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gecko-dev/dom/canvas/ImageBitmap.cpp

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68 KiB
C++
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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/dom/ImageBitmapBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/StructuredCloneTags.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/gfx/2D.h"
#include "ImageBitmapColorUtils.h"
#include "ImageBitmapUtils.h"
#include "ImageUtils.h"
#include "imgTools.h"
#include "libyuv.h"
using namespace mozilla::gfx;
using namespace mozilla::layers;
namespace mozilla {
namespace dom {
using namespace workers;
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
/*
* 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())) {
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;
const uint32_t copiedBytesPerRaw = surfPortion.width * bytesPerPixel;
for (int i = 0; i < surfPortion.height; ++i) {
memcpy(dstBufferPtr, srcBufferPtr, copiedBytesPerRaw);
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();
RefPtr<DataSourceSurface> bgraDataSurface =
Factory::CreateDataSourceSurfaceWithStride(rgbaDataSurface->GetSize(),
SurfaceFormat::B8G8R8A8,
rgbaDataSurface->Stride());
DataSourceSurface::MappedSurface rgbaMap;
DataSourceSurface::MappedSurface bgraMap;
if (NS_WARN_IF(!rgbaDataSurface->Map(DataSourceSurface::MapType::READ, &rgbaMap)) ||
NS_WARN_IF(!bgraDataSurface->Map(DataSourceSurface::MapType::WRITE, &bgraMap))) {
return nullptr;
}
libyuv::ABGRToARGB(rgbaMap.mData, rgbaMap.mStride,
bgraMap.mData, bgraMap.mStride,
bgraDataSurface->GetSize().width,
bgraDataSurface->GetSize().height);
rgbaDataSurface->Unmap();
bgraDataSurface->Unmap();
// 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;
};
static bool
CheckSecurityForHTMLElements(bool aIsWriteOnly, bool aCORSUsed, nsIPrincipal* aPrincipal)
{
MOZ_ASSERT(aPrincipal);
if (aIsWriteOnly) {
return false;
}
if (!aCORSUsed) {
nsIGlobalObject* incumbentSettingsObject = GetIncumbentGlobal();
if (NS_WARN_IF(!incumbentSettingsObject)) {
return false;
}
nsIPrincipal* principal = incumbentSettingsObject->PrincipalOrNull();
if (NS_WARN_IF(!principal) || !(principal->Subsumes(aPrincipal))) {
return false;
}
}
return true;
}
static bool
CheckSecurityForHTMLElements(const nsLayoutUtils::SurfaceFromElementResult& aRes)
{
return CheckSecurityForHTMLElements(aRes.mIsWriteOnly, aRes.mCORSUsed, aRes.mPrincipal);
}
/*
* A wrapper to the nsLayoutUtils::SurfaceFromElement() function followed by the
* security checking.
*/
template<class HTMLElementType>
static already_AddRefed<SourceSurface>
GetSurfaceFromElement(nsIGlobalObject* aGlobal, HTMLElementType& aElement, ErrorResult& aRv)
{
nsLayoutUtils::SurfaceFromElementResult res =
nsLayoutUtils::SurfaceFromElement(&aElement, nsLayoutUtils::SFE_WANT_FIRST_FRAME);
// check origin-clean
if (!CheckSecurityForHTMLElements(res)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
RefPtr<SourceSurface> surface = res.GetSourceSurface();
if (NS_WARN_IF(!surface)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
return surface.forget();
}
/*
* The specification doesn't allow to create an ImegeBitmap from a vector image.
* This function is used to check if the given HTMLImageElement contains a
* raster image.
*/
static bool
HasRasterImage(HTMLImageElement& aImageEl)
{
nsresult rv;
nsCOMPtr<imgIRequest> imgRequest;
rv = aImageEl.GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
if (NS_SUCCEEDED(rv) && imgRequest) {
nsCOMPtr<imgIContainer> imgContainer;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
if (NS_SUCCEEDED(rv) && imgContainer &&
imgContainer->GetType() == imgIContainer::TYPE_RASTER) {
return true;
}
}
return false;
}
ImageBitmap::ImageBitmap(nsIGlobalObject* aGlobal, layers::Image* aData,
bool aIsPremultipliedAlpha /* = true */)
: mParent(aGlobal)
, mData(aData)
, mSurface(nullptr)
, mDataWrapper(new ImageUtils(mData))
, mPictureRect(0, 0, aData->GetSize().width, aData->GetSize().height)
, mIsPremultipliedAlpha(aIsPremultipliedAlpha)
, mIsCroppingAreaOutSideOfSourceImage(false)
{
MOZ_ASSERT(aData, "aData is null in ImageBitmap constructor.");
}
ImageBitmap::~ImageBitmap()
{
}
JSObject*
ImageBitmap::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return ImageBitmapBinding::Wrap(aCx, this, aGivenProto);
}
void
ImageBitmap::Close()
{
mData = nullptr;
mSurface = nullptr;
mPictureRect.SetEmpty();
}
void
ImageBitmap::SetPictureRect(const IntRect& aRect, ErrorResult& aRv)
{
mPictureRect = FixUpNegativeDimension(aRect, aRv);
}
void
ImageBitmap::SetIsCroppingAreaOutSideOfSourceImage(const IntSize& aSourceSize,
const Maybe<IntRect>& aCroppingRect)
{
// No cropping at all.
