gecko-dev/image/Decoder.cpp

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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 "Decoder.h"
#include "mozilla/gfx/2D.h"
#include "DecodePool.h"
#include "GeckoProfiler.h"
#include "imgIContainer.h"
#include "nsProxyRelease.h"
#include "nsServiceManagerUtils.h"
#include "nsComponentManagerUtils.h"
#include "mozilla/Telemetry.h"
using mozilla::gfx::IntSize;
using mozilla::gfx::SurfaceFormat;
namespace mozilla {
namespace image {
Decoder::Decoder(RasterImage* aImage)
: mImageData(nullptr)
, mImageDataLength(0)
, mColormap(nullptr)
, mColormapSize(0)
, mImage(aImage)
, mProgress(NoProgress)
, mFrameCount(0)
, mFailCode(NS_OK)
, mChunkCount(0)
, mDecoderFlags(DefaultDecoderFlags())
, mSurfaceFlags(DefaultSurfaceFlags())
, mBytesDecoded(0)
, mInitialized(false)
, mMetadataDecode(false)
, mInFrame(false)
, mDataDone(false)
, mDecodeDone(false)
, mDataError(false)
, mDecodeAborted(false)
, mShouldReportError(false)
{ }
Decoder::~Decoder()
{
MOZ_ASSERT(mProgress == NoProgress || !mImage,
"Destroying Decoder without taking all its progress changes");
MOZ_ASSERT(mInvalidRect.IsEmpty() || !mImage,
"Destroying Decoder without taking all its invalidations");
mInitialized = false;
if (mImage && !NS_IsMainThread()) {
// Dispatch mImage to main thread to prevent it from being destructed by the
// decode thread.
nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
NS_WARN_IF_FALSE(mainThread, "Couldn't get the main thread!");
if (mainThread) {
// Handle ambiguous nsISupports inheritance.
RasterImage* rawImg = nullptr;
mImage.swap(rawImg);
DebugOnly<nsresult> rv =
NS_ProxyRelease(mainThread, NS_ISUPPORTS_CAST(ImageResource*, rawImg));
MOZ_ASSERT(NS_SUCCEEDED(rv), "Failed to proxy release to main thread");
}
}
}
/*
* Common implementation of the decoder interface.
*/
void
Decoder::Init()
{
// No re-initializing
MOZ_ASSERT(!mInitialized, "Can't re-initialize a decoder!");
// It doesn't make sense to decode anything but the first frame if we can't
// store anything in the SurfaceCache, since only the last frame we decode
// will be retrievable.
MOZ_ASSERT(ShouldUseSurfaceCache() || IsFirstFrameDecode());
// Implementation-specific initialization
InitInternal();
mInitialized = true;
}
nsresult
Decoder::Decode(IResumable* aOnResume)
{
MOZ_ASSERT(mInitialized, "Should be initialized here");
MOZ_ASSERT(mIterator, "Should have a SourceBufferIterator");
// If no IResumable was provided, default to |this|.
IResumable* onResume = aOnResume ? aOnResume : this;
// We keep decoding chunks until the decode completes or there are no more
// chunks available.
while (!GetDecodeDone() && !HasError()) {
auto newState = mIterator->AdvanceOrScheduleResume(onResume);
if (newState == SourceBufferIterator::WAITING) {
// We can't continue because the rest of the data hasn't arrived from the
// network yet. We don't have to do anything special; the
// SourceBufferIterator will ensure that Decode() gets called again on a
// DecodePool thread when more data is available.
