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1 /* | 1 /* |
2 * Copyright (C) 2005, 2008, 2010 Apple Inc. All rights reserved. | 2 * Copyright (C) 2005, 2008, 2010 Apple Inc. All rights reserved. |
3 * Copyright (C) 2006 Alexey Proskuryakov | 3 * Copyright (C) 2006 Alexey Proskuryakov |
4 * | 4 * |
5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
6 * modification, are permitted provided that the following conditions | 6 * modification, are permitted provided that the following conditions |
7 * are met: | 7 * are met: |
8 * | 8 * |
9 * 1. Redistributions of source code must retain the above copyright | 9 * 1. Redistributions of source code must retain the above copyright |
10 * notice, this list of conditions and the following disclaimer. | 10 * notice, this list of conditions and the following disclaimer. |
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23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 */ | 28 */ |
29 | 29 |
30 #include "config.h" | 30 #include "config.h" |
31 #include "platform/fonts/SimpleFontData.h" | 31 #include "platform/fonts/SimpleFontData.h" |
32 | 32 |
| 33 #include "SkPaint.h" |
| 34 #include "SkPath.h" |
| 35 #include "SkTypeface.h" |
| 36 #include "SkTypes.h" |
| 37 #include "SkUtils.h" |
| 38 #include "platform/fonts/FontDescription.h" |
| 39 #include "platform/fonts/GlyphPage.h" |
| 40 #include "platform/fonts/VDMXParser.h" |
| 41 #include "platform/geometry/FloatRect.h" |
33 #include "wtf/MathExtras.h" | 42 #include "wtf/MathExtras.h" |
| 43 #include "wtf/unicode/Unicode.h" |
| 44 #include <unicode/normlzr.h> |
34 | 45 |
35 namespace blink { | 46 namespace blink { |
36 | 47 |
37 const float smallCapsFontSizeMultiplier = 0.7f; | 48 const float smallCapsFontSizeMultiplier = 0.7f; |
38 const float emphasisMarkFontSizeMultiplier = 0.5f; | 49 const float emphasisMarkFontSizeMultiplier = 0.5f; |
39 | 50 |
| 51 #if OS(LINUX) || OS(ANDROID) |
| 52 // This is the largest VDMX table which we'll try to load and parse. |
| 53 static const size_t maxVDMXTableSize = 1024 * 1024; // 1 MB |
| 54 #endif |
| 55 |
40 SimpleFontData::SimpleFontData(const FontPlatformData& platformData, PassRefPtr<
CustomFontData> customData, bool isTextOrientationFallback) | 56 SimpleFontData::SimpleFontData(const FontPlatformData& platformData, PassRefPtr<
CustomFontData> customData, bool isTextOrientationFallback) |
41 : m_maxCharWidth(-1) | 57 : m_maxCharWidth(-1) |
42 , m_avgCharWidth(-1) | 58 , m_avgCharWidth(-1) |
43 , m_platformData(platformData) | 59 , m_platformData(platformData) |
44 , m_treatAsFixedPitch(false) | 60 , m_treatAsFixedPitch(false) |
45 , m_isTextOrientationFallback(isTextOrientationFallback) | 61 , m_isTextOrientationFallback(isTextOrientationFallback) |
46 , m_isBrokenIdeographFallback(false) | 62 , m_isBrokenIdeographFallback(false) |
47 #if ENABLE(OPENTYPE_VERTICAL) | 63 #if ENABLE(OPENTYPE_VERTICAL) |
48 , m_verticalData(nullptr) | 64 , m_verticalData(nullptr) |
49 #endif | 65 #endif |
50 , m_hasVerticalGlyphs(false) | 66 , m_hasVerticalGlyphs(false) |
51 , m_customFontData(customData) | 67 , m_customFontData(customData) |
52 { | 68 { |
53 platformInit(); | 69 platformInit(); |
54 platformGlyphInit(); | 70 platformGlyphInit(); |
55 platformCharWidthInit(); | |
56 #if ENABLE(OPENTYPE_VERTICAL) | 71 #if ENABLE(OPENTYPE_VERTICAL) |
57 if (platformData.orientation() == Vertical && !isTextOrientationFallback) { | 72 if (platformData.orientation() == Vertical && !isTextOrientationFallback) { |
