4,7 → 4,7 |
* 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 Mateusz Viste |
* 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 |
28,6 → 28,8 |
#ifndef MDR_PCX_H |
#define MDR_PCX_H |
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#include <stdio.h> /* FILE */ |
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struct pcx_hdr { |
unsigned char rle; |
unsigned char bpp; |
41,10 → 43,35 |
} pal[256]; |
}; |
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int pcx_anal(struct pcx_hdr *h, FILE *fd, unsigned long offset, unsigned short len); |
int pcx_load(void *ptr, size_t ptrsz, const struct pcx_hdr *h, FILE *fd, unsigned long offset); |
/* 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); |
|
/* convert img to 8bpp if needed (ie unpack 2 and 4bpp data to 8bpp) */ |
int pcx_convto8bpp(void *img, const struct pcx_hdr *h); |
/* 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); |
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#endif |