gecko-dev/image/Image.cpp

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13 KiB
C++

/* -*- Mode: C++; tab-width: 2; 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/. */
#include "Image.h"
#include "Layers.h" // for LayerManager
#include "nsRefreshDriver.h"
#include "nsContentUtils.h"
#include "mozilla/SizeOfState.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/Tuple.h" // for Tie
namespace mozilla {
namespace image {
///////////////////////////////////////////////////////////////////////////////
// Memory Reporting
///////////////////////////////////////////////////////////////////////////////
ImageMemoryCounter::ImageMemoryCounter(Image* aImage,
SizeOfState& aState,
bool aIsUsed)
: mIsUsed(aIsUsed)
{
MOZ_ASSERT(aImage);
// Extract metadata about the image.
RefPtr<ImageURL> imageURL(aImage->GetURI());
if (imageURL) {
imageURL->GetSpec(mURI);
}
int32_t width = 0;
int32_t height = 0;
aImage->GetWidth(&width);
aImage->GetHeight(&height);
mIntrinsicSize.SizeTo(width, height);
mType = aImage->GetType();
// Populate memory counters for source and decoded data.
mValues.SetSource(aImage->SizeOfSourceWithComputedFallback(aState));
aImage->CollectSizeOfSurfaces(mSurfaces, aState.mMallocSizeOf);
// Compute totals.
for (const SurfaceMemoryCounter& surfaceCounter : mSurfaces) {
mValues += surfaceCounter.Values();
}
}
///////////////////////////////////////////////////////////////////////////////
// Image Base Types
///////////////////////////////////////////////////////////////////////////////
void
ImageResource::SetCurrentImage(ImageContainer* aContainer,
SourceSurface* aSurface,
bool aInTransaction)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aContainer);
if (!aSurface) {
// The OS threw out some or all of our buffer. We'll need to wait for the
// redecode (which was automatically triggered by GetFrame) to complete.
return;
}
// |image| holds a reference to a SourceSurface which in turn holds a lock on
// the current frame's data buffer, ensuring that it doesn't get freed as
// long as the layer system keeps this ImageContainer alive.
RefPtr<layers::Image> image = new layers::SourceSurfaceImage(aSurface);
// We can share the producer ID with other containers because it is only
// used internally to validate the frames given to a particular container
// so that another object cannot add its own. Similarly the frame ID is
// only used internally to ensure it is always increasing, and skipping
// IDs from an individual container's perspective is acceptable.
AutoTArray<ImageContainer::NonOwningImage, 1> imageList;
imageList.AppendElement(ImageContainer::NonOwningImage(image, TimeStamp(),
mLastFrameID++,
mImageProducerID));
if (aInTransaction) {
aContainer->SetCurrentImagesInTransaction(imageList);
} else {
aContainer->SetCurrentImages(imageList);
}
}
already_AddRefed<ImageContainer>
ImageResource::GetImageContainerImpl(LayerManager* aManager,
const IntSize& aSize,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aManager);
MOZ_ASSERT((aFlags & ~(FLAG_SYNC_DECODE |
FLAG_SYNC_DECODE_IF_FAST |
FLAG_ASYNC_NOTIFY |
FLAG_HIGH_QUALITY_SCALING))
== FLAG_NONE,
"Unsupported flag passed to GetImageContainer");
IntSize size = GetImageContainerSize(aManager, aSize, aFlags);
if (size.IsEmpty()) {
return nullptr;
}
if (mAnimationConsumers == 0) {
SendOnUnlockedDraw(aFlags);
}
uint32_t flags = (aFlags & ~(FLAG_SYNC_DECODE |
FLAG_SYNC_DECODE_IF_FAST)) | FLAG_ASYNC_NOTIFY;
RefPtr<layers::ImageContainer> container;
ImageContainerEntry* entry = nullptr;
int i = mImageContainers.Length() - 1;
for (; i >= 0; --i) {
entry = &mImageContainers[i];
container = entry->mContainer.get();
if (size == entry->mSize && flags == entry->mFlags &&
aSVGContext == entry->mSVGContext) {
// Lack of a container is handled below.
break;
} else if (!container) {
// Stop tracking if our weak pointer to the image container was freed.
mImageContainers.RemoveElementAt(i);
} else {
// It isn't a match, but still valid. Forget the container so we don't
// try to reuse it below.
