1 /* 2 * Copyright (C) 2013 The Android Open Source Project 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 #define LOG_TAG "Minikin" 18 #include <cutils/log.h> 19 20 #include <math.h> 21 #include <stdio.h> // for debugging 22 23 #include <algorithm> 24 #include <fstream> 25 #include <iostream> // for debugging 26 #include <string> 27 #include <vector> 28 29 #include <utils/JenkinsHash.h> 30 #include <utils/LruCache.h> 31 #include <utils/Singleton.h> 32 #include <utils/String16.h> 33 34 #include <unicode/ubidi.h> 35 #include <hb-icu.h> 36 37 #include "MinikinInternal.h" 38 #include <minikin/MinikinFontFreeType.h> 39 #include <minikin/Layout.h> 40 41 using std::string; 42 using std::vector; 43 44 namespace minikin { 45 46 Bitmap::Bitmap(int width, int height) : width(width), height(height) { 47 buf = new uint8_t[width * height](); 48 } 49 50 Bitmap::~Bitmap() { 51 delete[] buf; 52 } 53 54 void Bitmap::writePnm(std::ofstream &o) const { 55 o << "P5" << std::endl; 56 o << width << " " << height << std::endl; 57 o << "255" << std::endl; 58 o.write((const char *)buf, width * height); 59 o.close(); 60 } 61 62 void Bitmap::drawGlyph(const android::GlyphBitmap& bitmap, int x, int y) { 63 int bmw = bitmap.width; 64 int bmh = bitmap.height; 65 x += bitmap.left; 66 y -= bitmap.top; 67 int x0 = std::max(0, x); 68 int x1 = std::min(width, x + bmw); 69 int y0 = std::max(0, y); 70 int y1 = std::min(height, y + bmh); 71 const unsigned char* src = bitmap.buffer + (y0 - y) * bmw + (x0 - x); 72 uint8_t* dst = buf + y0 * width; 73 for (int yy = y0; yy < y1; yy++) { 74 for (int xx = x0; xx < x1; xx++) { 75 int pixel = (int)dst[xx] + (int)src[xx - x]; 76 pixel = pixel > 0xff ? 0xff : pixel; 77 dst[xx] = pixel; 78 } 79 src += bmw; 80 dst += width; 81 } 82 } 83 84 } // namespace minikin 85 86 namespace android { 87 88 const int kDirection_Mask = 0x1; 89 90 struct LayoutContext { 91 MinikinPaint paint; 92 FontStyle style; 93 std::vector<hb_font_t*> hbFonts; // parallel to mFaces 94 95 void clearHbFonts() { 96 for (size_t i = 0; i < hbFonts.size(); i++) { 97 hb_font_destroy(hbFonts[i]); 98 } 99 hbFonts.clear(); 100 } 101 }; 102 103 // Layout cache datatypes 104 105 class LayoutCacheKey { 106 public: 107 LayoutCacheKey(const FontCollection* collection, const MinikinPaint& paint, FontStyle style, 108 const uint16_t* chars, size_t start, size_t count, size_t nchars, bool dir) 109 : mChars(chars), mNchars(nchars), 110 mStart(start), mCount(count), mId(collection->getId()), mStyle(style), 111 mSize(paint.size), mScaleX(paint.scaleX), mSkewX(paint.skewX), 112 mLetterSpacing(paint.letterSpacing), 113 mPaintFlags(paint.paintFlags), mHyphenEdit(paint.hyphenEdit), mIsRtl(dir) { 114 } 115 bool operator==(const LayoutCacheKey &other) const; 116 hash_t hash() const; 117 118 void copyText() { 119 uint16_t* charsCopy = new uint16_t[mNchars]; 120 memcpy(charsCopy, mChars, mNchars * sizeof(uint16_t)); 121 mChars = charsCopy; 122 } 123 void freeText() { 124 delete[] mChars; 125 mChars = NULL; 126 } 127 128 void doLayout(Layout* layout, LayoutContext* ctx, const FontCollection* collection) const { 129 layout->setFontCollection(collection); 130 layout->mAdvances.resize(mCount, 0); 131 ctx->clearHbFonts(); 132 layout->doLayoutRun(mChars, mStart, mCount, mNchars, mIsRtl, ctx); 133 } 134 135 private: 136 const uint16_t* mChars; 137 size_t mNchars; 138 size_t mStart; 139 size_t mCount; 140 uint32_t mId; // for the font collection 141 FontStyle mStyle; 142 float mSize; 143 float mScaleX; 144 float mSkewX; 145 float mLetterSpacing; 146 int32_t mPaintFlags; 147 HyphenEdit mHyphenEdit; 148 bool mIsRtl; 149 // Note: any fields added to MinikinPaint must also be reflected here. 150 // TODO: language matching (possibly integrate into style) 151 }; 152 