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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* table of images used in a document, for batch locking/unlocking and
* animating */
#include "ImageTracker.h"
#include "mozilla/Preferences.h"
#include "nsAppRunner.h" // for XRE_IsContentProcess
namespace mozilla {
namespace dom {
ImageTracker::ImageTracker()
: mLocking(false)
, mAnimating(true)
{
}
ImageTracker::~ImageTracker()
{
SetLockingState(false);
}
nsresult
ImageTracker::Add(imgIRequest* aImage)
{
MOZ_ASSERT(aImage);
// See if the image is already in the hashtable. If it is, get the old count.
uint32_t oldCount = 0;
mImages.Get(aImage, &oldCount);
// Put the image in the hashtable, with the proper count.
mImages.Put(aImage, oldCount + 1);
nsresult rv = NS_OK;
// If this is the first insertion and we're locking images, lock this image
// too.
if (oldCount == 0 && mLocking) {
rv = aImage->LockImage();
}
// If this is the first insertion and we're animating images, request
// that this image be animated too.
if (oldCount == 0 && mAnimating) {
nsresult rv2 = aImage->IncrementAnimationConsumers();
rv = NS_SUCCEEDED(rv) ? rv2 : rv;
}
return rv;
}
nsresult
ImageTracker::Remove(imgIRequest* aImage, uint32_t aFlags)
{
NS_ENSURE_ARG_POINTER(aImage);
// Get the old count. It should exist and be > 0.
uint32_t count = 0;
DebugOnly<bool> found = mImages.Get(aImage, &count);
MOZ_ASSERT(found, "Removing image that wasn't in the tracker!");
MOZ_ASSERT(count > 0, "Entry in the cache tracker with count 0!");
// We're removing, so decrement the count.
count--;
// If the count is now zero, remove from the tracker.
// Otherwise, set the new value.
if (count != 0) {
mImages.Put(aImage, count);
return NS_OK;
}
mImages.Remove(aImage);
nsresult rv = NS_OK;
// Now that we're no longer tracking this image, unlock it if we'd
// previously locked it.
if (mLocking) {
rv = aImage->UnlockImage();
}
// If we're animating images, remove our request to animate this one.
if (mAnimating) {
nsresult rv2 = aImage->DecrementAnimationConsumers();
rv = NS_SUCCEEDED(rv) ? rv2 : rv;
}
if (aFlags & REQUEST_DISCARD) {
// Request that the image be discarded if nobody else holds a lock on it.
// Do this even if !mLocking, because even if we didn't just unlock
// this image, it might still be a candidate for discarding.
aImage->RequestDiscard();
}
return rv;
}
nsresult
ImageTracker::SetLockingState(bool aLocked)
{
if (XRE_IsContentProcess() &&
!Preferences::GetBool("image.mem.allow_locking_in_content_processes", true)) {
return NS_OK;
}
// If there's no change, there's nothing to do.
if (mLocking == aLocked)
return NS_OK;
// Otherwise, iterate over our images and perform the appropriate action.
for (auto iter = mImages.Iter(); !iter.Done(); iter.Next()) {
imgIRequest* image = iter.Key();
if (aLocked) {
image->LockImage();
} else {
image->UnlockImage();
}
}
// Update state.
mLocking = aLocked;
return NS_OK;
}
void
ImageTracker::SetAnimatingState(bool aAnimating)
{
// If there's no change, there's nothing to do.
if (mAnimating == aAnimating)
return;
// Otherwise, iterate over our images and perform the appropriate action.
for (auto iter = mImages.Iter(); !iter.Done(); iter.Next()) {
imgIRequest* image = iter.Key();
if (aAnimating) {
image->IncrementAnimationConsumers();
} else {
image->DecrementAnimationConsumers();
}
}
// Update state.
mAnimating = aAnimating;
}
void
ImageTracker::RequestDiscardAll()
{
for (auto iter = mImages.Iter(); !iter.Done(); iter.Next()) {
iter.Key()->RequestDiscard();
}
}
} // namespace dom
} // namespace mozilla
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