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gecko-dev/dom/canvas/ImageBitmap.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "mozilla/dom/ImageBitmap.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/dom/HTMLMediaElementBinding.h"
#include "mozilla/dom/ImageBitmapBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/StructuredCloneTags.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Swizzle.h"
#include "mozilla/Mutex.h"
#include "mozilla/ScopeExit.h"
#include "nsNetUtil.h"
#include "nsStreamUtils.h"
#include "ImageUtils.h"
#include "imgLoader.h"
#include "imgTools.h"
using namespace mozilla::gfx;
using namespace mozilla::layers;
using mozilla::dom::HTMLMediaElement_Binding::HAVE_METADATA;
using mozilla::dom::HTMLMediaElement_Binding::NETWORK_EMPTY;
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ImageBitmap, mParent)
NS_IMPL_CYCLE_COLLECTING_ADDREF(ImageBitmap)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ImageBitmap)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageBitmap)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
/* This class observes shutdown notifications and sends that notification
* to the worker thread if the image bitmap is on a worker thread.
*/
class ImageBitmapShutdownObserver final : public nsIObserver {
public:
explicit ImageBitmapShutdownObserver(ImageBitmap* aImageBitmap)
: mImageBitmap(nullptr) {
if (NS_IsMainThread()) {
mImageBitmap = aImageBitmap;
} else {
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
mMainThreadEventTarget = workerPrivate->MainThreadEventTarget();
mSendToWorkerTask = new SendShutdownToWorkerThread(aImageBitmap);
}
}
void RegisterObserver() {
if (NS_IsMainThread()) {
nsContentUtils::RegisterShutdownObserver(this);
return;
}
MOZ_ASSERT(mMainThreadEventTarget);
RefPtr<ImageBitmapShutdownObserver> self = this;
nsCOMPtr<nsIRunnable> r =
NS_NewRunnableFunction("ImageBitmapShutdownObserver::RegisterObserver",
[self]() { self->RegisterObserver(); });
mMainThreadEventTarget->Dispatch(r.forget());
}
void UnregisterObserver() {
if (NS_IsMainThread()) {
nsContentUtils::UnregisterShutdownObserver(this);
return;
}
MOZ_ASSERT(mMainThreadEventTarget);
RefPtr<ImageBitmapShutdownObserver> self = this;
nsCOMPtr<nsIRunnable> r =
NS_NewRunnableFunction("ImageBitmapShutdownObserver::RegisterObserver",
[self]() { self->UnregisterObserver(); });
mMainThreadEventTarget->Dispatch(r.forget());
}
void Clear() {
mImageBitmap = nullptr;
if (mSendToWorkerTask) {
mSendToWorkerTask->mImageBitmap = nullptr;
}
}
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIOBSERVER
private:
~ImageBitmapShutdownObserver() = default;
class SendShutdownToWorkerThread : public MainThreadWorkerControlRunnable {
public:
explicit SendShutdownToWorkerThread(ImageBitmap* aImageBitmap)
: MainThreadWorkerControlRunnable(GetCurrentThreadWorkerPrivate()),
mImageBitmap(aImageBitmap) {}
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
if (mImageBitmap) {
mImageBitmap->OnShutdown();
mImageBitmap = nullptr;
}
return true;
}
ImageBitmap* mImageBitmap;
};
ImageBitmap* mImageBitmap;
nsCOMPtr<nsIEventTarget> mMainThreadEventTarget;
RefPtr<SendShutdownToWorkerThread> mSendToWorkerTask;
};
NS_IMPL_ISUPPORTS(ImageBitmapShutdownObserver, nsIObserver)
NS_IMETHODIMP
ImageBitmapShutdownObserver::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
if (mSendToWorkerTask) {
mSendToWorkerTask->Dispatch();
} else {
if (mImageBitmap) {
mImageBitmap->OnShutdown();
mImageBitmap = nullptr;
}
}
nsContentUtils::UnregisterShutdownObserver(this);
}
return NS_OK;
}
/*
* If either aRect.width or aRect.height are negative, then return a new IntRect
* which represents the same rectangle as the aRect does but with positive width
* and height.
*/
static IntRect FixUpNegativeDimension(const IntRect& aRect, ErrorResult& aRv) {
gfx::IntRect rect = aRect;
// fix up negative dimensions
if (rect.width < 0) {
CheckedInt32 checkedX = CheckedInt32(rect.x) + rect.width;
if (!checkedX.isValid()) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return rect;
}
rect.x = checkedX.value();
rect.width = -(rect.width);
}
if (rect.height < 0) {
CheckedInt32 checkedY = CheckedInt32(rect.y) + rect.height;
if (!checkedY.isValid()) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return rect;
}
rect.y = checkedY.value();
rect.height = -(rect.height);
}
return rect;
}
/*
* This helper function copies the data of the given DataSourceSurface,
* _aSurface_, in the given area, _aCropRect_, into a new DataSourceSurface.
* This might return null if it can not create a new SourceSurface or it cannot
* read data from the given _aSurface_.
*
* Warning: Even though the area of _aCropRect_ is just the same as the size of
* _aSurface_, this function still copy data into a new
* DataSourceSurface.
*/
static already_AddRefed<DataSourceSurface> CropAndCopyDataSourceSurface(
DataSourceSurface* aSurface, const IntRect& aCropRect) {
MOZ_ASSERT(aSurface);
// Check the aCropRect
ErrorResult error;
const IntRect positiveCropRect = FixUpNegativeDimension(aCropRect, error);
if (NS_WARN_IF(error.Failed())) {
error.SuppressException();
return nullptr;
}
// Calculate the size of the new SourceSurface.
// We cannot keep using aSurface->GetFormat() to create new DataSourceSurface,
// since it might be SurfaceFormat::B8G8R8X8 which does not handle opacity,
// however the specification explicitly define that "If any of the pixels on
// this rectangle are outside the area where the input bitmap was placed, then
// they will be transparent black in output."
// So, instead, we force the output format to be SurfaceFormat::B8G8R8A8.
const SurfaceFormat format = SurfaceFormat::B8G8R8A8;
const int bytesPerPixel = BytesPerPixel(format);
const IntSize dstSize =
IntSize(positiveCropRect.width, positiveCropRect.height);
const uint32_t dstStride = dstSize.width * bytesPerPixel;
// Create a new SourceSurface.
RefPtr<DataSourceSurface> dstDataSurface =
Factory::CreateDataSourceSurfaceWithStride(dstSize, format, dstStride,
true);
if (NS_WARN_IF(!dstDataSurface)) {
return nullptr;
}
// Only do copying and cropping when the positiveCropRect intersects with
// the size of aSurface.
const IntRect surfRect(IntPoint(0, 0), aSurface->GetSize());
if (surfRect.Intersects(positiveCropRect)) {
const IntRect surfPortion = surfRect.Intersect(positiveCropRect);
const IntPoint dest(std::max(0, surfPortion.X() - positiveCropRect.X()),
std::max(0, surfPortion.Y() - positiveCropRect.Y()));
// Copy the raw data into the newly created DataSourceSurface.
