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-rw-r--r--dom/base/ImageEncoder.cpp454
1 files changed, 454 insertions, 0 deletions
diff --git a/dom/base/ImageEncoder.cpp b/dom/base/ImageEncoder.cpp
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+++ b/dom/base/ImageEncoder.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "ImageEncoder.h"
+#include "mozilla/dom/CanvasRenderingContext2D.h"
+#include "mozilla/dom/GeneratePlaceholderCanvasData.h"
+#include "mozilla/dom/MemoryBlobImpl.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/DataSurfaceHelpers.h"
+#include "mozilla/layers/CanvasRenderer.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/Unused.h"
+#include "gfxUtils.h"
+#include "nsComponentManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "nsNetUtil.h"
+#include "nsXPCOMCIDInternal.h"
+#include "YCbCrUtils.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla::dom {
+
+// This class should be placed inside GetBRGADataSourceSurfaceSync(). However,
+// due to B2G ICS uses old complier (C++98/03) which forbids local class as
+// template parameter, we need to move this class outside.
+class SurfaceHelper : public Runnable {
+ public:
+ explicit SurfaceHelper(already_AddRefed<layers::Image> aImage)
+ : Runnable("SurfaceHelper"), mImage(aImage) {}
+
+ // It retrieves a SourceSurface reference and convert color format on main
+ // thread and passes DataSourceSurface to caller thread.
+ NS_IMETHOD Run() override {
+ RefPtr<gfx::SourceSurface> surface = mImage->GetAsSourceSurface();
+
+ if (surface->GetFormat() == gfx::SurfaceFormat::B8G8R8A8) {
+ mDataSourceSurface = surface->GetDataSurface();
+ } else {
+ mDataSourceSurface = gfxUtils::CopySurfaceToDataSourceSurfaceWithFormat(
+ surface, gfx::SurfaceFormat::B8G8R8A8);
+ }
+
+ // It guarantees the reference will be released on main thread.
+ NS_ReleaseOnMainThread("SurfaceHelper::surface", surface.forget());
+ return NS_OK;
+ }
+
+ already_AddRefed<gfx::DataSourceSurface> GetDataSurfaceSafe() {
+ nsCOMPtr<nsIEventTarget> mainTarget = GetMainThreadSerialEventTarget();
+ MOZ_ASSERT(mainTarget);
+ SyncRunnable::DispatchToThread(mainTarget, this, false);
+
+ return mDataSourceSurface.forget();
+ }
+
+ private:
+ RefPtr<layers::Image> mImage;
+ RefPtr<gfx::DataSourceSurface> mDataSourceSurface;
+};
+
+// This function returns a DataSourceSurface in B8G8R8A8 format.
+// It uses SourceSurface to do format convert. Because most SourceSurface in
+// image formats should be referenced or dereferenced on main thread, it uses a
+// sync class SurfaceHelper to retrieve SourceSurface and convert to B8G8R8A8 on
+// main thread.
+already_AddRefed<DataSourceSurface> GetBRGADataSourceSurfaceSync(
+ already_AddRefed<layers::Image> aImage) {
+ RefPtr<SurfaceHelper> helper = new SurfaceHelper(std::move(aImage));
+ return helper->GetDataSurfaceSafe();
+}
+
+class EncodingCompleteEvent final : public DiscardableRunnable {
+ virtual ~EncodingCompleteEvent() = default;
+
+ public:
+ explicit EncodingCompleteEvent(
+ EncodeCompleteCallback* aEncodeCompleteCallback)
+ : DiscardableRunnable("EncodingCompleteEvent"),
+ mImgSize(0),
+ mType(),
+ mImgData(nullptr),
+ mEncodeCompleteCallback(aEncodeCompleteCallback),
+ mFailed(false) {
+ if (!NS_IsMainThread() && IsCurrentThreadRunningWorker()) {
+ mCreationEventTarget = GetCurrentSerialEventTarget();
+ } else {
+ mCreationEventTarget = GetMainThreadSerialEventTarget();
+ }
+ }
+
+ // MOZ_CAN_RUN_SCRIPT_BOUNDARY until Runnable::Run is MOZ_CAN_RUN_SCRIPT. See
+ // bug 1535398.
