| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "TextLayoutCache" |
| |
| #include <utils/JenkinsHash.h> |
| |
| #include "TextLayoutCache.h" |
| #include "TextLayout.h" |
| #include "SkFontHost.h" |
| #include "SkTypeface_android.h" |
| #include "HarfBuzzNGFaceSkia.h" |
| #include <unicode/unistr.h> |
| #include <unicode/uchar.h> |
| #include <hb-icu.h> |
| |
| namespace android { |
| |
| //-------------------------------------------------------------------------------------------------- |
| |
| ANDROID_SINGLETON_STATIC_INSTANCE(TextLayoutEngine); |
| |
| //-------------------------------------------------------------------------------------------------- |
| |
| TextLayoutCache::TextLayoutCache(TextLayoutShaper* shaper) : |
| mShaper(shaper), |
| mCache(LruCache<TextLayoutCacheKey, sp<TextLayoutValue> >::kUnlimitedCapacity), |
| mSize(0), mMaxSize(MB(DEFAULT_TEXT_LAYOUT_CACHE_SIZE_IN_MB)), |
| mCacheHitCount(0), mNanosecondsSaved(0) { |
| init(); |
| } |
| |
| TextLayoutCache::~TextLayoutCache() { |
| mCache.clear(); |
| } |
| |
| void TextLayoutCache::init() { |
| mCache.setOnEntryRemovedListener(this); |
| |
| mDebugLevel = readRtlDebugLevel(); |
| mDebugEnabled = mDebugLevel & kRtlDebugCaches; |
| ALOGD("Using debug level = %d - Debug Enabled = %d", mDebugLevel, mDebugEnabled); |
| |
| mCacheStartTime = systemTime(SYSTEM_TIME_MONOTONIC); |
| |
| if (mDebugEnabled) { |
| ALOGD("Initialization is done - Start time = %lld", mCacheStartTime); |
| } |
| |
| mInitialized = true; |
| } |
| |
| /** |
| * Callbacks |
| */ |
| void TextLayoutCache::operator()(TextLayoutCacheKey& text, sp<TextLayoutValue>& desc) { |
| size_t totalSizeToDelete = text.getSize() + desc->getSize(); |
| mSize -= totalSizeToDelete; |
| if (mDebugEnabled) { |
| ALOGD("Cache value %p deleted, size = %d", desc.get(), totalSizeToDelete); |
| } |
| } |
| |
| /* |
| * Cache clearing |
| */ |
| void TextLayoutCache::purgeCaches() { |
| AutoMutex _l(mLock); |
| mCache.clear(); |
| mShaper->purgeCaches(); |
| } |
| |
| /* |
| * Caching |
| */ |
| sp<TextLayoutValue> TextLayoutCache::getValue(const SkPaint* paint, |
| const jchar* text, jint start, jint count, jint contextCount) { |
| AutoMutex _l(mLock); |
| nsecs_t startTime = 0; |
| if (mDebugEnabled) { |
| startTime = systemTime(SYSTEM_TIME_MONOTONIC); |
| } |
| |
| // Create the key |
| TextLayoutCacheKey key(paint, text, start, count, contextCount); |
| |
| // Get value from cache if possible |
| sp<TextLayoutValue> value = mCache.get(key); |
| |
| // Value not found for the key, we need to add a new value in the cache |
| if (value == NULL) { |
| if (mDebugEnabled) { |
| startTime = systemTime(SYSTEM_TIME_MONOTONIC); |
| } |
| |
| value = new TextLayoutValue(contextCount); |
| |
| // Compute advances and store them |
| mShaper->computeValues(value.get(), paint, |
| reinterpret_cast<const UChar*>(key.getText()), start, count, |
| size_t(contextCount)); |
| |
| if (mDebugEnabled) { |
| value->setElapsedTime(systemTime(SYSTEM_TIME_MONOTONIC) - startTime); |
| } |
| |
| // Don't bother to add in the cache if the entry is too big |
| size_t size = key.getSize() + value->getSize(); |
| if (size <= mMaxSize) { |
| // Cleanup to make some room if needed |
| if (mSize + size > mMaxSize) { |
| if (mDebugEnabled) { |
| ALOGD("Need to clean some entries for making some room for a new entry"); |
| } |
| while (mSize + size > mMaxSize) { |
| // This will call the callback |
| bool removedOne = mCache.removeOldest(); |
| LOG_ALWAYS_FATAL_IF(!removedOne, "The cache is non-empty but we " |
| "failed to remove the oldest entry. " |
| "mSize = %u, size = %u, mMaxSize = %u, mCache.size() = %u", |
| mSize, size, mMaxSize, mCache.size()); |
| } |
| } |
| |
