nsresult
DiscardTracker::Reset(Node *node)
{
// We shouldn't call Reset() with a null |img| pointer, on images which can't
// be discarded, or on animated images (which should be marked as
// non-discardable, anyway).
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sInitialized);
MOZ_ASSERT(node->img);
MOZ_ASSERT(node->img->CanDiscard());
MOZ_ASSERT(!node->img->mAnim);
// Insert the node at the front of the list and note when it was inserted.
bool wasInList = node->isInList();
if (wasInList) {
node->remove();
}
node->timestamp = TimeStamp::Now();
sDiscardableImages.insertFront(node);
// If the node wasn't already in the list of discardable images, then we may
// need to discard some images to stay under the sMaxDecodedImageKB limit.
// Call MaybeDiscardSoon to do this check.
if (!wasInList) {
MaybeDiscardSoon();
}
// Make sure the timer is running.
nsresult rv = EnableTimer();
NS_ENSURE_SUCCESS(rv,rv);
return NS_OK;
}
void
DiscardTracker::InformAllocation(PRInt64 bytes)
{
// This function is called back e.g. from RasterImage::Discard(); be careful!
sCurrentDecodedImageBytes += bytes;
MOZ_ASSERT(sCurrentDecodedImageBytes >= 0);
// If we're using too much memory for decoded images, MaybeDiscardSoon will
// enqueue a callback to discard some images.
MaybeDiscardSoon();
}
/* static */ bool
DiscardTracker::TryAllocation(uint64_t aBytes)
{
MOZ_ASSERT(sInitialized);
PR_Lock(sAllocationLock);
bool enoughSpace =
!gfxPrefs::ImageMemHardLimitDecodedImageKB() ||
(gfxPrefs::ImageMemHardLimitDecodedImageKB() * 1024) - sCurrentDecodedImageBytes >= aBytes;
if (enoughSpace) {
sCurrentDecodedImageBytes += aBytes;
}
PR_Unlock(sAllocationLock);
// If we're using too much memory for decoded images, MaybeDiscardSoon will
// enqueue a callback to discard some images.
MaybeDiscardSoon();
return enoughSpace;
}
