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| 1 /* | |
| 2 * Copyright (c) 2006, 2007, 2008, 2009, 2012 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/win/UniscribeHelper.h" | |
| 33 | |
| 34 #include "core/platform/graphics/Font.h" | |
| 35 #include "core/platform/graphics/GraphicsContext.h" | |
| 36 #include "core/platform/graphics/skia/SkiaFontWin.h" | |
| 37 #include "platform/fonts/FontFallbackWin.h" | |
| 38 #include "platform/win/HWndDC.h" | |
| 39 #include "third_party/skia/include/core/SkPoint.h" | |
| 40 #include "wtf/Assertions.h" | |
| 41 | |
| 42 namespace WebCore { | |
| 43 | |
| 44 // The function types for ScriptItemizeOpenType() and ScriptShapeOpenType(). | |
| 45 // We want to use these functions for OpenType feature support, but we can't | |
| 46 // call them directly because usp10.dll does not always have them. | |
| 47 // Instead, we use GetProcAddress() to check whether we can actually use these | |
| 48 // function. If we can't use these functions, we substitute ScriptItemze() and | |
| 49 // ScriptShape(). | |
| 50 typedef HRESULT (WINAPI *ScriptItemizeOpenTypeFunc)(const WCHAR*, int, int, | |
| 51 const SCRIPT_CONTROL*, | |
| 52 const SCRIPT_STATE*, | |
| 53 SCRIPT_ITEM*, | |
| 54 OPENTYPE_TAG*, int*); | |
| 55 typedef HRESULT (WINAPI *ScriptShapeOpenTypeFunc)(HDC, SCRIPT_CACHE*, | |
| 56 SCRIPT_ANALYSIS*, | |
| 57 OPENTYPE_TAG, OPENTYPE_TAG, | |
| 58 int*, TEXTRANGE_PROPERTIES**, | |
| 59 int, const WCHAR*, int, int, | |
| 60 WORD*, SCRIPT_CHARPROP*, | |
| 61 WORD*, SCRIPT_GLYPHPROP*, | |
| 62 int*); | |
| 63 | |
| 64 static ScriptItemizeOpenTypeFunc gScriptItemizeOpenTypeFunc = 0; | |
| 65 static ScriptShapeOpenTypeFunc gScriptShapeOpenTypeFunc = 0; | |
| 66 static bool gOpenTypeFunctionsLoaded = false; | |
| 67 | |
| 68 static void loadOpenTypeFunctions() | |
| 69 { | |
| 70 HMODULE hModule = GetModuleHandle(L"usp10"); | |
| 71 if (hModule) { | |
| 72 gScriptItemizeOpenTypeFunc = reinterpret_cast<ScriptItemizeOpenTypeFunc>
(GetProcAddress(hModule, "ScriptItemizeOpenType")); | |
| 73 gScriptShapeOpenTypeFunc = reinterpret_cast<ScriptShapeOpenTypeFunc>(Get
ProcAddress(hModule, "ScriptShapeOpenType")); | |
| 74 } | |
| 75 if (!gScriptItemizeOpenTypeFunc || !gScriptShapeOpenTypeFunc) { | |
| 76 gScriptItemizeOpenTypeFunc = 0; | |
| 77 gScriptShapeOpenTypeFunc = 0; | |
| 78 } | |
| 79 gOpenTypeFunctionsLoaded = true; | |
| 80 } | |
| 81 | |
| 82 enum { | |
| 83 FontStyleNormal = 0, | |
| 84 FontStyleBold = 1, | |
| 85 FontStyleItalic = 2, | |
| 86 FontStyleUnderlined = 4 | |
| 87 }; | |
| 88 | |
| 89 int getStyleFromLogfont(const LOGFONT* logfont) | |
| 90 { | |
| 91 // FIXME: consider defining UNDEFINED or INVALID for style and | |
| 92 // returning it when logfont is 0 | |
| 93 if (!logfont) { | |
| 94 ASSERT_NOT_REACHED(); | |
| 95 return FontStyleNormal; | |
| 96 } | |
| 97 return (logfont->lfItalic ? FontStyleItalic : FontStyleNormal) | | |
| 98 (logfont->lfUnderline ? FontStyleUnderlined : FontStyleNormal) | | |
| 99 (logfont->lfWeight >= 700 ? FontStyleBold : FontStyleNormal); | |
| 100 } | |
| 101 | |
| 102 | |
| 103 // HFONT is the 'incarnation' of 'everything' about font, but it's an opaque | |
| 104 // handle and we can't directly query it to make a new HFONT sharing | |
| 105 // its characteristics (height, style, etc) except for family name. | |
| 106 // This function uses GetObject to convert HFONT back to LOGFONT, | |
| 107 // resets the fields of LOGFONT and calculates style to use later | |
| 108 // for the creation of a font identical to HFONT other than family name. | |
| 109 static void setLogFontAndStyle(HFONT hfont, LOGFONT *logfont, int *style) | |
| 110 { | |
| 111 ASSERT(hfont && logfont); | |
| 112 if (!hfont || !logfont) | |
| 113 return; | |
| 114 | |
| 115 GetObject(hfont, sizeof(LOGFONT), logfont); | |
| 116 // We reset these fields to values appropriate for CreateFontIndirect. | |
| 117 // while keeping lfHeight, which is the most important value in creating | |
| 118 // a new font similar to hfont. | |
| 119 logfont->lfWidth = 0; | |
| 120 logfont->lfEscapement = 0; | |
| 121 logfont->lfOrientation = 0; | |
| 122 logfont->lfCharSet = DEFAULT_CHARSET; | |
| 123 logfont->lfOutPrecision = OUT_TT_ONLY_PRECIS; | |
| 124 logfont->lfQuality = DEFAULT_QUALITY; // Honor user's desktop settings. | |
| 125 logfont->lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE; | |
| 126 if (style) | |
| 127 *style = getStyleFromLogfont(logfont); | |
| 128 } | |
| 129 | |
| 130 // This memory DC will NOT be released but it's OK | |
| 131 // since we want to keep it for the whole life span of the process. | |
| 132 HDC UniscribeHelper::m_cachedDC = 0; | |
| 133 | |
| 134 static bool canUseGlyphIndex(const SCRIPT_ITEM& run) | |
| 135 { | |
| 136 // On early version of Uniscribe, ScriptShape() sets run.a.fNoGlyphIndex | |
| 137 // to TRUE when it can't shape the run with glyph indexes. This could | |
| 138 // occur when we use CFF webfonts(See http://crbug.com/39017). | |
| 139 // We don't use the font in that case and try to use fallback fonts. | |
| 140 return !run.a.fNoGlyphIndex; | |
| 141 } | |
| 142 | |
| 143 UniscribeHelper::UniscribeHelper(const UChar* input, | |
| 144 int inputLength, | |
| 145 bool isRtl, | |
| 146 HFONT hfont, | |
| 147 SCRIPT_CACHE* scriptCache, | |
| 148 SCRIPT_FONTPROPERTIES* fontProperties, | |
| 149 WORD spaceGlyph) | |
| 150 : m_input(input) | |
| 151 , m_inputLength(inputLength) | |
| 152 , m_isRtl(isRtl) | |
| 153 , m_hfont(hfont) | |
| 154 , m_scriptCache(scriptCache) | |
| 155 , m_fontProperties(fontProperties) | |
| 156 , m_spaceGlyph(spaceGlyph) | |
| 157 , m_directionalOverride(false) | |
| 158 , m_inhibitLigate(false) | |
| 159 , m_letterSpacing(0) | |
| 160 , m_spaceWidth(0) | |
| 161 , m_wordSpacing(0) | |
| 162 , m_ascent(0) | |
| 163 , m_disableFontFallback(false) | |
| 164 | |
| 165 { | |
| 166 m_logfont.lfFaceName[0] = 0; | |
| 167 if (!gOpenTypeFunctionsLoaded) | |
| 168 loadOpenTypeFunctions(); | |
| 169 } | |
| 170 | |
| 171 UniscribeHelper::~UniscribeHelper() | |
| 172 { | |
| 173 } | |
| 174 | |
| 175 void UniscribeHelper::initWithOptionalLengthProtection(bool lengthProtection) | |
| 176 { | |
| 177 // We cap the input length and just don't do anything. We'll allocate a lot | |
| 178 // of things of the size of the number of characters, so the allocated | |
| 179 // memory will be several times the input length. Plus shaping such a large | |
| 180 // buffer may be a form of denial of service. No legitimate text should be | |