| // Update current cache size |
| mSize += size; |
| |
| bool putOne = mCache.put(key, value); |
| LOG_ALWAYS_FATAL_IF(!putOne, "Failed to put an entry into the cache. " |
| "This indicates that the cache already has an entry with the " |
| "same key but it should not since we checked earlier!" |
| " - start = %d, count = %d, contextCount = %d - Text = '%s'", |
| start, count, contextCount, String8(key.getText() + start, count).string()); |
| |
| if (mDebugEnabled) { |
| nsecs_t totalTime = systemTime(SYSTEM_TIME_MONOTONIC) - startTime; |
| ALOGD("CACHE MISS: Added entry %p " |
| "with start = %d, count = %d, contextCount = %d, " |
| "entry size %d bytes, remaining space %d bytes" |
| " - Compute time %0.6f ms - Put time %0.6f ms - Text = '%s'", |
| value.get(), start, count, contextCount, size, mMaxSize - mSize, |
| value->getElapsedTime() * 0.000001f, |
| (totalTime - value->getElapsedTime()) * 0.000001f, |
| String8(key.getText() + start, count).string()); |
| } |
| } else { |
| if (mDebugEnabled) { |
| ALOGD("CACHE MISS: Calculated but not storing entry because it is too big " |
| "with start = %d, count = %d, contextCount = %d, " |
| "entry size %d bytes, remaining space %d bytes" |
| " - Compute time %0.6f ms - Text = '%s'", |
| start, count, contextCount, size, mMaxSize - mSize, |
| value->getElapsedTime() * 0.000001f, |
| String8(key.getText() + start, count).string()); |
| } |
| } |
| } else { |
| // This is a cache hit, just log timestamp and user infos |
| if (mDebugEnabled) { |
| nsecs_t elapsedTimeThruCacheGet = systemTime(SYSTEM_TIME_MONOTONIC) - startTime; |
| mNanosecondsSaved += (value->getElapsedTime() - elapsedTimeThruCacheGet); |
| ++mCacheHitCount; |
| |
| if (value->getElapsedTime() > 0) { |
| float deltaPercent = 100 * ((value->getElapsedTime() - elapsedTimeThruCacheGet) |
| / ((float)value->getElapsedTime())); |
| ALOGD("CACHE HIT #%d with start = %d, count = %d, contextCount = %d" |
| "- Compute time %0.6f ms - " |
| "Cache get time %0.6f ms - Gain in percent: %2.2f - Text = '%s'", |
| mCacheHitCount, start, count, contextCount, |
| value->getElapsedTime() * 0.000001f, |
| elapsedTimeThruCacheGet * 0.000001f, |
| deltaPercent, |
| String8(key.getText() + start, count).string()); |
| } |
| if (mCacheHitCount % DEFAULT_DUMP_STATS_CACHE_HIT_INTERVAL == 0) { |
| dumpCacheStats(); |
| } |
| } |
| } |
| return value; |
| } |
| |
| void TextLayoutCache::dumpCacheStats() { |
| float remainingPercent = 100 * ((mMaxSize - mSize) / ((float)mMaxSize)); |
| float timeRunningInSec = (systemTime(SYSTEM_TIME_MONOTONIC) - mCacheStartTime) / 1000000000; |
| |
| size_t cacheSize = mCache.size(); |
| |
| ALOGD("------------------------------------------------"); |
| ALOGD("Cache stats"); |
| ALOGD("------------------------------------------------"); |
| ALOGD("pid : %d", getpid()); |
| ALOGD("running : %.0f seconds", timeRunningInSec); |
| ALOGD("entries : %d", cacheSize); |
| ALOGD("max size : %d bytes", mMaxSize); |
| ALOGD("used : %d bytes according to mSize", mSize); |
| ALOGD("remaining : %d bytes or %2.2f percent", mMaxSize - mSize, remainingPercent); |
| ALOGD("hits : %d", mCacheHitCount); |
| ALOGD("saved : %0.6f ms", mNanosecondsSaved * 0.000001f); |
| ALOGD("------------------------------------------------"); |
| } |
| |
| /** |
| * TextLayoutCacheKey |
| */ |
| TextLayoutCacheKey::TextLayoutCacheKey(): start(0), count(0), contextCount(0), |
| typeface(NULL), textSize(0), textSkewX(0), textScaleX(0), flags(0), |
| hinting(SkPaint::kNo_Hinting), variant(SkPaint::kDefault_Variant), language() { |
| } |
| |
| TextLayoutCacheKey::TextLayoutCacheKey(const SkPaint* paint, const UChar* text, |
| size_t start, size_t count, size_t contextCount) : |