153 class LayoutCache : private OnEntryRemoved<LayoutCacheKey, Layout*> { 154 public: 155 LayoutCache() : mCache(kMaxEntries) { 156 mCache.setOnEntryRemovedListener(this); 157 } 158 159 void clear() { 160 mCache.clear(); 161 } 162 163 Layout* get(LayoutCacheKey& key, LayoutContext* ctx, const FontCollection* collection) { 164 Layout* layout = mCache.get(key); 165 if (layout == NULL) { 166 key.copyText(); 167 layout = new Layout(); 168 key.doLayout(layout, ctx, collection); 169 mCache.put(key, layout); 170 } 171 return layout; 172 } 173 174 private: 175 // callback for OnEntryRemoved 176 void operator()(LayoutCacheKey& key, Layout*& value) { 177 key.freeText(); 178 delete value; 179 } 180 181 LruCache<LayoutCacheKey, Layout*> mCache; 182 183 //static const size_t kMaxEntries = LruCache<LayoutCacheKey, Layout*>::kUnlimitedCapacity; 184 185 // TODO: eviction based on memory footprint; for now, we just use a constant 186 // number of strings 187 static const size_t kMaxEntries = 5000; 188 }; 189 190 class HbFaceCache : private OnEntryRemoved<int32_t, hb_face_t*> { 191 public: 192 HbFaceCache() : mCache(kMaxEntries) { 193 mCache.setOnEntryRemovedListener(this); 194 } 195 196 // callback for OnEntryRemoved 197 void operator()(int32_t& key, hb_face_t*& value) { 198 hb_face_destroy(value); 199 } 200 201 LruCache<int32_t, hb_face_t*> mCache; 202 private: 203 static const size_t kMaxEntries = 100; 204 }; 205 206 static unsigned int disabledDecomposeCompatibility(hb_unicode_funcs_t*, hb_codepoint_t, 207 hb_codepoint_t*, void*) { 208 return 0; 209 } 210 211 class LayoutEngine : public Singleton<LayoutEngine> { 212 public: 213 LayoutEngine() { 214 unicodeFunctions = hb_unicode_funcs_create(hb_icu_get_unicode_funcs()); 215 /* Disable the function used for compatibility decomposition */ 216 hb_unicode_funcs_set_decompose_compatibility_func( 217 unicodeFunctions, disabledDecomposeCompatibility, NULL, NULL); 218 hbBuffer = hb_buffer_create(); 219 hb_buffer_set_unicode_funcs(hbBuffer, unicodeFunctions); 220 } 221 222 hb_buffer_t* hbBuffer; 223 hb_unicode_funcs_t* unicodeFunctions; 224 LayoutCache layoutCache; 225 HbFaceCache hbFaceCache; 226 }; 227 228 ANDROID_SINGLETON_STATIC_INSTANCE(LayoutEngine); 229 230 bool LayoutCacheKey::operator==(const LayoutCacheKey& other) const { 231 return mId == other.mId 232 && mStart == other.mStart 233 && mCount == other.mCount 234 && mStyle == other.mStyle 235 && mSize == other.mSize 236 && mScaleX == other.mScaleX 237 && mSkewX == other.mSkewX 238 && mLetterSpacing == other.mLetterSpacing 239 && mPaintFlags == other.mPaintFlags 240 && mHyphenEdit == other.mHyphenEdit 241 && mIsRtl == other.mIsRtl 242 && mNchars == other.mNchars 243 && !memcmp(mChars, other.mChars, mNchars * sizeof(uint16_t)); 244 } 245 246 hash_t LayoutCacheKey::hash() const { 247 uint32_t hash = JenkinsHashMix(0, mId); 248 hash = JenkinsHashMix(hash, mStart); 249 hash = JenkinsHashMix(hash, mCount); 250 hash = JenkinsHashMix(hash, hash_type(mStyle)); 251 hash = JenkinsHashMix(hash, hash_type(mSize)); 252 hash = JenkinsHashMix(hash, hash_type(mScaleX)); 253 hash = JenkinsHashMix(hash, hash_type(mSkewX)); 254 hash = JenkinsHashMix(hash, hash_type(mLetterSpacing)); 255 hash = JenkinsHashMix(hash, hash_type(mPaintFlags)); 256 hash = JenkinsHashMix(hash, hash_type(mHyphenEdit.hasHyphen())); 257 hash = JenkinsHashMix(hash, hash_type(mIsRtl)); 258 hash = JenkinsHashMixShorts(hash, mChars, mNchars); 259 return JenkinsHashWhiten(hash); 260 } 261 262 hash_t hash_type(const LayoutCacheKey& key) { 263 return key.hash(); 264 } 265 266 void MinikinRect::join(const MinikinRect& r) { 267 if (isEmpty()) { 268 set(r); 269 } else if (!r.isEmpty()) { 270 mLeft = std::min(mLeft, r.mLeft); 271 mTop = std::min(mTop, r.mTop); 272 mRight = std::max(mRight, r.mRight); 273 mBottom = std::max(mBottom, r.mBottom); 274 } 275 } 276 277 // Deprecated. Remove when callers are removed. 