1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkGlyphCache.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,718 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkGlyphCache.h"
1.14 +#include "SkGlyphCache_Globals.h"
1.15 +#include "SkGraphics.h"
1.16 +#include "SkPaint.h"
1.17 +#include "SkPath.h"
1.18 +#include "SkTemplates.h"
1.19 +#include "SkTLS.h"
1.20 +#include "SkTypeface.h"
1.21 +
1.22 +//#define SPEW_PURGE_STATUS
1.23 +//#define RECORD_HASH_EFFICIENCY
1.24 +
1.25 +bool gSkSuppressFontCachePurgeSpew;
1.26 +
1.27 +// Returns the shared globals
1.28 +static SkGlyphCache_Globals& getSharedGlobals() {
1.29 + // we leak this, so we don't incur any shutdown cost of the destructor
1.30 + static SkGlyphCache_Globals* gGlobals = SkNEW_ARGS(SkGlyphCache_Globals,
1.31 + (SkGlyphCache_Globals::kYes_UseMutex));
1.32 + return *gGlobals;
1.33 +}
1.34 +
1.35 +// Returns the TLS globals (if set), or the shared globals
1.36 +static SkGlyphCache_Globals& getGlobals() {
1.37 + SkGlyphCache_Globals* tls = SkGlyphCache_Globals::FindTLS();
1.38 + return tls ? *tls : getSharedGlobals();
1.39 +}
1.40 +
1.41 +///////////////////////////////////////////////////////////////////////////////
1.42 +
1.43 +#ifdef RECORD_HASH_EFFICIENCY
1.44 + static uint32_t gHashSuccess;
1.45 + static uint32_t gHashCollision;
1.46 +
1.47 + static void RecordHashSuccess() {
1.48 + gHashSuccess += 1;
1.49 + }
1.50 +
1.51 + static void RecordHashCollisionIf(bool pred) {
1.52 + if (pred) {
1.53 + gHashCollision += 1;
1.54 +
1.55 + uint32_t total = gHashSuccess + gHashCollision;
1.56 + SkDebugf("Font Cache Hash success rate: %d%%\n",
1.57 + 100 * gHashSuccess / total);
1.58 + }
1.59 + }
1.60 +#else
1.61 + #define RecordHashSuccess() (void)0
1.62 + #define RecordHashCollisionIf(pred) (void)0
1.63 +#endif
1.64 +#define RecordHashCollision() RecordHashCollisionIf(true)
1.65 +
1.66 +///////////////////////////////////////////////////////////////////////////////
1.67 +
1.68 +// so we don't grow our arrays a lot
1.69 +#define kMinGlyphCount 16
1.70 +#define kMinGlyphImageSize (16*2)
1.71 +#define kMinAllocAmount ((sizeof(SkGlyph) + kMinGlyphImageSize) * kMinGlyphCount)
1.72 +
1.73 +SkGlyphCache::SkGlyphCache(SkTypeface* typeface, const SkDescriptor* desc, SkScalerContext* ctx)
1.74 + : fScalerContext(ctx), fGlyphAlloc(kMinAllocAmount) {
1.75 + SkASSERT(typeface);
1.76 + SkASSERT(desc);
1.77 + SkASSERT(ctx);
1.78 +
1.79 + fPrev = fNext = NULL;
1.80 +
1.81 + fDesc = desc->copy();
1.82 + fScalerContext->getFontMetrics(&fFontMetrics);
1.83 +
1.84 + // init to 0 so that all of the pointers will be null
1.85 + memset(fGlyphHash, 0, sizeof(fGlyphHash));
1.86 + // init with 0xFF so that the charCode field will be -1, which is invalid
1.87 + memset(fCharToGlyphHash, 0xFF, sizeof(fCharToGlyphHash));
1.88 +
1.89 + fMemoryUsed = sizeof(*this);
1.90 +
1.91 + fGlyphArray.setReserve(kMinGlyphCount);