| start(start), count(count), contextCount(contextCount) { |
| textCopy.setTo(text, contextCount); |
| typeface = paint->getTypeface(); |
| textSize = paint->getTextSize(); |
| textSkewX = paint->getTextSkewX(); |
| textScaleX = paint->getTextScaleX(); |
| flags = paint->getFlags(); |
| hinting = paint->getHinting(); |
| variant = paint->getFontVariant(); |
| language = paint->getLanguage(); |
| } |
| |
| TextLayoutCacheKey::TextLayoutCacheKey(const TextLayoutCacheKey& other) : |
| textCopy(other.textCopy), |
| start(other.start), |
| count(other.count), |
| contextCount(other.contextCount), |
| typeface(other.typeface), |
| textSize(other.textSize), |
| textSkewX(other.textSkewX), |
| textScaleX(other.textScaleX), |
| flags(other.flags), |
| hinting(other.hinting), |
| variant(other.variant), |
| language(other.language) { |
| } |
| |
| int TextLayoutCacheKey::compare(const TextLayoutCacheKey& lhs, const TextLayoutCacheKey& rhs) { |
| int deltaInt = lhs.start - rhs.start; |
| if (deltaInt != 0) return (deltaInt); |
| |
| deltaInt = lhs.count - rhs.count; |
| if (deltaInt != 0) return (deltaInt); |
| |
| deltaInt = lhs.contextCount - rhs.contextCount; |
| if (deltaInt != 0) return (deltaInt); |
| |
| if (lhs.typeface < rhs.typeface) return -1; |
| if (lhs.typeface > rhs.typeface) return +1; |
| |
| if (lhs.textSize < rhs.textSize) return -1; |
| if (lhs.textSize > rhs.textSize) return +1; |
| |
| if (lhs.textSkewX < rhs.textSkewX) return -1; |
| if (lhs.textSkewX > rhs.textSkewX) return +1; |
| |
| if (lhs.textScaleX < rhs.textScaleX) return -1; |
| if (lhs.textScaleX > rhs.textScaleX) return +1; |
| |
| deltaInt = lhs.flags - rhs.flags; |
| if (deltaInt != 0) return (deltaInt); |
| |
| deltaInt = lhs.hinting - rhs.hinting; |
| if (deltaInt != 0) return (deltaInt); |
| |
| deltaInt = lhs.variant - rhs.variant; |
| if (deltaInt) return (deltaInt); |
| |
| if (lhs.language < rhs.language) return -1; |
| if (lhs.language > rhs.language) return +1; |
| |
| return memcmp(lhs.getText(), rhs.getText(), lhs.contextCount * sizeof(UChar)); |
| } |
| |
| size_t TextLayoutCacheKey::getSize() const { |
| return sizeof(TextLayoutCacheKey) + sizeof(UChar) * contextCount; |
| } |
| |
| hash_t TextLayoutCacheKey::hash() const { |
| uint32_t hash = JenkinsHashMix(0, start); |
| hash = JenkinsHashMix(hash, count); |
| /* contextCount not needed because it's included in text, below */ |
| hash = JenkinsHashMix(hash, hash_type(typeface)); |
| hash = JenkinsHashMix(hash, hash_type(textSize)); |
| hash = JenkinsHashMix(hash, hash_type(textSkewX)); |
| hash = JenkinsHashMix(hash, hash_type(textScaleX)); |
| hash = JenkinsHashMix(hash, flags); |
| hash = JenkinsHashMix(hash, hinting); |
| hash = JenkinsHashMix(hash, variant); |
| // Note: leaving out language is not problematic, as equality comparisons |
| // are still valid - the only bad thing that could happen is collisions. |
| hash = JenkinsHashMixShorts(hash, getText(), contextCount); |
| return JenkinsHashWhiten(hash); |
| } |
| |
| /** |
| * TextLayoutCacheValue |
| */ |
| TextLayoutValue::TextLayoutValue(size_t contextCount) : |
| mTotalAdvance(0), mElapsedTime(0) { |
| // Give a hint for advances and glyphs vectors size |
| mAdvances.setCapacity(contextCount); |
| mGlyphs.setCapacity(contextCount); |
| mPos.setCapacity(contextCount * 2); |
| } |
| |
| size_t TextLayoutValue::getSize() const { |
| return sizeof(TextLayoutValue) + sizeof(jfloat) * mAdvances.capacity() + |
| sizeof(jchar) * mGlyphs.capacity() + sizeof(jfloat) * mPos.capacity(); |
| } |
| |
| void TextLayoutValue::setElapsedTime(uint32_t time) { |
| mElapsedTime = time; |
| } |
| |
| uint32_t TextLayoutValue::getElapsedTime() { |
| return mElapsedTime; |
| } |
| |
| TextLayoutShaper::TextLayoutShaper() { |