return NS_OK;
}
if (newState == SourceBufferIterator::COMPLETE) {
mDataDone = true;
nsresult finalStatus = mIterator->CompletionStatus();
if (NS_FAILED(finalStatus)) {
PostDataError();
}
CompleteDecode();
return finalStatus;
}
MOZ_ASSERT(newState == SourceBufferIterator::READY);
Write(mIterator->Data(), mIterator->Length());
}
CompleteDecode();
return HasError() ? NS_ERROR_FAILURE : NS_OK;
}
void
Decoder::Resume()
{
DecodePool* decodePool = DecodePool::Singleton();
MOZ_ASSERT(decodePool);
decodePool->AsyncDecode(this);
}
bool
Decoder::ShouldSyncDecode(size_t aByteLimit)
{
MOZ_ASSERT(aByteLimit > 0);
MOZ_ASSERT(mIterator, "Should have a SourceBufferIterator");
return mIterator->RemainingBytesIsNoMoreThan(aByteLimit);
}
void
Decoder::Write(const char* aBuffer, uint32_t aCount)
{
PROFILER_LABEL("ImageDecoder", "Write",
js::ProfileEntry::Category::GRAPHICS);
MOZ_ASSERT(aBuffer);
MOZ_ASSERT(aCount > 0);
// We're strict about decoder errors
MOZ_ASSERT(!HasDecoderError(),
"Not allowed to make more decoder calls after error!");
// Begin recording telemetry data.
TimeStamp start = TimeStamp::Now();
mChunkCount++;
// Keep track of the total number of bytes written.
mBytesDecoded += aCount;
// If a data error occured, just ignore future data.
if (HasDataError()) {
return;
}
if (IsMetadataDecode() && HasSize()) {
// More data came in since we found the size. We have nothing to do here.
return;
}
// Pass the data along to the implementation.
WriteInternal(aBuffer, aCount);
// Finish telemetry.
mDecodeTime += (TimeStamp::Now() - start);
}
void
Decoder::CompleteDecode()
{
// Implementation-specific finalization
if (!HasError()) {
FinishInternal();
} else {
FinishWithErrorInternal();
}
// If the implementation left us mid-frame, finish that up.
if (mInFrame && !HasError()) {
PostFrameStop();
}
// If PostDecodeDone() has not been called, and this decoder wasn't aborted
// early because of low-memory conditions or losing a race with another
// decoder, we need to send teardown notifications (and report an error to the
// console later).
if (!IsMetadataDecode() && !mDecodeDone && !WasAborted()) {
mShouldReportError = true;
// If we only have a data error, we're usable if we have at least one
// complete frame.
if (!HasDecoderError() && GetCompleteFrameCount() > 0) {
// We're usable, so do exactly what we should have when the decoder
// completed.
// Not writing to the entire frame may have left us transparent.
PostHasTransparency();
if (mInFrame) {
PostFrameStop();
}
PostDecodeDone();
} else {
// We're not usable. Record some final progress indicating the error.
if (!IsMetadataDecode()) {
mProgress |= FLAG_DECODE_COMPLETE;
}
mProgress |= FLAG_HAS_ERROR;
}
}
if (mDecodeDone && !IsMetadataDecode()) {
MOZ_ASSERT(HasError() || mCurrentFrame, "Should have an error or a frame");
// If this image wasn't animated and isn't a transient image, mark its frame
// as optimizable. We don't support optimizing animated images and
// optimizing transient images isn't worth it.
if (!HasAnimation() &&
!(mDecoderFlags & DecoderFlags::IMAGE_IS_TRANSIENT) &&
mCurrentFrame) {
mCurrentFrame->SetOptimizable();
}
}
}
nsresult
Decoder::AllocateFrame(uint32_t aFrameNum,
const nsIntSize& aTargetSize,
const nsIntRect& aFrameRect,
gfx::SurfaceFormat aFormat,
uint8_t aPaletteDepth)
{
mCurrentFrame = AllocateFrameInternal(aFrameNum, aTargetSize, aFrameRect,
aFormat, aPaletteDepth,
mCurrentFrame.get());
if (mCurrentFrame) {
// Gather the raw pointers the decoders will use.
mCurrentFrame->GetImageData(&mImageData, &mImageDataLength);
mCurrentFrame->GetPaletteData(&mColormap, &mColormapSize);
if (aFrameNum + 1 == mFrameCount) {
// If we're past the first frame, PostIsAnimated() should've been called.