if (aCroppingRect.isNothing()) {
mIsCroppingAreaOutSideOfSourceImage = false;
return;
}
if (aCroppingRect->X() < 0 || aCroppingRect->Y() < 0 ||
aCroppingRect->Width() > aSourceSize.width ||
aCroppingRect->Height() > aSourceSize.height) {
mIsCroppingAreaOutSideOfSourceImage = true;
}
}
static already_AddRefed<SourceSurface>
ConvertColorFormatIfNeeded(RefPtr<SourceSurface> aSurface)
{
const SurfaceFormat srcFormat = aSurface->GetFormat();
if (srcFormat == SurfaceFormat::R8G8B8A8 ||
srcFormat == SurfaceFormat::B8G8R8A8 ||
srcFormat == SurfaceFormat::R8G8B8X8 ||
srcFormat == SurfaceFormat::B8G8R8X8 ||
srcFormat == SurfaceFormat::A8R8G8B8 ||
srcFormat == SurfaceFormat::X8R8G8B8) {
return aSurface.forget();
}
if (srcFormat == SurfaceFormat::A8 ||
srcFormat == SurfaceFormat::Depth) {
return nullptr;
}
const int bytesPerPixel = BytesPerPixel(SurfaceFormat::B8G8R8A8);
const IntSize dstSize = aSurface->GetSize();
const uint32_t dstStride = dstSize.width * bytesPerPixel;
RefPtr<DataSourceSurface> dstDataSurface =
Factory::CreateDataSourceSurfaceWithStride(dstSize,
SurfaceFormat::B8G8R8A8,
dstStride);
RefPtr<DataSourceSurface> srcDataSurface = aSurface->GetDataSurface();
if (NS_WARN_IF(!srcDataSurface)) {
return nullptr;
}
DataSourceSurface::ScopedMap srcMap(srcDataSurface, DataSourceSurface::READ);
DataSourceSurface::ScopedMap dstMap(dstDataSurface, DataSourceSurface::WRITE);
if (NS_WARN_IF(!srcMap.IsMapped()) || NS_WARN_IF(!dstMap.IsMapped())) {
return nullptr;
}
int rv = 0;
if (srcFormat == SurfaceFormat::R8G8B8) {
rv = RGB24ToBGRA32(srcMap.GetData(), srcMap.GetStride(),
dstMap.GetData(), dstMap.GetStride(),
dstSize.width, dstSize.height);
} else if (srcFormat == SurfaceFormat::B8G8R8) {
rv = BGR24ToBGRA32(srcMap.GetData(), srcMap.GetStride(),
dstMap.GetData(), dstMap.GetStride(),
dstSize.width, dstSize.height);
} else if (srcFormat == SurfaceFormat::HSV) {
rv = HSVToBGRA32((const float*)srcMap.GetData(), srcMap.GetStride(),
dstMap.GetData(), dstMap.GetStride(),
dstSize.width, dstSize.height);
} else if (srcFormat == SurfaceFormat::Lab) {
rv = LabToBGRA32((const float*)srcMap.GetData(), srcMap.GetStride(),
dstMap.GetData(), dstMap.GetStride(),
dstSize.width, dstSize.height);
}
if (NS_WARN_IF(rv != 0)) {
return nullptr;
}
return dstDataSurface.forget();
}
/*
* 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;
}
}
// Check if we need to convert the format.
// Convert R8G8B8/B8G8R8/HSV/Lab to B8G8R8A8.
// Return null if the original format is A8 or Depth.
mSurface = ConvertColorFormatIfNeeded(mSurface);
if (NS_WARN_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.
// Apply pre-multiply alpha only if mIsPremultipliedAlpha is false.
// Ignore this step if the source surface does not have alpha channel; this
// kind of source surfaces might come form layers::PlanarYCbCrImage.
if (!mIsPremultipliedAlpha &&
mSurface->GetFormat() != SurfaceFormat::B8G8R8X8 &&
mSurface->GetFormat() != SurfaceFormat::R8G8B8X8 &&
mSurface->GetFormat() != SurfaceFormat::X8R8G8B8) {
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)) {
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;
}
}
uint8_t rIndex = 0;
uint8_t gIndex = 0;
uint8_t bIndex = 0;
uint8_t aIndex = 0;
if (mSurface->GetFormat() == SurfaceFormat::R8G8B8A8) {
rIndex = 0;
gIndex = 1;
bIndex = 2;
aIndex = 3;
} else if (mSurface->GetFormat() == SurfaceFormat::B8G8R8A8) {
rIndex = 2;
gIndex = 1;
bIndex = 0;
aIndex = 3;
} else if (mSurface->GetFormat() == SurfaceFormat::A8R8G8B8) {
rIndex = 1;
gIndex = 2;
bIndex = 3;
aIndex = 0;
}
for (int i = 0; i < dstSurface->GetSize().height; ++i) {
uint8_t* bufferPtr = dstMap.mData + dstMap.mStride * i;
uint8_t* srcBufferPtr = srcSurface ? srcMap.mData + srcMap.mStride * i : bufferPtr;
for (int i = 0; i < dstSurface->GetSize().width; ++i) {
uint8_t r = *(srcBufferPtr+rIndex);
uint8_t g = *(srcBufferPtr+gIndex);
uint8_t b = *(srcBufferPtr+bIndex);
uint8_t a = *(srcBufferPtr+aIndex);
*(bufferPtr+rIndex) = gfxUtils::sPremultiplyTable[a * 256 + r];
*(bufferPtr+gIndex) = gfxUtils::sPremultiplyTable[a * 256 + g];
*(bufferPtr+bIndex) = gfxUtils::sPremultiplyTable[a * 256 + b];
*(bufferPtr+aIndex) = a;
bufferPtr += 4;
srcBufferPtr += 4;
}
}
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();
}
ImageBitmapCloneData*
ImageBitmap::ToCloneData()
{
ImageBitmapCloneData* result = new ImageBitmapCloneData();
result->mPictureRect = mPictureRect;
result->mIsPremultipliedAlpha = mIsPremultipliedAlpha;
result->mIsCroppingAreaOutSideOfSourceImage = mIsCroppingAreaOutSideOfSourceImage;
RefPtr<SourceSurface> surface = mData->GetAsSourceSurface();
result->mSurface = surface->GetDataSurface();
MOZ_ASSERT(result->mSurface);
return result;
}
/* 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->mIsPremultipliedAlpha);
ret->mIsCroppingAreaOutSideOfSourceImage =
aData->mIsCroppingAreaOutSideOfSourceImage;
ErrorResult rv;
ret->SetPictureRect(aData->mPictureRect, rv);
return ret.forget();
}
/* static */ already_AddRefed<ImageBitmap>
ImageBitmap::CreateFromOffscreenCanvas(nsIGlobalObject* aGlobal,
OffscreenCanvas& aOffscreenCanvas,
ErrorResult& aRv)
{
// Check origin-clean.
if (aOffscreenCanvas.IsWriteOnly()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
nsLayoutUtils::SurfaceFromElementResult res =
nsLayoutUtils::SurfaceFromOffscreenCanvas(&aOffscreenCanvas,
nsLayoutUtils::SFE_WANT_FIRST_FRAME);
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);
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;
}
// Check if the image element is a bitmap (e.g. it's a vector graphic) or not.
if (!HasRasterImage(aImageEl)) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Get the SourceSurface out from the image element and then do security
// checking.