1.92 +
1.93 + fAuxProcList = NULL;
1.94 +}
1.95 +
1.96 +SkGlyphCache::~SkGlyphCache() {
1.97 +#if 0
1.98 + {
1.99 + size_t ptrMem = fGlyphArray.count() * sizeof(SkGlyph*);
1.100 + size_t glyphAlloc = fGlyphAlloc.totalCapacity();
1.101 + size_t glyphHashUsed = 0;
1.102 + size_t uniHashUsed = 0;
1.103 + for (int i = 0; i < kHashCount; ++i) {
1.104 + glyphHashUsed += fGlyphHash[i] ? sizeof(fGlyphHash[0]) : 0;
1.105 + uniHashUsed += fCharToGlyphHash[i].fID != 0xFFFFFFFF ? sizeof(fCharToGlyphHash[0]) : 0;
1.106 + }
1.107 + size_t glyphUsed = fGlyphArray.count() * sizeof(SkGlyph);
1.108 + size_t imageUsed = 0;
1.109 + for (int i = 0; i < fGlyphArray.count(); ++i) {
1.110 + const SkGlyph& g = *fGlyphArray[i];
1.111 + if (g.fImage) {
1.112 + imageUsed += g.fHeight * g.rowBytes();
1.113 + }
1.114 + }
1.115 +
1.116 + printf("glyphPtrArray,%zu, Alloc,%zu, imageUsed,%zu, glyphUsed,%zu, glyphHashAlloc,%zu, glyphHashUsed,%zu, unicharHashAlloc,%zu, unicharHashUsed,%zu\n",
1.117 + ptrMem, glyphAlloc, imageUsed, glyphUsed, sizeof(fGlyphHash), glyphHashUsed, sizeof(fCharToGlyphHash), uniHashUsed);
1.118 +
1.119 + }
1.120 +#endif
1.121 + SkGlyph** gptr = fGlyphArray.begin();
1.122 + SkGlyph** stop = fGlyphArray.end();
1.123 + while (gptr < stop) {
1.124 + SkPath* path = (*gptr)->fPath;
1.125 + if (path) {
1.126 + SkDELETE(path);
1.127 + }
1.128 + gptr += 1;
1.129 + }
1.130 + SkDescriptor::Free(fDesc);
1.131 + SkDELETE(fScalerContext);
1.132 + this->invokeAndRemoveAuxProcs();
1.133 +}
1.134 +
1.135 +///////////////////////////////////////////////////////////////////////////////
1.136 +
1.137 +#ifdef SK_DEBUG
1.138 +#define VALIDATE() AutoValidate av(this)
1.139 +#else
1.140 +#define VALIDATE()
1.141 +#endif
1.142 +
1.143 +uint16_t SkGlyphCache::unicharToGlyph(SkUnichar charCode) {
1.144 + VALIDATE();
1.145 + uint32_t id = SkGlyph::MakeID(charCode);
1.146 + const CharGlyphRec& rec = fCharToGlyphHash[ID2HashIndex(id)];
1.147 +
1.148 + if (rec.fID == id) {
1.149 + return rec.fGlyph->getGlyphID();
1.150 + } else {
1.151 + return fScalerContext->charToGlyphID(charCode);
1.152 + }
1.153 +}
1.154 +
1.155 +SkUnichar SkGlyphCache::glyphToUnichar(uint16_t glyphID) {
1.156 + return fScalerContext->glyphIDToChar(glyphID);
1.157 +}
1.158 +
1.159 +unsigned SkGlyphCache::getGlyphCount() {
1.160 + return fScalerContext->getGlyphCount();
1.161 +}
1.162 +
1.163 +///////////////////////////////////////////////////////////////////////////////
1.164 +
1.165 +const SkGlyph& SkGlyphCache::getUnicharAdvance(SkUnichar charCode) {
1.166 + VALIDATE();
1.167 + uint32_t id = SkGlyph::MakeID(charCode);
1.168 + CharGlyphRec* rec = &fCharToGlyphHash[ID2HashIndex(id)];
1.169 +
1.170 + if (rec->fID != id) {
1.171 + // this ID is based on the UniChar
1.172 + rec->fID = id;
1.173 + // this ID is based on the glyph index
1.174 + id = SkGlyph::MakeID(fScalerContext->charToGlyphID(charCode));
