reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/ports/SkFontHost_android.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 | |
| 18 | #include "SkFontHost.h" |
| 19 | #include "SkDescriptor.h" |
| 20 | #include "SkString.h" |
| 21 | #include "SkStream.h" |
| 22 | #include <stdio.h> |
| 23 | |
| 24 | /* define this if we can use mmap() to access fonts from the filesystem */ |
| 25 | #define SK_CAN_USE_MMAP |
| 26 | |
| 27 | #ifndef SK_FONTPATH |
| 28 | #define SK_FONTPATH "the complete path for a font file" |
| 29 | #endif |
| 30 | |
| 31 | struct FontFaceRec { |
| 32 | const char* fFileName; |
| 33 | uint8_t fFamilyIndex; |
| 34 | SkBool8 fBold; |
| 35 | SkBool8 fItalic; |
| 36 | |
| 37 | static const FontFaceRec& FindFace(const FontFaceRec rec[], int count, int isBold, int isItalic); |
| 38 | }; |
| 39 | |
| 40 | struct FontFamilyRec { |
| 41 | const FontFaceRec* fFaces; |
| 42 | int fFaceCount; |
| 43 | }; |
| 44 | |
| 45 | const FontFaceRec& FontFaceRec::FindFace(const FontFaceRec rec[], int count, int isBold, int isItalic) |
| 46 | { |
| 47 | SkASSERT(count > 0); |
| 48 | |
| 49 | int i; |
| 50 | |
| 51 | // look for an exact match |
| 52 | for (i = 0; i < count; i++) { |
| 53 | if (rec[i].fBold == isBold && rec[i].fItalic == isItalic) |
| 54 | return rec[i]; |
| 55 | } |
| 56 | // look for a match in the bold field |
| 57 | for (i = 0; i < count; i++) { |
| 58 | if (rec[i].fBold == isBold) |
| 59 | return rec[i]; |
| 60 | } |
| 61 | // look for a normal/regular face |
| 62 | for (i = 0; i < count; i++) { |
| 63 | if (!rec[i].fBold && !rec[i].fItalic) |
| 64 | return rec[i]; |
| 65 | } |
| 66 | // give up |
| 67 | return rec[0]; |
| 68 | } |
| 69 | |
| 70 | enum { |
| 71 | DEFAULT_FAMILY_INDEX, |
| 72 | |
| 73 | FAMILY_INDEX_COUNT |
| 74 | }; |
| 75 | |
| 76 | static const FontFaceRec gDefaultFaces[] = { |
| 77 | { SK_FONTPATH, DEFAULT_FAMILY_INDEX, 0, 0 } |
| 78 | }; |
| 79 | |
| 80 | // This table must be in the same order as the ..._FAMILY_INDEX enum specifies |
| 81 | static const FontFamilyRec gFamilies[] = { |
| 82 | { gDefaultFaces, SK_ARRAY_COUNT(gDefaultFaces) } |
| 83 | }; |
| 84 | |
| 85 | #define DEFAULT_FAMILY_INDEX DEFAULT_FAMILY_INDEX |
| 86 | #define DEFAULT_FAMILY_FACE_INDEX 0 |
| 87 | |
| 88 | //////////////////////////////////////////////////////////////////////////////////////// |
| 89 | |
| 90 | /* map common "web" font names to our font list */ |
| 91 | |
| 92 | struct FontFamilyMatchRec { |
| 93 | const char* fLCName; |
| 94 | int fFamilyIndex; |
| 95 | }; |
| 96 | |
| 97 | /* This is a table of synonyms for collapsing font names |
| 98 | down to their pseudo-equivalents (i.e. in terms of fonts |
| 99 | we actually have.) |
| 100 | Keep this sorted by the first field so we can do a binary search. |
| 101 | If this gets big, we could switch to a hash... |
| 102 | */ |
| 103 | static const FontFamilyMatchRec gMatches[] = { |
| 104 | #if 0 |
| 105 | { "Ahem", Ahem_FAMILY_INDEX }, |
| 106 | { "arial", SANS_FAMILY_INDEX }, |
| 107 | { "courier", MONO_FAMILY_INDEX }, |
| 108 | { "courier new", MONO_FAMILY_INDEX }, |
| 109 | { "cursive", SERIF_FAMILY_INDEX }, |
| 110 | { "fantasy", SERIF_FAMILY_INDEX }, |
| 111 | { "georgia", SERIF_FAMILY_INDEX }, |
| 112 | { "goudy", SERIF_FAMILY_INDEX }, |
| 113 | { "helvetica", SANS_FAMILY_INDEX }, |
