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[ewmh] Use premul alpha for net_wm_icons

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Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
Julien Danjou 2008-03-26 10:26:08 +01:00
parent 89f4e22255
commit 0a9b206fc0
1 changed files with 7 additions and 6 deletions
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13
ewmh.c
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@ -358,10 +358,11 @@ ewmh_check_client_hints(Client *c)
NetWMIcon *
ewmh_get_window_icon(Window w)
{
double alpha;
NetWMIcon *icon;
Atom type;
int format, size, i;
unsigned long items, rest, *data, pixel;
unsigned long items, rest, *data;
unsigned char *imgdata, *wdata;
if(XGetWindowProperty(globalconf.display, w,
@ -394,11 +395,11 @@ ewmh_get_window_icon(Window w)
icon->image = p_new(unsigned char, size * 4);
for(imgdata = icon->image, i = 2; i < size + 2; i++, imgdata += 4)
{
pixel = data[i];
imgdata[3] = (pixel >> 24) & 0xff; /* A */
imgdata[2] = (pixel >> 16) & 0xff; /* R */
imgdata[1] = (pixel >> 8) & 0xff; /* G */
imgdata[0] = pixel & 0xff; /* B */
imgdata[3] = (data[i] >> 24) & 0xff; /* A */
alpha = imgdata[3] / 255.0;
imgdata[2] = ((data[i] >> 16) & 0xff) * alpha; /* R */
imgdata[1] = ((data[i] >> 8) & 0xff) * alpha; /* G */
imgdata[0] = (data[i] & 0xff) * alpha; /* B */
}
XFree(wdata);