| 181 // this long. It also appears that Uniscribe flatly rejects very long | |
| 182 // strings, so we don't lose anything by doing this. | |
| 183 // | |
| 184 // The input length protection may be disabled by the unit tests to cause | |
| 185 // an error condition. | |
| 186 static const int kMaxInputLength = 65535; | |
| 187 if (m_inputLength == 0 || (lengthProtection && m_inputLength > kMaxInputLeng
th)) | |
| 188 return; | |
| 189 | |
| 190 fillRuns(); | |
| 191 fillShapes(); | |
| 192 fillScreenOrder(); | |
| 193 } | |
| 194 | |
| 195 int UniscribeHelper::width() const | |
| 196 { | |
| 197 int width = 0; | |
| 198 for (int itemIndex = 0; itemIndex < static_cast<int>(m_runs.size()); itemInd
ex++) | |
| 199 width += advanceForItem(itemIndex); | |
| 200 return width; | |
| 201 } | |
| 202 | |
| 203 void UniscribeHelper::justify(int additionalSpace) | |
| 204 { | |
| 205 // Count the total number of glyphs we have so we know how big to make the | |
| 206 // buffers below. | |
| 207 int totalGlyphs = 0; | |
| 208 for (size_t run = 0; run < m_runs.size(); run++) { | |
| 209 int runIndex = m_screenOrder[run]; | |
| 210 totalGlyphs += static_cast<int>(m_shapes[runIndex].glyphLength()); | |
| 211 } | |
| 212 if (totalGlyphs == 0) | |
| 213 return; // Nothing to do. | |
| 214 | |
| 215 // We make one big buffer in screen order of all the glyphs we are drawing | |
| 216 // across runs so that the justification function will adjust evenly across | |
| 217 // all glyphs. | |
| 218 Vector<SCRIPT_VISATTR, 64> visualAttributes; | |
| 219 visualAttributes.resize(totalGlyphs); | |
| 220 Vector<int, 64> advances; | |
| 221 advances.resize(totalGlyphs); | |
| 222 Vector<int, 64> justify; | |
| 223 justify.resize(totalGlyphs); | |
| 224 | |
| 225 // Build the packed input. | |
| 226 int destIndex = 0; | |
| 227 for (size_t run = 0; run < m_runs.size(); run++) { | |
| 228 int runIndex = m_screenOrder[run]; | |
| 229 const Shaping& shaping = m_shapes[runIndex]; | |
| 230 | |
| 231 for (int i = 0; i < shaping.glyphLength(); i++, destIndex++) { | |
| 232 memcpy(&visualAttributes[destIndex], &shaping.m_visualAttributes[i], | |
| 233 sizeof(SCRIPT_VISATTR)); | |
| 234 advances[destIndex] = shaping.m_advance[i]; | |
| 235 } | |
| 236 } | |
| 237 | |
| 238 // The documentation for Scriptjustify is wrong, the parameter is the space | |
| 239 // to add and not the width of the column you want. | |
| 240 int minKashida; | |
| 241 // Disable kashida justification based on | |
| 242 // http://blogs.msdn.com/b/michkap/archive/2010/08/31/10056140.aspx. | |
| 243 for (int i = 0; i < totalGlyphs; ++i) { | |
| 244 if (visualAttributes[i].uJustification == SCRIPT_JUSTIFY_ARABIC_KASHIDA) | |
| 245 visualAttributes[i].uJustification = SCRIPT_JUSTIFY_NONE; | |
| 246 } | |
| 247 minKashida = 0; | |
| 248 ScriptJustify(&visualAttributes[0], &advances[0], totalGlyphs, | |
| 249 additionalSpace, minKashida, &justify[0]); | |
| 250 | |
| 251 // Now we have to unpack the justification amounts back into the runs so | |
| 252 // the glyph indices match. | |
| 253 int globalGlyphIndex = 0; | |
| 254 for (size_t run = 0; run < m_runs.size(); run++) { | |
| 255 int runIndex = m_screenOrder[run]; | |
| 256 Shaping& shaping = m_shapes[runIndex]; | |
| 257 | |
| 258 shaping.m_justify.resize(shaping.glyphLength()); | |
| 259 for (int i = 0; i < shaping.glyphLength(); i++, globalGlyphIndex++) | |
| 260 shaping.m_justify[i] = justify[globalGlyphIndex]; | |
| 261 } | |
| 262 } | |
| 263 | |
| 264 int UniscribeHelper::characterToX(int offset) const | |
| 265 { | |
| 266 HRESULT hr; | |
| 267 ASSERT(offset <= m_inputLength); | |
| 268 | |
| 269 // Our algorithm is to traverse the items in screen order from left to | |
| 270 // right, adding in each item's screen width until we find the item with | |
| 271 // the requested character in it. | |
| 272 int width = 0; | |
| 273 for (size_t screenIndex = 0; screenIndex < m_runs.size(); screenIndex++) { | |
| 274 // Compute the length of this run. | |
| 275 int itemIndex = m_screenOrder[screenIndex]; | |
| 276 const SCRIPT_ITEM& item = m_runs[itemIndex]; | |
| 277 const Shaping& shaping = m_shapes[itemIndex]; | |
| 278 int itemLength = shaping.charLength(); | |
| 279 | |
| 280 if (offset >= item.iCharPos && offset <= item.iCharPos + itemLength) { | |
| 281 // Character offset is in this run. | |
| 282 int charLength = offset - item.iCharPos; | |
| 283 | |
| 284 int curX = 0; | |
| 285 hr = ScriptCPtoX(charLength, FALSE, itemLength, | |
| 286 shaping.glyphLength(), | |
| 287 &shaping.m_logs[0], &shaping.m_visualAttributes[0], | |
| 288 shaping.effectiveAdvances(), &item.a, &curX); | |
| 289 if (FAILED(hr)) | |
| 290 return 0; | |
| 291 | |
| 292 width += curX + shaping.m_prePadding; | |
| 293 ASSERT(width >= 0); | |
| 294 return width; | |
| 295 } | |
| 296 | |
| 297 // Move to the next item. | |
| 298 width += advanceForItem(itemIndex); | |
| 299 } | |
| 300 ASSERT(width >= 0); | |
| 301 return width; | |
| 302 } | |
| 303 | |
| 304 int UniscribeHelper::xToCharacter(int x) const | |
| 305 { | |
| 306 // We iterate in screen order until we find the item with the given pixel | |
| 307 // position in it. When we find that guy, we ask Uniscribe for the | |
| 308 // character index. | |
| 309 HRESULT hr; | |
| 310 for (size_t screenIndex = 0; screenIndex < m_runs.size(); screenIndex++) { | |
| 311 int itemIndex = m_screenOrder[screenIndex]; | |
| 312 int itemAdvance = advanceForItem(itemIndex); | |
| 313 | |
| 314 // Note that the run may be empty if shaping failed, so we want to skip | |
| 315 // over it. | |
| 316 const Shaping& shaping = m_shapes[itemIndex]; | |
| 317 int itemLength = shaping.charLength(); | |
| 318 if (x <= itemAdvance && itemLength > 0) { | |
| 319 // The requested offset is within this item. | |
| 320 const SCRIPT_ITEM& item = m_runs[itemIndex]; | |
| 321 | |
| 322 // Account for the leading space we've added to this run that | |
| 323 // Uniscribe doesn't know about. | |
| 324 x -= shaping.m_prePadding; | |
| 325 | |
| 326 int charX = 0; | |
| 327 int trailing; | |
| 328 hr = ScriptXtoCP(x, itemLength, shaping.glyphLength(), | |
| 329 &shaping.m_logs[0], &shaping.m_visualAttributes[0], | |
| 330 shaping.effectiveAdvances(), &item.a, &charX, | |
| 331 &trailing); | |
| 332 | |
| 333 // The character offset is within the item. We need to add the | |
| 334 // item's offset to transform it into the space of the TextRun | |
| 335 return charX + item.iCharPos; | |
| 336 } | |