| 114 | { "palatino", SERIF_FAMILY_INDEX }, |
| 115 | { "tahoma", SANS_FAMILY_INDEX }, |
| 116 | { "sans-serif", SANS_FAMILY_INDEX }, |
| 117 | { "serif", SERIF_FAMILY_INDEX }, |
| 118 | { "times", SERIF_FAMILY_INDEX }, |
| 119 | { "times new roman", SERIF_FAMILY_INDEX }, |
| 120 | { "verdana", SANS_FAMILY_INDEX } |
| 121 | #endif |
| 122 | }; |
| 123 | |
| 124 | //////////////////////////////////////////////////////////////////////////////////////// |
| 125 | |
| 126 | #include "SkTSearch.h" |
| 127 | |
| 128 | static bool contains_only_ascii(const char s[]) |
| 129 | { |
| 130 | for (;;) |
| 131 | { |
| 132 | int c = *s++; |
| 133 | if (c == 0) |
| 134 | break; |
| 135 | if ((c >> 7) != 0) |
| 136 | return false; |
| 137 | } |
| 138 | return true; |
| 139 | } |
| 140 | |
| 141 | #define TRACE_FONT_NAME(code) |
| 142 | //#define TRACE_FONT_NAME(code) code |
| 143 | |
| 144 | const FontFamilyRec* find_family_rec(const char target[]) |
| 145 | { |
| 146 | int index; |
| 147 | |
| 148 | // If we're asked for a font name that contains non-ascii, |
| 149 | // 1) SkStrLCSearch can't handle it |
| 150 | // 2) All of our fonts are have ascii names, so... |
| 151 | |
| 152 | TRACE_FONT_NAME(printf("----------------- font request <%s>", target);) |
| 153 | |
| 154 | if (contains_only_ascii(target)) |
| 155 | { |
| 156 | // Search for the font by matching the entire name |
| 157 | index = SkStrLCSearch(&gMatches[0].fLCName, SK_ARRAY_COUNT(gMatches), target, sizeof(gMatches[0])); |
| 158 | if (index >= 0) |
| 159 | { |
| 160 | TRACE_FONT_NAME(printf(" found %d\n", index);) |
| 161 | return &gFamilies[gMatches[index].fFamilyIndex]; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | // Sniff for key words... |
| 166 | |
| 167 | #if 0 |
| 168 | if (strstr(target, "sans") || strstr(target, "Sans")) |
| 169 | { |
| 170 | TRACE_FONT_NAME(printf(" found sans\n");) |
| 171 | return &gFamilies[SANS_FAMILY_INDEX]; |
| 172 | } |
| 173 | if (strstr(target, "serif") || strstr(target, "Serif")) |
| 174 | { |
| 175 | TRACE_FONT_NAME(printf(" found serif\n");) |
| 176 | return &gFamilies[SERIF_FAMILY_INDEX]; |
| 177 | } |
| 178 | if (strstr(target, "mono") || strstr(target, "Mono")) |
| 179 | { |
| 180 | TRACE_FONT_NAME(printf(" found mono\n");) |
| 181 | return &gFamilies[MONO_FAMILY_INDEX]; |
| 182 | } |
| 183 | #endif |
| 184 | |
| 185 | TRACE_FONT_NAME(printf(" use default\n");) |
| 186 | // we give up, just give them the default font |
| 187 | return &gFamilies[DEFAULT_FAMILY_INDEX]; |
| 188 | } |
| 189 | |
| 190 | /////////////////////////////////////////////////////////////////////////////////////////////// |
| 191 | |
| 192 | static const FontFaceRec* get_default_face() |
| 193 | { |
| 194 | return &gFamilies[DEFAULT_FAMILY_INDEX].fFaces[DEFAULT_FAMILY_FACE_INDEX]; |
| 195 | } |
| 196 | |
| 197 | class FontFaceRec_Typeface : public SkTypeface { |
| 198 | public: |
| 199 | FontFaceRec_Typeface(const FontFaceRec& face) : fFace(face) |
| 200 | { |
| 201 | int style = 0; |
| 202 | if (face.fBold) |
| 203 | style |= SkTypeface::kBold; |
| 204 | if (face.fItalic) |
| 205 | style |= SkTypeface::kItalic; |
| 206 | this->setStyle((SkTypeface::Style)style); |
| 207 | } |
| 208 | |
| 209 | // This global const reference completely identifies the face |
| 210 | const FontFaceRec& fFace; |
| 211 | }; |
| 212 | |
| 213 | static const FontFaceRec* get_typeface_rec(const SkTypeface* face) |
| 214 | { |
| 215 | const FontFaceRec_Typeface* f = (FontFaceRec_Typeface*)face; |
| 216 | return f ? &f->fFace : get_default_face(); |
| 217 | } |
| 218 | |
| 219 | static uint32_t ptr2uint32(const void* p) |
| 220 | { |
| 221 | // cast so we avoid warnings on 64bit machines that a ptr difference |
| 222 | // which might be 64bits is being trucated from 64 to 32 |
| 223 | return (uint32_t)((char*)p - (char*)0); |
| 224 | } |
| 225 | |
| 226 | uint32_t SkFontHost::TypefaceHash(const SkTypeface* face) |
| 227 | { |
| 228 | // just use our address as the hash value |
| 229 | return ptr2uint32(get_typeface_rec(face)); |
| 230 | } |
| 231 | |
| 232 | bool SkFontHost::TypefaceEqual(const SkTypeface* facea, const SkTypeface* faceb) |
| 233 | { |
| 234 | return get_typeface_rec(facea) == get_typeface_rec(faceb); |
| 235 | } |
| 236 | |
| 237 | SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace, const char familyName[], SkTypeface::Style style) |
| 238 | { |
| 239 | const FontFamilyRec* family; |
| 240 | |
| 241 | if (familyFace) |
| 242 | family = &gFamilies[((FontFaceRec_Typeface*)familyFace)->fFace.fFamilyIndex]; |
| 243 | else if (familyName) |
| 244 | family = find_family_rec(familyName); |
| 245 | else |
| 246 | family = &gFamilies[DEFAULT_FAMILY_INDEX]; |
| 247 | |
| 248 | const FontFaceRec& face = FontFaceRec::FindFace(family->fFaces, family->fFaceCount, |
| 249 | (style & SkTypeface::kBold) != 0, |
| 250 | (style & SkTypeface::kItalic) != 0); |
| 251 | |
| 252 | // if we're returning our input parameter, no need to create a new instance |
| 253 | if (familyFace != NULL && &((FontFaceRec_Typeface*)familyFace)->fFace == &face) |
| 254 | { |
| 255 | familyFace->ref(); |
| 256 | return (SkTypeface*)familyFace; |
| 257 | } |
| 258 | return SkNEW_ARGS(FontFaceRec_Typeface, (face)); |
| 259 | } |
| 260 | |
| 261 | uint32_t SkFontHost::FlattenTypeface(const SkTypeface* tface, void* buffer) |
| 262 | { |
| 263 | const FontFaceRec* face; |
| 264 | |
| 265 | if (tface) |
| 266 | face = &((const FontFaceRec_Typeface*)tface)->fFace; |
| 267 | else |
| 268 | face = get_default_face(); |
| 269 | |
| 270 | size_t size = sizeof(face); |
| 271 | if (buffer) |
| 272 | memcpy(buffer, &face, size); |
| 273 | return size; |
| 274 | } |
| 275 | |
| 276 | void SkFontHost::GetDescriptorKeyString(const SkDescriptor* desc, SkString* key) |
| 277 | { |
| 278 | key->set(SK_FONTPATH); |
| 279 | } |
| 280 | |
| 281 | #ifdef SK_CAN_USE_MMAP |
| 282 | #include <unistd.h> |
| 283 | #include <sys/mman.h> |
| 284 | #include <fcntl.h> |
| 285 | #include <errno.h> |
| 286 | |
| 287 | class SkMMAPStream : public SkMemoryStream { |
| 288 | public: |
| 289 | SkMMAPStream(const char filename[]); |
| 290 | virtual ~SkMMAPStream(); |
| 291 | |
| 292 | virtual void setMemory(const void* data, size_t length); |
| 293 | private: |
| 294 | int fFildes; |
| 295 | void* fAddr; |
| 296 | size_t fSize; |
| 297 | |
| 298 | void closeMMap(); |
| 299 | |
| 300 | typedef SkMemoryStream INHERITED; |
| 301 | }; |
| 302 | |
| 303 | SkMMAPStream::SkMMAPStream(const char filename[]) |
| 304 | { |
| 305 | fFildes = -1; // initialize to failure case |
| 306 | |
| 307 | int fildes = open(filename, O_RDONLY); |
| 308 | if (fildes < 0) |
