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Lazily allocate our global pool for imagerefs

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Review URL: https://codereview.appspot.com/5677055

git-svn-id: http://skia.googlecode.com/svn/trunk@3211 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2012-02-16 20:04:31 +00:00
parent 302b861338
commit 7294886980
1 changed files with 30 additions and 12 deletions
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40
src/images/SkImageRef_GlobalPool.cpp
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@ -11,23 +11,39 @@
extern SkBaseMutex gImageRefMutex;
static SkImageRefPool gGlobalImageRefPool;
/*
* This returns the lazily-allocated global pool. It must be called
* from inside the guard mutex, so we safely only ever allocate 1.
*/
static SkImageRefPool* GetGlobalPool() {
static SkImageRefPool* gPool;
if (NULL == gPool) {
gPool = SkNEW(SkImageRefPool);
// call sk_atexit(...) when we have that, to free the global pool
}
return gPool;
}
SkImageRef_GlobalPool::SkImageRef_GlobalPool(SkStream* stream,
SkBitmap::Config config,
int sampleSize)
: SkImageRef(stream, config, sampleSize) {
this->mutex()->acquire();
gGlobalImageRefPool.addToHead(this);
GetGlobalPool()->addToHead(this);
this->mutex()->release();
}
SkImageRef_GlobalPool::~SkImageRef_GlobalPool() {
this->mutex()->acquire();
gGlobalImageRefPool.detach(this);
GetGlobalPool()->detach(this);
this->mutex()->release();
}
/* By design, onUnlockPixels() already is inside the mutex-lock,
* and it is the (indirect) caller of onDecode(), therefore we can assume
* that we also are already inside the mutex. Hence, we can reference
* the global-pool directly.
*/
bool SkImageRef_GlobalPool::onDecode(SkImageDecoder* codec, SkStream* stream,
SkBitmap* bitmap, SkBitmap::Config config,
SkImageDecoder::Mode mode) {
@ -35,7 +51,8 @@ bool SkImageRef_GlobalPool::onDecode(SkImageDecoder* codec, SkStream* stream,
return false;
}
if (mode == SkImageDecoder::kDecodePixels_Mode) {
gGlobalImageRefPool.justAddedPixels(this);
// no need to grab the mutex here, it has already been acquired.
GetGlobalPool()->justAddedPixels(this);
}
return true;
}
@ -43,13 +60,14 @@ bool SkImageRef_GlobalPool::onDecode(SkImageDecoder* codec, SkStream* stream,
void SkImageRef_GlobalPool::onUnlockPixels() {
this->INHERITED::onUnlockPixels();
gGlobalImageRefPool.canLosePixels(this);
// by design, onUnlockPixels() already is inside the mutex-lock
GetGlobalPool()->canLosePixels(this);
}
SkImageRef_GlobalPool::SkImageRef_GlobalPool(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
this->mutex()->acquire();
gGlobalImageRefPool.addToHead(this);
GetGlobalPool()->addToHead(this);
this->mutex()->release();
}
@ -64,25 +82,25 @@ SK_DEFINE_PIXEL_REF_REGISTRAR(SkImageRef_GlobalPool)
size_t SkImageRef_GlobalPool::GetRAMBudget() {
SkAutoMutexAcquire ac(gImageRefMutex);
return gGlobalImageRefPool.getRAMBudget();
return GetGlobalPool()->getRAMBudget();
}
void SkImageRef_GlobalPool::SetRAMBudget(size_t size) {
SkAutoMutexAcquire ac(gImageRefMutex);
gGlobalImageRefPool.setRAMBudget(size);
GetGlobalPool()->setRAMBudget(size);
}
size_t SkImageRef_GlobalPool::GetRAMUsed() {
SkAutoMutexAcquire ac(gImageRefMutex);
return gGlobalImageRefPool.getRAMUsed();
return GetGlobalPool()->getRAMUsed();
}
void SkImageRef_GlobalPool::SetRAMUsed(size_t usage) {
SkAutoMutexAcquire ac(gImageRefMutex);
gGlobalImageRefPool.setRAMUsed(usage);
GetGlobalPool()->setRAMUsed(usage);
}
void SkImageRef_GlobalPool::DumpPool() {
SkAutoMutexAcquire ac(gImageRefMutex);
gGlobalImageRefPool.dump();
GetGlobalPool()->dump();
}