| 337 | |
| 338 // The offset is beyond this item, account for its length and move on. | |
| 339 x -= itemAdvance; | |
| 340 } | |
| 341 | |
| 342 // Error condition, we don't know what to do if we don't have that X | |
| 343 // position in any of our items. | |
| 344 return 0; | |
| 345 } | |
| 346 | |
| 347 void UniscribeHelper::draw(GraphicsContext* graphicsContext, | |
| 348 const FontPlatformData& fontPlatformData, HDC dc, int x, int y, | |
| 349 const FloatRect& textRect, int from, int to) | |
| 350 { | |
| 351 HGDIOBJ oldFont = 0; | |
| 352 int curX = x; | |
| 353 bool firstRun = true; | |
| 354 | |
| 355 for (size_t screenIndex = 0; screenIndex < m_runs.size(); screenIndex++) { | |
| 356 int itemIndex = m_screenOrder[screenIndex]; | |
| 357 const SCRIPT_ITEM& item = m_runs[itemIndex]; | |
| 358 const Shaping& shaping = m_shapes[itemIndex]; | |
| 359 | |
| 360 // Character offsets within this run. THESE MAY NOT BE IN RANGE and may | |
| 361 // be negative, etc. The code below handles this. | |
| 362 int fromChar = from - item.iCharPos; | |
| 363 int toChar = to - item.iCharPos; | |
| 364 | |
| 365 // See if we need to draw any characters in this item. | |
| 366 if (shaping.charLength() == 0 || | |
| 367 fromChar >= shaping.charLength() || toChar <= 0) { | |
| 368 // No chars in this item to display. | |
| 369 curX += advanceForItem(itemIndex); | |
| 370 continue; | |
| 371 } | |
| 372 | |
| 373 // Compute the starting glyph within this span. |from| and |to| are | |
| 374 // global offsets that may intersect arbitrarily with our local run. | |
| 375 int fromGlyph, afterGlyph; | |
| 376 if (item.a.fRTL) { | |
| 377 // To compute the first glyph when going RTL, we use |to|. | |
| 378 if (toChar >= shaping.charLength()) | |
| 379 // The end of the text is after (to the left) of us. | |
| 380 fromGlyph = 0; | |
| 381 else { | |
| 382 // Since |to| is exclusive, the first character we draw on the | |
| 383 // left is actually the one right before (to the right) of | |
| 384 // |to|. | |
| 385 fromGlyph = shaping.m_logs[toChar - 1]; | |
| 386 } | |
| 387 | |
| 388 // The last glyph is actually the first character in the range. | |
| 389 if (fromChar <= 0) { | |
| 390 // The first character to draw is before (to the right) of this | |
| 391 // span, so draw all the way to the end. | |
| 392 afterGlyph = shaping.glyphLength(); | |
| 393 } else { | |
| 394 // We want to draw everything up until the character to the | |
| 395 // right of |from|. To the right is - 1, so we look that up | |
| 396 // (remember our character could be more than one glyph, so we | |
| 397 // can't look up our glyph and add one). | |
| 398 afterGlyph = shaping.m_logs[fromChar - 1]; | |
| 399 } | |
| 400 } else { | |
| 401 // Easy case, everybody agrees about directions. We only need to | |
| 402 // handle boundary conditions to get a range inclusive at the | |
| 403 // beginning, and exclusive at the ending. We have to do some | |
| 404 // computation to see the glyph one past the end. | |
| 405 fromGlyph = shaping.m_logs[fromChar < 0 ? 0 : fromChar]; | |
| 406 if (toChar >= shaping.charLength()) | |
| 407 afterGlyph = shaping.glyphLength(); | |
| 408 else | |
| 409 afterGlyph = shaping.m_logs[toChar]; | |
| 410 } | |
| 411 | |
| 412 // Account for the characters that were skipped in this run. When | |
| 413 // WebKit asks us to draw a subset of the run, it actually tells us | |
| 414 // to draw at the X offset of the beginning of the run, since it | |
| 415 // doesn't know the internal position of any of our characters. | |
| 416 const int* effectiveAdvances = shaping.effectiveAdvances(); | |
| 417 int innerOffset = 0; | |
| 418 for (int i = 0; i < fromGlyph; i++) | |
| 419 innerOffset += effectiveAdvances[i]; | |
| 420 | |
| 421 // Actually draw the glyphs we found. | |
| 422 int glyphCount = afterGlyph - fromGlyph; | |
| 423 if (fromGlyph >= 0 && glyphCount > 0) { | |
| 424 // Account for the preceding space we need to add to this run. We | |
| 425 // don't need to count for the following space because that will be | |
| 426 // counted in advanceForItem below when we move to the next run. | |
| 427 innerOffset += shaping.m_prePadding; | |
| 428 | |
| 429 // Pass 0 in when there is no justification. | |
| 430 const int* justify = shaping.m_justify.size() == 0 ? 0 : &shaping.m_
justify[fromGlyph]; | |
| 431 | |
| 432 const int* advances = shaping.m_justify.size() ? | |
| 433 &shaping.m_justify[fromGlyph] | |
| 434 : &shaping.m_advance[fromGlyph]; | |
| 435 | |
| 436 // Fonts with different ascents can be used to render different | |
| 437 // runs. 'Across-runs' y-coordinate correction needs to be | |
| 438 // adjusted for each font. | |
| 439 bool textOutOk = false; | |
| 440 for (int executions = 0; executions < 2; ++executions) { | |
| 441 SkPoint origin; | |
| 442 origin.fX = curX + + innerOffset; | |
| 443 origin.fY = y + m_ascent; | |
| 444 paintSkiaText(graphicsContext, | |
| 445 fontPlatformData, | |
| 446 shaping.m_hfont, | |
| 447 glyphCount, | |
| 448 &shaping.m_glyphs[fromGlyph], | |
| 449 advances, | |
| 450 &shaping.m_offsets[fromGlyph], | |
| 451 origin, | |
| 452 textRect); | |
| 453 textOutOk = true; | |
| 454 | |
| 455 if (!textOutOk && 0 == executions) { | |
| 456 // If TextOut is called from the renderer it might fail | |
| 457 // because the sandbox is preventing it from opening the | |
| 458 // font files. If we are running in the renderer, | |
| 459 // TryToPreloadFont is overridden to ask the browser to | |
| 460 // preload the font for us so we can access it. | |
| 461 tryToPreloadFont(shaping.m_hfont); | |
| 462 continue; | |
| 463 } | |
| 464 break; | |
| 465 } | |
| 466 } | |
| 467 | |
| 468 curX += advanceForItem(itemIndex); | |
| 469 } | |
| 470 | |
| 471 if (oldFont) | |
| 472 SelectObject(dc, oldFont); | |
| 473 } | |
| 474 | |
| 475 WORD UniscribeHelper::firstGlyphForCharacter(int charOffset) const | |
| 476 { | |
| 477 // Find the run for the given character. | |
| 478 for (int i = 0; i < static_cast<int>(m_runs.size()); i++) { | |
| 479 int firstChar = m_runs[i].iCharPos; | |
| 480 const Shaping& shaping = m_shapes[i]; | |
| 481 int localOffset = charOffset - firstChar; | |
| 482 if (localOffset >= 0 && localOffset < shaping.charLength()) { | |
| 483 // The character is in this run, return the first glyph for it | |
| 484 // (should generally be the only glyph). It seems Uniscribe gives | |
| 485 // glyph 0 for empty, which is what we want to return in the | |
| 486 // "missing" case. | |
