Subversion Repositories SvarDOS

Rev

Rev 1360 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 1360 Rev 1542
Line 2... Line 2...
2 
 * PCX-loading routines
2 
 * PCX-loading routines
3 
 *
3 
 *
4 
 * This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io
4 
 * This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io
5 
 * Published under the terms of the MIT License, as stated below.
5 
 * Published under the terms of the MIT License, as stated below.
6 
 *
6 
 *
7 
 * Copyright (C) 2022 Mateusz Viste
7 
 * Copyright (C) 2022-2023 Mateusz Viste
8 
 *
8 
 *
9 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 
 * of this software and associated documentation files (the "Software"), to
10 
 * of this software and associated documentation files (the "Software"), to
11 
 * deal in the Software without restriction, including without limitation the
11 
 * deal in the Software without restriction, including without limitation the
12 
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
12 
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
Line 26... Line 26...
26 
 */
 26 
 */
27 
 
 27 
 
28 
#ifndef MDR_PCX_H
 28 
#ifndef MDR_PCX_H
29 
#define MDR_PCX_H
 29 
#define MDR_PCX_H
30 
 
 30 
 
- 
 
 31 
#include <stdio.h> /* FILE */
- 
 
 32 
 
31 
struct pcx_hdr {
 33 
struct pcx_hdr {
32 
  unsigned char rle;
 34 
  unsigned char rle;
33 
  unsigned char bpp;
 35 
  unsigned char bpp;
34 
  unsigned short max_x;
 36 
  unsigned short max_x;
35 
  unsigned short max_y;
 37 
  unsigned short max_y;
Line 39... Line 41...
39 
    unsigned char g;
 41 
    unsigned char g;
40 
    unsigned char b;
 42 
    unsigned char b;
41 
  } pal[256];
 43 
  } pal[256];
42 
};
 44 
};
43 
 
 45 
 
- 
 
 46 
/* analyzes the header of a PCX file and fills the pcx_hdr struct accordingly.
- 
 
 47 
 * fd      must be a valid (open) file descriptor.
- 
 
 48 
 * offset  is the address inside the file where the PCX data is located
- 
 
 49 
 *         (usually 0, unless the file is some kind of container).
- 
 
 50 
 * len     is the total length of the PCX data. len=0 means "same as file size"
- 
 
 51 
 * returns 0 on success, non-zero otherwise. */
44 
int pcx_anal(struct pcx_hdr *h, FILE *fd, unsigned long offset, unsigned short len);
 52 
int mdr_pcx_anal(struct pcx_hdr *h, FILE *fd, unsigned long offset, unsigned long len);
- 
 
 53 
 
- 
 
 54 
/* this function should be called to load the next row of a PCX file into a
- 
 
 55 
 * buffer pointed at by bufptr. you will typically want to call this function
- 
 
 56 
 * h->max_y times. ptr must be at least (h->max_x + 1) bytes large for 8bpp.
- 
 
 57 
 * the pcx_hdr struct must have been produced by pcx_anal().
- 
 
 58 
 * returns 0 on success, non-zero otherwise. */
- 
 
 59 
int mdr_pcx_loadrow(void *bufptr, const struct pcx_hdr *h, FILE *fd);
- 
 
 60 
 
- 
 
 61 
/* load an entire PCX file into a pixel buffer. the PCX data must have been
- 
 
 62 
 * previously analyzed by pcx_anal() and the fd file pointer must not have been
- 
 
 63 
 * modified since then. the destination buffer must be large enough to hold all
- 
 
 64 
 * pixels, ie. (h->max_x + 1) * (h->max_y + 1) for 8 bpp.
- 
 
 65 
 * returns 0 on success, non-zero otherwise. */
45 
int pcx_load(void *ptr, size_t ptrsz, const struct pcx_hdr *h, FILE *fd, unsigned long offset);
 66 
int mdr_pcx_load(void *ptr, const struct pcx_hdr *h, FILE *fd);
46 
 
 67 
 
47 
/* convert img to 8bpp if needed (ie unpack 2 and 4bpp data to 8bpp) */
 68 
/* convert img to 8bpp if needed (ie unpack 2 and 4bpp data to 8bpp).
- 
 
 69 
 * the conversion is performed in-place, make sure the img buffer is large
- 
 
 70 
 * enough to accomodate the size of the data after conversion (ie. twice as
- 
 
 71 
 * big on 4bpp source, 4x times as big on 2bpp source and 8x as big on 1bpp
- 
 
 72 
 * source).
- 
 
 73 
 * if rowflag is set to a non-zero value, then the routine assumes img
- 
 
 74 
 * contains only a single row of pixels */
48 
int pcx_convto8bpp(void *img, const struct pcx_hdr *h);
 75 
int mdr_pcx_to8bpp(void *img, const struct pcx_hdr *h, unsigned char rowflag);
49 
 
 76 
 
50 
#endif
77 
#endif