m + beginning of gamma

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

1 files changed, 75 insertions, 0 deletions

diff --git a/src/drmgamma.h b/src/drmgamma.h
new file mode 100644
index 0000000..7044fd7
--- /dev/null
+++ b/src/drmgamma.h
@@ -0,0 +1,75 @@
+/**
+ * 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/>.
+ */
+#ifndef CRT_CALIBRATOR_DRMGAMMA_H
+#define CRT_CALIBRATOR_DRMGAMMA_H
+
+
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+
+/**
+ * Graphics card information
+ */
+typedef struct drm_card
+{
+  /**
+   * File descriptor for the connection to the graphics card,
+   * -1 if not opened
+   */
+  int fd;
+  
+  /**
+   * The graphics card's mode resources, `NULL` if not acquired
+   */
+  drmModeRes* restrict res;
+  
+  /**
+   * The number of CRTC:s available on the graphics card
+   */
+  size_t crtc_count;
+  
+} drm_card_t;
+
+
+/**
+ * Figure out how many graphics cards there are on the system
+ * 
+ * @return  The number of graphics cards on the system
+ */
+size_t drm_card_count(void);
+
+/**
+ * Acquire access to a graphics card
+ * 
+ * @param   index  The index of the graphics card
+ * @param   card   Graphics card information to fill in
+ * @return         Zero on success, -1 on error
+ */
+int drm_card_open(size_t index, drm_card_t* restrict card);
+
+/**
+ * Release access to a graphics card
+ * 
+ * @param  card  The graphics card information
+ */
+void drm_card_close(drm_card_t* restrict card);
+
+
+#endif
+