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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/canvas/ImageBitmap.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/canvas/ImageBitmap.h')
-rw-r--r--dom/canvas/ImageBitmap.h274
1 files changed, 274 insertions, 0 deletions
diff --git a/dom/canvas/ImageBitmap.h b/dom/canvas/ImageBitmap.h
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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/. */
+
+#ifndef mozilla_dom_ImageBitmap_h
+#define mozilla_dom_ImageBitmap_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/ImageBitmapBinding.h"
+#include "mozilla/dom/ImageBitmapSource.h"
+#include "mozilla/dom/TypedArray.h"
+#include "mozilla/gfx/Rect.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/UniquePtr.h"
+#include "ImageData.h"
+#include "gfxTypes.h" // for gfxAlphaType
+#include "nsCycleCollectionParticipant.h"
+
+struct JSContext;
+struct JSStructuredCloneReader;
+struct JSStructuredCloneWriter;
+
+class nsIGlobalObject;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace gfx {
+class DataSourceSurface;
+class DrawTarget;
+class SourceSurface;
+} // namespace gfx
+
+namespace layers {
+class Image;
+}
+
+namespace dom {
+class OffscreenCanvas;
+
+class ArrayBufferViewOrArrayBuffer;
+class CanvasRenderingContext2D;
+class CreateImageBitmapFromBlob;
+class CreateImageBitmapFromBlobTask;
+class CreateImageBitmapFromBlobWorkerTask;
+class File;
+class HTMLCanvasElement;
+class HTMLImageElement;
+class HTMLVideoElement;
+class ImageBitmapShutdownObserver;
+class ImageData;
+class ImageUtils;
+class Promise;
+class PostMessageEvent; // For StructuredClone between windows.
+class SVGImageElement;
+
+struct ImageBitmapCloneData final {
+ RefPtr<gfx::DataSourceSurface> mSurface;
+ gfx::IntRect mPictureRect;
+ gfxAlphaType mAlphaType;
+ bool mWriteOnly;
+};
+
+/*
+ * ImageBitmap is an opaque handler to several kinds of image-like objects from
+ * HTMLImageElement, HTMLVideoElement, HTMLCanvasElement, ImageData to
+ * CanvasRenderingContext2D and Image Blob.
+ *
+ * An ImageBitmap could be painted to a canvas element.
+ *
+ * Generally, an ImageBitmap only keeps a reference to its source object's
+ * buffer, but if the source object is an ImageData, an Blob or a
+ * HTMLCanvasElement with WebGL rendering context, the ImageBitmap copy the
+ * source object's buffer.
+ */
+class ImageBitmap final : public nsISupports, public nsWrapperCache {
+ public:
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(ImageBitmap)
+
+ nsCOMPtr<nsIGlobalObject> GetParentObject() const { return mParent; }
+
+ virtual JSObject* WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) override;
+
+ uint32_t Width() const { return mPictureRect.Width(); }
+
+ uint32_t Height() const { return mPictureRect.Height(); }
+
+ void Close();
+
+ /*
+ * The PrepareForDrawTarget() might return null if the mPictureRect does not
+ * intersect with the size of mData.
+ */
+ already_AddRefed<gfx::SourceSurface> PrepareForDrawTarget(
+ gfx::DrawTarget* aTarget);
+
+ /*
+ * Transfer ownership of buffer to caller. So this function call
+ * Close() implicitly.
+ */
+ already_AddRefed<layers::Image> TransferAsImage();
+
+ // This method returns null if the image has been already closed.
+ UniquePtr<ImageBitmapCloneData> ToCloneData() const;
+
+ static already_AddRefed<ImageBitmap> CreateFromSourceSurface(
+ nsIGlobalObject* aGlobal, gfx::SourceSurface* aSource, ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateFromCloneData(
+ nsIGlobalObject* aGlobal, ImageBitmapCloneData* aData);
+
+ static already_AddRefed<ImageBitmap> CreateFromOffscreenCanvas(
+ nsIGlobalObject* aGlobal, OffscreenCanvas& aOffscreenCanvas,
+ ErrorResult& aRv);
+
+ static already_AddRefed<Promise> Create(nsIGlobalObject* aGlobal,
+ const ImageBitmapSource& aSrc,
+ const Maybe<gfx::IntRect>& aCropRect,
+ const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static JSObject* ReadStructuredClone(
+ JSContext* aCx, JSStructuredCloneReader* aReader,
+ nsIGlobalObject* aParent,
+ const nsTArray<RefPtr<gfx::DataSourceSurface>>& aClonedSurfaces,
+ uint32_t aIndex);
+
+ static void WriteStructuredClone(
+ JSStructuredCloneWriter* aWriter,
+ nsTArray<RefPtr<gfx::DataSourceSurface>>& aClonedSurfaces,
+ ImageBitmap* aImageBitmap, ErrorResult& aRv);
+
+ friend CreateImageBitmapFromBlob;
+ friend CreateImageBitmapFromBlobTask;
+ friend CreateImageBitmapFromBlobWorkerTask;
+
+ size_t GetAllocatedSize() const;
+
+ void OnShutdown();
+
+ bool IsWriteOnly() const { return mWriteOnly; }
+ bool IsClosed() const { return !mData; };
+
+ protected:
+ /*
+ * The default value of aIsPremultipliedAlpha is TRUE because that the
+ * data stored in HTMLImageElement, HTMLVideoElement, HTMLCanvasElement,
+ * CanvasRenderingContext2D are alpha-premultiplied in default.
