reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* libs/graphics/ports/SkFontHost_FreeType.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 18 | #include "SkBitmap.h" |
| 19 | #include "SkCanvas.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 20 | #include "SkColorPriv.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 21 | #include "SkDescriptor.h" |
| 22 | #include "SkFDot6.h" |
| 23 | #include "SkFontHost.h" |
| 24 | #include "SkMask.h" |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 25 | #include "SkAdvancedTypefaceMetrics.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 26 | #include "SkScalerContext.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 27 | #include "SkStream.h" |
| 28 | #include "SkString.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 29 | #include "SkTemplates.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 30 | #include "SkThread.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 31 | |
| 32 | #include <ft2build.h> |
| 33 | #include FT_FREETYPE_H |
| 34 | #include FT_OUTLINE_H |
| 35 | #include FT_SIZES_H |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 36 | #include FT_TRUETYPE_TABLES_H |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 37 | #include FT_TYPE1_TABLES_H |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 38 | #include FT_BITMAP_H |
agl@chromium.org | 36bb697 | 2010-06-04 20:57:16 +0000 | [diff] [blame] | 39 | // In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file. |
| 40 | #include FT_SYNTHESIS_H |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 41 | #include FT_XFREE86_H |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 42 | |
reed@android.com | f549369 | 2009-07-22 19:21:01 +0000 | [diff] [blame] | 43 | #if defined(SK_SUPPORT_LCDTEXT) |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 44 | #include FT_LCD_FILTER_H |
| 45 | #endif |
| 46 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 47 | #ifdef FT_ADVANCES_H |
| 48 | #include FT_ADVANCES_H |
| 49 | #endif |
| 50 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 51 | #if 0 |
| 52 | // Also include the files by name for build tools which require this. |
| 53 | #include <freetype/freetype.h> |
| 54 | #include <freetype/ftoutln.h> |
| 55 | #include <freetype/ftsizes.h> |
| 56 | #include <freetype/tttables.h> |
| 57 | #include <freetype/ftadvanc.h> |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 58 | #include <freetype/ftlcdfil.h> |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 59 | #include <freetype/ftbitmap.h> |
agl@chromium.org | 36bb697 | 2010-06-04 20:57:16 +0000 | [diff] [blame] | 60 | #include <freetype/ftsynth.h> |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 61 | #endif |
| 62 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 63 | //#define ENABLE_GLYPH_SPEW // for tracing calls |
| 64 | //#define DUMP_STRIKE_CREATION |
| 65 | |
| 66 | #ifdef SK_DEBUG |
| 67 | #define SkASSERT_CONTINUE(pred) \ |
| 68 | do { \ |
| 69 | if (!(pred)) \ |
| 70 | SkDebugf("file %s:%d: assert failed '" #pred "'\n", __FILE__, __LINE__); \ |
| 71 | } while (false) |
| 72 | #else |
| 73 | #define SkASSERT_CONTINUE(pred) |
| 74 | #endif |
| 75 | |
| 76 | ////////////////////////////////////////////////////////////////////////// |
| 77 | |
| 78 | struct SkFaceRec; |
| 79 | |
| 80 | static SkMutex gFTMutex; |
| 81 | static int gFTCount; |
| 82 | static FT_Library gFTLibrary; |
| 83 | static SkFaceRec* gFaceRecHead; |
agl@chromium.org | f18d876 | 2009-07-28 18:38:08 +0000 | [diff] [blame] | 84 | static bool gLCDSupportValid; // true iff |gLCDSupport| has been set. |
| 85 | static bool gLCDSupport; // true iff LCD is supported by the runtime. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 86 | |
| 87 | ///////////////////////////////////////////////////////////////////////// |
| 88 | |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 89 | // See http://freetype.sourceforge.net/freetype2/docs/reference/ft2-bitmap_handling.html#FT_Bitmap_Embolden |
| 90 | // This value was chosen by eyeballing the result in Firefox and trying to match it. |
| 91 | static const FT_Pos kBitmapEmboldenStrength = 1 << 6; |
| 92 | |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 93 | static bool |
| 94 | InitFreetype() { |
| 95 | FT_Error err = FT_Init_FreeType(&gFTLibrary); |
| 96 | if (err) |
| 97 | return false; |
| 98 | |
reed@android.com | f549369 | 2009-07-22 19:21:01 +0000 | [diff] [blame] | 99 | #if defined(SK_SUPPORT_LCDTEXT) |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 100 | // Setup LCD filtering. This reduces colour fringes for LCD rendered |
| 101 | // glyphs. |
| 102 | err = FT_Library_SetLcdFilter(gFTLibrary, FT_LCD_FILTER_DEFAULT); |
agl@chromium.org | f18d876 | 2009-07-28 18:38:08 +0000 | [diff] [blame] | 103 | gLCDSupport = err == 0; |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 104 | #endif |
reed@android.com | 61608aa | 2009-07-31 14:52:54 +0000 | [diff] [blame] | 105 | gLCDSupportValid = true; |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 106 | |
| 107 | return true; |
| 108 | } |
| 109 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 110 | class SkScalerContext_FreeType : public SkScalerContext { |
| 111 | public: |
| 112 | SkScalerContext_FreeType(const SkDescriptor* desc); |
| 113 | virtual ~SkScalerContext_FreeType(); |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 114 | |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 115 | bool success() const { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 116 | return fFaceRec != NULL && |
| 117 | fFTSize != NULL && |
| 118 | fFace != NULL; |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 119 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 120 | |
| 121 | protected: |
| 122 | virtual unsigned generateGlyphCount() const; |
| 123 | virtual uint16_t generateCharToGlyph(SkUnichar uni); |
| 124 | virtual void generateAdvance(SkGlyph* glyph); |
| 125 | virtual void generateMetrics(SkGlyph* glyph); |
| 126 | virtual void generateImage(const SkGlyph& glyph); |
| 127 | virtual void generatePath(const SkGlyph& glyph, SkPath* path); |
| 128 | virtual void generateFontMetrics(SkPaint::FontMetrics* mx, |
| 129 | SkPaint::FontMetrics* my); |
reed@android.com | 9d3a985 | 2010-01-08 14:07:42 +0000 | [diff] [blame] | 130 | virtual SkUnichar generateGlyphToChar(uint16_t glyph); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 131 | |
| 132 | private: |
| 133 | SkFaceRec* fFaceRec; |
| 134 | FT_Face fFace; // reference to shared face in gFaceRecHead |
| 135 | FT_Size fFTSize; // our own copy |
| 136 | SkFixed fScaleX, fScaleY; |
| 137 | FT_Matrix fMatrix22; |
| 138 | uint32_t fLoadGlyphFlags; |
| 139 | |
| 140 | FT_Error setupSize(); |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 141 | void emboldenOutline(FT_Outline* outline); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 142 | }; |
| 143 | |
| 144 | /////////////////////////////////////////////////////////////////////////// |
| 145 | /////////////////////////////////////////////////////////////////////////// |
| 146 | |
| 147 | #include "SkStream.h" |
| 148 | |
| 149 | struct SkFaceRec { |
| 150 | SkFaceRec* fNext; |
| 151 | FT_Face fFace; |
| 152 | FT_StreamRec fFTStream; |
| 153 | SkStream* fSkStream; |
| 154 | uint32_t fRefCnt; |
| 155 | uint32_t fFontID; |
| 156 | |
reed@android.com | b1d9d2e | 2009-03-04 17:37:51 +0000 | [diff] [blame] | 157 | // assumes ownership of the stream, will call unref() when its done |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 158 | SkFaceRec(SkStream* strm, uint32_t fontID); |
| 159 | ~SkFaceRec() { |
reed@android.com | b1d9d2e | 2009-03-04 17:37:51 +0000 | [diff] [blame] | 160 | fSkStream->unref(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 161 | } |