MOZ_ASSERT_IF(mFrameCount > 1, HasAnimation());
// Update our state to reflect the new frame
MOZ_ASSERT(!mInFrame, "Starting new frame but not done with old one!");
mInFrame = true;
}
} else {
PostDataError();
}
return mCurrentFrame ? NS_OK : NS_ERROR_FAILURE;
}
RawAccessFrameRef
Decoder::AllocateFrameInternal(uint32_t aFrameNum,
const nsIntSize& aTargetSize,
const nsIntRect& aFrameRect,
SurfaceFormat aFormat,
uint8_t aPaletteDepth,
imgFrame* aPreviousFrame)
{
if (mDataError || NS_FAILED(mFailCode)) {
return RawAccessFrameRef();
}
if (aFrameNum != mFrameCount) {
MOZ_ASSERT_UNREACHABLE("Allocating frames out of order");
return RawAccessFrameRef();
}
if (aTargetSize.width <= 0 || aTargetSize.height <= 0 ||
aFrameRect.width <= 0 || aFrameRect.height <= 0) {
NS_WARNING("Trying to add frame with zero or negative size");
return RawAccessFrameRef();
}
const uint32_t bytesPerPixel = aPaletteDepth == 0 ? 4 : 1;
if (ShouldUseSurfaceCache() &&
!SurfaceCache::CanHold(aFrameRect.Size(), bytesPerPixel)) {
NS_WARNING("Trying to add frame that's too large for the SurfaceCache");
return RawAccessFrameRef();
}
nsRefPtr<imgFrame> frame = new imgFrame();
bool nonPremult = bool(mSurfaceFlags & SurfaceFlags::NO_PREMULTIPLY_ALPHA);
if (NS_FAILED(frame->InitForDecoder(aTargetSize, aFrameRect, aFormat,
aPaletteDepth, nonPremult))) {
NS_WARNING("imgFrame::Init should succeed");
return RawAccessFrameRef();
}
RawAccessFrameRef ref = frame->RawAccessRef();
if (!ref) {
frame->Abort();
return RawAccessFrameRef();
}
if (ShouldUseSurfaceCache()) {
InsertOutcome outcome =
SurfaceCache::Insert(frame, ImageKey(mImage.get()),
RasterSurfaceKey(aTargetSize,
mSurfaceFlags,
aFrameNum),
Lifetime::Persistent);
if (outcome == InsertOutcome::FAILURE) {
// We couldn't insert the surface, almost certainly due to low memory. We
// treat this as a permanent error to help the system recover; otherwise,
// we might just end up attempting to decode this image again immediately.
ref->Abort();
return RawAccessFrameRef();
} else if (outcome == InsertOutcome::FAILURE_ALREADY_PRESENT) {
// Another decoder beat us to decoding this frame. We abort this decoder
// rather than treat this as a real error.
mDecodeAborted = true;
ref->Abort();
return RawAccessFrameRef();
}
}
nsIntRect refreshArea;
if (aFrameNum == 1) {
MOZ_ASSERT(aPreviousFrame, "Must provide a previous frame when animated");
aPreviousFrame->SetRawAccessOnly();
// If we dispose of the first frame by clearing it, then the first frame's
// refresh area is all of itself.
// RESTORE_PREVIOUS is invalid (assumed to be DISPOSE_CLEAR).
AnimationData previousFrameData = aPreviousFrame->GetAnimationData();
if (previousFrameData.mDisposalMethod == DisposalMethod::CLEAR ||
previousFrameData.mDisposalMethod == DisposalMethod::CLEAR_ALL ||
previousFrameData.mDisposalMethod == DisposalMethod::RESTORE_PREVIOUS) {
refreshArea = previousFrameData.mRect;
}
}
if (aFrameNum > 0) {
ref->SetRawAccessOnly();
// Some GIFs are huge but only have a small area that they animate. We only
// need to refresh that small area when frame 0 comes around again.
refreshArea.UnionRect(refreshArea, frame->GetRect());
}
mFrameCount++;
if (mImage) {
mImage->OnAddedFrame(mFrameCount, refreshArea);
}
return ref;
}
/*
* Hook stubs. Override these as necessary in decoder implementations.