DataSourceSurface::ScopedMap srcMap(aSurface, DataSourceSurface::READ);
DataSourceSurface::ScopedMap dstMap(dstDataSurface,
DataSourceSurface::WRITE);
if (NS_WARN_IF(!srcMap.IsMapped()) || NS_WARN_IF(!dstMap.IsMapped())) {
return nullptr;
}
uint8_t* srcBufferPtr = srcMap.GetData() +
surfPortion.y * srcMap.GetStride() +
surfPortion.x * bytesPerPixel;
uint8_t* dstBufferPtr =
dstMap.GetData() + dest.y * dstMap.GetStride() + dest.x * bytesPerPixel;
CheckedInt<uint32_t> copiedBytesPerRaw =
CheckedInt<uint32_t>(surfPortion.width) * bytesPerPixel;
if (!copiedBytesPerRaw.isValid()) {
return nullptr;
}
for (int i = 0; i < surfPortion.height; ++i) {
memcpy(dstBufferPtr, srcBufferPtr, copiedBytesPerRaw.value());
srcBufferPtr += srcMap.GetStride();
dstBufferPtr += dstMap.GetStride();
}
}
return dstDataSurface.forget();
}
/*
* Encapsulate the given _aSurface_ into a layers::SourceSurfaceImage.
*/
static already_AddRefed<layers::Image> CreateImageFromSurface(
SourceSurface* aSurface) {
MOZ_ASSERT(aSurface);
RefPtr<layers::SourceSurfaceImage> image =
new layers::SourceSurfaceImage(aSurface->GetSize(), aSurface);
return image.forget();
}
/*
* CreateImageFromRawData(), CreateSurfaceFromRawData() and
* CreateImageFromRawDataInMainThreadSyncTask are helpers for
* create-from-ImageData case
*/
static already_AddRefed<SourceSurface> CreateSurfaceFromRawData(
const gfx::IntSize& aSize, uint32_t aStride, gfx::SurfaceFormat aFormat,
uint8_t* aBuffer, uint32_t aBufferLength, const Maybe<IntRect>& aCropRect) {
MOZ_ASSERT(!aSize.IsEmpty());
MOZ_ASSERT(aBuffer);
// Wrap the source buffer into a SourceSurface.
RefPtr<DataSourceSurface> dataSurface =
Factory::CreateWrappingDataSourceSurface(aBuffer, aStride, aSize,
aFormat);
if (NS_WARN_IF(!dataSurface)) {
return nullptr;
}
// The temporary cropRect variable is equal to the size of source buffer if we
// do not need to crop, or it equals to the given cropping size.
const IntRect cropRect =
aCropRect.valueOr(IntRect(0, 0, aSize.width, aSize.height));
// Copy the source buffer in the _cropRect_ area into a new SourceSurface.
RefPtr<DataSourceSurface> result =
CropAndCopyDataSourceSurface(dataSurface, cropRect);
if (NS_WARN_IF(!result)) {
return nullptr;
}
return result.forget();
}
static already_AddRefed<layers::Image> CreateImageFromRawData(
const gfx::IntSize& aSize, uint32_t aStride, gfx::SurfaceFormat aFormat,
uint8_t* aBuffer, uint32_t aBufferLength, const Maybe<IntRect>& aCropRect) {
MOZ_ASSERT(NS_IsMainThread());
// Copy and crop the source buffer into a SourceSurface.
RefPtr<SourceSurface> rgbaSurface = CreateSurfaceFromRawData(
aSize, aStride, aFormat, aBuffer, aBufferLength, aCropRect);
if (NS_WARN_IF(!rgbaSurface)) {
return nullptr;
}
// Convert RGBA to BGRA
RefPtr<DataSourceSurface> rgbaDataSurface = rgbaSurface->GetDataSurface();
DataSourceSurface::ScopedMap rgbaMap(rgbaDataSurface,
DataSourceSurface::READ);
if (NS_WARN_IF(!rgbaMap.IsMapped())) {
return nullptr;
}
RefPtr<DataSourceSurface> bgraDataSurface =
Factory::CreateDataSourceSurfaceWithStride(rgbaDataSurface->GetSize(),
SurfaceFormat::B8G8R8A8,
rgbaMap.GetStride());
if (NS_WARN_IF(!bgraDataSurface)) {
return nullptr;
}
DataSourceSurface::ScopedMap bgraMap(bgraDataSurface,
DataSourceSurface::WRITE);
if (NS_WARN_IF(!bgraMap.IsMapped())) {
return nullptr;
}
SwizzleData(rgbaMap.GetData(), rgbaMap.GetStride(), SurfaceFormat::R8G8B8A8,
bgraMap.GetData(), bgraMap.GetStride(), SurfaceFormat::B8G8R8A8,
bgraDataSurface->GetSize());
// Create an Image from the BGRA SourceSurface.
RefPtr<layers::Image> image = CreateImageFromSurface(bgraDataSurface);
if (NS_WARN_IF(!image)) {
return nullptr;
}
return image.forget();
}
/*
* This is a synchronous task.
* This class is used to create a layers::SourceSurfaceImage from raw data in
* the main thread. While creating an ImageBitmap from an ImageData, we need to
* create a SouceSurface from the ImageData's raw data and then set the
* SourceSurface into a layers::SourceSurfaceImage. However, the
* layers::SourceSurfaceImage asserts the setting operation in the main thread,
* so if we are going to create an ImageBitmap from an ImageData off the main
* thread, we post an event to the main thread to create a
* layers::SourceSurfaceImage from an ImageData's raw data.
*/
class CreateImageFromRawDataInMainThreadSyncTask final
: public WorkerMainThreadRunnable {
public:
CreateImageFromRawDataInMainThreadSyncTask(
uint8_t* aBuffer, uint32_t aBufferLength, uint32_t aStride,
gfx::SurfaceFormat aFormat, const gfx::IntSize& aSize,
const Maybe<IntRect>& aCropRect, layers::Image** aImage)
: WorkerMainThreadRunnable(
GetCurrentThreadWorkerPrivate(),
NS_LITERAL_CSTRING("ImageBitmap :: Create Image from Raw Data")),
mImage(aImage),
mBuffer(aBuffer),
mBufferLength(aBufferLength),
mStride(aStride),
mFormat(aFormat),
mSize(aSize),
mCropRect(aCropRect) {
MOZ_ASSERT(!(*aImage),
"Don't pass an existing Image into "
"CreateImageFromRawDataInMainThreadSyncTask.");
}
bool MainThreadRun() override {
RefPtr<layers::Image> image = CreateImageFromRawData(
mSize, mStride, mFormat, mBuffer, mBufferLength, mCropRect);
if (NS_WARN_IF(!image)) {
return false;
}
image.forget(mImage);
return true;
}
private:
layers::Image** mImage;
uint8_t* mBuffer;
uint32_t mBufferLength;
uint32_t mStride;
gfx::SurfaceFormat mFormat;
gfx::IntSize mSize;
const Maybe<IntRect>& mCropRect;
};
/*
* A wrapper to the nsLayoutUtils::SurfaceFromElement() function followed by the
* security checking.
