Layout.cpp revision 0bbff3a96d3836079371cdd4398c21afad3c5234
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 41using std::string; 42using std::vector; 43 44namespace android { 45 46// TODO: these should move into the header file, but for now we don't want 47// to cause namespace collisions with TextLayout.h 48enum { 49 kBidi_LTR = 0, 50 kBidi_RTL = 1, 51 kBidi_Default_LTR = 2, 52 kBidi_Default_RTL = 3, 53 kBidi_Force_LTR = 4, 54 kBidi_Force_RTL = 5, 55 56 kBidi_Mask = 0x7 57}; 58 59const int kDirection_Mask = 0x1; 60 61struct LayoutContext { 62 MinikinPaint paint; 63 FontStyle style; 64 std::vector<hb_font_t*> hbFonts; // parallel to mFaces 65 66 void clearHbFonts() { 67 for (size_t i = 0; i < hbFonts.size(); i++) { 68 hb_font_destroy(hbFonts[i]); 69 } 70 hbFonts.clear(); 71 } 72}; 73 74// Layout cache datatypes 75 76class LayoutCacheKey { 77public: 78 LayoutCacheKey(const FontCollection* collection, const MinikinPaint& paint, FontStyle style, 79 const uint16_t* chars, size_t start, size_t count, size_t nchars, bool dir) 80 : mChars(chars), mNchars(nchars), 81 mStart(start), mCount(count), mId(collection->getId()), mStyle(style), 82 mSize(paint.size), mScaleX(paint.scaleX), mSkewX(paint.skewX), 83 mLetterSpacing(paint.letterSpacing), 84 mPaintFlags(paint.paintFlags), mIsRtl(dir) { 85 } 86 bool operator==(const LayoutCacheKey &other) const; 87 hash_t hash() const; 88 89 void copyText() { 90 uint16_t* charsCopy = new uint16_t[mNchars]; 91 memcpy(charsCopy, mChars, mNchars * sizeof(uint16_t)); 92 mChars = charsCopy; 93 } 94 void freeText() { 95 delete[] mChars; 96 mChars = NULL; 97 } 98 99 void doLayout(Layout* layout, LayoutContext* ctx, const FontCollection* collection) const { 100 layout->setFontCollection(collection); 101 layout->mAdvances.resize(mCount, 0); 102 ctx->clearHbFonts(); 103 layout->doLayoutRun(mChars, mStart, mCount, mNchars, mIsRtl, ctx); 104 } 105 106private: 107 const uint16_t* mChars; 108 size_t mNchars; 109 size_t mStart; 110 size_t mCount; 111 uint32_t mId; // for the font collection 112 FontStyle mStyle; 113 float mSize; 114 float mScaleX; 115 float mSkewX; 116 float mLetterSpacing; 117 int32_t mPaintFlags; 118 bool mIsRtl; 119 // Note: any fields added to MinikinPaint must also be reflected here. 120 // TODO: language matching (possibly integrate into style) 121}; 122 123class LayoutCache : private OnEntryRemoved<LayoutCacheKey, Layout*> { 124public: 125 LayoutCache() : mCache(kMaxEntries) { 126 mCache.setOnEntryRemovedListener(this); 127 } 128 129 void clear() { 130 mCache.clear(); 131 } 132 133 Layout* get(LayoutCacheKey& key, LayoutContext* ctx, const FontCollection* collection) { 134 Layout* layout = mCache.get(key); 135 if (layout == NULL) { 136 key.copyText(); 137 layout = new Layout(); 138 key.doLayout(layout, ctx, collection); 139 mCache.put(key, layout); 140 } 141 return layout; 142 } 143 144private: 145 // callback for OnEntryRemoved 146 void operator()(LayoutCacheKey& key, Layout*& value) { 147 key.freeText(); 148 delete value; 149 } 150 151 LruCache<LayoutCacheKey, Layout*> mCache; 152 153 //static const size_t kMaxEntries = LruCache<LayoutCacheKey, Layout*>::kUnlimitedCapacity; 154 155 // TODO: eviction based on memory footprint; for now, we just use a constant 156 // number of strings 157 static const size_t kMaxEntries = 5000; 158}; 159 160class HbFaceCache : private OnEntryRemoved<int32_t, hb_face_t*> { 