The Tor Browser / file comparison
comparison: image/decoders/nsIconDecoder.h
image/decoders/nsIconDecoder.h
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
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| -1:000000000000 | 0:98b8c01593de |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef nsIconDecoder_h__ | |
| 8 #define nsIconDecoder_h__ | |
| 9 | |
| 10 #include "Decoder.h" | |
| 11 | |
| 12 #include "nsCOMPtr.h" | |
| 13 | |
| 14 namespace mozilla { | |
| 15 namespace image { | |
| 16 class RasterImage; | |
| 17 | |
| 18 ////////////////////////////////////////////////////////////////////////////////////////////// | |
| 19 // The icon decoder is a decoder specifically tailored for loading icons | |
| 20 // from the OS. We've defined our own little format to represent these icons | |
| 21 // and this decoder takes that format and converts it into 24-bit RGB with alpha channel | |
| 22 // support. It was modeled a bit off the PPM decoder. | |
| 23 // | |
| 24 // Assumptions about the decoder: | |
| 25 // (1) We receive ALL of the data from the icon channel in one OnDataAvailable call. We don't | |
| 26 // support multiple ODA calls yet. | |
| 27 // (2) the format of the incoming data is as follows: | |
| 28 // The first two bytes contain the width and the height of the icon. | |
| 29 // The remaining bytes contain the icon data, 4 bytes per pixel, in | |
| 30 // ARGB order (platform endianness, A in highest bits, B in lowest | |
| 31 // bits), row-primary, top-to-bottom, left-to-right, with | |
| 32 // premultiplied alpha. | |
| 33 // | |
| 34 // | |
| 35 ////////////////////////////////////////////////////////////////////////////////////////////// | |
| 36 | |
| 37 class nsIconDecoder : public Decoder | |
| 38 { | |
| 39 public: | |
| 40 | |
| 41 nsIconDecoder(RasterImage &aImage); | |
| 42 virtual ~nsIconDecoder(); | |
| 43 | |
| 44 virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy); | |
| 45 | |
| 46 uint8_t mWidth; | |
| 47 uint8_t mHeight; | |
| 48 uint32_t mPixBytesRead; | |
| 49 uint32_t mState; | |
| 50 }; | |
| 51 | |
| 52 enum { | |
| 53 iconStateStart = 0, | |
| 54 iconStateHaveHeight = 1, | |
| 55 iconStateReadPixels = 2, | |
| 56 iconStateFinished = 3 | |
| 57 }; | |
| 58 | |
| 59 } // namespace image | |
| 60 } // namespace mozilla | |
| 61 | |
| 62 #endif // nsIconDecoder_h__ |
