From 1ce2b99c24feccc0edfe55ca3cfc82c8f044622e Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Fri, 23 May 2014 18:48:33 +0200
Subject: gamma-x-randr: partition init
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
 src/gamma-x-randr.c  | 53 ++++++++++++++++++++++++++++++++++++++++++++++++----
 src/libgamma-error.h | 12 +++++++++++-
 2 files changed, 60 insertions(+), 5 deletions(-)

diff --git a/src/gamma-x-randr.c b/src/gamma-x-randr.c
index 8a63d67..105d4fc 100644
--- a/src/gamma-x-randr.c
+++ b/src/gamma-x-randr.c
@@ -159,16 +159,20 @@ int libgamma_x_randr_site_initialise(libgamma_site_state_t* restrict this,
 #endif
       free(reply);
       xcb_disconnect(connection);
-      return LIBGAMMA_PROTOCOL_VERSION_NOT_SUPPORTED;;
+      return LIBGAMMA_PROTOCOL_VERSION_NOT_SUPPORTED;
     }
   
   free(reply);
   
-  setup = xcb_get_setup(connection);
+  if ((setup = xcb_get_setup(connection)) == NULL)
+    {
+      xcb_disconnect(connection);
+      return LIBGAMMA_LIST_PARTITIONS_FAILED;
+    }
   iter = xcb_setup_roots_iterator(setup);
   this->partitions_available = (size_t)(iter.rem);
   
-  return 0;
+  return iter.rem < 0 ? LIBGAMMA_NEGATIVE_PARTITION_COUNT : 0;
 }
 
 
@@ -210,7 +214,48 @@ int libgamma_x_randr_site_restore(libgamma_site_state_t* restrict this)
 int libgamma_x_randr_partition_initialise(libgamma_partition_state_t* restrict this,
 					  libgamma_site_state_t* restrict site, size_t partition)
 {
-  /* TODO */
+  xcb_connection_t* restrict connection = site->data;
+  const xcb_setup_t* setup = xcb_get_setup(connection);
+  xcb_screen_t* screen = NULL;
+  xcb_generic_error_t* error = NULL;
+  xcb_screen_iterator_t iter;
+  xcb_randr_get_screen_resources_current_cookie_t cookie;
+  xcb_randr_get_screen_resources_current_reply_t* restrict reply;
+  xcb_randr_crtc_t* restrict crtcs;
+  size_t i;
+  
+  if (setup == NULL)
+    return LIBGAMMA_LIST_PARTITIONS_FAILED;
+  
+  for (i = 0; iter.rem > 0; i++, xcb_screen_next(&iter))
+    if (i == partition)
+      {
+	screen = iter.data;
+	break;
+      }
+  if (iter.rem == 0)
+    return LIBGAMMA_NO_SUCH_PARTITION;
+  
+  if (screen == NULL)
+    return LIBGAMMA_NULL_PARTITION;
+  
+  cookie = xcb_randr_get_screen_resources_current(connection, screen->root);
+  reply = xcb_randr_get_screen_resources_current_reply(connection, cookie, &error);
+  if (error != NULL)
+    return translate_error(error->error_code, LIBGAMMA_LIST_CRTCS_FAILED);
+  
+  this->crtcs_available = reply->num_crtcs;
+  crtcs = xcb_randr_get_screen_resources_current_crtcs(reply);
+  /* Copy the CRTC:s, just so we do not have to keep the reply in memory. */
+  this->data = malloc(reply->num_crtcs * sizeof(xcb_randr_crtc_t));
+  if (this->data == NULL)
+    {
+      free(reply);
+      return LIBGAMMA_ERRNO_SET;
+    }
+  memcpy(this->data, crtcs, reply->num_crtcs * sizeof(xcb_randr_crtc_t));
+  free(reply);
+  return 0;
 }
 
 
diff --git a/src/libgamma-error.h b/src/libgamma-error.h
index 6e3b102..87eb4ac 100644
--- a/src/libgamma-error.h
+++ b/src/libgamma-error.h
@@ -237,6 +237,16 @@ extern const char* libgamma_group_name;
  */
 #define LIBGAMMA_PROTOCOL_VERSION_NOT_SUPPORTED  (-38)
 
+/**
+ * The adjustment method failed to list available partitions, reason unknown
+ */
+#define LIBGAMMA_LIST_PARTITIONS_FAILED  (-39)
+
+/**
+ * Partition exists by index, but the partition at that index does not exist
+ */
+#define LIBGAMMA_NULL_PARTITION  (-40)
+
 
 
 /**
@@ -244,7 +254,7 @@ extern const char* libgamma_group_name;
  * If this is lower than the number your program thinks it
  * should be sould update your program for new errors.
  */
-#define LIBGAMMA_ERROR_MIN  (-38)
+#define LIBGAMMA_ERROR_MIN  (-40)
 
 
 
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