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/*
* 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.
*/
#include "TextLayoutCache.h"
namespace android {
TextLayoutCache::TextLayoutCache():
mCache(GenerationCache<TextLayoutCacheKey, RunAdvanceDescription*>::kUnlimitedCapacity),
mSize(0), mMaxSize(MB(DEFAULT_TEXT_LAYOUT_CACHE_SIZE_IN_MB)),
mCacheHitCount(0), mNanosecondsSaved(0) {
init();
}
TextLayoutCache::TextLayoutCache(uint32_t max):
mCache(GenerationCache<TextLayoutCacheKey, RunAdvanceDescription*>::kUnlimitedCapacity),
mSize(0), mMaxSize(max),
mCacheHitCount(0), mNanosecondsSaved(0) {
init();
}
TextLayoutCache::~TextLayoutCache() {
mCache.clear();
}
void TextLayoutCache::init() {
mCache.setOnEntryRemovedListener(this);
mDebugLevel = readRtlDebugLevel();
mDebugEnabled = mDebugLevel & kRtlDebugCaches;
LOGD("Using TextLayoutCache debug level: %d - Debug Enabled: %d", mDebugLevel, mDebugEnabled);
mCacheStartTime = systemTime(SYSTEM_TIME_MONOTONIC);
if (mDebugEnabled) {
LOGD("TextLayoutCache start time: %lld", mCacheStartTime);
}
mInitialized = true;
if (mDebugEnabled) {
#if RTL_USE_HARFBUZZ
LOGD("TextLayoutCache is using HARFBUZZ");
#else
LOGD("TextLayoutCache is using ICU");
#endif
}
if (mDebugEnabled) {
LOGD("TextLayoutCache initialization is done");
}
}
/*
* Size management
*/
uint32_t TextLayoutCache::getSize() {
return mSize;
}
uint32_t TextLayoutCache::getMaxSize() {
return mMaxSize;
}
void TextLayoutCache::setMaxSize(uint32_t maxSize) {
mMaxSize = maxSize;
removeOldests();
}
void TextLayoutCache::removeOldests() {
while (mSize > mMaxSize) {
mCache.removeOldest();
}
}
/**
* Callbacks
*/
void TextLayoutCache::operator()(TextLayoutCacheKey& text, RunAdvanceDescription*& desc) {
if (desc) {
size_t totalSizeToDelete = text.getSize() + desc->getSize();
mSize -= totalSizeToDelete;
if (mDebugEnabled) {
LOGD("RunAdvance description deleted, size = %d", totalSizeToDelete);
}
delete desc;
}
}
/*
* Cache clearing
*/
void TextLayoutCache::clear() {
mCache.clear();
}
/*
* Caching
*/
void TextLayoutCache::getRunAdvances(SkPaint* paint, const jchar* text,
jint start, jint count, jint contextCount, jint dirFlags,
jfloat* outAdvances, jfloat* outTotalAdvance) {
AutoMutex _l(mLock);
nsecs_t startTime = 0;
if (mDebugEnabled) {
startTime = systemTime(SYSTEM_TIME_MONOTONIC);
}
TextLayoutCacheKey entry(paint, text, start, count, contextCount, dirFlags);
// Get entry for cache if possible
RunAdvanceDescription* desc = mCache.get(entry);
// Value not found for the entry, we need to add a new value in the cache
if (!desc) {
desc = new RunAdvanceDescription();
// Compute advances and store them
desc->computeAdvances(paint, text, start, count, contextCount, dirFlags);
desc->copyResult(outAdvances, outTotalAdvance);
// Don't bother to add in the cache if the entry is too big
size_t size = entry.getSize() + desc->getSize();
if (size <= mMaxSize) {
// Cleanup to make some room if needed
if (mSize + size > mMaxSize) {
if (mDebugEnabled) {
LOGD("TextLayoutCache: need to clean some entries "
"for making some room for a new entry");
}
while (mSize + size > mMaxSize) {
// This will call the callback
mCache.removeOldest();
}
}
// Update current cache size
mSize += size;
// Copy the text when we insert the new entry
entry.internalTextCopy();
mCache.put(entry, desc);
if (mDebugEnabled) {
// Update timing information for statistics.
desc->setElapsedTime(systemTime(SYSTEM_TIME_MONOTONIC) - startTime);
LOGD("CACHE MISS: Added entry for text='%s' with start=%d, count=%d, "
"contextCount=%d, entry size %d bytes, remaining space %d bytes"
" - Compute time in nanos: %d",
String8(text, contextCount).string(), start, count, contextCount,
size, mMaxSize - mSize, desc->getElapsedTime());
}
} else {
if (mDebugEnabled) {
LOGD("CACHE MISS: Calculated but not storing entry because it is too big "
"for text='%s' with start=%d, count=%d, contextCount=%d, "
"entry size %d bytes, remaining space %d bytes"
" - Compute time in nanos: %d",
String8(text, contextCount).string(), start, count, contextCount,
size, mMaxSize - mSize, desc->getElapsedTime());
}
delete desc;
}
} else {
// This is a cache hit, just copy the pre-computed results
desc->copyResult(outAdvances, outTotalAdvance);
if (mDebugEnabled) {
nsecs_t elapsedTimeThruCacheGet = systemTime(SYSTEM_TIME_MONOTONIC) - startTime;
mNanosecondsSaved += (desc->getElapsedTime() - elapsedTimeThruCacheGet);
++mCacheHitCount;
if (desc->getElapsedTime() > 0) {
float deltaPercent = 100 * ((desc->getElapsedTime() - elapsedTimeThruCacheGet)
/ ((float)desc->getElapsedTime()));
LOGD("CACHE HIT #%d for text='%s' with start=%d, count=%d, contextCount=%d "
"- Compute time in nanos: %d - "
"Cache get time in nanos: %lld - Gain in percent: %2.2f",
mCacheHitCount, String8(text, contextCount).string(), start, count,
contextCount,
desc->getElapsedTime(), elapsedTimeThruCacheGet, deltaPercent);
}
if (mCacheHitCount % DEFAULT_DUMP_STATS_CACHE_HIT_INTERVAL == 0) {
dumpCacheStats();
}
}
}
}
void TextLayoutCache::dumpCacheStats() {
float remainingPercent = 100 * ((mMaxSize - mSize) / ((float)mMaxSize));
float timeRunningInSec = (systemTime(SYSTEM_TIME_MONOTONIC) - mCacheStartTime) / 1000000000;
LOGD("------------------------------------------------");
LOGD("TextLayoutCache stats");
LOGD("------------------------------------------------");
LOGD("running : %.0f seconds", timeRunningInSec);
LOGD("size : %d bytes", mMaxSize);
LOGD("remaining : %d bytes or %2.2f percent", mMaxSize - mSize, remainingPercent);
LOGD("hits : %d", mCacheHitCount);
LOGD("saved : %lld milliseconds", mNanosecondsSaved / 1000000);
LOGD("------------------------------------------------");
}
} // namespace android
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