1.175 + rec->fGlyph = this->lookupMetrics(id, kJustAdvance_MetricsType);
1.176 + }
1.177 + return *rec->fGlyph;
1.178 +}
1.179 +
1.180 +const SkGlyph& SkGlyphCache::getGlyphIDAdvance(uint16_t glyphID) {
1.181 + VALIDATE();
1.182 + uint32_t id = SkGlyph::MakeID(glyphID);
1.183 + unsigned index = ID2HashIndex(id);
1.184 + SkGlyph* glyph = fGlyphHash[index];
1.185 +
1.186 + if (NULL == glyph || glyph->fID != id) {
1.187 + glyph = this->lookupMetrics(glyphID, kJustAdvance_MetricsType);
1.188 + fGlyphHash[index] = glyph;
1.189 + }
1.190 + return *glyph;
1.191 +}
1.192 +
1.193 +///////////////////////////////////////////////////////////////////////////////
1.194 +
1.195 +const SkGlyph& SkGlyphCache::getUnicharMetrics(SkUnichar charCode) {
1.196 + VALIDATE();
1.197 + uint32_t id = SkGlyph::MakeID(charCode);
1.198 + CharGlyphRec* rec = &fCharToGlyphHash[ID2HashIndex(id)];
1.199 +
1.200 + if (rec->fID != id) {
1.201 + RecordHashCollisionIf(rec->fGlyph != NULL);
1.202 + // this ID is based on the UniChar
1.203 + rec->fID = id;
1.204 + // this ID is based on the glyph index
1.205 + id = SkGlyph::MakeID(fScalerContext->charToGlyphID(charCode));
1.206 + rec->fGlyph = this->lookupMetrics(id, kFull_MetricsType);
1.207 + } else {
1.208 + RecordHashSuccess();
1.209 + if (rec->fGlyph->isJustAdvance()) {
1.210 + fScalerContext->getMetrics(rec->fGlyph);
1.211 + }
1.212 + }
1.213 + SkASSERT(rec->fGlyph->isFullMetrics());
1.214 + return *rec->fGlyph;
1.215 +}
1.216 +
1.217 +const SkGlyph& SkGlyphCache::getUnicharMetrics(SkUnichar charCode,
1.218 + SkFixed x, SkFixed y) {
1.219 + VALIDATE();
1.220 + uint32_t id = SkGlyph::MakeID(charCode, x, y);
1.221 + CharGlyphRec* rec = &fCharToGlyphHash[ID2HashIndex(id)];
1.222 +
1.223 + if (rec->fID != id) {
1.224 + RecordHashCollisionIf(rec->fGlyph != NULL);
1.225 + // this ID is based on the UniChar
1.226 + rec->fID = id;
1.227 + // this ID is based on the glyph index
1.228 + id = SkGlyph::MakeID(fScalerContext->charToGlyphID(charCode), x, y);
1.229 + rec->fGlyph = this->lookupMetrics(id, kFull_MetricsType);
1.230 + } else {
1.231 + RecordHashSuccess();
1.232 + if (rec->fGlyph->isJustAdvance()) {
1.233 + fScalerContext->getMetrics(rec->fGlyph);
1.234 + }
1.235 + }
1.236 + SkASSERT(rec->fGlyph->isFullMetrics());
1.237 + return *rec->fGlyph;
1.238 +}
1.239 +
1.240 +const SkGlyph& SkGlyphCache::getGlyphIDMetrics(uint16_t glyphID) {
1.241 + VALIDATE();
1.242 + uint32_t id = SkGlyph::MakeID(glyphID);
1.243 + unsigned index = ID2HashIndex(id);
1.244 + SkGlyph* glyph = fGlyphHash[index];
1.245 +
1.246 + if (NULL == glyph || glyph->fID != id) {
1.247 + RecordHashCollisionIf(glyph != NULL);
1.248 + glyph = this->lookupMetrics(glyphID, kFull_MetricsType);
1.249 + fGlyphHash[index] = glyph;
1.250 + } else {
1.251 + RecordHashSuccess();
1.252 + if (glyph->isJustAdvance()) {
1.253 + fScalerContext->getMetrics(glyph);
1.254 + }
1.255 + }