161public: 162 HbFaceCache() : mCache(kMaxEntries) { 163 mCache.setOnEntryRemovedListener(this); 164 } 165 166 // callback for OnEntryRemoved 167 void operator()(int32_t& key, hb_face_t*& value) { 168 hb_face_destroy(value); 169 } 170 171 LruCache<int32_t, hb_face_t*> mCache; 172private: 173 static const size_t kMaxEntries = 100; 174}; 175 176static unsigned int disabledDecomposeCompatibility(hb_unicode_funcs_t*, hb_codepoint_t, 177 hb_codepoint_t*, void*) { 178 return 0; 179} 180 181class LayoutEngine : public Singleton<LayoutEngine> { 182public: 183 LayoutEngine() { 184 unicodeFunctions = hb_unicode_funcs_create(hb_icu_get_unicode_funcs()); 185 /* Disable the function used for compatibility decomposition */ 186 hb_unicode_funcs_set_decompose_compatibility_func( 187 unicodeFunctions, disabledDecomposeCompatibility, NULL, NULL); 188 hbBuffer = hb_buffer_create(); 189 hb_buffer_set_unicode_funcs(hbBuffer, unicodeFunctions); 190 } 191 192 hb_buffer_t* hbBuffer; 193 hb_unicode_funcs_t* unicodeFunctions; 194 LayoutCache layoutCache; 195 HbFaceCache hbFaceCache; 196}; 197 198ANDROID_SINGLETON_STATIC_INSTANCE(LayoutEngine); 199 200bool LayoutCacheKey::operator==(const LayoutCacheKey& other) const { 201 return mId == other.mId 202 && mStart == other.mStart 203 && mCount == other.mCount 204 && mStyle == other.mStyle 205 && mSize == other.mSize 206 && mScaleX == other.mScaleX 207 && mSkewX == other.mSkewX 208 && mLetterSpacing == other.mLetterSpacing 209 && mPaintFlags == other.mPaintFlags 210 && mIsRtl == other.mIsRtl 211 && mNchars == other.mNchars 212 && !memcmp(mChars, other.mChars, mNchars * sizeof(uint16_t)); 213} 214 215hash_t LayoutCacheKey::hash() const { 216 uint32_t hash = JenkinsHashMix(0, mId); 217 hash = JenkinsHashMix(hash, mStart); 218 hash = JenkinsHashMix(hash, mCount); 219 hash = JenkinsHashMix(hash, hash_type(mStyle)); 220 hash = JenkinsHashMix(hash, hash_type(mSize)); 221 hash = JenkinsHashMix(hash, hash_type(mScaleX)); 222 hash = JenkinsHashMix(hash, hash_type(mSkewX)); 223 hash = JenkinsHashMix(hash, hash_type(mLetterSpacing)); 224 hash = JenkinsHashMix(hash, hash_type(mPaintFlags)); 225 hash = JenkinsHashMix(hash, hash_type(mIsRtl)); 226 hash = JenkinsHashMixShorts(hash, mChars, mNchars); 227 return JenkinsHashWhiten(hash); 228} 229 230hash_t hash_type(const LayoutCacheKey& key) { 231 return key.hash(); 232} 233 234Bitmap::Bitmap(int width, int height) : width(width), height(height) { 235 buf = new uint8_t[width * height](); 236} 237 238Bitmap::~Bitmap() { 239 delete[] buf; 240} 241 242void Bitmap::writePnm(std::ofstream &o) const { 243 o << "P5" << std::endl; 244 o << width << " " << height << std::endl; 245 o << "255" << std::endl; 246 o.write((const char *)buf, width * height); 247 o.close(); 248} 249 250void Bitmap::drawGlyph(const GlyphBitmap& bitmap, int x, int y) { 251 int bmw = bitmap.width; 252 int bmh = bitmap.height; 253 x += bitmap.left; 254 y -= bitmap.top; 255 int x0 = std::max(0, x); 256 int x1 = std::min(width, x + bmw); 257 int y0 = std::max(0, y); 258 int y1 = std::min(height, y + bmh); 259 const unsigned char* src = bitmap.buffer + (y0 - y) * bmw + (x0 - x); 260 uint8_t* dst = buf + y0 * width; 261 for (int yy = y0; yy < y1; yy++) { 262 for (int xx = x0; xx < x1; xx++) { 263 int pixel = (int)dst[xx] + (int)src[xx - x]; 264 pixel = pixel > 0xff ? 