58 m_verticalData = platformData.verticalData(); | 73 m_verticalData = platformData.verticalData(); |
59 m_hasVerticalGlyphs = m_verticalData.get() && m_verticalData->hasVertica
lMetrics(); | 74 m_hasVerticalGlyphs = m_verticalData.get() && m_verticalData->hasVertica
lMetrics(); |
60 } | 75 } |
61 #endif | 76 #endif |
62 } | 77 } |
63 | 78 |
64 SimpleFontData::SimpleFontData(PassRefPtr<CustomFontData> customData, float font
Size, bool syntheticBold, bool syntheticItalic) | 79 SimpleFontData::SimpleFontData(PassRefPtr<CustomFontData> customData, float font
Size, bool syntheticBold, bool syntheticItalic) |
65 : m_platformData(FontPlatformData(fontSize, syntheticBold, syntheticItalic)) | 80 : m_platformData(FontPlatformData(fontSize, syntheticBold, syntheticItalic)) |
66 , m_treatAsFixedPitch(false) | 81 , m_treatAsFixedPitch(false) |
67 , m_isTextOrientationFallback(false) | 82 , m_isTextOrientationFallback(false) |
68 , m_isBrokenIdeographFallback(false) | 83 , m_isBrokenIdeographFallback(false) |
69 #if ENABLE(OPENTYPE_VERTICAL) | 84 #if ENABLE(OPENTYPE_VERTICAL) |
70 , m_verticalData(nullptr) | 85 , m_verticalData(nullptr) |
71 #endif | 86 #endif |
72 , m_hasVerticalGlyphs(false) | 87 , m_hasVerticalGlyphs(false) |
73 , m_customFontData(customData) | 88 , m_customFontData(customData) |
74 { | 89 { |
75 if (m_customFontData) | 90 if (m_customFontData) |
76 m_customFontData->initializeFontData(this, fontSize); | 91 m_customFontData->initializeFontData(this, fontSize); |
77 } | 92 } |
78 | 93 |
| 94 void SimpleFontData::platformInit() |
| 95 { |
| 96 if (!m_platformData.size()) { |
| 97 m_fontMetrics.reset(); |
| 98 m_avgCharWidth = 0; |
| 99 m_maxCharWidth = 0; |
| 100 return; |
| 101 } |
| 102 |
| 103 SkPaint paint; |
| 104 SkPaint::FontMetrics metrics; |
| 105 |
| 106 m_platformData.setupPaint(&paint); |
| 107 paint.getFontMetrics(&metrics); |
| 108 SkTypeface* face = paint.getTypeface(); |
| 109 ASSERT(face); |
| 110 |
| 111 int vdmxAscent = 0, vdmxDescent = 0; |
| 112 bool isVDMXValid = false; |
| 113 |
| 114 #if OS(LINUX) || OS(ANDROID) |
| 115 // Manually digging up VDMX metrics is only applicable when bytecode hinting
using FreeType. |
| 116 // With GDI, the metrics will already have taken this into account (as neede
d). |
| 117 // With DirectWrite or CoreText, no bytecode hinting is ever done. |
| 118 // This code should be pushed into FreeType (hinted font metrics). |
| 119 static const uint32_t vdmxTag = SkSetFourByteTag('V', 'D', 'M', 'X'); |
| 120 int pixelSize = m_platformData.size() + 0.5; |
| 121 if (!paint.isAutohinted() |
| 122 && (paint.getHinting() == SkPaint::kFull_Hinting |
| 123 || paint.getHinting() == SkPaint::kNormal_Hinting)) |
| 124 { |
| 125 size_t vdmxSize = face->getTableSize(vdmxTag); |
| 126 if (vdmxSize && vdmxSize < maxVDMXTableSize) { |
| 127 uint8_t* vdmxTable = (uint8_t*) fastMalloc(vdmxSize); |
| 128 if (vdmxTable |
| 129 && face->getTableData(vdmxTag, 0, vdmxSize, vdmxTable) == vdmxSi
ze |
| 130 && parseVDMX(&vdmxAscent, &vdmxDescent, vdmxTable, vdmxSize, pix
elSize)) |
| 131 isVDMXValid = true; |
| 132 fastFree(vdmxTable); |
| 133 } |
| 134 } |
| 135 #endif |
| 136 |
| 137 float ascent; |
| 138 float descent; |
| 139 |
| 140 // Beware those who step here: This code is designed to match Win32 font |
| 141 // metrics *exactly* (except the adjustment of ascent/descent on Linux/Andro
id). |
| 142 if (isVDMXValid) { |
| 143 ascent = vdmxAscent; |
| 144 descent = -vdmxDescent; |
