image/decoders/nsIconDecoder.h@6474c204b198 (annotated)
image/decoders/nsIconDecoder.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 | * |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #ifndef nsIconDecoder_h__ |
| michael@0 | 8 | #define nsIconDecoder_h__ |
| michael@0 | 9 | |
| michael@0 | 10 | #include "Decoder.h" |
| michael@0 | 11 | |
| michael@0 | 12 | #include "nsCOMPtr.h" |
| michael@0 | 13 | |
| michael@0 | 14 | namespace mozilla { |
| michael@0 | 15 | namespace image { |
| michael@0 | 16 | class RasterImage; |
| michael@0 | 17 | |
| michael@0 | 18 | ////////////////////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 19 | // The icon decoder is a decoder specifically tailored for loading icons |
| michael@0 | 20 | // from the OS. We've defined our own little format to represent these icons |
| michael@0 | 21 | // and this decoder takes that format and converts it into 24-bit RGB with alpha channel |
| michael@0 | 22 | // support. It was modeled a bit off the PPM decoder. |
| michael@0 | 23 | // |
| michael@0 | 24 | // Assumptions about the decoder: |
| michael@0 | 25 | // (1) We receive ALL of the data from the icon channel in one OnDataAvailable call. We don't |
| michael@0 | 26 | // support multiple ODA calls yet. |
| michael@0 | 27 | // (2) the format of the incoming data is as follows: |
| michael@0 | 28 | // The first two bytes contain the width and the height of the icon. |
| michael@0 | 29 | // The remaining bytes contain the icon data, 4 bytes per pixel, in |
| michael@0 | 30 | // ARGB order (platform endianness, A in highest bits, B in lowest |
| michael@0 | 31 | // bits), row-primary, top-to-bottom, left-to-right, with |
| michael@0 | 32 | // premultiplied alpha. |
| michael@0 | 33 | // |
| michael@0 | 34 | // |
| michael@0 | 35 | ////////////////////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 36 | |
| michael@0 | 37 | class nsIconDecoder : public Decoder |
| michael@0 | 38 | { |
| michael@0 | 39 | public: |
| michael@0 | 40 | |
| michael@0 | 41 | nsIconDecoder(RasterImage &aImage); |
| michael@0 | 42 | virtual ~nsIconDecoder(); |
| michael@0 | 43 | |
| michael@0 | 44 | virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy); |
| michael@0 | 45 | |
| michael@0 | 46 | uint8_t mWidth; |
| michael@0 | 47 | uint8_t mHeight; |
| michael@0 | 48 | uint32_t mPixBytesRead; |
| michael@0 | 49 | uint32_t mState; |
| michael@0 | 50 | }; |
| michael@0 | 51 | |
| michael@0 | 52 | enum { |
| michael@0 | 53 | iconStateStart = 0, |
| michael@0 | 54 | iconStateHaveHeight = 1, |
| michael@0 | 55 | iconStateReadPixels = 2, |
| michael@0 | 56 | iconStateFinished = 3 |
| michael@0 | 57 | }; |
| michael@0 | 58 | |
| michael@0 | 59 | } // namespace image |
| michael@0 | 60 | } // namespace mozilla |
| michael@0 | 61 | |
| michael@0 | 62 | #endif // nsIconDecoder_h__ |