RefPtr<SourceSurface> surface = GetSurfaceFromElement(aGlobal, aImageEl, 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);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
// Set mIsCroppingAreaOutSideOfSourceImage.
ret->SetIsCroppingAreaOutSideOfSourceImage(surface->GetSize(), aCropRect);
return ret.forget();
}
/* static */ already_AddRefed<ImageBitmap>
ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, HTMLVideoElement& aVideoEl,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv)
{
// Check network state.
if (aVideoEl.NetworkState() == HTMLMediaElement::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() <= HTMLMediaElement::HAVE_METADATA) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Check security.
nsCOMPtr<nsIPrincipal> principal = aVideoEl.GetCurrentVideoPrincipal();
bool CORSUsed = aVideoEl.GetCORSMode() != CORS_NONE;
if (!CheckSecurityForHTMLElements(false, CORSUsed, principal)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
// Create ImageBitmap.
ImageContainer *container = aVideoEl.GetImageContainer();
if (!container) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
AutoLockImage lockImage(container);
layers::Image* data = lockImage.GetImage();
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
// Set mIsCroppingAreaOutSideOfSourceImage.
ret->SetIsCroppingAreaOutSideOfSourceImage(data->GetSize(), aCropRect);
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;
}
RefPtr<SourceSurface> surface = GetSurfaceFromElement(aGlobal, aCanvasEl, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
// Crop the source surface if needed.
RefPtr<SourceSurface> croppedSurface;
IntRect cropRect = aCropRect.valueOr(IntRect());
// If the HTMLCanvasElement's rendering context is WebGL, 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.
if ((aCanvasEl.GetCurrentContextType() == CanvasContextType::WebGL1 ||
aCanvasEl.GetCurrentContextType() == CanvasContextType::WebGL2) &&
aCropRect.isSome()) {
// The _surface_ must be a DataSourceSurface.
MOZ_ASSERT(surface->GetType() == SurfaceType::DATA,
"The snapshot SourceSurface from WebGL rendering contest is not \
DataSourceSurface.");
RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
croppedSurface = CropAndCopyDataSourceSurface(dataSurface, cropRect);
cropRect.MoveTo(0, 0);
}
else {
croppedSurface = surface;
}
if (NS_WARN_IF(!croppedSurface)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
// Create an Image from the SourceSurface.
RefPtr<layers::Image> data = CreateImageFromSurface(croppedSurface);
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(cropRect, aRv);
}
// Set mIsCroppingAreaOutSideOfSourceImage.
ret->SetIsCroppingAreaOutSideOfSourceImage(surface->GetSize(), aCropRect);
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.ComputeLengthAndData();
const SurfaceFormat FORMAT = SurfaceFormat::R8G8B8A8;
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(aRv);
}
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return nullptr;
}
// Create an ImageBimtap.
// ImageData's underlying data is not alpha-premultiplied.
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, false);
// The cropping information has been handled in the CreateImageFromRawData()
// function.
// Set mIsCroppingAreaOutSideOfSourceImage.
ret->SetIsCroppingAreaOutSideOfSourceImage(imageSize, aCropRect);
return ret.forget();
}
/* static */ already_AddRefed<ImageBitmap>
ImageBitmap::CreateInternal(nsIGlobalObject* aGlobal, CanvasRenderingContext2D& aCanvasCtx,
const Maybe<IntRect>& aCropRect, ErrorResult& aRv)
{
// Check origin-clean.
if (aCanvasCtx.GetCanvas()->IsWriteOnly()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
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);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
// Set mIsCroppingAreaOutSideOfSourceImage.
ret->SetIsCroppingAreaOutSideOfSourceImage(surface->GetSize(), aCropRect);
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_NOT_AVAILABLE);
return nullptr;
}
RefPtr<layers::Image> data = aImageBitmap.mData;
RefPtr<ImageBitmap> ret = new ImageBitmap(aGlobal, data, aImageBitmap.mIsPremultipliedAlpha);
// Set the picture rectangle.
if (ret && aCropRect.isSome()) {
ret->SetPictureRect(aCropRect.ref(), aRv);
}
// Set mIsCroppingAreaOutSideOfSourceImage.
if (aImageBitmap.mIsCroppingAreaOutSideOfSourceImage == true) {
ret->mIsCroppingAreaOutSideOfSourceImage = true;
} else {
ret->SetIsCroppingAreaOutSideOfSourceImage(aImageBitmap.mPictureRect.Size(),
aCropRect);
}
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)
: 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.
}
}
static already_AddRefed<SourceSurface>
DecodeBlob(Blob& aBlob)
{
// Get the internal stream of the blob.
nsCOMPtr<nsIInputStream> stream;
ErrorResult error;
aBlob.Impl()->GetInternalStream(getter_AddRefs(stream), error);
if (NS_WARN_IF(error.Failed())) {
return nullptr;
}
// Get the MIME type string of the blob.
// The type will be checked in the DecodeImage() method.
nsAutoString mimeTypeUTF16;
aBlob.GetType(mimeTypeUTF16);
// Get the Component object.
nsCOMPtr<imgITools> imgtool = do_GetService(NS_IMGTOOLS_CID);
if (NS_WARN_IF(!imgtool)) {
return nullptr;
}
// Decode image.