| 145 } else { |
| 146 ascent = SkScalarRoundToInt(-metrics.fAscent); |
| 147 descent = SkScalarRoundToInt(metrics.fDescent); |
| 148 #if OS(LINUX) || OS(ANDROID) |
| 149 // When subpixel positioning is enabled, if the descent is rounded down,
the descent part |
| 150 // of the glyph may be truncated when displayed in a 'overflow: hidden'
container. |
| 151 // To avoid that, borrow 1 unit from the ascent when possible. |
| 152 // FIXME: This can be removed if sub-pixel ascent/descent is supported. |
| 153 if (platformData().fontRenderStyle().useSubpixelPositioning && descent <
SkScalarToFloat(metrics.fDescent) && ascent >= 1) { |
| 154 ++descent; |
| 155 --ascent; |
| 156 } |
| 157 #endif |
| 158 } |
| 159 |
| 160 m_fontMetrics.setAscent(ascent); |
| 161 m_fontMetrics.setDescent(descent); |
| 162 |
| 163 float xHeight; |
| 164 if (metrics.fXHeight) { |
| 165 xHeight = metrics.fXHeight; |
| 166 m_fontMetrics.setXHeight(xHeight); |
| 167 } else { |
| 168 xHeight = ascent * 0.56; // Best guess from Windows font metrics. |
| 169 m_fontMetrics.setXHeight(xHeight); |
| 170 m_fontMetrics.setHasXHeight(false); |
| 171 } |
| 172 |
| 173 float lineGap = SkScalarToFloat(metrics.fLeading); |
| 174 m_fontMetrics.setLineGap(lineGap); |
| 175 m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(li
neGap)); |
| 176 |
| 177 if (platformData().orientation() == Vertical && !isTextOrientationFallback()
) { |
| 178 static const uint32_t vheaTag = SkSetFourByteTag('v', 'h', 'e', 'a'); |
| 179 static const uint32_t vorgTag = SkSetFourByteTag('V', 'O', 'R', 'G'); |
| 180 size_t vheaSize = face->getTableSize(vheaTag); |
| 181 size_t vorgSize = face->getTableSize(vorgTag); |
| 182 if ((vheaSize > 0) || (vorgSize > 0)) |
| 183 m_hasVerticalGlyphs = true; |
| 184 } |
| 185 |
| 186 // In WebKit/WebCore/platform/graphics/SimpleFontData.cpp, m_spaceWidth is |
| 187 // calculated for us, but we need to calculate m_maxCharWidth and |
| 188 // m_avgCharWidth in order for text entry widgets to be sized correctly. |
| 189 #if OS(WIN) |
| 190 m_maxCharWidth = SkScalarRoundToInt(metrics.fMaxCharWidth); |
| 191 |
| 192 // Older version of the DirectWrite API doesn't implement support for max |
| 193 // char width. Fall back on a multiple of the ascent. This is entirely |
| 194 // arbitrary but comes pretty close to the expected value in most cases. |
| 195 if (m_maxCharWidth < 1) |
| 196 m_maxCharWidth = ascent * 2; |
| 197 #else |
| 198 // FIXME: This seems incorrect and should probably use fMaxCharWidth as |
| 199 // the code path above. |
| 200 SkScalar xRange = metrics.fXMax - metrics.fXMin; |
| 201 m_maxCharWidth = SkScalarRoundToInt(xRange * SkScalarRoundToInt(m_platformDa
ta.size())); |
| 202 #endif |
| 203 |
| 204 if (metrics.fAvgCharWidth) { |
| 205 m_avgCharWidth = SkScalarRoundToInt(metrics.fAvgCharWidth); |
| 206 } else { |
| 207 m_avgCharWidth = xHeight; |
| 208 |
| 209 GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->pag
e(); |
| 210 |
| 211 if (glyphPageZero) { |
| 212 static const UChar32 xChar = 'x'; |
| 213 const Glyph xGlyph = glyphPageZero->glyphForCharacter(xChar); |
| 214 |
| 215 if (xGlyph) { |
| 216 // In widthForGlyph(), xGlyph will be compared with |
| 217 // m_zeroWidthSpaceGlyph, which isn't initialized yet here. |
| 218 // Initialize it with zero to make sure widthForGlyph() returns |
| 219 // the right width. |
| 220 m_zeroWidthSpaceGlyph = 0; |
| 221 m_avgCharWidth = widthForGlyph(xGlyph); |
| 222 } |
| 223 } |
| 224 } |
| 225 |
