TextLayoutCache.cpp revision 5beeda08a7bd300ec22daaa9ae4e2d02a8c121ad 
1/*
2 * Copyright (C) 2011 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 "TextLayoutCache"
18
19#include "TextLayoutCache.h"
20#include "TextLayout.h"
21
22extern "C" {
23  #include "harfbuzz-unicode.h"
24}
25
26namespace android {
27
28//--------------------------------------------------------------------------------------------------
29#if USE_TEXT_LAYOUT_CACHE
30    ANDROID_SINGLETON_STATIC_INSTANCE(TextLayoutCache);
31#endif
32//--------------------------------------------------------------------------------------------------
33
34TextLayoutCache::TextLayoutCache() :
35        mCache(GenerationCache<TextLayoutCacheKey, sp<TextLayoutCacheValue> >::kUnlimitedCapacity),
36        mSize(0), mMaxSize(MB(DEFAULT_TEXT_LAYOUT_CACHE_SIZE_IN_MB)),
37        mCacheHitCount(0), mNanosecondsSaved(0) {
38    init();
39}
40
41TextLayoutCache::~TextLayoutCache() {
42    mCache.clear();
43}
44
45void TextLayoutCache::init() {
46    mCache.setOnEntryRemovedListener(this);
47
48    mDebugLevel = readRtlDebugLevel();
49    mDebugEnabled = mDebugLevel & kRtlDebugCaches;
50    LOGD("Using debug level: %d - Debug Enabled: %d", mDebugLevel, mDebugEnabled);
51
52    mCacheStartTime = systemTime(SYSTEM_TIME_MONOTONIC);
53
54    if (mDebugEnabled) {
55        LOGD("Initialization is done - Start time: %lld", mCacheStartTime);
56    }
57
58    mInitialized = true;
59}
60
61/*
62 * Size management
63 */
64
65uint32_t TextLayoutCache::getSize() {
66    return mSize;
67}
68
69uint32_t TextLayoutCache::getMaxSize() {
70    return mMaxSize;
71}
72
73void TextLayoutCache::setMaxSize(uint32_t maxSize) {
74    mMaxSize = maxSize;
75    removeOldests();
76}
77
78void TextLayoutCache::removeOldests() {
79    while (mSize > mMaxSize) {
80        mCache.removeOldest();
81    }
82}
83
84/**
85 *  Callbacks
86 */
87void TextLayoutCache::operator()(TextLayoutCacheKey& text, sp<TextLayoutCacheValue>& desc) {
88    if (desc != NULL) {
89        size_t totalSizeToDelete = text.getSize() + desc->getSize();
90        mSize -= totalSizeToDelete;
91        if (mDebugEnabled) {
92            LOGD("Cache value deleted, size = %d", totalSizeToDelete);
93        }
94        desc.clear();
95    }
96}
97
98/*
99 * Cache clearing
100 */
101void TextLayoutCache::clear() {
102    mCache.clear();
103}
104
105/*
106 * Caching
107 */
108sp<TextLayoutCacheValue> TextLayoutCache::getValue(SkPaint* paint,
109            const jchar* text, jint start, jint count, jint contextCount, jint dirFlags) {
110    AutoMutex _l(mLock);
111    nsecs_t startTime = 0;
112    if (mDebugEnabled) {
113        startTime = systemTime(SYSTEM_TIME_MONOTONIC);
114    }
115
116    // Create the key
117    TextLayoutCacheKey key(paint, text, start, count, contextCount, dirFlags);
118
119    // Get value from cache if possible
120    sp<TextLayoutCacheValue> value = mCache.get(key);
121
122    // Value not found for the key, we need to add a new value in the cache
123    if (value == NULL) {
124        if (mDebugEnabled) {
125            startTime = systemTime(SYSTEM_TIME_MONOTONIC);
126        }
127
128        value = new TextLayoutCacheValue();
129
130        // Compute advances and store them
131        value->computeValues(paint, text, start, count, contextCount, dirFlags);
132
133        nsecs_t endTime = systemTime(SYSTEM_TIME_MONOTONIC);
134
135        // Don't bother to add in the cache if the entry is too big
136        size_t size = key.getSize() + value->getSize();
137        if (size <= mMaxSize) {
138            // Cleanup to make some room if needed
139            if (mSize + size > mMaxSize) {
140                if (mDebugEnabled) {
141                    LOGD("Need to clean some entries for making some room for a new entry");
142                }
143                while (mSize + size > mMaxSize) {
144                    // This will call the callback
145                    mCache.removeOldest();
