draw bars used to configure contrast and brightness

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/src/calibrator.c b/src/calibrator.c
new file mode 100644
index 0000000..735d929
--- /dev/null
+++ b/src/calibrator.c
@@ -0,0 +1,65 @@
+/**
+ * crt-calibrator – Calibration utility for CRT monitors
+ * 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 "calibrator.h"
+
+#include "framebuffer.h"
+#include "drmgamma.h"
+#include "gamma.h"
+
+#include <stdio.h>
+
+
+static const int CONTRAST_BRIGHTNESS_LEVELS[21] =
+  {
+    0, 17, 27, 38, 48, 59, 70, 82, 94, 106, 119, 131,
+    144, 158, 171, 185, 198, 212, 226, 241, 255
+  };
+
+
+int main(int argc __attribute__((unused)), char* argv[])
+{
+  size_t f, y, x, fn = fb_count();
+  for (f = 0; f < fn; f++)
+    {
+      framebuffer_t fb;
+      if (fb_open(f, &fb) < 0)
+	goto fail;
+      
+      for (y = 0; y < 4; y++)
+	for (x = 0; x < 21; x++)
+	  {
+	    int v = CONTRAST_BRIGHTNESS_LEVELS[x];
+	    uint32_t colour = fb_colour(v * ((y == 1) | (y == 0)),
+					v * ((y == 2) | (y == 0)),
+					v * ((y == 3) | (y == 0)));
+	    fb_fill_rectangle(&fb, colour,
+			      x * fb.width / 21,
+			      y * fb.height / 4,
+			      (x + 1) * fb.width / 21 - x * fb.width / 21,
+			      (y + 1) * fb.height / 4 - y * fb.height / 4);
+	  }
+      
+      fb_close(&fb);
+    }
+  
+  return 0;
+ fail:
+  perror(*argv);
+  return 1;
+}
+