Layout.cpp revision 448b0fd720d7ba902b9be224a287d08abe3ebea8
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 <string> 21#include <vector> 22#include <algorithm> 23#include <fstream> 24#include <iostream> // for debugging 25#include <stdio.h> // ditto 26 27#include <utils/JenkinsHash.h> 28#include <utils/LruCache.h> 29#include <utils/Singleton.h> 30#include <utils/String16.h> 31 32#include <unicode/ubidi.h> 33#include <hb-icu.h> 34 35#include "MinikinInternal.h" 36#include <minikin/MinikinFontFreeType.h> 37#include <minikin/Layout.h> 38 39using std::string; 40using std::vector; 41 42namespace android { 43 44// TODO: these should move into the header file, but for now we don't want 45// to cause namespace collisions with TextLayout.h 46enum { 47 kBidi_LTR = 0, 48 kBidi_RTL = 1, 49 kBidi_Default_LTR = 2, 50 kBidi_Default_RTL = 3, 51 kBidi_Force_LTR = 4, 52 kBidi_Force_RTL = 5, 53 54 kBidi_Mask = 0x7 55}; 56 57const int kDirection_Mask = 0x1; 58 59// Layout cache datatypes 60 61class LayoutCacheKey { 62public: 63 LayoutCacheKey(const FontCollection* collection, const MinikinPaint& paint, FontStyle style, 64 const uint16_t* chars, size_t start, size_t count, size_t nchars, bool dir) 65 : mStart(start), mCount(count), mId(collection->getId()), mStyle(style), 66 mSize(paint.size), mScaleX(paint.scaleX), mSkewX(paint.skewX), 67 mPaintFlags(paint.paintFlags), mIsRtl(dir) { 68 mText.setTo(chars, nchars); 69 } 70 bool operator==(const LayoutCacheKey &other) const; 71 hash_t hash() const; 72 73 // This is present to avoid having to copy the text more than once. 74 const uint16_t* textBuf() { return mText.string(); } 75private: 76 String16 mText; 77 size_t mStart; 78 size_t mCount; 79 uint32_t mId; // for the font collection 80 FontStyle mStyle; 81 float mSize; 82 float mScaleX; 83 float mSkewX; 84 int mPaintFlags; 85 bool mIsRtl; 86 // Note: any fields added to MinikinPaint must also be reflected here. 87 // TODO: language matching (possibly integrate into style) 88}; 89 90class LayoutCache : private OnEntryRemoved<LayoutCacheKey, Layout*> { 91public: 92 LayoutCache() : mCache(kMaxEntries) { 93 mCache.setOnEntryRemovedListener(this); 94 } 95 96 // callback for OnEntryRemoved 97 void operator()(LayoutCacheKey& key, Layout*& value) { 98 delete value; 99 } 100 101 LruCache<LayoutCacheKey, Layout*> mCache; 102private: 103 //static const size_t kMaxEntries = LruCache<LayoutCacheKey, Layout*>::kUnlimitedCapacity; 104 105 // TODO: eviction based on memory footprint; for now, we just use a constant 106 // number of strings 107 static const size_t kMaxEntries = 5000; 108}; 109 110class HbFaceCache : private OnEntryRemoved<int32_t, hb_face_t*> { 111public: 112 HbFaceCache() : mCache(kMaxEntries) { 113 mCache.setOnEntryRemovedListener(this); 114 } 115 116 // callback for OnEntryRemoved 117 void operator()(int32_t& key, hb_face_t*& value) { 118 hb_face_destroy(value); 119 } 120 121 LruCache<int32_t, hb_face_t*> mCache; 122private: 123 static const size_t kMaxEntries = 100; 124}; 125 126class LayoutEngine : public Singleton<LayoutEngine> { 127public: 128 