146                }
147            }
148
149            // Update current cache size
150            mSize += size;
151
152            // Copy the text when we insert the new entry
153            key.internalTextCopy();
154            mCache.put(key, value);
155
156            if (mDebugEnabled) {
157                // Update timing information for statistics
158                value->setElapsedTime(endTime - startTime);
159
160                LOGD("CACHE MISS: Added entry with "
161                        "count=%d, entry size %d bytes, remaining space %d bytes"
162                        " - Compute time in nanos: %d - Text='%s' ",
163                        count, size, mMaxSize - mSize, value->getElapsedTime(),
164                        String8(text, count).string());
165            }
166        } else {
167            if (mDebugEnabled) {
168                LOGD("CACHE MISS: Calculated but not storing entry because it is too big "
169                        "with start=%d count=%d contextCount=%d, "
170                        "entry size %d bytes, remaining space %d bytes"
171                        " - Compute time in nanos: %lld - Text='%s'",
172                        start, count, contextCount, size, mMaxSize - mSize, endTime,
173                        String8(text, count).string());
174            }
175            value.clear();
176        }
177    } else {
178        // This is a cache hit, just log timestamp and user infos
179        if (mDebugEnabled) {
180            nsecs_t elapsedTimeThruCacheGet = systemTime(SYSTEM_TIME_MONOTONIC) - startTime;
181            mNanosecondsSaved += (value->getElapsedTime() - elapsedTimeThruCacheGet);
182            ++mCacheHitCount;
183
184            if (value->getElapsedTime() > 0) {
185                float deltaPercent = 100 * ((value->getElapsedTime() - elapsedTimeThruCacheGet)
186                        / ((float)value->getElapsedTime()));
187                LOGD("CACHE HIT #%d with start=%d count=%d contextCount=%d"
188                        "- Compute time in nanos: %d - "
189                        "Cache get time in nanos: %lld - Gain in percent: %2.2f - Text='%s' ",
190                        mCacheHitCount, start, count, contextCount,
191                        value->getElapsedTime(), elapsedTimeThruCacheGet, deltaPercent,
192                        String8(text, count).string());
193            }
194            if (mCacheHitCount % DEFAULT_DUMP_STATS_CACHE_HIT_INTERVAL == 0) {
195                dumpCacheStats();
196            }
197        }
198    }
199    return value;
200}
201
202void TextLayoutCache::dumpCacheStats() {
203    float remainingPercent = 100 * ((mMaxSize - mSize) / ((float)mMaxSize));
204    float timeRunningInSec = (systemTime(SYSTEM_TIME_MONOTONIC) - mCacheStartTime) / 1000000000;
205    LOGD("------------------------------------------------");
206    LOGD("Cache stats");
207    LOGD("------------------------------------------------");
208    LOGD("pid       : %d", getpid());
209    LOGD("running   : %.0f seconds", timeRunningInSec);
210    LOGD("entries   : %d", mCache.size());
211    LOGD("size      : %d bytes", mMaxSize);
212    LOGD("remaining : %d bytes or %2.2f percent", mMaxSize - mSize, remainingPercent);
213    LOGD("hits      : %d", mCacheHitCount);
214    LOGD("saved     : %lld milliseconds", mNanosecondsSaved / 1000000);
215    LOGD("------------------------------------------------");
216}
217
218/**
219 * TextLayoutCacheKey
220 */
221TextLayoutCacheKey::TextLayoutCacheKey(): text(NULL), start(0), count(0), contextCount(0),
222        dirFlags(0), typeface(NULL), textSize(0), textSkewX(0), textScaleX(0), flags(0),
223        hinting(SkPaint::kNo_Hinting)  {
224}
225
226TextLayoutCacheKey::TextLayoutCacheKey(const SkPaint* paint, const UChar* text,
227        size_t start, size_t count, size_t contextCount, int dirFlags) :
228            text(text), start(start), count(count), contextCount(contextCount),
