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/*
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* PCX-loading routines
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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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* Published under the terms of the MIT License, as stated below.
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*
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* Copyright (C) 2022-2023 Mateusz Viste
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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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* 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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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* 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 in
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* 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 OR
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* 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 THE
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* 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 DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef 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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unsigned char rle;
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unsigned char bpp;
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unsigned short max_x;
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unsigned short max_y;
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unsigned short bytes_per_scanline;
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struct {
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unsigned char r;
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unsigned char g;
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unsigned char b;
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} pal[256];
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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 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 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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* 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 mdr_pcx_to8bpp(void *img, const struct pcx_hdr *h, unsigned char rowflag);
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#endif
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