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#include <gd.h>
void
setnetwmicon(void)
{
/* use a png-image to set _NET_WM_ICON */
FILE* file = fopen(ICON, "r");
if (file) {
/* load image in rgba-format */
const gdImagePtr icon_rgba = gdImageCreateFromPng(file);
fclose(file);
/* declare icon-variable which will store the image in bgra-format */
const int width = gdImageSX(icon_rgba);
const int height = gdImageSY(icon_rgba);
const int icon_n = width * height + 2;
long icon_bgra[icon_n];
/* set width and height of the icon */
int i = 0;
icon_bgra[i++] = width;
icon_bgra[i++] = height;
/* rgba -> bgra */
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
const int pixel_rgba = gdImageGetPixel(icon_rgba, x, y);
unsigned char *pixel_bgra = (unsigned char *) &icon_bgra[i++];
pixel_bgra[0] = gdImageBlue(icon_rgba, pixel_rgba);
pixel_bgra[1] = gdImageGreen(icon_rgba, pixel_rgba);
pixel_bgra[2] = gdImageRed(icon_rgba, pixel_rgba);
/* scale alpha from 0-127 to 0-255 */
const unsigned char alpha = 127 - gdImageAlpha(icon_rgba, pixel_rgba);
pixel_bgra[3] = alpha == 127 ? 255 : alpha * 2;
}
}
gdImageDestroy(icon_rgba);
/* set _NET_WM_ICON */
xw.netwmicon = XInternAtom(xw.dpy, "_NET_WM_ICON", False);
XChangeProperty(xw.dpy, xw.win, xw.netwmicon, XA_CARDINAL, 32,
PropModeReplace, (uchar *) icon_bgra, icon_n);
}
}
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