NS_ConvertUTF16toUTF8 mimeTypeUTF8(mimeTypeUTF16); // NS_ConvertUTF16toUTF8 ---|> nsAutoCString
nsCOMPtr<imgIContainer> imgContainer;
nsresult rv = imgtool->DecodeImage(stream, mimeTypeUTF8, getter_AddRefs(imgContainer));
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
// Get the surface out.
uint32_t frameFlags = imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_WANT_DATA_SURFACE;
uint32_t whichFrame = imgIContainer::FRAME_FIRST;
RefPtr<SourceSurface> surface = imgContainer->GetFrame(whichFrame, frameFlags);
if (NS_WARN_IF(!surface)) {
return nullptr;
}
return surface.forget();
}
static already_AddRefed<layers::Image>
DecodeAndCropBlob(Blob& aBlob, Maybe<IntRect>& aCropRect,
/*Output*/ IntSize& sourceSize)
{
// Decode the blob into a SourceSurface.
RefPtr<SourceSurface> surface = DecodeBlob(aBlob);
if (NS_WARN_IF(!surface)) {
return nullptr;
}
// Set the _sourceSize_ output parameter.
sourceSize = surface->GetSize();
// Crop the source surface if needed.
RefPtr<SourceSurface> croppedSurface = surface;
if (aCropRect.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, aCropRect.ref());
aCropRect->MoveTo(0, 0);
}
if (NS_WARN_IF(!croppedSurface)) {
return nullptr;
}
// Create an Image from the source surface.
RefPtr<layers::Image> image = CreateImageFromSurface(croppedSurface);
if (NS_WARN_IF(!image)) {
return nullptr;
}
return image.forget();
}
class CreateImageBitmapFromBlob
{
protected:
CreateImageBitmapFromBlob(Promise* aPromise,
nsIGlobalObject* aGlobal,
Blob& aBlob,
const Maybe<IntRect>& aCropRect)
: mPromise(aPromise),
mGlobalObject(aGlobal),
mBlob(&aBlob),
mCropRect(aCropRect)
{
}
virtual ~CreateImageBitmapFromBlob()
{
}
// Returns true on success, false on failure.
bool DoCreateImageBitmapFromBlob()
{
RefPtr<ImageBitmap> imageBitmap = CreateImageBitmap();
// handle errors while creating ImageBitmap
// (1) error occurs during reading of the object
// (2) the image data is not in a supported file format
// (3) the image data is corrupted
// All these three cases should reject promise with null value
if (!imageBitmap) {
return false;
}
if (imageBitmap && mCropRect.isSome()) {
ErrorResult rv;
imageBitmap->SetPictureRect(mCropRect.ref(), rv);
if (rv.Failed()) {
mPromise->MaybeReject(rv);
return false;
}
}
mPromise->MaybeResolve(imageBitmap);
return true;
}
// Will return null on failure. In that case, mPromise will already
// be rejected with the right thing.
virtual already_AddRefed<ImageBitmap> CreateImageBitmap() = 0;
RefPtr<Promise> mPromise;
nsCOMPtr<nsIGlobalObject> mGlobalObject;
RefPtr<mozilla::dom::Blob> mBlob;
Maybe<IntRect> mCropRect;
};
class CreateImageBitmapFromBlobTask final : public Runnable,
public CreateImageBitmapFromBlob
{
public:
CreateImageBitmapFromBlobTask(Promise* aPromise,
nsIGlobalObject* aGlobal,
Blob& aBlob,
const Maybe<IntRect>& aCropRect)
:CreateImageBitmapFromBlob(aPromise, aGlobal, aBlob, aCropRect)
{
}
NS_IMETHOD Run() override
{
DoCreateImageBitmapFromBlob();
return NS_OK;
}
private:
already_AddRefed<ImageBitmap> CreateImageBitmap() override
{
// _sourceSize_ is used to get the original size of the source image,
// before being cropped.
IntSize sourceSize;
// Keep the orignal cropping rectangle because the mCropRect might be
// modified in DecodeAndCropBlob().
Maybe<IntRect> originalCropRect = mCropRect;
RefPtr<layers::Image> data = DecodeAndCropBlob(*mBlob, mCropRect, sourceSize);
if (NS_WARN_IF(!data)) {
mPromise->MaybeRejectWithNull();
return nullptr;
}
// Create ImageBitmap object.
RefPtr<ImageBitmap> imageBitmap = new ImageBitmap(mGlobalObject, data);
// Set mIsCroppingAreaOutSideOfSourceImage.
imageBitmap->SetIsCroppingAreaOutSideOfSourceImage(sourceSize, originalCropRect);
return imageBitmap.forget();
}
};
class CreateImageBitmapFromBlobWorkerTask final : public WorkerSameThreadRunnable,
public CreateImageBitmapFromBlob
{
// This is a synchronous task.
class DecodeBlobInMainThreadSyncTask final : public WorkerMainThreadRunnable
{
public:
DecodeBlobInMainThreadSyncTask(WorkerPrivate* aWorkerPrivate,
Blob& aBlob,
Maybe<IntRect>& aCropRect,
layers::Image** aImage,
IntSize& aSourceSize)
: WorkerMainThreadRunnable(aWorkerPrivate,
NS_LITERAL_CSTRING("ImageBitmap :: Create Image from Blob"))
, mBlob(aBlob)
, mCropRect(aCropRect)
, mImage(aImage)
, mSourceSize(aSourceSize)
{
}
bool MainThreadRun() override
{
RefPtr<layers::Image> image = DecodeAndCropBlob(mBlob, mCropRect, mSourceSize);
if (NS_WARN_IF(!image)) {
return true;
}
image.forget(mImage);
return true;
}
private:
Blob& mBlob;
Maybe<IntRect>& mCropRect;
layers::Image** mImage;
IntSize mSourceSize;
};
public:
CreateImageBitmapFromBlobWorkerTask(Promise* aPromise,
nsIGlobalObject* aGlobal,
mozilla::dom::Blob& aBlob,
const Maybe<IntRect>& aCropRect)
: WorkerSameThreadRunnable(GetCurrentThreadWorkerPrivate()),
CreateImageBitmapFromBlob(aPromise, aGlobal, aBlob, aCropRect)
{
}
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
{
return DoCreateImageBitmapFromBlob();
}
private:
already_AddRefed<ImageBitmap> CreateImageBitmap() override
{
// _sourceSize_ is used to get the original size of the source image,
// before being cropped.