| 162 | }; |
| 163 | |
| 164 | extern "C" { |
| 165 | static unsigned long sk_stream_read(FT_Stream stream, |
| 166 | unsigned long offset, |
| 167 | unsigned char* buffer, |
| 168 | unsigned long count ) { |
| 169 | SkStream* str = (SkStream*)stream->descriptor.pointer; |
| 170 | |
| 171 | if (count) { |
| 172 | if (!str->rewind()) { |
| 173 | return 0; |
| 174 | } else { |
| 175 | unsigned long ret; |
| 176 | if (offset) { |
| 177 | ret = str->read(NULL, offset); |
| 178 | if (ret != offset) { |
| 179 | return 0; |
| 180 | } |
| 181 | } |
| 182 | ret = str->read(buffer, count); |
| 183 | if (ret != count) { |
| 184 | return 0; |
| 185 | } |
| 186 | count = ret; |
| 187 | } |
| 188 | } |
| 189 | return count; |
| 190 | } |
| 191 | |
| 192 | static void sk_stream_close( FT_Stream stream) {} |
| 193 | } |
| 194 | |
| 195 | SkFaceRec::SkFaceRec(SkStream* strm, uint32_t fontID) |
| 196 | : fSkStream(strm), fFontID(fontID) { |
| 197 | // SkDEBUGF(("SkFaceRec: opening %s (%p)\n", key.c_str(), strm)); |
| 198 | |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 199 | sk_bzero(&fFTStream, sizeof(fFTStream)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 200 | fFTStream.size = fSkStream->getLength(); |
| 201 | fFTStream.descriptor.pointer = fSkStream; |
| 202 | fFTStream.read = sk_stream_read; |
| 203 | fFTStream.close = sk_stream_close; |
| 204 | } |
| 205 | |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 206 | // Will return 0 on failure |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 207 | static SkFaceRec* ref_ft_face(uint32_t fontID) { |
| 208 | SkFaceRec* rec = gFaceRecHead; |
| 209 | while (rec) { |
| 210 | if (rec->fFontID == fontID) { |
| 211 | SkASSERT(rec->fFace); |
| 212 | rec->fRefCnt += 1; |
| 213 | return rec; |
| 214 | } |
| 215 | rec = rec->fNext; |
| 216 | } |
| 217 | |
| 218 | SkStream* strm = SkFontHost::OpenStream(fontID); |
| 219 | if (NULL == strm) { |
| 220 | SkDEBUGF(("SkFontHost::OpenStream failed opening %x\n", fontID)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | // this passes ownership of strm to the rec |
| 225 | rec = SkNEW_ARGS(SkFaceRec, (strm, fontID)); |
| 226 | |
| 227 | FT_Open_Args args; |
| 228 | memset(&args, 0, sizeof(args)); |
| 229 | const void* memoryBase = strm->getMemoryBase(); |
| 230 | |
| 231 | if (NULL != memoryBase) { |
| 232 | //printf("mmap(%s)\n", keyString.c_str()); |
| 233 | args.flags = FT_OPEN_MEMORY; |
| 234 | args.memory_base = (const FT_Byte*)memoryBase; |
| 235 | args.memory_size = strm->getLength(); |
| 236 | } else { |
| 237 | //printf("fopen(%s)\n", keyString.c_str()); |
| 238 | args.flags = FT_OPEN_STREAM; |
| 239 | args.stream = &rec->fFTStream; |
| 240 | } |
| 241 | |
agl@chromium.org | 61a678a | 2010-08-06 18:08:18 +0000 | [diff] [blame] | 242 | int face_index; |
| 243 | int length = SkFontHost::GetFileName(fontID, NULL, 0, &face_index); |
| 244 | FT_Error err = FT_Open_Face(gFTLibrary, &args, length ? face_index : 0, |
| 245 | &rec->fFace); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 246 | |
| 247 | if (err) { // bad filename, try the default font |
| 248 | fprintf(stderr, "ERROR: unable to open font '%x'\n", fontID); |
| 249 | SkDELETE(rec); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 250 | return 0; |
| 251 | } else { |
| 252 | SkASSERT(rec->fFace); |
| 253 | //fprintf(stderr, "Opened font '%s'\n", filename.c_str()); |
| 254 | rec->fNext = gFaceRecHead; |
| 255 | gFaceRecHead = rec; |
| 256 | rec->fRefCnt = 1; |
| 257 | return rec; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | static void unref_ft_face(FT_Face face) { |
| 262 | SkFaceRec* rec = gFaceRecHead; |
| 263 | SkFaceRec* prev = NULL; |
| 264 | while (rec) { |
| 265 | SkFaceRec* next = rec->fNext; |
| 266 | if (rec->fFace == face) { |
| 267 | if (--rec->fRefCnt == 0) { |
| 268 | if (prev) { |
| 269 | prev->fNext = next; |
| 270 | } else { |
| 271 | gFaceRecHead = next; |
| 272 | } |
| 273 | FT_Done_Face(face); |
| 274 | SkDELETE(rec); |
| 275 | } |
| 276 | return; |
| 277 | } |
| 278 | prev = rec; |
| 279 | rec = next; |
| 280 | } |
| 281 | SkASSERT("shouldn't get here, face not in list"); |
| 282 | } |
| 283 | |
| 284 | /////////////////////////////////////////////////////////////////////////// |
| 285 | |
vandebo@chromium.org | 16be6b8 | 2011-01-28 21:28:56 +0000 | [diff] [blame] | 286 | // Work around for old versions of freetype. |
| 287 | static FT_Error getAdvances(FT_Face face, FT_UInt start, FT_UInt count, |
| 288 | FT_Int32 loadFlags, FT_Fixed* advances) { |
| 289 | #ifdef FT_ADVANCES_H |
| 290 | return FT_Get_Advances(face, start, count, loadFlags, advances); |
| 291 | #else |
| 292 | if (!face || start >= face->num_glyphs || |
| 293 | start + count > face->num_glyphs || loadFlags != FT_LOAD_NO_SCALE) { |
| 294 | return 6; // "Invalid argument." |
| 295 | } |
| 296 | if (count == 0) |
| 297 | return 0; |
| 298 | |
| 299 | for (int i = 0; i < count; i++) { |
| 300 | FT_Error err = FT_Load_Glyph(face, start + i, FT_LOAD_NO_SCALE); |
| 301 | if (err) |
| 302 | return err; |
| 303 | advances[i] = face->glyph->advance.x; |
| 304 | } |
| 305 | |
| 306 | return 0; |
| 307 | #endif |
| 308 | } |
| 309 | |
| 310 | static bool canEmbed(FT_Face face) { |
| 311 | #ifdef FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |
| 312 | FT_UShort fsType = FT_Get_FSType_Flags(face); |
| 313 | return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING | |
| 314 | FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0; |
| 315 | #else |
| 316 | // No embedding is 0x2 and bitmap embedding only is 0x200. |
| 317 | TT_OS2* os2_table; |
| 318 | if ((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { |
| 319 | return (os2_table->fsType & 0x202) == 0; |
| 320 | } |
| 321 | return false; // We tried, fail safe. |
| 322 | #endif |
| 323 | } |
| 324 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 325 | static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) { |
| 326 | const FT_UInt glyph_id = FT_Get_Char_Index(face, letter); |
| 327 | if (!glyph_id) |
| 328 | return false; |
| 329 | FT_Load_Glyph(face, glyph_id, FT_LOAD_NO_SCALE); |
| 330 | FT_Outline_Get_CBox(&face->glyph->outline, bbox); |
| 331 | return true; |
| 332 | } |
| 333 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 334 | static int16_t getWidthAdvance(FT_Face face, int gId) { |
| 335 | FT_Fixed advance = 0; |
| 336 | SkAssertResult(getAdvances(face, gId, 1, FT_LOAD_NO_SCALE, &advance) == 0); |
| 337 | return advance; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | template <typename Data> |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 341 | static void resetRange(SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* range, |
vandebo@chromium.org | 16be6b8 | 2011-01-28 21:28:56 +0000 | [diff] [blame] | 342 | int startId) { |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 343 | range->fStartId = startId; |
| 344 | range->fAdvance.setCount(0); |
| 345 | } |
| 346 | |
| 347 | template <typename Data> |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 348 | static SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* appendRange( |
| 349 | SkTScopedPtr<SkAdvancedTypefaceMetrics::AdvanceMetric<Data> >* nextSlot, |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 350 | int startId) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 351 | nextSlot->reset(new SkAdvancedTypefaceMetrics::AdvanceMetric<Data>); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 352 | resetRange(nextSlot->get(), startId); |
| 353 | return nextSlot->get(); |
| 354 | } |
| 355 | |
| 356 | template <typename Data> |
