st/patch/background_image_x.c

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2022-03-10 10:37:49 +00:00
void
updatexy()
{
Window child;
XTranslateCoordinates(xw.dpy, xw.win, DefaultRootWindow(xw.dpy), 0, 0, &win.x, &win.y, &child);
}
/*
* load farbfeld file to XImage
*/
XImage*
loadff(const char *filename)
{
uint32_t i, hdr[4], w, h, size;
uint64_t *data;
FILE *f = fopen(filename, "rb");
if (f == NULL) {
fprintf(stderr, "could not load background image.\n");
return NULL;
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}
if (fread(hdr, sizeof(*hdr), LEN(hdr), f) != LEN(hdr)) {
fprintf(stderr, "fread: %s\n", ferror(f) ? "" : "Unexpected end of file reading header");
fclose(f);
return NULL;
}
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if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) {
fprintf(stderr, "Invalid magic value\n");
fclose(f);
return NULL;
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}
w = ntohl(hdr[2]);
h = ntohl(hdr[3]);
size = w * h;
data = xmalloc(size * sizeof(uint64_t));
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if (fread(data, sizeof(uint64_t), size, f) != size) {
fprintf(stderr, "fread: %s\n", ferror(f) ? "" : "Unexpected end of file reading data");
fclose(f);
return NULL;
}
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fclose(f);
for (i = 0; i < size; i++)
data[i] = (data[i] & 0x00000000000000FF) << 16 |
(data[i] & 0x0000000000FF0000) >> 8 |
(data[i] & 0x000000FF00000000) >> 32 |
(data[i] & 0x00FF000000000000) >> 24;
#if ALPHA_PATCH
XImage *xi = XCreateImage(xw.dpy, xw.vis, xw.depth, ZPixmap, 0,
(char *)data, w, h, 32, w * 8);
#else
XImage *xi = XCreateImage(xw.dpy, DefaultVisual(xw.dpy, xw.scr),
DefaultDepth(xw.dpy, xw.scr), ZPixmap, 0,
(char *)data, w, h, 32, w * 8);
#endif // ALPHA_PATCH
xi->bits_per_pixel = 64;
return xi;
}
/*
* initialize background image
*/
void
bginit()
{
XGCValues gcvalues;
Drawable bgimg;
XImage *bgxi = loadff(bgfile);
memset(&gcvalues, 0, sizeof(gcvalues));
xw.bggc = XCreateGC(xw.dpy, xw.win, 0, &gcvalues);
if (!bgxi)
return;
#if ALPHA_PATCH
bgimg = XCreatePixmap(xw.dpy, xw.win, bgxi->width, bgxi->height,
xw.depth);
#else
bgimg = XCreatePixmap(xw.dpy, xw.win, bgxi->width, bgxi->height,
DefaultDepth(xw.dpy, xw.scr));
#endif // ALPHA_PATCH
XPutImage(xw.dpy, bgimg, dc.gc, bgxi, 0, 0, 0, 0, bgxi->width, bgxi->height);
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XDestroyImage(bgxi);
XSetTile(xw.dpy, xw.bggc, bgimg);
XSetFillStyle(xw.dpy, xw.bggc, FillTiled);
if (pseudotransparency) {
updatexy();
MODBIT(xw.attrs.event_mask, 1, PropertyChangeMask);
XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
}
}