IntSize sourceSize;
// Keep the orignal cropping rectangle because the mCropRect might be
// modified in DecodeAndCropBlob().
Maybe<IntRect> originalCropRect = mCropRect;
RefPtr<layers::Image> data;
ErrorResult rv;
RefPtr<DecodeBlobInMainThreadSyncTask> task =
new DecodeBlobInMainThreadSyncTask(mWorkerPrivate, *mBlob, mCropRect,
getter_AddRefs(data), sourceSize);
task->Dispatch(rv); // This is a synchronous call.
if (NS_WARN_IF(rv.Failed())) {
// XXXbz does this really make sense if we're shutting down? Ah, well.
mPromise->MaybeReject(rv);
return nullptr;
}
if (NS_WARN_IF(!data)) {
mPromise->MaybeRejectWithNull();
return nullptr;
}
// Create ImageBitmap object.
RefPtr<ImageBitmap> imageBitmap = new ImageBitmap(mGlobalObject, data);
// Set mIsCroppingAreaOutSideOfSourceImage.
imageBitmap->SetIsCroppingAreaOutSideOfSourceImage(sourceSize, originalCropRect);
return imageBitmap.forget();
}
};
static void
AsyncCreateImageBitmapFromBlob(Promise* aPromise, nsIGlobalObject* aGlobal,
Blob& aBlob, const Maybe<IntRect>& aCropRect)
{
if (NS_IsMainThread()) {
nsCOMPtr<nsIRunnable> task =
new CreateImageBitmapFromBlobTask(aPromise, aGlobal, aBlob, aCropRect);
NS_DispatchToCurrentThread(task); // Actually, to the main-thread.
} else {
RefPtr<CreateImageBitmapFromBlobWorkerTask> task =
new CreateImageBitmapFromBlobWorkerTask(aPromise, aGlobal, aBlob, aCropRect);
task->Dispatch(); // Actually, to the current worker-thread.
}
}
/* 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() && (aCropRect->Width() == 0 || aCropRect->Height() == 0)) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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.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 {
aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
}
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 isPremultipliedAlpha_;
uint32_t isCroppingAreaOutSideOfSourceImage_;
if (!JS_ReadUint32Pair(aReader, &picRectX_, &picRectY_) ||
!JS_ReadUint32Pair(aReader, &picRectWidth_, &picRectHeight_) ||
!JS_ReadUint32Pair(aReader, &isPremultipliedAlpha_,
&isCroppingAreaOutSideOfSourceImage_)) {
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_);
// 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);
{
RefPtr<layers::Image> img = CreateImageFromSurface(aClonedSurfaces[aIndex]);
RefPtr<ImageBitmap> imageBitmap =
new ImageBitmap(aParent, img, isPremultipliedAlpha_);
imageBitmap->mIsCroppingAreaOutSideOfSourceImage =
isCroppingAreaOutSideOfSourceImage_;
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;
}
}
return &(value.toObject());
}
/*static*/ bool
ImageBitmap::WriteStructuredClone(JSStructuredCloneWriter* aWriter,
nsTArray<RefPtr<DataSourceSurface>>& aClonedSurfaces,
ImageBitmap* aImageBitmap)
{
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aImageBitmap);
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 isPremultipliedAlpha = aImageBitmap->mIsPremultipliedAlpha ? 1 : 0;
const uint32_t isCroppingAreaOutSideOfSourceImage = aImageBitmap->mIsCroppingAreaOutSideOfSourceImage ? 1 : 0;
// 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, isPremultipliedAlpha,
isCroppingAreaOutSideOfSourceImage))) {
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);
}
MOZ_ASSERT(dstDataSurface);
Factory::CopyDataSourceSurface(snapshot, dstDataSurface);
aClonedSurfaces.AppendElement(dstDataSurface);
return true;
}
/*static*/ bool
ImageBitmap::ExtensionsEnabled(JSContext* aCx, JSObject*)
{
if (NS_IsMainThread()) {
return Preferences::GetBool("canvas.imagebitmap_extensions.enabled");
} else {
WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(aCx);
MOZ_ASSERT(workerPrivate);
return workerPrivate->ImageBitmapExtensionsEnabled();
}
}
// ImageBitmap extensions.
ImageBitmapFormat
ImageBitmap::FindOptimalFormat(const Optional<Sequence<ImageBitmapFormat>>& aPossibleFormats,
ErrorResult& aRv)
{
MOZ_ASSERT(mDataWrapper, "No ImageBitmapFormatUtils functionalities.");
ImageBitmapFormat platformFormat = mDataWrapper->GetFormat();
if (!aPossibleFormats.WasPassed() ||
aPossibleFormats.Value().Contains(platformFormat)) {
return platformFormat;
} else {
// If no matching is found, FindBestMatchingFromat() returns
// ImageBitmapFormat::EndGuard_ and we throw an exception.
