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77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2001 Netscape Communications Corporation.
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* 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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*/
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#ifndef nsIconDecoder_h__
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#define nsIconDecoder_h__
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#include "imgIDecoder.h"
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#include "nsCOMPtr.h"
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#include "imgIContainer.h"
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#include "imgIDecoderObserver.h"
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#include "gfxIImageFrame.h"
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#define NS_ICONDECODER_CID \
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{ /* FFC08380-256C-11d5-9905-001083010E9B */ \
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0xffc08380, \
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0x256c, \
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0x11d5, \
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{ 0x99, 0x5, 0x0, 0x10, 0x83, 0x1, 0xe, 0x9b } \
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}
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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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// Followed by 3 bytes per pixel for the color bitmap row after row. (for heigh * width * 3 bytes)
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// Followed by bit mask data (used for transparency on the alpha channel).
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//
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//
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//////////////////////////////////////////////////////////////////////////////////////////////
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class nsIconDecoder : public imgIDecoder
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_IMGIDECODER
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nsIconDecoder();
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virtual ~nsIconDecoder();
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private:
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nsCOMPtr<imgIContainer> mImage;
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nsCOMPtr<gfxIImageFrame> mFrame;
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nsCOMPtr<imgIDecoderObserver> mObserver; // this is just qi'd from mRequest for speed
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};
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#endif // nsIconDecoder_h__
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