+ MOZ_CAN_RUN_SCRIPT_BOUNDARY
+ NS_IMETHOD Run() override {
+ nsresult rv = NS_OK;
+
+ // We want to null out mEncodeCompleteCallback no matter what.
+ RefPtr<EncodeCompleteCallback> callback(std::move(mEncodeCompleteCallback));
+ if (!mFailed) {
+ RefPtr<BlobImpl> blobImpl = new MemoryBlobImpl(mImgData, mImgSize, mType);
+ rv = callback->ReceiveBlobImpl(blobImpl.forget());
+ } else {
+ rv = callback->ReceiveBlobImpl(nullptr);
+ }
+
+ return rv;
+ }
+
+ void SetMembers(void* aImgData, uint64_t aImgSize,
+ const nsAutoString& aType) {
+ mImgData = aImgData;
+ mImgSize = aImgSize;
+ mType = aType;
+ }
+
+ void SetFailed() { mFailed = true; }
+
+ nsIEventTarget* GetCreationThreadEventTarget() {
+ return mCreationEventTarget;
+ }
+
+ bool CanBeDeletedOnAnyThread() {
+ return !mEncodeCompleteCallback ||
+ mEncodeCompleteCallback->CanBeDeletedOnAnyThread();
+ }
+
+ private:
+ uint64_t mImgSize;
+ nsAutoString mType;
+ void* mImgData;
+ nsCOMPtr<nsIEventTarget> mCreationEventTarget;
+ RefPtr<EncodeCompleteCallback> mEncodeCompleteCallback;
+ bool mFailed;
+};
+
+class EncodingRunnable : public Runnable {
+ virtual ~EncodingRunnable() = default;
+
+ public:
+ NS_INLINE_DECL_REFCOUNTING_INHERITED(EncodingRunnable, Runnable)
+
+ EncodingRunnable(const nsAString& aType, const nsAString& aOptions,
+ UniquePtr<uint8_t[]> aImageBuffer, layers::Image* aImage,
+ imgIEncoder* aEncoder,
+ EncodingCompleteEvent* aEncodingCompleteEvent,
+ int32_t aFormat, const nsIntSize aSize, bool aUsePlaceholder,
+ bool aUsingCustomOptions)
+ : Runnable("EncodingRunnable"),
+ mType(aType),
+ mOptions(aOptions),
+ mImageBuffer(std::move(aImageBuffer)),
+ mImage(aImage),
+ mEncoder(aEncoder),
+ mEncodingCompleteEvent(aEncodingCompleteEvent),
+ mFormat(aFormat),
+ mSize(aSize),
+ mUsePlaceholder(aUsePlaceholder),
+ mUsingCustomOptions(aUsingCustomOptions) {}
+
+ nsresult ProcessImageData(uint64_t* aImgSize, void** aImgData) {
+ nsCOMPtr<nsIInputStream> stream;
+ nsresult rv = ImageEncoder::ExtractDataInternal(
+ mType, mOptions, mImageBuffer.get(), mFormat, mSize, mUsePlaceholder,
+ mImage, nullptr, nullptr, getter_AddRefs(stream), mEncoder);
+
+ // If there are unrecognized custom parse options, we should fall back to
+ // the default values for the encoder without any options at all.