| init(); |
| |
| mBuffer = hb_buffer_create(); |
| } |
| |
| void TextLayoutShaper::init() { |
| mDefaultTypeface = SkFontHost::CreateTypeface(NULL, NULL, SkTypeface::kNormal); |
| } |
| |
| void TextLayoutShaper::unrefTypefaces() { |
| SkSafeUnref(mDefaultTypeface); |
| } |
| |
| TextLayoutShaper::~TextLayoutShaper() { |
| hb_buffer_destroy(mBuffer); |
| |
| unrefTypefaces(); |
| } |
| |
| void TextLayoutShaper::computeValues(TextLayoutValue* value, const SkPaint* paint, const UChar* chars, |
| size_t start, size_t count, size_t contextCount) { |
| |
| computeValues(paint, chars, start, count, contextCount, |
| &value->mAdvances, &value->mTotalAdvance, &value->mGlyphs, &value->mPos); |
| #if DEBUG_ADVANCES |
| ALOGD("Advances - start = %d, count = %d, contextCount = %d, totalAdvance = %f", start, count, |
| contextCount, value->mTotalAdvance); |
| #endif |
| } |
| |
| void TextLayoutShaper::computeValues(const SkPaint* paint, const UChar* chars, |
| size_t start, size_t count, size_t contextCount, |
| Vector<jfloat>* const outAdvances, jfloat* outTotalAdvance, |
| Vector<jchar>* const outGlyphs, Vector<jfloat>* const outPos) { |
| *outTotalAdvance = 0; |
| if (!count) { |
| return; |
| } |
| |
| UBiDiLevel bidiReq = UBIDI_DEFAULT_LTR; |
| bool useSingleRun = false; |
| bool isRTL = false; |
| |
| UBiDi* bidi = ubidi_open(); |
| if (bidi) { |
| UErrorCode status = U_ZERO_ERROR; |
| #if DEBUG_GLYPHS |
| ALOGD("******** ComputeValues -- start"); |
| ALOGD(" -- string = '%s'", String8(chars + start, count).string()); |
| ALOGD(" -- start = %d", start); |
| ALOGD(" -- count = %d", count); |
| ALOGD(" -- contextCount = %d", contextCount); |
| ALOGD(" -- bidiReq = %d", bidiReq); |
| #endif |
| ubidi_setPara(bidi, chars, contextCount, bidiReq, NULL, &status); |
| if (U_SUCCESS(status)) { |
| int paraDir = ubidi_getParaLevel(bidi) & kDirection_Mask; // 0 if ltr, 1 if rtl |
| ssize_t rc = ubidi_countRuns(bidi, &status); |
| #if DEBUG_GLYPHS |
| ALOGD(" -- paraDir = %d", paraDir); |
| ALOGD(" -- run-count = %d", int(rc)); |
| #endif |
| if (U_SUCCESS(status) && rc == 1) { |
| // Normal case: one run, status is ok |
| isRTL = (paraDir == 1); |
| useSingleRun = true; |
| } else if (!U_SUCCESS(status) || rc < 1) { |
| ALOGW("Need to force to single run -- string = '%s'," |
| " status = %d, rc = %d", |
| String8(chars + start, count).string(), status, int(rc)); |
| isRTL = (paraDir == 1); |
| useSingleRun = true; |
| } else { |
| int32_t end = start + count; |
| for (size_t i = 0; i < size_t(rc); ++i) { |
| int32_t startRun = -1; |
| int32_t lengthRun = -1; |
| UBiDiDirection runDir = ubidi_getVisualRun(bidi, i, &startRun, &lengthRun); |
| |
| if (startRun == -1 || lengthRun == -1) { |
| // Something went wrong when getting the visual run, need to clear |
| // already computed data before doing a single run pass |
| ALOGW("Visual run is not valid"); |
| outGlyphs->clear(); |
| outAdvances->clear(); |
| outPos->clear(); |
| *outTotalAdvance = 0; |
| isRTL = (paraDir == 1); |
| useSingleRun = true; |
| break; |
| } |
| |
| if (startRun >= end) { |
| continue; |
| } |
| int32_t endRun = startRun + lengthRun; |
| if (endRun <= int32_t(start)) { |
| continue; |
| } |
| if (startRun < int32_t(start)) { |
| startRun = int32_t(start); |
| } |
| if (endRun > end) { |
| endRun = end; |
| } |
| |
| lengthRun = endRun - startRun; |
| isRTL = (runDir == UBIDI_RTL); |
| #if DEBUG_GLYPHS |
| ALOGD("Processing Bidi Run = %d -- run-start = %d, run-len = %d, isRTL = %d", |
| i, startRun, lengthRun, isRTL); |
| #endif |
| computeRunValues(paint, chars, startRun, lengthRun, contextCount, isRTL, |
| outAdvances, outTotalAdvance, outGlyphs, outPos); |
| |
| } |
| } |
| } else { |