container = nullptr;
}
}
if (container) {
switch (entry->mLastDrawResult) {
case ImgDrawResult::SUCCESS:
case ImgDrawResult::BAD_IMAGE:
case ImgDrawResult::BAD_ARGS:
return container.forget();
case ImgDrawResult::NOT_READY:
case ImgDrawResult::INCOMPLETE:
case ImgDrawResult::TEMPORARY_ERROR:
// Temporary conditions where we need to rerequest the frame to recover.
break;
case ImgDrawResult::WRONG_SIZE:
// Unused by GetFrameInternal
default:
MOZ_ASSERT_UNREACHABLE("Unhandled ImgDrawResult type!");
return container.forget();
}
}
#ifdef DEBUG
NotifyDrawingObservers();
#endif
ImgDrawResult drawResult;
IntSize bestSize;
RefPtr<SourceSurface> surface;
Tie(drawResult, bestSize, surface) =
GetFrameInternal(size, aSVGContext, FRAME_CURRENT,
aFlags | FLAG_ASYNC_NOTIFY);
// The requested size might be refused by the surface cache (i.e. due to
// factor-of-2 mode). In that case we don't want to create an entry for this
// specific size, but rather re-use the entry for the substituted size.
if (bestSize != size) {
MOZ_ASSERT(!bestSize.IsEmpty());
// We can only remove the entry if we no longer have a container, because if
// there are strong references to it remaining, we need to still update it
// in UpdateImageContainer.
if (i >= 0 && !container) {
mImageContainers.RemoveElementAt(i);
}
// Forget about the stale container, if any. This lets the entry creation
// logic do its job below, if it turns out there is no existing best entry
// or the best entry doesn't have a container.
container = nullptr;
// We need to do the entry search again for the new size. We skip pruning
// because we did this above once already, but ImageContainer is threadsafe,
// so there is a remote possibility it got freed.
i = mImageContainers.Length() - 1;
for (; i >= 0; --i) {
entry = &mImageContainers[i];
if (bestSize == entry->mSize && flags == entry->mFlags &&
aSVGContext == entry->mSVGContext) {
container = entry->mContainer.get();
if (container) {
switch (entry->mLastDrawResult) {
case ImgDrawResult::SUCCESS:
case ImgDrawResult::BAD_IMAGE:
case ImgDrawResult::BAD_ARGS:
return container.forget();
case ImgDrawResult::NOT_READY:
case ImgDrawResult::INCOMPLETE:
case ImgDrawResult::TEMPORARY_ERROR:
// Temporary conditions where we need to rerequest the frame to
// recover. We have already done so!
break;
case ImgDrawResult::WRONG_SIZE:
// Unused by GetFrameInternal
default:
MOZ_ASSERT_UNREACHABLE("Unhandled DrawResult type!");
return container.forget();
}
}
break;
}
}
}
if (!container) {
// We need a new ImageContainer, so create one.
container = LayerManager::CreateImageContainer();
if (i >= 0) {
entry->mContainer = container;
} else {
entry = mImageContainers.AppendElement(
ImageContainerEntry(bestSize, aSVGContext, container.get(), flags));
}
}
SetCurrentImage(container, surface, true);
entry->mLastDrawResult = drawResult;
return container.forget();
}
void
ImageResource::UpdateImageContainer()
{
MOZ_ASSERT(NS_IsMainThread());
for (int i = mImageContainers.Length() - 1; i >= 0; --i) {
ImageContainerEntry& entry = mImageContainers[i];
RefPtr<ImageContainer> container = entry.mContainer.get();
if (container) {
IntSize bestSize;
RefPtr<SourceSurface> surface;
Tie(entry.mLastDrawResult, bestSize, surface) =
GetFrameInternal(entry.mSize, entry.mSVGContext,
FRAME_CURRENT, entry.mFlags);
// It is possible that this is a factor-of-2 substitution. Since we
// managed to convert the weak reference into a strong reference, that
// means that an imagelib user still is holding onto the container. thus
// we cannot consolidate and must keep updating the duplicate container.