1.256 + SkASSERT(glyph->isFullMetrics());
1.257 + return *glyph;
1.258 +}
1.259 +
1.260 +const SkGlyph& SkGlyphCache::getGlyphIDMetrics(uint16_t glyphID,
1.261 + SkFixed x, SkFixed y) {
1.262 + VALIDATE();
1.263 + uint32_t id = SkGlyph::MakeID(glyphID, x, y);
1.264 + unsigned index = ID2HashIndex(id);
1.265 + SkGlyph* glyph = fGlyphHash[index];
1.266 +
1.267 + if (NULL == glyph || glyph->fID != id) {
1.268 + RecordHashCollisionIf(glyph != NULL);
1.269 + glyph = this->lookupMetrics(id, kFull_MetricsType);
1.270 + fGlyphHash[index] = glyph;
1.271 + } else {
1.272 + RecordHashSuccess();
1.273 + if (glyph->isJustAdvance()) {
1.274 + fScalerContext->getMetrics(glyph);
1.275 + }
1.276 + }
1.277 + SkASSERT(glyph->isFullMetrics());
1.278 + return *glyph;
1.279 +}
1.280 +
1.281 +SkGlyph* SkGlyphCache::lookupMetrics(uint32_t id, MetricsType mtype) {
1.282 + SkGlyph* glyph;
1.283 +
1.284 + int hi = 0;
1.285 + int count = fGlyphArray.count();
1.286 +
1.287 + if (count) {
1.288 + SkGlyph** gptr = fGlyphArray.begin();
1.289 + int lo = 0;
1.290 +
1.291 + hi = count - 1;
1.292 + while (lo < hi) {
1.293 + int mid = (hi + lo) >> 1;
1.294 + if (gptr[mid]->fID < id) {
1.295 + lo = mid + 1;
1.296 + } else {
1.297 + hi = mid;
1.298 + }
1.299 + }
1.300 + glyph = gptr[hi];
1.301 + if (glyph->fID == id) {
1.302 + if (kFull_MetricsType == mtype && glyph->isJustAdvance()) {
1.303 + fScalerContext->getMetrics(glyph);
1.304 + }
1.305 + return glyph;
1.306 + }
1.307 +
1.308 + // check if we need to bump hi before falling though to the allocator
1.309 + if (glyph->fID < id) {
1.310 + hi += 1;
1.311 + }
1.312 + }
1.313 +
1.314 + // not found, but hi tells us where to inser the new glyph
1.315 + fMemoryUsed += sizeof(SkGlyph);
1.316 +
1.317 + glyph = (SkGlyph*)fGlyphAlloc.alloc(sizeof(SkGlyph),
1.318 + SkChunkAlloc::kThrow_AllocFailType);
1.319 + glyph->init(id);
1.320 + *fGlyphArray.insert(hi) = glyph;
1.321 +
1.322 + if (kJustAdvance_MetricsType == mtype) {
1.323 + fScalerContext->getAdvance(glyph);
1.324 + } else {
1.325 + SkASSERT(kFull_MetricsType == mtype);
1.326 + fScalerContext->getMetrics(glyph);
1.327 + }
1.328 +
1.329 + return glyph;
1.330 +}
1.331 +
1.332 +const void* SkGlyphCache::findImage(const SkGlyph& glyph) {
1.333 + if (glyph.fWidth > 0 && glyph.fWidth < kMaxGlyphWidth) {
1.334 + if (glyph.fImage == NULL) {
1.335 + size_t size = glyph.computeImageSize();
1.336 + const_cast<SkGlyph&>(glyph).fImage = fGlyphAlloc.alloc(size,
1.337 + SkChunkAlloc::kReturnNil_AllocFailType);
1.338 + // check that alloc() actually succeeded
1.339 + if (glyph.fImage) {
1.340 + fScalerContext->getImage(glyph);
1.341 + // TODO: the scaler may have changed the maskformat during
1.342 + // getImage (e.g. from AA or LCD to BW) which means we may have
1.343 + // overallocated the buffer. Check if the new computedImageSize
1.344 + // is smaller, and if so, strink the alloc size in fImageAlloc.
