Do JPEG tile-based decoding.
Change-Id: I5c1b4ac3c02eb4350ef0ba9a7877b22cfd730cfb
diff --git a/core/jni/android/graphics/AutoDecodeCancel.cpp b/core/jni/android/graphics/AutoDecodeCancel.cpp
new file mode 100644
index 0000000..f0739ea
--- /dev/null
+++ b/core/jni/android/graphics/AutoDecodeCancel.cpp
@@ -0,0 +1,100 @@
+#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