229            dirFlags(dirFlags) {
230    typeface = paint->getTypeface();
231    textSize = paint->getTextSize();
232    textSkewX = paint->getTextSkewX();
233    textScaleX = paint->getTextScaleX();
234    flags = paint->getFlags();
235    hinting = paint->getHinting();
236}
237
238TextLayoutCacheKey::TextLayoutCacheKey(const TextLayoutCacheKey& other) :
239        text(NULL),
240        textCopy(other.textCopy),
241        start(other.start),
242        count(other.count),
243        contextCount(other.contextCount),
244        dirFlags(other.dirFlags),
245        typeface(other.typeface),
246        textSize(other.textSize),
247        textSkewX(other.textSkewX),
248        textScaleX(other.textScaleX),
249        flags(other.flags),
250        hinting(other.hinting) {
251    if (other.text) {
252        textCopy.setTo(other.text);
253    }
254}
255
256int TextLayoutCacheKey::compare(const TextLayoutCacheKey& lhs, const TextLayoutCacheKey& rhs) {
257    int deltaInt = lhs.start - rhs.start;
258    if (deltaInt != 0) return (deltaInt);
259
260    deltaInt = lhs.count - rhs.count;
261    if (deltaInt != 0) return (deltaInt);
262
263    deltaInt = lhs.contextCount - rhs.contextCount;
264    if (deltaInt != 0) return (deltaInt);
265
266    if (lhs.typeface < rhs.typeface) return -1;
267    if (lhs.typeface > rhs.typeface) return +1;
268
269    if (lhs.textSize < rhs.textSize) return -1;
270    if (lhs.textSize > rhs.textSize) return +1;
271
272    if (lhs.textSkewX < rhs.textSkewX) return -1;
273    if (lhs.textSkewX > rhs.textSkewX) return +1;
274
275    if (lhs.textScaleX < rhs.textScaleX) return -1;
276    if (lhs.textScaleX > rhs.textScaleX) return +1;
277
278    deltaInt = lhs.flags - rhs.flags;
279    if (deltaInt != 0) return (deltaInt);
280
281    deltaInt = lhs.hinting - rhs.hinting;
282    if (deltaInt != 0) return (deltaInt);
283
284    deltaInt = lhs.dirFlags - rhs.dirFlags;
285    if (deltaInt) return (deltaInt);
286
287    return memcmp(lhs.getText(), rhs.getText(), lhs.contextCount * sizeof(UChar));
288}
289
290void TextLayoutCacheKey::internalTextCopy() {
291    textCopy.setTo(text, contextCount);
292    text = NULL;
293}
294
295size_t TextLayoutCacheKey::getSize() {
296    return sizeof(TextLayoutCacheKey) + sizeof(UChar) * contextCount;
297}
298
299/**
300 * TextLayoutCacheValue
301 */
302TextLayoutCacheValue::TextLayoutCacheValue() :
303        mTotalAdvance(0), mElapsedTime(0) {
304}
305
306void TextLayoutCacheValue::setElapsedTime(uint32_t time) {
307    mElapsedTime = time;
308}
309
310uint32_t TextLayoutCacheValue::getElapsedTime() {
311    return mElapsedTime;
312}
313
314void TextLayoutCacheValue::computeValues(SkPaint* paint, const UChar* chars,
315        size_t start, size_t count, size_t contextCount, int dirFlags) {
316    // Give a hint for advances, glyphs and log clusters vectors size
317    mAdvances.setCapacity(contextCount);
318    mGlyphs.setCapacity(contextCount);
319
320    computeValuesWithHarfbuzz(paint, chars, start, count, contextCount, dirFlags,
321            &mAdvances, &mTotalAdvance, &mGlyphs);
322#if DEBUG_ADVANCES
323    LOGD("Advances - start=%d, count=%d, countextCount=%d, totalAdvance=%f", start, count,
324            contextCount, mTotalAdvance);
325#endif
326}
327
328size_t TextLayoutCacheValue::getSize() {
329    return sizeof(TextLayoutCacheValue) + sizeof(jfloat) * mAdvances.capacity() +
330            sizeof(jchar) * mGlyphs.capacity();
331}
332
333void TextLayoutCacheValue::initShaperItem(HB_ShaperItem& shaperItem, HB_FontRec* font,
334        FontData* fontData, SkPaint* paint, const UChar* chars, size_t contextCount) {
335    // Zero the Shaper struct
336    memset(&shaperItem, 0, sizeof(shaperItem));
337
338    font->klass = &harfbuzzSkiaClass;
339    font->userData = 0;
340
341    // The values which harfbuzzSkiaClass returns are already scaled to
342    // pixel units, so we just set all these to one to disable further
343    // scaling.
