reed@android.com | 0680d6c | 2008-12-19 19:46:15 +0000 | [diff] [blame^] | 1 | /* |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2 | ** Copyright 2006, The Android Open Source Project |
reed@android.com | 0680d6c | 2008-12-19 19:46:15 +0000 | [diff] [blame^] | 3 | ** |
| 4 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | ** you may not use this file except in compliance with the License. |
| 6 | ** You may obtain a copy of the License at |
| 7 | ** |
| 8 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | ** |
| 10 | ** Unless required by applicable law or agreed to in writing, software |
| 11 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | ** See the License for the specific language governing permissions and |
| 14 | ** limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "SkFontHost.h" |
| 18 | #include "SkDescriptor.h" |
| 19 | |
| 20 | // Give 1MB font cache budget |
| 21 | #define FONT_CACHE_MEMORY_BUDGET (1024 * 1024) |
| 22 | |
| 23 | const char* gDefaultfont = "Arial"; // hard code for now |
| 24 | static SkMutex gFTMutex; |
| 25 | |
| 26 | inline SkPoint F32PtToSkPoint(const Float32Point p) |
| 27 | { |
| 28 | SkPoint sp = { SkFloatToFixed(p.x),SkFloatToFixed(p.y) }; |
| 29 | return sp; |
| 30 | } |
| 31 | |
| 32 | static inline uint32_t _rotl(uint32_t v, uint32_t r) |
| 33 | { |
| 34 | return (v << r | v >> (32 - r)); |
| 35 | } |
| 36 | |
| 37 | // This will generate a unique ID based on the fontname + fontstyle |
| 38 | // and also used by upper layer |
| 39 | uint32_t FontFaceChecksum(const char *name,SkTypeface::Style style) |
| 40 | { |
| 41 | if (!name) return style; |
| 42 | |
| 43 | char* q = (char*)name; |
| 44 | |
| 45 | // From "Performance in Practice of String Hashing Functions" |
| 46 | // Ramakrishna & Zobel |
| 47 | const uint32_t L = 5; |
| 48 | const uint32_t R = 2; |
| 49 | |
| 50 | uint32_t h = 0x12345678; |
| 51 | while (*q) { |
| 52 | uint32_t ql = tolower(*q); |
| 53 | h ^= ((h << L) + (h >> R) + ql); |
| 54 | q ++; |
| 55 | } |
| 56 | |
| 57 | // add style |
| 58 | h = _rotl(h, 3) ^ style; |
| 59 | |
| 60 | return h; |
| 61 | } |
| 62 | |
| 63 | #pragma mark - |
| 64 | struct SkFaceRec { |
| 65 | SkFaceRec* fNext; |
| 66 | uint32_t fRefCnt; |
| 67 | ATSUFontID fFontID; |
| 68 | ATSUStyle fStyle; |
| 69 | |
| 70 | SkFaceRec() : fFontID(0), fRefCnt(0), fStyle(NULL) {}; |
| 71 | |
| 72 | ~SkFaceRec() { |
| 73 | if (fStyle) { |
| 74 | ::ATSUDisposeStyle(fStyle); |
| 75 | fStyle = NULL; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | uint32_t ref() { |
| 80 | return ++fRefCnt; |
| 81 | } |
| 82 | }; |
| 83 | |
| 84 | // Font Face list |
| 85 | static SkFaceRec* gFaceRecHead = NULL; |
| 86 | |
| 87 | static SkFaceRec* find_ft_face(const ATSUFontID fontID) { |
| 88 | SkFaceRec* rec = gFaceRecHead; |
| 89 | while (rec) { |
| 90 | if (rec->fFontID == fontID) { |
| 91 | return rec; |
| 92 | } |
| 93 | rec = rec->fNext; |
| 94 | } |
| 95 | |
| 96 | return NULL; |
| 97 | } |
