content/canvas/src/ImageEncoder.h@6474c204b198 (annotated)
content/canvas/src/ImageEncoder.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef ImageEncoder_h |
| michael@0 | 7 | #define ImageEncoder_h |
| michael@0 | 8 | |
| michael@0 | 9 | #include "imgIEncoder.h" |
| michael@0 | 10 | #include "nsDOMFile.h" |
| michael@0 | 11 | #include "nsError.h" |
| michael@0 | 12 | #include "mozilla/dom/HTMLCanvasElementBinding.h" |
| michael@0 | 13 | #include "nsLayoutUtils.h" |
| michael@0 | 14 | #include "nsNetUtil.h" |
| michael@0 | 15 | #include "nsSize.h" |
| michael@0 | 16 | |
| michael@0 | 17 | class nsICanvasRenderingContextInternal; |
| michael@0 | 18 | |
| michael@0 | 19 | namespace mozilla { |
| michael@0 | 20 | namespace dom { |
| michael@0 | 21 | |
| michael@0 | 22 | class EncodingRunnable; |
| michael@0 | 23 | |
| michael@0 | 24 | class ImageEncoder |
| michael@0 | 25 | { |
| michael@0 | 26 | public: |
| michael@0 | 27 | // Extracts data synchronously and gives you a stream containing the image |
| michael@0 | 28 | // represented by aContext. aType may change to "image/png" if we had to fall |
| michael@0 | 29 | // back to a PNG encoder. A return value of NS_OK implies successful data |
| michael@0 | 30 | // extraction. If there are any unrecognized custom parse options in |
| michael@0 | 31 | // aOptions, NS_ERROR_INVALID_ARG will be returned. When encountering this |
| michael@0 | 32 | // error it is usual to call this function again without any options at all. |
| michael@0 | 33 | static nsresult ExtractData(nsAString& aType, |
| michael@0 | 34 | const nsAString& aOptions, |
| michael@0 | 35 | const nsIntSize aSize, |
| michael@0 | 36 | bool aUsePlaceholder, |
| michael@0 | 37 | nsICanvasRenderingContextInternal* aContext, |
| michael@0 | 38 | nsIInputStream** aStream); |
| michael@0 | 39 | |
| michael@0 | 40 | // Extracts data asynchronously. aType may change to "image/png" if we had to |
| michael@0 | 41 | // fall back to a PNG encoder. aOptions are the options to be passed to the |
| michael@0 | 42 | // encoder and aUsingCustomOptions specifies whether custom parse options were |
| michael@0 | 43 | // used (i.e. by using -moz-parse-options). If there are any unrecognized |
| michael@0 | 44 | // custom parse options, we fall back to the default values for the encoder |
| michael@0 | 45 | // without any options at all. A return value of NS_OK only implies |
| michael@0 | 46 | // successful dispatching of the extraction step to the encoding thread. |
| michael@0 | 47 | static nsresult ExtractDataAsync(nsAString& aType, |
| michael@0 | 48 | const nsAString& aOptions, |
| michael@0 | 49 | bool aUsingCustomOptions, |
| michael@0 | 50 | uint8_t* aImageBuffer, |
| michael@0 | 51 | int32_t aFormat, |
| michael@0 | 52 | const nsIntSize aSize, |
| michael@0 | 53 | bool aUsePlaceholder, |
| michael@0 | 54 | nsICanvasRenderingContextInternal* aContext, |
| michael@0 | 55 | nsIScriptContext* aScriptContext, |
| michael@0 | 56 | FileCallback& aCallback); |
| michael@0 | 57 | |
| michael@0 | 58 | // Gives you a stream containing the image represented by aImageBuffer. |
| michael@0 | 59 | // The format is given in aFormat, for example |
| michael@0 | 60 | // imgIEncoder::INPUT_FORMAT_HOSTARGB. |
| michael@0 | 61 | static nsresult GetInputStream(int32_t aWidth, |
| michael@0 | 62 | int32_t aHeight, |
| michael@0 | 63 | uint8_t* aImageBuffer, |
| michael@0 | 64 | int32_t aFormat, |
| michael@0 | 65 | imgIEncoder* aEncoder, |
| michael@0 | 66 | const char16_t* aEncoderOptions, |
| michael@0 | 67 | nsIInputStream** aStream); |
| michael@0 | 68 | |
| michael@0 | 69 | private: |
| michael@0 | 70 | // When called asynchronously, aContext is null. |
| michael@0 | 71 | static nsresult |
| michael@0 | 72 | ExtractDataInternal(const nsAString& aType, |
| michael@0 | 73 | const nsAString& aOptions, |
| michael@0 | 74 | uint8_t* aImageBuffer, |
| michael@0 | 75 | int32_t aFormat, |
| michael@0 | 76 | const nsIntSize aSize, |
| michael@0 | 77 | bool aUsePlaceholder, |
| michael@0 | 78 | nsICanvasRenderingContextInternal* aContext, |
| michael@0 | 79 | nsIInputStream** aStream, |
| michael@0 | 80 | imgIEncoder* aEncoder); |
| michael@0 | 81 | |
| michael@0 | 82 | // Creates and returns an encoder instance of the type specified in aType. |
| michael@0 | 83 | // aType may change to "image/png" if no instance of the original type could |
| michael@0 | 84 | // be created and we had to fall back to a PNG encoder. A null return value |
| michael@0 | 85 | // should be interpreted as NS_IMAGELIB_ERROR_NO_ENCODER and aType is |
| michael@0 | 86 | // undefined in this case. |
| michael@0 | 87 | static already_AddRefed<imgIEncoder> GetImageEncoder(nsAString& aType); |
| michael@0 | 88 | |
| michael@0 | 89 | friend class EncodingRunnable; |
| michael@0 | 90 | }; |
| michael@0 | 91 | |
| michael@0 | 92 | } // namespace dom |
| michael@0 | 93 | } // namespace mozilla |
| michael@0 | 94 | |
| michael@0 | 95 | #endif // ImageEncoder_h |