0xff : pixel; 265 dst[xx] = pixel; 266 } 267 src += bmw; 268 dst += width; 269 } 270} 271 272void MinikinRect::join(const MinikinRect& r) { 273 if (isEmpty()) { 274 set(r); 275 } else if (!r.isEmpty()) { 276 mLeft = std::min(mLeft, r.mLeft); 277 mTop = std::min(mTop, r.mTop); 278 mRight = std::max(mRight, r.mRight); 279 mBottom = std::max(mBottom, r.mBottom); 280 } 281} 282 283// Deprecated. Remove when callers are removed. 284void Layout::init() { 285} 286 287void Layout::reset() { 288 mGlyphs.clear(); 289 mFaces.clear(); 290 mBounds.setEmpty(); 291 mAdvances.clear(); 292 mAdvance = 0; 293} 294 295void Layout::setFontCollection(const FontCollection* collection) { 296 mCollection = collection; 297} 298 299hb_blob_t* referenceTable(hb_face_t* face, hb_tag_t tag, void* userData) { 300 MinikinFont* font = reinterpret_cast<MinikinFont*>(userData); 301 size_t length = 0; 302 bool ok = font->GetTable(tag, NULL, &length); 303 if (!ok) { 304 return 0; 305 } 306 char* buffer = reinterpret_cast<char*>(malloc(length)); 307 if (!buffer) { 308 return 0; 309 } 310 ok = font->GetTable(tag, reinterpret_cast<uint8_t*>(buffer), &length); 311 printf("referenceTable %c%c%c%c length=%d %d\n", 312 (tag >>24) & 0xff, (tag>>16)&0xff, (tag>>8)&0xff, tag&0xff, length, ok); 313 if (!ok) { 314 free(buffer); 315 return 0; 316 } 317 return hb_blob_create(const_cast<char*>(buffer), length, 318 HB_MEMORY_MODE_WRITABLE, buffer, free); 319} 320 321static hb_bool_t harfbuzzGetGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData) 322{ 323 MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData); 324 MinikinFont* font = paint->font; 325 uint32_t glyph_id; 326 bool ok = font->GetGlyph(unicode, &glyph_id); 327 if (ok) { 328 *glyph = glyph_id; 329 } 330 return ok; 331} 332 333static hb_position_t harfbuzzGetGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData) 334{ 335 MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData); 336 MinikinFont* font = paint->font; 337 float advance = font->GetHorizontalAdvance(glyph, *paint); 338 return 256 * advance + 0.5; 339} 340 341static hb_bool_t harfbuzzGetGlyphHorizontalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData) 342{ 343 // Just return true, following the way that Harfbuzz-FreeType 344 // implementation does. 345 return true; 346} 347 348hb_font_funcs_t* getHbFontFuncs() { 349 static hb_font_funcs_t* hbFontFuncs = 0; 350 351 if (hbFontFuncs == 0) { 352 hbFontFuncs = hb_font_funcs_create(); 353 hb_font_funcs_set_glyph_func(hbFontFuncs, harfbuzzGetGlyph, 0, 0); 354 hb_font_funcs_set_glyph_h_advance_func(hbFontFuncs, harfbuzzGetGlyphHorizontalAdvance, 0, 0); 355 hb_font_funcs_set_glyph_h_origin_func(hbFontFuncs, harfbuzzGetGlyphHorizontalOrigin, 0, 0); 356 hb_font_funcs_make_immutable(hbFontFuncs); 357 } 358 return hbFontFuncs; 359} 360 361static hb_face_t* getHbFace(MinikinFont* minikinFont) { 362 HbFaceCache& cache = LayoutEngine::getInstance().hbFaceCache; 363 int32_t fontId = minikinFont->GetUniqueId(); 364 hb_face_t* face = cache.mCache.get(fontId); 365 if (face == NULL) { 366 face = hb_face_create_for_tables(referenceTable, minikinFont, NULL); 367 cache.mCache.put(fontId, face); 368 } 369 return face; 370} 371 372static hb_font_t* create_hb_font(MinikinFont* minikinFont, MinikinPaint* minikinPaint) { 373 hb_face_t* face = getHbFace(minikinFont); 374 hb_font_t* font = hb_font_create(face); 375 hb_font_set_funcs(font, getHbFontFuncs(), minikinPaint, 0); 376 