344    font->x_ppem = 1;
345    font->y_ppem = 1;
346    font->x_scale = 1;
347    font->y_scale = 1;
348
349    shaperItem.font = font;
350    shaperItem.face = HB_NewFace(shaperItem.font, harfbuzzSkiaGetTable);
351
352    // Reset kerning
353    shaperItem.kerning_applied = false;
354
355    // Define font data
356    fontData->typeFace = paint->getTypeface();
357    fontData->textSize = paint->getTextSize();
358    fontData->textSkewX = paint->getTextSkewX();
359    fontData->textScaleX = paint->getTextScaleX();
360    fontData->flags = paint->getFlags();
361    fontData->hinting = paint->getHinting();
362
363    shaperItem.font->userData = fontData;
364
365    // We cannot know, ahead of time, how many glyphs a given script run
366    // will produce. We take a guess that script runs will not produce more
367    // than twice as many glyphs as there are code points plus a bit of
368    // padding and fallback if we find that we are wrong.
369    createGlyphArrays(shaperItem, (contextCount + 2) * 2);
370
371    // Create log clusters array
372    shaperItem.log_clusters = new unsigned short[contextCount];
373
374    // Set the string properties
375    shaperItem.string = chars;
376    shaperItem.stringLength = contextCount;
377}
378
379void TextLayoutCacheValue::freeShaperItem(HB_ShaperItem& shaperItem) {
380    deleteGlyphArrays(shaperItem);
381    delete[] shaperItem.log_clusters;
382    HB_FreeFace(shaperItem.face);
383}
384
385void TextLayoutCacheValue::shapeRun(HB_ShaperItem& shaperItem, size_t start, size_t count,
386        bool isRTL) {
387    // Update Harfbuzz Shaper
388    shaperItem.item.pos = start;
389    shaperItem.item.length = count;
390    shaperItem.item.bidiLevel = isRTL;
391
392    shaperItem.item.script = isRTL ? HB_Script_Arabic : HB_Script_Common;
393
394    // Shape
395    while (!HB_ShapeItem(&shaperItem)) {
396        // We overflowed our arrays. Resize and retry.
397        // HB_ShapeItem fills in shaperItem.num_glyphs with the needed size.
398        deleteGlyphArrays(shaperItem);
399        createGlyphArrays(shaperItem, shaperItem.num_glyphs << 1);
400    }
401}
402
403void TextLayoutCacheValue::computeValuesWithHarfbuzz(SkPaint* paint, const UChar* chars,
404        size_t start, size_t count, size_t contextCount, int dirFlags,
405        Vector<jfloat>* const outAdvances, jfloat* outTotalAdvance,
406        Vector<jchar>* const outGlyphs) {
407
408        UBiDiLevel bidiReq = 0;
409        bool forceLTR = false;
410        bool forceRTL = false;
411
412        switch (dirFlags) {
413            case kBidi_LTR: bidiReq = 0; break; // no ICU constant, canonical LTR level
414            case kBidi_RTL: bidiReq = 1; break; // no ICU constant, canonical RTL level
415            case kBidi_Default_LTR: bidiReq = UBIDI_DEFAULT_LTR; break;
416            case kBidi_Default_RTL: bidiReq = UBIDI_DEFAULT_RTL; break;
417            case kBidi_Force_LTR: forceLTR = true; break; // every char is LTR
418            case kBidi_Force_RTL: forceRTL = true; break; // every char is RTL
419        }
420
421        HB_ShaperItem shaperItem;
422        HB_FontRec font;
423        FontData fontData;
424
425        // Initialize Harfbuzz Shaper
426        initShaperItem(shaperItem, &font, &fontData, paint, chars, contextCount);
427
428        bool useSingleRun = false;
429        bool isRTL = forceRTL;
430        if (forceLTR || forceRTL) {
431            useSingleRun = true;
432        } else {
433            UBiDi* bidi = ubidi_open();
434            if (bidi) {
435                UErrorCode status = U_ZERO_ERROR;
436#if DEBUG_GLYPHS
437                LOGD("computeValuesWithHarfbuzz -- bidiReq=%d", bidiReq);
438#endif
439                ubidi_setPara(bidi, chars, contextCount, bidiReq, NULL, &status);
440                if (U_SUCCESS(status)) {