| ALOGW("Cannot set Para"); |
| useSingleRun = true; |
| isRTL = (bidiReq = 1) || (bidiReq = UBIDI_DEFAULT_RTL); |
| } |
| ubidi_close(bidi); |
| } else { |
| ALOGW("Cannot ubidi_open()"); |
| useSingleRun = true; |
| isRTL = (bidiReq = 1) || (bidiReq = UBIDI_DEFAULT_RTL); |
| } |
| |
| // Default single run case |
| if (useSingleRun){ |
| #if DEBUG_GLYPHS |
| ALOGD("Using a SINGLE BiDi Run " |
| "-- run-start = %d, run-len = %d, isRTL = %d", start, count, isRTL); |
| #endif |
| computeRunValues(paint, chars, start, count, contextCount, isRTL, |
| outAdvances, outTotalAdvance, outGlyphs, outPos); |
| } |
| |
| #if DEBUG_GLYPHS |
| ALOGD(" -- Total returned glyphs-count = %d", outGlyphs->size()); |
| ALOGD("******** ComputeValues -- end"); |
| #endif |
| } |
| |
| #define HB_IsHighSurrogate(ucs) \ |
| (((ucs) & 0xfc00) == 0xd800) |
| |
| #define HB_IsLowSurrogate(ucs) \ |
| (((ucs) & 0xfc00) == 0xdc00) |
| |
| #ifndef HB_SurrogateToUcs4 |
| #define HB_SurrogateToUcs4_(high, low) \ |
| (((hb_codepoint_t)(high))<<10) + (low) - 0x35fdc00; |
| #endif |
| |
| #define HB_InvalidCodePoint ~0u |
| |
| hb_codepoint_t |
| utf16_to_code_point(const uint16_t *chars, size_t len, ssize_t *iter) { |
| const uint16_t v = chars[(*iter)++]; |
| if (HB_IsHighSurrogate(v)) { |
| // surrogate pair |
| if (size_t(*iter) >= len) { |
| // the surrogate is incomplete. |
| return HB_InvalidCodePoint; |
| } |
| const uint16_t v2 = chars[(*iter)++]; |
| if (!HB_IsLowSurrogate(v2)) { |
| // invalidate surrogate pair. |
| (*iter)--; |
| return HB_InvalidCodePoint; |
| } |
| |
| return HB_SurrogateToUcs4(v, v2); |
| } |
| |
| if (HB_IsLowSurrogate(v)) { |
| // this isn't a valid code point |
| return HB_InvalidCodePoint; |
| } |
| |
| return v; |
| } |
| |
| hb_codepoint_t |
| utf16_to_code_point_prev(const uint16_t *chars, size_t len, ssize_t *iter) { |
| const uint16_t v = chars[(*iter)--]; |
| if (HB_IsLowSurrogate(v)) { |
| // surrogate pair |
| if (*iter < 0) { |
| // the surrogate is incomplete. |
| return HB_InvalidCodePoint; |
| } |
| const uint16_t v2 = chars[(*iter)--]; |
| if (!HB_IsHighSurrogate(v2)) { |
| // invalidate surrogate pair. |
| (*iter)++; |
| return HB_InvalidCodePoint; |
| } |
| |
| return HB_SurrogateToUcs4(v2, v); |
| } |
| |
| if (HB_IsHighSurrogate(v)) { |
| // this isn't a valid code point |
| return HB_InvalidCodePoint; |
| } |
| |
| return v; |
| } |
| |
| struct ScriptRun { |
| hb_script_t script; |
| size_t pos; |
| size_t length; |
| }; |
| |
| hb_script_t code_point_to_script(hb_codepoint_t codepoint) { |
| static hb_unicode_funcs_t* u; |
| if (!u) { |
| u = hb_icu_get_unicode_funcs(); |
| } |
| return hb_unicode_script(u, codepoint); |
| } |
| |
| bool |
| hb_utf16_script_run_next(ScriptRun* run, const uint16_t *chars, size_t len, ssize_t *iter) { |
| if (size_t(*iter) == len) |
| return false; |
| |
| run->pos = *iter; |
| const uint32_t init_cp = utf16_to_code_point(chars, len, iter); |
| const hb_script_t init_script = code_point_to_script(init_cp); |
| hb_script_t current_script = init_script; |
| run->script = init_script; |
| |
| for (;;) { |
| if (size_t(*iter) == len) |
| break; |
| const ssize_t prev_iter = *iter; |
| const uint32_t cp = utf16_to_code_point(chars, len, iter); |
| const hb_script_t script = code_point_to_script(cp); |
| |
| if (script != current_script) { |
| /* BEGIN android-changed |
| The condition was not correct by doing "a == b == constant" |
| END android-changed */ |
| if (current_script == HB_SCRIPT_INHERITED && init_script == HB_SCRIPT_INHERITED) { |
| // If we started off as inherited, we take whatever we can find. |
| run->script = script; |
| current_script = script; |
| continue; |
| } else if (script == HB_SCRIPT_INHERITED) { |
