147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
// This source file contains the functions needed to read in PCX files.
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// (c) 1995 ACK Software (Lary Myers)
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#include <stdio.h>
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#include <io.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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//typedef unsigned short USHORT;
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#include "ack3d.h" // Main ACK-3D internal and interface data structures
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#include "ackeng.h" // Internal data structures and constants
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#include "ackext.h" // Defines external (global) variables
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typedef struct
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{
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char manufacturer; /* Always set to 0 */
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char version; /* Always 5 for 256-color files */
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char encoding; /* Always set to 1 */
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char bits_per_pixel; /* Should be 8 for 256-color files */
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short xmin,ymin; /* Coordinates for top left corner */
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short xmax,ymax; /* Width and height of image */
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short hres; /* Horizontal resolution of image */
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short vres; /* Vertical resolution of image */
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char palette16[48]; /* EGA palette; not used for 256-color files */
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char reserved; /* Reserved for future use */
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char color_planes; /* Color planes */
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short bytes_per_line; /* Number of bytes in 1 line of pixels */
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short palette_type; /* Should be 2 for color palette */
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char filler[58]; /* Nothing but junk */
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} PcxHeader;
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typedef struct
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{
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PcxHeader hdr;
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UCHAR *bitmap;
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UCHAR pal[768];
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unsigned short imagebytes,width,height;
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} PcxFile;
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#define PCX_MAX_SIZE 64000L
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enum {PCX_OK,PCX_NOMEM,PCX_TOOBIG,PCX_NOFILE};
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enum {NORMAL,RLE};
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enum {FALSE,TRUE};
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PcxFile pcxGlobal; // data structure for reading PCX files
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extern unsigned char colordat[];
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//
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// This routine loads a 256 color PCX file.
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//
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unsigned char *AckReadPCX(char *filename)
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{
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long i;
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int mode=NORMAL,nbytes;
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char abyte,*p;
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FILE *f;
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PcxFile *pcx;
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pcx = &pcxGlobal;
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if (!rsHandle)
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{
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f=fopen(filename,"rb");
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if (f==NULL)
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{
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ErrorCode = ERR_BADFILE;
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return NULL;
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}
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}
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else
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{
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f = fdopen (rsHandle, "rb");
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if (f == NULL)
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{
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ErrorCode = ERR_BADPICNAME;
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return (0L);
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}
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fseek (f, rbaTable[(ULONG) filename], SEEK_SET);
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}
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fread(&pcx->hdr,sizeof(PcxHeader),1,f);
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pcx->width=1+pcx->hdr.xmax-pcx->hdr.xmin;
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pcx->height=1+pcx->hdr.ymax-pcx->hdr.ymin;
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pcx->imagebytes=(unsigned int)(pcx->width*pcx->height);
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if (pcx->imagebytes > PCX_MAX_SIZE)
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{
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if (!rsHandle)
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fclose(f);
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ErrorCode = ERR_INVALIDFORM;
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return(NULL);
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}
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pcx->bitmap=(UCHAR*)AckMalloc(pcx->imagebytes+4);
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if (pcx->bitmap == NULL)
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{
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if (!rsHandle)
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fclose(f);
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ErrorCode = ERR_NOMEMORY;
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return(NULL);
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}
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p=(char*)&pcx->bitmap[4];
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for (i=0;i<pcx->imagebytes;i++)
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{
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if(mode == NORMAL)
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{
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abyte=fgetc(f);
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if ((unsigned char)abyte > 0xbf)
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{
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nbytes=abyte & 0x3f;
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abyte=fgetc(f);
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if (--nbytes > 0)
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mode=RLE;
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}
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}
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else if (--nbytes == 0)
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mode=NORMAL;
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*p++=abyte;
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}
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fseek(f,-768L,SEEK_END); // get palette from pcx file
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fread(colordat,768,1,f);
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p=(char*)colordat;
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for (i=0;i<768;i++) // bit shift palette
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*p++=*p >>2;
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if (!rsHandle)
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fclose(f);
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p = (char*)pcx->bitmap;
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(*(short *)p) = pcx->width;
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p += sizeof(short);
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(*(short *)p) = pcx->height;
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return(pcx->bitmap); // return success
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}
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// **** End of Source ****
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