441                    int paraDir = ubidi_getParaLevel(bidi) & kDirection_Mask; // 0 if ltr, 1 if rtl
442                    ssize_t rc = ubidi_countRuns(bidi, &status);
443#if DEBUG_GLYPHS
444                    LOGD("computeValuesWithHarfbuzz -- dirFlags=%d run-count=%d paraDir=%d",
445                            dirFlags, rc, paraDir);
446#endif
447                    if (!U_SUCCESS(status) || rc <= 1) {
448                        LOGW("computeValuesWithHarfbuzz -- need to force to single run");
449                        isRTL = (paraDir == 1);
450                        useSingleRun = true;
451                    } else {
452                        int32_t end = start + count;
453                        for (size_t i = 0; i < size_t(rc); ++i) {
454                            int32_t startRun = -1;
455                            int32_t lengthRun = -1;
456                            UBiDiDirection runDir = ubidi_getVisualRun(bidi, i, &startRun, &lengthRun);
457
458                            if (startRun == -1 || lengthRun == -1) {
459                                // Something went wrong when getting the visual run, need to clear
460                                // already computed data before doing a single run pass
461                                LOGW("computeValuesWithHarfbuzz -- visual run is not valid");
462                                outGlyphs->clear();
463                                outAdvances->clear();
464                                *outTotalAdvance = 0;
465                                isRTL = (paraDir == 1);
466                                useSingleRun = true;
467                                break;
468                            }
469
470                            if (startRun >= end) {
471                                continue;
472                            }
473                            int32_t endRun = startRun + lengthRun;
474                            if (endRun <= int32_t(start)) {
475                                continue;
476                            }
477                            if (startRun < int32_t(start)) {
478                                startRun = int32_t(start);
479                            }
480                            if (endRun > end) {
481                                endRun = end;
482                            }
483
484                            lengthRun = endRun - startRun;
485                            isRTL = (runDir == UBIDI_RTL);
486                            jfloat runTotalAdvance = 0;
487#if DEBUG_GLYPHS
488                            LOGD("computeValuesWithHarfbuzz -- run-start=%d run-len=%d isRTL=%d",
489                                    startRun, lengthRun, isRTL);
490#endif
491                            computeRunValuesWithHarfbuzz(shaperItem, paint,
492                                    startRun, lengthRun, isRTL,
493                                    outAdvances, &runTotalAdvance, outGlyphs);
494
495                            *outTotalAdvance += runTotalAdvance;
496                        }
497                    }
498                } else {
499                    LOGW("computeValuesWithHarfbuzz -- cannot set Para");
500                    useSingleRun = true;
501                    isRTL = (bidiReq = 1) || (bidiReq = UBIDI_DEFAULT_RTL);
502                }
503                ubidi_close(bidi);
504            } else {
505                LOGW("computeValuesWithHarfbuzz -- cannot ubidi_open()");
506                useSingleRun = true;
507                isRTL = (bidiReq = 1) || (bidiReq = UBIDI_DEFAULT_RTL);
508            }
509        }
510
511        // Default single run case
512        if (useSingleRun){
513#if DEBUG_GLYPHS
514            LOGD("computeValuesWithHarfbuzz -- Using a SINGLE Run "
515                    "-- run-start=%d run-len=%d isRTL=%d", start, count, isRTL);