| continue; |
| } else { |
| *iter = prev_iter; |
| break; |
| } |
| } |
| } |
| |
| if (run->script == HB_SCRIPT_INHERITED) |
| run->script = HB_SCRIPT_COMMON; |
| |
| run->length = *iter - run->pos; |
| return true; |
| } |
| |
| bool |
| hb_utf16_script_run_prev(ScriptRun* run, const uint16_t *chars, size_t len, ssize_t *iter) { |
| if (*iter == -1) |
| return false; |
| |
| const size_t ending_index = *iter; |
| const uint32_t init_cp = utf16_to_code_point_prev(chars, len, iter); |
| const hb_script_t init_script = code_point_to_script(init_cp); |
| hb_script_t current_script = init_script; |
| run->script = init_script; |
| |
| for (;;) { |
| if (*iter < 0) |
| break; |
| const ssize_t prev_iter = *iter; |
| const uint32_t cp = utf16_to_code_point_prev(chars, len, iter); |
| const hb_script_t script = code_point_to_script(cp); |
| |
| if (script != current_script) { |
| if (current_script == HB_SCRIPT_INHERITED && init_script == HB_SCRIPT_INHERITED) { |
| // If we started off as inherited, we take whatever we can find. |
| run->script = script; |
| current_script = script; |
| continue; |
| } else if (script == HB_SCRIPT_INHERITED) { |
| /* BEGIN android-changed |
| We apply the same fix for Chrome to Android. |
| Chrome team will talk with upsteam about it. |
| Just assume that whatever follows this combining character is within |
| the same script. This is incorrect if you had language1 + combining |
| char + language 2, but that is rare and this code is suspicious |
| anyway. |
| END android-changed */ |
| continue; |
| } else { |
| *iter = prev_iter; |
| break; |
| } |
| } |
| } |
| |
| if (run->script == HB_SCRIPT_INHERITED) |
| run->script = HB_SCRIPT_COMMON; |
| |
| run->pos = *iter + 1; |
| run->length = ending_index - *iter; |
| return true; |
| } |
| |
| |
| static void logGlyphs(hb_buffer_t* buffer) { |
| unsigned int numGlyphs; |
| hb_glyph_info_t* info = hb_buffer_get_glyph_infos(buffer, &numGlyphs); |
| hb_glyph_position_t* positions = hb_buffer_get_glyph_positions(buffer, NULL); |
| ALOGD(" -- glyphs count=%d", numGlyphs); |
| for (size_t i = 0; i < numGlyphs; i++) { |
| ALOGD(" -- glyph[%d] = %d, cluster = %u, advance = %0.2f, offset.x = %0.2f, offset.y = %0.2f", i, |
| info[i].codepoint, |
| info[i].cluster, |
| HBFixedToFloat(positions[i].x_advance), |
| HBFixedToFloat(positions[i].x_offset), |
| HBFixedToFloat(positions[i].y_offset)); |
| } |
| } |
| |
| void TextLayoutShaper::computeRunValues(const SkPaint* paint, const UChar* contextChars, |
| size_t start, size_t count, size_t contextCount, bool isRTL, |
| Vector<jfloat>* const outAdvances, jfloat* outTotalAdvance, |
| Vector<jchar>* const outGlyphs, Vector<jfloat>* const outPos) { |
| if (!count) { |
| // We cannot shape an empty run. |
| return; |
| } |
| |
| // To be filled in later |
| for (size_t i = 0; i < count; i++) { |
| outAdvances->add(0); |
| } |
| |
| // Set the string properties |
| const UChar* chars = contextChars + start; |
| |
| // Define shaping paint properties |
| mShapingPaint.setTextSize(paint->getTextSize()); |
| float skewX = paint->getTextSkewX(); |
| mShapingPaint.setTextSkewX(skewX); |
| mShapingPaint.setTextScaleX(paint->getTextScaleX()); |
| mShapingPaint.setFlags(paint->getFlags()); |
| mShapingPaint.setHinting(paint->getHinting()); |
| mShapingPaint.setFontVariant(paint->getFontVariant()); |
| mShapingPaint.setLanguage(paint->getLanguage()); |
| |
| // Split the BiDi run into Script runs. Harfbuzz will populate the pos, length and script |
| // into the shaperItem |
| ssize_t indexFontRun = isRTL ? count - 1 : 0; |
| jfloat totalAdvance = *outTotalAdvance; |
| ScriptRun run; // relative to chars |
| while ((isRTL) ? |
| hb_utf16_script_run_prev(&run, chars, count, &indexFontRun): |
