basic screen, output and crtc listing with physical size and connection status

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

1 files changed, 171 insertions, 0 deletions

diff --git a/src/blueshift_crtc_c.c b/src/blueshift_crtc_c.c
new file mode 100644
index 0000000..a874f5e
--- /dev/null
+++ b/src/blueshift_crtc_c.c
@@ -0,0 +1,171 @@
+/**
+ * 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 Affero 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 Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+#include <xcb/xcb.h>
+#include <xcb/randr.h>
+
+
+
+/**
+ * The major version of RANDR the program expects
+ */
+#define RANDR_VERSION_MAJOR  1U
+
+/**
+ * The minor version of RANDR the program expects
+ */
+#define RANDR_VERSION_MINOR  3U
+
+
+
+/**
+ * Connection to the X server
+ */
+static xcb_connection_t* connection;
+
+/**
+ * Used to store errors in
+ */
+static xcb_generic_error_t* error;
+
+
+int main(int argc __attribute__((unused)), char** argv __attribute__((unused)))
+{
+  xcb_randr_query_version_cookie_t version_cookie;
+  xcb_randr_query_version_reply_t* randr_version;
+  const xcb_setup_t* setup;
+  xcb_screen_iterator_t iter;
+  int screen_count;
+  xcb_screen_t* screens;
+  int screen_i;
+  
+  
+  /* Get X connection */
+  
+  connection = xcb_connect(NULL, NULL);
+  
+  
+  /* Check RANDR protocol version */
+  
+  version_cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
+  randr_version = xcb_randr_query_version_reply(connection, version_cookie, &error);
+  
+  if (error || (randr_version == NULL))
+    {
+      fprintf(stderr, "RANDR version query returned %i", error ? error->error_code : -1);
+      xcb_disconnect(connection);
+      return 1;
+    }
+  
+  if (randr_version->major_version != RANDR_VERSION_MAJOR || randr_version->minor_version < RANDR_VERSION_MINOR)
+    {
+      fprintf(stderr, "Unsupported RANDR version, got %u.%u, expected %u.%u\n",
+	      randr_version->major_version, randr_version->minor_version,
+	      RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
+      free(randr_version);
+      xcb_disconnect(connection);
+      return 1;
+    }
+  
+  free(randr_version);
+  
+  
+  /* Get screen information */
+  
+  setup = xcb_get_setup(connection);
+  iter = xcb_setup_roots_iterator(setup);
+  screen_count = iter.rem;
+  screens = iter.data;
+  
+  printf("Screen count: %i\n", screen_count);
+  for (screen_i = 0; screen_i < screen_count; screen_i++)
+    {
+      xcb_screen_t* screen = screens + screen_i;
+      xcb_randr_get_screen_resources_current_cookie_t res_cookie;
+      xcb_randr_get_screen_resources_current_reply_t* res_reply;
+      xcb_randr_output_t* outputs;
+      xcb_randr_crtc_t* crtcs;
+      int output_i;
+      
+      printf("Screen: %i\n", screen_i);
+      
+      res_cookie = xcb_randr_get_screen_resources_current(connection, screen->root);
+      res_reply = xcb_randr_get_screen_resources_current_reply(connection, res_cookie, &error);
+      
+      if (error)
+	{
+	  fprintf(stderr, "RANDR screen resource query returned %i\n", error->error_code);
+	  xcb_disconnect(connection);
+	  return 1;
+	}
+      
+      printf("  CRTC count: %i\n", res_reply->num_crtcs);
+      printf("  Output count: %i\n", res_reply->num_outputs);
+      
+      outputs = xcb_randr_get_screen_resources_current_outputs(res_reply);
+      crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply);
+      for (output_i = 0; output_i < res_reply->num_outputs; output_i++)
+        {
+	  xcb_randr_get_output_info_cookie_t out_cookie;
+	  xcb_randr_get_output_info_reply_t* out_reply;
+	  
+	  out_cookie = xcb_randr_get_output_info(connection, outputs[output_i], res_reply->config_timestamp);
+	  out_reply = xcb_randr_get_output_info_reply(connection, out_cookie, &error);
+	  
+	  if (error)
+	    {
+	      fprintf(stderr, "RANDR output query returned %i\n", error->error_code);
+	      xcb_disconnect(connection);
+	      return 1;
+	    }
+	  
+	  printf("  Output: %i\n", output_i);
+	  switch (out_reply->connection)
+	    {
+	    case XCB_RANDR_CONNECTION_CONNECTED:
+	      {
+		int crtc_i;
+		printf("    Connection: connected\n");
+		printf("    Size: %i %i\n", out_reply->mm_width, out_reply->mm_height);
+		for (crtc_i = 0; crtc_i < res_reply->num_crtcs; crtc_i++)
+		  if (crtcs[crtc_i] == out_reply->crtc)
+		    printf("    CRTC: %i\n", crtc_i);
+	      }
+	      break;
+	    case XCB_RANDR_CONNECTION_DISCONNECTED:
+	      printf("    Connection: disconnected\n");
+	      break;
+	    case XCB_RANDR_CONNECTION_UNKNOWN:
+	    default:
+	      printf("    Connection: unknown\n");
+	      break;
+	    }
+	}
+      
+      free(res_reply);
+    }
+  
+  
+  /* Free resources **/
+  
+  xcb_disconnect(connection);
+  return 0;
+}
+