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authorMattias Andrée <maandree@operamail.com>2014-11-08 03:41:41 +0100
committerMattias Andrée <maandree@operamail.com>2014-11-08 03:41:41 +0100
commit94ca8b79d10e946149823b521167321d41045667 (patch)
tree06456dea55866a2ed954a1dc89ac52a7c2eca6a1 /src
parentread is much faster than mmap (diff)
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add support for x
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src')
-rw-r--r--src/x.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/src/x.c b/src/x.c
new file mode 100644
index 0000000..4289c06
--- /dev/null
+++ b/src/x.c
@@ -0,0 +1,74 @@
+/**
+ * get-luminosity — Determine how bright it is in your room
+ * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "linearise.h"
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <pthread.h>
+
+
+static Display* restrict display;
+
+
+static double get_brightness(int screen)
+{
+ auto Window root = XRootWindow(display, screen);
+ auto long width = (long)XDisplayWidth(display, screen);
+ auto long height = (long)XDisplayHeight(display, screen);
+ auto XImage* restrict image = XGetImage(display, root, 0, 0, width, height, AllPlanes, ZPixmap);
+ register double sum = 0;
+ register unsigned char* restrict pixels;
+ register unsigned char* restrict end;
+
+ if (image == NULL)
+ return -1;
+
+ pixels = (unsigned char*)(image->data);
+ end = pixels + width * height * 4;
+
+ while (pixels != end)
+ {
+ sum += LINEAR_MAP[*pixels++];
+ sum += LINEAR_MAP[*pixels++];
+ sum += LINEAR_MAP[*pixels++];
+ pixels++;
+ }
+
+ XDestroyImage(image);
+ return sum / (double)(height * width * 3);
+}
+
+
+int main(void)
+{
+ int screen, screens;
+
+ if (display = XOpenDisplay(NULL), display == NULL)
+ return 1;
+
+ screens = (size_t)ScreenCount(display);
+ for (screen = 0; screen < screens; screen++)
+ fprintf(stderr, "%lf\n", get_brightness(screen));
+
+ XCloseDisplay(display);
+ return 0;
+}
+