| 487 size_t glyphIndex = shaping.m_logs[localOffset]; | |
| 488 if (glyphIndex >= shaping.m_glyphs.size()) { | |
| 489 // The glyph should be in this run, but the run has too few | |
| 490 // actual characters. This can happen when shaping the run | |
| 491 // fails, in which case, we should have no data in the logs at | |
| 492 // all. | |
| 493 ASSERT(shaping.m_glyphs.size() == 0); | |
| 494 return 0; | |
| 495 } | |
| 496 return shaping.m_glyphs[glyphIndex]; | |
| 497 } | |
| 498 } | |
| 499 | |
| 500 return 0; | |
| 501 } | |
| 502 | |
| 503 void UniscribeHelper::fillRuns() | |
| 504 { | |
| 505 HRESULT hr; | |
| 506 m_runs.resize(cUniscribeHelperStackRuns); | |
| 507 m_scriptTags.resize(cUniscribeHelperStackRuns); | |
| 508 | |
| 509 SCRIPT_STATE inputState; | |
| 510 inputState.uBidiLevel = m_isRtl; | |
| 511 inputState.fOverrideDirection = m_directionalOverride; | |
| 512 inputState.fInhibitSymSwap = false; | |
| 513 inputState.fCharShape = false; // Not implemented in Uniscribe | |
| 514 inputState.fDigitSubstitute = false; // Do we want this for Arabic? | |
| 515 inputState.fInhibitLigate = m_inhibitLigate; | |
| 516 inputState.fDisplayZWG = false; // Don't draw control characters. | |
| 517 inputState.fArabicNumContext = m_isRtl; // Do we want this for Arabic? | |
| 518 inputState.fGcpClusters = false; | |
| 519 inputState.fReserved = 0; | |
| 520 inputState.fEngineReserved = 0; | |
| 521 // The psControl argument to ScriptItemize should be non-0 for RTL text, | |
| 522 // per http://msdn.microsoft.com/en-us/library/ms776532.aspx . So use a | |
| 523 // SCRIPT_CONTROL that is set to all zeros. Zero as a locale ID means the | |
| 524 // neutral locale per http://msdn.microsoft.com/en-us/library/ms776294.aspx | |
| 525 static SCRIPT_CONTROL inputControl = {0, // uDefaultLanguage :16; | |
| 526 0, // fContextDigits :1; | |
| 527 0, // fInvertPreBoundDir :1; | |
| 528 0, // fInvertPostBoundDir :1; | |
| 529 0, // fLinkStringBefore :1; | |
| 530 0, // fLinkStringAfter :1; | |
| 531 0, // fNeutralOverride :1; | |
| 532 0, // fNumericOverride :1; | |
| 533 0, // fLegacyBidiClass :1; | |
| 534 0, // fMergeNeutralItems :1; | |
| 535 0};// fReserved :7; | |
| 536 // Calling ScriptApplyDigitSubstitution( 0, &inputControl, &inputState) | |
| 537 // here would be appropriate if we wanted to set the language ID, and get | |
| 538 // local digit substitution behavior. For now, don't do it. | |
| 539 | |
| 540 while (true) { | |
| 541 int numberOfItems = 0; | |
| 542 | |
| 543 // Ideally, we would have a way to know the runs before and after this | |
| 544 // one, and put them into the control parameter of ScriptItemize. This | |
| 545 // would allow us to shape characters properly that cross style | |
| 546 // boundaries (WebKit bug 6148). | |
| 547 // | |
| 548 // We tell ScriptItemize that the output list of items is one smaller | |
| 549 // than it actually is. According to Mozilla bug 366643, if there is | |
| 550 // not enough room in the array on pre-SP2 systems, ScriptItemize will | |
| 551 // write one past the end of the buffer. | |
| 552 // | |
| 553 // ScriptItemize is very strange. It will often require a much larger | |
| 554 // ITEM buffer internally than it will give us as output. For example, | |
| 555 // it will say a 16-item buffer is not big enough, and will write | |
| 556 // interesting numbers into all those items. But when we give it a 32 | |
| 557 // item buffer and it succeeds, it only has one item output. | |
| 558 // | |
| 559 // It seems to be doing at least two passes, the first where it puts a | |
| 560 // lot of intermediate data into our items, and the second where it | |
| 561 // collates them. | |
| 562 if (gScriptItemizeOpenTypeFunc) { | |
| 563 hr = gScriptItemizeOpenTypeFunc(m_input, m_inputLength, | |
| 564 static_cast<int>(m_runs.size()) - 1, | |
| 565 &inputControl, &inputState, | |
| 566 &m_runs[0], &m_scriptTags[0], | |
| 567 &numberOfItems); | |
| 568 | |
| 569 if (SUCCEEDED(hr)) { | |
| 570 // Pack consecutive runs, the script tag of which are | |
| 571 // SCRIPT_TAG_UNKNOWN, to reduce the number of runs. | |
| 572 for (int i = 0; i < numberOfItems; ++i) { | |
| 573 // Do not pack with whitespace characters at the head. | |
| 574 // Otherwise whole the run is rendered as a whitespace. | |
| 575 WCHAR ch = m_input[m_runs[i].iCharPos]; | |
| 576 if (m_scriptTags[i] == SCRIPT_TAG_UNKNOWN && !Font::treatAsS
pace(ch) && !Font::treatAsZeroWidthSpace(ch)) { | |
| 577 int j = 1; | |
| 578 while (i + j < numberOfItems && m_scriptTags[i + j] == S
CRIPT_TAG_UNKNOWN) | |
| 579 ++j; | |
| 580 if (--j) { | |
| 581 m_runs.remove(i + 1, j); | |
| 582 m_scriptTags.remove(i + 1, j); | |
| 583 numberOfItems -= j; | |
| 584 } | |
| 585 } | |
| 586 } | |
| 587 m_scriptTags.resize(numberOfItems); | |
| 588 } | |
| 589 } else { | |
| 590 hr = ScriptItemize(m_input, m_inputLength, | |
| 591 static_cast<int>(m_runs.size()) - 1, | |
| 592 &inputControl, &inputState, &m_runs[0], | |
| 593 &numberOfItems); | |
| 594 } | |
| 595 if (SUCCEEDED(hr)) { | |
| 596 m_runs.resize(numberOfItems); | |
| 597 break; | |
| 598 } | |
| 599 if (hr != E_OUTOFMEMORY) { | |
| 600 // Some kind of unexpected error. | |
| 601 m_runs.resize(0); | |
| 602 break; | |
| 603 } | |
| 604 // There was not enough items for it to write into, expand. | |
| 605 m_runs.resize(m_runs.size() * 2); | |
| 606 m_scriptTags.resize(m_runs.size()); | |
| 607 } | |
| 608 } | |
| 609 | |
| 610 const int kUndefinedAscent = std::numeric_limits<int>::min(); | |
| 611 | |
| 612 // Given an HFONT, return the ascent. If GetTextMetrics fails, | |
| 613 // kUndefinedAscent is returned, instead. | |
| 614 int getAscent(HFONT hfont) | |
| 615 { | |
| 616 HWndDC dc(0); | |
| 617 HGDIOBJ oldFont = SelectObject(dc, hfont); | |
| 618 TEXTMETRIC tm; | |
| 619 BOOL gotMetrics = GetTextMetrics(dc, &tm); | |
| 620 SelectObject(dc, oldFont); | |
| 621 return gotMetrics ? tm.tmAscent : kUndefinedAscent; | |
| 622 } | |
| 623 | |
| 624 const WORD kUnsupportedGlyph = 0xffff; | |
| 625 | |
| 626 WORD getSpaceGlyph(HFONT hfont) | |
| 627 { | |
| 628 HWndDC dc(0); | |
| 629 HGDIOBJ oldFont = SelectObject(dc, hfont); | |
| 630 WCHAR space = L' '; | |
| 631 WORD spaceGlyph = kUnsupportedGlyph; | |
| 632 GetGlyphIndices(dc, &space, 1, &spaceGlyph, GGI_MARK_NONEXISTING_GLYPHS); | |
| 633 SelectObject(dc, oldFont); | |
| 634 return spaceGlyph; | |
| 635 } | |
| 636 | |
| 637 struct ShaperFontData { | |
| 638 ShaperFontData() | |
| 639 : hfont(0) | |
| 640 , ascent(kUndefinedAscent) | |