+ if (rv == NS_ERROR_INVALID_ARG && mUsingCustomOptions) {
+ rv = ImageEncoder::ExtractDataInternal(
+ mType, u""_ns, mImageBuffer.get(), mFormat, mSize, mUsePlaceholder,
+ mImage, nullptr, nullptr, getter_AddRefs(stream), mEncoder);
+ }
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = NS_ReadInputStreamToBuffer(stream, aImgData, -1, aImgSize);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ return rv;
+ }
+
+ NS_IMETHOD Run() override {
+ uint64_t imgSize;
+ void* imgData = nullptr;
+
+ nsresult rv = ProcessImageData(&imgSize, &imgData);
+ if (NS_FAILED(rv)) {
+ mEncodingCompleteEvent->SetFailed();
+ } else {
+ mEncodingCompleteEvent->SetMembers(imgData, imgSize, mType);
+ }
+ rv = mEncodingCompleteEvent->GetCreationThreadEventTarget()->Dispatch(
+ mEncodingCompleteEvent, nsIThread::DISPATCH_NORMAL);
+ if (NS_FAILED(rv)) {
+ if (!mEncodingCompleteEvent->CanBeDeletedOnAnyThread()) {
+ // Better to leak than to crash.
+ Unused << mEncodingCompleteEvent.forget();
+ }
+ return rv;
+ }
+
+ return rv;
+ }
+
+ private:
+ nsAutoString mType;
+ nsAutoString mOptions;
+ UniquePtr<uint8_t[]> mImageBuffer;
+ RefPtr<layers::Image> mImage;
+ nsCOMPtr<imgIEncoder> mEncoder;
+ RefPtr<EncodingCompleteEvent> mEncodingCompleteEvent;
+ int32_t mFormat;
+ const nsIntSize mSize;
+ bool mUsePlaceholder;
+ bool mUsingCustomOptions;
+};
+
+/* static */
+nsresult ImageEncoder::ExtractData(nsAString& aType, const nsAString& aOptions,
+ const nsIntSize aSize, bool aUsePlaceholder,
+ nsICanvasRenderingContextInternal* aContext,
+ layers::CanvasRenderer* aRenderer,
+ nsIInputStream** aStream) {
+ nsCOMPtr<imgIEncoder> encoder = ImageEncoder::GetImageEncoder(aType);
+ if (!encoder) {
+ return NS_IMAGELIB_ERROR_NO_ENCODER;
+ }
+
+ return ExtractDataInternal(aType, aOptions, nullptr, 0, aSize,
+ aUsePlaceholder, nullptr, aContext, aRenderer,
+ aStream, encoder);
+}
+
+/* static */
+nsresult ImageEncoder::ExtractDataFromLayersImageAsync(
+ nsAString& aType, const nsAString& aOptions, bool aUsingCustomOptions,
+ layers::Image* aImage, bool aUsePlaceholder,
+ EncodeCompleteCallback* aEncodeCallback) {
+ nsCOMPtr<imgIEncoder> encoder = ImageEncoder::GetImageEncoder(aType);
+ if (!encoder) {
+ return NS_IMAGELIB_ERROR_NO_ENCODER;
+ }
+
+ RefPtr<EncodingCompleteEvent> completeEvent =
+ new EncodingCompleteEvent(aEncodeCallback);
+
+ nsIntSize size(aImage->GetSize().width, aImage->GetSize().height);
+ nsCOMPtr<nsIRunnable> event =
+ new EncodingRunnable(aType, aOptions, nullptr, aImage, encoder,
+ completeEvent, imgIEncoder::INPUT_FORMAT_HOSTARGB,
+ size, aUsePlaceholder, aUsingCustomOptions);
+ return NS_DispatchBackgroundTask(event.forget());
+}
+
+/* static */
+nsresult ImageEncoder::ExtractDataAsync(
+ nsAString& aType, const nsAString& aOptions, bool aUsingCustomOptions,
+ UniquePtr<uint8_t[]> aImageBuffer, int32_t aFormat, const nsIntSize aSize,
+ bool aUsePlaceholder, EncodeCompleteCallback* aEncodeCallback) {
+ nsCOMPtr<imgIEncoder> encoder = ImageEncoder::GetImageEncoder(aType);