vandebo@chromium.org | 16be6b8 | 2011-01-28 21:28:56 +0000 | [diff] [blame] | 357 | static void finishRange( |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 358 | SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* range, |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 359 | int endId, |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 360 | typename SkAdvancedTypefaceMetrics::AdvanceMetric<Data>::MetricType |
| 361 | type) { |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 362 | range->fEndId = endId; |
| 363 | range->fType = type; |
| 364 | int newLength; |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 365 | if (type == SkAdvancedTypefaceMetrics::AdvanceMetric<Data>::kRange) |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 366 | newLength = endId - range->fStartId + 1; |
| 367 | else |
| 368 | newLength = 1; |
| 369 | SkASSERT(range->fAdvance.count() >= newLength); |
| 370 | range->fAdvance.setCount(newLength); |
| 371 | } |
| 372 | |
| 373 | template <typename Data> |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 374 | static SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* getAdvanceData( |
| 375 | FT_Face face, Data (*getAdvance)(FT_Face face, int gId)) { |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 376 | // Assuming that an ASCII representation of a width or a glyph id is, |
| 377 | // on average, 3 characters long gives the following cut offs for |
| 378 | // using different range types: |
| 379 | // When currently in a range |
| 380 | // - Removing 4 0's is a win |
| 381 | // - Removing 5 repeats is a win |
| 382 | // When not currently in a range |
| 383 | // - Removing 1 0 is a win |
| 384 | // - Removing 3 repeats is a win |
| 385 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 386 | SkTScopedPtr<SkAdvancedTypefaceMetrics::AdvanceMetric<Data> > result; |
| 387 | SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* curRange; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 388 | curRange = appendRange(&result, 0); |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 389 | Data lastAdvance = SHRT_MIN; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 390 | int repeats = 0; |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 391 | for (int gId = 0; gId < face->num_glyphs; gId++) { |
| 392 | Data advance = getAdvance(face, gId); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 393 | if (advance == lastAdvance) { |
| 394 | repeats++; |
| 395 | } else if (curRange->fAdvance.count() == repeats + 1) { |
| 396 | if (lastAdvance == 0 && repeats >= 0) { |
| 397 | resetRange(curRange, gId); |
| 398 | } else if (repeats >= 2) { |
| 399 | finishRange(curRange, gId - 1, |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 400 | SkAdvancedTypefaceMetrics::WidthRange::kRun); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 401 | curRange = appendRange(&curRange->fNext, gId); |
| 402 | } |
| 403 | repeats = 0; |
| 404 | } else { |
| 405 | if (lastAdvance == 0 && repeats >= 3) { |
| 406 | finishRange(curRange, gId - repeats - 2, |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 407 | SkAdvancedTypefaceMetrics::WidthRange::kRange); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 408 | curRange = appendRange(&curRange->fNext, gId); |
| 409 | } else if (repeats >= 4) { |
| 410 | finishRange(curRange, gId - repeats - 2, |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 411 | SkAdvancedTypefaceMetrics::WidthRange::kRange); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 412 | curRange = appendRange(&curRange->fNext, gId - repeats - 1); |
| 413 | curRange->fAdvance.append(1, &lastAdvance); |
| 414 | finishRange(curRange, gId - 1, |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 415 | SkAdvancedTypefaceMetrics::WidthRange::kRun); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 416 | curRange = appendRange(&curRange->fNext, gId); |
| 417 | } |
| 418 | repeats = 0; |
| 419 | } |
| 420 | curRange->fAdvance.append(1, &advance); |
| 421 | lastAdvance = advance; |
| 422 | } |
| 423 | finishRange(curRange, face->num_glyphs - 1, |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 424 | SkAdvancedTypefaceMetrics::WidthRange::kRange); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 425 | return result.release(); |
| 426 | } |
| 427 | |
| 428 | // static |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 429 | SkAdvancedTypefaceMetrics* SkFontHost::GetAdvancedTypefaceMetrics( |
| 430 | uint32_t fontID, bool perGlyphInfo) { |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 431 | SkAutoMutexAcquire ac(gFTMutex); |
| 432 | FT_Library libInit = NULL; |
| 433 | if (gFTCount == 0) { |
| 434 | if (!InitFreetype()) |
| 435 | sk_throw(); |
| 436 | libInit = gFTLibrary; |
| 437 | } |
| 438 | SkAutoTCallIProc<struct FT_LibraryRec_, FT_Done_FreeType> ftLib(libInit); |
| 439 | SkFaceRec* rec = ref_ft_face(fontID); |
| 440 | if (NULL == rec) |
| 441 | return NULL; |
| 442 | FT_Face face = rec->fFace; |
| 443 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 444 | SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; |
| 445 | info->fFontName.set(FT_Get_Postscript_Name(face)); |
| 446 | info->fMultiMaster = FT_HAS_MULTIPLE_MASTERS(face); |
| 447 | info->fLastGlyphID = face->num_glyphs - 1; |
| 448 | info->fEmSize = 1000; |
| 449 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 450 | bool cid = false; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 451 | const char* fontType = FT_Get_X11_Font_Format(face); |
vandebo@chromium.org | c3a2ae5 | 2011-02-03 21:48:23 +0000 | [diff] [blame^] | 452 | if (strcmp(fontType, "Type 1") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 453 | info->fType = SkAdvancedTypefaceMetrics::kType1_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 454 | } else if (strcmp(fontType, "CID Type 1") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 455 | info->fType = SkAdvancedTypefaceMetrics::kType1CID_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 456 | cid = true; |
| 457 | } else if (strcmp(fontType, "CFF") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 458 | info->fType = SkAdvancedTypefaceMetrics::kCFF_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 459 | } else if (strcmp(fontType, "TrueType") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 460 | info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 461 | cid = true; |
| 462 | TT_Header* ttHeader; |
| 463 | if ((ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, |
| 464 | ft_sfnt_head)) != NULL) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 465 | info->fEmSize = ttHeader->Units_Per_EM; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 466 | } |
| 467 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 468 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 469 | SkASSERT(!FT_HAS_VERTICAL(face)); |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 470 | #ifdef FT_IS_CID_KEYED |
| 471 | SkASSERT(FT_IS_CID_KEYED(face) == |
| 472 | (info->fType == SkAdvancedTypefaceMetrics::kType1CID_Font)); |
| 473 | #endif |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 474 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 475 | info->fStyle = 0; |
| 476 | if (FT_IS_FIXED_WIDTH(face)) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 477 | info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 478 | if (face->style_flags & FT_STYLE_FLAG_ITALIC) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 479 | info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 480 | // We should set either Symbolic or Nonsymbolic; Nonsymbolic if the font's |
| 481 | // character set is a subset of 'Adobe standard Latin.' |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 482 | info->fStyle |= SkAdvancedTypefaceMetrics::kSymbolic_Style; |
| 483 | |
| 484 | PS_FontInfoRec ps_info; |
| 485 | TT_Postscript* tt_info; |
| 486 | if (FT_Get_PS_Font_Info(face, &ps_info) == 0) { |
| 487 | info->fItalicAngle = ps_info.italic_angle; |
