Fo
ntDescription& fontDescription, float scaleFactor) const | |
| 182 { | |
| 183 const float scaledSize = lroundf(fontDescription.computedSize() * scaleFacto
r); | |
| 184 return SimpleFontData::create(FontPlatformData(m_platformData, scaledSize),
isCustomFont() ? CustomFontData::create(false) : 0); | |
| 185 } | |
| 186 | |
| 187 bool SimpleFontData::containsCharacters(const UChar* characters, int length) con
st | |
| 188 { | |
| 189 SkPaint paint; | |
| 190 static const unsigned maxBufferCount = 64; | |
| 191 uint16_t glyphs[maxBufferCount]; | |
| 192 | |
| 193 m_platformData.setupPaint(&paint); | |
| 194 paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); | |
| 195 | |
| 196 while (length > 0) { | |
| 197 int n = SkMin32(length, SK_ARRAY_COUNT(glyphs)); | |
| 198 | |
| 199 // textToGlyphs takes a byte count so we double the character count. | |
| 200 int count = paint.textToGlyphs(characters, n * 2, glyphs); | |
| 201 for (int i = 0; i < count; i++) { | |
| 202 if (!glyphs[i]) | |
| 203 return false; // missing glyph | |
| 204 } | |
| 205 | |
| 206 characters += n; | |
| 207 length -= n; | |
| 208 } | |
| 209 | |
| 210 return true; | |
| 211 } | |
| 212 | |
| 213 void SimpleFontData::determinePitch() | |
| 214 { | |
| 215 m_treatAsFixedPitch = platformData().isFixedPitch(); | |
| 216 } | |
| 217 | |
| 218 static inline void getSkiaBoundsForGlyph(SkPaint& paint, Glyph glyph, SkRect& bo
unds) | |
| 219 { | |
| 220 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
| 221 | |
| 222 SkPath path; | |
| 223 paint.getTextPath(&glyph, sizeof(glyph), 0, 0, &path); | |
| 224 bounds = path.getBounds(); | |
| 225 | |
| 226 // FIXME(eae): getBounds currently returns an empty rect for bitmap | |
| 227 // fonts so fall back on the old behavior. Once fixed in Skia this | |
| 228 // fallback can go away. | |
| 229 if (bounds.isEmpty()) | |
| 230 paint.measureText(&glyph, 2, &bounds); | |
| 231 | |
| 232 if (!paint.isSubpixelText()) { | |
| 233 SkIRect ir; | |
| 234 bounds.round(&ir); | |
| 235 bounds.set(ir); | |
| 236 } | |
| 237 } | |
| 238 | |
| 239 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const | |
| 240 { | |
| 241 if (!m_platformData.size()) | |
| 242 return FloatRect(); | |
| 243 | |
| 244 SkASSERT(sizeof(glyph) == 2); // compile-time assert | |
| 245 | |
| 246 SkPaint paint; | |
| 247 m_platformData.setupPaint(&paint); | |
| 248 | |
| 249 SkRect bounds; | |
| 250 getSkiaBoundsForGlyph(paint, glyph, bounds); | |
| 251 return FloatRect(bounds); | |
| 252 } | |
| 253 | |
| 254 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const | |
| 255 { | |
| 256 if (!m_platformData.size()) | |
| 257 return 0; | |
| 258 | |
| 259 SkASSERT(sizeof(glyph) == 2); // compile-time assert | |
| 260 | |
| 261 SkPaint paint; | |
| 262 | |
| 263 m_platformData.setupPaint(&paint); | |
| 264 | |
| 265 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
| 266 SkScalar width = paint.measureText(&glyph, 2); | |
| 267 if (!paint.isSubpixelText()) | |
| 268 width = SkScalarRound(width); | |
| 269 return SkScalarToFloat(width); | |
| 270 } | |
| 271 | |
| 272 #if USE(HARFBUZZ) | |
| 273 bool SimpleFontData::canRenderCombiningCharacterSequence(const UChar* characters
, size_t length) const | |
| 274 { | |
| 275 if (!m_combiningCharacterSequenceSupport) | |
| 276 m_combiningCharacterSequenceSupport = adoptPtr(new HashMap<String, bool>
); | |
| 277 | |
| 278 WTF::HashMap<String, bool>::AddResult addResult = m_combiningCharacterSequen
ceSupport->add(String(characters, length), false); | |
| 279 if (!addResult.isNewEntry) | |
| 280 return addResult.iterator->value; | |
| 281 | |
| 282 UErrorCode error = U_ZERO_ERROR; | |
| 283 Vector<UChar, 4> normalizedCharacters(length); | |
| 284 int32_t normalizedLength = unorm_normalize(characters, length, UNORM_NFC, UN
ORM_UNICODE_3_2, &normalizedCharacters[0], length, &error); | |
| 285 // Can't render if we have an error or no composition occurred. | |
| 286 if (U_FAILURE(error) || (static_cast<size_t>(normalizedLength) == length)) | |
| 287 return false; | |
| 288 | |
| 289 SkPaint paint; | |
| 290 m_platformData.setupPaint(&paint); | |
| 291 paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); | |
| 292 if (paint.textToGlyphs(&normalizedCharacters[0], normalizedLength * 2, 0)) { | |
| 293 addResult.iterator->value = true; | |
| 294 return true; | |
| 295 } | |
| 296 return false; | |
| 297 } | |
| 298 #endif | |
| 299 | |
| 300 } // namespace WebCore | |
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Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk