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| /* |
| * PCX-loading routines |
| * |
| * This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io |
| * Published under the terms of the MIT License, as stated below. |
| * |
| * Copyright (C) 2022-2023 Mateusz Viste |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #ifndef MDR_PCX_H |
| #define MDR_PCX_H |
| |
| #include <stdio.h> /* FILE */ |
| |
| struct pcx_hdr { |
| unsigned char rle; |
| unsigned char bpp; |
| unsigned short max_x; |
| unsigned short max_y; |
| unsigned short bytes_per_scanline; |
| struct { |
| unsigned char r; |
| unsigned char g; |
| unsigned char b; |
| } pal[256]; |
| }; |
| |
| /* analyzes the header of a PCX file and fills the pcx_hdr struct accordingly. |
| * fd must be a valid (open) file descriptor. |
| * offset is the address inside the file where the PCX data is located |
| * (usually 0, unless the file is some kind of container). |
| * len is the total length of the PCX data. len=0 means "same as file size" |
| * returns 0 on success, non-zero otherwise. */ |
| int mdr_pcx_anal(struct pcx_hdr *h, FILE *fd, unsigned long offset, unsigned long len); |
| |
| /* this function should be called to load the next row of a PCX file into a |
| * buffer pointed at by bufptr. you will typically want to call this function |
| * h->max_y times. ptr must be at least (h->max_x + 1) bytes large for 8bpp. |
| * the pcx_hdr struct must have been produced by pcx_anal(). |
| * returns 0 on success, non-zero otherwise. */ |
| int mdr_pcx_loadrow(void *bufptr, const struct pcx_hdr *h, FILE *fd); |
| |
| /* load an entire PCX file into a pixel buffer. the PCX data must have been |
| * previously analyzed by pcx_anal() and the fd file pointer must not have been |
| * modified since then. the destination buffer must be large enough to hold all |
| * pixels, ie. (h->max_x + 1) * (h->max_y + 1) for 8 bpp. |
| * returns 0 on success, non-zero otherwise. */ |
| int mdr_pcx_load(void *ptr, const struct pcx_hdr *h, FILE *fd); |
| |
| /* convert img to 8bpp if needed (ie unpack 2 and 4bpp data to 8bpp). |
| * the conversion is performed in-place, make sure the img buffer is large |
| * enough to accomodate the size of the data after conversion (ie. twice as |
| * big on 4bpp source, 4x times as big on 2bpp source and 8x as big on 1bpp |
| * source). |
| * if rowflag is set to a non-zero value, then the routine assumes img |
| * contains only a single row of pixels */ |
| int mdr_pcx_to8bpp(void *img, const struct pcx_hdr *h, unsigned char rowflag); |
| |
| #endif |