| 488 | } else if ((tt_info = |
| 489 | (TT_Postscript*)FT_Get_Sfnt_Table(face, |
| 490 | ft_sfnt_post)) != NULL) { |
| 491 | info->fItalicAngle = SkFixedToScalar(tt_info->italicAngle); |
| 492 | } else { |
| 493 | info->fItalicAngle = 0; |
| 494 | } |
| 495 | |
| 496 | info->fAscent = face->ascender; |
| 497 | info->fDescent = face->descender; |
| 498 | |
| 499 | // Figure out a good guess for StemV - Min width of i, I, !, 1. |
| 500 | // This probably isn't very good with an italic font. |
| 501 | int16_t min_width = SHRT_MAX; |
| 502 | char stem_chars[] = {'i', 'I', '!', '1'}; |
| 503 | for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { |
| 504 | FT_BBox bbox; |
| 505 | if (GetLetterCBox(face, stem_chars[i], &bbox)) { |
| 506 | int16_t width = bbox.xMax - bbox.xMin; |
| 507 | if (width > 0 && width < min_width) { |
| 508 | min_width = width; |
| 509 | info->fStemV = min_width; |
| 510 | } |
| 511 | } |
| 512 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 513 | |
| 514 | TT_PCLT* pclt_info; |
| 515 | TT_OS2* os2_table; |
| 516 | if ((pclt_info = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != NULL) { |
| 517 | info->fCapHeight = pclt_info->CapHeight; |
| 518 | uint8_t serif_style = pclt_info->SerifStyle & 0x3F; |
| 519 | if (serif_style >= 2 && serif_style <= 6) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 520 | info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 521 | else if (serif_style >= 9 && serif_style <= 12) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 522 | info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 523 | } else if ((os2_table = |
| 524 | (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { |
| 525 | info->fCapHeight = os2_table->sCapHeight; |
| 526 | } else { |
| 527 | // Figure out a good guess for CapHeight: average the height of M and X. |
| 528 | FT_BBox m_bbox, x_bbox; |
| 529 | bool got_m, got_x; |
| 530 | got_m = GetLetterCBox(face, 'M', &m_bbox); |
| 531 | got_x = GetLetterCBox(face, 'X', &x_bbox); |
| 532 | if (got_m && got_x) { |
| 533 | info->fCapHeight = (m_bbox.yMax - m_bbox.yMin + x_bbox.yMax - |
| 534 | x_bbox.yMin) / 2; |
| 535 | } else if (got_m && !got_x) { |
| 536 | info->fCapHeight = m_bbox.yMax - m_bbox.yMin; |
| 537 | } else if (!got_m && got_x) { |
| 538 | info->fCapHeight = x_bbox.yMax - x_bbox.yMin; |
| 539 | } |
| 540 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 541 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 542 | info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, |
| 543 | face->bbox.xMax, face->bbox.yMin); |
| 544 | |
vandebo@chromium.org | c3a2ae5 | 2011-02-03 21:48:23 +0000 | [diff] [blame^] | 545 | if (perGlyphInfo && canEmbed(face) && FT_IS_SCALABLE(face) && |
| 546 | info->fType != SkAdvancedTypefaceMetrics::kOther_Font) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 547 | if (FT_IS_FIXED_WIDTH(face)) { |
| 548 | appendRange(&info->fGlyphWidths, 0); |
| 549 | int16_t advance = face->max_advance_width; |
| 550 | info->fGlyphWidths->fAdvance.append(1, &advance); |
| 551 | finishRange(info->fGlyphWidths.get(), 0, |
| 552 | SkAdvancedTypefaceMetrics::WidthRange::kDefault); |
| 553 | } else if(!cid) { |
| 554 | appendRange(&info->fGlyphWidths, 0); |
| 555 | // So as to not blow out the stack, get advances in batches. |
| 556 | for (int gID = 0; gID < face->num_glyphs; gID += 128) { |
| 557 | FT_Fixed advances[128]; |
| 558 | int advanceCount = 128; |
| 559 | if (gID + advanceCount > face->num_glyphs) |
| 560 | advanceCount = face->num_glyphs - gID + 1; |
| 561 | getAdvances(face, gID, advanceCount, FT_LOAD_NO_SCALE, |
| 562 | advances); |
| 563 | for (int i = 0; i < advanceCount; i++) { |
| 564 | int16_t advance = advances[gID + i]; |
| 565 | info->fGlyphWidths->fAdvance.append(1, &advance); |
| 566 | } |
| 567 | } |
| 568 | finishRange(info->fGlyphWidths.get(), face->num_glyphs - 1, |
| 569 | SkAdvancedTypefaceMetrics::WidthRange::kRange); |
| 570 | } else { |
| 571 | info->fGlyphWidths.reset(getAdvanceData(face, &getWidthAdvance)); |
| 572 | } |
| 573 | |
| 574 | if (info->fType == SkAdvancedTypefaceMetrics::kType1_Font) { |
| 575 | // Postscript fonts may contain more than 255 glyphs, so we end up |
| 576 | // using multiple font descriptions with a glyph ordering. Record |
| 577 | // the name of each glyph. |
| 578 | info->fGlyphNames.reset( |
| 579 | new SkAutoTArray<SkString>(face->num_glyphs)); |
| 580 | for (int gID = 0; gID < face->num_glyphs; gID++) { |
| 581 | char glyphName[128]; // PS limit for names is 127 bytes. |
| 582 | FT_Get_Glyph_Name(face, gID, glyphName, 128); |
| 583 | info->fGlyphNames->get()[gID].set(glyphName); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 584 | } |
| 585 | } |
| 586 | } |
| 587 | |
vandebo@chromium.org | c3a2ae5 | 2011-02-03 21:48:23 +0000 | [diff] [blame^] | 588 | if (!canEmbed(face)) |
| 589 | info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font; |
| 590 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 591 | unref_ft_face(face); |
| 592 | return info; |
| 593 | } |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 594 | /////////////////////////////////////////////////////////////////////////// |
| 595 | |
| 596 | void SkFontHost::FilterRec(SkScalerContext::Rec* rec) { |
| 597 | if (!gLCDSupportValid) { |
| 598 | InitFreetype(); |
| 599 | FT_Done_FreeType(gFTLibrary); |
| 600 | } |
| 601 | |
| 602 | if (!gLCDSupport && rec->isLCD()) { |
| 603 | // If the runtime Freetype library doesn't support LCD mode, we disable |
| 604 | // it here. |
| 605 | rec->fMaskFormat = SkMask::kA8_Format; |
| 606 | } |
| 607 | |
| 608 | SkPaint::Hinting h = rec->getHinting(); |
| 609 | if (SkPaint::kFull_Hinting == h && !rec->isLCD()) { |
| 610 | // collapse full->normal hinting if we're not doing LCD |
| 611 | h = SkPaint::kNormal_Hinting; |
| 612 | } else if ((rec->fFlags & SkScalerContext::kSubpixelPositioning_Flag) && |
| 613 | SkPaint::kNo_Hinting != h) { |
| 614 | // to do subpixel, we must have at most slight hinting |
| 615 | h = SkPaint::kSlight_Hinting; |
| 616 | } |
| 617 | rec->setHinting(h); |
| 618 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 619 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 620 | SkScalerContext_FreeType::SkScalerContext_FreeType(const SkDescriptor* desc) |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 621 | : SkScalerContext(desc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 622 | SkAutoMutexAcquire ac(gFTMutex); |
| 623 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 624 | if (gFTCount == 0) { |
reed@android.com | 659aaf9 | 2009-07-23 15:20:21 +0000 | [diff] [blame] | 625 | if (!InitFreetype()) { |
| 626 | sk_throw(); |
| 627 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 628 | } |
| 629 | ++gFTCount; |
| 630 | |
| 631 | // load the font file |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 632 | fFTSize = NULL; |
| 633 | fFace = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 634 | fFaceRec = ref_ft_face(fRec.fFontID); |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 635 | if (NULL == fFaceRec) { |
| 636 | return; |
| 637 | } |
| 638 | fFace = fFaceRec->fFace; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 639 | |
| 640 | // compute our factors from the record |
| 641 | |
| 642 | SkMatrix m; |
| 643 | |
| 644 | fRec.getSingleMatrix(&m); |
| 645 | |
| 646 | #ifdef DUMP_STRIKE_CREATION |
| 647 | SkString keyString; |
| 648 | SkFontHost::GetDescriptorKeyString(desc, &keyString); |
| 649 | printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n", SkScalarToFloat(fRec.fTextSize), |
| 650 | SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX), |
| 651 | SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0][1]), |
| 652 | SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1][1]), |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 653 | fRec.getHinting(), fRec.fMaskFormat, keyString.c_str()); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 654 | #endif |
| 655 | |
| 656 | // now compute our scale factors |
| 657 | SkScalar sx = m.getScaleX(); |
| 658 | SkScalar sy = m.getScaleY(); |
| 659 | |
| 660 | if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) { |
| 661 | // sort of give up on hinting |
| 662 | sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX())); |
| 663 | sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy)); |
| 664 | sx = sy = SkScalarAve(sx, sy); |
| 665 | |
| 666 | SkScalar inv = SkScalarInvert(sx); |
| 667 | |
| 668 | // flip the skew elements to go from our Y-down system to FreeType's |
| 669 | fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv)); |
| 670 | fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv)); |
| 671 | fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv)); |
| 672 | fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv)); |
| 673 | } else { |
| 674 | fMatrix22.xx = fMatrix22.yy = SK_Fixed1; |
| 675 | fMatrix22.xy = fMatrix22.yx = 0; |
| 676 | } |
| 677 | |
| 678 | fScaleX = SkScalarToFixed(sx); |
| 679 | fScaleY = SkScalarToFixed(sy); |
| 680 | |
| 681 | // compute the flags we send to Load_Glyph |
| 682 | { |
reed@android.com | e4d0bc0 | 2009-07-24 19:53:20 +0000 | [diff] [blame] | 683 | FT_Int32 loadFlags = FT_LOAD_DEFAULT; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 684 | |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 685 | if (SkMask::kBW_Format == fRec.fMaskFormat) { |
| 686 | // See http://code.google.com/p/chromium/issues/detail?id=43252#c24 |
| 687 | loadFlags = FT_LOAD_TARGET_MONO; |
| 688 | if (fRec.getHinting() == SkPaint::kNo_Hinting) |
| 689 | loadFlags = FT_LOAD_NO_HINTING; |
| 690 | } else { |
| 691 | switch (fRec.getHinting()) { |
| 692 | case SkPaint::kNo_Hinting: |
| 693 | loadFlags = FT_LOAD_NO_HINTING; |
| 694 | break; |
| 695 | case SkPaint::kSlight_Hinting: |
| 696 | loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT |
| 697 | break; |
| 698 | case SkPaint::kNormal_Hinting: |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 699 | if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) |
| 700 | loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| 701 | else |
| 702 | loadFlags = FT_LOAD_NO_AUTOHINT; |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 703 | break; |
| 704 | case SkPaint::kFull_Hinting: |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 705 | if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) { |
| 706 | loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| 707 | break; |
| 708 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 709 | loadFlags = FT_LOAD_TARGET_NORMAL; |
| 710 | if (SkMask::kHorizontalLCD_Format == fRec.fMaskFormat) |
| 711 | loadFlags = FT_LOAD_TARGET_LCD; |
| 712 | else if (SkMask::kVerticalLCD_Format == fRec.fMaskFormat) |
| 713 | loadFlags = FT_LOAD_TARGET_LCD_V; |
| 714 | break; |
| 715 | default: |
| 716 | SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting()); |
| 717 | break; |
| 718 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 719 | } |
| 720 | |
agl@chromium.org | 99e1b90 | 2010-01-05 01:19:44 +0000 | [diff] [blame] | 721 | if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) |
agl@chromium.org | e0d0899 | 2009-08-07 19:19:23 +0000 | [diff] [blame] | 722 | loadFlags |= FT_LOAD_NO_BITMAP; |
agl@chromium.org | e0d0899 | 2009-08-07 19:19:23 +0000 | [diff] [blame] | 723 | |
reed@android.com | e4d0bc0 | 2009-07-24 19:53:20 +0000 | [diff] [blame] | 724 | fLoadGlyphFlags = loadFlags; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | // now create the FT_Size |
| 728 | |
| 729 | { |
| 730 | FT_Error err; |
| 731 | |
| 732 | err = FT_New_Size(fFace, &fFTSize); |
| 733 | if (err != 0) { |
| 734 | SkDEBUGF(("SkScalerContext_FreeType::FT_New_Size(%x): FT_Set_Char_Size(0x%x, 0x%x) returned 0x%x\n", |
| 735 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 736 | fFace = NULL; |
| 737 | return; |
| 738 | } |
| 739 | |
| 740 | err = FT_Activate_Size(fFTSize); |
| 741 | if (err != 0) { |
| 742 | SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| 743 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 744 | fFTSize = NULL; |
| 745 | } |
| 746 | |
| 747 | err = FT_Set_Char_Size( fFace, |
| 748 | SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY), |
| 749 | 72, 72); |
| 750 | if (err != 0) { |
| 751 | SkDEBUGF(("SkScalerContext_FreeType::FT_Set_Char_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| 752 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 753 | fFace = NULL; |
| 754 | return; |
| 755 | } |
| 756 | |
| 757 | FT_Set_Transform( fFace, &fMatrix22, NULL); |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | SkScalerContext_FreeType::~SkScalerContext_FreeType() { |
| 762 | if (fFTSize != NULL) { |
| 763 | FT_Done_Size(fFTSize); |
| 764 | } |
| 765 | |
| 766 | SkAutoMutexAcquire ac(gFTMutex); |
| 767 | |
| 768 | if (fFace != NULL) { |
| 769 | unref_ft_face(fFace); |
| 770 | } |
| 771 | if (--gFTCount == 0) { |
| 772 | // SkDEBUGF(("FT_Done_FreeType\n")); |
| 773 | FT_Done_FreeType(gFTLibrary); |
| 774 | SkDEBUGCODE(gFTLibrary = NULL;) |
| 775 | } |
| 776 | } |
| 777 | |
| 778 | /* We call this before each use of the fFace, since we may be sharing |
| 779 | this face with other context (at different sizes). |
| 780 | */ |
| 781 | FT_Error SkScalerContext_FreeType::setupSize() { |
| 782 | /* In the off-chance that a font has been removed, we want to error out |
| 783 | right away, so call resolve just to be sure. |
| 784 | |
| 785 | TODO: perhaps we can skip this, by walking the global font cache and |
| 786 | killing all of the contexts when we know that a given fontID is going |
| 787 | away... |
| 788 | */ |
reed@android.com | b1d9d2e | 2009-03-04 17:37:51 +0000 | [diff] [blame] | 789 | if (!SkFontHost::ValidFontID(fRec.fFontID)) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 790 | return (FT_Error)-1; |
| 791 | } |
| 792 | |
| 793 | FT_Error err = FT_Activate_Size(fFTSize); |
| 794 | |
| 795 | if (err != 0) { |
| 796 | SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| 797 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 798 | fFTSize = NULL; |
| 799 | } else { |
| 800 | // seems we need to reset this every time (not sure why, but without it |
| 801 | // I get random italics from some other fFTSize) |
| 802 | FT_Set_Transform( fFace, &fMatrix22, NULL); |
| 803 | } |
| 804 | return err; |
| 805 | } |
| 806 | |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 807 | void SkScalerContext_FreeType::emboldenOutline(FT_Outline* outline) { |
| 808 | FT_Pos strength; |
| 809 | strength = FT_MulFix(fFace->units_per_EM, fFace->size->metrics.y_scale) |
| 810 | / 24; |
| 811 | FT_Outline_Embolden(outline, strength); |
| 812 | } |
| 813 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 814 | unsigned SkScalerContext_FreeType::generateGlyphCount() const { |
| 815 | return fFace->num_glyphs; |
| 816 | } |
| 817 | |
| 818 | uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { |
| 819 | return SkToU16(FT_Get_Char_Index( fFace, uni )); |
| 820 | } |
| 821 | |
reed@android.com | 9d3a985 | 2010-01-08 14:07:42 +0000 | [diff] [blame] | 822 | SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) { |
| 823 | // iterate through each cmap entry, looking for matching glyph indices |
| 824 | FT_UInt glyphIndex; |
| 825 | SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex ); |
| 826 | |
| 827 | while (glyphIndex != 0) { |
| 828 | if (glyphIndex == glyph) { |
| 829 | return charCode; |
| 830 | } |
| 831 | charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex ); |
| 832 | } |
| 833 | |
