The Tor Browser / file comparison
comparison: content/canvas/src/ImageEncoder.h
content/canvas/src/ImageEncoder.h
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
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| -1:000000000000 | 0:25c63d10d66f |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef ImageEncoder_h | |
| 7 #define ImageEncoder_h | |
| 8 | |
| 9 #include "imgIEncoder.h" | |
| 10 #include "nsDOMFile.h" | |
| 11 #include "nsError.h" | |
| 12 #include "mozilla/dom/HTMLCanvasElementBinding.h" | |
| 13 #include "nsLayoutUtils.h" | |
| 14 #include "nsNetUtil.h" | |
| 15 #include "nsSize.h" | |
| 16 | |
| 17 class nsICanvasRenderingContextInternal; | |
| 18 | |
| 19 namespace mozilla { | |
| 20 namespace dom { | |
| 21 | |
| 22 class EncodingRunnable; | |
| 23 | |
| 24 class ImageEncoder | |
| 25 { | |
| 26 public: | |
| 27 // Extracts data synchronously and gives you a stream containing the image | |
| 28 // represented by aContext. aType may change to "image/png" if we had to fall | |
| 29 // back to a PNG encoder. A return value of NS_OK implies successful data | |
| 30 // extraction. If there are any unrecognized custom parse options in | |
| 31 // aOptions, NS_ERROR_INVALID_ARG will be returned. When encountering this | |
| 32 // error it is usual to call this function again without any options at all. | |
| 33 static nsresult ExtractData(nsAString& aType, | |
| 34 const nsAString& aOptions, | |
| 35 const nsIntSize aSize, | |
| 36 bool aUsePlaceholder, | |
| 37 nsICanvasRenderingContextInternal* aContext, | |
| 38 nsIInputStream** aStream); | |
| 39 | |
| 40 // Extracts data asynchronously. aType may change to "image/png" if we had to | |
| 41 // fall back to a PNG encoder. aOptions are the options to be passed to the | |
| 42 // encoder and aUsingCustomOptions specifies whether custom parse options were | |
| 43 // used (i.e. by using -moz-parse-options). If there are any unrecognized | |
| 44 // custom parse options, we fall back to the default values for the encoder | |
| 45 // without any options at all. A return value of NS_OK only implies | |
| 46 // successful dispatching of the extraction step to the encoding thread. | |
| 47 static nsresult ExtractDataAsync(nsAString& aType, | |
| 48 const nsAString& aOptions, | |
| 49 bool aUsingCustomOptions, | |
| 50 uint8_t* aImageBuffer, | |
| 51 int32_t aFormat, | |
| 52 const nsIntSize aSize, | |
| 53 bool aUsePlaceholder, | |
| 54 nsICanvasRenderingContextInternal* aContext, | |
| 55 nsIScriptContext* aScriptContext, | |
| 56 FileCallback& aCallback); | |
| 57 | |
| 58 // Gives you a stream containing the image represented by aImageBuffer. | |
| 59 // The format is given in aFormat, for example | |
| 60 // imgIEncoder::INPUT_FORMAT_HOSTARGB. | |
| 61 static nsresult GetInputStream(int32_t aWidth, | |
| 62 int32_t aHeight, | |
| 63 uint8_t* aImageBuffer, | |
| 64 int32_t aFormat, | |
| 65 imgIEncoder* aEncoder, | |
| 66 const char16_t* aEncoderOptions, | |
| 67 nsIInputStream** aStream); | |
| 68 | |
| 69 private: | |
| 70 // When called asynchronously, aContext is null. | |
| 71 static nsresult | |
| 72 ExtractDataInternal(const nsAString& aType, | |
| 73 const nsAString& aOptions, | |
| 74 uint8_t* aImageBuffer, | |
| 75 int32_t aFormat, | |
| 76 const nsIntSize aSize, | |
| 77 bool aUsePlaceholder, | |
| 78 nsICanvasRenderingContextInternal* aContext, | |
| 79 nsIInputStream** aStream, | |
| 80 imgIEncoder* aEncoder); | |
| 81 | |
| 82 // Creates and returns an encoder instance of the type specified in aType. | |
| 83 // aType may change to "image/png" if no instance of the original type could | |
| 84 // be created and we had to fall back to a PNG encoder. A null return value | |
| 85 // should be interpreted as NS_IMAGELIB_ERROR_NO_ENCODER and aType is | |
| 86 // undefined in this case. | |
| 87 static already_AddRefed<imgIEncoder> GetImageEncoder(nsAString& aType); | |
| 88 | |
| 89 friend class EncodingRunnable; | |
| 90 }; | |
| 91 | |
| 92 } // namespace dom | |
| 93 } // namespace mozilla | |
| 94 | |
| 95 #endif // ImageEncoder_h |