| 98 | |
| 99 | static SkFaceRec* insert_ft_face(const ATSUFontID afontID, const ATSUStyle atsuStyle) { |
| 100 | SkFaceRec* rec = find_ft_face(afontID); |
| 101 | if (rec) { |
| 102 | return rec; // found? |
| 103 | } |
| 104 | |
| 105 | rec = SkNEW(SkFaceRec); |
| 106 | rec->fFontID = afontID; |
| 107 | rec->fStyle = atsuStyle; |
| 108 | rec->fNext = gFaceRecHead; |
| 109 | gFaceRecHead = rec; |
| 110 | |
| 111 | return rec; |
| 112 | } |
| 113 | |
| 114 | static void unref_ft_face(const ATSUFontID fontID) { |
| 115 | |
| 116 | SkFaceRec* rec = gFaceRecHead; |
| 117 | SkFaceRec* prev = NULL; |
| 118 | while (rec) { |
| 119 | SkFaceRec* next = rec->fNext; |
| 120 | if (rec->fFontID == fontID) { |
| 121 | if (--rec->fRefCnt == 0) { |
| 122 | if (prev) |
| 123 | prev->fNext = next; |
| 124 | else |
| 125 | gFaceRecHead = next; |
| 126 | |
| 127 | SkDELETE(rec); |
| 128 | } |
| 129 | return; |
| 130 | } |
| 131 | prev = rec; |
| 132 | rec = next; |
| 133 | } |
| 134 | SkASSERT("shouldn't get here, face not in list"); |
| 135 | } |
| 136 | |
| 137 | #pragma mark - |
| 138 | |
| 139 | // have to do this because SkTypeface::SkTypeface() is protected |
| 140 | class SkTypeface_Mac : public SkTypeface { |
| 141 | public: |
| 142 | SkTypeface_Mac(SkTypeface::Style style, uint32_t id) : SkTypeface(style, id) {} |
| 143 | |
| 144 | ~SkTypeface_Mac() {} |
| 145 | }; |
| 146 | |
| 147 | #pragma mark - |
| 148 | |
| 149 | static SkTypeface* CreateTypeface_(const char *name, const SkTypeface::Style style) { |
| 150 | |
| 151 | OSStatus err; |
| 152 | ATSUStyle atsuStyle; |
| 153 | ::ATSUCreateStyle(&atsuStyle); |
| 154 | if (name != NULL) { |
| 155 | static const ATSUAttributeTag fontTag = kATSUFontTag; |
| 156 | static const ByteCount fontTagSize = sizeof(ATSUFontID); |
| 157 | |
| 158 | ATSUFontID fontID = 0; |
| 159 | #if 1 |
| 160 | err = ::ATSUFindFontFromName( |
| 161 | name,strlen(name),kFontNoNameCode, /* instead of regular, kFontFamilyName returns bold and/or italic sometimes, but why this works?? */ |
| 162 | kFontMacintoshPlatform,kFontNoScriptCode,kFontNoLanguageCode,&fontID); |
| 163 | #else |
| 164 | CFStringRef cfontName = CFStringCreateWithCString(NULL, name, kCFStringEncodingASCII); |
| 165 | ATSFontRef fontRef = ::ATSFontFindFromName(cfontName,kATSOptionFlagsDefault); |
| 166 | fontID = ::FMGetFontFromATSFontRef(fontRef); |
| 167 | CFRelease(cfontName); |
| 168 | #endif |
| 169 | if (0 != fontID) { |
| 170 | const ATSUAttributeValuePtr values[] = { &fontID }; |
| 171 | err = ::ATSUSetAttributes(atsuStyle,1,&fontTag,&fontTagSize,values); |
| 172 | } |
| 173 | else { |
| 174 | } |
| 175 | } |
| 176 | if (style != SkTypeface::kNormal) { |
| 177 | Boolean fontItalic = ((style & SkTypeface::kItalic) != 0); |
| 178 | Boolean fontBold = ((style & SkTypeface::kBold) != 0); |
| 179 | const ATSUAttributeTag tags[2] = { kATSUQDBoldfaceTag, kATSUQDItalicTag }; |
| 180 | const ATSUAttributeValuePtr values[2] = { &fontBold, &fontItalic }; |
