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