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c:graphics.h:getpalette

getpalette

Syntax of getpalette

#include <graphics.h>
void getpalette(struct palettetype *palette);
 

Description of getpalette

getpalette fills the palettetype structure pointed to by palette with
information about the current palette's size and colors.
The MAXCOLORS constant and the palettetype structure used by getpalette
are defined in graphics.h as follows:
#define MAXCOLORS  15
 
struct palettetype {
   unsigned char size;
   signed char colors[MAXCOLORS + 1];
};
size gives the number of colors in the palette for the current graphics
driver in the current mode.
colors is an array of size bytes containing the actual raw color numbers
for each entry in the palette.
getpalette cannot be used with the IBM-8514 driver.

Example of getpalette

/* getpalette example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main()
{
 
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   struct palettetype pal;
   char psize[80], pval[20];
   int i, ht;
   int y = 10;
 
   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");
 
   /* read result of initialization */
   errorcode = graphresult();
   if (errorcode != grOk) {  /* an error occurred */
 
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1);   /* terminate with an error code */
   }
 
   /* grab a copy of the palette */
   getpalette(&pal);
 
   /* convert palette info into strings */
   sprintf(psize, "The palette has %d modifiable entries.", pal.size);
 
   /* display the information */
   outtextxy(0, y, psize);
   if (pal.size != 0) {
ht = textheight("W");
 
y += 2*ht;
outtextxy(0, y, "Here are the current values:");
y += 2*ht;
for (i=0; i<pal.size; i++, y+=ht) {
   sprintf(pval, "palette[%02d]: 0x%02X", i, pal.colors[i]);
   outtextxy(0, y, pval);
}
   }
 
   /* clean up */
   getch();
   closegraph();
   return 0;
}

See also

output of getpalette example

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c/graphics.h/getpalette.txt · Last modified: 2015/05/06 23:06 (external edit)

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