52a3801208
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96
118 lines
4.4 KiB
C++
118 lines
4.4 KiB
C++
/*****************************************************************************/
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// File: BitmapStream.h
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// Class: BBitmapStream
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// Reimplimented by: Travis Smith, Michael Wilber, Translation Kit Team
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// Reimplimentation: 2002-04
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//
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// Description: BPositionIO based object to read/write bitmap format to/from
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// a BBitmap object.
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//
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// The BTranslationUtils class uses this object and makes it
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// easy for users to load bitmaps.
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//
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// Copyright (c) 2002 OpenBeOS Project
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//
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// Original Version: Copyright 1998, Be Incorporated, All Rights Reserved.
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// Copyright 1995-1997, Jon Watte
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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/*****************************************************************************/
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#if !defined(_BITMAP_STREAM_H)
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#define _BITMAP_STREAM_H
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#include <BeBuild.h>
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#include <TranslationDefs.h>
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#include <DataIO.h>
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#include <TranslatorFormats.h>
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#include <ByteOrder.h>
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class BBitmap;
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class BBitmapStream : public BPositionIO {
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public:
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BBitmapStream(BBitmap *bitmap = NULL);
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// Initializes the stream to use map as the bitmap for stream
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// operations. If map is null, a BBitmap is created when properly
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// formatted data is written to the stream.
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~BBitmapStream();
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// Destroys the BBitmap held by this object if it has not been
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// detached and frees fpBigEndianHeader
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// Overrides from BPositionIO
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ssize_t ReadAt(off_t pos, void *buffer, size_t size);
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// reads data from the bitmap into buffer
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ssize_t WriteAt(off_t pos, const void *data, size_t size);
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// writes the data from data into this bitmap
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// (if the data is properly formatted)
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off_t Seek(off_t position, uint32 whence);
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// sets the stream position member
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off_t Position() const;
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// returns the current stream position
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off_t Size() const;
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// returns the size of the data
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status_t SetSize(off_t size);
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// sets the amount of memory to be used by this object
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status_t DetachBitmap(BBitmap **outMap);
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// "Detaches" the bitmap used by this stream and returns it
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// to the user through outMap. This allows the user to
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// use the bitmap even after the BBitmapStream that it
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// came from has been deleted.
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protected:
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TranslatorBitmap fHeader;
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// stores the bitmap header information in the
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// host format, used to determine the format of
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// the bitmap data and to see if the data is valid
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BBitmap *fBitmap;
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// the actual bitmap used by this object
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size_t fPosition;
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// current data position
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size_t fSize;
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// size of the data stored
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bool fDetached;
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// true if the bitmap has been detached, false if not
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static status_t ConvertBEndianToHost(TranslatorBitmap *);
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// Converts a TranslatorBitmap struct from the Big Endian
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// format to the host format. This is needed because
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// the headers are always stored in the Big Endian format
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// when read in from or written out to files.
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status_t SetBigEndianHeader();
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// Sets fpBigEndianHeader to be the Big Endian version
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// of the data in fHeader. I need a Big Endian copy
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// of fHeader for the ReadAt() function.
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private:
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TranslatorBitmap *fpBigEndianHeader;
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// same data as in fHeader, but in Big Endian format
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// (Intel machines are Little Endian)
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// For maintaining binary compatibility with past and future
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// versions of this object
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long fUnused[5];
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virtual void _ReservedBitmapStream1();
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virtual void _ReservedBitmapStream2();
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};
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#endif /* _BITMAP_STREAM_H */
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