return font; 377} 378 379static float HBFixedToFloat(hb_position_t v) 380{ 381 return scalbnf (v, -8); 382} 383 384static hb_position_t HBFloatToFixed(float v) 385{ 386 return scalbnf (v, +8); 387} 388 389void Layout::dump() const { 390 for (size_t i = 0; i < mGlyphs.size(); i++) { 391 const LayoutGlyph& glyph = mGlyphs[i]; 392 std::cout << glyph.glyph_id << ": " << glyph.x << ", " << glyph.y << std::endl; 393 } 394} 395 396int Layout::findFace(FakedFont face, LayoutContext* ctx) { 397 unsigned int ix; 398 for (ix = 0; ix < mFaces.size(); ix++) { 399 if (mFaces[ix].font == face.font) { 400 return ix; 401 } 402 } 403 mFaces.push_back(face); 404 // Note: ctx == NULL means we're copying from the cache, no need to create 405 // corresponding hb_font object. 406 if (ctx != NULL) { 407 hb_font_t* font = create_hb_font(face.font, &ctx->paint); 408 ctx->hbFonts.push_back(font); 409 } 410 return ix; 411} 412 413static hb_script_t codePointToScript(hb_codepoint_t codepoint) { 414 static hb_unicode_funcs_t* u = 0; 415 if (!u) { 416 u = LayoutEngine::getInstance().unicodeFunctions; 417 } 418 return hb_unicode_script(u, codepoint); 419} 420 421static hb_codepoint_t decodeUtf16(const uint16_t* chars, size_t len, ssize_t* iter) { 422 const uint16_t v = chars[(*iter)++]; 423 // test whether v in (0xd800..0xdfff), lead or trail surrogate 424 if ((v & 0xf800) == 0xd800) { 425 // test whether v in (0xd800..0xdbff), lead surrogate 426 if (size_t(*iter) < len && (v & 0xfc00) == 0xd800) { 427 const uint16_t v2 = chars[(*iter)++]; 428 // test whether v2 in (0xdc00..0xdfff), trail surrogate 429 if ((v2 & 0xfc00) == 0xdc00) { 430 // (0xd800 0xdc00) in utf-16 maps to 0x10000 in ucs-32 431 const hb_codepoint_t delta = (0xd800 << 10) + 0xdc00 - 0x10000; 432 return (((hb_codepoint_t)v) << 10) + v2 - delta; 433 } 434 (*iter) -= 1; 435 return 0xFFFDu; 436 } else { 437 return 0xFFFDu; 438 } 439 } else { 440 return v; 441 } 442} 443 444static hb_script_t getScriptRun(const uint16_t* chars, size_t len, ssize_t* iter) { 445 if (size_t(*iter) == len) { 446 return HB_SCRIPT_UNKNOWN; 447 } 448 uint32_t cp = decodeUtf16(chars, len, iter); 449 hb_script_t current_script = codePointToScript(cp); 450 for (;;) { 451 if (size_t(*iter) == len) 452 break; 453 const ssize_t prev_iter = *iter; 454 cp = decodeUtf16(chars, len, iter); 455 const hb_script_t script = codePointToScript(cp); 456 if (script != current_script) { 457 if (current_script == HB_SCRIPT_INHERITED || 458 current_script == HB_SCRIPT_COMMON) { 459 current_script = script; 460 } else if (script == HB_SCRIPT_INHERITED || 461 script == HB_SCRIPT_COMMON) { 462 continue; 463 } else { 464 *iter = prev_iter; 465 break; 466 } 467 } 468 } 469 if (current_script == HB_SCRIPT_INHERITED) { 470 current_script = HB_SCRIPT_COMMON; 471 } 472 473 return current_script; 474} 475 476/** 477 * For the purpose of layout, a word break is a boundary with no 478 * kerning or complex script processing. This is necessarily a 479 * heuristic, but should be accurate most of the time. 480 */ 481static bool isWordBreak(int c) { 482 if (c == ' ' || (c >= 0x2000 && c <= 0x200a) || c == 0x3000) { 483 // spaces 484 return true; 485 } 486 if ((c >= 0x3400 && c <= 0x9fff)) { 487 // CJK ideographs (and yijing hexagram symbols) 488 return true; 489 } 490 // Note: kana is not included, as sophisticated fonts may kern kana 491 return false; 492} 493 494/** 495 * Return offset of previous word break. It is either < offset or == 0. 