| 641 , scriptCache(0) | |
| 642 , spaceGlyph(0) | |
| 643 { | |
| 644 } | |
| 645 | |
| 646 HFONT hfont; | |
| 647 int ascent; | |
| 648 mutable SCRIPT_CACHE scriptCache; | |
| 649 WORD spaceGlyph; | |
| 650 }; | |
| 651 | |
| 652 // Again, using hash_map does not earn us much here. page_cycler_test intl2 | |
| 653 // gave us a 'better' result with map than with hash_map even though they're | |
| 654 // well-within 1-sigma of each other so that the difference is not significant. | |
| 655 // On the other hand, some pages in intl2 seem to take longer to load with map | |
| 656 // in the 1st pass. Need to experiment further. | |
| 657 typedef HashMap<String, ShaperFontData> ShaperFontDataCache; | |
| 658 | |
| 659 // Derive a new HFONT by replacing lfFaceName of LOGFONT with |family|, | |
| 660 // calculate the ascent for the derived HFONT, and initialize SCRIPT_CACHE | |
| 661 // in ShaperFontData. | |
| 662 // |style| is only used for cache key generation. |style| is | |
| 663 // bit-wise OR of BOLD(1), UNDERLINED(2) and ITALIC(4) and | |
| 664 // should match what's contained in LOGFONT. It should be calculated | |
| 665 // by calling GetStyleFromLogFont. | |
| 666 // Returns false if the font is not accessible, in which case |ascent| field | |
| 667 // of |ShaperFontData| is set to kUndefinedAscent. | |
| 668 // Be aware that this is not thread-safe. | |
| 669 // FIXME: Instead of having three out params, we'd better have one | |
| 670 // (|*ShaperFontData|), but somehow it mysteriously messes up the layout for | |
| 671 // certain complex script pages (e.g. hi.wikipedia.org) and also crashes | |
| 672 // at the start-up if recently visited page list includes pages with complex | |
| 673 // scripts in their title. Moreover, somehow the very first-pass of | |
| 674 // intl2 page-cycler test is noticeably slower with one out param than | |
| 675 // the current version although the subsequent 9 passes take about the | |
| 676 // same time. | |
| 677 // Be aware that this is not thread-safe. | |
| 678 static bool getDerivedFontData(const UChar* family, int style, LOGFONT* logfont, | |
| 679 int* ascent, HFONT* hfont, SCRIPT_CACHE** scriptCache, WORD* spaceGlyph) | |
| 680 { | |
| 681 ASSERT(logfont); | |
| 682 ASSERT(family); | |
| 683 ASSERT(*family); | |
| 684 | |
| 685 // It does not matter that we leak font data when we exit. | |
| 686 static ShaperFontDataCache* gFontDataCache = 0; | |
| 687 if (!gFontDataCache) | |
| 688 gFontDataCache = new ShaperFontDataCache(); | |
| 689 | |
| 690 // FIXME: This comes up pretty high in the profile so that | |
| 691 // we need to measure whether using SHA256 (after coercing all the | |
| 692 // fields to char*) is faster than String::format. | |
| 693 String fontKey = String::format("%1d:%d:%ls", style, logfont->lfHeight, fami
ly); | |
| 694 ShaperFontDataCache::iterator iter = gFontDataCache->find(fontKey); | |
| 695 ShaperFontData* derived; | |
| 696 if (iter == gFontDataCache->end()) { | |
| 697 ASSERT(wcslen(family) < LF_FACESIZE); | |
| 698 wcscpy_s(logfont->lfFaceName, LF_FACESIZE, family); | |
| 699 // FIXME: CreateFontIndirect always comes up with | |
| 700 // a font even if there's no font matching the name. Need to | |
| 701 // check it against what we actually want (as is done in | |
| 702 // FontCacheWin.cpp) | |
| 703 ShaperFontDataCache::AddResult entry = gFontDataCache->add(fontKey, Shap
erFontData()); | |
| 704 derived = &entry.iterator->value; | |
| 705 derived->hfont = CreateFontIndirect(logfont); | |
| 706 // GetAscent may return kUndefinedAscent, but we still want to | |
| 707 // cache it so that we won't have to call CreateFontIndirect once | |
| 708 // more for HFONT next time. | |
| 709 derived->ascent = getAscent(derived->hfont); | |
| 710 derived->spaceGlyph = getSpaceGlyph(derived->hfont); | |
| 711 } else { | |
| 712 derived = &iter->value; | |
| 713 // Last time, getAscent or getSpaceGlyph failed so that only HFONT was | |
| 714 // cached. Try once more assuming that TryPreloadFont | |
| 715 // was called by a caller between calls. | |
| 716 if (kUndefinedAscent == derived->ascent) | |
| 717 derived->ascent = getAscent(derived->hfont); | |
| 718 if (kUnsupportedGlyph == derived->spaceGlyph) | |
| 719 derived->spaceGlyph = getSpaceGlyph(derived->hfont); | |
| 720 } | |
| 721 *hfont = derived->hfont; | |
| 722 *ascent = derived->ascent; | |
| 723 *scriptCache = &(derived->scriptCache); | |
| 724 *spaceGlyph = derived->spaceGlyph; | |
| 725 return *ascent != kUndefinedAscent && *spaceGlyph != kUnsupportedGlyph; | |
| 726 } | |
| 727 | |
| 728 bool UniscribeHelper::shape(const UChar* input, | |
| 729 int itemLength, | |
| 730 int numGlyphs, | |
| 731 SCRIPT_ITEM& run, | |
| 732 OPENTYPE_TAG scriptTag, | |
| 733 Shaping& shaping) | |
| 734 { | |
| 735 HFONT hfont = m_hfont; | |
| 736 SCRIPT_CACHE* scriptCache = m_scriptCache; | |
| 737 SCRIPT_FONTPROPERTIES* fontProperties = m_fontProperties; | |
| 738 Vector<SCRIPT_CHARPROP, cUniscribeHelperStackChars> charProps; | |
| 739 Vector<SCRIPT_GLYPHPROP, cUniscribeHelperStackChars> glyphProps; | |
| 740 int ascent = m_ascent; | |
| 741 WORD spaceGlyph = m_spaceGlyph; | |
| 742 HRESULT hr; | |
| 743 // When used to fill up glyph pages for simple scripts in non-BMP, | |
| 744 // we don't want any font fallback in this class. The simple script | |
| 745 // font path can take care of font fallback. | |
| 746 bool lastFallbackTried = m_disableFontFallback; | |
| 747 bool result; | |
| 748 | |
| 749 int generatedGlyphs = 0; | |
| 750 | |
| 751 // In case HFONT passed in ctor cannot render this run, we have to scan | |
| 752 // other fonts from the beginning of the font list. | |
| 753 resetFontIndex(); | |
| 754 | |
| 755 // Compute shapes. | |
| 756 while (true) { | |
| 757 shaping.m_logs.resize(itemLength); | |
| 758 shaping.m_glyphs.resize(numGlyphs); | |
| 759 shaping.m_visualAttributes.resize(numGlyphs); | |
| 760 charProps.resize(itemLength); | |
| 761 glyphProps.resize(numGlyphs); | |
| 762 run.a.fNoGlyphIndex = FALSE; | |
| 763 | |
| 764 #ifdef PURIFY | |
| 765 // http://code.google.com/p/chromium/issues/detail?id=5309 | |
| 766 // Purify isn't able to track the assignments that ScriptShape makes to | |
| 767 // shaping.m_glyphs. Consequently, any bytes with value 0xCD that it | |
| 768 // writes, will be considered un-initialized data. | |
| 769 // | |
| 770 // This hack avoid the false-positive UMRs by marking the buffer as | |
| 771 // initialized. | |
| 772 // | |