*/
template <class ElementType>
static already_AddRefed<SourceSurface> GetSurfaceFromElement(
nsIGlobalObject* aGlobal, ElementType& aElement, bool* aWriteOnly,
ErrorResult& aRv) {
nsLayoutUtils::SurfaceFromElementResult res =
nsLayoutUtils::SurfaceFromElement(
&aElement, nsLayoutUtils::SFE_WANT_FIRST_FRAME_IF_IMAGE);
RefPtr<SourceSurface> surface = res.GetSourceSurface();
if (NS_WARN_IF(!surface)) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
*aWriteOnly = res.mIsWriteOnly;
return surface.forget();
}
ImageBitmap::ImageBitmap(nsIGlobalObject* aGlobal, layers::Image* aData,
bool aWriteOnly, gfxAlphaType aAlphaType)
: mParent(aGlobal),
mData(aData),
mSurface(nullptr),
mDataWrapper(new ImageUtils(mData)),
mPictureRect(0, 0, aData->GetSize().width, aData->GetSize().height),
mAlphaType(aAlphaType),
mAllocatedImageData(false),
mWriteOnly(aWriteOnly) {
MOZ_ASSERT(aData, "aData is null in ImageBitmap constructor.");
mShutdownObserver = new ImageBitmapShutdownObserver(this);
mShutdownObserver->RegisterObserver();
}
ImageBitmap::~ImageBitmap() {
if (mShutdownObserver) {
mShutdownObserver->Clear();
mShutdownObserver->UnregisterObserver();
mShutdownObserver = nullptr;
}
}
JSObject* ImageBitmap::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return ImageBitmap_Binding::Wrap(aCx, this, aGivenProto);
}
void ImageBitmap::Close() {
mData = nullptr;
mSurface = nullptr;
mDataWrapper = nullptr;
mPictureRect.SetEmpty();
}
void ImageBitmap::OnShutdown() {
mShutdownObserver = nullptr;
Close();
}
void ImageBitmap::SetPictureRect(const IntRect& aRect, ErrorResult& aRv) {
mPictureRect = FixUpNegativeDimension(aRect, aRv);
}
/*
* The functionality of PrepareForDrawTarget method:
* (1) Get a SourceSurface from the mData (which is a layers::Image).
* (2) Convert the SourceSurface to format B8G8R8A8 if the original format is
* R8G8B8, B8G8R8, HSV or Lab.
* Note: if the original format is A8 or Depth, then return null directly.
* (3) Do cropping if the size of SourceSurface does not equal to the
* mPictureRect.
* (4) Pre-multiply alpha if needed.
*/
already_AddRefed<SourceSurface> ImageBitmap::PrepareForDrawTarget(
gfx::DrawTarget* aTarget) {
MOZ_ASSERT(aTarget);
if (!mData) {
return nullptr;
}
if (!mSurface) {
mSurface = mData->GetAsSourceSurface();
if (!mSurface) {
return nullptr;
}
}
RefPtr<DrawTarget> target = aTarget;
IntRect surfRect(0, 0, mSurface->GetSize().width, mSurface->GetSize().height);
// Check if we still need to crop our surface
if (!mPictureRect.IsEqualEdges(surfRect)) {
IntRect surfPortion = surfRect.Intersect(mPictureRect);
// the crop lies entirely outside the surface area, nothing to draw
if (surfPortion.IsEmpty()) {
mSurface = nullptr;
RefPtr<gfx::SourceSurface> surface(mSurface);
return surface.forget();
}
IntPoint dest(std::max(0, surfPortion.X() - mPictureRect.X()),
std::max(0, surfPortion.Y() - mPictureRect.Y()));
// We must initialize this target with mPictureRect.Size() because the
// specification states that if the cropping area is given, then return an
// ImageBitmap with the size equals to the cropping area.
target = target->CreateSimilarDrawTarget(mPictureRect.Size(),
target->GetFormat());
if (!target) {
mSurface = nullptr;
RefPtr<gfx::SourceSurface> surface(mSurface);
return surface.forget();
}
target->CopySurface(mSurface, surfPortion, dest);
mSurface = target->Snapshot();
// Make mCropRect match new surface we've cropped to
mPictureRect.MoveTo(0, 0);
}
// Pre-multiply alpha here.
// Ignore this step if the source surface does not have alpha channel; this
// kind of source surfaces might come form layers::PlanarYCbCrImage.
if (mAlphaType == gfxAlphaType::NonPremult &&
!IsOpaque(mSurface->GetFormat())) {
MOZ_ASSERT(mSurface->GetFormat() == SurfaceFormat::R8G8B8A8 ||
mSurface->GetFormat() == SurfaceFormat::B8G8R8A8 ||
mSurface->GetFormat() == SurfaceFormat::A8R8G8B8);
RefPtr<DataSourceSurface> dstSurface = mSurface->GetDataSurface();
MOZ_ASSERT(dstSurface);
RefPtr<DataSourceSurface> srcSurface;
DataSourceSurface::MappedSurface srcMap;
DataSourceSurface::MappedSurface dstMap;
if (dstSurface->Map(DataSourceSurface::MapType::READ_WRITE, &dstMap)) {
srcMap = dstMap;
} else {
srcSurface = dstSurface;
if (!srcSurface->Map(DataSourceSurface::READ, &srcMap)) {
gfxCriticalError()
<< "Failed to map source surface for premultiplying alpha.";
return nullptr;
}
dstSurface = Factory::CreateDataSourceSurface(srcSurface->GetSize(),
srcSurface->GetFormat());
if (!dstSurface ||
!dstSurface->Map(DataSourceSurface::MapType::WRITE, &dstMap)) {
gfxCriticalError()
<< "Failed to map destination surface for premultiplying alpha.";
srcSurface->Unmap();
return nullptr;
}
}
PremultiplyData(srcMap.mData, srcMap.mStride, mSurface->GetFormat(),
dstMap.mData, dstMap.mStride, mSurface->GetFormat(),
dstSurface->GetSize());
dstSurface->Unmap();
if (srcSurface) {
srcSurface->Unmap();
}
mSurface = dstSurface;
}
// Replace our surface with one optimized for the target we're about to draw
// to, under the assumption it'll likely be drawn again to that target.