496 */ 497static size_t getPrevWordBreak(const uint16_t* chars, size_t offset) { 498 if (offset == 0) return 0; 499 if (isWordBreak(chars[offset - 1])) { 500 return offset - 1; 501 } 502 for (size_t i = offset - 1; i > 0; i--) { 503 if (isWordBreak(chars[i - 1])) { 504 return i; 505 } 506 } 507 return 0; 508} 509 510/** 511 * Return offset of next word break. It is either > offset or == len. 512 */ 513static size_t getNextWordBreak(const uint16_t* chars, size_t offset, size_t len) { 514 if (offset >= len) return len; 515 if (isWordBreak(chars[offset])) { 516 return offset + 1; 517 } 518 for (size_t i = offset + 1; i < len; i++) { 519 if (isWordBreak(chars[i])) { 520 return i; 521 } 522 } 523 return len; 524} 525 526void Layout::doLayout(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 527 int bidiFlags, const FontStyle &style, const MinikinPaint &paint) { 528 AutoMutex _l(gMinikinLock); 529 530 LayoutContext ctx; 531 ctx.style = style; 532 ctx.paint = paint; 533 534 bool isRtl = (bidiFlags & kDirection_Mask) != 0; 535 bool doSingleRun = true; 536 537 reset(); 538 mAdvances.resize(count, 0); 539 540 if (!(bidiFlags == kBidi_Force_LTR || bidiFlags == kBidi_Force_RTL)) { 541 UBiDi* bidi = ubidi_open(); 542 if (bidi) { 543 UErrorCode status = U_ZERO_ERROR; 544 UBiDiLevel bidiReq = bidiFlags; 545 if (bidiFlags == kBidi_Default_LTR) { 546 bidiReq = UBIDI_DEFAULT_LTR; 547 } else if (bidiFlags == kBidi_Default_RTL) { 548 bidiReq = UBIDI_DEFAULT_RTL; 549 } 550 ubidi_setPara(bidi, buf, bufSize, bidiReq, NULL, &status); 551 if (U_SUCCESS(status)) { 552 int paraDir = ubidi_getParaLevel(bidi) & kDirection_Mask; 553 ssize_t rc = ubidi_countRuns(bidi, &status); 554 if (!U_SUCCESS(status) || rc < 0) { 555 ALOGW("error counting bidi runs, status = %d", status); 556 } 557 if (!U_SUCCESS(status) || rc <= 1) { 558 isRtl = (paraDir == kBidi_RTL); 559 } else { 560 doSingleRun = false; 561 // iterate through runs 562 for (ssize_t i = 0; i < (ssize_t)rc; i++) { 563 int32_t startRun = -1; 564 int32_t lengthRun = -1; 565 UBiDiDirection runDir = ubidi_getVisualRun(bidi, i, &startRun, &lengthRun); 566 if (startRun == -1 || lengthRun == -1) { 567 ALOGE("invalid visual run"); 568 // skip the invalid run 569 continue; 570 } 571 int32_t endRun = std::min(startRun + lengthRun, int32_t(start + count)); 572 startRun = std::max(startRun, int32_t(start)); 573 lengthRun = endRun - startRun; 574 if (lengthRun > 0) { 575 isRtl = (runDir == UBIDI_RTL); 576 doLayoutRunCached(buf, startRun, lengthRun, bufSize, isRtl, &ctx, 577 start); 578 } 579 } 580 } 581 } else { 582 ALOGE("error calling ubidi_setPara, status = %d", status); 583 } 584 ubidi_close(bidi); 585 } else { 586 ALOGE("error creating bidi object"); 587 } 588 } 589 if (doSingleRun) { 590 doLayoutRunCached(buf, start, count, bufSize, isRtl, &ctx, start); 591 } 592 ctx.clearHbFonts(); 593} 594 595void Layout::doLayoutRunCached(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 596 bool isRtl, LayoutContext* ctx, size_t dstStart) { 597 if (!isRtl) { 598 // left to right 599 size_t wordstart = start == bufSize ? start : getPrevWordBreak(buf, start + 1); 600 size_t wordend; 601 for (size_t iter = start; iter < start + count; iter = wordend) { 602 wordend = getNextWordBreak(buf, iter, bufSize); 603 size_t wordcount = std::min(start + count, wordend) - iter; 604 doLayoutWord(buf + wordstart, iter - wordstart, wordcount, wordend - wordstart, 605 isRtl, ctx, iter - dstStart); 606 wordstart = wordend; 607 } 608 } else { 609 // right to left 610 size_t wordstart; 611 size_t end = start + count; 612 size_t wordend = end == 0 ? 