| 181 | const ByteCount sizes[2] = { sizeof(Boolean), sizeof(Boolean) }; |
| 182 | err = ::ATSUSetAttributes(atsuStyle,2,tags,sizes,values); |
| 183 | } |
| 184 | |
| 185 | uint32_t cs = FontFaceChecksum(name,style); |
| 186 | SkTypeface_Mac* ptypeface = new SkTypeface_Mac(style,cs); |
| 187 | |
| 188 | if (NULL == ptypeface) { |
| 189 | SkASSERT(false); |
| 190 | return NULL; |
| 191 | } |
| 192 | |
| 193 | SkFaceRec* rec = insert_ft_face(cs, atsuStyle); |
| 194 | SkASSERT(rec); |
| 195 | |
| 196 | return ptypeface; |
| 197 | } |
| 198 | |
| 199 | static SkTypeface* CreateTypeface_(const SkFaceRec* rec, const SkTypeface::Style style) { |
| 200 | |
| 201 | OSStatus err; |
| 202 | ATSUStyle atsuStyle; |
| 203 | err = ::ATSUCreateAndCopyStyle(rec->fStyle, &atsuStyle); |
| 204 | |
| 205 | Boolean fontItalic = ((style & SkTypeface::kItalic) != 0); |
| 206 | Boolean fontBold = ((style & SkTypeface::kBold) != 0); |
| 207 | const ATSUAttributeTag tags[2] = { kATSUQDBoldfaceTag, kATSUQDItalicTag }; |
| 208 | const ATSUAttributeValuePtr values[2] = { &fontBold, &fontItalic }; |
| 209 | const ByteCount sizes[2] = { sizeof(Boolean), sizeof(Boolean) }; |
| 210 | err = ::ATSUSetAttributes(atsuStyle,2,tags,sizes,values); |
| 211 | |
| 212 | // get old font id and name |
| 213 | ATSUFontID fontID = 0; |
| 214 | ByteCount actual = 0; |
| 215 | err = ::ATSUGetAttribute(rec->fStyle,kATSUFontTag,sizeof(ATSUFontID),&fontID,&actual); |
| 216 | |
| 217 | ByteCount actualLength = 0; |
| 218 | char *fontname = NULL; |
| 219 | err = ::ATSUFindFontName(fontID , kFontFamilyName, kFontUnicodePlatform, kFontNoScriptCode, |
| 220 | kFontNoLanguageCode , 0 , NULL , &actualLength , NULL ); |
| 221 | if ( err == noErr) |
| 222 | { |
| 223 | actualLength += 1 ; |
| 224 | fontname = (char*)malloc( actualLength ); |
| 225 | err = ::ATSUFindFontName(fontID, kFontFamilyName, kFontUnicodePlatform, kFontNoScriptCode, |
| 226 | kFontNoLanguageCode, actualLength, fontname , NULL, NULL); |
| 227 | } |
| 228 | |
| 229 | SkTypeface_Mac* ptypeface = NULL; |
| 230 | if (fontname == NULL) { |
| 231 | ptypeface = new SkTypeface_Mac(style,rec->fFontID); |
| 232 | return ptypeface; |
| 233 | } |
| 234 | else { |
| 235 | uint32_t cs = FontFaceChecksum(fontname,style); |
| 236 | ptypeface = new SkTypeface_Mac(style, cs); |
| 237 | |
| 238 | if (NULL == ptypeface) { |
| 239 | SkASSERT(false); |
| 240 | return NULL; |
| 241 | } |
| 242 | |
| 243 | free(fontname); |
| 244 | |
| 245 | insert_ft_face(cs,atsuStyle); |
| 246 | } |
| 247 | return ptypeface; |
| 248 | } |
| 249 | |
| 250 | #pragma mark - |
| 251 | |
| 252 | class SkScalerContext_Mac : public SkScalerContext { |
| 253 | public: |
| 254 | SkScalerContext_Mac(const SkDescriptor* desc); |
| 255 | virtual ~SkScalerContext_Mac(); |
| 256 | |
| 257 | protected: |
| 258 | virtual unsigned generateGlyphCount() const; |
| 259 | virtual uint16_t generateCharToGlyph(SkUnichar uni); |
| 260 | virtual void generateAdvance(SkGlyph* glyph); |