278 void Layout::init() { 279 } 280 281 void Layout::reset() { 282 mGlyphs.clear(); 283 mFaces.clear(); 284 mBounds.setEmpty(); 285 mAdvances.clear(); 286 mAdvance = 0; 287 } 288 289 void Layout::setFontCollection(const FontCollection* collection) { 290 mCollection = collection; 291 } 292 293 hb_blob_t* referenceTable(hb_face_t* face, hb_tag_t tag, void* userData) { 294 MinikinFont* font = reinterpret_cast<MinikinFont*>(userData); 295 size_t length = 0; 296 bool ok = font->GetTable(tag, NULL, &length); 297 if (!ok) { 298 return 0; 299 } 300 char* buffer = reinterpret_cast<char*>(malloc(length)); 301 if (!buffer) { 302 return 0; 303 } 304 ok = font->GetTable(tag, reinterpret_cast<uint8_t*>(buffer), &length); 305 printf("referenceTable %c%c%c%c length=%d %d\n", 306 (tag >>24) & 0xff, (tag>>16)&0xff, (tag>>8)&0xff, tag&0xff, length, ok); 307 if (!ok) { 308 free(buffer); 309 return 0; 310 } 311 return hb_blob_create(const_cast<char*>(buffer), length, 312 HB_MEMORY_MODE_WRITABLE, buffer, free); 313 } 314 315 static hb_bool_t harfbuzzGetGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData) 316 { 317 MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData); 318 MinikinFont* font = paint->font; 319 uint32_t glyph_id; 320 bool ok = font->GetGlyph(unicode, &glyph_id); 321 if (ok) { 322 *glyph = glyph_id; 323 } 324 return ok; 325 } 326 327 static hb_position_t harfbuzzGetGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData) 328 { 329 MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData); 330 MinikinFont* font = paint->font; 331 float advance = font->GetHorizontalAdvance(glyph, *paint); 332 return 256 * advance + 0.5; 333 } 334 335 static hb_bool_t harfbuzzGetGlyphHorizontalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData) 336 { 337 // Just return true, following the way that Harfbuzz-FreeType 338 // implementation does. 339 return true; 340 } 341 342 hb_font_funcs_t* getHbFontFuncs() { 343 static hb_font_funcs_t* hbFontFuncs = 0; 344 345 if (hbFontFuncs == 0) { 346 hbFontFuncs = hb_font_funcs_create(); 347 hb_font_funcs_set_glyph_func(hbFontFuncs, harfbuzzGetGlyph, 0, 0); 348 hb_font_funcs_set_glyph_h_advance_func(hbFontFuncs, harfbuzzGetGlyphHorizontalAdvance, 0, 0); 349 hb_font_funcs_set_glyph_h_origin_func(hbFontFuncs, harfbuzzGetGlyphHorizontalOrigin, 0, 0); 350 hb_font_funcs_make_immutable(hbFontFuncs); 351 } 352 return hbFontFuncs; 353 } 354 355 static hb_face_t* getHbFace(MinikinFont* minikinFont) { 356 HbFaceCache& cache = LayoutEngine::getInstance().hbFaceCache; 357 int32_t fontId = minikinFont->GetUniqueId(); 358 hb_face_t* face = cache.mCache.get(fontId); 359 if (face == NULL) { 360 face = hb_face_create_for_tables(referenceTable, minikinFont, NULL); 361 cache.mCache.put(fontId, face); 362 } 363 return face; 364 } 365 366 static hb_font_t* create_hb_font(MinikinFont* minikinFont, MinikinPaint* minikinPaint) { 367 hb_face_t* face = getHbFace(minikinFont); 368 hb_font_t* font = hb_font_create(face); 369 hb_font_set_funcs(font, getHbFontFuncs(), minikinPaint, 0); 370 return font; 371 } 372 373 static float HBFixedToFloat(hb_position_t v) 374 { 375 return scalbnf (v, -8); 376 } 377 378 static hb_position_t HBFloatToFixed(float v) 379 { 380 return scalbnf (v, +8); 381 } 382 383 void Layout::dump() const { 384 for (size_t i = 0; i < mGlyphs.size(); i++) { 385 const LayoutGlyph& glyph = mGlyphs[i]; 386 std::cout << glyph.glyph_id << ": " << glyph.x << ", " << glyph.y << std::endl; 387 } 388 } 389 390 int Layout::findFace(FakedFont face, LayoutContext* ctx) { 391 unsigned int ix; 392 for (ix = 0; ix < mFaces.size(); ix++) { 393 if (mFaces[ix].font == face.font) { 394 return ix; 395 } 396 } 397 mFaces.push_back(face); 398 // Note: ctx == NULL means we're copying from the cache, no need to create 399 // corresponding hb_font object. 