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CICA 1993 April
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CICA MS Windows - April 1993.iso
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bmp2bgi
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showbgi2.c
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C/C++ Source or Header
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1991-05-26
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3KB
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63 lines
#include <stdio.h>
#include <graphics.h>
#include <alloc.h>
#include "bgi.h"
extern BGIPREFACE BGIHeader; // Header stuff for the BGI
// files created w/ BMP2BGI
void ShowBGI (FILE *f, char far *VidBuf[5])
{
int ystart=0, yend, yincr, i; // var's for processing BGI images >= 64k
unsigned size;
setallpalette(&BGIHeader.palette); // Set the screen palette
// Just how big are we talking?
size = imagesize(0, 0, BGIHeader.Width, BGIHeader.Height);
// Reset File pointer to where
// the image resides
fseek(f, BGIHeader.Foffset, SEEK_SET);
// if image is less than 64k-1
// bytes, read it all in at once
if (size != NULLIMAGESIZE)
{
// Alloc space for image
VidBuf[0] = (char far *) farmalloc((unsigned long) size);
// Read in image
fread(VidBuf[0], sizeof(char), size, f);
putimage(0, 0, VidBuf[0], COPY_PUT); // & Display the image
farfree(VidBuf[0]); // Free up allocated space
}
else // if image is >= 64k, gotta
{ // fetch & display in chunks
yincr = (BGIHeader.Height+1) / 5; // large images are stored in fifths
yend = yincr; // track end of chunk
size = imagesize(0,ystart,BGIHeader.Width,yend);
for (i=0; i < 5; i++)
{
if ((VidBuf[i] = (char far *) farmalloc((unsigned long) size)) == NULL)
{
// Can't display: No memory for image
closegraph();
printf("ShowBGI> Out of heap space.\n");
printf("ShowBGI> Press any key to abort");
getch();
exit(12);
}
// Read in i-th chunk
fread(VidBuf[i], sizeof(char), size, f);
// and display the chunk
putimage(0, ystart, VidBuf[i], COPY_PUT);
farfree(VidBuf[i]); // free up some memory
ystart = yend + 1; // advance boundaries for
yend += yincr + 1; // next chunk
}
}
}