| 261 | virtual void generateMetrics(SkGlyph* glyph); |
| 262 | virtual void generateImage(const SkGlyph& glyph); |
| 263 | virtual void generatePath(const SkGlyph& glyph, SkPath* path); |
| 264 | virtual void generateLineHeight(SkPoint* ascent, SkPoint* descent); |
| 265 | virtual void generateFontMetrics(SkPaint::FontMetrics* mX, SkPaint::FontMetrics* mY); |
| 266 | // virtual SkDeviceContext getDC() { return NULL; } // not implemented on Mac |
| 267 | |
| 268 | private: |
| 269 | ATSUTextLayout fLayout; |
| 270 | ATSUStyle fStyle; |
| 271 | |
| 272 | static OSStatus MoveTo(const Float32Point *pt, void *cb); |
| 273 | static OSStatus Line(const Float32Point *pt, void *cb); |
| 274 | static OSStatus Curve(const Float32Point *pt1, const Float32Point *pt2, const Float32Point *pt3, void *cb); |
| 275 | static OSStatus Close(void *cb); |
| 276 | }; |
| 277 | |
| 278 | SkScalerContext_Mac::SkScalerContext_Mac(const SkDescriptor* desc) |
| 279 | : SkScalerContext(desc), fLayout(0), fStyle(0) |
| 280 | { |
| 281 | SkAutoMutexAcquire ac(gFTMutex); |
| 282 | OSStatus err; |
| 283 | |
| 284 | SkFaceRec* rec = find_ft_face(fRec.fFontID); |
| 285 | if (rec) { |
| 286 | rec->ref(); |
| 287 | err = ::ATSUCreateAndCopyStyle(rec->fStyle, &fStyle); |
| 288 | } |
| 289 | else { |
| 290 | SkASSERT(false); |
| 291 | // create a default |
| 292 | err = ::ATSUCreateStyle(&fStyle); |
| 293 | } |
| 294 | |
| 295 | uint32_t size = SkScalarFloor(fRec.fTextSize); |
| 296 | Fixed fixedSize = IntToFixed(size); |
| 297 | static const ATSUAttributeTag sizeTag = kATSUSizeTag; |
| 298 | static const ByteCount sizeTagSize = sizeof(Fixed); |
| 299 | const ATSUAttributeValuePtr values[] = { &fixedSize }; |
| 300 | err = ::ATSUSetAttributes(fStyle,1,&sizeTag,&sizeTagSize,values); |
| 301 | |
| 302 | err = ::ATSUCreateTextLayout(&fLayout); |
| 303 | } |
| 304 | |
| 305 | SkScalerContext_Mac::~SkScalerContext_Mac() |
| 306 | { |
| 307 | unref_ft_face(fRec.fFontID); |
| 308 | |
| 309 | ::ATSUDisposeTextLayout(fLayout); |
| 310 | ::ATSUDisposeStyle(fStyle); |
| 311 | } |
| 312 | |
| 313 | unsigned SkScalerContext_Mac::generateGlyphCount() const |
| 314 | { |
| 315 | return 0xFFFF; |
| 316 | } |
| 317 | |
| 318 | uint16_t SkScalerContext_Mac::generateCharToGlyph(SkUnichar uni) |
| 319 | { |
| 320 | SkAutoMutexAcquire ac(gFTMutex); |
| 321 | |
| 322 | OSStatus err; |
| 323 | UniChar achar = uni; |
| 324 | err = ::ATSUSetTextPointerLocation(fLayout,&achar,0,1,1); |
| 325 | err = ::ATSUSetRunStyle(fLayout,fStyle,kATSUFromTextBeginning,kATSUToTextEnd); |
| 326 | |
| 327 | ATSLayoutRecord *layoutPtr; |
| 328 | ItemCount count; |
| 329 | ATSGlyphRef glyph; |
| 330 | |
| 331 | err = ::ATSUDirectGetLayoutDataArrayPtrFromTextLayout(fLayout,0,kATSUDirectDataLayoutRecordATSLayoutRecordCurrent,(void**)&layoutPtr,&count); |
| 332 | glyph = layoutPtr->glyphID; |
| 333 | ::ATSUDirectReleaseLayoutDataArrayPtr(NULL,kATSUDirectDataLayoutRecordATSLayoutRecordCurrent,(void**)&layoutPtr); |
