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132 lines
5.4 KiB
C
132 lines
5.4 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef ImageEncoder_h
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#define ImageEncoder_h
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#include "imgIEncoder.h"
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#include "nsError.h"
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#include "mozilla/dom/File.h"
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#include "mozilla/dom/HTMLCanvasElementBinding.h"
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#include "mozilla/UniquePtr.h"
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#include "nsLayoutUtils.h"
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#include "nsSize.h"
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class nsICanvasRenderingContextInternal;
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namespace mozilla {
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namespace layers {
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class AsyncCanvasRenderer;
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class Image;
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} // namespace layers
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namespace dom {
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class EncodeCompleteCallback;
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class EncodingRunnable;
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class ImageEncoder
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{
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public:
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// Extracts data synchronously and gives you a stream containing the image
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// represented by aContext. aType may change to "image/png" if we had to fall
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// back to a PNG encoder. A return value of NS_OK implies successful data
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// extraction. If there are any unrecognized custom parse options in
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// aOptions, NS_ERROR_INVALID_ARG will be returned. When encountering this
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// error it is usual to call this function again without any options at all.
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static nsresult ExtractData(nsAString& aType,
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const nsAString& aOptions,
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const nsIntSize aSize,
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nsICanvasRenderingContextInternal* aContext,
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layers::AsyncCanvasRenderer* aRenderer,
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nsIInputStream** aStream);
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// Extracts data asynchronously. aType may change to "image/png" if we had to
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// fall back to a PNG encoder. aOptions are the options to be passed to the
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// encoder and aUsingCustomOptions specifies whether custom parse options were
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// used (i.e. by using -moz-parse-options). If there are any unrecognized
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// custom parse options, we fall back to the default values for the encoder
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// without any options at all. A return value of NS_OK only implies
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// successful dispatching of the extraction step to the encoding thread.
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// aEncodeCallback will be called on main thread when encoding process is
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// success.
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// Note: The callback has to set a valid parent for content for the generated
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// Blob object.
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static nsresult ExtractDataAsync(nsAString& aType,
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const nsAString& aOptions,
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bool aUsingCustomOptions,
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UniquePtr<uint8_t[]> aImageBuffer,
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int32_t aFormat,
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const nsIntSize aSize,
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EncodeCompleteCallback* aEncodeCallback);
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// Extract an Image asynchronously. Its function is same as ExtractDataAsync
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// except for the parameters. aImage is the uncompressed data. aEncodeCallback
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// will be called on main thread when encoding process is success.
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// Note: The callback has to set a valid parent for content for the generated
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// Blob object.
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static nsresult ExtractDataFromLayersImageAsync(nsAString& aType,
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const nsAString& aOptions,
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bool aUsingCustomOptions,
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layers::Image* aImage,
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EncodeCompleteCallback* aEncodeCallback);
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// Gives you a stream containing the image represented by aImageBuffer.
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// The format is given in aFormat, for example
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// imgIEncoder::INPUT_FORMAT_HOSTARGB.
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static nsresult GetInputStream(int32_t aWidth,
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int32_t aHeight,
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uint8_t* aImageBuffer,
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int32_t aFormat,
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imgIEncoder* aEncoder,
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const char16_t* aEncoderOptions,
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nsIInputStream** aStream);
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private:
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// When called asynchronously, aContext and aRenderer are null.
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static nsresult
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ExtractDataInternal(const nsAString& aType,
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const nsAString& aOptions,
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uint8_t* aImageBuffer,
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int32_t aFormat,
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const nsIntSize aSize,
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layers::Image* aImage,
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nsICanvasRenderingContextInternal* aContext,
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layers::AsyncCanvasRenderer* aRenderer,
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nsIInputStream** aStream,
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imgIEncoder* aEncoder);
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// Creates and returns an encoder instance of the type specified in aType.
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// aType may change to "image/png" if no instance of the original type could
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// be created and we had to fall back to a PNG encoder. A null return value
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// should be interpreted as NS_IMAGELIB_ERROR_NO_ENCODER and aType is
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// undefined in this case.
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static already_AddRefed<imgIEncoder> GetImageEncoder(nsAString& aType);
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friend class EncodingRunnable;
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};
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/**
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* The callback interface of ExtractDataAsync and ExtractDataFromLayersImageAsync.
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* ReceiveBlob() is called on main thread when encoding is complete.
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*/
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class EncodeCompleteCallback
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{
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(EncodeCompleteCallback)
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virtual nsresult ReceiveBlob(already_AddRefed<Blob> aBlob) = 0;
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protected:
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virtual ~EncodeCompleteCallback() {}
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};
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} // namespace dom
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} // namespace mozilla
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#endif // ImageEncoder_h
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