AmbiLightΒΆ
Fast screenshot capture program that calculates the dominant color (average of colors with high hue) visible on the screen and sets it as the only color of the keyboard. Is capable of reaching somewhere between 20 and 30 FPS on most machines.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 | /**
* Author: RedFantom
* License: GNU GPLv3
* Copyright (c) 2018-2019 RedFantom
*/
#include "libmk.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <pthread.h>
#include <time.h>
#include <X11/Xlib.h>
#include <X11/X.h>
#define MAX_WIDTH -1 // 0: Full width, -1: / 2, n_pixels otherwise
#define SATURATION_BIAS 60
#define BRIGHTNESS_NORM
#define UPPER_TRESHOLD 700
#define LOWER_TRESHOLD 25
bool exit_requested = false;
unsigned char target_color[3] = {0};
pthread_mutex_t exit_req_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t target_color_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t keyboard_lock = PTHREAD_MUTEX_INITIALIZER;
Display* display;
Window root;
XWindowAttributes gwa;
typedef struct Screenshot {
unsigned char* data;
unsigned int width, height;
} Screenshot;
void interrupt_handler(int signal) {
/** Handle a Control-C command to exit the loop */
pthread_mutex_lock(&exit_req_lock);
exit_requested = true;
pthread_mutex_unlock(&exit_req_lock);
}
int capture_screenshot(Screenshot** screenshot) {
/** Capture a screenshot and store it in an array */
(*screenshot) = (Screenshot*) malloc(sizeof(Screenshot));
int width = gwa.width, height = gwa.height;
(*screenshot)->data = (unsigned char*) malloc(
width * height * 3 * sizeof(unsigned char));
XImage* img = XGetImage(
display, root, 0, 0, width, height, AllPlanes, ZPixmap);
unsigned long rm = img->red_mask, gm = img->green_mask, bm = img->blue_mask;
unsigned long masks[3] = {rm, gm, bm};
unsigned char pixel[3];
for (int x=0; x < width; x++)
for (int y = 0; y < height; y++) {
unsigned long pix = XGetPixel(img, x, y);
for (int i = 0; i < 3; i++)
(*screenshot)->data[(x + width * y) * 3 + i] =
(unsigned char) (pix >> (2 - i) * 8);
}
XDestroyImage(img);
return 0;
}
void* calculate_keyboard_color(void *void_ptr) {
/** Continuously capture screens and calculate the dominant colour
*
* Options are given in defines:
* MAX_WIDTH: If 0, uses full screen width. If -1, uses only the
* first half of the pixel columns for double monitors. Otherwise,
* limited to value of MAX_WIDTH.
* LOWER_THRESHOLD: Minimum summed value of the RGB triplet, used
* for filtering out dark pixels.
* UPPER_THRESHOLD: Maximum summed value of the RGB triplet, used
* for filtering out bright pixels.
* SATURATION_BIAS: Minimum required difference between any pair
* of bytes of the RGB triplet of a pixel.
* BRIGHTNESS_NORM: If defined, target colors sent to the keyboard
* are scaled so that at least one of the RGB values of the
* triplet is the maximum of 255.
*/
Screenshot* screen;
while (true) {
pthread_mutex_lock(&exit_req_lock);
if (exit_requested) {
printf("Exit requested.\n");
pthread_mutex_unlock(&exit_req_lock);
break;
}
pthread_mutex_unlock(&exit_req_lock);
if (capture_screenshot(&screen) < 0) {
int code = -2;
pthread_exit(&code);
}
int w = gwa.width, h = gwa.height;
unsigned char temp[3];
unsigned long colors[3] = {0};
unsigned long n_pixels = 0;
unsigned int sum;
int lim;
if (MAX_WIDTH == 0) {
lim = w;
} else if (MAX_WIDTH == -1) {
lim = w / 2;
} else {
lim = MAX_WIDTH;
}
// Sum
for (int x = 0; x < lim; x++) {
for (int y = 0; y < h; y++) {
sum = 0;
int max_diff = 0;
for (int i = 0; i < 3; i++) {
int first = i, second = i + 1;
if (i == 2)
second = 0;
int diff = screen->data[(x + y * w) * 3 + first] -
screen->data[(x + y * w) * 3 + second];
if (diff > max_diff)
max_diff = diff;
temp[i] = screen->data[(x + y * w) * 3 + i];
sum += temp[i];
}
if (sum < LOWER_TRESHOLD ||
sum > UPPER_TRESHOLD ||
max_diff < SATURATION_BIAS)
continue;
for (int i = 0; i < 3; i++)
colors[i] += temp[i];
n_pixels += 1;
}
}
unsigned char color[3];
unsigned char max = 0;
// Average
for (int i = 0; i < 3; i++) {
if (n_pixels == 0) {
color[i] = 0xFF;
continue;
}
color[i] = (unsigned char) (colors[i] / n_pixels);
if (color[i] > max)
max = color[i];
}
#ifdef BRIGHTNESS_NORM
// Normalize
if (max != 0)
for (int i = 0; i < 3; i++)
color[i] = (unsigned char) ((int) color[i] * (255.0 / max));
#endif
// Copy color over to thread-safe variable
pthread_mutex_lock(&target_color_lock);
for (int i=0; i < 3; i++)
target_color[i] = color[i];
pthread_mutex_unlock(&target_color_lock);
// Clean up
free(screen->data);
free(screen);
}
pthread_exit(0);
}
void* update_keyboard_color(void* ptr) {
unsigned char color[3] = {0}, prev[3] = {0};
while (true) {
pthread_mutex_lock(&exit_req_lock);
if (exit_requested) {
pthread_mutex_unlock(&exit_req_lock);
break;
}
pthread_mutex_unlock(&exit_req_lock);
int diff;
bool equal = true;
pthread_mutex_lock(&target_color_lock);
for (int i=0; i < 3; i++) {
diff = (int) target_color[i] - color[i];
prev[i] = color[i];
color[i] += (unsigned char) (diff / 20.0);
equal = (prev[i] == target_color[i]) && equal;
}
pthread_mutex_unlock(&target_color_lock);
if (equal)
continue;
pthread_mutex_lock(&keyboard_lock);
int r = libmk_set_full_color(NULL, color[0], color[1], color[2]);
if (r != LIBMK_SUCCESS)
printf("LibMK Error: %d\n", r);
pthread_mutex_unlock(&keyboard_lock);
struct timespec time;
time.tv_nsec = 100000000 / 4;
nanosleep(&time, NULL);
}
pthread_exit(0);
}
int main() {
/** Run a loop that grabs a screenshot and updated lighting */
signal(SIGINT, interrupt_handler);
libmk_init();
// Set up libmk
LibMK_Model* devices;
int n = libmk_detect_devices(&devices);
if (n < 0) {
printf("libmk_detect_devices failed: %d\n", n);
return n;
}
libmk_set_device(devices[0], NULL);
libmk_enable_control(NULL);
// Open the XDisplay
display = XOpenDisplay(NULL);
root = DefaultRootWindow(display);
if (XGetWindowAttributes(display, root, &gwa) < 0)
return -1;
pthread_t keyboard, screenshot;
// Run the loop
pthread_create(&screenshot, NULL, calculate_keyboard_color, NULL);
pthread_create(&keyboard, NULL, update_keyboard_color, NULL);
pthread_join(screenshot, NULL);
pthread_join(keyboard, NULL);
// Perform closing actions
libmk_disable_control(NULL);
libmk_exit();
return 0;
}
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