+ if (!encoder) {
+ return NS_IMAGELIB_ERROR_NO_ENCODER;
+ }
+
+ RefPtr<EncodingCompleteEvent> completeEvent =
+ new EncodingCompleteEvent(aEncodeCallback);
+
+ nsCOMPtr<nsIRunnable> event = new EncodingRunnable(
+ aType, aOptions, std::move(aImageBuffer), nullptr, encoder, completeEvent,
+ aFormat, aSize, aUsePlaceholder, aUsingCustomOptions);
+ return NS_DispatchBackgroundTask(event.forget());
+}
+
+/*static*/
+nsresult ImageEncoder::GetInputStream(int32_t aWidth, int32_t aHeight,
+ uint8_t* aImageBuffer, int32_t aFormat,
+ imgIEncoder* aEncoder,
+ const nsAString& aEncoderOptions,
+ nsIInputStream** aStream) {
+ nsresult rv =
+ aEncoder->InitFromData(aImageBuffer, aWidth * aHeight * 4, aWidth,
+ aHeight, aWidth * 4, aFormat, aEncoderOptions);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<imgIEncoder> encoder(aEncoder);
+ encoder.forget(aStream);
+ return NS_OK;
+}
+
+/* static */
+nsresult ImageEncoder::ExtractDataInternal(
+ const nsAString& aType, const nsAString& aOptions, uint8_t* aImageBuffer,
+ int32_t aFormat, const nsIntSize aSize, bool aUsePlaceholder,
+ layers::Image* aImage, nsICanvasRenderingContextInternal* aContext,
+ layers::CanvasRenderer* aRenderer, nsIInputStream** aStream,
+ imgIEncoder* aEncoder) {
+ if (aSize.IsEmpty()) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ nsCOMPtr<nsIInputStream> imgStream;
+
+ // get image bytes
+ nsresult rv;
+ if (aImageBuffer && !aUsePlaceholder) {
+ if (BufferSizeFromDimensions(aSize.width, aSize.height, 4) == 0) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ rv = ImageEncoder::GetInputStream(aSize.width, aSize.height, aImageBuffer,
+ aFormat, aEncoder, aOptions,
+ getter_AddRefs(imgStream));
+ } else if (aContext && !aUsePlaceholder) {
+ NS_ConvertUTF16toUTF8 encoderType(aType);
+ rv = aContext->GetInputStream(encoderType.get(), aOptions,
+ getter_AddRefs(imgStream));
+ } else if (aRenderer && !aUsePlaceholder) {
+ MOZ_CRASH("unused?");
+ const NS_ConvertUTF16toUTF8 encoderType(aType);
+ if (BufferSizeFromDimensions(aSize.width, aSize.height, 4) == 0) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ const auto snapshot = aRenderer->BorrowSnapshot();
+ if (!snapshot) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ const RefPtr<DataSourceSurface> data = snapshot->mSurf->GetDataSurface();
+ if (!data) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ {
+ DataSourceSurface::MappedSurface map;
+ if (!data->Map(gfx::DataSourceSurface::MapType::READ, &map)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+ rv = aEncoder->InitFromData(map.mData, aSize.width * aSize.height * 4,
+ aSize.width, aSize.height, aSize.width * 4,
+ imgIEncoder::INPUT_FORMAT_HOSTARGB, aOptions);
+ data->Unmap();
+ }
+ } else if (aImage && !aUsePlaceholder) {
+ // It is safe to convert PlanarYCbCr format from YUV to RGB off-main-thread.
+ // Other image formats could have problem to convert format off-main-thread.
+ // So here it uses a help function GetBRGADataSourceSurfaceSync() to convert
+ // format on main thread.