| 334 | return glyph; |
| 335 | } |
| 336 | |
| 337 | void SkScalerContext_Mac::generateAdvance(SkGlyph* glyph) { |
| 338 | this->generateMetrics(glyph); |
| 339 | } |
| 340 | |
| 341 | void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph) |
| 342 | { |
| 343 | GlyphID glyphID = glyph->fID; |
| 344 | ATSGlyphScreenMetrics metrics= { 0 }; |
| 345 | |
| 346 | glyph->fRsbDelta = 0; |
| 347 | glyph->fLsbDelta = 0; |
| 348 | |
| 349 | OSStatus err = ATSUGlyphGetScreenMetrics(fStyle,1,&glyphID,0,true,true,&metrics); |
| 350 | if (err == noErr) { |
| 351 | glyph->fAdvanceX = SkFloatToFixed(metrics.deviceAdvance.x); |
| 352 | glyph->fAdvanceY = SkFloatToFixed(metrics.deviceAdvance.y); |
| 353 | //glyph->fWidth = metrics.width; |
| 354 | //glyph->fHeight = metrics.height; |
| 355 | glyph->fWidth = metrics.width + ceil(metrics.sideBearing.x - metrics.otherSideBearing.x); |
| 356 | glyph->fHeight = metrics.height + ceil(metrics.sideBearing.y - metrics.otherSideBearing.y) + 1; |
| 357 | |
| 358 | glyph->fTop = -metrics.topLeft.y; |
| 359 | glyph->fLeft = metrics.topLeft.x; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | void SkScalerContext_Mac::generateFontMetrics(SkPaint::FontMetrics* mx, SkPaint::FontMetrics* my) { |
| 364 | //SkASSERT(false); |
| 365 | if (mx) |
| 366 | memset(mx, 0, sizeof(SkPaint::FontMetrics)); |
| 367 | if (my) |
| 368 | memset(my, 0, sizeof(SkPaint::FontMetrics)); |
| 369 | return; |
| 370 | } |
| 371 | |
| 372 | void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) |
| 373 | { |
| 374 | SkAutoMutexAcquire ac(gFTMutex); |
| 375 | |
| 376 | GlyphID glyphID = glyph.fID; |
| 377 | ATSGlyphScreenMetrics metrics= { 0 }; |
| 378 | |
| 379 | SkASSERT(fLayout); |
| 380 | OSStatus err = ::ATSUGlyphGetScreenMetrics(fStyle,1,&glyphID,0,true,true,&metrics); |
| 381 | |
| 382 | // uint32_t w = metrics.width; |
| 383 | // uint32_t h = metrics.height; |
| 384 | // uint32_t pitch = (w + 3) & ~0x3; |
| 385 | // if (pitch != glyph.rowBytes()) { |
| 386 | // SkASSERT(false); // it's different from previously cacluated in generateMetrics(), so the size of glyph.fImage buffer is incorrect! |
| 387 | // } |
| 388 | |
| 389 | CGColorSpaceRef greyColorSpace = ::CGColorSpaceCreateWithName(kCGColorSpaceGenericGray); |
| 390 | CGContextRef contextRef = ::CGBitmapContextCreate((uint8_t*)glyph.fImage, glyph.fWidth, glyph.fHeight, 8, glyph.rowBytes(), greyColorSpace, kCGImageAlphaNone); |
| 391 | if (!contextRef) { |
| 392 | SkASSERT(false); |
| 393 | return; |
| 394 | } |
| 395 | |
| 396 | ::CGContextSetFillColorSpace(contextRef, greyColorSpace); |
| 397 | ::CGContextSetStrokeColorSpace(contextRef, greyColorSpace); |
| 398 | |
| 399 | ::CGContextSetGrayFillColor(contextRef, 0.0, 1.0); |
| 400 | ::CGContextFillRect(contextRef, ::CGRectMake(0, 0, glyph.fWidth, glyph.fHeight)); |
| 401 | |
| 402 | ::CGContextSetGrayFillColor(contextRef, 1.0, 1.0); |
| 403 | ::CGContextSetGrayStrokeColor(contextRef, 1.0, 1.0); |
