178 lines
4.3 KiB
C
178 lines
4.3 KiB
C
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file bmp.h
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*/
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#ifndef _BMP_H_
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#define _BMP_H_
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#include "pandabase.h"
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#include "pnmimage_base.h"
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/* prototypes */
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static unsigned long BMPlenfileheader(int classv);
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static unsigned long BMPleninfoheader(int classv);
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static unsigned long BMPlenrgbtable(int classv, unsigned long bitcount);
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static unsigned long BMPlenline(int classv, unsigned long bitcount, unsigned long x);
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static unsigned long BMPlenbits(int classv, unsigned long bitcount, unsigned long x, unsigned long y);
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static unsigned long BMPlenfile(int classv, unsigned long bitcount, unsigned long x, unsigned long y);
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static unsigned long BMPoffbits(int classv, unsigned long bitcount);
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/*
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* Classves of BMP files
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*/
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#define C_WIN 1
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#define C_OS2 2
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#define C_WINV2 3
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#define C_WINV3 4
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#define C_WINV4 5
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#define C_WINV5 6
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static char er_internal[] = "%s: internal error!";
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static unsigned long
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BMPlenfileheader(int classv)
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{
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switch (classv)
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{
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case C_WIN:
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case C_OS2:
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case C_WINV2:
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case C_WINV3:
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case C_WINV4:
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case C_WINV5:
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return 14;
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return 14;
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default:
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pm_error(er_internal, "BMPlenfileheader");
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return 0;
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}
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}
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static unsigned long
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BMPleninfoheader(int classv)
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{
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switch (classv)
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{
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case C_WIN:
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return 40;
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case C_OS2:
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return 12;
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case C_WINV2:
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return 52;
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case C_WINV3:
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return 56;
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case C_WINV4:
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return 108;
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case C_WINV5:
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return 124;
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default:
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pm_error(er_internal, "BMPleninfoheader");
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return 0;
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}
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}
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static unsigned long
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BMPlenrgbtable(int classv, unsigned long bitcount)
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{
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unsigned long lenrgb;
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if (bitcount > 8) {
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return 0;
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}
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if (bitcount < 1)
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{
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pm_error(er_internal, "BMPlenrgbtable");
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return 0;
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}
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switch (classv)
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{
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case C_WIN:
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lenrgb = 4;
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break;
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case C_OS2:
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lenrgb = 3;
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break;
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default:
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pm_error(er_internal, "BMPlenrgbtable");
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return 0;
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}
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return (1 << bitcount) * lenrgb;
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}
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/*
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* length, in bytes, of a line of the image
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*
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* Evidently each row is padded on the right as needed to make it a
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* multiple of 4 bytes long. This appears to be true of both
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* OS/2 and Windows BMP files.
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*/
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static unsigned long
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BMPlenline(int classv, unsigned long bitcount, unsigned long x)
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{
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unsigned long bitsperline;
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bitsperline = x * bitcount;
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/*
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* if bitsperline is not a multiple of 32, then round
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* bitsperline up to the next multiple of 32.
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*/
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if ((bitsperline % 32) != 0)
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{
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bitsperline += (32 - (bitsperline % 32));
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}
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if ((bitsperline % 32) != 0)
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{
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pm_error(er_internal, "BMPlenline");
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return 0;
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}
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/* number of bytes per line == bitsperline/8 */
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return bitsperline >> 3;
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}
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/* return the number of bytes used to store the image bits */
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static unsigned long
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BMPlenbits(
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int classv,
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unsigned long bitcount,
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unsigned long x,
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unsigned long y)
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{
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return y * BMPlenline(classv, bitcount, x);
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}
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/* return the offset to the BMP image bits */
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static unsigned long
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BMPoffbits(
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int classv,
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unsigned long bitcount)
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{
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return BMPlenfileheader(classv)
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+ BMPleninfoheader(classv)
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+ BMPlenrgbtable(classv, bitcount);
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}
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/* return the size of the BMP file in bytes */
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static unsigned long
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BMPlenfile(
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int classv,
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unsigned long bitcount,
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unsigned long x,
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unsigned long y)
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{
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return BMPoffbits(classv, bitcount)
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+ BMPlenbits(classv, bitcount, x, y);
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}
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#endif /* _BMP_H_ */
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