gdxpm.c

/* 
add ability to load xpm files to gd, requires the xpm
library.
Caolan.McNamara@ul.ie 
http://www.csn.ul.ie/~caolan
*/
#include <stdio.h>
#include <stdlib.h>
#include "gd.h"

#ifndef HAVE_XPM
gdImagePtr gdImageCreateFromXpm(char *filename)
	{
	fprintf(stderr,"libgd was not built with xpm support\n");
	return(NULL);
	}

#else

#include "xpm.h"

gdImagePtr gdImageCreateFromXpm(char *filename)
	{
	XpmInfo info;
	XpmImage image;
	int i,j,k,number;
	char buf[5];
	gdImagePtr im = 0;
	char *apixel;
	int *pointer;
	int red=0,green=0,blue=0,color=0;
	int *colors;
	int ret;

	ret = XpmReadFileToXpmImage(filename,&image,&info);
	if (ret != XpmSuccess)
		return 0;

	if (!(im = gdImageCreate(image.width, image.height))) 
	    return 0;

	number = image.ncolors;
	colors = (int*)malloc(sizeof(int) * number);
	if (colors == NULL)
		return(0);
	for (i = 0; i < number; i++) 
		{
		switch(strlen(image.colorTable[i].c_color))
			{
			case 4:
				buf[1] = '\0';
				buf[0] = image.colorTable[i].c_color[1];
				red = strtol(buf,NULL,16);

				buf[0] = image.colorTable[i].c_color[3];
				green = strtol(buf,NULL,16);

				buf[0] = image.colorTable[i].c_color[5];
				blue = strtol(buf,NULL,16);
				break;
			case 7:
				buf[2] = '\0';
				buf[0] = image.colorTable[i].c_color[1];
				buf[1] = image.colorTable[i].c_color[2];
				red = strtol(buf,NULL,16);

				buf[0] = image.colorTable[i].c_color[3];
				buf[1] = image.colorTable[i].c_color[4];
				green = strtol(buf,NULL,16);

				buf[0] = image.colorTable[i].c_color[5];
				buf[1] = image.colorTable[i].c_color[6];
				blue = strtol(buf,NULL,16);
				break;
			case 10:
				buf[3] = '\0';
				buf[0] = image.colorTable[i].c_color[1];
				buf[1] = image.colorTable[i].c_color[2];
				buf[2] = image.colorTable[i].c_color[3];
				red = strtol(buf,NULL,16);
				red /= 64;

				buf[0] = image.colorTable[i].c_color[4];
				buf[1] = image.colorTable[i].c_color[5];
				buf[2] = image.colorTable[i].c_color[6];
				green = strtol(buf,NULL,16);
				green /= 64;

				buf[0] = image.colorTable[i].c_color[7];
				buf[1] = image.colorTable[i].c_color[8];
				buf[2] = image.colorTable[i].c_color[9];
				blue = strtol(buf,NULL,16);
				blue /= 64;
				break;
			case 13:
				buf[4] = '\0';
				buf[0] = image.colorTable[i].c_color[1];
				buf[1] = image.colorTable[i].c_color[2];
				buf[2] = image.colorTable[i].c_color[3];
				buf[3] = image.colorTable[i].c_color[4];
				red = strtol(buf,NULL,16);
				red /= 256;

				buf[0] = image.colorTable[i].c_color[5];
				buf[1] = image.colorTable[i].c_color[6];
				buf[2] = image.colorTable[i].c_color[7];
				buf[3] = image.colorTable[i].c_color[8];
				green = strtol(buf,NULL,16);
				green /= 256;

				buf[0] = image.colorTable[i].c_color[9];
				buf[1] = image.colorTable[i].c_color[10];
				buf[2] = image.colorTable[i].c_color[11];
				buf[3] = image.colorTable[i].c_color[12];
				blue = strtol(buf,NULL,16);
				blue /= 256;
				break;
			}


		colors[i] = gdImageColorResolve(im,red,green,blue);
		if (colors[i] == -1)
			fprintf(stderr,"ARRRGH\n");
		}

	apixel = (char *)malloc(image.cpp+1);
	if (apixel == NULL)
		return(0);
	apixel[image.cpp] = '\0';

	pointer = image.data;
	for(i=0;i<image.height;i++)
		{
		for(j=0;j<image.width;j++)
			{
			k = *pointer++;
			gdImageSetPixel(im,j,i,colors[k]);
			}
		}
	free(apixel);
	free(colors);
	return(im);
	}
#endif