+ if (aImage->GetFormat() == ImageFormat::PLANAR_YCBCR) {
+ nsTArray<uint8_t> data;
+ layers::PlanarYCbCrImage* ycbcrImage =
+ static_cast<layers::PlanarYCbCrImage*>(aImage);
+ gfxImageFormat format = SurfaceFormat::A8R8G8B8_UINT32;
+ uint32_t stride = GetAlignedStride<16>(aSize.width, 4);
+ size_t length = BufferSizeFromStrideAndHeight(stride, aSize.height);
+ if (length == 0) {
+ return NS_ERROR_INVALID_ARG;
+ }
+ data.SetCapacity(length);
+
+ ConvertYCbCrToRGB(*ycbcrImage->GetData(), format, aSize, data.Elements(),
+ stride);
+
+ rv = aEncoder->InitFromData(data.Elements(),
+ aSize.width * aSize.height * 4, aSize.width,
+ aSize.height, aSize.width * 4,
+ imgIEncoder::INPUT_FORMAT_HOSTARGB, aOptions);
+ } else {
+ if (BufferSizeFromDimensions(aSize.width, aSize.height, 4) == 0) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ RefPtr<gfx::DataSourceSurface> dataSurface;
+ RefPtr<layers::Image> image(aImage);
+ dataSurface = GetBRGADataSourceSurfaceSync(image.forget());
+
+ DataSourceSurface::MappedSurface map;
+ if (!dataSurface->Map(gfx::DataSourceSurface::MapType::READ, &map)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+ rv = aEncoder->InitFromData(map.mData, aSize.width * aSize.height * 4,
+ aSize.width, aSize.height, aSize.width * 4,
+ imgIEncoder::INPUT_FORMAT_HOSTARGB, aOptions);
+ dataSurface->Unmap();
+ }
+
+ if (NS_SUCCEEDED(rv)) {
+ imgStream = aEncoder;
+ }
+ } else {
+ if (BufferSizeFromDimensions(aSize.width, aSize.height, 4) == 0) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ // no context, so we have to encode an empty image
+ // note that if we didn't have a current context, the spec says we're
+ // supposed to just return transparent black pixels of the canvas
+ // dimensions.
+ RefPtr<DataSourceSurface> emptyCanvas =
+ Factory::CreateDataSourceSurfaceWithStride(
+ IntSize(aSize.width, aSize.height), SurfaceFormat::B8G8R8A8,
+ 4 * aSize.width, true);
+ if (NS_WARN_IF(!emptyCanvas)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ DataSourceSurface::MappedSurface map;
+ if (!emptyCanvas->Map(DataSourceSurface::MapType::WRITE, &map)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+ if (aUsePlaceholder) {
+ auto size = 4 * aSize.width * aSize.height;
+ auto* data = map.mData;
+ GeneratePlaceholderCanvasData(size, data);
+ }
+ rv = aEncoder->InitFromData(map.mData, aSize.width * aSize.height * 4,
+ aSize.width, aSize.height, aSize.width * 4,
+ imgIEncoder::INPUT_FORMAT_HOSTARGB, aOptions);
+ emptyCanvas->Unmap();
+ if (NS_SUCCEEDED(rv)) {
+ imgStream = aEncoder;
+ }
+ }
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ imgStream.forget(aStream);
+ return rv;
+}
+
+/* static */
+already_AddRefed<imgIEncoder> ImageEncoder::GetImageEncoder(nsAString& aType) {
+ // Get an image encoder for the media type.
+ nsCString encoderCID("@mozilla.org/image/encoder;2?type=");
+ NS_ConvertUTF16toUTF8 encoderType(aType);
+ encoderCID += encoderType;
+ nsCOMPtr<imgIEncoder> encoder = do_CreateInstance(encoderCID.get());
+
+ if (!encoder && aType != u"image/png"_ns) {
+ // Unable to create an encoder instance of the specified type. Falling back
+ // to PNG.
+ aType.AssignLiteral("image/png");
+ nsCString PNGEncoderCID("@mozilla.org/image/encoder;2?type=image/png");
+ encoder = do_CreateInstance(PNGEncoderCID.get());
+ }
+
+ return encoder.forget();
+}
+
+} // namespace mozilla::dom