| 773 // FIXME: A better solution would be to use Purify's API and mark only | |
| 774 // the populated range as initialized: | |
| 775 // | |
| 776 // PurifyMarkAsInitialized( | |
| 777 // &shaping.m_glyphs[0], | |
| 778 // sizeof(shaping.m_glyphs[0] * generatedGlyphs); | |
| 779 | |
| 780 ZeroMemory(&shaping.m_glyphs[0], | |
| 781 sizeof(shaping.m_glyphs[0]) * shaping.m_glyphs.size()); | |
| 782 #endif | |
| 783 // If our DC is already created, select the font in it so we can use it
now. | |
| 784 // Otherwise, we'll create it as needed afterward... | |
| 785 if (m_cachedDC) | |
| 786 SelectObject(m_cachedDC, hfont); | |
| 787 | |
| 788 // Firefox sets SCRIPT_ANALYSIS.SCRIPT_STATE.fDisplayZWG to true | |
| 789 // here. Is that what we want? It will display control characters. | |
| 790 if (gScriptShapeOpenTypeFunc) { | |
| 791 TEXTRANGE_PROPERTIES* rangeProps = m_featureRecords.size() ? &m_rang
eProperties : 0; | |
| 792 hr = gScriptShapeOpenTypeFunc(m_cachedDC, scriptCache, &run.a, | |
| 793 scriptTag, 0, &itemLength, | |
| 794 &rangeProps, rangeProps ? 1 : 0, | |
| 795 input, itemLength, numGlyphs, | |
| 796 &shaping.m_logs[0], &charProps[0], | |
| 797 &shaping.m_glyphs[0], &glyphProps[0], | |
| 798 &generatedGlyphs); | |
| 799 if (SUCCEEDED(hr)) { | |
| 800 // If we use ScriptShapeOpenType(), visual attributes | |
| 801 // information for each characters are stored in | |
| 802 // |glyphProps[i].sva|. | |
| 803 for (int i = 0; i < generatedGlyphs; ++i) | |
| 804 memcpy(&shaping.m_visualAttributes[i], &glyphProps[i].sva, s
izeof(SCRIPT_VISATTR)); | |
| 805 } | |
| 806 } else { | |
| 807 hr = ScriptShape(m_cachedDC, scriptCache, input, itemLength, | |
| 808 numGlyphs, &run.a, | |
| 809 &shaping.m_glyphs[0], &shaping.m_logs[0], | |
| 810 &shaping.m_visualAttributes[0], &generatedGlyphs); | |
| 811 } | |
| 812 // We receive E_PENDING when we need to try again with a Drawing Context
, | |
| 813 // but we don't want to retry again if we already tried with non-zero DC
. | |
| 814 if (hr == E_PENDING && !m_cachedDC) { | |
| 815 EnsureCachedDCCreated(); | |
| 816 continue; | |
| 817 } | |
| 818 if (hr == E_OUTOFMEMORY) { | |
| 819 numGlyphs *= 2; | |
| 820 continue; | |
| 821 } | |
| 822 if (SUCCEEDED(hr) && (lastFallbackTried || !containsMissingGlyphs(shapin
g, run, fontProperties) && canUseGlyphIndex(run))) | |
| 823 break; | |
| 824 | |
| 825 // The current font can't render this run, try next font. | |
| 826 if (!m_disableFontFallback && | |
| 827 nextWinFontData(hfont, scriptCache, fontProperties, ascent, spaceGly
ph)) { | |
| 828 // The primary font does not support this run. Try next font. | |
| 829 // In case of web page rendering, they come from fonts specified in | |
| 830 // CSS stylesheets. | |
| 831 continue; | |
| 832 } else if (!lastFallbackTried) { | |
| 833 lastFallbackTried = true; | |
| 834 | |
| 835 // Generate a last fallback font based on the script of | |
| 836 // a character to draw while inheriting size and styles | |
| 837 // from the primary font | |
| 838 if (!m_logfont.lfFaceName[0]) | |
| 839 setLogFontAndStyle(m_hfont, &m_logfont, &m_style); | |
| 840 | |
| 841 // TODO(jungshik): generic type should come from webkit for | |
| 842 // UniscribeHelperTextRun (a derived class used in webkit). | |
| 843 const UChar *family = getFallbackFamilyForFirstNonCommonCharacter(in
put, itemLength, | |
| 844 FontDescription::StandardFamily); | |
| 845 bool fontOk = getDerivedFontData(family, m_style, &m_logfont, | |
| 846 &ascent, &hfont, &scriptCache, | |
| 847 &spaceGlyph); | |
| 848 | |
| 849 | |
| 850 if (!fontOk) { | |
| 851 // If this GetDerivedFontData is called from the renderer it | |
| 852 // might fail because the sandbox is preventing it from opening | |
| 853 // the font files. If we are running in the renderer, | |
| 854 // TryToPreloadFont is overridden to ask the browser to preload | |
| 855 // the font for us so we can access it. | |
| 856 tryToPreloadFont(hfont); | |
| 857 | |
| 858 // Try again. | |
| 859 fontOk = getDerivedFontData(family, m_style, &m_logfont, | |
| 860 &ascent, &hfont, &scriptCache, | |
| 861 &spaceGlyph); | |
| 862 ASSERT(fontOk); | |
| 863 } | |
| 864 | |
| 865 // TODO(jungshik) : Currently GetDerivedHFont always returns a | |
| 866 // a valid HFONT, but in the future, I may change it to return 0. | |
| 867 ASSERT(hfont); | |
| 868 | |
| 869 // We don't need a font_properties for the last resort fallback font | |
| 870 // because we don't have anything more to try and are forced to | |
| 871 // accept empty glyph boxes. If we tried a series of fonts as | |
| 872 // 'last-resort fallback', we'd need it, but currently, we don't. | |
| 873 continue; | |
| 874 } else if (hr == USP_E_SCRIPT_NOT_IN_FONT) { | |
| 875 run.a.eScript = SCRIPT_UNDEFINED; | |
| 876 continue; | |
| 877 } else if (FAILED(hr)) { | |
| 878 // Error shaping. | |
| 879 generatedGlyphs = 0; | |
| 880 result = false; | |
| 881 goto cleanup; | |
| 882 } | |
| 883 } | |
| 884 | |
| 885 // Sets Windows font data for this run to those corresponding to | |
| 886 // a font supporting this run. we don't need to store font_properties | |
| 887 // because it's not used elsewhere. | |
| 888 shaping.m_hfont = hfont; | |
| 889 shaping.m_scriptCache = scriptCache; | |
| 890 shaping.m_spaceGlyph = spaceGlyph; | |
| 891 | |
| 892 // The ascent of a font for this run can be different from | |
| 893 // that of the primary font so that we need to keep track of | |
| 894 // the difference per run and take that into account when calling | |
| 895 // ScriptTextOut in |draw|. Otherwise, different runs rendered by | |
| 896 // different fonts would not be aligned vertically. | |
| 897 shaping.m_ascentOffset = m_ascent ? ascent - m_ascent : 0; | |
| 898 result = true; | |
| 899 | |
| 900 cleanup: | |
| 901 shaping.m_glyphs.resize(generatedGlyphs); | |
| 902 shaping.m_visualAttributes.resize(generatedGlyphs); | |
| 903 shaping.m_advance.resize(generatedGlyphs); | |
| 904 shaping.m_offsets.resize(generatedGlyphs); | |
| 905 | |
| 906 // On failure, our logs don't mean anything, so zero those out. | |
| 907 if (!result) | |
| 908 shaping.m_logs.clear(); | |
| 909 | |
| 910 return result; | |
| 911 } | |
| 912 | |
| 913 void UniscribeHelper::EnsureCachedDCCreated() | |
| 914 { | |
| 915 if (m_cachedDC) | |
| 916 return; | |
| 917 // Allocate a memory DC that is compatible with the Desktop DC since we don'
t have any window, | |
| 918 // and we don't want to use the Desktop DC directly since it can have nasty
side effects | |