516#endif
517            computeRunValuesWithHarfbuzz(shaperItem, paint,
518                    start, count, isRTL,
519                    outAdvances, outTotalAdvance, outGlyphs);
520        }
521
522        // Cleaning
523        freeShaperItem(shaperItem);
524
525#if DEBUG_GLYPHS
526        LOGD("computeValuesWithHarfbuzz -- total-glyphs-count=%d", outGlyphs->size());
527#endif
528}
529
530static void logGlyphs(HB_ShaperItem shaperItem) {
531    LOGD("Got glyphs - count=%d", shaperItem.num_glyphs);
532    for (size_t i = 0; i < shaperItem.num_glyphs; i++) {
533        LOGD("      glyph[%d]=%d - offset.x=%f offset.y=%f", i, shaperItem.glyphs[i],
534                HBFixedToFloat(shaperItem.offsets[i].x),
535                HBFixedToFloat(shaperItem.offsets[i].y));
536    }
537}
538
539void TextLayoutCacheValue::computeRunValuesWithHarfbuzz(HB_ShaperItem& shaperItem, SkPaint* paint,
540        size_t start, size_t count, bool isRTL,
541        Vector<jfloat>* const outAdvances, jfloat* outTotalAdvance,
542        Vector<jchar>* const outGlyphs) {
543
544    shapeRun(shaperItem, start, count, isRTL);
545
546#if DEBUG_GLYPHS
547    LOGD("HARFBUZZ -- num_glypth=%d - kerning_applied=%d", shaperItem.num_glyphs,
548            shaperItem.kerning_applied);
549    LOGD("         -- string= '%s'", String8(chars + start, count).string());
550    LOGD("         -- isDevKernText=%d", paint->isDevKernText());
551
552    logGlyphs(shaperItem);
553#endif
554
555    if (shaperItem.advances == NULL || shaperItem.num_glyphs == 0) {
556#if DEBUG_GLYPHS
557    LOGD("HARFBUZZ -- advances array is empty or num_glypth = 0");
558#endif
559        outAdvances->insertAt(0, outAdvances->size(), count);
560        *outTotalAdvance = 0;
561        return;
562    }
563
564    // Get Advances and their total
565    jfloat currentAdvance = HBFixedToFloat(shaperItem.advances[shaperItem.log_clusters[0]]);
566    jfloat totalAdvance = currentAdvance;
567    outAdvances->add(currentAdvance);
568    for (size_t i = 1; i < count; i++) {
569        size_t clusterPrevious = shaperItem.log_clusters[i - 1];
570        size_t cluster = shaperItem.log_clusters[i];
571        if (cluster == clusterPrevious) {
572            outAdvances->add(0);
573        } else {
574            currentAdvance = HBFixedToFloat(shaperItem.advances[shaperItem.log_clusters[i]]);
575            totalAdvance += currentAdvance;
576            outAdvances->add(currentAdvance);
577        }
578    }
579    *outTotalAdvance = totalAdvance;
580
581#if DEBUG_ADVANCES
582    for (size_t i = 0; i < count; i++) {
583        LOGD("hb-adv[%d] = %f - log_clusters = %d - total = %f", i,
584                (*outAdvances)[i], shaperItem.log_clusters[i], totalAdvance);
585    }
586#endif
587
588    // Get Glyphs and reverse them in place if RTL
589    if (outGlyphs) {
590        size_t countGlyphs = shaperItem.num_glyphs;
591        for (size_t i = 0; i < countGlyphs; i++) {
592            jchar glyph = (jchar) shaperItem.glyphs[(!isRTL) ? i : countGlyphs - 1 - i];
593#if DEBUG_GLYPHS
594            LOGD("HARFBUZZ  -- glyph[%d]=%d", i, glyph);
595#endif
596            outGlyphs->add(glyph);
597        }
598    }
599}
600
601void TextLayoutCacheValue::deleteGlyphArrays(HB_ShaperItem& shaperItem) {
602    delete[] shaperItem.glyphs;
603    delete[] shaperItem.attributes;
604    delete[] shaperItem.advances;
605    delete[] shaperItem.offsets;
606}
607
608void TextLayoutCacheValue::createGlyphArrays(HB_ShaperItem& shaperItem, int size) {
609    shaperItem.glyphs = new HB_Glyph[size];
610    shaperItem.attributes = new HB_GlyphAttributes[size];
611    shaperItem.advances = new HB_Fixed[size];
612    shaperItem.offsets = new HB_FixedPoint[size];
613    shaperItem.num_glyphs = size;
614}
615
616} // namespace android
617