add blueshift_drm_set_gamma_ramps

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

1 files changed, 20 insertions, 3 deletions

diff --git a/src/blueshift_drm_c.c b/src/blueshift_drm_c.c
index 4e8c750..fd11be1 100644
--- a/src/blueshift_drm_c.c
+++ b/src/blueshift_drm_c.c
@@ -274,7 +274,7 @@ const char* blueshift_drm_get_connector_type_name()
 
 
 /**
- * Get the current gamma ramps of the 
+ * Get the current gamma ramps of the monitor connected to the connector
  * 
  * @param   crtc_index  The index of the CRTC to read from
  * @param   gamma_size  The size a gamma ramp
@@ -295,6 +295,24 @@ int blueshift_drm_get_gamma_ramps(int crtc_index, int gamma_size, uint16_t* red,
 }
 
 
+/* Fails if inside a graphical environment */
+
+/**
+ * Set the gamma ramps of the of the monitor connected to the connector
+ * 
+ * @param   crtc_index  The index of the CRTC to read from
+ * @param   gamma_size  The size a gamma ramp
+ * @param   red         The red gamma ramp
+ * @param   green       The green gamma ramp
+ * @param   blue        The blue gamma ramp
+ * @return              Zero on success
+ */
+int blueshift_drm_set_gamma_ramps(int crtc_index, int gamma_size, uint16_t* red, uint16_t* green, uint16_t* blue)
+{
+  return drmModeCrtcSetGamma(drm_fd, *(drm_res->crtcs + crtc_index), gamma_size, red, green, blue);
+}
+
+
 /**
  * Get the extended display identification data for the monitor connected to the connector
  * 
@@ -430,8 +448,7 @@ int main(int argc, char** argv)
 		      for (j = 0; j < gamma_size; j++)
 			*(blue + j) /= 2;
 		      
-		      drmModeCrtcSetGamma(drm_fd, *(drm_res->crtcs + crtc), gamma_size, red, green, blue);
-		      /* Fails if inside a graphical environment */
+		      blueshift_drm_set_gamma_ramps(crtc, gamma_size, red, green, blue);
 		    }
 		}
 	    }