ImageBitmapFormat optimalFormat =
FindBestMatchingFromat(platformFormat, aPossibleFormats.Value());
if (optimalFormat == ImageBitmapFormat::EndGuard_) {
aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
}
return optimalFormat;
}
}
int32_t
ImageBitmap::MappedDataLength(ImageBitmapFormat aFormat, ErrorResult& aRv)
{
MOZ_ASSERT(mDataWrapper, "No ImageBitmapFormatUtils functionalities.");
if (aFormat == mDataWrapper->GetFormat()) {
return mDataWrapper->GetBufferLength();
} else {
return CalculateImageBufferSize(aFormat, Width(), Height());
}
}
template<typename T>
class MapDataIntoBufferSource
{
protected:
MapDataIntoBufferSource(JSContext* aCx,
Promise *aPromise,
ImageBitmap *aImageBitmap,
const T& aBuffer,
int32_t aOffset,
ImageBitmapFormat aFormat)
: mPromise(aPromise)
, mImageBitmap(aImageBitmap)
, mBuffer(aCx, aBuffer.Obj())
, mOffset(aOffset)
, mFormat(aFormat)
{
MOZ_ASSERT(mPromise);
MOZ_ASSERT(JS_IsArrayBufferObject(mBuffer) ||
JS_IsArrayBufferViewObject(mBuffer));
}
virtual ~MapDataIntoBufferSource() = default;
void DoMapDataIntoBufferSource()
{
ErrorResult error;
// Prepare destination buffer.
uint8_t* bufferData = nullptr;
uint32_t bufferLength = 0;
bool isSharedMemory = false;
if (JS_IsArrayBufferObject(mBuffer)) {
js::GetArrayBufferLengthAndData(mBuffer, &bufferLength, &isSharedMemory, &bufferData);
} else if (JS_IsArrayBufferViewObject(mBuffer)) {
js::GetArrayBufferViewLengthAndData(mBuffer, &bufferLength, &isSharedMemory, &bufferData);
} else {
error.Throw(NS_ERROR_NOT_IMPLEMENTED);
mPromise->MaybeReject(error);
return;
}
if (NS_WARN_IF(!bufferData) || NS_WARN_IF(!bufferLength)) {
error.Throw(NS_ERROR_NOT_AVAILABLE);
mPromise->MaybeReject(error);
return;
}
// Check length.
const int32_t neededBufferLength =
mImageBitmap->MappedDataLength(mFormat, error);
if (((int32_t)bufferLength - mOffset) < neededBufferLength) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
mPromise->MaybeReject(error);
return;
}
// Call ImageBitmapFormatUtils.
UniquePtr<ImagePixelLayout> layout =
mImageBitmap->mDataWrapper->MapDataInto(bufferData,
mOffset,
bufferLength,
mFormat,
error);
if (NS_WARN_IF(!layout)) {
mPromise->MaybeReject(error);
return;
}
mPromise->MaybeResolve(*layout);
}
RefPtr<Promise> mPromise;
RefPtr<ImageBitmap> mImageBitmap;
JS::PersistentRooted<JSObject*> mBuffer;
int32_t mOffset;
ImageBitmapFormat mFormat;
};
template<typename T>
class MapDataIntoBufferSourceTask final : public Runnable,
public MapDataIntoBufferSource<T>
{
public:
MapDataIntoBufferSourceTask(JSContext* aCx,
Promise *aPromise,
ImageBitmap *aImageBitmap,
const T& aBuffer,
int32_t aOffset,
ImageBitmapFormat aFormat)
: MapDataIntoBufferSource<T>(aCx, aPromise, aImageBitmap, aBuffer, aOffset, aFormat)
{
}
virtual ~MapDataIntoBufferSourceTask() = default;
NS_IMETHOD Run() override
{
MapDataIntoBufferSource<T>::DoMapDataIntoBufferSource();
return NS_OK;
}
};
template<typename T>
class MapDataIntoBufferSourceWorkerTask final : public WorkerSameThreadRunnable,
public MapDataIntoBufferSource<T>
{
public:
MapDataIntoBufferSourceWorkerTask(JSContext* aCx,
Promise *aPromise,
ImageBitmap *aImageBitmap,
const T& aBuffer,
int32_t aOffset,
ImageBitmapFormat aFormat)
: WorkerSameThreadRunnable(GetCurrentThreadWorkerPrivate()),
MapDataIntoBufferSource<T>(aCx, aPromise, aImageBitmap, aBuffer, aOffset, aFormat)
{
}
virtual ~MapDataIntoBufferSourceWorkerTask() = default;
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
{
MapDataIntoBufferSource<T>::DoMapDataIntoBufferSource();
return true;
}
};
void AsyncMapDataIntoBufferSource(JSContext* aCx,
Promise *aPromise,
ImageBitmap *aImageBitmap,
const ArrayBufferViewOrArrayBuffer& aBuffer,
int32_t aOffset,
ImageBitmapFormat aFormat)
{
MOZ_ASSERT(aCx);
MOZ_ASSERT(aPromise);
MOZ_ASSERT(aImageBitmap);
if (NS_IsMainThread()) {
nsCOMPtr<nsIRunnable> task;
if (aBuffer.IsArrayBuffer()) {
const ArrayBuffer& buffer = aBuffer.GetAsArrayBuffer();
task = new MapDataIntoBufferSourceTask<ArrayBuffer>(aCx, aPromise, aImageBitmap, buffer, aOffset, aFormat);
} else if (aBuffer.IsArrayBufferView()) {
const ArrayBufferView& bufferView = aBuffer.GetAsArrayBufferView();
task = new MapDataIntoBufferSourceTask<ArrayBufferView>(aCx, aPromise, aImageBitmap, bufferView, aOffset, aFormat);
}
NS_DispatchToCurrentThread(task); // Actually, to the main-thread.
} else {
RefPtr<WorkerSameThreadRunnable> task;
if (aBuffer.IsArrayBuffer()) {
const ArrayBuffer& buffer = aBuffer.GetAsArrayBuffer();
task = new MapDataIntoBufferSourceWorkerTask<ArrayBuffer>(aCx, aPromise, aImageBitmap, buffer, aOffset, aFormat);
} else if (aBuffer.IsArrayBufferView()) {
const ArrayBufferView& bufferView = aBuffer.GetAsArrayBufferView();
task = new MapDataIntoBufferSourceWorkerTask<ArrayBufferView>(aCx, aPromise, aImageBitmap, bufferView, aOffset, aFormat);
}
task->Dispatch(); // Actually, to the current worker-thread.