LayoutEngine() { 129 hbBuffer = hb_buffer_create(); 130 } 131 132 hb_buffer_t* hbBuffer; 133 LayoutCache layoutCache; 134 HbFaceCache hbFaceCache; 135}; 136 137ANDROID_SINGLETON_STATIC_INSTANCE(LayoutEngine); 138 139bool LayoutCacheKey::operator==(const LayoutCacheKey& other) const { 140 return mId == other.mId 141 && mStart == other.mStart 142 && mCount == other.mCount 143 && mStyle == other.mStyle 144 && mSize == other.mSize 145 && mScaleX == other.mScaleX 146 && mSkewX == other.mSkewX 147 && mPaintFlags == other.mPaintFlags 148 && mIsRtl == other.mIsRtl 149 && mText == other.mText; 150} 151 152hash_t LayoutCacheKey::hash() const { 153 uint32_t hash = JenkinsHashMix(0, mId); 154 hash = JenkinsHashMix(hash, mStart); 155 hash = JenkinsHashMix(hash, mCount); 156 hash = JenkinsHashMix(hash, hash_type(mStyle)); 157 hash = JenkinsHashMix(hash, hash_type(mSize)); 158 hash = JenkinsHashMix(hash, hash_type(mScaleX)); 159 hash = JenkinsHashMix(hash, hash_type(mSkewX)); 160 hash = JenkinsHashMix(hash, hash_type(mPaintFlags)); 161 hash = JenkinsHashMix(hash, hash_type(mIsRtl)); 162 hash = JenkinsHashMixShorts(hash, mText.string(), mText.size()); 163 return JenkinsHashWhiten(hash); 164} 165 166struct LayoutContext { 167 MinikinPaint paint; 168 FontStyle style; 169 CssProperties props; 170 std::vector<hb_font_t*> hbFonts; // parallel to mFaces 171}; 172 173hash_t hash_type(const LayoutCacheKey& key) { 174 return key.hash(); 175} 176 177Bitmap::Bitmap(int width, int height) : width(width), height(height) { 178 buf = new uint8_t[width * height](); 179} 180 181Bitmap::~Bitmap() { 182 delete[] buf; 183} 184 185void Bitmap::writePnm(std::ofstream &o) const { 186 o << "P5" << std::endl; 187 o << width << " " << height << std::endl; 188 o << "255" << std::endl; 189 o.write((const char *)buf, width * height); 190 o.close(); 191} 192 193void Bitmap::drawGlyph(const GlyphBitmap& bitmap, int x, int y) { 194 int bmw = bitmap.width; 195 int bmh = bitmap.height; 196 x += bitmap.left; 197 y -= bitmap.top; 198 int x0 = std::max(0, x); 199 int x1 = std::min(width, x + bmw); 200 int y0 = std::max(0, y); 201 int y1 = std::min(height, y + bmh); 202 const unsigned char* src = bitmap.buffer + (y0 - y) * bmw + (x0 - x); 203 uint8_t* dst = buf + y0 * width; 204 for (int yy = y0; yy < y1; yy++) { 205 for (int xx = x0; xx < x1; xx++) { 206 int pixel = (int)dst[xx] + (int)src[xx - x]; 207 pixel = pixel > 0xff ? 0xff : pixel; 208 dst[xx] = pixel; 209 } 210 src += bmw; 211 dst += width; 212 } 213} 214 215void MinikinRect::join(const MinikinRect& r) { 216 if (isEmpty()) { 217 set(r); 218 } else if (!r.isEmpty()) { 219 mLeft = std::min(mLeft, r.mLeft); 220 mTop = std::min(mTop, r.mTop); 221 mRight = std::max(mRight, r.mRight); 222 mBottom = std::max(mBottom, r.mBottom); 223 } 224} 225 226// TODO: the actual initialization is deferred, maybe make this explicit 227void Layout::init() { 228} 229 230void Layout::setFontCollection(const FontCollection* collection) { 231 mCollection = collection; 232} 233 234hb_blob_t* referenceTable(hb_face_t* face, hb_tag_t tag, void* userData) { 235 