// This call should be a no-op for already-optimized surfaces
mSurface = target->OptimizeSourceSurface(mSurface);
RefPtr<gfx::SourceSurface> surface(mSurface);
return surface.forget();
}
already_AddRefed<layers::Image> ImageBitmap::TransferAsImage() {
RefPtr<layers::Image> image = mData;
Close();
return image.forget();
}
UniquePtr<ImageBitmapCloneData> ImageBitmap::ToCloneData() const {
if (!mData) {
// A closed image cannot be cloned.
return nullptr;
}
UniquePtr<ImageBitmapCloneData> result(new ImageBitmapCloneData());
result->mPictureRect = mPictureRect;
result->mAlphaType = mAlphaType;
RefPtr<SourceSurface> surface = mData->GetAsSourceSurface();
if (!surface) {
// It might just not be possible to get/map the surface. (e.g. from another
// process)
return nullptr;
}
result->mSurface = surface->GetDataSurface();
MOZ_ASSERT(result->mSurface);
result->mWriteOnly = mWriteOnly;
return result;
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateFromSourceSurface(
nsIGlobalObject* aGlobal, gfx::SourceSurface* aSource, ErrorResult& aRv) {
RefPtr<layers::Image> data = CreateImageFromSurface(aSource);
RefPtr<ImageBitmap> ret =
new ImageBitmap(aGlobal, data, false /* writeOnly */);
ret->mAllocatedImageData = true;
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateFromCloneData(
nsIGlobalObject* aGlobal, ImageBitmapCloneData* aData) {
RefPtr<layers::Image> data = CreateImageFromSurface(aData->mSurface);
RefPtr<ImageBitmap> ret =
new ImageBitmap(aGlobal, data, aData->mWriteOnly, aData->mAlphaType);
ret->mAllocatedImageData = true;
ErrorResult rv;
ret->SetPictureRect(aData->mPictureRect, rv);
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateFromOffscreenCanvas(
nsIGlobalObject* aGlobal, OffscreenCanvas& aOffscreenCanvas,
ErrorResult& aRv) {
// Check write-only mode.
bool writeOnly = aOffscreenCanvas.IsWriteOnly();
nsLayoutUtils::SurfaceFromElementResult res =
nsLayoutUtils::SurfaceFromOffscreenCanvas(
&aOffscreenCanvas, nsLayoutUtils::SFE_WANT_FIRST_FRAME_IF_IMAGE);
RefPtr<SourceSurface> surface = res.GetSourceSurface();
if (NS_WARN_IF(!surface)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
RefPtr<layers::Image> data = CreateImageFromSurface(surface);
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
ret->mAllocatedImageData = true;
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateInternal(
nsIGlobalObject* aGlobal, HTMLImageElement& aImageEl,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv) {
// Check if the image element is completely available or not.
if (!aImageEl.Complete()) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
bool writeOnly = true;
// Get the SourceSurface out from the image element and then do security
// checking.
RefPtr<SourceSurface> surface =
GetSurfaceFromElement(aGlobal, aImageEl, &writeOnly, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
// Create ImageBitmap.
RefPtr<layers::Image> data = CreateImageFromSurface(surface);
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateInternal(
nsIGlobalObject* aGlobal, SVGImageElement& aImageEl,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv) {
bool writeOnly = true;
// Get the SourceSurface out from the image element and then do security
// checking.
RefPtr<SourceSurface> surface =
GetSurfaceFromElement(aGlobal, aImageEl, &writeOnly, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
// Create ImageBitmap.
RefPtr<layers::Image> data = CreateImageFromSurface(surface);
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateInternal(
nsIGlobalObject* aGlobal, HTMLVideoElement& aVideoEl,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv) {
aVideoEl.MarkAsContentSource(
mozilla::dom::HTMLVideoElement::CallerAPI::CREATE_IMAGEBITMAP);
// Check network state.
if (aVideoEl.NetworkState() == NETWORK_EMPTY) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Check ready state.
// Cannot be HTMLMediaElement::HAVE_NOTHING or
// HTMLMediaElement::HAVE_METADATA.
if (aVideoEl.ReadyState() <= HAVE_METADATA) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Check security.
nsCOMPtr<nsIPrincipal> principal = aVideoEl.GetCurrentVideoPrincipal();
bool hadCrossOriginRedirects = aVideoEl.HadCrossOriginRedirects();
bool CORSUsed = aVideoEl.GetCORSMode() != CORS_NONE;
bool writeOnly =
CheckWriteOnlySecurity(CORSUsed, principal, hadCrossOriginRedirects);
// Create ImageBitmap.
RefPtr<layers::Image> data = aVideoEl.GetCurrentImage();
if (!data) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateInternal(
nsIGlobalObject* aGlobal, HTMLCanvasElement& aCanvasEl,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv) {
if (aCanvasEl.Width() == 0 || aCanvasEl.Height() == 0) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
bool writeOnly = true;
RefPtr<SourceSurface> surface =
GetSurfaceFromElement(aGlobal, aCanvasEl, &writeOnly, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
if (!writeOnly) {
writeOnly = aCanvasEl.IsWriteOnly();
}
// Crop the source surface if needed.
RefPtr<SourceSurface> croppedSurface;
IntRect cropRect = aCropRect.valueOr(IntRect());
// If the HTMLCanvasElement's rendering context is WebGL/WebGPU,
// then the snapshot we got from the HTMLCanvasElement is
// a DataSourceSurface which is a copy of the rendering context.
// We handle cropping in this case.
bool needToReportMemoryAllocation = false;
if ((aCanvasEl.GetCurrentContextType() == CanvasContextType::WebGL1 ||
aCanvasEl.GetCurrentContextType() == CanvasContextType::WebGL2 ||
aCanvasEl.GetCurrentContextType() == CanvasContextType::WebGPU) &&
aCropRect.isSome()) {
RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
croppedSurface = CropAndCopyDataSourceSurface(dataSurface, cropRect);
cropRect.MoveTo(0, 0);
needToReportMemoryAllocation = true;
} else {
croppedSurface = surface;
}
if (NS_WARN_IF(!croppedSurface)) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Create an Image from the SourceSurface.
RefPtr<layers::Image> data = CreateImageFromSurface(croppedSurface);
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
if (needToReportMemoryAllocation) {
ret->mAllocatedImageData = true;
}
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(cropRect, aRv);
}
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateInternal(
nsIGlobalObject* aGlobal, ImageData& aImageData,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv) {
// Copy data into SourceSurface.
dom::Uint8ClampedArray array;
DebugOnly<bool> inited = array.Init(aImageData.GetDataObject());
MOZ_ASSERT(inited);
array.ComputeState();
const SurfaceFormat FORMAT = SurfaceFormat::R8G8B8A8;
// ImageData's underlying data is not alpha-premultiplied.
const auto alphaType = gfxAlphaType::NonPremult;
const uint32_t BYTES_PER_PIXEL = BytesPerPixel(FORMAT);
const uint32_t imageWidth = aImageData.Width();
const uint32_t imageHeight = aImageData.Height();
const uint32_t imageStride = imageWidth * BYTES_PER_PIXEL;
const uint32_t dataLength = array.Length();
const gfx::IntSize imageSize(imageWidth, imageHeight);
// Check the ImageData is neutered or not.
if (imageWidth == 0 || imageHeight == 0 ||
(imageWidth * imageHeight * BYTES_PER_PIXEL) != dataLength) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Create and Crop the raw data into a layers::Image
RefPtr<layers::Image> data;
if (NS_IsMainThread()) {
data = CreateImageFromRawData(imageSize, imageStride, FORMAT, array.Data(),
dataLength, aCropRect);
} else {
RefPtr<CreateImageFromRawDataInMainThreadSyncTask> task =
new CreateImageFromRawDataInMainThreadSyncTask(
array.Data(), dataLength, imageStride, FORMAT, imageSize, aCropRect,
getter_AddRefs(data));
task->Dispatch(Canceling, aRv);
}
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Create an ImageBimtap.