}
}
already_AddRefed<Promise>
ImageBitmap::MapDataInto(JSContext* aCx,
ImageBitmapFormat aFormat,
const ArrayBufferViewOrArrayBuffer& aBuffer,
int32_t aOffset, ErrorResult& aRv)
{
MOZ_ASSERT(mDataWrapper, "No ImageBitmapFormatUtils functionalities.");
MOZ_ASSERT(aCx, "No JSContext while calling ImageBitmap::MapDataInto().");
RefPtr<Promise> promise = Promise::Create(mParent, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
// Check for cases that should throws.
// Case 1:
// If image bitmap was cropped to the source rectangle so that it contains any
// transparent black pixels (cropping area is outside of the source image),
// then reject promise with IndexSizeError and abort these steps.
if (mIsCroppingAreaOutSideOfSourceImage) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return promise.forget();
}
// Case 2:
// If the image bitmap is going to be accessed in YUV422/YUV422 series with a
// cropping area starts at an odd x or y coordinate.
if (aFormat == ImageBitmapFormat::YUV422P ||
aFormat == ImageBitmapFormat::YUV420P ||
aFormat == ImageBitmapFormat::YUV420SP_NV12 ||
aFormat == ImageBitmapFormat::YUV420SP_NV21) {
if ((mPictureRect.x & 1) || (mPictureRect.y & 1)) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return promise.forget();
}
}
AsyncMapDataIntoBufferSource(aCx, promise, this, aBuffer, aOffset, aFormat);
return promise.forget();
}
// ImageBitmapFactories extensions.
static SurfaceFormat
ImageFormatToSurfaceFromat(mozilla::dom::ImageBitmapFormat aFormat)
{
switch(aFormat) {
case ImageBitmapFormat::RGBA32:
return SurfaceFormat::R8G8B8A8;
case ImageBitmapFormat::BGRA32:
return SurfaceFormat::B8G8R8A8;
case ImageBitmapFormat::RGB24:
return SurfaceFormat::R8G8B8;
case ImageBitmapFormat::BGR24:
return SurfaceFormat::B8G8R8;
case ImageBitmapFormat::GRAY8:
return SurfaceFormat::A8;
case ImageBitmapFormat::HSV:
return SurfaceFormat::HSV;
case ImageBitmapFormat::Lab:
return SurfaceFormat::Lab;
case ImageBitmapFormat::DEPTH:
return SurfaceFormat::Depth;
default:
return SurfaceFormat::UNKNOWN;
}
}
static already_AddRefed<layers::Image>
CreateImageFromBufferSourceRawData(const uint8_t*aBufferData,
uint32_t aBufferLength,
mozilla::dom::ImageBitmapFormat aFormat,
const Sequence<ChannelPixelLayout>& aLayout)
{
MOZ_ASSERT(aBufferData);
MOZ_ASSERT(aBufferLength > 0);
switch(aFormat) {
case ImageBitmapFormat::RGBA32:
case ImageBitmapFormat::BGRA32:
case ImageBitmapFormat::RGB24:
case ImageBitmapFormat::BGR24:
case ImageBitmapFormat::GRAY8:
case ImageBitmapFormat::HSV:
case ImageBitmapFormat::Lab:
case ImageBitmapFormat::DEPTH:
{
const nsTArray<ChannelPixelLayout>& channels = aLayout;
MOZ_ASSERT(channels.Length() != 0, "Empty Channels.");
const SurfaceFormat srcFormat = ImageFormatToSurfaceFromat(aFormat);
const uint32_t srcStride = channels[0].mStride;
const IntSize srcSize(channels[0].mWidth, channels[0].mHeight);
RefPtr<DataSourceSurface> dstDataSurface =
Factory::CreateDataSourceSurfaceWithStride(srcSize, srcFormat, srcStride);
if (NS_WARN_IF(!dstDataSurface)) {
return nullptr;
}
// Copy the raw data into the newly created DataSourceSurface.
DataSourceSurface::ScopedMap dstMap(dstDataSurface, DataSourceSurface::WRITE);
if (NS_WARN_IF(!dstMap.IsMapped())) {
return nullptr;
}
const uint8_t* srcBufferPtr = aBufferData;
uint8_t* dstBufferPtr = dstMap.GetData();
for (int i = 0; i < srcSize.height; ++i) {
memcpy(dstBufferPtr, srcBufferPtr, srcStride);
srcBufferPtr += srcStride;
dstBufferPtr += dstMap.GetStride();
}
// Create an Image from the BGRA SourceSurface.
RefPtr<SourceSurface> surface = dstDataSurface;
RefPtr<layers::Image> image = CreateImageFromSurface(surface);
if (NS_WARN_IF(!image)) {
return nullptr;
}
return image.forget();
}
case ImageBitmapFormat::YUV444P:
case ImageBitmapFormat::YUV422P:
case ImageBitmapFormat::YUV420P:
case ImageBitmapFormat::YUV420SP_NV12:
case ImageBitmapFormat::YUV420SP_NV21:
{
// Prepare the PlanarYCbCrData.
const ChannelPixelLayout& yLayout = aLayout[0];
const ChannelPixelLayout& uLayout = aFormat != ImageBitmapFormat::YUV420SP_NV21 ? aLayout[1] : aLayout[2];
const ChannelPixelLayout& vLayout = aFormat != ImageBitmapFormat::YUV420SP_NV21 ? aLayout[2] : aLayout[1];
layers::PlanarYCbCrData data;
// Luminance buffer
data.mYChannel = const_cast<uint8_t*>(aBufferData + yLayout.mOffset);
data.mYStride = yLayout.mStride;
data.mYSize = gfx::IntSize(yLayout.mWidth, yLayout.mHeight);
data.mYSkip = yLayout.mSkip;
// Chroma buffers
data.mCbChannel = const_cast<uint8_t*>(aBufferData + uLayout.mOffset);
data.mCrChannel = const_cast<uint8_t*>(aBufferData + vLayout.mOffset);
data.mCbCrStride = uLayout.mStride;
data.mCbCrSize = gfx::IntSize(uLayout.mWidth, uLayout.mHeight);
data.mCbSkip = uLayout.mSkip;
data.mCrSkip = vLayout.mSkip;
// Picture rectangle.