+ *
+ * Actually, if one HTMLCanvasElement's rendering context is WebGLContext, it
+ * is possible to get un-premultipliedAlpha data out. But, we do not do it in
+ * the CreateInternal(from HTMLCanvasElement) method.
+ *
+ * It is also possible to decode an image which is encoded with alpha channel
+ * to be non-premultipliedAlpha. This could be applied in
+ * 1) the CreateInternal(from HTMLImageElement) method (which might trigger
+ * re-decoding if the original decoded data is alpha-premultiplied) and
+ * 2) while decoding a blob. But we do not do it in both code path too.
+ *
+ * ImageData's underlying data is triggered as non-premultipliedAlpha, so set
+ * the aIsPremultipliedAlpha to be false in the
+ * CreateInternal(from ImageData) method.
+ */
+ ImageBitmap(nsIGlobalObject* aGlobal, layers::Image* aData, bool aWriteOnly,
+ gfxAlphaType aAlphaType = gfxAlphaType::Premult);
+
+ virtual ~ImageBitmap();
+
+ void SetPictureRect(const gfx::IntRect& aRect, ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateImageBitmapInternal(
+ nsIGlobalObject* aGlobal, gfx::SourceSurface* aSurface,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ const bool aWriteOnly, const bool aAllocatedImageData,
+ const bool aMustCopy, const gfxAlphaType aAlphaType, ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, HTMLImageElement& aImageEl,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, SVGImageElement& aImageEl,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, HTMLVideoElement& aVideoEl,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, HTMLCanvasElement& aCanvasEl,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, OffscreenCanvas& aOffscreenCanvas,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, ImageData& aImageData,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, CanvasRenderingContext2D& aCanvasCtx,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ static already_AddRefed<ImageBitmap> CreateInternal(
+ nsIGlobalObject* aGlobal, ImageBitmap& aImageBitmap,
+ const Maybe<gfx::IntRect>& aCropRect, const ImageBitmapOptions& aOptions,
+ ErrorResult& aRv);
+
+ nsCOMPtr<nsIGlobalObject> mParent;
+
+ /*
+ * The mData is the data buffer of an ImageBitmap, so the mData must not be
+ * null.
+ *
+ * The mSurface is a cache for drawing the ImageBitmap onto a
+ * HTMLCanvasElement. The mSurface is null while the ImageBitmap is created
+ * and then will be initialized while the PrepareForDrawTarget() method is
+ * called first time.
+ *
+ * The mSurface might just be a reference to the same data buffer of the mData
+ * if the are of mPictureRect is just the same as the mData's size. Or, it is
+ * a independent data buffer which is copied and cropped form the mData's data
+ * buffer.
+ */
+ RefPtr<layers::Image> mData;
+ RefPtr<gfx::SourceSurface> mSurface;
+
+ /*
+ * The mPictureRect is the size of the source image in default, however, if
+ * users specify the cropping area while creating an ImageBitmap, then this
+ * mPictureRect is the cropping area.
+ *
+ * Note that if the CreateInternal() copies and crops data from the source
+ * image, then this mPictureRect is just the size of the final mData.
+ *
+ * The mPictureRect will be used at PrepareForDrawTarget() while user is going
+ * to draw this ImageBitmap into a HTMLCanvasElement.
+ */
+ gfx::IntRect mPictureRect;
+
+ gfxAlphaType mAlphaType;
+
+ RefPtr<ImageBitmapShutdownObserver> mShutdownObserver;
+
+ /*
+ * Whether this object allocated allocated and owns the image data.
+ */
+ bool mAllocatedImageData;
+
+ /*
+ * Write-Only flag is set to true if this image has been generated from a
+ * cross-origin source. This is the opposite of what is called 'origin-clean'
+ * in the spec.
+ */
+ bool mWriteOnly;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_ImageBitmap_h