1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* =====================
* ==== ===============
* =====================
* === === ==== ==
* ==== == == = =
* ==== == = == =
* ==== == = == ====
* ==== == = == = =
* = = === ==== ==
* == ================
* =====================
*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2025, joe
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the organization nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* halfcab: src/c_screen.c
* Wed, 24 Sep 2025 20:29:26 +0200
* joe <rbo@gmx.us>
*/
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "c_defines.h"
#include "c_screen.h"
static void
fill_led
(unsigned char leds[],
const int i,
Display* disp,
XImage* img,
const int min_x,
const int max_x,
const int min_y,
const int max_y)
{
XColor c;
(void)min_x;
(void)max_x;
(void)min_y;
(void)max_y;
c.pixel = XGetPixel(img, 0, 0);
XQueryColor(disp, DefaultColormap(disp, DefaultScreen(disp)), &c);
leds[i + 0] = c.red;
leds[i + 1] = c.green;
leds[i + 2] = c.blue;
}
void
c_get_screen_colors
(unsigned char leds[],
Display* disp)
{
XImage* img;
const int top_leds = NUM_LEDS / 2;
const int side_leds = NUM_LEDS / 4;
const int top_px_per_led = SCREEN_W / top_leds;
const int side_px_per_led = SCREEN_H / side_leds;
int i;
img = XGetImage(
disp, RootWindow(disp, DefaultScreen(disp)),
1920, 0,
SCREEN_W, SCREEN_H,
AllPlanes, ZPixmap
);
if (img == NULL) {
return;
}
i = 0;
fill_led(
leds, i,
disp, img,
0, side_px_per_led,
VERT_PIXEL_GAP + (0 * side_px_per_led),
VERT_PIXEL_GAP + ((0 + 1) * side_px_per_led)
);
(void)top_px_per_led;
XDestroyImage(img);
}
|