| 404 | ::CGContextSetTextDrawingMode(contextRef, kCGTextFill); |
| 405 | |
| 406 | ATSUAttributeTag tag = kATSUCGContextTag; |
| 407 | ByteCount size = sizeof(CGContextRef); |
| 408 | ATSUAttributeValuePtr value = &contextRef; |
| 409 | err = ::ATSUSetLayoutControls(fLayout,1,&tag,&size,&value); |
| 410 | err = ::ATSUDrawText(fLayout,kATSUFromTextBeginning,kATSUToTextEnd,FloatToFixed(-metrics.topLeft.x),FloatToFixed(glyph.fHeight-metrics.topLeft.y)); |
| 411 | ::CGContextRelease(contextRef); |
| 412 | } |
| 413 | |
| 414 | void SkScalerContext_Mac::generatePath(const SkGlyph& glyph, SkPath* path) |
| 415 | { |
| 416 | SkAutoMutexAcquire ac(gFTMutex); |
| 417 | OSStatus err,result; |
| 418 | |
| 419 | err = ::ATSUGlyphGetCubicPaths( |
| 420 | fStyle,glyph.fID, |
| 421 | &SkScalerContext_Mac::MoveTo, |
| 422 | &SkScalerContext_Mac::Line, |
| 423 | &SkScalerContext_Mac::Curve, |
| 424 | &SkScalerContext_Mac::Close, |
| 425 | path,&result); |
| 426 | SkASSERT(err == noErr); |
| 427 | } |
| 428 | |
| 429 | void SkScalerContext_Mac::generateLineHeight(SkPoint* ascent, SkPoint* descent) |
| 430 | { |
| 431 | ATSUTextMeasurement textAscent, textDescent; |
| 432 | ByteCount actual = 0; |
| 433 | OSStatus err = ::ATSUGetAttribute(fStyle,kATSULineAscentTag,sizeof(ATSUTextMeasurement),&textAscent,&actual); |
| 434 | ascent->set(0,textAscent); |
| 435 | err = ::ATSUGetAttribute(fStyle,kATSULineDescentTag,sizeof(ATSUTextMeasurement),&textDescent,&actual); |
| 436 | descent->set(0,textDescent); |
| 437 | } |
| 438 | |
| 439 | OSStatus SkScalerContext_Mac::MoveTo(const Float32Point *pt, void *cb) |
| 440 | { |
| 441 | reinterpret_cast<SkPath*>(cb)->moveTo(F32PtToSkPoint(*pt)); |
| 442 | return noErr; |
| 443 | } |
| 444 | |
| 445 | OSStatus SkScalerContext_Mac::Line(const Float32Point *pt, void *cb) |
| 446 | { |
| 447 | reinterpret_cast<SkPath*>(cb)->lineTo(F32PtToSkPoint(*pt)); |
| 448 | return noErr; |
| 449 | } |
| 450 | |
| 451 | OSStatus SkScalerContext_Mac::Curve(const Float32Point *pt1, const Float32Point *pt2, const Float32Point *pt3, void *cb) |
| 452 | { |
| 453 | reinterpret_cast<SkPath*>(cb)->cubicTo(F32PtToSkPoint(*pt1),F32PtToSkPoint(*pt2),F32PtToSkPoint(*pt3)); |
| 454 | return noErr; |
| 455 | } |
| 456 | |
| 457 | OSStatus SkScalerContext_Mac::Close(void *cb) |
| 458 | { |
| 459 | reinterpret_cast<SkPath*>(cb)->close(); |
| 460 | return noErr; |
| 461 | } |
| 462 | |
| 463 | #pragma mark - |
| 464 | |
| 465 | void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) { |
| 466 | SkASSERT(!"SkFontHost::Serialize unimplemented"); |
| 467 | } |
| 468 | |
| 469 | SkTypeface* SkFontHost::Deserialize(SkStream* stream) { |
| 470 | SkASSERT(!"SkFontHost::Deserialize unimplemented"); |
| 471 | return NULL; |
| 472 | } |
| 473 | |
| 474 | SkTypeface* SkFontHost::CreateTypeface(SkStream* stream) { |
| 475 | |
| 476 | //Should not be used on Mac, keep linker happy |
| 477 | SkASSERT(false); |
| 478 | return CreateTypeface_(gDefaultfont,SkTypeface::kNormal); |
| 479 | } |