RefPtr<ImageBitmap> ret =
new ImageBitmap(aGlobal, data, false /* write-only */, alphaType);
ret->mAllocatedImageData = true;
// The cropping information has been handled in the CreateImageFromRawData()
// function.
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateInternal(
nsIGlobalObject* aGlobal, CanvasRenderingContext2D& aCanvasCtx,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv) {
nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(aGlobal);
nsGlobalWindowInner* window = nsGlobalWindowInner::Cast(win);
if (NS_WARN_IF(!window) || !window->GetExtantDoc()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
window->GetExtantDoc()->WarnOnceAbout(
Document::eCreateImageBitmapCanvasRenderingContext2D);
// Check write-only mode.
bool writeOnly =
aCanvasCtx.GetCanvas()->IsWriteOnly() || aCanvasCtx.IsWriteOnly();
RefPtr<SourceSurface> surface = aCanvasCtx.GetSurfaceSnapshot();
if (NS_WARN_IF(!surface)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
const IntSize surfaceSize = surface->GetSize();
if (surfaceSize.width == 0 || surfaceSize.height == 0) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
RefPtr<layers::Image> data = CreateImageFromSurface(surface);
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, writeOnly);
ret->mAllocatedImageData = true;
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
return ret.forget();
}
/* static */
already_AddRefed<ImageBitmap> ImageBitmap::CreateInternal(
nsIGlobalObject* aGlobal, ImageBitmap& aImageBitmap,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv) {
if (!aImageBitmap.mData) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
RefPtr<layers::Image> data = aImageBitmap.mData;
RefPtr<ImageBitmap> ret = new ImageBitmap(
aGlobal, data, aImageBitmap.mWriteOnly, aImageBitmap.mAlphaType);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
return ret.forget();
}
class FulfillImageBitmapPromise {
protected:
FulfillImageBitmapPromise(Promise* aPromise, ImageBitmap* aImageBitmap)
: mPromise(aPromise), mImageBitmap(aImageBitmap) {
MOZ_ASSERT(aPromise);
}
void DoFulfillImageBitmapPromise() { mPromise->MaybeResolve(mImageBitmap); }
private:
RefPtr<Promise> mPromise;
RefPtr<ImageBitmap> mImageBitmap;
};
class FulfillImageBitmapPromiseTask final : public Runnable,
public FulfillImageBitmapPromise {
public:
FulfillImageBitmapPromiseTask(Promise* aPromise, ImageBitmap* aImageBitmap)
: Runnable("dom::FulfillImageBitmapPromiseTask"),
FulfillImageBitmapPromise(aPromise, aImageBitmap) {}
NS_IMETHOD Run() override {
DoFulfillImageBitmapPromise();
return NS_OK;
}
};
class FulfillImageBitmapPromiseWorkerTask final
: public WorkerSameThreadRunnable,
public FulfillImageBitmapPromise {
public:
FulfillImageBitmapPromiseWorkerTask(Promise* aPromise,
ImageBitmap* aImageBitmap)
: WorkerSameThreadRunnable(GetCurrentThreadWorkerPrivate()),
FulfillImageBitmapPromise(aPromise, aImageBitmap) {}
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
DoFulfillImageBitmapPromise();
return true;
}
};
static void AsyncFulfillImageBitmapPromise(Promise* aPromise,
ImageBitmap* aImageBitmap) {
if (NS_IsMainThread()) {
nsCOMPtr<nsIRunnable> task =
new FulfillImageBitmapPromiseTask(aPromise, aImageBitmap);
NS_DispatchToCurrentThread(task); // Actually, to the main-thread.
} else {
RefPtr<FulfillImageBitmapPromiseWorkerTask> task =
new FulfillImageBitmapPromiseWorkerTask(aPromise, aImageBitmap);
task->Dispatch(); // Actually, to the current worker-thread.
}
}
class CreateImageBitmapFromBlobRunnable;
class CreateImageBitmapFromBlob final : public CancelableRunnable,
public imgIContainerCallback,
public nsIInputStreamCallback {
friend class CreateImageBitmapFromBlobRunnable;
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_IMGICONTAINERCALLBACK
NS_DECL_NSIINPUTSTREAMCALLBACK
static already_AddRefed<CreateImageBitmapFromBlob> Create(
Promise* aPromise, nsIGlobalObject* aGlobal, Blob& aBlob,
const Maybe<IntRect>& aCropRect, nsIEventTarget* aMainThreadEventTarget);
NS_IMETHOD Run() override {
MOZ_ASSERT(IsCurrentThread());
nsresult rv = StartMimeTypeAndDecodeAndCropBlob();
if (NS_WARN_IF(NS_FAILED(rv))) {
MimeTypeAndDecodeAndCropBlobCompletedMainThread(nullptr, rv);
}
return NS_OK;
}
// Called by the WorkerRef.
void WorkerShuttingDown();
private:
CreateImageBitmapFromBlob(Promise* aPromise, nsIGlobalObject* aGlobal,
already_AddRefed<nsIInputStream> aInputStream,
const Maybe<IntRect>& aCropRect,
nsIEventTarget* aMainThreadEventTarget)
: CancelableRunnable("dom::CreateImageBitmapFromBlob"),
mMutex("dom::CreateImageBitmapFromBlob::mMutex"),
mPromise(aPromise),
mGlobalObject(aGlobal),
mInputStream(std::move(aInputStream)),
mCropRect(aCropRect),
mOriginalCropRect(aCropRect),
mMainThreadEventTarget(aMainThreadEventTarget),
mThread(PR_GetCurrentThread()) {}
virtual ~CreateImageBitmapFromBlob() = default;
bool IsCurrentThread() const { return mThread == PR_GetCurrentThread(); }
// Called on the owning thread.
nsresult StartMimeTypeAndDecodeAndCropBlob();
// Will be called when the decoding + cropping is completed on the
// main-thread. This could the not the owning thread!
void MimeTypeAndDecodeAndCropBlobCompletedMainThread(layers::Image* aImage,
nsresult aStatus);
// Will be called when the decoding + cropping is completed on the owning
// thread.
void MimeTypeAndDecodeAndCropBlobCompletedOwningThread(layers::Image* aImage,
nsresult aStatus);
// This is called on the main-thread only.
nsresult MimeTypeAndDecodeAndCropBlob();
// This is called on the main-thread only.
nsresult DecodeAndCropBlob(const nsACString& aMimeType);
// This is called on the main-thread only.
nsresult GetMimeTypeSync(nsACString& aMimeType);
// This is called on the main-thread only.
nsresult GetMimeTypeAsync();
Mutex mMutex;
// The access to this object is protected by mutex but is always nullified on
// the owning thread.