*/
void Decoder::InitInternal() { }
void Decoder::FinishInternal() { }
void Decoder::FinishWithErrorInternal() { }
/*
* Progress Notifications
*/
void
Decoder::PostSize(int32_t aWidth,
int32_t aHeight,
Orientation aOrientation /* = Orientation()*/)
{
// Validate
MOZ_ASSERT(aWidth >= 0, "Width can't be negative!");
MOZ_ASSERT(aHeight >= 0, "Height can't be negative!");
// Tell the image
mImageMetadata.SetSize(aWidth, aHeight, aOrientation);
// Record this notification.
mProgress |= FLAG_SIZE_AVAILABLE;
}
void
Decoder::PostHasTransparency()
{
mProgress |= FLAG_HAS_TRANSPARENCY;
}
void
Decoder::PostIsAnimated(int32_t aFirstFrameTimeout)
{
mProgress |= FLAG_IS_ANIMATED;
mImageMetadata.SetHasAnimation();
mImageMetadata.SetFirstFrameTimeout(aFirstFrameTimeout);
}
void
Decoder::PostFrameStop(Opacity aFrameOpacity /* = Opacity::TRANSPARENT */,
DisposalMethod aDisposalMethod
/* = DisposalMethod::KEEP */,
int32_t aTimeout /* = 0 */,
BlendMethod aBlendMethod /* = BlendMethod::OVER */)
{
// We should be mid-frame
MOZ_ASSERT(!IsMetadataDecode(), "Stopping frame during metadata decode");
MOZ_ASSERT(mInFrame, "Stopping frame when we didn't start one");
MOZ_ASSERT(mCurrentFrame, "Stopping frame when we don't have one");
// Update our state
mInFrame = false;
mCurrentFrame->Finish(aFrameOpacity, aDisposalMethod, aTimeout, aBlendMethod);
mProgress |= FLAG_FRAME_COMPLETE;
// If we're not sending partial invalidations, then we send an invalidation
// here when the first frame is complete.
if (!ShouldSendPartialInvalidations() && !HasAnimation()) {
mInvalidRect.UnionRect(mInvalidRect,
gfx::IntRect(gfx::IntPoint(0, 0), GetSize()));
}
}
void
Decoder::PostInvalidation(const nsIntRect& aRect,
const Maybe<nsIntRect>& aRectAtTargetSize
/* = Nothing() */)
{
// We should be mid-frame
MOZ_ASSERT(mInFrame, "Can't invalidate when not mid-frame!");
MOZ_ASSERT(mCurrentFrame, "Can't invalidate when not mid-frame!");
// Record this invalidation, unless we're not sending partial invalidations
// or we're past the first frame.
if (ShouldSendPartialInvalidations() && !HasAnimation()) {
mInvalidRect.UnionRect(mInvalidRect, aRect);
mCurrentFrame->ImageUpdated(aRectAtTargetSize.valueOr(aRect));
}
}
void
Decoder::PostDecodeDone(int32_t aLoopCount /* = 0 */)
{
MOZ_ASSERT(!IsMetadataDecode(), "Done with decoding in metadata decode");
MOZ_ASSERT(!mInFrame, "Can't be done decoding if we're mid-frame!");
MOZ_ASSERT(!mDecodeDone, "Decode already done!");
mDecodeDone = true;
mImageMetadata.SetLoopCount(aLoopCount);
mProgress |= FLAG_DECODE_COMPLETE;
}
void
Decoder::PostDataError()
{
mDataError = true;
if (mInFrame && mCurrentFrame) {
mCurrentFrame->Abort();
}
}
void
Decoder::PostDecoderError(nsresult aFailureCode)
{
MOZ_ASSERT(NS_FAILED(aFailureCode), "Not a failure code!");
mFailCode = aFailureCode;
// XXXbholley - we should report the image URI here, but imgContainer
// needs to know its URI first
NS_WARNING("Image decoding error - This is probably a bug!");
if (mInFrame && mCurrentFrame) {
mCurrentFrame->Abort();
}
}
Telemetry::ID
Decoder::SpeedHistogram()
{
// Use HistogramCount as an invalid Histogram ID.
return Telemetry::HistogramCount;
}
} // namespace image
} // namespace mozilla