| 834 | return 0; |
| 835 | } |
| 836 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 837 | static FT_Pixel_Mode compute_pixel_mode(SkMask::Format format) { |
| 838 | switch (format) { |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 839 | case SkMask::kHorizontalLCD_Format: |
| 840 | case SkMask::kVerticalLCD_Format: |
| 841 | SkASSERT(!"An LCD format should never be passed here"); |
| 842 | return FT_PIXEL_MODE_GRAY; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 843 | case SkMask::kBW_Format: |
| 844 | return FT_PIXEL_MODE_MONO; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 845 | case SkMask::kA8_Format: |
| 846 | default: |
| 847 | return FT_PIXEL_MODE_GRAY; |
| 848 | } |
| 849 | } |
| 850 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 851 | void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { |
| 852 | #ifdef FT_ADVANCES_H |
| 853 | /* unhinted and light hinted text have linearly scaled advances |
| 854 | * which are very cheap to compute with some font formats... |
| 855 | */ |
| 856 | { |
| 857 | SkAutoMutexAcquire ac(gFTMutex); |
| 858 | |
| 859 | if (this->setupSize()) { |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 860 | glyph->zeroMetrics(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 861 | return; |
| 862 | } |
| 863 | |
| 864 | FT_Error error; |
| 865 | FT_Fixed advance; |
| 866 | |
| 867 | error = FT_Get_Advance( fFace, glyph->getGlyphID(fBaseGlyphCount), |
| 868 | fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, |
| 869 | &advance ); |
| 870 | if (0 == error) { |
| 871 | glyph->fRsbDelta = 0; |
| 872 | glyph->fLsbDelta = 0; |
| 873 | glyph->fAdvanceX = advance; // advance *2/3; //DEBUG |
| 874 | glyph->fAdvanceY = 0; |
| 875 | return; |
| 876 | } |
| 877 | } |
| 878 | #endif /* FT_ADVANCES_H */ |
| 879 | /* otherwise, we need to load/hint the glyph, which is slower */ |
| 880 | this->generateMetrics(glyph); |
| 881 | return; |
| 882 | } |
| 883 | |
| 884 | void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { |
| 885 | SkAutoMutexAcquire ac(gFTMutex); |
| 886 | |
| 887 | glyph->fRsbDelta = 0; |
| 888 | glyph->fLsbDelta = 0; |
| 889 | |
| 890 | FT_Error err; |
| 891 | |
| 892 | if (this->setupSize()) { |
| 893 | goto ERROR; |
| 894 | } |
| 895 | |
| 896 | err = FT_Load_Glyph( fFace, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags ); |
| 897 | if (err != 0) { |
| 898 | SkDEBUGF(("SkScalerContext_FreeType::generateMetrics(%x): FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| 899 | fFaceRec->fFontID, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, err)); |
| 900 | ERROR: |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 901 | glyph->zeroMetrics(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 902 | return; |
| 903 | } |
| 904 | |
| 905 | switch ( fFace->glyph->format ) { |
| 906 | case FT_GLYPH_FORMAT_OUTLINE: |
| 907 | FT_BBox bbox; |
| 908 | |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 909 | if (fRec.fFlags & kEmbolden_Flag) { |
| 910 | emboldenOutline(&fFace->glyph->outline); |
| 911 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 912 | FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox); |
| 913 | |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 914 | if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 915 | int dx = glyph->getSubXFixed() >> 10; |
| 916 | int dy = glyph->getSubYFixed() >> 10; |
| 917 | // negate dy since freetype-y-goes-up and skia-y-goes-down |
| 918 | bbox.xMin += dx; |
| 919 | bbox.yMin -= dy; |
| 920 | bbox.xMax += dx; |
| 921 | bbox.yMax -= dy; |
| 922 | } |
| 923 | |
| 924 | bbox.xMin &= ~63; |
| 925 | bbox.yMin &= ~63; |
| 926 | bbox.xMax = (bbox.xMax + 63) & ~63; |
| 927 | bbox.yMax = (bbox.yMax + 63) & ~63; |
| 928 | |
| 929 | glyph->fWidth = SkToU16((bbox.xMax - bbox.xMin) >> 6); |
| 930 | glyph->fHeight = SkToU16((bbox.yMax - bbox.yMin) >> 6); |
| 931 | glyph->fTop = -SkToS16(bbox.yMax >> 6); |
| 932 | glyph->fLeft = SkToS16(bbox.xMin >> 6); |
| 933 | break; |
| 934 | |
| 935 | case FT_GLYPH_FORMAT_BITMAP: |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 936 | if (fRec.fFlags & kEmbolden_Flag) { |
| 937 | FT_GlyphSlot_Own_Bitmap(fFace->glyph); |
| 938 | FT_Bitmap_Embolden(gFTLibrary, &fFace->glyph->bitmap, kBitmapEmboldenStrength, 0); |
| 939 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 940 | glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); |
| 941 | glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); |
| 942 | glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); |
| 943 | glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); |
| 944 | break; |
| 945 | |
| 946 | default: |
| 947 | SkASSERT(!"unknown glyph format"); |
| 948 | goto ERROR; |
| 949 | } |
| 950 | |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 951 | if ((fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 952 | glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); |
| 953 | glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); |
| 954 | if (fRec.fFlags & kDevKernText_Flag) { |
| 955 | glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); |
| 956 | glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); |
| 957 | } |
| 958 | } else { |
| 959 | glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdvance); |
| 960 | glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdvance); |
| 961 | } |
| 962 | |
| 963 | #ifdef ENABLE_GLYPH_SPEW |
| 964 | SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); |
| 965 | SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, glyph->fWidth)); |
| 966 | #endif |
| 967 | } |
| 968 | |
reed@android.com | f549369 | 2009-07-22 19:21:01 +0000 | [diff] [blame] | 969 | #if defined(SK_SUPPORT_LCDTEXT) |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 970 | namespace skia_freetype_support { |
| 971 | // extern functions from SkFontHost_FreeType_Subpixel |
| 972 | extern void CopyFreetypeBitmapToLCDMask(const SkGlyph& dest, const FT_Bitmap& source); |
| 973 | extern void CopyFreetypeBitmapToVerticalLCDMask(const SkGlyph& dest, const FT_Bitmap& source); |
| 974 | } |
| 975 | |
| 976 | using namespace skia_freetype_support; |
| 977 | #endif |
| 978 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 979 | void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { |
| 980 | SkAutoMutexAcquire ac(gFTMutex); |
| 981 | |
| 982 | FT_Error err; |
| 983 | |
| 984 | if (this->setupSize()) { |
| 985 | goto ERROR; |
| 986 | } |
| 987 | |
| 988 | err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags); |
| 989 | if (err != 0) { |
| 990 | SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", |
| 991 | glyph.getGlyphID(fBaseGlyphCount), glyph.fWidth, glyph.fHeight, glyph.rowBytes(), fLoadGlyphFlags, err)); |
| 992 | ERROR: |
| 993 | memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| 994 | return; |
| 995 | } |
| 996 | |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 997 | const bool lcdRenderMode = fRec.fMaskFormat == SkMask::kHorizontalLCD_Format || |
| 998 | fRec.fMaskFormat == SkMask::kVerticalLCD_Format; |
| 999 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1000 | switch ( fFace->glyph->format ) { |
| 1001 | case FT_GLYPH_FORMAT_OUTLINE: { |
| 1002 | FT_Outline* outline = &fFace->glyph->outline; |
| 1003 | FT_BBox bbox; |
| 1004 | FT_Bitmap target; |
| 1005 | |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 1006 | if (fRec.fFlags & kEmbolden_Flag) { |
| 1007 | emboldenOutline(outline); |
| 1008 | } |
| 1009 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1010 | int dx = 0, dy = 0; |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 1011 | if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1012 | dx = glyph.getSubXFixed() >> 10; |
| 1013 | dy = glyph.getSubYFixed() >> 10; |