RefPtr<ThreadSafeWorkerRef> mWorkerRef;
// Touched only on the owning thread.
RefPtr<Promise> mPromise;
// Touched only on the owning thread.
nsCOMPtr<nsIGlobalObject> mGlobalObject;
nsCOMPtr<nsIInputStream> mInputStream;
Maybe<IntRect> mCropRect;
Maybe<IntRect> mOriginalCropRect;
IntSize mSourceSize;
nsCOMPtr<nsIEventTarget> mMainThreadEventTarget;
void* mThread;
};
NS_IMPL_ISUPPORTS_INHERITED(CreateImageBitmapFromBlob, CancelableRunnable,
imgIContainerCallback, nsIInputStreamCallback)
class CreateImageBitmapFromBlobRunnable : public WorkerRunnable {
public:
explicit CreateImageBitmapFromBlobRunnable(WorkerPrivate* aWorkerPrivate,
CreateImageBitmapFromBlob* aTask,
layers::Image* aImage,
nsresult aStatus)
: WorkerRunnable(aWorkerPrivate),
mTask(aTask),
mImage(aImage),
mStatus(aStatus) {}
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
mTask->MimeTypeAndDecodeAndCropBlobCompletedOwningThread(mImage, mStatus);
return true;
}
private:
RefPtr<CreateImageBitmapFromBlob> mTask;
RefPtr<layers::Image> mImage;
nsresult mStatus;
};
static void AsyncCreateImageBitmapFromBlob(Promise* aPromise,
nsIGlobalObject* aGlobal,
Blob& aBlob,
const Maybe<IntRect>& aCropRect) {
// Let's identify the main-thread event target.
nsCOMPtr<nsIEventTarget> mainThreadEventTarget;
if (NS_IsMainThread()) {
mainThreadEventTarget = aGlobal->EventTargetFor(TaskCategory::Other);
} else {
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
mainThreadEventTarget = workerPrivate->MainThreadEventTarget();
}
RefPtr<CreateImageBitmapFromBlob> task = CreateImageBitmapFromBlob::Create(
aPromise, aGlobal, aBlob, aCropRect, mainThreadEventTarget);
if (NS_WARN_IF(!task)) {
aPromise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
NS_DispatchToCurrentThread(task);
}
/* static */
already_AddRefed<Promise> ImageBitmap::Create(
nsIGlobalObject* aGlobal, const ImageBitmapSource& aSrc,
const Maybe<gfx::IntRect>& aCropRect, ErrorResult& aRv) {
MOZ_ASSERT(aGlobal);
RefPtr<Promise> promise = Promise::Create(aGlobal, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
if (aCropRect.isSome()) {
if (aCropRect->Width() == 0) {
aRv.ThrowRangeError(
"The crop rect width passed to createImageBitmap must be nonzero");
return promise.forget();
}
if (aCropRect->Height() == 0) {
aRv.ThrowRangeError(
"The crop rect height passed to createImageBitmap must be nonzero");
return promise.forget();
}
}
RefPtr<ImageBitmap> imageBitmap;
if (aSrc.IsHTMLImageElement()) {
MOZ_ASSERT(
NS_IsMainThread(),
"Creating ImageBitmap from HTMLImageElement off the main thread.");
imageBitmap =
CreateInternal(aGlobal, aSrc.GetAsHTMLImageElement(), aCropRect, aRv);
} else if (aSrc.IsSVGImageElement()) {
MOZ_ASSERT(
NS_IsMainThread(),
"Creating ImageBitmap from SVGImageElement off the main thread.");
imageBitmap =
CreateInternal(aGlobal, aSrc.GetAsSVGImageElement(), aCropRect, aRv);
} else if (aSrc.IsHTMLVideoElement()) {
MOZ_ASSERT(
NS_IsMainThread(),
"Creating ImageBitmap from HTMLVideoElement off the main thread.");
imageBitmap =
CreateInternal(aGlobal, aSrc.GetAsHTMLVideoElement(), aCropRect, aRv);
} else if (aSrc.IsHTMLCanvasElement()) {
MOZ_ASSERT(
NS_IsMainThread(),
"Creating ImageBitmap from HTMLCanvasElement off the main thread.");
imageBitmap =
CreateInternal(aGlobal, aSrc.GetAsHTMLCanvasElement(), aCropRect, aRv);
} else if (aSrc.IsImageData()) {
imageBitmap =
CreateInternal(aGlobal, aSrc.GetAsImageData(), aCropRect, aRv);
} else if (aSrc.IsCanvasRenderingContext2D()) {
MOZ_ASSERT(NS_IsMainThread(),
"Creating ImageBitmap from CanvasRenderingContext2D off the "
"main thread.");
imageBitmap = CreateInternal(aGlobal, aSrc.GetAsCanvasRenderingContext2D(),
aCropRect, aRv);
} else if (aSrc.IsImageBitmap()) {
imageBitmap =
CreateInternal(aGlobal, aSrc.GetAsImageBitmap(), aCropRect, aRv);
} else if (aSrc.IsBlob()) {
AsyncCreateImageBitmapFromBlob(promise, aGlobal, aSrc.GetAsBlob(),
aCropRect);
return promise.forget();
} else {
MOZ_CRASH("Unsupported type!");
return nullptr;
}
if (!aRv.Failed()) {
AsyncFulfillImageBitmapPromise(promise, imageBitmap);
}
return promise.forget();
}
/*static*/
JSObject* ImageBitmap::ReadStructuredClone(
JSContext* aCx, JSStructuredCloneReader* aReader, nsIGlobalObject* aParent,
const nsTArray<RefPtr<DataSourceSurface>>& aClonedSurfaces,
uint32_t aIndex) {
MOZ_ASSERT(aCx);
MOZ_ASSERT(aReader);
// aParent might be null.
uint32_t picRectX_;
uint32_t picRectY_;
uint32_t picRectWidth_;
uint32_t picRectHeight_;
uint32_t alphaType_;
uint32_t writeOnly;
if (!JS_ReadUint32Pair(aReader, &picRectX_, &picRectY_) ||
!JS_ReadUint32Pair(aReader, &picRectWidth_, &picRectHeight_) ||
!JS_ReadUint32Pair(aReader, &alphaType_, &writeOnly)) {
return nullptr;
}
int32_t picRectX = BitwiseCast<int32_t>(picRectX_);
int32_t picRectY = BitwiseCast<int32_t>(picRectY_);
int32_t picRectWidth = BitwiseCast<int32_t>(picRectWidth_);
int32_t picRectHeight = BitwiseCast<int32_t>(picRectHeight_);
const auto alphaType = BitwiseCast<gfxAlphaType>(alphaType_);
// Create a new ImageBitmap.
MOZ_ASSERT(!aClonedSurfaces.IsEmpty());
MOZ_ASSERT(aIndex < aClonedSurfaces.Length());
// RefPtr<ImageBitmap> needs to go out of scope before toObjectOrNull() is
// called because the static analysis thinks dereferencing XPCOM objects
// can GC (because in some cases it can!), and a return statement with a
// JSObject* type means that JSObject* is on the stack as a raw pointer
// while destructors are running.
