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 * PCX-loading routines
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 * PCX-loading routines
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 *
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 *
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 * This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io
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 * This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io
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 * Published under the terms of the MIT License, as stated below.
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 * Published under the terms of the MIT License, as stated below.
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 *
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 *
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 * Copyright (C) 2022 Mateusz Viste
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 * Copyright (C) 2022-2023 Mateusz Viste
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 *
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to
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 * of this software and associated documentation files (the "Software"), to
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 * deal in the Software without restriction, including without limitation the
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 * deal in the Software without restriction, including without limitation the
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 */
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 */
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#ifndef MDR_PCX_H
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#ifndef MDR_PCX_H
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#define MDR_PCX_H
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#define MDR_PCX_H
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#include <stdio.h> /* FILE */
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struct pcx_hdr {
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struct pcx_hdr {
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  unsigned char rle;
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  unsigned char rle;
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  unsigned char bpp;
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  unsigned char bpp;
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  unsigned short max_x;
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  unsigned short max_x;
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  unsigned short max_y;
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  unsigned short max_y;
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    unsigned char g;
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    unsigned char g;
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    unsigned char b;
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    unsigned char b;
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  } pal[256];
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  } pal[256];
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};
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};
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/* analyzes the header of a PCX file and fills the pcx_hdr struct accordingly.
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 * fd      must be a valid (open) file descriptor.
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 * offset  is the address inside the file where the PCX data is located
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 *         (usually 0, unless the file is some kind of container).
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 * len     is the total length of the PCX data. len=0 means "same as file size"
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 * returns 0 on success, non-zero otherwise. */
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int pcx_anal(struct pcx_hdr *h, FILE *fd, unsigned long offset, unsigned short len);
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int mdr_pcx_anal(struct pcx_hdr *h, FILE *fd, unsigned long offset, unsigned long len);
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/* this function should be called to load the next row of a PCX file into a
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 * buffer pointed at by bufptr. you will typically want to call this function
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 * h->max_y times. ptr must be at least (h->max_x + 1) bytes large for 8bpp.
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 * the pcx_hdr struct must have been produced by pcx_anal().
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 * returns 0 on success, non-zero otherwise. */
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int mdr_pcx_loadrow(void *bufptr, const struct pcx_hdr *h, FILE *fd);
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/* load an entire PCX file into a pixel buffer. the PCX data must have been
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 * previously analyzed by pcx_anal() and the fd file pointer must not have been
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 * modified since then. the destination buffer must be large enough to hold all
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 * pixels, ie. (h->max_x + 1) * (h->max_y + 1) for 8 bpp.
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 * returns 0 on success, non-zero otherwise. */
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int pcx_load(void *ptr, size_t ptrsz, const struct pcx_hdr *h, FILE *fd, unsigned long offset);
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int mdr_pcx_load(void *ptr, const struct pcx_hdr *h, FILE *fd);
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/* convert img to 8bpp if needed (ie unpack 2 and 4bpp data to 8bpp) */
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/* convert img to 8bpp if needed (ie unpack 2 and 4bpp data to 8bpp).
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 * the conversion is performed in-place, make sure the img buffer is large
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 * enough to accomodate the size of the data after conversion (ie. twice as
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 * big on 4bpp source, 4x times as big on 2bpp source and 8x as big on 1bpp
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 * source).
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 * if rowflag is set to a non-zero value, then the routine assumes img
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 * contains only a single row of pixels */
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int pcx_convto8bpp(void *img, const struct pcx_hdr *h);
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int mdr_pcx_to8bpp(void *img, const struct pcx_hdr *h, unsigned char rowflag);
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#endif
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#endif