| 1014 | // negate dy since freetype-y-goes-up and skia-y-goes-down |
| 1015 | dy = -dy; |
| 1016 | } |
| 1017 | FT_Outline_Get_CBox(outline, &bbox); |
| 1018 | /* |
| 1019 | what we really want to do for subpixel is |
| 1020 | offset(dx, dy) |
| 1021 | compute_bounds |
| 1022 | offset(bbox & !63) |
| 1023 | but that is two calls to offset, so we do the following, which |
| 1024 | achieves the same thing with only one offset call. |
| 1025 | */ |
| 1026 | FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63), |
| 1027 | dy - ((bbox.yMin + dy) & ~63)); |
| 1028 | |
reed@android.com | f549369 | 2009-07-22 19:21:01 +0000 | [diff] [blame] | 1029 | #if defined(SK_SUPPORT_LCDTEXT) |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 1030 | if (lcdRenderMode) { |
| 1031 | // FT_Outline_Get_Bitmap cannot render LCD glyphs. In this case |
| 1032 | // we have to call FT_Render_Glyph and memcpy the image out. |
| 1033 | const bool isVertical = fRec.fMaskFormat == SkMask::kVerticalLCD_Format; |
| 1034 | FT_Render_Mode mode = isVertical ? FT_RENDER_MODE_LCD_V : FT_RENDER_MODE_LCD; |
| 1035 | FT_Render_Glyph(fFace->glyph, mode); |
| 1036 | |
| 1037 | if (isVertical) |
| 1038 | CopyFreetypeBitmapToVerticalLCDMask(glyph, fFace->glyph->bitmap); |
| 1039 | else |
| 1040 | CopyFreetypeBitmapToLCDMask(glyph, fFace->glyph->bitmap); |
| 1041 | |
| 1042 | break; |
| 1043 | } |
| 1044 | #endif |
| 1045 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1046 | target.width = glyph.fWidth; |
| 1047 | target.rows = glyph.fHeight; |
| 1048 | target.pitch = glyph.rowBytes(); |
| 1049 | target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage); |
| 1050 | target.pixel_mode = compute_pixel_mode( |
| 1051 | (SkMask::Format)fRec.fMaskFormat); |
| 1052 | target.num_grays = 256; |
| 1053 | |
| 1054 | memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| 1055 | FT_Outline_Get_Bitmap(gFTLibrary, outline, &target); |
| 1056 | } break; |
| 1057 | |
| 1058 | case FT_GLYPH_FORMAT_BITMAP: { |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 1059 | if (fRec.fFlags & kEmbolden_Flag) { |
| 1060 | FT_GlyphSlot_Own_Bitmap(fFace->glyph); |
| 1061 | FT_Bitmap_Embolden(gFTLibrary, &fFace->glyph->bitmap, kBitmapEmboldenStrength, 0); |
| 1062 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1063 | SkASSERT_CONTINUE(glyph.fWidth == fFace->glyph->bitmap.width); |
| 1064 | SkASSERT_CONTINUE(glyph.fHeight == fFace->glyph->bitmap.rows); |
| 1065 | SkASSERT_CONTINUE(glyph.fTop == -fFace->glyph->bitmap_top); |
| 1066 | SkASSERT_CONTINUE(glyph.fLeft == fFace->glyph->bitmap_left); |
| 1067 | |
| 1068 | const uint8_t* src = (const uint8_t*)fFace->glyph->bitmap.buffer; |
| 1069 | uint8_t* dst = (uint8_t*)glyph.fImage; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1070 | |
agl@chromium.org | 558434a | 2009-08-11 17:22:38 +0000 | [diff] [blame] | 1071 | if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY || |
| 1072 | (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO && |
| 1073 | glyph.fMaskFormat == SkMask::kBW_Format)) { |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1074 | unsigned srcRowBytes = fFace->glyph->bitmap.pitch; |
| 1075 | unsigned dstRowBytes = glyph.rowBytes(); |
| 1076 | unsigned minRowBytes = SkMin32(srcRowBytes, dstRowBytes); |
| 1077 | unsigned extraRowBytes = dstRowBytes - minRowBytes; |
| 1078 | |
| 1079 | for (int y = fFace->glyph->bitmap.rows - 1; y >= 0; --y) { |
| 1080 | memcpy(dst, src, minRowBytes); |
| 1081 | memset(dst + minRowBytes, 0, extraRowBytes); |
| 1082 | src += srcRowBytes; |
| 1083 | dst += dstRowBytes; |
| 1084 | } |
agl@chromium.org | 558434a | 2009-08-11 17:22:38 +0000 | [diff] [blame] | 1085 | } else if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO && |
agl@chromium.org | e95c91e | 2010-01-04 18:27:55 +0000 | [diff] [blame] | 1086 | (glyph.fMaskFormat == SkMask::kA8_Format || |
| 1087 | glyph.fMaskFormat == SkMask::kHorizontalLCD_Format || |
| 1088 | glyph.fMaskFormat == SkMask::kVerticalLCD_Format)) { |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1089 | for (int y = 0; y < fFace->glyph->bitmap.rows; ++y) { |
| 1090 | uint8_t byte = 0; |
| 1091 | int bits = 0; |
| 1092 | const uint8_t* src_row = src; |
| 1093 | uint8_t* dst_row = dst; |
| 1094 | |
| 1095 | for (int x = 0; x < fFace->glyph->bitmap.width; ++x) { |
| 1096 | if (!bits) { |
| 1097 | byte = *src_row++; |
| 1098 | bits = 8; |
| 1099 | } |
| 1100 | |
| 1101 | *dst_row++ = byte & 0x80 ? 0xff : 0; |
| 1102 | bits--; |
| 1103 | byte <<= 1; |
| 1104 | } |
| 1105 | |
| 1106 | src += fFace->glyph->bitmap.pitch; |
| 1107 | dst += glyph.rowBytes(); |
| 1108 | } |
agl@chromium.org | 558434a | 2009-08-11 17:22:38 +0000 | [diff] [blame] | 1109 | } else { |
| 1110 | SkASSERT(!"unknown glyph bitmap transform needed"); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1111 | } |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 1112 | |
| 1113 | if (lcdRenderMode) |
| 1114 | glyph.expandA8ToLCD(); |
| 1115 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1116 | } break; |
| 1117 | |
| 1118 | default: |
| 1119 | SkASSERT(!"unknown glyph format"); |
| 1120 | goto ERROR; |
| 1121 | } |
| 1122 | } |
| 1123 | |
| 1124 | /////////////////////////////////////////////////////////////////////////////// |
| 1125 | |
| 1126 | #define ft2sk(x) SkFixedToScalar((x) << 10) |
| 1127 | |
reed@android.com | 6f25297 | 2009-01-14 16:46:16 +0000 | [diff] [blame] | 1128 | #if FREETYPE_MAJOR >= 2 && FREETYPE_MINOR >= 2 |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1129 | #define CONST_PARAM const |
| 1130 | #else // older freetype doesn't use const here |
| 1131 | #define CONST_PARAM |
| 1132 | #endif |
| 1133 | |
| 1134 | static int move_proc(CONST_PARAM FT_Vector* pt, void* ctx) { |
| 1135 | SkPath* path = (SkPath*)ctx; |
| 1136 | path->close(); // to close the previous contour (if any) |
| 1137 | path->moveTo(ft2sk(pt->x), -ft2sk(pt->y)); |
| 1138 | return 0; |
| 1139 | } |
| 1140 | |
| 1141 | static int line_proc(CONST_PARAM FT_Vector* pt, void* ctx) { |
| 1142 | SkPath* path = (SkPath*)ctx; |
| 1143 | path->lineTo(ft2sk(pt->x), -ft2sk(pt->y)); |
| 1144 | return 0; |
| 1145 | } |
| 1146 | |
| 1147 | static int quad_proc(CONST_PARAM FT_Vector* pt0, CONST_PARAM FT_Vector* pt1, |
| 1148 | void* ctx) { |
| 1149 | SkPath* path = (SkPath*)ctx; |
| 1150 | path->quadTo(ft2sk(pt0->x), -ft2sk(pt0->y), ft2sk(pt1->x), -ft2sk(pt1->y)); |
| 1151 | return 0; |
| 1152 | } |
| 1153 | |
| 1154 | static int cubic_proc(CONST_PARAM FT_Vector* pt0, CONST_PARAM FT_Vector* pt1, |
| 1155 | CONST_PARAM FT_Vector* pt2, void* ctx) { |
| 1156 | SkPath* path = (SkPath*)ctx; |
| 1157 | path->cubicTo(ft2sk(pt0->x), -ft2sk(pt0->y), ft2sk(pt1->x), |
| 1158 | -ft2sk(pt1->y), ft2sk(pt2->x), -ft2sk(pt2->y)); |
| 1159 | return 0; |
| 1160 | } |
| 1161 | |
| 1162 | void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, |
| 1163 | SkPath* path) { |
| 1164 | SkAutoMutexAcquire ac(gFTMutex); |
| 1165 | |
| 1166 | SkASSERT(&glyph && path); |
| 1167 | |
| 1168 | if (this->setupSize()) { |
| 1169 | path->reset(); |
| 1170 | return; |
| 1171 | } |
| 1172 | |
| 1173 | uint32_t flags = fLoadGlyphFlags; |
| 1174 | flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline |
| 1175 | flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) |
| 1176 | |
| 1177 | FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), flags); |
| 1178 | |
| 1179 | if (err != 0) { |
| 1180 | SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| 1181 | glyph.getGlyphID(fBaseGlyphCount), flags, err)); |
| 1182 | path->reset(); |
| 1183 | return; |
| 1184 | } |
| 1185 | |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 1186 | if (fRec.fFlags & kEmbolden_Flag) { |
| 1187 | emboldenOutline(&fFace->glyph->outline); |
| 1188 | } |