SetCurrentImage(container, surface, false);
} else {
// Stop tracking if our weak pointer to the image container was freed.
mImageContainers.RemoveElementAt(i);
}
}
}
void
ImageResource::ReleaseImageContainer()
{
MOZ_ASSERT(NS_IsMainThread());
mImageContainers.Clear();
}
// Constructor
ImageResource::ImageResource(ImageURL* aURI) :
mURI(aURI),
mInnerWindowId(0),
mAnimationConsumers(0),
mAnimationMode(kNormalAnimMode),
mInitialized(false),
mAnimating(false),
mError(false),
mImageProducerID(ImageContainer::AllocateProducerID()),
mLastFrameID(0)
{ }
ImageResource::~ImageResource()
{
// Ask our ProgressTracker to drop its weak reference to us.
mProgressTracker->ResetImage();
}
void
ImageResource::IncrementAnimationConsumers()
{
MOZ_ASSERT(NS_IsMainThread(), "Main thread only to encourage serialization "
"with DecrementAnimationConsumers");
mAnimationConsumers++;
}
void
ImageResource::DecrementAnimationConsumers()
{
MOZ_ASSERT(NS_IsMainThread(), "Main thread only to encourage serialization "
"with IncrementAnimationConsumers");
MOZ_ASSERT(mAnimationConsumers >= 1,
"Invalid no. of animation consumers!");
mAnimationConsumers--;
}
nsresult
ImageResource::GetAnimationModeInternal(uint16_t* aAnimationMode)
{
if (mError) {
return NS_ERROR_FAILURE;
}
NS_ENSURE_ARG_POINTER(aAnimationMode);
*aAnimationMode = mAnimationMode;
return NS_OK;
}
nsresult
ImageResource::SetAnimationModeInternal(uint16_t aAnimationMode)
{
if (mError) {
return NS_ERROR_FAILURE;
}
NS_ASSERTION(aAnimationMode == kNormalAnimMode ||
aAnimationMode == kDontAnimMode ||
aAnimationMode == kLoopOnceAnimMode,
"Wrong Animation Mode is being set!");
mAnimationMode = aAnimationMode;
return NS_OK;
}
bool
ImageResource::HadRecentRefresh(const TimeStamp& aTime)
{
// Our threshold for "recent" is 1/2 of the default refresh-driver interval.
// This ensures that we allow for frame rates at least as fast as the
// refresh driver's default rate.
static TimeDuration recentThreshold =
TimeDuration::FromMilliseconds(nsRefreshDriver::DefaultInterval() / 2.0);
if (!mLastRefreshTime.IsNull() &&
aTime - mLastRefreshTime < recentThreshold) {
return true;
}
// else, we can proceed with a refresh.
// But first, update our last refresh time:
mLastRefreshTime = aTime;
return false;
}
void
ImageResource::EvaluateAnimation()
{
if (!mAnimating && ShouldAnimate()) {
nsresult rv = StartAnimation();
mAnimating = NS_SUCCEEDED(rv);
} else if (mAnimating && !ShouldAnimate()) {
StopAnimation();
}
}
void
ImageResource::SendOnUnlockedDraw(uint32_t aFlags)
{
if (!mProgressTracker) {
return;
}
if (!(aFlags & FLAG_ASYNC_NOTIFY)) {
mProgressTracker->OnUnlockedDraw();
} else {
NotNull<RefPtr<ImageResource>> image = WrapNotNull(this);
nsCOMPtr<nsIEventTarget> eventTarget = mProgressTracker->GetEventTarget();
nsCOMPtr<nsIRunnable> ev = NS_NewRunnableFunction(
"image::ImageResource::SendOnUnlockedDraw", [=]() -> void {
RefPtr<ProgressTracker> tracker = image->GetProgressTracker();
if (tracker) {
tracker->OnUnlockedDraw();
}
});
eventTarget->Dispatch(ev.forget(), NS_DISPATCH_NORMAL);
}
}
#ifdef DEBUG
void
ImageResource::NotifyDrawingObservers()
{
if (!mURI || !NS_IsMainThread()) {
return;
}
bool match = false;
if ((NS_FAILED(mURI->SchemeIs("resource", &match)) || !match) &&
(NS_FAILED(mURI->SchemeIs("chrome", &match)) || !match)) {
return;
}
// Record the image drawing for startup performance testing.
nsCOMPtr<nsIURI> uri = mURI->ToIURI();
nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
"image::ImageResource::NotifyDrawingObservers", [uri]() {
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
NS_WARNING_ASSERTION(obs, "Can't get an observer service handle");
if (obs) {
nsAutoCString spec;
uri->GetSpec(spec);
obs->NotifyObservers(nullptr, "image-drawing", NS_ConvertUTF8toUTF16(spec).get());
}
}));
}
#endif
} // namespace image
} // namespace mozilla