| 226 if (int unitsPerEm = face->getUnitsPerEm()) |
| 227 m_fontMetrics.setUnitsPerEm(unitsPerEm); |
| 228 } |
| 229 |
79 void SimpleFontData::platformGlyphInit() | 230 void SimpleFontData::platformGlyphInit() |
80 { | 231 { |
81 GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page(); | 232 GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page(); |
82 if (!glyphPageZero) { | 233 if (!glyphPageZero) { |
83 m_spaceGlyph = 0; | 234 m_spaceGlyph = 0; |
84 m_spaceWidth = 0; | 235 m_spaceWidth = 0; |
85 m_zeroGlyph = 0; | 236 m_zeroGlyph = 0; |
86 determinePitch(); | 237 determinePitch(); |
87 m_zeroWidthSpaceGlyph = 0; | 238 m_zeroWidthSpaceGlyph = 0; |
88 m_missingGlyphData.fontData = this; | 239 m_missingGlyphData.fontData = this; |
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111 m_zeroWidthSpaceGlyph = 0; | 262 m_zeroWidthSpaceGlyph = 0; |
112 WTF_LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. G
lyph width will not be overridden."); | 263 WTF_LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. G
lyph width will not be overridden."); |
113 } | 264 } |
114 | 265 |
115 m_missingGlyphData.fontData = this; | 266 m_missingGlyphData.fontData = this; |
116 m_missingGlyphData.glyph = 0; | 267 m_missingGlyphData.glyph = 0; |
117 } | 268 } |
118 | 269 |
119 SimpleFontData::~SimpleFontData() | 270 SimpleFontData::~SimpleFontData() |
120 { | 271 { |
121 if (!isSVGFont()) | |
122 platformDestroy(); | |
123 | |
124 if (isCustomFont()) | 272 if (isCustomFont()) |
125 GlyphPageTreeNode::pruneTreeCustomFontData(this); | 273 GlyphPageTreeNode::pruneTreeCustomFontData(this); |
126 else | 274 else |
127 GlyphPageTreeNode::pruneTreeFontData(this); | 275 GlyphPageTreeNode::pruneTreeFontData(this); |
128 } | 276 } |
129 | 277 |
130 const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const | 278 const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const |
131 { | 279 { |
132 return this; | 280 return this; |
133 } | 281 } |
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220 | 368 |
221 PassRefPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescri
ption& fontDescription, float scaleFactor) const | 369 PassRefPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescri
ption& fontDescription, float scaleFactor) const |
222 { | 370 { |
223 // FIXME: Support scaled SVG fonts. Given that SVG is scalable in general th
is should be achievable. | 371 // FIXME: Support scaled SVG fonts. Given that SVG is scalable in general th
is should be achievable. |
224 if (isSVGFont()) | 372 if (isSVGFont()) |
225 return nullptr; | 373 return nullptr; |
226 | 374 |
227 return platformCreateScaledFontData(fontDescription, scaleFactor); | 375 return platformCreateScaledFontData(fontDescription, scaleFactor); |
228 } | 376 } |
229 | 377 |
| 378 |
| 379 |
| 380 PassRefPtr<SimpleFontData> SimpleFontData::platformCreateScaledFontData(const Fo
ntDescription& fontDescription, float scaleFactor) const |
| 381 { |
| 382 const float scaledSize = lroundf(fontDescription.computedSize() * scaleFacto
r); |
| 383 return SimpleFontData::create(FontPlatformData(m_platformData, scaledSize),
isCustomFont() ? CustomFontData::create() : nullptr); |
| 384 } |
| 385 |
| 386 void SimpleFontData::determinePitch() |
| 387 { |
| 388 m_treatAsFixedPitch = platformData().isFixedPitch(); |
| 389 } |
| 390 |
| 391 static inline void getSkiaBoundsForGlyph(SkPaint& paint, Glyph glyph, SkRect& bo
unds) |
| 392 { |
| 393 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); |