| hb_utf16_script_run_next(&run, chars, count, &indexFontRun)) { |
| |
| #if DEBUG_GLYPHS |
| ALOGD("-------- Start of Script Run --------"); |
| ALOGD("Shaping Script Run with"); |
| ALOGD(" -- isRTL = %d", isRTL); |
| ALOGD(" -- HB script = %c%c%c%c", HB_UNTAG(run.script)); |
| ALOGD(" -- run.pos = %d", int(run.pos)); |
| ALOGD(" -- run.length = %d", int(run.length)); |
| ALOGD(" -- run = '%s'", String8(chars + run.pos, run.length).string()); |
| ALOGD(" -- string = '%s'", String8(chars, count).string()); |
| #endif |
| |
| hb_buffer_reset(mBuffer); |
| // Note: if we want to set unicode functions, etc., this is the place. |
| |
| hb_buffer_set_direction(mBuffer, isRTL ? HB_DIRECTION_RTL : HB_DIRECTION_LTR); |
| hb_buffer_set_script(mBuffer, run.script); |
| // Should set language here (for bug 7004056) |
| hb_buffer_add_utf16(mBuffer, contextChars, contextCount, start + run.pos, run.length); |
| |
| // Initialize Harfbuzz Shaper and get the base glyph count for offsetting the glyphIDs |
| // and shape the Font run |
| size_t glyphBaseCount = shapeFontRun(paint); |
| unsigned int numGlyphs; |
| hb_glyph_info_t* info = hb_buffer_get_glyph_infos(mBuffer, &numGlyphs); |
| hb_glyph_position_t* positions = hb_buffer_get_glyph_positions(mBuffer, NULL); |
| |
| #if DEBUG_GLYPHS |
| ALOGD("Got from Harfbuzz"); |
| ALOGD(" -- glyphBaseCount = %d", glyphBaseCount); |
| ALOGD(" -- num_glyph = %d", numGlyphs); |
| ALOGD(" -- isDevKernText = %d", paint->isDevKernText()); |
| ALOGD(" -- initial totalAdvance = %f", totalAdvance); |
| |
| logGlyphs(mBuffer); |
| #endif |
| |
| for (size_t i = 0; i < numGlyphs; i++) { |
| size_t cluster = info[i].cluster - start; |
| float xAdvance = HBFixedToFloat(positions[i].x_advance); |
| outAdvances->replaceAt(outAdvances->itemAt(cluster) + xAdvance, cluster); |
| outGlyphs->add(info[i].codepoint + glyphBaseCount); |
| float xo = HBFixedToFloat(positions[i].x_offset); |
| float yo = -HBFixedToFloat(positions[i].y_offset); |
| outPos->add(totalAdvance + xo + yo * skewX); |
| outPos->add(yo); |
| totalAdvance += xAdvance; |
| } |
| } |
| |
| *outTotalAdvance = totalAdvance; |
| |
| #if DEBUG_GLYPHS |
| ALOGD(" -- final totalAdvance = %f", totalAdvance); |
| ALOGD("-------- End of Script Run --------"); |
| #endif |
| } |
| |
| /** |
| * Return the first typeface in the logical change, starting with this typeface, |
| * that contains the specified unichar, or NULL if none is found. |
| * |
| * Note that this function does _not_ increment the reference count on the typeface, as the |
| * assumption is that its lifetime is managed elsewhere - in particular, the fallback typefaces |
| * for the default font live in a global cache. |
| */ |
| SkTypeface* TextLayoutShaper::typefaceForScript(const SkPaint* paint, SkTypeface* typeface, |
| hb_script_t script) { |
| SkTypeface::Style currentStyle = SkTypeface::kNormal; |
| if (typeface) { |
| currentStyle = typeface->style(); |
| } |
| typeface = SkCreateTypefaceForScriptNG(script, currentStyle); |
| #if DEBUG_GLYPHS |
| ALOGD("Using Harfbuzz Script %d, Style %d", script, currentStyle); |
| #endif |
| return typeface; |
| } |
| |
| bool TextLayoutShaper::isComplexScript(hb_script_t script) { |
| switch (script) { |
| case HB_SCRIPT_COMMON: |
| case HB_SCRIPT_GREEK: |
| case HB_SCRIPT_CYRILLIC: |
| case HB_SCRIPT_HANGUL: |
| case HB_SCRIPT_INHERITED: |
| case HB_SCRIPT_HAN: |
| case HB_SCRIPT_KATAKANA: |
| case HB_SCRIPT_HIRAGANA: |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| size_t TextLayoutShaper::shapeFontRun(const SkPaint* paint) { |
| // Update Harfbuzz Shaper |
| |
| SkTypeface* typeface = paint->getTypeface(); |
| |