// We set the picture rectangle to exactly the size of the source image to
// keep the full original data.
data.mPicX = 0;
data.mPicY = 0;
data.mPicSize = data.mYSize;
// Create a layers::Image and set data.
if (aFormat == ImageBitmapFormat::YUV444P ||
aFormat == ImageBitmapFormat::YUV422P ||
aFormat == ImageBitmapFormat::YUV420P) {
RefPtr<layers::PlanarYCbCrImage> image =
new layers::RecyclingPlanarYCbCrImage(new layers::BufferRecycleBin());
if (NS_WARN_IF(!image)) {
return nullptr;
}
// Set Data.
if (NS_WARN_IF(!image->CopyData(data))) {
return nullptr;
}
return image.forget();
} else {
RefPtr<layers::NVImage>image = new layers::NVImage();
if (NS_WARN_IF(!image)) {
return nullptr;
}
// Set Data.
if (NS_WARN_IF(!image->SetData(data))) {
return nullptr;
}
return image.forget();
}
}
default:
return nullptr;
}
}
/*
* This is a synchronous task.
* This class is used to create a layers::CairoImage from raw data in the main
* thread. While creating an ImageBitmap from an BufferSource, we need to create
* a SouceSurface from the BufferSource raw data and then set the SourceSurface
* into a layers::CairoImage. However, the layers::CairoImage asserts the
* setting operation in the main thread, so if we are going to create an
* ImageBitmap from an BufferSource off the main thread, we post an event to the
* main thread to create a layers::CairoImage from an BufferSource raw data.
*
* TODO: Once the layers::CairoImage is constructible off the main thread, which
* means the SouceSurface could be released anywhere, we do not need this
* task anymore.
*/
class CreateImageFromBufferSourceRawDataInMainThreadSyncTask final :
public WorkerMainThreadRunnable
{
public:
CreateImageFromBufferSourceRawDataInMainThreadSyncTask(const uint8_t* aBuffer,
uint32_t aBufferLength,
mozilla::dom::ImageBitmapFormat aFormat,
const Sequence<ChannelPixelLayout>& aLayout,
/*output*/ layers::Image** aImage)
: WorkerMainThreadRunnable(GetCurrentThreadWorkerPrivate(),
NS_LITERAL_CSTRING("ImageBitmap-extensions :: Create Image from BufferSource Raw Data"))
, mImage(aImage)
, mBuffer(aBuffer)
, mBufferLength(aBufferLength)
, mFormat(aFormat)
, mLayout(aLayout)
{
MOZ_ASSERT(!(*aImage), "Don't pass an existing Image into CreateImageFromBufferSourceRawDataInMainThreadSyncTask.");
}
bool MainThreadRun() override
{
RefPtr<layers::Image> image =
CreateImageFromBufferSourceRawData(mBuffer, mBufferLength, mFormat, mLayout);
if (NS_WARN_IF(!image)) {
return true;
}
image.forget(mImage);
return true;
}
private:
layers::Image** mImage;
const uint8_t* mBuffer;
uint32_t mBufferLength;
mozilla::dom::ImageBitmapFormat mFormat;
const Sequence<ChannelPixelLayout>& mLayout;
};
/*static*/ already_AddRefed<Promise>
ImageBitmap::Create(nsIGlobalObject* aGlobal,
const ImageBitmapSource& aBuffer,
int32_t aOffset, int32_t aLength,
mozilla::dom::ImageBitmapFormat aFormat,
const Sequence<ChannelPixelLayout>& aLayout,
ErrorResult& aRv)
{
MOZ_ASSERT(aGlobal);
RefPtr<Promise> promise = Promise::Create(aGlobal, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
uint8_t* bufferData = nullptr;
uint32_t bufferLength = 0;
if (aBuffer.IsArrayBuffer()) {
const ArrayBuffer& buffer = aBuffer.GetAsArrayBuffer();
buffer.ComputeLengthAndData();
bufferData = buffer.Data();
bufferLength = buffer.Length();
} else if (aBuffer.IsArrayBufferView()) {
const ArrayBufferView& bufferView = aBuffer.GetAsArrayBufferView();
bufferView.ComputeLengthAndData();
bufferData = bufferView.Data();
bufferLength = bufferView.Length();
} else {
aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
return promise.forget();
}
MOZ_ASSERT(bufferData && bufferLength > 0, "Cannot read data from BufferSource.");
// Check the buffer.
if (((uint32_t)(aOffset + aLength) > bufferLength)) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return promise.forget();
}
// Create and Crop the raw data into a layers::Image
RefPtr<layers::Image> data;
if (NS_IsMainThread()) {
data = CreateImageFromBufferSourceRawData(bufferData + aOffset, bufferLength,
aFormat, aLayout);
} else {
RefPtr<CreateImageFromBufferSourceRawDataInMainThreadSyncTask> task =
new CreateImageFromBufferSourceRawDataInMainThreadSyncTask(bufferData + aOffset,
bufferLength,
aFormat,
aLayout,
getter_AddRefs(data));
task->Dispatch(aRv);
}
if (NS_WARN_IF(!data)) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return promise.forget();
}
// Create an ImageBimtap.
// Assume the data from an external buffer is not alpha-premultiplied.
RefPtr<ImageBitmap> imageBitmap = new ImageBitmap(aGlobal, data, false);
// We don't need to call SetPictureRect() here because there is no cropping
// supported and the ImageBitmap's mPictureRect is the size of the source
// image in default
// We don't need to set mIsCroppingAreaOutSideOfSourceImage here because there
// is no cropping supported and the mIsCroppingAreaOutSideOfSourceImage is
// false in default.
AsyncFulfillImageBitmapPromise(promise, imageBitmap);
return promise.forget();
}
} // namespace dom
} // namespace mozilla
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