| 309 | { |
| 310 | SkDEBUGF(("---- failed to open(%s) for mmap stream error=%d\n", filename, errno)); |
| 311 | return; |
| 312 | } |
| 313 | |
| 314 | off_t size = lseek(fildes, 0, SEEK_END); // find the file size |
| 315 | if (size == -1) |
| 316 | { |
| 317 | SkDEBUGF(("---- failed to lseek(%s) for mmap stream error=%d\n", filename, errno)); |
| 318 | close(fildes); |
| 319 | return; |
| 320 | } |
| 321 | (void)lseek(fildes, 0, SEEK_SET); // restore file offset to beginning |
| 322 | |
| 323 | void* addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fildes, 0); |
| 324 | if (MAP_FAILED == addr) |
| 325 | { |
| 326 | SkDEBUGF(("---- failed to mmap(%s) for mmap stream error=%d\n", filename, errno)); |
| 327 | close(fildes); |
| 328 | return; |
| 329 | } |
| 330 | |
| 331 | this->INHERITED::setMemory(addr, size); |
| 332 | |
| 333 | fFildes = fildes; |
| 334 | fAddr = addr; |
| 335 | fSize = size; |
| 336 | } |
| 337 | |
| 338 | SkMMAPStream::~SkMMAPStream() |
| 339 | { |
| 340 | this->closeMMap(); |
| 341 | } |
| 342 | |
| 343 | void SkMMAPStream::setMemory(const void* data, size_t length) |
| 344 | { |
| 345 | this->closeMMap(); |
| 346 | this->INHERITED::setMemory(data, length); |
| 347 | } |
| 348 | |
| 349 | void SkMMAPStream::closeMMap() |
| 350 | { |
| 351 | if (fFildes >= 0) |
| 352 | { |
| 353 | munmap(fAddr, fSize); |
| 354 | close(fFildes); |
| 355 | fFildes = -1; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | #endif |
| 360 | |
| 361 | SkStream* SkFontHost::OpenDescriptorStream(const SkDescriptor* desc, const char keyString[]) |
| 362 | { |
| 363 | // our key string IS our filename, so we can ignore desc |
| 364 | SkStream* strm; |
| 365 | |
| 366 | #ifdef SK_CAN_USE_MMAP |
| 367 | strm = new SkMMAPStream(keyString); |
| 368 | if (strm->getLength() > 0) |
| 369 | return strm; |
| 370 | |
| 371 | // strm not valid |
| 372 | delete strm; |
| 373 | // fall through to FILEStream attempt |
| 374 | #endif |
| 375 | |
| 376 | strm = new SkFILEStream(keyString); |
| 377 | if (strm->getLength() > 0) |
| 378 | return strm; |
| 379 | |
| 380 | // strm not valid |
| 381 | delete strm; |
| 382 | return NULL; |
| 383 | } |
| 384 | |
| 385 | SkScalerContext* SkFontHost::CreateFallbackScalerContext(const SkScalerContext::Rec& rec) |
| 386 | { |
| 387 | const FontFaceRec* face = get_default_face(); |
| 388 | |
| 389 | SkAutoDescriptor ad(sizeof(rec) + sizeof(face) + SkDescriptor::ComputeOverhead(2)); |
| 390 | SkDescriptor* desc = ad.getDesc(); |
| 391 | |
| 392 | desc->init(); |
| 393 | desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); |
| 394 | desc->addEntry(kTypeface_SkDescriptorTag, sizeof(face), &face); |
| 395 | desc->computeChecksum(); |
| 396 | |
| 397 | return SkFontHost::CreateScalerContext(desc); |
| 398 | } |
| 399 | |
| 400 | size_t SkFontHost::ShouldPurgeFontCache(size_t sizeAllocatedSoFar) |
| 401 | { |
| 402 | return 0; // nothing to do (change me if you want to limit the font cache) |
| 403 | } |
| 404 | |
| 405 | int SkFontHost::ComputeGammaFlag(const SkPaint& paint) |
| 406 | { |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | void SkFontHost::GetGammaTables(const uint8_t* tables[2]) |
| 411 | { |
| 412 | tables[0] = NULL; // black gamma (e.g. exp=1.4) |
| 413 | tables[1] = NULL; // white gamma (e.g. exp= 1/1.4) |
| 414 | } |
| 415 | |