| // Get the glyphs base count for offsetting the glyphIDs returned by Harfbuzz |
| // This is needed as the Typeface used for shaping can be not the default one |
| // when we are shaping any script that needs to use a fallback Font. |
| // If we are a "common" script we dont need to shift |
| size_t baseGlyphCount = 0; |
| hb_codepoint_t firstUnichar = 0; |
| if (isComplexScript(hb_buffer_get_script(mBuffer))) { |
| unsigned int numGlyphs; |
| hb_glyph_info_t* info = hb_buffer_get_glyph_infos(mBuffer, &numGlyphs); |
| for (size_t i = 0; i < numGlyphs; i++) { |
| firstUnichar = info[i].codepoint; |
| if (firstUnichar != ' ') { |
| break; |
| } |
| } |
| baseGlyphCount = paint->getBaseGlyphCount(firstUnichar); |
| } |
| |
| if (baseGlyphCount != 0) { |
| typeface = typefaceForScript(paint, typeface, hb_buffer_get_script(mBuffer)); |
| if (!typeface) { |
| typeface = mDefaultTypeface; |
| SkSafeRef(typeface); |
| #if DEBUG_GLYPHS |
| ALOGD("Using Default Typeface"); |
| #endif |
| } |
| } else { |
| if (!typeface) { |
| typeface = mDefaultTypeface; |
| #if DEBUG_GLYPHS |
| ALOGD("Using Default Typeface"); |
| #endif |
| } |
| SkSafeRef(typeface); |
| } |
| |
| mShapingPaint.setTypeface(typeface); |
| hb_face_t* face = referenceCachedHBFace(typeface); |
| |
| float sizeY = paint->getTextSize(); |
| float sizeX = sizeY * paint->getTextScaleX(); |
| hb_font_t* font = createFont(face, &mShapingPaint, sizeX, sizeY); |
| hb_face_destroy(face); |
| |
| #if DEBUG_GLYPHS |
| ALOGD("Run typeface = %p, uniqueID = %d, face = %p", |
| typeface, typeface->uniqueID(), face); |
| #endif |
| SkSafeUnref(typeface); |
| |
| hb_shape(font, mBuffer, NULL, 0); |
| hb_font_destroy(font); |
| |
| return baseGlyphCount; |
| } |
| |
| hb_face_t* TextLayoutShaper::referenceCachedHBFace(SkTypeface* typeface) { |
| SkFontID fontId = typeface->uniqueID(); |
| ssize_t index = mCachedHBFaces.indexOfKey(fontId); |
| if (index >= 0) { |
| return hb_face_reference(mCachedHBFaces.valueAt(index)); |
| } |
| // TODO: destroy function |
| hb_face_t* face = hb_face_create_for_tables(harfbuzzSkiaReferenceTable, typeface, NULL); |
| #if DEBUG_GLYPHS |
| ALOGD("Created HB_NewFace %p from paint typeface = %p", face, typeface); |
| #endif |
| mCachedHBFaces.add(fontId, face); |
| return hb_face_reference(face); |
| } |
| |
| void TextLayoutShaper::purgeCaches() { |
| size_t cacheSize = mCachedHBFaces.size(); |
| for (size_t i = 0; i < cacheSize; i++) { |
| hb_face_destroy(mCachedHBFaces.valueAt(i)); |
| } |
| mCachedHBFaces.clear(); |
| unrefTypefaces(); |
| init(); |
| } |
| |
| TextLayoutEngine::TextLayoutEngine() { |
| mShaper = new TextLayoutShaper(); |
| #if USE_TEXT_LAYOUT_CACHE |
| mTextLayoutCache = new TextLayoutCache(mShaper); |
| #else |
| mTextLayoutCache = NULL; |
| #endif |
| } |
| |
| TextLayoutEngine::~TextLayoutEngine() { |
| delete mTextLayoutCache; |
| delete mShaper; |
| } |
| |
| sp<TextLayoutValue> TextLayoutEngine::getValue(const SkPaint* paint, const jchar* text, |
| jint start, jint count, jint contextCount) { |
| sp<TextLayoutValue> value; |
| #if USE_TEXT_LAYOUT_CACHE |
| value = mTextLayoutCache->getValue(paint, text, start, count, |
| contextCount); |
| if (value == NULL) { |
| ALOGE("Cannot get TextLayoutCache value for text = '%s'", |
| String8(text + start, count).string()); |
| } |
| #else |
| value = new TextLayoutValue(count); |
| mShaper->computeValues(value.get(), paint, |
| reinterpret_cast<const UChar*>(text), start, count, contextCount); |
| #endif |
| return value; |
| } |
| |
| void TextLayoutEngine::purgeCaches() { |
| #if USE_TEXT_LAYOUT_CACHE |
| mTextLayoutCache->purgeCaches(); |
| #if DEBUG_GLYPHS |
| ALOGD("Purged TextLayoutEngine caches"); |
| #endif |
| #endif |
| } |
| |
| |
| } // namespace android |