2 * _NET_WM_ICON helpers for slide puzzle game
3 * Copyright © 2022 Nick Bowler
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <https://www.gnu.org/licenses/>.
24 #if !X_DISPLAY_MISSING
25 # include <X11/Intrinsic.h>
26 # include <X11/Xatom.h>
31 static unsigned long scale16to8(unsigned x)
33 return x*0xfful / 0xffff;
36 static unsigned long wm_pixel(const XColor *c)
39 | scale16to8(c->red) << 16
40 | scale16to8(c->green) << 8
41 | scale16to8(c->blue);
44 static void format_row(unsigned long *row, const XColor *c,
45 unsigned s, unsigned y, unsigned w, unsigned h)
49 for (x = 0; x < w; x++) {
50 row[x] = wm_pixel(&c[COLOUR_PRIMARY]);
52 row[x] = wm_pixel(&c[COLOUR_LIGHT]);
53 if ((x+s >= w && x+y >= w) || (y+s >= h && x+y >= h))
54 row[x] = wm_pixel(&c[COLOUR_DARK]);
59 * The 16x16 icon is drawn with 1px shadow, 6x6 tiles, with 1 pixel cropped off
62 void ewmh_tile16(unsigned long *icon, const XColor *c, int tile_x, int tile_y)
64 int out_x, out_y, out_w, y;
67 out_x = tile_x * 11 / 2;
68 out_y = tile_y * 11 / 2;
69 out_w = (5 + (tile_x == 1)) * sizeof row[0];
71 for (y = 0+(tile_y == 0); y < 6-(tile_y == 2); y++) {
72 format_row(row, c, 1, y, 6, 6);
73 memcpy(&icon[16 * out_y++ + out_x], &row[tile_x == 0], out_w);
78 * The 24x24 icon is drawn with 1px shadow and 8x8 tiles.
80 void ewmh_tile24(unsigned long *icon, const XColor *c, int tile_x, int tile_y)
88 for (y = 0; y < 8; y++) {
89 format_row(row, c, 1, y, 8, 8);
90 memcpy(&icon[24 * out_y++ + out_x], row, sizeof row);
95 * The 32x32 icon is drawn with 1px shadow with slightly uneven tiles on
96 * an 11-10-11 pixel grid.
98 void ewmh_tile32(unsigned long *icon, const XColor *c, int tile_x, int tile_y)
100 int out_x, out_y, out_w, out_h, y;
101 unsigned long row[11];
103 out_x = 10*tile_x + (tile_x > 0);
104 out_y = 10*tile_y + (tile_y > 0);
105 out_w = 10 + (tile_x != 1);
106 out_h = 10 + (tile_y != 1);
108 for (y = 0; y < out_h; y++) {
109 format_row(row, c, 1, y, out_w, out_h);
110 memcpy(&icon[32 * out_y++ + out_x], row, out_w * sizeof row[0]);
115 * The 48x48 icon is drawn with 2px shadow and 16x16 tiles.
117 void ewmh_tile48(unsigned long *icon, const XColor *c, int tile_x, int tile_y)
120 unsigned long row[16];
125 for (y = 0; y < 16; y++) {
126 format_row(row, c, 2, y, 16, 16);
127 memcpy(&icon[48 * out_y++ + out_x], row, sizeof row);
131 void *ewmh_icon_alloc(unsigned long **sizes)
135 buf = calloc(sizeof *buf, EWMH_ICON_NELEM);
137 sizes[ICON_16x16] = buf;
138 *sizes[ICON_16x16]++ = 16;
139 *sizes[ICON_16x16]++ = 16;
141 sizes[ICON_24x24] = sizes[ICON_16x16] + 16*16;
142 *sizes[ICON_24x24]++ = 24;
143 *sizes[ICON_24x24]++ = 24;
145 sizes[ICON_32x32] = sizes[ICON_24x24] + 24*24;
146 *sizes[ICON_32x32]++ = 32;
147 *sizes[ICON_32x32]++ = 32;
149 sizes[ICON_48x48] = sizes[ICON_32x32] + 32*32;
150 *sizes[ICON_48x48]++ = 48;
151 *sizes[ICON_48x48]++ = 48;
157 #if !X_DISPLAY_MISSING
160 * EWMH-supporting window managers that handle _NET_WM_ICON add this atom to
161 * the _NET_SUPPORTED list on the root window. Look for that and return 1
162 * if it is found, or 0 otherwise.
164 int ewmh_probe_wm_icon(Widget shell)
166 Display *display = XtDisplay(shell);
167 Screen *screen = XtScreen(shell);
168 Window root = RootWindowOfScreen(screen);
169 Atom net_supported, net_wm_icon, type;
171 unsigned long offset = 0, i, nitems, bytes_after, *props;
172 unsigned char *prop_return;
175 net_wm_icon = XInternAtom(display, "_NET_WM_ICON", 0);
176 net_supported = XInternAtom(display, "_NET_SUPPORTED", 0);
178 XGetWindowProperty(display, root, net_supported, offset, 10,
179 0, XA_ATOM, &type, &format,
180 &nitems, &bytes_after,
183 if (format != 32 || type != XA_ATOM)
187 props = (void *)prop_return;
188 for (i = 0; i < nitems; i++) {
189 if (props[i] == net_wm_icon) {
193 } while (nitems > 0 && bytes_after > 0);