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#include "AutoDecodeCancel.h"
static SkMutex gAutoDecoderCancelMutex;
static AutoDecoderCancel* gAutoDecoderCancel;
#ifdef SK_DEBUG
static int gAutoDecoderCancelCount;
#endif
AutoDecoderCancel::AutoDecoderCancel(jobject joptions,
SkImageDecoder* decoder) {
fJOptions = joptions;
fDecoder = decoder;
if (NULL != joptions) {
SkAutoMutexAcquire ac(gAutoDecoderCancelMutex);
// Add us as the head of the list
fPrev = NULL;
fNext = gAutoDecoderCancel;
if (gAutoDecoderCancel) {
gAutoDecoderCancel->fPrev = this;
}
gAutoDecoderCancel = this;
SkDEBUGCODE(gAutoDecoderCancelCount += 1;)
Validate();
}
}
AutoDecoderCancel::~AutoDecoderCancel() {
if (NULL != fJOptions) {
SkAutoMutexAcquire ac(gAutoDecoderCancelMutex);
// take us out of the dllist
AutoDecoderCancel* prev = fPrev;
AutoDecoderCancel* next = fNext;
if (prev) {
SkASSERT(prev->fNext == this);
prev->fNext = next;
} else {
SkASSERT(gAutoDecoderCancel == this);
gAutoDecoderCancel = next;
}
if (next) {
SkASSERT(next->fPrev == this);
next->fPrev = prev;
}
SkDEBUGCODE(gAutoDecoderCancelCount -= 1;)
Validate();
}
}
bool AutoDecoderCancel::RequestCancel(jobject joptions) {
SkAutoMutexAcquire ac(gAutoDecoderCancelMutex);
Validate();
AutoDecoderCancel* pair = gAutoDecoderCancel;
while (pair != NULL) {
if (pair->fJOptions == joptions) {
pair->fDecoder->cancelDecode();
return true;
}
pair = pair->fNext;
}
return false;
}
#ifdef SK_DEBUG
// can only call this inside a lock on gAutoDecoderCancelMutex
void AutoDecoderCancel::Validate() {
const int gCount = gAutoDecoderCancelCount;
if (gCount == 0) {
SkASSERT(gAutoDecoderCancel == NULL);
} else {
SkASSERT(gCount > 0);
AutoDecoderCancel* curr = gAutoDecoderCancel;
SkASSERT(curr);
SkASSERT(curr->fPrev == NULL);
int count = 0;
while (curr) {
count += 1;
SkASSERT(count <= gCount);
if (curr->fPrev) {
SkASSERT(curr->fPrev->fNext == curr);
}
if (curr->fNext) {
SkASSERT(curr->fNext->fPrev == curr);
}
curr = curr->fNext;
}
SkASSERT(count == gCount);
}
}
#endif
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