MinikinFont* font = reinterpret_cast<MinikinFont*>(userData); 236 size_t length = 0; 237 bool ok = font->GetTable(tag, NULL, &length); 238 if (!ok) { 239 return 0; 240 } 241 char* buffer = reinterpret_cast<char*>(malloc(length)); 242 if (!buffer) { 243 return 0; 244 } 245 ok = font->GetTable(tag, reinterpret_cast<uint8_t*>(buffer), &length); 246 printf("referenceTable %c%c%c%c length=%d %d\n", 247 (tag >>24) & 0xff, (tag>>16)&0xff, (tag>>8)&0xff, tag&0xff, length, ok); 248 if (!ok) { 249 free(buffer); 250 return 0; 251 } 252 return hb_blob_create(const_cast<char*>(buffer), length, 253 HB_MEMORY_MODE_WRITABLE, buffer, free); 254} 255 256static hb_bool_t harfbuzzGetGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData) 257{ 258 MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData); 259 MinikinFont* font = paint->font; 260 uint32_t glyph_id; 261 bool ok = font->GetGlyph(unicode, &glyph_id); 262 if (ok) { 263 *glyph = glyph_id; 264 } 265 return ok; 266} 267 268static hb_position_t harfbuzzGetGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData) 269{ 270 MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData); 271 MinikinFont* font = paint->font; 272 float advance = font->GetHorizontalAdvance(glyph, *paint); 273 return 256 * advance + 0.5; 274} 275 276static hb_bool_t harfbuzzGetGlyphHorizontalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData) 277{ 278 // Just return true, following the way that Harfbuzz-FreeType 279 // implementation does. 280 return true; 281} 282 283hb_font_funcs_t* getHbFontFuncs() { 284 static hb_font_funcs_t* hbFontFuncs = 0; 285 286 if (hbFontFuncs == 0) { 287 hbFontFuncs = hb_font_funcs_create(); 288 hb_font_funcs_set_glyph_func(hbFontFuncs, harfbuzzGetGlyph, 0, 0); 289 hb_font_funcs_set_glyph_h_advance_func(hbFontFuncs, harfbuzzGetGlyphHorizontalAdvance, 0, 0); 290 hb_font_funcs_set_glyph_h_origin_func(hbFontFuncs, harfbuzzGetGlyphHorizontalOrigin, 0, 0); 291 hb_font_funcs_make_immutable(hbFontFuncs); 292 } 293 return hbFontFuncs; 294} 295 296static hb_face_t* getHbFace(MinikinFont* minikinFont) { 297 HbFaceCache& cache = LayoutEngine::getInstance().hbFaceCache; 298 int32_t fontId = minikinFont->GetUniqueId(); 299 hb_face_t* face = cache.mCache.get(fontId); 300 if (face == NULL) { 301 face = hb_face_create_for_tables(referenceTable, minikinFont, NULL); 302 cache.mCache.put(fontId, face); 303 } 304 return face; 305} 306 307static hb_font_t* create_hb_font(MinikinFont* minikinFont, MinikinPaint* minikinPaint) { 308 hb_face_t* face = getHbFace(minikinFont); 309 hb_font_t* font = hb_font_create(face); 310 hb_font_set_funcs(font, getHbFontFuncs(), minikinPaint, 0); 311 return font; 312} 313 314static float HBFixedToFloat(hb_position_t v) 315{ 316 return scalbnf (v, -8); 317} 318 319static hb_position_t HBFloatToFixed(float v) 320{ 321 return scalbnf (v, +8); 322} 323 324void Layout::dump() const { 325 for (size_t i = 0; i < mGlyphs.size(); i++) { 326 const LayoutGlyph& glyph = mGlyphs[i]; 327 std::cout << glyph.glyph_id << ": " << glyph.x << ", " << glyph.y << std::endl; 328 } 329} 330 331int Layout::findFace(MinikinFont* face, LayoutContext* ctx) { 332 unsigned int ix; 333 for (ix = 0; ix < mFaces.size(); ix++) { 334 if (mFaces[ix] == face) { 335 return ix; 336 } 337 } 338 mFaces.push_back(face); 339 // Note: ctx == NULL means we're copying from the cache, no need to create 340 // corresponding hb_font object. 341 if (ctx != NULL) { 342 hb_font_t* font = create_hb_font(face, &ctx->paint); 343 ctx->hbFonts.push_back(font); 344 } 345 return ix; 346} 347 348static FontStyle styleFromCss(const CssProperties &props) { 349 int weight = 4; 350 if (props.hasTag(fontWeight)) { 351 weight = props.value(fontWeight).getIntValue() / 100; 352 } 353 bool italic = false; 354 if (props.hasTag(fontStyle)) { 355 italic = props.value(fontStyle).getIntValue() != 0; 356 } 357 FontLanguage lang; 358 if (props.hasTag(cssLang)) { 359 string langStr = props.value(cssLang).getStringValue(); 360 lang = FontLanguage(langStr.c_str(), langStr.size()); 361 } 362 int variant = 0; 363 if (props.hasTag(minikinVariant)) { 364 variant = props.value(minikinVariant).getIntValue(); 365 } 366 return FontStyle(lang, variant, weight, italic); 367} 368 369static hb_script_t codePointToScript(hb_codepoint_t codepoint) { 370 static hb_unicode_funcs_t* u = 0; 371 if (!u) { 372 u = hb_icu_get_unicode_funcs(); 373 } 374 return hb_unicode_script(u, codepoint); 375} 376 377static hb_codepoint_t decodeUtf16(const uint16_t* chars, size_t len, ssize_t* iter) { 378 const uint16_t v = chars[(*iter)++]; 379 // test whether v in (0xd800..0xdfff), lead or trail surrogate 380 if ((v & 0xf800) == 0xd800) { 381 // test whether v in (0xd800..0xdbff), lead surrogate 382 if (size_t(*iter) < len && (v & 0xfc00) == 0xd800) { 383 const uint16_t v2 = chars[(*iter)++]; 384 // test whether v2 in (0xdc00..0xdfff), trail surrogate 385 if ((v2 & 0xfc00) == 0xdc00) { 386 // (0xd800 0xdc00) in utf-16 maps to 0x10000 in ucs-32 387 const hb_codepoint_t delta = (0xd800 << 10) + 0xdc00 - 0x10000; 388 return (((hb_codepoint_t)v) << 10) + v2 - delta; 389 } 390 (*iter) -= 2; 391 return ~0u; 392 } else { 393 (*iter)--; 394 return ~0u; 395 } 396 } else { 397 return v; 398 } 399} 400 401static hb_script_t getScriptRun(const uint16_t* chars, size_t len, ssize_t* iter) { 402 if (size_t(*iter) == len) { 403 return HB_SCRIPT_UNKNOWN; 404 } 405 uint32_t cp = decodeUtf16(chars, len, iter); 406 hb_script_t current_script = codePointToScript(cp); 407 for (;;) { 408 if (size_t(*iter) == len) 409 break; 410 const ssize_t prev_iter = *iter; 411 cp = decodeUtf16(chars, len, iter); 412 const hb_script_t script = codePointToScript(cp); 413 if (script != current_script) { 414 if (current_script == HB_SCRIPT_INHERITED || 415 current_script == HB_SCRIPT_COMMON) { 416 current_script = script; 417 } else if (script == HB_SCRIPT_INHERITED || 418 script == HB_SCRIPT_COMMON) { 419 continue; 420 } else { 421 *iter = prev_iter; 422 break; 423 } 424 } 425 } 426 if (current_script == HB_SCRIPT_INHERITED) { 427 current_script = HB_SCRIPT_COMMON; 428 } 429 430 return current_script; 431} 432 433/** 434 * For the purpose of layout, a word break is a boundary with no 435 * kerning or complex script processing. This is necessarily a 436 * heuristic, but should be accurate most of the time. 437 */ 438static bool isWordBreak(int c) { 439 if (c == ' ' || (c >= 0x2000 && c <= 0x200a) || c == 0x3000) { 440 // spaces 441 return true; 442 } 443 if ((c >= 0x3400 && c <= 0x9fff)) { 444 // CJK ideographs (and yijing hexagram symbols) 445 return true; 446 } 447 // Note: kana is not included, as sophisticated fonts may kern kana 448 return false; 449} 450 451/** 452 * Return offset of previous word break. It is either < offset or == 0. 453 */ 454static size_t getPrevWordBreak(const uint16_t* chars, size_t offset) { 455 if (offset == 0) return 0; 456 if (isWordBreak(chars[offset - 1])) { 457 return offset - 1; 458 } 459 for (size_t i = offset - 1; i > 0; i--) { 460 if (isWordBreak(chars[i - 1])) { 461 return i; 462 } 463 } 464 return 0; 465} 466 467/** 468 * Return offset of next word break. It is either > offset or == len. 469 */ 470static size_t getNextWordBreak(const uint16_t* chars, size_t offset, size_t len) { 471 if (offset >= len) return len; 472 if (isWordBreak(chars[offset])) { 473 return offset + 1; 474 } 475 for (size_t i = offset + 1; i < len; i++) { 476 if (isWordBreak(chars[i])) { 477 return i; 478 } 479 } 480 return len; 481} 482 483// deprecated API, to avoid breaking client 484void Layout::doLayout(const uint16_t* buf, size_t nchars) { 485 doLayout(buf, 0, nchars, nchars, mCssString); 486} 487 488// TODO: use some standard implementation 489template<typename T> 490static T mymin(const T& a, const T& b) { 491 return a < b ? a : b; 492} 493 494template<typename T> 495static T mymax(const T& a, const T& b) { 496 return a > b ? a : b; 497} 498 499static void clearHbFonts(LayoutContext* ctx) { 500 for (size_t i = 0; i < ctx->hbFonts.size(); i++) { 501 hb_font_destroy(ctx->hbFonts[i]); 502 } 503 ctx->hbFonts.clear(); 504} 505 506// TODO: API should probably take context 507void Layout::doLayout(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 508 const string& css) { 509 AutoMutex _l(gMinikinLock); 510 LayoutContext ctx; 511 512 ctx.props.parse(css); 513 ctx.style = styleFromCss(ctx.props); 514 515 ctx.paint.size = ctx.props.value(fontSize).getFloatValue(); 516 ctx.paint.scaleX = ctx.props.hasTag(fontScaleX) 517 ? ctx.props.value(fontScaleX).getFloatValue() : 1; 518 ctx.paint.skewX = ctx.props.hasTag(fontSkewX) 519 ? ctx.props.value(fontSkewX).getFloatValue() : 0; 520 ctx.paint.paintFlags = ctx.props.hasTag(paintFlags) 521 ?ctx.props.value(paintFlags).getIntValue() : 0; 522 int bidiFlags = ctx.props.hasTag(minikinBidi) ? ctx.props.value(minikinBidi).getIntValue() : 0; 523 bool isRtl = (bidiFlags & kDirection_Mask) != 0; 524 bool doSingleRun = true; 525 526 mGlyphs.clear(); 527 mFaces.clear(); 528 mBounds.setEmpty(); 529 mAdvances.clear(); 530 mAdvances.resize(count, 0); 531 mAdvance = 0; 532 if (!(bidiFlags == kBidi_Force_LTR || bidiFlags == kBidi_Force_RTL)) { 533 UBiDi* bidi = ubidi_open(); 534 if (bidi) { 535 UErrorCode status = U_ZERO_ERROR; 536 UBiDiLevel bidiReq = bidiFlags; 537 if (bidiFlags == kBidi_Default_LTR) { 538 bidiReq = UBIDI_DEFAULT_LTR; 539 } else if (bidiFlags == kBidi_Default_RTL) { 540 bidiReq = UBIDI_DEFAULT_RTL; 541 } 542 ubidi_setPara(bidi, buf, bufSize, bidiReq, NULL, &status); 543 if (U_SUCCESS(status)) { 544 int paraDir = ubidi_getParaLevel(bidi) & kDirection_Mask; 545 ssize_t rc = ubidi_countRuns(bidi, &status); 546 if (!U_SUCCESS(status) || rc < 0) { 547 ALOGW("error counting bidi runs, status = %d", status); 548 } 549 if (!U_SUCCESS(status) || rc <= 1) { 550 isRtl = (paraDir == kBidi_RTL); 551 } else { 552 doSingleRun = false; 553 // iterate through runs 554 for (ssize_t i = 0; i < (ssize_t)rc; i++) { 555 int32_t startRun = -1; 556 int32_t lengthRun = -1; 557 UBiDiDirection runDir = ubidi_getVisualRun(bidi, i, &startRun, &lengthRun); 558 if (startRun == -1 || lengthRun == -1) { 559 ALOGE("invalid visual run"); 560 // skip the invalid run 561 continue; 562 } 563 isRtl = (runDir == UBIDI_RTL); 564 // TODO: min/max with context 565 doLayoutRunCached(buf, startRun, lengthRun, bufSize, isRtl, &ctx); 566 } 567 } 568 } else { 569 ALOGE("error calling ubidi_setPara, status = %d", status); 570 } 571 ubidi_close(bidi); 572 } else { 573 ALOGE("error creating bidi object"); 574 } 575 } 576 if (doSingleRun) { 577 doLayoutRunCached(buf, start, count, bufSize, isRtl, &ctx); 578 } 579 clearHbFonts(&ctx); 580} 581 582void Layout::doLayoutRunCached(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 583 bool isRtl, LayoutContext* ctx) { 584 if (!isRtl) { 585 // left to right 586 size_t wordstart = start == bufSize ? start : getPrevWordBreak(buf, start + 1); 587 size_t wordend; 588 for (size_t iter = start; iter < start + count; iter = wordend) { 589 wordend = getNextWordBreak(buf, iter, bufSize); 590 size_t wordcount = mymin(start + count, wordend) - iter; 591 doLayoutWord(buf + wordstart, iter - wordstart, wordcount, wordend - wordstart, 592 isRtl, ctx, iter); 593 wordstart = wordend; 594 } 595 } else { 596 // right to left 597 size_t wordstart; 598 size_t end = start + count; 599 size_t wordend = end == 0 ? 0 : getNextWordBreak(buf, end - 1, bufSize); 600 for (size_t iter = end; iter > start; iter = wordstart) { 601 wordstart = getPrevWordBreak(buf, iter); 602 size_t bufStart = mymax(start, wordstart); 603 doLayoutWord(buf + wordstart, bufStart - wordstart, iter - bufStart, 604 wordend - wordstart, isRtl, ctx, bufStart); 605 wordend = wordstart; 606 } 607 } 608} 609 610void Layout::doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 611 bool isRtl, LayoutContext* ctx, size_t bufStart) { 612 LayoutCache& cache = LayoutEngine::getInstance().layoutCache; 613 LayoutCacheKey key(mCollection, ctx->paint, ctx->style, buf, start, count, bufSize, isRtl); 614 Layout* value = cache.mCache.get(key); 615 if (value == NULL) { 616 value = new Layout(); 617 value->setFontCollection(mCollection); 618 value->mAdvances.resize(count, 0); 619 clearHbFonts(ctx); 620 // Note: we do the layout from the copy stored in the key, in case a 621 // badly-behaved client is mutating the buffer in a separate thread. 622 value->doLayoutRun(key.textBuf(), start, count, bufSize, isRtl, ctx); 623 } 624 appendLayout(value, bufStart); 625 cache.mCache.put(key, value); 626} 627 628void Layout::doLayoutRun(const uint16_t* buf, size_t start, size_t count, size_t bufSize, 629 bool isRtl, LayoutContext* ctx) { 630 hb_buffer_t* buffer = LayoutEngine::getInstance().hbBuffer; 631 vector<FontCollection::Run> items; 632 mCollection->itemize(buf + start, count, ctx->style, &items); 633 if (isRtl) { 634 std::reverse(items.begin(), items.end()); 635 } 636 637 float x = mAdvance; 638 float y = 0; 639 for (size_t run_ix = 0; run_ix < items.size(); run_ix++) { 640 FontCollection::Run &run = items[run_ix]; 641 if (run.font == NULL) { 642 ALOGE("no font for run starting u+%04x length %d", buf[run.start], run.end - run.start); 643 continue; 644 } 645 int font_ix = findFace(run.font, ctx); 646 ctx->paint.font = mFaces[font_ix]; 647 hb_font_t* hbFont = ctx->hbFonts[font_ix]; 648#ifdef VERBOSE 649 std::cout << "Run " << run_ix << ", font " << font_ix << 650 " [" << run.start << ":" << run.end << "]" << std::endl; 651#endif 652 double size = ctx->paint.size; 653 double scaleX = ctx->paint.scaleX; 654 hb_font_set_ppem(hbFont, size * scaleX, size); 655 hb_font_set_scale(hbFont, HBFloatToFixed(size * scaleX), HBFloatToFixed(size)); 656 657 // TODO: if there are multiple scripts within a font in an RTL run, 658 // we need to reorder those runs. This is unlikely with our current 659 // font stack, but should be done for correctness. 660 ssize_t srunend; 661 for (ssize_t srunstart = run.start; srunstart < run.end; srunstart = srunend) { 662 srunend = srunstart; 663 hb_script_t script = getScriptRun(buf + start, run.end, &srunend); 664 665 hb_buffer_reset(buffer); 666 hb_buffer_set_script(buffer, script); 667 hb_buffer_set_direction(buffer, isRtl? HB_DIRECTION_RTL : HB_DIRECTION_LTR); 668 if (ctx->props.hasTag(cssLang)) { 669 string lang = ctx->props.value(cssLang).getStringValue(); 670 hb_buffer_set_language(buffer, hb_language_from_string(lang.c_str(), -1)); 671 } 672 hb_buffer_add_utf16(buffer, buf, bufSize, srunstart + start, srunend - srunstart); 673 hb_shape(hbFont, buffer, NULL, 0); 674 unsigned int numGlyphs; 675 hb_glyph_info_t* info = hb_buffer_get_glyph_infos(buffer, &numGlyphs); 676 hb_glyph_position_t* positions = hb_buffer_get_glyph_positions(buffer, NULL); 677 for (unsigned int i = 0; i < numGlyphs; i++) { 678 #ifdef VERBOSE 679 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 << 680 ": " << HBFixedToFloat(positions[i].x_advance) << "; " << positions[i].x_offset << ", " << positions[i].y_offset << std::endl; 681 #endif 682 hb_codepoint_t glyph_ix = info[i].codepoint; 683 float xoff = HBFixedToFloat(positions[i].x_offset); 684 float yoff = -HBFixedToFloat(positions[i].y_offset); 685 xoff += yoff * ctx->paint.skewX; 686 LayoutGlyph glyph = {font_ix, glyph_ix, x + xoff, y + yoff}; 687 mGlyphs.push_back(glyph); 688 float xAdvance = HBFixedToFloat(positions[i].x_advance); 689 MinikinRect glyphBounds; 690 ctx->paint.font->GetBounds(&glyphBounds, glyph_ix, ctx->paint); 691 glyphBounds.offset(x + xoff, y + yoff); 692 mBounds.join(glyphBounds); 693 size_t cluster = info[i].cluster - start; 694 mAdvances[cluster] += xAdvance; 695 x += xAdvance; 696 } 697 } 698 } 699 mAdvance = x; 700} 701 702void Layout::appendLayout(Layout* src, size_t start) { 703 // Note: size==1 is by far most common, should have specialized vector for this 704 std::vector<int> fontMap; 705 for (size_t i = 0; i < src->mFaces.size(); i++) { 706 int font_ix = findFace(src->mFaces[i], NULL); 707 fontMap.push_back(font_ix); 708 } 709 int x0 = mAdvance; 710 for (size_t i = 0; i < src->mGlyphs.size(); i++) { 711 LayoutGlyph& srcGlyph = src->mGlyphs[i]; 712 int font_ix = fontMap[srcGlyph.font_ix]; 713 unsigned int glyph_id = srcGlyph.glyph_id; 714 float x = x0 + srcGlyph.x; 715 float y = srcGlyph.y; 716 LayoutGlyph glyph = {font_ix, glyph_id, x, y}; 717 mGlyphs.push_back(glyph); 718 } 719 for (size_t i = 0; i < src->mAdvances.size(); i++) { 720 mAdvances[i + start] = src->mAdvances[i]; 721 } 722 MinikinRect srcBounds(src->mBounds); 723 srcBounds.offset(x0, 0); 724 mBounds.join(srcBounds); 725 mAdvance += src->mAdvance; 726} 727 728void Layout::draw(Bitmap* surface, int x0, int y0, float size) const { 729 /* 730 TODO: redo as MinikinPaint settings 731 if (mProps.hasTag(minikinHinting)) { 732 int hintflags = mProps.value(minikinHinting).getIntValue(); 733 if (hintflags & 1) load_flags |= FT_LOAD_NO_HINTING; 734 if (hintflags & 2) load_flags |= FT_LOAD_NO_AUTOHINT; 735 } 736 */ 737 for (size_t i = 0; i < mGlyphs.size(); i++) { 738 const LayoutGlyph& glyph = mGlyphs[i]; 739 MinikinFont* mf = mFaces[glyph.font_ix]; 740 MinikinFontFreeType* face = static_cast<MinikinFontFreeType*>(mf); 741 GlyphBitmap glyphBitmap; 742 MinikinPaint paint; 743 paint.size = size; 744 bool ok = face->Render(glyph.glyph_id, paint, &glyphBitmap); 745 printf("glyphBitmap.width=%d, glyphBitmap.height=%d (%d, %d) x=%f, y=%f, ok=%d\n", 746 glyphBitmap.width, glyphBitmap.height, glyphBitmap.left, glyphBitmap.top, glyph.x, glyph.y, ok); 747 if (ok) { 748 surface->drawGlyph(glyphBitmap, 749 x0 + int(floor(glyph.x + 0.5)), y0 + int(floor(glyph.y + 0.5))); 750 } 751 } 752} 753 754void Layout::setProperties(const string& css) { 755 mCssString = css; 756} 757 758size_t Layout::nGlyphs() const { 759 return mGlyphs.size(); 760} 761 762MinikinFont* Layout::getFont(int i) const { 763 const LayoutGlyph& glyph = mGlyphs[i]; 764 return mFaces[glyph.font_ix]; 765} 766 767unsigned int Layout::getGlyphId(int i) const { 768 const LayoutGlyph& glyph = mGlyphs[i]; 769 return glyph.glyph_id; 770} 771 772float Layout::getX(int i) const { 773 const LayoutGlyph& glyph = mGlyphs[i]; 774 return glyph.x; 775} 776 777float Layout::getY(int i) const { 778 const LayoutGlyph& glyph = mGlyphs[i]; 779 return glyph.y; 780} 781 782float Layout::getAdvance() const { 783 return mAdvance; 784} 785 786void Layout::getAdvances(float* advances) { 787 memcpy(advances, &mAdvances[0], mAdvances.size() * sizeof(float)); 788} 789 790void Layout::getBounds(MinikinRect* bounds) { 791 bounds->set(mBounds); 792} 793 794} // namespace android 795