| 919 // as identified in Chrome Issue http://crbug.com/59315. | |
| 920 HWndDC screenDC(0); | |
| 921 m_cachedDC = ::CreateCompatibleDC(screenDC); | |
| 922 ASSERT(m_cachedDC); | |
| 923 } | |
| 924 | |
| 925 void UniscribeHelper::fillShapes() | |
| 926 { | |
| 927 m_shapes.resize(m_runs.size()); | |
| 928 for (size_t i = 0; i < m_runs.size(); i++) { | |
| 929 int startItem = m_runs[i].iCharPos; | |
| 930 int itemLength = m_inputLength - startItem; | |
| 931 if (i < m_runs.size() - 1) | |
| 932 itemLength = m_runs[i + 1].iCharPos - startItem; | |
| 933 | |
| 934 int numGlyphs; | |
| 935 if (itemLength < cUniscribeHelperStackChars) { | |
| 936 // We'll start our buffer sizes with the current stack space | |
| 937 // available in our buffers if the current input fits. As long as | |
| 938 // it doesn't expand past that we'll save a lot of time mallocing. | |
| 939 numGlyphs = cUniscribeHelperStackChars; | |
| 940 } else { | |
| 941 // When the input doesn't fit, give up with the stack since it will | |
| 942 // almost surely not be enough room (unless the input actually | |
| 943 // shrinks, which is unlikely) and just start with the length | |
| 944 // recommended by the Uniscribe documentation as a "usually fits" | |
| 945 // size. | |
| 946 numGlyphs = itemLength * 3 / 2 + 16; | |
| 947 } | |
| 948 | |
| 949 // Convert a string to a glyph string trying the primary font, fonts in | |
| 950 // the fallback list and then script-specific last resort font. | |
| 951 Shaping& shaping = m_shapes[i]; | |
| 952 if (!shape(&m_input[startItem], itemLength, numGlyphs, m_runs[i], m_scri
ptTags[i], shaping)) | |
| 953 continue; | |
| 954 | |
| 955 // At the moment, the only time m_disableFontFallback is set is | |
| 956 // when we look up glyph indices for non-BMP code ranges. So, | |
| 957 // we can skip the glyph placement. When that becomes not the case | |
| 958 // any more, we have to add a new flag to control glyph placement. | |
| 959 if (m_disableFontFallback) | |
| 960 continue; | |
| 961 | |
| 962 // Compute placements. Note that offsets is documented incorrectly | |
| 963 // and is actually an array. | |
| 964 EnsureCachedDCCreated(); | |
| 965 SelectObject(m_cachedDC, shaping.m_hfont); | |
| 966 shaping.m_prePadding = 0; | |
| 967 if (FAILED(ScriptPlace(m_cachedDC, shaping.m_scriptCache, | |
| 968 &shaping.m_glyphs[0], | |
| 969 static_cast<int>(shaping.m_glyphs.size()), | |
| 970 &shaping.m_visualAttributes[0], &m_runs[i].a, | |
| 971 &shaping.m_advance[0], &shaping.m_offsets[0], | |
| 972 &shaping.m_abc))) { | |
| 973 // Some error we don't know how to handle. Nuke all of our data | |
| 974 // since we can't deal with partially valid data later. | |
| 975 m_runs.clear(); | |
| 976 m_scriptTags.clear(); | |
| 977 m_shapes.clear(); | |
| 978 m_screenOrder.clear(); | |
| 979 } | |
| 980 } | |
| 981 | |
| 982 adjustSpaceAdvances(); | |
| 983 | |
| 984 if (m_letterSpacing != 0 || m_wordSpacing != 0) | |
| 985 applySpacing(); | |
| 986 } | |
| 987 | |
| 988 void UniscribeHelper::fillScreenOrder() | |
| 989 { | |
| 990 m_screenOrder.resize(m_runs.size()); | |
| 991 | |
| 992 // We assume that the input has only one text direction in it. | |
| 993 // TODO(brettw) are we sure we want to keep this restriction? | |
| 994 if (m_isRtl) { | |
| 995 for (int i = 0; i < static_cast<int>(m_screenOrder.size()); i++) | |
| 996 m_screenOrder[static_cast<int>(m_screenOrder.size()) - i - 1] = i; | |
| 997 } else { | |
| 998 for (int i = 0; i < static_cast<int>(m_screenOrder.size()); i++) | |
| 999 m_screenOrder[i] = i; | |
| 1000 } | |
| 1001 } | |
| 1002 | |
| 1003 void UniscribeHelper::adjustSpaceAdvances() | |
| 1004 { | |
| 1005 if (m_spaceWidth == 0) | |
| 1006 return; | |
| 1007 | |
| 1008 int spaceWidthWithoutLetterSpacing = m_spaceWidth - m_letterSpacing; | |
| 1009 | |
| 1010 // This mostly matches what WebKit's UniscribeController::shapeAndPlaceItem. | |
| 1011 for (size_t run = 0; run < m_runs.size(); run++) { | |
| 1012 Shaping& shaping = m_shapes[run]; | |
| 1013 | |
| 1014 // FIXME: This loop is not UTF-16-safe. Unicode 6.0 has a couple | |
| 1015 // of complex script blocks in Plane 1. | |
| 1016 for (int i = 0; i < shaping.charLength(); i++) { | |
| 1017 UChar c = m_input[m_runs[run].iCharPos + i]; | |
| 1018 bool treatAsSpace = Font::treatAsSpace(c); | |
| 1019 if (!treatAsSpace && !Font::treatAsZeroWidthSpaceInComplexScript(c)) | |
| 1020 continue; | |
| 1021 | |
| 1022 int glyphIndex = shaping.m_logs[i]; | |
| 1023 int currentAdvance = shaping.m_advance[glyphIndex]; | |
| 1024 | |
| 1025 shaping.m_glyphs[glyphIndex] = shaping.m_spaceGlyph; | |
| 1026 | |
| 1027 if (treatAsSpace) { | |
| 1028 // currentAdvance does not include additional letter-spacing, | |
| 1029 // but m_spaceWidth does. Here we find out how off we are from | |
| 1030 // the correct width (spaceWidthWithoutLetterSpacing) and | |
| 1031 // just subtract that diff. | |
| 1032 int diff = currentAdvance - spaceWidthWithoutLetterSpacing; | |
| 1033 // The shaping can consist of a run of text, so only subtract | |
| 1034 // the difference in the width of the glyph. | |
| 1035 shaping.m_advance[glyphIndex] -= diff; | |
| 1036 shaping.m_abc.abcB -= diff; | |
| 1037 continue; | |
| 1038 } | |
| 1039 | |
| 1040 // For characters treated as zero-width space in complex | |
| 1041 // scripts, set the advance width to zero, adjust | |
| 1042 // |abcB| of the current run accordingly and set | |
| 1043 // the glyph to m_spaceGlyph (invisible). | |
| 1044 shaping.m_advance[glyphIndex] = 0; | |
| 1045 shaping.m_abc.abcB -= currentAdvance; | |
| 1046 shaping.m_offsets[glyphIndex].du = 0; | |
| 1047 shaping.m_offsets[glyphIndex].dv = 0; | |
| 1048 } | |
| 1049 } | |
| 1050 } | |
| 1051 | |
| 1052 void UniscribeHelper::applySpacing() | |
| 1053 { | |
| 1054 for (size_t run = 0; run < m_runs.size(); run++) { | |
| 1055 Shaping& shaping = m_shapes[run]; | |
| 1056 bool isRtl = m_runs[run].a.fRTL; | |
| 1057 | |
| 1058 if (m_letterSpacing != 0) { | |
| 1059 // RTL text gets padded to the left of each character. We increment | |
| 1060 // the run's advance to make this happen. This will be balanced out | |
| 1061 // by NOT adding additional advance to the last glyph in the run. | |
| 1062 if (isRtl) | |
| 1063 shaping.m_prePadding += m_letterSpacing; | |
| 1064 | |
| 1065 // Go through all the glyphs in this run and increase the "advance" | |
| 1066 // to account for letter spacing. We adjust letter spacing only on | |
| 1067 // cluster boundaries. | |
| 1068 // | |