400 if (ctx != NULL) { 401 hb_font_t* font = create_hb_font(face.font, &ctx->paint); 402 ctx->hbFonts.push_back(font); 403 } 404 return ix; 405 } 406 407 static hb_script_t codePointToScript(hb_codepoint_t codepoint) { 408 static hb_unicode_funcs_t* u = 0; 409 if (!u) { 410 u = LayoutEngine::getInstance().unicodeFunctions; 411 } 412 return hb_unicode_script(u, codepoint); 413 } 414 415 static hb_codepoint_t decodeUtf16(const uint16_t* chars, size_t len, ssize_t* iter) { 416 const uint16_t v = chars[(*iter)++]; 417 // test whether v in (0xd800..0xdfff), lead or trail surrogate 418 if ((v & 0xf800) == 0xd800) { 419 // test whether v in (0xd800..0xdbff), lead surrogate 420 if (size_t(*iter) < len && (v & 0xfc00) == 0xd800) { 421 const uint16_t v2 = chars[(*iter)++]; 422 // test whether v2 in (0xdc00..0xdfff), trail surrogate 423 if ((v2 & 0xfc00) == 0xdc00) { 424 // (0xd800 0xdc00) in utf-16 maps to 0x10000 in ucs-32 425 const hb_codepoint_t delta = (0xd800 << 10) + 0xdc00 - 0x10000; 426 return (((hb_codepoint_t)v) << 10) + v2 - delta; 427 } 428 (*iter) -= 1; 429 return 0xFFFDu; 430 } else { 431 return 0xFFFDu; 432 } 433 } else { 434 return v; 435 } 436 } 437 438 static hb_script_t getScriptRun(const uint16_t* chars, size_t len, ssize_t* iter) { 439 if (size_t(*iter) == len) { 440 return HB_SCRIPT_UNKNOWN; 441 } 442 uint32_t cp = decodeUtf16(chars, len, iter); 443 hb_script_t current_script = codePointToScript(cp); 444 for (;;) { 445 if (size_t(*iter) == len) 446 break; 447 const ssize_t prev_iter = *iter; 448 cp = decodeUtf16(chars, len, iter); 449 const hb_script_t script = codePointToScript(cp); 450 if (script != current_script) { 451 if (current_script == HB_SCRIPT_INHERITED || 452 current_script == HB_SCRIPT_COMMON) { 453 current_script = script; 454 } else if (script == HB_SCRIPT_INHERITED || 455 script == HB_SCRIPT_COMMON) { 456 continue; 457 } else { 458 *iter = prev_iter; 459 break; 460 } 461 } 462 } 463 if (current_script == HB_SCRIPT_INHERITED) { 464 current_script = HB_SCRIPT_COMMON; 465 } 466 467 return current_script; 468 } 469 470 /** 471 * For the purpose of layout, a word break is a boundary with no 472 * kerning or complex script processing. This is necessarily a 473 * heuristic, but should be accurate most of the time. 474 */ 475 static bool isWordBreak(int c) { 476 if (c == ' ' || (c >= 0x2000 && c <= 0x200a) || c == 0x3000) { 477 // spaces 478 return true; 479 } 480 if ((c >= 0x3400 && c <= 0x9fff)) { 481 // CJK ideographs (and yijing hexagram symbols) 482 return true; 483 } 484 // Note: kana is not included, as sophisticated fonts may kern kana 485 return false; 486 } 487 488 /** 489 * Return offset of previous word break. It is either < offset or == 0. 490 */ 491 static size_t getPrevWordBreak(const uint16_t* chars, size_t offset) { 492 if (offset == 0) return 0; 493 if (isWordBreak(chars[offset - 1])) { 494 return offset - 1; 495 } 496 for (size_t i = offset - 1; i > 0; i--) { 497 if (isWordBreak(chars[i - 1])) { 498 return i; 499 } 500 } 501 return 0; 502 } 503 504 /** 505 * Return offset of next word break. It is either > offset or == len. 506 */ 507 static size_t getNextWordBreak(const uint16_t* chars, size_t offset, size_t len) { 508 if (offset >= len) return len; 509 if (isWordBreak(chars[offset])) { 510 return offset + 1; 511 } 512 for (size_t i = offset + 1; i < len; i++) { 513 if (isWordBreak(chars[i])) { 514 return i; 515 } 516 } 517 return len; 518 } 519 520 /** 521 * Disable certain scripts (mostly those with cursive connection) from having letterspacing 522 * applied. See https://github.com/behdad/harfbuzz/issues/64 for more details. 523 */ 524 static bool isScriptOkForLetterspacing(hb_script_t script) { 525 return !( 526 script == HB_SCRIPT_ARABIC || 527 script == HB_SCRIPT_NKO || 528 script == HB_SCRIPT_PSALTER_PAHLAVI || 529 script == HB_SCRIPT_MANDAIC || 530 script == HB_SCRIPT_MONGOLIAN || 531 script == HB_SCRIPT_PHAGS_PA || 532 script == HB_SCRIPT_DEVANAGARI || 533 script == HB_SCRIPT_BENGALI || 534 script == HB_SCRIPT_GURMUKHI || 535 script == HB_SCRIPT_MODI || 536 script == HB_SCRIPT_SHARADA || 537 script == HB_SCRIPT_SYLOTI_NAGRI || 538 script == HB_SCRIPT_TIRHUTA || 539 script == HB_SCRIPT_OGHAM 540 ); 541 } 542 543 void Layout::doLayout(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 544 int bidiFlags, const FontStyle &style, const MinikinPaint &paint) { 545 AutoMutex _l(gMinikinLock); 546 547 LayoutContext ctx; 548 ctx.style = style; 549 ctx.paint = paint; 550 551 bool isRtl = (bidiFlags & kDirection_Mask) != 0; 552 bool doSingleRun = true; 553 554 reset(); 555 mAdvances.resize(count, 0); 556 557 if (!(bidiFlags == kBidi_Force_LTR || bidiFlags == kBidi_Force_RTL)) { 558 UBiDi* bidi = ubidi_open(); 559 if (bidi) { 560 UErrorCode status = U_ZERO_ERROR; 561 UBiDiLevel bidiReq = bidiFlags; 562 if (bidiFlags == kBidi_Default_LTR) { 563 bidiReq = UBIDI_DEFAULT_LTR; 564 } else if (bidiFlags == kBidi_Default_RTL) { 565 bidiReq = UBIDI_DEFAULT_RTL; 566 } 567 ubidi_setPara(bidi, buf, bufSize, bidiReq, NULL, &status); 568 if (U_SUCCESS(status)) { 569 int paraDir = ubidi_getParaLevel(bidi) & kDirection_Mask; 570 ssize_t rc = ubidi_countRuns(bidi, &status); 571 if (!U_SUCCESS(status) || rc < 0) { 572 ALOGW("error counting bidi runs, status = %d", status); 573 } 574 if (!U_SUCCESS(status) || rc <= 1) { 575 isRtl = (paraDir == kBidi_RTL); 576 } else { 577 doSingleRun = false; 578 // iterate through runs 579 for (ssize_t i = 0; i < (ssize_t)rc; i++) { 580 int32_t startRun = -1; 581 int32_t lengthRun = -1; 582 UBiDiDirection runDir = ubidi_getVisualRun(bidi, i, &startRun, &lengthRun); 583 if (startRun == -1 || lengthRun == -1) { 584 ALOGE("invalid visual run"); 585 // skip the invalid run 586 continue; 587 } 588 int32_t endRun = std::min(startRun + lengthRun, int32_t(start + count)); 589 startRun = std::max(startRun, int32_t(start)); 590 lengthRun = endRun - startRun; 591 if (lengthRun > 0) { 592 isRtl = (runDir == UBIDI_RTL); 593 doLayoutRunCached(buf, startRun, lengthRun, bufSize, isRtl, &ctx, 594 start); 595 } 596 } 597 } 598 } else { 599 ALOGE("error calling ubidi_setPara, status = %d", status); 600 } 601 ubidi_close(bidi); 602 } else { 603 ALOGE("error creating bidi object"); 604 } 605 } 606 if (doSingleRun) { 607 doLayoutRunCached(buf, start, count, bufSize, isRtl, &ctx, start); 608 } 609 ctx.clearHbFonts(); 610 } 611 612 void Layout::doLayoutRunCached(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 613 bool isRtl, LayoutContext* ctx, size_t dstStart) { 614 HyphenEdit hyphen = ctx->paint.hyphenEdit; 615 if (!isRtl) { 616 // left to right 617 size_t wordstart = start == bufSize ? start : getPrevWordBreak(buf, start + 1); 618 size_t wordend; 619 for (size_t iter = start; iter < start + count; iter = wordend) { 620 wordend = getNextWordBreak(buf, iter, bufSize); 621 // Only apply hyphen to the last word in the string. 622 ctx->paint.hyphenEdit = wordend >= start + count ? hyphen : HyphenEdit(); 623 size_t wordcount = std::min(start + count, wordend) - iter; 624 doLayoutWord(buf + wordstart, iter - wordstart, wordcount, wordend - wordstart, 625 isRtl, ctx, iter - dstStart); 626 wordstart = wordend; 627 } 628 } else { 629 // right to left 630 size_t wordstart; 631 size_t end = start + count; 632 size_t wordend = end == 0 ? 0 : getNextWordBreak(buf, end - 1, bufSize); 633 for (size_t iter = end; iter > start; iter = wordstart) { 634 wordstart = getPrevWordBreak(buf, iter); 635 // Only apply hyphen to the last (leftmost) word in the string. 636 ctx->paint.hyphenEdit = iter == end ? hyphen : HyphenEdit(); 637 size_t bufStart = std::max(start, wordstart); 638 doLayoutWord(buf + wordstart, bufStart - wordstart, iter - bufStart, 639 wordend - wordstart, isRtl, ctx, bufStart - dstStart); 640 wordend = wordstart; 641 } 642 } 643 } 644 645 void Layout::doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 646 bool isRtl, LayoutContext* ctx, size_t bufStart) { 647 LayoutCache& cache = LayoutEngine::getInstance().layoutCache; 648 LayoutCacheKey key(mCollection, ctx->paint, ctx->style, buf, start, count, bufSize, isRtl); 649 bool skipCache = ctx->paint.skipCache(); 650 if (skipCache) { 651 Layout layout; 652 key.doLayout(&layout, ctx, mCollection); 653 appendLayout(&layout, bufStart); 654 } else { 655 Layout* layout = cache.get(key, ctx, mCollection); 656 appendLayout(layout, bufStart); 657 } 658 } 659 660 static void addFeatures(const string &str, vector<hb_feature_t>* features) { 661 if (!str.size()) 662 return; 663 664 const char* start = str.c_str(); 665 const char* end = start + str.size(); 666 667 while (start < end) { 668 static hb_feature_t feature; 669 const char* p = strchr(start, ','); 670 if (!p) 671 p = end; 672 /* We do not allow setting features on ranges. As such, reject any 673 * setting that has non-universal range. */ 674 if (hb_feature_from_string (start, p - start, &feature) 675 && feature.start == 0 && feature.end == (unsigned int) -1) 676 features->push_back(feature); 677 start = p + 1; 678 } 679 } 680 681 void Layout::doLayoutRun(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 682 bool isRtl, LayoutContext* ctx) { 683 hb_buffer_t* buffer = LayoutEngine::getInstance().hbBuffer; 684 vector<FontCollection::Run> items; 685 mCollection->itemize(buf + start, count, ctx->style, &items); 686 if (isRtl) { 687 std::reverse(items.begin(), items.end()); 688 } 689 690 vector<hb_feature_t> features; 691 // Disable default-on non-required ligature features if letter-spacing 692 // See http://dev.w3.org/csswg/css-text-3/#letter-spacing-property 693 // "When the effective spacing between two characters is not zero (due to 694 // either justification or a non-zero value of letter-spacing), user agents 695 // should not apply optional ligatures." 696 if (fabs(ctx->paint.letterSpacing) > 0.03) 697 { 698 static const hb_feature_t no_liga = { HB_TAG('l', 'i', 'g', 'a'), 0, 0, ~0u }; 699 static const hb_feature_t no_clig = { HB_TAG('c', 'l', 'i', 'g'), 0, 0, ~0u }; 700 features.push_back(no_liga); 701 features.push_back(no_clig); 702 } 703 addFeatures(ctx->paint.fontFeatureSettings, &features); 704 705 double size = ctx->paint.size; 706 double scaleX = ctx->paint.scaleX; 707 708 float x = mAdvance; 709 float y = 0; 710 for (size_t run_ix = 0; run_ix < items.size(); run_ix++) { 711 FontCollection::Run &run = items[run_ix]; 712 if (run.fakedFont.font == NULL) { 713 ALOGE("no font for run starting u+%04x length %d", buf[run.start], run.end - run.start); 714 continue; 715 } 716 int font_ix = findFace(run.fakedFont, ctx); 717 ctx->paint.font = mFaces[font_ix].font; 718 ctx->paint.fakery = mFaces[font_ix].fakery; 719 hb_font_t* hbFont = ctx->hbFonts[font_ix]; 720 #ifdef VERBOSE 721 std::cout << "Run " << run_ix << ", font " << font_ix << 722 " [" << run.start << ":" << run.end << "]" << std::endl; 723 #endif 724 725 hb_font_set_ppem(hbFont, size * scaleX, size); 726 hb_font_set_scale(hbFont, HBFloatToFixed(size * scaleX), HBFloatToFixed(size)); 727 728 // TODO: if there are multiple scripts within a font in an RTL run, 729 // we need to reorder those runs. This is unlikely with our current 730 // font stack, but should be done for correctness. 731 ssize_t srunend; 732 for (ssize_t srunstart = run.start; srunstart < run.end; srunstart = srunend) { 733 srunend = srunstart; 734 hb_script_t script = getScriptRun(buf + start, run.end, &srunend); 735 736 double letterSpace = 0.0; 737 double letterSpaceHalfLeft = 0.0; 738 double letterSpaceHalfRight = 0.0; 739 740 if (ctx->paint.letterSpacing != 0.0 && isScriptOkForLetterspacing(script)) { 741 letterSpace = ctx->paint.letterSpacing * size * scaleX; 742 if ((ctx->paint.paintFlags & LinearTextFlag) == 0) { 743 letterSpace = round(letterSpace); 744 letterSpaceHalfLeft = floor(letterSpace * 0.5); 745 } else { 746 letterSpaceHalfLeft = letterSpace * 0.5; 747 } 748 letterSpaceHalfRight = letterSpace - letterSpaceHalfLeft; 749 } 750 751 hb_buffer_clear_contents(buffer); 752 hb_buffer_set_script(buffer, script); 753 hb_buffer_set_direction(buffer, isRtl? HB_DIRECTION_RTL : HB_DIRECTION_LTR); 754 FontLanguage language = ctx->style.getLanguage(); 755 if (language) { 756 string lang = language.getString(); 757 hb_buffer_set_language(buffer, hb_language_from_string(lang.c_str(), -1)); 758 } 759 hb_buffer_add_utf16(buffer, buf, bufSize, srunstart + start, srunend - srunstart); 760 if (ctx->paint.hyphenEdit.hasHyphen() && srunend > srunstart) { 761 // TODO: check whether this is really the desired semantics. It could have the 762 // effect of assigning the hyphen width to a nonspacing mark 763 unsigned int lastCluster = start + srunend - 1; 764 765 hb_codepoint_t hyphenChar = 0x2010; // HYPHEN 766 hb_codepoint_t glyph; 767 // Fallback to ASCII HYPHEN-MINUS if the font didn't have a glyph for HYPHEN. Note 768 // that we intentionally don't do anything special if the font doesn't have a 769 // HYPHEN-MINUS either, so a tofu could be shown, hinting towards something 770 // missing. 771 if (!hb_font_get_glyph(hbFont, hyphenChar, 0, &glyph)) { 772 hyphenChar = 0x002D; // HYPHEN-MINUS 773 } 774 hb_buffer_add(buffer, hyphenChar, lastCluster); 775 } 776 hb_shape(hbFont, buffer, features.empty() ? NULL : &features[0], features.size()); 777 unsigned int numGlyphs; 778 hb_glyph_info_t* info = hb_buffer_get_glyph_infos(buffer, &numGlyphs); 779 hb_glyph_position_t* positions = hb_buffer_get_glyph_positions(buffer, NULL); 780 if (numGlyphs) 781 { 782 mAdvances[info[0].cluster - start] += letterSpaceHalfLeft; 783 x += letterSpaceHalfLeft; 784 } 785 for (unsigned int i = 0; i < numGlyphs; i++) { 786 #ifdef VERBOSE 787 std::cout << positions[i].x_advance << " " << positions[i].y_advance << " " << positions[i].x_offset << " " << positions[i].y_offset << std::endl; std::cout << "DoLayout " << info[i].codepoint << 788 ": " << HBFixedToFloat(positions[i].x_advance) << "; " << positions[i].x_offset << ", " << positions[i].y_offset << std::endl; 789 #endif 790 if (i > 0 && info[i - 1].cluster != info[i].cluster) { 791 mAdvances[info[i - 1].cluster - start] += letterSpaceHalfRight; 792 mAdvances[info[i].cluster - start] += letterSpaceHalfLeft; 793 x += letterSpace; 794 } 795 796 hb_codepoint_t glyph_ix = info[i].codepoint; 797 float xoff = HBFixedToFloat(positions[i].x_offset); 798 float yoff = -HBFixedToFloat(positions[i].y_offset); 799 xoff += yoff * ctx->paint.skewX; 800 LayoutGlyph glyph = {font_ix, glyph_ix, x + xoff, y + yoff}; 801 mGlyphs.push_back(glyph); 802 float xAdvance = HBFixedToFloat(positions[i].x_advance); 803 if ((ctx->paint.paintFlags & LinearTextFlag) == 0) { 804 xAdvance = roundf(xAdvance); 805 } 806 MinikinRect glyphBounds; 807 ctx->paint.font->GetBounds(&glyphBounds, glyph_ix, ctx->paint); 808 glyphBounds.offset(x + xoff, y + yoff); 809 mBounds.join(glyphBounds); 810 if (info[i].cluster - start < count) { 811 mAdvances[info[i].cluster - start] += xAdvance; 812 } else { 813 ALOGE("cluster %d (start %d) out of bounds of count %d", 814 info[i].cluster - start, start, count); 815 } 816 x += xAdvance; 817 } 818 if (numGlyphs) 819 { 820 mAdvances[info[numGlyphs - 1].cluster - start] += letterSpaceHalfRight; 821 x += letterSpaceHalfRight; 822 } 823 } 824 } 825 mAdvance = x; 826 } 827 828 void Layout::appendLayout(Layout* src, size_t start) { 829 int fontMapStack[16]; 830 int* fontMap; 831 if (src->mFaces.size() < sizeof(fontMapStack) / sizeof(fontMapStack[0])) { 832 fontMap = fontMapStack; 833 } else { 834 fontMap = new int[src->mFaces.size()]; 835 } 836 for (size_t i = 0; i < src->mFaces.size(); i++) { 837 int font_ix = findFace(src->mFaces[i], NULL); 838 fontMap[i] = font_ix; 839 } 840 int x0 = mAdvance; 841 for (size_t i = 0; i < src->mGlyphs.size(); i++) { 842 LayoutGlyph& srcGlyph = src->mGlyphs[i]; 843 int font_ix = fontMap[srcGlyph.font_ix]; 844 unsigned int glyph_id = srcGlyph.glyph_id; 845 float x = x0 + srcGlyph.x; 846 float y = srcGlyph.y; 847 LayoutGlyph glyph = {font_ix, glyph_id, x, y}; 848 mGlyphs.push_back(glyph); 849 } 850 for (size_t i = 0; i < src->mAdvances.size(); i++) { 851 mAdvances[i + start] = src->mAdvances[i]; 852 } 853 MinikinRect srcBounds(src->mBounds); 854 srcBounds.offset(x0, 0); 855 mBounds.join(srcBounds); 856 mAdvance += src->mAdvance; 857 858 if (fontMap != fontMapStack) { 859 delete[] fontMap; 860 } 861 } 862 863 void Layout::draw(minikin::Bitmap* surface, int x0, int y0, float size) const { 864 /* 865 TODO: redo as MinikinPaint settings 866 if (mProps.hasTag(minikinHinting)) { 867 int hintflags = mProps.value(minikinHinting).getIntValue(); 868 if (hintflags & 1) load_flags |= FT_LOAD_NO_HINTING; 869 if (hintflags & 2) load_flags |= FT_LOAD_NO_AUTOHINT; 870 } 871 */ 872 for (size_t i = 0; i < mGlyphs.size(); i++) { 873 const LayoutGlyph& glyph = mGlyphs[i]; 874 MinikinFont* mf = mFaces[glyph.font_ix].font; 875 MinikinFontFreeType* face = static_cast<MinikinFontFreeType*>(mf); 876 GlyphBitmap glyphBitmap; 877 MinikinPaint paint; 878 paint.size = size; 879 bool ok = face->Render(glyph.glyph_id, paint, &glyphBitmap); 880 printf("glyphBitmap.width=%d, glyphBitmap.height=%d (%d, %d) x=%f, y=%f, ok=%d\n", 881 glyphBitmap.width, glyphBitmap.height, glyphBitmap.left, glyphBitmap.top, glyph.x, glyph.y, ok); 882 if (ok) { 883 surface->drawGlyph(glyphBitmap, 884 x0 + int(floor(glyph.x + 0.5)), y0 + int(floor(glyph.y + 0.5))); 885 } 886 } 887 } 888 889 size_t Layout::nGlyphs() const { 890 return mGlyphs.size(); 891 } 892 893 MinikinFont* Layout::getFont(int i) const { 894 const LayoutGlyph& glyph = mGlyphs[i]; 895 return mFaces[glyph.font_ix].font; 896 } 897 898 FontFakery Layout::getFakery(int i) const { 899 const LayoutGlyph& glyph = mGlyphs[i]; 900 return mFaces[glyph.font_ix].fakery; 901 } 902 903 unsigned int Layout::getGlyphId(int i) const { 904 const LayoutGlyph& glyph = mGlyphs[i]; 905 return glyph.glyph_id; 906 } 907 908 float Layout::getX(int i) const { 909 const LayoutGlyph& glyph = mGlyphs[i]; 910 return glyph.x; 911 } 912 913 float Layout::getY(int i) const { 914 const LayoutGlyph& glyph = mGlyphs[i]; 915 return glyph.y; 916 } 917 918 float Layout::getAdvance() const { 919 return mAdvance; 920 } 921 922 void Layout::getAdvances(float* advances) { 923 memcpy(advances, &mAdvances[0], mAdvances.size() * sizeof(float)); 924 } 925 926 void Layout::getBounds(MinikinRect* bounds) { 927 bounds->set(mBounds); 928 } 929 930 void Layout::purgeCaches() { 931 AutoMutex _l(gMinikinLock); 932 LayoutCache& layoutCache = LayoutEngine::getInstance().layoutCache; 933 layoutCache.clear(); 934 HbFaceCache& hbCache = LayoutEngine::getInstance().hbFaceCache; 935 hbCache.mCache.clear(); 936 } 937 938 } // namespace android 939
