misc

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 55 insertions, 0 deletions

diff --git a/libgamma_x_vidmode_get_crtc_information.c b/libgamma_x_vidmode_get_crtc_information.c
new file mode 100644
index 0000000..8462b1b
--- /dev/null
+++ b/libgamma_x_vidmode_get_crtc_information.c
@@ -0,0 +1,55 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Read information about a CRTC
+ * 
+ * @param   this    Instance of a data structure to fill with the information about the CRTC
+ * @param   crtc    The state of the CRTC whose information should be read
+ * @param   fields  OR:ed identifiers for the information about the CRTC that should be read
+ * @return          Zero on success, -1 on error; oOn error refer to the error reports in `this`
+ */
+int
+libgamma_x_vidmode_get_crtc_information(libgamma_crtc_information_t *restrict this,
+                                        libgamma_crtc_state_t *restrict crtc, int32_t fields)
+{
+#define _E(FIELD)  ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0)
+
+	Display *restrict connection;
+	int stops = 0;
+
+	/* X VidMode does not support EDID or monitor dimensions */
+	this->edid_error = _E(LIBGAMMA_CRTC_INFO_EDID);
+	this->width_mm_error = _E(LIBGAMMA_CRTC_INFO_WIDTH_MM);
+	this->height_mm_error = _E(LIBGAMMA_CRTC_INFO_HEIGHT_MM);
+	this->width_mm_edid_error = _E(LIBGAMMA_CRTC_INFO_WIDTH_MM_EDID);
+	this->height_mm_edid_error = _E(LIBGAMMA_CRTC_INFO_HEIGHT_MM_EDID);
+	this->gamma_size_error = 0;
+	/* X VidMode does support gamma ramp size query. The gamma
+	   ramps are identical but not fixed, and the query can fail. */
+	if ((fields & LIBGAMMA_CRTC_INFO_GAMMA_SIZE)) {
+		connection = crtc->partition->site->data;
+		if (!XF86VidModeGetGammaRampSize(connection, (int)crtc->partition->partition, &stops))
+			this->gamma_size_error = LIBGAMMA_GAMMA_RAMPS_SIZE_QUERY_FAILED;
+		else if (stops < 2)
+			this->gamma_size_error = LIBGAMMA_SINGLETON_GAMMA_RAMP;
+		this->red_gamma_size = this->green_gamma_size = this->blue_gamma_size = (size_t)stops;
+	}
+	/* X VidMode uses 16-bit integer ramps */
+	this->gamma_depth = 16;
+	this->gamma_depth_error = 0;
+	/* X VidMode does not support gamma ramp support queries */
+	this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT);
+	/* X VidMode does not support EDID or connector information */
+	this->subpixel_order_error = _E(LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER);
+	this->active_error = _E(LIBGAMMA_CRTC_INFO_ACTIVE);
+	this->connector_name_error = _E(LIBGAMMA_CRTC_INFO_CONNECTOR_NAME);
+	this->connector_type_error = _E(LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE);
+	this->gamma_error = _E(LIBGAMMA_CRTC_INFO_GAMMA);
+
+	/* We failed if gamma ramp size query failed or if an unsupport field was queried. */
+	return (this->gamma_size_error || (fields & ~(LIBGAMMA_CRTC_INFO_GAMMA_DEPTH | LIBGAMMA_CRTC_INFO_GAMMA_SIZE))) ? -1 : 0;
+
+#undef _E
+}