| 480 | |
| 481 | SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) |
| 482 | { |
| 483 | return new SkScalerContext_Mac(desc); |
| 484 | } |
| 485 | |
| 486 | SkScalerContext* SkFontHost::CreateFallbackScalerContext(const SkScalerContext::Rec& rec) |
| 487 | { |
| 488 | SkAutoDescriptor ad(sizeof(rec) + sizeof(gDefaultfont) + SkDescriptor::ComputeOverhead(2)); |
| 489 | SkDescriptor* desc = ad.getDesc(); |
| 490 | |
| 491 | desc->init(); |
| 492 | SkScalerContext::Rec* newRec = |
| 493 | (SkScalerContext::Rec*)desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); |
| 494 | |
| 495 | CreateTypeface_(gDefaultfont,SkTypeface::kNormal); |
| 496 | newRec->fFontID = FontFaceChecksum(gDefaultfont,SkTypeface::kNormal); |
| 497 | desc->computeChecksum(); |
| 498 | |
| 499 | return SkFontHost::CreateScalerContext(desc); |
| 500 | } |
| 501 | |
| 502 | |
| 503 | /** Return the closest matching typeface given either an existing family |
| 504 | (specified by a typeface in that family) or by a familyName, and a |
| 505 | requested style. |
| 506 | 1) If familyFace is null, use famillyName. |
| 507 | 2) If famillyName is null, use familyFace. |
| 508 | 3) If both are null, return the default font that best matches style |
| 509 | This MUST not return NULL. |
| 510 | */ |
| 511 | |
| 512 | SkTypeface* SkFontHost::FindTypeface(const SkTypeface* familyFace, const char familyName[], SkTypeface::Style style) { |
| 513 | |
| 514 | SkAutoMutexAcquire ac(gFTMutex); |
| 515 | |
| 516 | // clip to legal style bits |
| 517 | style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic); |
| 518 | |
| 519 | SkTypeface* tf = NULL; |
| 520 | |
| 521 | if (NULL == familyFace && NULL == familyName) { |
| 522 | tf = CreateTypeface_(gDefaultfont,style); |
| 523 | } |
| 524 | else { |
| 525 | if (NULL != familyFace) { |
| 526 | uint32_t id = familyFace->uniqueID(); |
| 527 | SkFaceRec* rec = find_ft_face(id); |
| 528 | if (!rec) { |
| 529 | SkASSERT(false); |
| 530 | tf = CreateTypeface_(gDefaultfont,style); |
| 531 | } |
| 532 | else { |
| 533 | tf = CreateTypeface_(rec,style); |
| 534 | } |
| 535 | } |
| 536 | else { |
| 537 | tf = CreateTypeface_(familyName,style); |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | if (NULL == tf) { |
| 542 | tf = CreateTypeface_(gDefaultfont,style); |
| 543 | } |
| 544 | return tf; |
| 545 | |
| 546 | } |
| 547 | |
| 548 | size_t SkFontHost::ShouldPurgeFontCache(size_t sizeAllocatedSoFar) { |
| 549 | if (sizeAllocatedSoFar > FONT_CACHE_MEMORY_BUDGET) |
| 550 | return sizeAllocatedSoFar - FONT_CACHE_MEMORY_BUDGET; |
| 551 | else |
| 552 | return 0; // nothing to do |
| 553 | } |
| 554 | |
| 555 | int SkFontHost::ComputeGammaFlag(const SkPaint& paint) { |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | void SkFontHost::GetGammaTables(const uint8_t* tables[2]) { |
| 560 | tables[0] = NULL; // black gamma (e.g. exp=1.4) |
| 561 | tables[1] = NULL; // white gamma (e.g. exp= 1/1.4) |
| 562 | } |
| 563 | |