0 : getNextWordBreak(buf, end - 1, bufSize); 613 for (size_t iter = end; iter > start; iter = wordstart) { 614 wordstart = getPrevWordBreak(buf, iter); 615 size_t bufStart = std::max(start, wordstart); 616 doLayoutWord(buf + wordstart, bufStart - wordstart, iter - bufStart, 617 wordend - wordstart, isRtl, ctx, bufStart - dstStart); 618 wordend = wordstart; 619 } 620 } 621} 622 623void Layout::doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 624 bool isRtl, LayoutContext* ctx, size_t bufStart) { 625 LayoutCache& cache = LayoutEngine::getInstance().layoutCache; 626 LayoutCacheKey key(mCollection, ctx->paint, ctx->style, buf, start, count, bufSize, isRtl); 627 bool skipCache = ctx->paint.skipCache(); 628 if (skipCache) { 629 Layout layout; 630 key.doLayout(&layout, ctx, mCollection); 631 appendLayout(&layout, bufStart); 632 } else { 633 Layout* layout = cache.get(key, ctx, mCollection); 634 appendLayout(layout, bufStart); 635 } 636} 637 638static void addFeatures(const string &str, vector<hb_feature_t>* features) { 639 if (!str.size()) 640 return; 641 642 const char* start = str.c_str(); 643 const char* end = start + str.size(); 644 645 while (start < end) { 646 static hb_feature_t feature; 647 const char* p = strchr(start, ','); 648 if (!p) 649 p = end; 650 /* We do not allow setting features on ranges. As such, reject any 651 * setting that has non-universal range. */ 652 if (hb_feature_from_string (start, p - start, &feature) 653 && feature.start == 0 && feature.end == (unsigned int) -1) 654 features->push_back(feature); 655 start = p + 1; 656 } 657} 658 659void Layout::doLayoutRun(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 660 bool isRtl, LayoutContext* ctx) { 661 hb_buffer_t* buffer = LayoutEngine::getInstance().hbBuffer; 662 vector<FontCollection::Run> items; 663 mCollection->itemize(buf + start, count, ctx->style, &items); 664 if (isRtl) { 665 std::reverse(items.begin(), items.end()); 666 } 667 668 vector<hb_feature_t> features; 669 // Disable default-on non-required ligature features if letter-spacing 670 // See http://dev.w3.org/csswg/css-text-3/#letter-spacing-property 671 // "When the effective spacing between two characters is not zero (due to 672 // either justification or a non-zero value of letter-spacing), user agents 673 // should not apply optional ligatures." 674 if (fabs(ctx->paint.letterSpacing) > 0.03) 675 { 676 static const hb_feature_t no_liga = { HB_TAG('l', 'i', 'g', 'a'), 0, 0, ~0u }; 677 static const hb_feature_t no_clig = { HB_TAG('c', 'l', 'i', 'g'), 0, 0, ~0u }; 678 features.push_back(no_liga); 679 features.push_back(no_clig); 680 } 681 addFeatures(ctx->paint.fontFeatureSettings, &features); 682 683 double size = ctx->paint.size; 684 double scaleX = ctx->paint.scaleX; 685 double letterSpace = ctx->paint.letterSpacing * size * scaleX; 686 double letterSpaceHalfLeft; 687 if ((ctx->paint.paintFlags & LinearTextFlag) == 0) { 688 letterSpace = round(letterSpace); 689 letterSpaceHalfLeft = floor(letterSpace * 0.5); 690 } else { 691 letterSpaceHalfLeft = letterSpace * 0.5; 692 } 693 double letterSpaceHalfRight = letterSpace - letterSpaceHalfLeft; 694 695 float x = mAdvance; 696 float y = 0; 697 for (size_t run_ix = 0; run_ix < items.size(); run_ix++) { 698 FontCollection::Run &run = items[run_ix]; 699 if (run.fakedFont.font == NULL) { 700 ALOGE("no font for run starting u+%04x length %d", buf[run.start], run.end - run.start); 701 continue; 702 } 703 int font_ix = findFace(run.fakedFont, ctx); 704 ctx->paint.font = mFaces[font_ix].font; 705 ctx->paint.fakery = mFaces[font_ix].fakery; 706 hb_font_t* hbFont = ctx->hbFonts[font_ix]; 707#ifdef VERBOSE 708 std::cout << "Run " << run_ix << ", font " << font_ix << 709 " [" << run.start << ":" << run.end << "]" << std::endl; 710#endif 711 712 hb_font_set_ppem(hbFont, size * scaleX, size); 713 hb_font_set_scale(hbFont, HBFloatToFixed(size * scaleX), HBFloatToFixed(size)); 714 715 // TODO: if there are multiple scripts within a font in an RTL run, 716 // we need to reorder those runs. This is unlikely with our current 717 // font stack, but should be done for correctness. 718 ssize_t srunend; 719 for (ssize_t srunstart = run.start; srunstart < run.end; srunstart = srunend) { 720 srunend = srunstart; 721 hb_script_t script = getScriptRun(buf + start, run.end, &srunend); 722 723 hb_buffer_clear_contents(buffer); 724 hb_buffer_set_script(buffer, script); 725 hb_buffer_set_direction(buffer, isRtl? HB_DIRECTION_RTL : HB_DIRECTION_LTR); 726 FontLanguage language = ctx->style.getLanguage(); 727 if (language) { 728 string lang = language.getString(); 729 hb_buffer_set_language(buffer, hb_language_from_string(lang.c_str(), -1)); 730 } 731 hb_buffer_add_utf16(buffer, buf, bufSize, srunstart + start, srunend - srunstart); 732 hb_shape(hbFont, buffer, features.empty() ? NULL : &features[0], features.size()); 733 unsigned int numGlyphs; 734 hb_glyph_info_t* info = hb_buffer_get_glyph_infos(buffer, &numGlyphs); 735 hb_glyph_position_t* positions = hb_buffer_get_glyph_positions(buffer, NULL); 736 if (numGlyphs) 737 { 738 mAdvances[info[0].cluster - start] += letterSpaceHalfLeft; 739 x += letterSpaceHalfLeft; 740 } 741 for (unsigned int i = 0; i < numGlyphs; i++) { 742 #ifdef VERBOSE 743 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 << 744 ": " << HBFixedToFloat(positions[i].x_advance) << "; " << positions[i].x_offset << ", " << positions[i].y_offset << std::endl; 745 #endif 746 if (i > 0 && info[i - 1].cluster != info[i].cluster) { 747 mAdvances[info[i - 1].cluster - start] += letterSpaceHalfRight; 748 mAdvances[info[i].cluster - start] += letterSpaceHalfLeft; 749 x += letterSpace; 750 } 751 752 hb_codepoint_t glyph_ix = info[i].codepoint; 753 float xoff = HBFixedToFloat(positions[i].x_offset); 754 float yoff = -HBFixedToFloat(positions[i].y_offset); 755 xoff += yoff * ctx->paint.skewX; 756 LayoutGlyph glyph = {font_ix, glyph_ix, x + xoff, y + yoff}; 757 mGlyphs.push_back(glyph); 758 float xAdvance = HBFixedToFloat(positions[i].x_advance); 759 if ((ctx->paint.paintFlags & LinearTextFlag) == 0) { 760 xAdvance = roundf(xAdvance); 761 } 762 MinikinRect glyphBounds; 763 ctx->paint.font->GetBounds(&glyphBounds, glyph_ix, ctx->paint); 764 glyphBounds.offset(x + xoff, y + yoff); 765 mBounds.join(glyphBounds); 766 mAdvances[info[i].cluster - start] += xAdvance; 767 x += xAdvance; 768 } 769 if (numGlyphs) 770 { 771 mAdvances[info[numGlyphs - 1].cluster - start] += letterSpaceHalfRight; 772 x += letterSpaceHalfRight; 773 } 774 } 775 } 776 mAdvance = x; 777} 778 779void Layout::appendLayout(Layout* src, size_t start) { 780 int fontMapStack[16]; 781 int* fontMap; 782 if (src->mFaces.size() < sizeof(fontMapStack) / sizeof(fontMapStack[0])) { 783 fontMap = fontMapStack; 784 } else { 785 fontMap = new int[src->mFaces.size()]; 786 } 787 for (size_t i = 0; i < src->mFaces.size(); i++) { 788 int font_ix = findFace(src->mFaces[i], NULL); 789 fontMap[i] = font_ix; 790 } 791 int x0 = mAdvance; 792 for (size_t i = 0; i < src->mGlyphs.size(); i++) { 793 LayoutGlyph& srcGlyph = src->mGlyphs[i]; 794 int font_ix = fontMap[srcGlyph.font_ix]; 795 unsigned int glyph_id = srcGlyph.glyph_id; 796 float x = x0 + srcGlyph.x; 797 float y = srcGlyph.y; 798 LayoutGlyph glyph = {font_ix, glyph_id, x, y}; 799 mGlyphs.push_back(glyph); 800 } 801 for (size_t i = 0; i < src->mAdvances.size(); i++) { 802 mAdvances[i + start] = src->mAdvances[i]; 803 } 804 MinikinRect srcBounds(src->mBounds); 805 srcBounds.offset(x0, 0); 806 mBounds.join(srcBounds); 807 mAdvance += src->mAdvance; 808 809 if (fontMap != fontMapStack) { 810 delete[] fontMap; 811 } 812} 813 814void Layout::draw(Bitmap* surface, int x0, int y0, float size) const { 815 /* 816 TODO: redo as MinikinPaint settings 817 if (mProps.hasTag(minikinHinting)) { 818 int hintflags = mProps.value(minikinHinting).getIntValue(); 819 if (hintflags & 1) load_flags |= FT_LOAD_NO_HINTING; 820 if (hintflags & 2) load_flags |= FT_LOAD_NO_AUTOHINT; 821 } 822 */ 823 for (size_t i = 0; i < mGlyphs.size(); i++) { 824 const LayoutGlyph& glyph = mGlyphs[i]; 825 MinikinFont* mf = mFaces[glyph.font_ix].font; 826 MinikinFontFreeType* face = static_cast<MinikinFontFreeType*>(mf); 827 GlyphBitmap glyphBitmap; 828 MinikinPaint paint; 829 paint.size = size; 830 bool ok = face->Render(glyph.glyph_id, paint, &glyphBitmap); 831 printf("glyphBitmap.width=%d, glyphBitmap.height=%d (%d, %d) x=%f, y=%f, ok=%d\n", 832 glyphBitmap.width, glyphBitmap.height, glyphBitmap.left, glyphBitmap.top, glyph.x, glyph.y, ok); 833 if (ok) { 834 surface->drawGlyph(glyphBitmap, 835 x0 + int(floor(glyph.x + 0.5)), y0 + int(floor(glyph.y + 0.5))); 836 } 837 } 838} 839 840size_t Layout::nGlyphs() const { 841 return mGlyphs.size(); 842} 843 844MinikinFont* Layout::getFont(int i) const { 845 const LayoutGlyph& glyph = mGlyphs[i]; 846 return mFaces[glyph.font_ix].font; 847} 848 849FontFakery Layout::getFakery(int i) const { 850 const LayoutGlyph& glyph = mGlyphs[i]; 851 return mFaces[glyph.font_ix].fakery; 852} 853 854unsigned int Layout::getGlyphId(int i) const { 855 const LayoutGlyph& glyph = mGlyphs[i]; 856 return glyph.glyph_id; 857} 858 859float Layout::getX(int i) const { 860 const LayoutGlyph& glyph = mGlyphs[i]; 861 return glyph.x; 862} 863 864float Layout::getY(int i) const { 865 const LayoutGlyph& glyph = mGlyphs[i]; 866 return glyph.y; 867} 868 869float Layout::getAdvance() const { 870 return mAdvance; 871} 872 873void Layout::getAdvances(float* advances) { 874 memcpy(advances, &mAdvances[0], mAdvances.size() * sizeof(float)); 875} 876 877void Layout::getBounds(MinikinRect* bounds) { 878 bounds->set(mBounds); 879} 880 881void Layout::purgeCaches() { 882 AutoMutex _l(gMinikinLock); 883 LayoutCache& layoutCache = LayoutEngine::getInstance().layoutCache; 884 layoutCache.clear(); 885 HbFaceCache& hbCache = LayoutEngine::getInstance().hbFaceCache; 886 hbCache.mCache.clear(); 887} 888 889} // namespace android 890