| 1069 // This works for most scripts, but may have problems with some | |
| 1070 // indic scripts. This behavior is better than Firefox or IE for | |
| 1071 // Hebrew. | |
| 1072 for (int i = 0; i < shaping.glyphLength(); i++) { | |
| 1073 if (shaping.m_visualAttributes[i].fClusterStart) { | |
| 1074 // Ick, we need to assign the extra space so that the glyph | |
| 1075 // comes first, then is followed by the space. This is | |
| 1076 // opposite for RTL. | |
| 1077 if (isRtl) { | |
| 1078 if (i != shaping.glyphLength() - 1) { | |
| 1079 // All but the last character just get the spacing | |
| 1080 // applied to their advance. The last character | |
| 1081 // doesn't get anything, | |
| 1082 shaping.m_advance[i] += m_letterSpacing; | |
| 1083 shaping.m_abc.abcB += m_letterSpacing; | |
| 1084 } | |
| 1085 } else { | |
| 1086 // LTR case is easier, we just add to the advance. | |
| 1087 shaping.m_advance[i] += m_letterSpacing; | |
| 1088 shaping.m_abc.abcB += m_letterSpacing; | |
| 1089 } | |
| 1090 } | |
| 1091 } | |
| 1092 } | |
| 1093 | |
| 1094 // Go through all the characters to find whitespace and insert the | |
| 1095 // extra wordspacing amount for the glyphs they correspond to. | |
| 1096 if (m_wordSpacing != 0) { | |
| 1097 for (int i = 0; i < shaping.charLength(); i++) { | |
| 1098 if (!Font::treatAsSpace(m_input[m_runs[run].iCharPos + i])) | |
| 1099 continue; | |
| 1100 | |
| 1101 // The char in question is a word separator... | |
| 1102 int glyphIndex = shaping.m_logs[i]; | |
| 1103 | |
| 1104 // Spaces will not have a glyph in Uniscribe, it will just add | |
| 1105 // additional advance to the character to the left of the | |
| 1106 // space. The space's corresponding glyph will be the character | |
| 1107 // following it in reading order. | |
| 1108 if (isRtl) { | |
| 1109 // In RTL, the glyph to the left of the space is the same | |
| 1110 // as the first glyph of the following character, so we can | |
| 1111 // just increment it. | |
| 1112 shaping.m_advance[glyphIndex] += m_wordSpacing; | |
| 1113 shaping.m_abc.abcB += m_wordSpacing; | |
| 1114 } else { | |
| 1115 // LTR is actually more complex here, we apply it to the | |
| 1116 // previous character if there is one, otherwise we have to | |
| 1117 // apply it to the leading space of the run. | |
| 1118 if (glyphIndex == 0) | |
| 1119 shaping.m_prePadding += m_wordSpacing; | |
| 1120 else { | |
| 1121 shaping.m_advance[glyphIndex - 1] += m_wordSpacing; | |
| 1122 shaping.m_abc.abcB += m_wordSpacing; | |
| 1123 } | |
| 1124 } | |
| 1125 } | |
| 1126 } // m_wordSpacing != 0 | |
| 1127 | |
| 1128 // Loop for next run... | |
| 1129 } | |
| 1130 } | |
| 1131 | |
| 1132 // The advance is the ABC width of the run | |
| 1133 int UniscribeHelper::advanceForItem(int itemIndex) const | |
| 1134 { | |
| 1135 int accum = 0; | |
| 1136 const Shaping& shaping = m_shapes[itemIndex]; | |
| 1137 | |
| 1138 if (shaping.m_justify.size() == 0) { | |
| 1139 // Easy case with no justification, the width is just the ABC width of | |
| 1140 // the run. (The ABC width is the sum of the advances). | |
| 1141 return shaping.m_abc.abcA + shaping.m_abc.abcB + | |
| 1142 shaping.m_abc.abcC + shaping.m_prePadding; | |
| 1143 } | |
| 1144 | |
| 1145 // With justification, we use the justified amounts instead. The | |
| 1146 // justification array contains both the advance and the extra space | |
| 1147 // added for justification, so is the width we want. | |
| 1148 int justification = 0; | |
| 1149 for (size_t i = 0; i < shaping.m_justify.size(); i++) | |
| 1150 justification += shaping.m_justify[i]; | |
| 1151 | |
| 1152 return shaping.m_prePadding + justification; | |
| 1153 } | |
| 1154 | |
| 1155 // SCRIPT_FONTPROPERTIES contains glyph indices for default, invalid | |
| 1156 // and blank glyphs. Just because ScriptShape succeeds does not mean | |
| 1157 // that a text run is rendered correctly. Some characters may be rendered | |
| 1158 // with default/invalid/blank glyphs. Therefore, we need to check if the glyph | |
| 1159 // array returned by ScriptShape contains any of those glyphs to make | |
| 1160 // sure that the text run is rendered successfully. | |
| 1161 // However, we should not subject zero-width characters to this test. | |
| 1162 | |
| 1163 bool UniscribeHelper::containsMissingGlyphs(const Shaping& shaping, | |
| 1164 const SCRIPT_ITEM& run, | |
| 1165 const SCRIPT_FONTPROPERTIES* propert
ies) const | |
| 1166 { | |
| 1167 for (int i = 0; i < shaping.charLength(); i++) { | |
| 1168 UChar c = m_input[run.iCharPos + i]; | |
| 1169 // Skip zero-width space characters because they're not considered to | |
| 1170 // be missing in a font. | |
| 1171 if (Font::treatAsZeroWidthSpaceInComplexScript(c)) | |
| 1172 continue; | |
| 1173 int glyphIndex = shaping.m_logs[i]; | |
| 1174 WORD glyph = shaping.m_glyphs[glyphIndex]; | |
| 1175 // Note on the thrid condition: Windows Vista sometimes returns glyphs | |
| 1176 // equal to wgBlank (instead of wgDefault), with fZeroWidth set. Treat | |
| 1177 // such cases as having missing glyphs if the corresponding character | |
| 1178 // is not a zero width whitespace. | |
| 1179 if (glyph == properties->wgDefault | |
| 1180 || (glyph == properties->wgInvalid && glyph != properties->wgBlank) | |
| 1181 || (glyph == properties->wgBlank && shaping.m_visualAttributes[glyph
Index].fZeroWidth && !Font::treatAsZeroWidthSpace(c))) | |
| 1182 return true; | |
| 1183 } | |
| 1184 return false; | |
| 1185 } | |
| 1186 | |
| 1187 static OPENTYPE_TAG convertFeatureTag(const String& tag) | |
| 1188 { | |
| 1189 return ((tag[0] & 0xFF) | ((tag[1] & 0xFF) << 8) | ((tag[2] & 0xFF) << 16) |
((tag[3] & 0xFF) << 24)); | |
| 1190 } | |
| 1191 | |
| 1192 void UniscribeHelper::setRangeProperties(const FontFeatureSettings* featureSetti
ngs) | |
| 1193 { | |
| 1194 if (!featureSettings || !featureSettings->size()) { | |
| 1195 m_featureRecords.resize(0); | |
| 1196 return; | |
| 1197 } | |
| 1198 | |
| 1199 m_featureRecords.resize(featureSettings->size()); | |
| 1200 for (unsigned i = 0; i < featureSettings->size(); ++i) { | |
| 1201 m_featureRecords[i].lParameter = featureSettings->at(i).value(); | |
| 1202 m_featureRecords[i].tagFeature = convertFeatureTag(featureSettings->at(i
).tag()); | |
| 1203 } | |
| 1204 m_rangeProperties.potfRecords = &m_featureRecords[0]; | |
| 1205 m_rangeProperties.cotfRecords = m_featureRecords.size(); | |
| 1206 } | |
| 1207 | |
| 1208 } // namespace WebCore | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk