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101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Scott MacGregor <mscott@netscape.com>
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* Bobby Holley <bobbyholley@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIconDecoder_h__
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#define nsIconDecoder_h__
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#include "Decoder.h"
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#include "nsCOMPtr.h"
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#include "imgIDecoderObserver.h"
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namespace mozilla {
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namespace imagelib {
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class RasterImage;
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//////////////////////////////////////////////////////////////////////////////////////////////
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// The icon decoder is a decoder specifically tailored for loading icons
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// from the OS. We've defined our own little format to represent these icons
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// and this decoder takes that format and converts it into 24-bit RGB with alpha channel
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// support. It was modeled a bit off the PPM decoder.
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//
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// Assumptions about the decoder:
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// (1) We receive ALL of the data from the icon channel in one OnDataAvailable call. We don't
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// support multiple ODA calls yet.
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// (2) the format of the incoming data is as follows:
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// The first two bytes contain the width and the height of the icon.
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// The remaining bytes contain the icon data, 4 bytes per pixel, in
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// ARGB order (platform endianness, A in highest bits, B in lowest
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// bits), row-primary, top-to-bottom, left-to-right, with
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// premultiplied alpha.
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//
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//
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//////////////////////////////////////////////////////////////////////////////////////////////
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class nsIconDecoder : public Decoder
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{
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public:
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nsIconDecoder();
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virtual ~nsIconDecoder();
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virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
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PRUint8 mWidth;
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PRUint8 mHeight;
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PRUint32 mPixBytesRead;
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PRUint32 mPixBytesTotal;
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PRUint8* mImageData;
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PRUint32 mState;
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};
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enum {
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iconStateStart = 0,
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iconStateHaveHeight = 1,
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iconStateReadPixels = 2,
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iconStateFinished = 3
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};
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} // namespace imagelib
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} // namespace mozilla
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#endif // nsIconDecoder_h__
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