| 1189 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1190 | FT_Outline_Funcs funcs; |
| 1191 | |
| 1192 | funcs.move_to = move_proc; |
| 1193 | funcs.line_to = line_proc; |
| 1194 | funcs.conic_to = quad_proc; |
| 1195 | funcs.cubic_to = cubic_proc; |
| 1196 | funcs.shift = 0; |
| 1197 | funcs.delta = 0; |
| 1198 | |
| 1199 | err = FT_Outline_Decompose(&fFace->glyph->outline, &funcs, path); |
| 1200 | |
| 1201 | if (err != 0) { |
| 1202 | SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| 1203 | glyph.getGlyphID(fBaseGlyphCount), flags, err)); |
| 1204 | path->reset(); |
| 1205 | return; |
| 1206 | } |
| 1207 | |
| 1208 | path->close(); |
| 1209 | } |
| 1210 | |
| 1211 | void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* mx, |
| 1212 | SkPaint::FontMetrics* my) { |
| 1213 | if (NULL == mx && NULL == my) { |
| 1214 | return; |
| 1215 | } |
| 1216 | |
| 1217 | SkAutoMutexAcquire ac(gFTMutex); |
| 1218 | |
| 1219 | if (this->setupSize()) { |
reed@android.com | a8a8b8b | 2009-05-04 15:00:11 +0000 | [diff] [blame] | 1220 | ERROR: |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1221 | if (mx) { |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 1222 | sk_bzero(mx, sizeof(SkPaint::FontMetrics)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1223 | } |
| 1224 | if (my) { |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 1225 | sk_bzero(my, sizeof(SkPaint::FontMetrics)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1226 | } |
| 1227 | return; |
| 1228 | } |
| 1229 | |
reed@android.com | a8a8b8b | 2009-05-04 15:00:11 +0000 | [diff] [blame] | 1230 | FT_Face face = fFace; |
| 1231 | int upem = face->units_per_EM; |
| 1232 | if (upem <= 0) { |
| 1233 | goto ERROR; |
| 1234 | } |
| 1235 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1236 | SkPoint pts[6]; |
| 1237 | SkFixed ys[6]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1238 | SkFixed scaleY = fScaleY; |
| 1239 | SkFixed mxy = fMatrix22.xy; |
| 1240 | SkFixed myy = fMatrix22.yy; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1241 | SkScalar xmin = SkIntToScalar(face->bbox.xMin) / upem; |
| 1242 | SkScalar xmax = SkIntToScalar(face->bbox.xMax) / upem; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1243 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1244 | int leading = face->height - (face->ascender + -face->descender); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1245 | if (leading < 0) { |
| 1246 | leading = 0; |
| 1247 | } |
| 1248 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1249 | // Try to get the OS/2 table from the font. This contains the specific |
| 1250 | // average font width metrics which Windows uses. |
| 1251 | TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); |
| 1252 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1253 | ys[0] = -face->bbox.yMax; |
| 1254 | ys[1] = -face->ascender; |
| 1255 | ys[2] = -face->descender; |
| 1256 | ys[3] = -face->bbox.yMin; |
| 1257 | ys[4] = leading; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1258 | ys[5] = os2 ? os2->xAvgCharWidth : 0; |
| 1259 | |
| 1260 | SkScalar x_height; |
| 1261 | if (os2 && os2->sxHeight) { |
| 1262 | x_height = SkFixedToScalar(SkMulDiv(fScaleX, os2->sxHeight, upem)); |
| 1263 | } else { |
| 1264 | const FT_UInt x_glyph = FT_Get_Char_Index(fFace, 'x'); |
| 1265 | if (x_glyph) { |
| 1266 | FT_BBox bbox; |
| 1267 | FT_Load_Glyph(fFace, x_glyph, fLoadGlyphFlags); |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 1268 | if (fRec.fFlags & kEmbolden_Flag) { |
| 1269 | emboldenOutline(&fFace->glyph->outline); |
| 1270 | } |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1271 | FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox); |
| 1272 | x_height = SkIntToScalar(bbox.yMax) / 64; |
| 1273 | } else { |
| 1274 | x_height = 0; |
| 1275 | } |
| 1276 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1277 | |
| 1278 | // convert upem-y values into scalar points |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1279 | for (int i = 0; i < 6; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1280 | SkFixed y = SkMulDiv(scaleY, ys[i], upem); |
| 1281 | SkFixed x = SkFixedMul(mxy, y); |
| 1282 | y = SkFixedMul(myy, y); |
| 1283 | pts[i].set(SkFixedToScalar(x), SkFixedToScalar(y)); |
| 1284 | } |
| 1285 | |
| 1286 | if (mx) { |
| 1287 | mx->fTop = pts[0].fX; |
| 1288 | mx->fAscent = pts[1].fX; |
| 1289 | mx->fDescent = pts[2].fX; |
| 1290 | mx->fBottom = pts[3].fX; |
| 1291 | mx->fLeading = pts[4].fX; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1292 | mx->fAvgCharWidth = pts[5].fX; |
| 1293 | mx->fXMin = xmin; |
| 1294 | mx->fXMax = xmax; |
| 1295 | mx->fXHeight = x_height; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1296 | } |
| 1297 | if (my) { |
| 1298 | my->fTop = pts[0].fY; |
| 1299 | my->fAscent = pts[1].fY; |
| 1300 | my->fDescent = pts[2].fY; |
| 1301 | my->fBottom = pts[3].fY; |
| 1302 | my->fLeading = pts[4].fY; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1303 | my->fAvgCharWidth = pts[5].fY; |
| 1304 | my->fXMin = xmin; |
| 1305 | my->fXMax = xmax; |
| 1306 | my->fXHeight = x_height; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | //////////////////////////////////////////////////////////////////////// |
| 1311 | //////////////////////////////////////////////////////////////////////// |
| 1312 | |
| 1313 | SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) { |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 1314 | SkScalerContext_FreeType* c = SkNEW_ARGS(SkScalerContext_FreeType, (desc)); |
| 1315 | if (!c->success()) { |
| 1316 | SkDELETE(c); |
| 1317 | c = NULL; |
| 1318 | } |
| 1319 | return c; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1320 | } |
| 1321 | |
| 1322 | /////////////////////////////////////////////////////////////////////////////// |
| 1323 | |
| 1324 | /* Export this so that other parts of our FonttHost port can make use of our |
| 1325 | ability to extract the name+style from a stream, using FreeType's api. |
| 1326 | */ |
| 1327 | SkTypeface::Style find_name_and_style(SkStream* stream, SkString* name) { |
| 1328 | FT_Library library; |
reed@android.com | bfbd4ff | 2009-07-23 17:44:41 +0000 | [diff] [blame] | 1329 | if (FT_Init_FreeType(&library)) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1330 | name->set(NULL); |
| 1331 | return SkTypeface::kNormal; |
| 1332 | } |
| 1333 | |
| 1334 | FT_Open_Args args; |
| 1335 | memset(&args, 0, sizeof(args)); |
| 1336 | |
| 1337 | const void* memoryBase = stream->getMemoryBase(); |
| 1338 | FT_StreamRec streamRec; |
| 1339 | |
| 1340 | if (NULL != memoryBase) { |
| 1341 | args.flags = FT_OPEN_MEMORY; |
| 1342 | args.memory_base = (const FT_Byte*)memoryBase; |
| 1343 | args.memory_size = stream->getLength(); |
| 1344 | } else { |
| 1345 | memset(&streamRec, 0, sizeof(streamRec)); |
| 1346 | streamRec.size = stream->read(NULL, 0); |
| 1347 | streamRec.descriptor.pointer = stream; |
| 1348 | streamRec.read = sk_stream_read; |
| 1349 | streamRec.close = sk_stream_close; |
| 1350 | |
| 1351 | args.flags = FT_OPEN_STREAM; |
| 1352 | args.stream = &streamRec; |
| 1353 | } |
| 1354 | |
| 1355 | FT_Face face; |
| 1356 | if (FT_Open_Face(library, &args, 0, &face)) { |
| 1357 | FT_Done_FreeType(library); |
| 1358 | name->set(NULL); |
| 1359 | return SkTypeface::kNormal; |
| 1360 | } |
| 1361 | |
| 1362 | name->set(face->family_name); |
| 1363 | int style = SkTypeface::kNormal; |
| 1364 | |
| 1365 | if (face->style_flags & FT_STYLE_FLAG_BOLD) { |
| 1366 | style |= SkTypeface::kBold; |
| 1367 | } |
| 1368 | if (face->style_flags & FT_STYLE_FLAG_ITALIC) { |
| 1369 | style |= SkTypeface::kItalic; |
| 1370 | } |
| 1371 | |
| 1372 | FT_Done_Face(face); |
| 1373 | FT_Done_FreeType(library); |
| 1374 | return (SkTypeface::Style)style; |
| 1375 | } |