JS::Rooted<JS::Value> value(aCx);
{
#ifdef FUZZING
if (aIndex >= aClonedSurfaces.Length()) {
return nullptr;
}
#endif
RefPtr<layers::Image> img = CreateImageFromSurface(aClonedSurfaces[aIndex]);
RefPtr<ImageBitmap> imageBitmap =
new ImageBitmap(aParent, img, !!writeOnly, alphaType);
ErrorResult error;
imageBitmap->SetPictureRect(
IntRect(picRectX, picRectY, picRectWidth, picRectHeight), error);
if (NS_WARN_IF(error.Failed())) {
error.SuppressException();
return nullptr;
}
if (!GetOrCreateDOMReflector(aCx, imageBitmap, &value)) {
return nullptr;
}
imageBitmap->mAllocatedImageData = true;
}
return &(value.toObject());
}
/*static*/
bool ImageBitmap::WriteStructuredClone(
JSStructuredCloneWriter* aWriter,
nsTArray<RefPtr<DataSourceSurface>>& aClonedSurfaces,
ImageBitmap* aImageBitmap) {
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aImageBitmap);
if (!aImageBitmap->mData) {
// A closed image cannot be cloned.
return false;
}
const uint32_t picRectX = BitwiseCast<uint32_t>(aImageBitmap->mPictureRect.x);
const uint32_t picRectY = BitwiseCast<uint32_t>(aImageBitmap->mPictureRect.y);
const uint32_t picRectWidth =
BitwiseCast<uint32_t>(aImageBitmap->mPictureRect.width);
const uint32_t picRectHeight =
BitwiseCast<uint32_t>(aImageBitmap->mPictureRect.height);
const uint32_t alphaType = BitwiseCast<uint32_t>(aImageBitmap->mAlphaType);
// Indexing the cloned surfaces and send the index to the receiver.
uint32_t index = aClonedSurfaces.Length();
if (NS_WARN_IF(!JS_WriteUint32Pair(aWriter, SCTAG_DOM_IMAGEBITMAP, index)) ||
NS_WARN_IF(!JS_WriteUint32Pair(aWriter, picRectX, picRectY)) ||
NS_WARN_IF(!JS_WriteUint32Pair(aWriter, picRectWidth, picRectHeight)) ||
NS_WARN_IF(
!JS_WriteUint32Pair(aWriter, alphaType, aImageBitmap->mWriteOnly))) {
return false;
}
RefPtr<SourceSurface> surface = aImageBitmap->mData->GetAsSourceSurface();
RefPtr<DataSourceSurface> snapshot = surface->GetDataSurface();
RefPtr<DataSourceSurface> dstDataSurface;
{
// DataSourceSurfaceD2D1::GetStride() will call EnsureMapped implicitly and
// won't Unmap after exiting function. So instead calling GetStride()
// directly, using ScopedMap to get stride.
DataSourceSurface::ScopedMap map(snapshot, DataSourceSurface::READ);
dstDataSurface = Factory::CreateDataSourceSurfaceWithStride(
snapshot->GetSize(), snapshot->GetFormat(), map.GetStride(), true);
}
if (NS_WARN_IF(!dstDataSurface)) {
return false;
}
Factory::CopyDataSourceSurface(snapshot, dstDataSurface);
aClonedSurfaces.AppendElement(dstDataSurface);
return true;
}
size_t ImageBitmap::GetAllocatedSize() const {
if (!mAllocatedImageData) {
return 0;
}
// Calculate how many bytes are used.
if (mData->GetFormat() == mozilla::ImageFormat::PLANAR_YCBCR) {
return mData->AsPlanarYCbCrImage()->GetDataSize();
}
if (mData->GetFormat() == mozilla::ImageFormat::NV_IMAGE) {
return mData->AsNVImage()->GetBufferSize();
}
RefPtr<SourceSurface> surface = mData->GetAsSourceSurface();
const int bytesPerPixel = BytesPerPixel(surface->GetFormat());
return surface->GetSize().height * surface->GetSize().width * bytesPerPixel;
}
size_t BindingJSObjectMallocBytes(ImageBitmap* aBitmap) {
return aBitmap->GetAllocatedSize();
}
/* static */
already_AddRefed<CreateImageBitmapFromBlob> CreateImageBitmapFromBlob::Create(
Promise* aPromise, nsIGlobalObject* aGlobal, Blob& aBlob,
const Maybe<IntRect>& aCropRect, nsIEventTarget* aMainThreadEventTarget) {
// Get the internal stream of the blob.
nsCOMPtr<nsIInputStream> stream;
ErrorResult error;
aBlob.Impl()->CreateInputStream(getter_AddRefs(stream), error);
if (NS_WARN_IF(error.Failed())) {
return nullptr;
}
if (!NS_InputStreamIsBuffered(stream)) {
nsCOMPtr<nsIInputStream> bufferedStream;
nsresult rv = NS_NewBufferedInputStream(getter_AddRefs(bufferedStream),
stream.forget(), 4096);
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
stream = bufferedStream;
}
RefPtr<CreateImageBitmapFromBlob> task = new CreateImageBitmapFromBlob(
aPromise, aGlobal, stream.forget(), aCropRect, aMainThreadEventTarget);
// Nothing to do for the main-thread.
if (NS_IsMainThread()) {
return task.forget();
}
// Let's use a WorkerRef to keep the worker alive if this is not the
// main-thread.
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
RefPtr<StrongWorkerRef> workerRef =
StrongWorkerRef::Create(workerPrivate, "CreateImageBitmapFromBlob",
[task]() { task->WorkerShuttingDown(); });
if (NS_WARN_IF(!workerRef)) {
return nullptr;
}
task->mWorkerRef = new ThreadSafeWorkerRef(workerRef);
return task.forget();
}
nsresult CreateImageBitmapFromBlob::StartMimeTypeAndDecodeAndCropBlob() {
MOZ_ASSERT(IsCurrentThread());
// Workers.
if (!NS_IsMainThread()) {
RefPtr<CreateImageBitmapFromBlob> self = this;
nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
"CreateImageBitmapFromBlob::MimeTypeAndDecodeAndCropBlob", [self]() {
nsresult rv = self->MimeTypeAndDecodeAndCropBlob();
if (NS_WARN_IF(NS_FAILED(rv))) {
self->MimeTypeAndDecodeAndCropBlobCompletedMainThread(nullptr, rv);
}
});
return mMainThreadEventTarget->Dispatch(r.forget());
}
// Main-thread.
return MimeTypeAndDecodeAndCropBlob();
}
nsresult CreateImageBitmapFromBlob::MimeTypeAndDecodeAndCropBlob() {
MOZ_ASSERT(NS_IsMainThread());
nsAutoCString mimeType;
nsresult rv = GetMimeTypeSync(mimeType);
if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
return GetMimeTypeAsync();
}
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return DecodeAndCropBlob(mimeType);
}
nsresult CreateImageBitmapFromBlob::DecodeAndCropBlob(
const nsACString& aMimeType) {
// Get the Component object.
nsCOMPtr<imgITools> imgtool = do_GetService(NS_IMGTOOLS_CID);
if (NS_WARN_IF(!imgtool)) {
return NS_ERROR_FAILURE;
}
// Decode image.
nsresult rv = imgtool->DecodeImageAsync(mInputStream, aMimeType, this,
mMainThreadEventTarget);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
static nsresult sniff_cb(nsIInputStream* aInputStream, void* aClosure,
const char* aFromRawSegment, uint32_t aToOffset,
uint32_t aCount, uint32_t* aWriteCount) {
nsACString* mimeType = static_cast<nsACString*>(aClosure);
MOZ_ASSERT(mimeType);
if (aCount > 0) {
imgLoader::GetMimeTypeFromContent(aFromRawSegment, aCount, *mimeType);
}
*aWriteCount = 0;
// We don't want to consume data from the stream.
return NS_ERROR_FAILURE;
}
nsresult CreateImageBitmapFromBlob::GetMimeTypeSync(nsACString& aMimeType) {
uint32_t dummy;
return mInputStream->ReadSegments(sniff_cb, &aMimeType, 128, &dummy);
}
nsresult CreateImageBitmapFromBlob::GetMimeTypeAsync() {
nsCOMPtr<nsIAsyncInputStream> asyncInputStream =
do_QueryInterface(mInputStream);
if (NS_WARN_IF(!asyncInputStream)) {
// If the stream is not async, why are we here?
return NS_ERROR_FAILURE;
}
return asyncInputStream->AsyncWait(this, 0, 128, mMainThreadEventTarget);
}
NS_IMETHODIMP
CreateImageBitmapFromBlob::OnInputStreamReady(nsIAsyncInputStream* aStream) {
// The stream should have data now. Let's start from scratch again.
nsresult rv = MimeTypeAndDecodeAndCropBlob();
if (NS_WARN_IF(NS_FAILED(rv))) {
MimeTypeAndDecodeAndCropBlobCompletedMainThread(nullptr, rv);
}
return NS_OK;
}
NS_IMETHODIMP
CreateImageBitmapFromBlob::OnImageReady(imgIContainer* aImgContainer,
nsresult aStatus) {
MOZ_ASSERT(NS_IsMainThread());
if (NS_FAILED(aStatus)) {
MimeTypeAndDecodeAndCropBlobCompletedMainThread(nullptr, aStatus);
return NS_OK;
}
MOZ_ASSERT(aImgContainer);
// Get the surface out.
uint32_t frameFlags = imgIContainer::FLAG_SYNC_DECODE |
imgIContainer::FLAG_ASYNC_NOTIFY |
imgIContainer::FLAG_WANT_DATA_SURFACE;
uint32_t whichFrame = imgIContainer::FRAME_FIRST;
RefPtr<SourceSurface> surface =
aImgContainer->GetFrame(whichFrame, frameFlags);
if (NS_WARN_IF(!surface)) {
MimeTypeAndDecodeAndCropBlobCompletedMainThread(
nullptr, NS_ERROR_DOM_INVALID_STATE_ERR);
return NS_OK;
}
// Store the sourceSize value for the
// MimeTypeAndDecodeAndCropBlobCompletedMainThread call.
mSourceSize = surface->GetSize();
// Crop the source surface if needed.
RefPtr<SourceSurface> croppedSurface = surface;
if (mCropRect.isSome()) {
// The blob is just decoded into a RasterImage and not optimized yet, so the
// _surface_ we get is a DataSourceSurface which wraps the RasterImage's
// raw buffer.
//
// The _surface_ might already be optimized so that its type is not
// SurfaceType::DATA. However, we could keep using the generic cropping and
// copying since the decoded buffer is only used in this ImageBitmap so we
// should crop it to save memory usage.
//
// TODO: Bug1189632 is going to refactor this create-from-blob part to
// decode the blob off the main thread. Re-check if we should do
// cropping at this moment again there.
RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
croppedSurface = CropAndCopyDataSourceSurface(dataSurface, mCropRect.ref());
mCropRect->MoveTo(0, 0);
}
if (NS_WARN_IF(!croppedSurface)) {
MimeTypeAndDecodeAndCropBlobCompletedMainThread(
nullptr, NS_ERROR_DOM_INVALID_STATE_ERR);
return NS_OK;
}
// Create an Image from the source surface.
RefPtr<layers::Image> image = CreateImageFromSurface(croppedSurface);
if (NS_WARN_IF(!image)) {
MimeTypeAndDecodeAndCropBlobCompletedMainThread(
nullptr, NS_ERROR_DOM_INVALID_STATE_ERR);
return NS_OK;
}
MimeTypeAndDecodeAndCropBlobCompletedMainThread(image, NS_OK);
return NS_OK;
}
void CreateImageBitmapFromBlob::MimeTypeAndDecodeAndCropBlobCompletedMainThread(
layers::Image* aImage, nsresult aStatus) {
MOZ_ASSERT(NS_IsMainThread());
if (!IsCurrentThread()) {
MutexAutoLock lock(mMutex);
if (!mWorkerRef) {
// The worker is already gone.
return;
}
RefPtr<CreateImageBitmapFromBlobRunnable> r =
new CreateImageBitmapFromBlobRunnable(mWorkerRef->Private(), this,
aImage, aStatus);
r->Dispatch();
return;
}
MimeTypeAndDecodeAndCropBlobCompletedOwningThread(aImage, aStatus);
}
void CreateImageBitmapFromBlob::
MimeTypeAndDecodeAndCropBlobCompletedOwningThread(layers::Image* aImage,
nsresult aStatus) {
MOZ_ASSERT(IsCurrentThread());
if (!mPromise) {
// The worker is going to be released soon. No needs to continue.
return;
}
// Let's release what has to be released on the owning thread.
auto raii = MakeScopeExit([&] {
// Doing this we also release the worker.
mWorkerRef = nullptr;
mPromise = nullptr;
mGlobalObject = nullptr;
});
if (NS_WARN_IF(NS_FAILED(aStatus))) {
mPromise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
// Create ImageBitmap object.
RefPtr<ImageBitmap> imageBitmap =
new ImageBitmap(mGlobalObject, aImage, false /* write-only */);
if (mCropRect.isSome()) {
ErrorResult rv;
imageBitmap->SetPictureRect(mCropRect.ref(), rv);
if (rv.Failed()) {
mPromise->MaybeReject(std::move(rv));
return;
}
}
imageBitmap->mAllocatedImageData = true;
mPromise->MaybeResolve(imageBitmap);
}
void CreateImageBitmapFromBlob::WorkerShuttingDown() {
MOZ_ASSERT(IsCurrentThread());
MutexAutoLock lock(mMutex);
// Let's release all the non-thread-safe objects now.
mWorkerRef = nullptr;
mPromise = nullptr;
mGlobalObject = nullptr;
}
} // namespace dom
} // namespace mozilla
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