1.345 + fMemoryUsed += size;
1.346 + }
1.347 + }
1.348 + }
1.349 + return glyph.fImage;
1.350 +}
1.351 +
1.352 +const SkPath* SkGlyphCache::findPath(const SkGlyph& glyph) {
1.353 + if (glyph.fWidth) {
1.354 + if (glyph.fPath == NULL) {
1.355 + const_cast<SkGlyph&>(glyph).fPath = SkNEW(SkPath);
1.356 + fScalerContext->getPath(glyph, glyph.fPath);
1.357 + fMemoryUsed += sizeof(SkPath) +
1.358 + glyph.fPath->countPoints() * sizeof(SkPoint);
1.359 + }
1.360 + }
1.361 + return glyph.fPath;
1.362 +}
1.363 +
1.364 +///////////////////////////////////////////////////////////////////////////////
1.365 +
1.366 +bool SkGlyphCache::getAuxProcData(void (*proc)(void*), void** dataPtr) const {
1.367 + const AuxProcRec* rec = fAuxProcList;
1.368 + while (rec) {
1.369 + if (rec->fProc == proc) {
1.370 + if (dataPtr) {
1.371 + *dataPtr = rec->fData;
1.372 + }
1.373 + return true;
1.374 + }
1.375 + rec = rec->fNext;
1.376 + }
1.377 + return false;
1.378 +}
1.379 +
1.380 +void SkGlyphCache::setAuxProc(void (*proc)(void*), void* data) {
1.381 + if (proc == NULL) {
1.382 + return;
1.383 + }
1.384 +
1.385 + AuxProcRec* rec = fAuxProcList;
1.386 + while (rec) {
1.387 + if (rec->fProc == proc) {
1.388 + rec->fData = data;
1.389 + return;
1.390 + }
1.391 + rec = rec->fNext;
1.392 + }
1.393 + // not found, create a new rec
1.394 + rec = SkNEW(AuxProcRec);
1.395 + rec->fProc = proc;
1.396 + rec->fData = data;
1.397 + rec->fNext = fAuxProcList;
1.398 + fAuxProcList = rec;
1.399 +}
1.400 +
1.401 +void SkGlyphCache::invokeAndRemoveAuxProcs() {
1.402 + AuxProcRec* rec = fAuxProcList;
1.403 + while (rec) {
1.404 + rec->fProc(rec->fData);
1.405 + AuxProcRec* next = rec->fNext;
1.406 + SkDELETE(rec);
1.407 + rec = next;
1.408 + }
1.409 +}
1.410 +
1.411 +///////////////////////////////////////////////////////////////////////////////
1.412 +///////////////////////////////////////////////////////////////////////////////
1.413 +
1.414 +#include "SkThread.h"
1.415 +
1.416 +size_t SkGlyphCache_Globals::setCacheSizeLimit(size_t newLimit) {
1.417 + static const size_t minLimit = 256 * 1024;
1.418 + if (newLimit < minLimit) {
1.419 + newLimit = minLimit;
1.420 + }
1.421 +
1.422 + SkAutoMutexAcquire ac(fMutex);
1.423 +
1.424 + size_t prevLimit = fCacheSizeLimit;
1.425 + fCacheSizeLimit = newLimit;
1.426 + this->internalPurge();
1.427 + return prevLimit;
1.428 +}
1.429 +
1.430 +int SkGlyphCache_Globals::setCacheCountLimit(int newCount) {
1.431 + if (newCount < 0) {
1.432 + newCount = 0;
1.433 + }
1.434 +
1.435 + SkAutoMutexAcquire ac(fMutex);
1.436 +
1.437 + int prevCount = fCacheCountLimit;
1.438 + fCacheCountLimit = newCount;
1.439 + this->internalPurge();
1.440 + return prevCount;
1.441 +}
1.442 +
1.443 +void SkGlyphCache_Globals::purgeAll() {
1.444 + SkAutoMutexAcquire ac(fMutex);
1.445 + this->internalPurge(fTotalMemoryUsed);
1.446 +}
1.447 +
1.448 +void SkGlyphCache::VisitAllCaches(bool (*proc)(SkGlyphCache*, void*),
1.449 + void* context) {
1.450 + SkGlyphCache_Globals& globals = getGlobals();
1.451 + SkAutoMutexAcquire ac(globals.fMutex);
1.452 + SkGlyphCache* cache;
1.453 +
1.454 + globals.validate();
1.455 +
1.456 + for (cache = globals.internalGetHead(); cache != NULL; cache = cache->fNext) {
1.457 + if (proc(cache, context)) {
1.458 + break;
1.459 + }
1.460 + }
1.461 +
1.462 + globals.validate();
1.463 +}
1.464 +
1.465 +/* This guy calls the visitor from within the mutext lock, so the visitor
1.466 + cannot:
1.467 + - take too much time
1.468 + - try to acquire the mutext again
1.469 + - call a fontscaler (which might call into the cache)
1.470 +*/
1.471 +SkGlyphCache* SkGlyphCache::VisitCache(SkTypeface* typeface,
1.472 + const SkDescriptor* desc,
1.473 + bool (*proc)(const SkGlyphCache*, void*),
1.474 + void* context) {
1.475 + if (!typeface) {
1.476 + typeface = SkTypeface::GetDefaultTypeface();
1.477 + }
1.478 + SkASSERT(desc);
1.479 +
1.480 + SkGlyphCache_Globals& globals = getGlobals();
1.481 + SkAutoMutexAcquire ac(globals.fMutex);
1.482 + SkGlyphCache* cache;
1.483 + bool insideMutex = true;
1.484 +
1.485 + globals.validate();
1.486 +
1.487 + for (cache = globals.internalGetHead(); cache != NULL; cache = cache->fNext) {
1.488 + if (cache->fDesc->equals(*desc)) {
1.489 + globals.internalDetachCache(cache);
1.490 + goto FOUND_IT;
1.491 + }
1.492 + }
1.493 +
1.494 + /* Release the mutex now, before we create a new entry (which might have
1.495 + side-effects like trying to access the cache/mutex (yikes!)
1.496 + */
1.497 + ac.release(); // release the mutex now
1.498 + insideMutex = false; // can't use globals anymore
1.499 +
1.500 + // Check if we can create a scaler-context before creating the glyphcache.
1.501 + // If not, we may have exhausted OS/font resources, so try purging the
1.502 + // cache once and try again.
1.503 + {
1.504 + // pass true the first time, to notice if the scalercontext failed,
1.505 + // so we can try the purge.
1.506 + SkScalerContext* ctx = typeface->createScalerContext(desc, true);
1.507 + if (!ctx) {
1.508 + getSharedGlobals().purgeAll();
1.509 + ctx = typeface->createScalerContext(desc, false);
1.510 + SkASSERT(ctx);
1.511 + }
1.512 + cache = SkNEW_ARGS(SkGlyphCache, (typeface, desc, ctx));
1.513 + }
1.514 +
1.515 +FOUND_IT:
1.516 +
1.517 + AutoValidate av(cache);
1.518 +
1.519 + if (!proc(cache, context)) { // need to reattach
1.520 + if (insideMutex) {
1.521 + globals.internalAttachCacheToHead(cache);
1.522 + } else {
1.523 + globals.attachCacheToHead(cache);
1.524 + }
1.525 + cache = NULL;
1.526 + }
1.527 + return cache;
1.528 +}
1.529 +
1.530 +void SkGlyphCache::AttachCache(SkGlyphCache* cache) {
1.531 + SkASSERT(cache);
1.532 + SkASSERT(cache->fNext == NULL);
1.533 +
1.534 + getGlobals().attachCacheToHead(cache);
1.535 +}
1.536 +
1.537 +///////////////////////////////////////////////////////////////////////////////
1.538 +
1.539 +void SkGlyphCache_Globals::attachCacheToHead(SkGlyphCache* cache) {
1.540 + SkAutoMutexAcquire ac(fMutex);
1.541 +
1.542 + this->validate();
1.543 + cache->validate();
1.544 +
1.545 + this->internalAttachCacheToHead(cache);
1.546 + this->internalPurge();
1.547 +}
1.548 +
1.549 +SkGlyphCache* SkGlyphCache_Globals::internalGetTail() const {
1.550 + SkGlyphCache* cache = fHead;
1.551 + if (cache) {
1.552 + while (cache->fNext) {
1.553 + cache = cache->fNext;
1.554 + }
1.555 + }
1.556 + return cache;
1.557 +}
1.558 +
1.559 +size_t SkGlyphCache_Globals::internalPurge(size_t minBytesNeeded) {
1.560 + this->validate();
1.561 +
1.562 + size_t bytesNeeded = 0;
1.563 + if (fTotalMemoryUsed > fCacheSizeLimit) {
1.564 + bytesNeeded = fTotalMemoryUsed - fCacheSizeLimit;
1.565 + }
1.566 + bytesNeeded = SkTMax(bytesNeeded, minBytesNeeded);
1.567 + if (bytesNeeded) {
1.568 + // no small purges!
1.569 + bytesNeeded = SkTMax(bytesNeeded, fTotalMemoryUsed >> 2);
1.570 + }
1.571 +
1.572 + int countNeeded = 0;
1.573 + if (fCacheCount > fCacheCountLimit) {
1.574 + countNeeded = fCacheCount - fCacheCountLimit;
1.575 + // no small purges!
1.576 + countNeeded = SkMax32(countNeeded, fCacheCount >> 2);
1.577 + }
1.578 +
1.579 + // early exit
1.580 + if (!countNeeded && !bytesNeeded) {
1.581 + return 0;
1.582 + }
1.583 +
1.584 + size_t bytesFreed = 0;
1.585 + int countFreed = 0;
1.586 +
1.587 + // we start at the tail and proceed backwards, as the linklist is in LRU
1.588 + // order, with unimportant entries at the tail.
1.589 + SkGlyphCache* cache = this->internalGetTail();
1.590 + while (cache != NULL &&
1.591 + (bytesFreed < bytesNeeded || countFreed < countNeeded)) {
1.592 + SkGlyphCache* prev = cache->fPrev;
1.593 + bytesFreed += cache->fMemoryUsed;
1.594 + countFreed += 1;
1.595 +
1.596 + this->internalDetachCache(cache);
1.597 + SkDELETE(cache);
1.598 + cache = prev;
1.599 + }
1.600 +
1.601 + this->validate();
1.602 +
1.603 +#ifdef SPEW_PURGE_STATUS
1.604 + if (countFreed && !gSkSuppressFontCachePurgeSpew) {
1.605 + SkDebugf("purging %dK from font cache [%d entries]\n",
1.606 + (int)(bytesFreed >> 10), countFreed);
1.607 + }
1.608 +#endif
1.609 +
1.610 + return bytesFreed;
1.611 +}
1.612 +
1.613 +void SkGlyphCache_Globals::internalAttachCacheToHead(SkGlyphCache* cache) {
1.614 + SkASSERT(NULL == cache->fPrev && NULL == cache->fNext);
1.615 + if (fHead) {
1.616 + fHead->fPrev = cache;
1.617 + cache->fNext = fHead;
1.618 + }
1.619 + fHead = cache;
1.620 +
1.621 + fCacheCount += 1;
1.622 + fTotalMemoryUsed += cache->fMemoryUsed;
1.623 +}
1.624 +
1.625 +void SkGlyphCache_Globals::internalDetachCache(SkGlyphCache* cache) {
1.626 + SkASSERT(fCacheCount > 0);
1.627 + fCacheCount -= 1;
1.628 + fTotalMemoryUsed -= cache->fMemoryUsed;
1.629 +
1.630 + if (cache->fPrev) {
1.631 + cache->fPrev->fNext = cache->fNext;
1.632 + } else {
1.633 + fHead = cache->fNext;
1.634 + }
1.635 + if (cache->fNext) {
1.636 + cache->fNext->fPrev = cache->fPrev;
1.637 + }
1.638 + cache->fPrev = cache->fNext = NULL;
1.639 +}
1.640 +
1.641 +///////////////////////////////////////////////////////////////////////////////
1.642 +
1.643 +#ifdef SK_DEBUG
1.644 +
1.645 +void SkGlyphCache::validate() const {
1.646 +#ifdef SK_DEBUG_GLYPH_CACHE
1.647 + int count = fGlyphArray.count();
1.648 + for (int i = 0; i < count; i++) {
1.649 + const SkGlyph* glyph = fGlyphArray[i];
1.650 + SkASSERT(glyph);
1.651 + SkASSERT(fGlyphAlloc.contains(glyph));
1.652 + if (glyph->fImage) {
1.653 + SkASSERT(fGlyphAlloc.contains(glyph->fImage));
1.654 + }
1.655 + }
1.656 +#endif
1.657 +}
1.658 +
1.659 +void SkGlyphCache_Globals::validate() const {
1.660 + size_t computedBytes = 0;
1.661 + int computedCount = 0;
1.662 +
1.663 + const SkGlyphCache* head = fHead;
1.664 + while (head != NULL) {
1.665 + computedBytes += head->fMemoryUsed;
1.666 + computedCount += 1;
1.667 + head = head->fNext;
1.668 + }
1.669 +
1.670 + SkASSERT(fTotalMemoryUsed == computedBytes);
1.671 + SkASSERT(fCacheCount == computedCount);
1.672 +}
1.673 +
1.674 +#endif
1.675 +
1.676 +///////////////////////////////////////////////////////////////////////////////
1.677 +///////////////////////////////////////////////////////////////////////////////
1.678 +
1.679 +#include "SkTypefaceCache.h"
1.680 +
1.681 +size_t SkGraphics::GetFontCacheLimit() {
1.682 + return getSharedGlobals().getCacheSizeLimit();
1.683 +}
1.684 +
1.685 +size_t SkGraphics::SetFontCacheLimit(size_t bytes) {
1.686 + return getSharedGlobals().setCacheSizeLimit(bytes);
1.687 +}
1.688 +
1.689 +size_t SkGraphics::GetFontCacheUsed() {
1.690 + return getSharedGlobals().getTotalMemoryUsed();
1.691 +}
1.692 +
1.693 +int SkGraphics::GetFontCacheCountLimit() {
1.694 + return getSharedGlobals().getCacheCountLimit();
1.695 +}
1.696 +
1.697 +int SkGraphics::SetFontCacheCountLimit(int count) {
1.698 + return getSharedGlobals().setCacheCountLimit(count);
1.699 +}
1.700 +
1.701 +int SkGraphics::GetFontCacheCountUsed() {
1.702 + return getSharedGlobals().getCacheCountUsed();
1.703 +}
1.704 +
1.705 +void SkGraphics::PurgeFontCache() {
1.706 + getSharedGlobals().purgeAll();
1.707 + SkTypefaceCache::PurgeAll();
1.708 +}
1.709 +
1.710 +size_t SkGraphics::GetTLSFontCacheLimit() {
1.711 + const SkGlyphCache_Globals* tls = SkGlyphCache_Globals::FindTLS();
1.712 + return tls ? tls->getCacheSizeLimit() : 0;
1.713 +}
1.714 +
1.715 +void SkGraphics::SetTLSFontCacheLimit(size_t bytes) {
1.716 + if (0 == bytes) {
1.717 + SkGlyphCache_Globals::DeleteTLS();
1.718 + } else {
1.719 + SkGlyphCache_Globals::GetTLS().setCacheSizeLimit(bytes);
1.720 + }
1.721 +}