| 394 |
| 395 SkPath path; |
| 396 paint.getTextPath(&glyph, sizeof(glyph), 0, 0, &path); |
| 397 bounds = path.getBounds(); |
| 398 |
| 399 if (!paint.isSubpixelText()) { |
| 400 SkIRect ir; |
| 401 bounds.round(&ir); |
| 402 bounds.set(ir); |
| 403 } |
| 404 } |
| 405 |
| 406 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const |
| 407 { |
| 408 if (!m_platformData.size()) |
| 409 return FloatRect(); |
| 410 |
| 411 SkASSERT(sizeof(glyph) == 2); // compile-time assert |
| 412 |
| 413 SkPaint paint; |
| 414 m_platformData.setupPaint(&paint); |
| 415 |
| 416 SkRect bounds; |
| 417 getSkiaBoundsForGlyph(paint, glyph, bounds); |
| 418 return FloatRect(bounds); |
| 419 } |
| 420 |
| 421 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const |
| 422 { |
| 423 if (!m_platformData.size()) |
| 424 return 0; |
| 425 |
| 426 SkASSERT(sizeof(glyph) == 2); // compile-time assert |
| 427 |
| 428 SkPaint paint; |
| 429 |
| 430 m_platformData.setupPaint(&paint); |
| 431 |
| 432 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); |
| 433 SkScalar width = paint.measureText(&glyph, 2); |
| 434 if (!paint.isSubpixelText()) |
| 435 width = SkScalarRoundToInt(width); |
| 436 return SkScalarToFloat(width); |
| 437 } |
| 438 |
| 439 bool SimpleFontData::canRenderCombiningCharacterSequence(const UChar* characters
, size_t length) const |
| 440 { |
| 441 if (!m_combiningCharacterSequenceSupport) |
| 442 m_combiningCharacterSequenceSupport = adoptPtr(new HashMap<String, bool>
); |
| 443 |
| 444 WTF::HashMap<String, bool>::AddResult addResult = m_combiningCharacterSequen
ceSupport->add(String(characters, length), false); |
| 445 if (!addResult.isNewEntry) |
| 446 return addResult.storedValue->value; |
| 447 |
| 448 UErrorCode error = U_ZERO_ERROR; |
| 449 Vector<UChar, 4> normalizedCharacters(length); |
| 450 int32_t normalizedLength = unorm_normalize(characters, length, UNORM_NFC, UN
ORM_UNICODE_3_2, &normalizedCharacters[0], length, &error); |
| 451 // Can't render if we have an error or no composition occurred. |
| 452 if (U_FAILURE(error) || (static_cast<size_t>(normalizedLength) == length)) |
| 453 return false; |
| 454 |
| 455 SkPaint paint; |
| 456 m_platformData.setupPaint(&paint); |
| 457 paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); |
| 458 if (paint.textToGlyphs(&normalizedCharacters[0], normalizedLength * 2, 0)) { |
| 459 addResult.storedValue->value = true; |
| 460 return true; |
| 461 } |
| 462 return false; |
| 463 } |
| 464 |
| 465 bool SimpleFontData::fillGlyphPage(GlyphPage* pageToFill, unsigned offset, unsig
ned length, UChar* buffer, unsigned bufferLength) const |
| 466 { |
| 467 if (SkUTF16_IsHighSurrogate(buffer[bufferLength-1])) { |
| 468 SkDebugf("%s last char is high-surrogate", __FUNCTION__); |
| 469 return false; |
| 470 } |
| 471 |
| 472 SkAutoSTMalloc<GlyphPage::size, uint16_t> glyphStorage(length); |
| 473 |
| 474 uint16_t* glyphs = glyphStorage.get(); |
| 475 SkTypeface* typeface = platformData().typeface(); |
| 476 typeface->charsToGlyphs(buffer, SkTypeface::kUTF16_Encoding, glyphs, length)
; |
| 477 |
| 478 bool haveGlyphs = false; |
| 479 for (unsigned i = 0; i < length; i++) { |
| 480 if (glyphs[i]) { |
| 481 pageToFill->setGlyphDataForIndex(offset + i, glyphs[i], this); |
| 482 haveGlyphs = true; |
| 483 } |
| 484 } |
| 485 |
| 486 return haveGlyphs; |
| 487 } |
| 488 |
230 } // namespace blink | 489 } // namespace blink |
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