[gnome-flashback] backends: add GfLogicalMonitorConfig

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 79347d1cde86c45ba3ec52bc5602b385728ff1c6
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Sep 20 18:19:51 2017 +0300

    backends: add GfLogicalMonitorConfig

 backends/Makefile.am                         |    2 +
 backends/gf-logical-monitor-config-private.h |   49 ++++++++++++
 backends/gf-logical-monitor-config.c         |  105 ++++++++++++++++++++++++++
 backends/gf-logical-monitor-private.h        |    1 +
 backends/gf-monitor-config-manager-private.h |   10 ---
 backends/gf-monitor-manager-private.h        |    6 ++
 6 files changed, 163 insertions(+), 10 deletions(-)
---
diff --git a/backends/Makefile.am b/backends/Makefile.am
index cd5621c..1eeb37b 100644
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -33,6 +33,8 @@ libbackends_la_SOURCES = \
        gf-display-config-shared.h \
        gf-edid-parse.c \
        gf-edid-private.h \
+       gf-logical-monitor-config-private.h \
+       gf-logical-monitor-config.c \
        gf-logical-monitor-private.h \
        gf-logical-monitor.c \
        gf-monitor-config-manager-private.h \
diff --git a/backends/gf-logical-monitor-config-private.h b/backends/gf-logical-monitor-config-private.h
new file mode 100644
index 0000000..618e9ef
--- /dev/null
+++ b/backends/gf-logical-monitor-config-private.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2016 Red Hat
+ * Copyright (C) 2017 Alberts Muktupāvels
+ *
+ * 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/>.
+ *
+ * Adapted from mutter:
+ * - src/backends/meta-monitor-config-manager.h
+ */
+
+#ifndef GF_LOGICAL_MONITOR_CONFIG_PRIVATE_H
+#define GF_LOGICAL_MONITOR_CONFIG_PRIVATE_H
+
+#include "gf-monitor-manager-private.h"
+#include "gf-rectangle.h"
+
+G_BEGIN_DECLS
+
+typedef struct
+{
+  GfRectangle         layout;
+  GList              *monitor_configs;
+  GfMonitorTransform  transform;
+  gfloat              scale;
+  gboolean            is_primary;
+  gboolean            is_presentation;
+} GfLogicalMonitorConfig;
+
+void     gf_logical_monitor_config_free   (GfLogicalMonitorConfig      *config);
+
+gboolean gf_verify_logical_monitor_config (GfLogicalMonitorConfig      *config,
+                                           GfLogicalMonitorLayoutMode   layout_mode,
+                                           GfMonitorManager            *monitor_manager,
+                                           GError                     **error);
+
+G_END_DECLS
+
+#endif
diff --git a/backends/gf-logical-monitor-config.c b/backends/gf-logical-monitor-config.c
new file mode 100644
index 0000000..6b687ee
--- /dev/null
+++ b/backends/gf-logical-monitor-config.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2016 Red Hat
+ * Copyright (C) 2017 Alberts Muktupāvels
+ *
+ * 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/>.
+ *
+ * Adapted from mutter:
+ * - src/backends/meta-monitor-config-manager.c
+ */
+
+#include "config.h"
+
+#include <math.h>
+
+#include "gf-logical-monitor-config-private.h"
+#include "gf-monitor-config-private.h"
+
+void
+gf_logical_monitor_config_free (GfLogicalMonitorConfig *config)
+{
+  GList *monitor_configs;
+
+  monitor_configs = config->monitor_configs;
+
+  g_list_free_full (monitor_configs, (GDestroyNotify) gf_monitor_config_free);
+  g_free (config);
+}
+
+gboolean
+gf_verify_logical_monitor_config (GfLogicalMonitorConfig      *config,
+                                  GfLogicalMonitorLayoutMode   layout_mode,
+                                  GfMonitorManager            *monitor_manager,
+                                  GError                     **error)
+{
+  GList *l;
+  gint expected_mode_width = 0;
+  gint expected_mode_height = 0;
+
+  if (config->layout.x < 0 || config->layout.y < 0)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                   "Invalid logical monitor position (%d, %d)",
+                   config->layout.x, config->layout.y);
+
+      return FALSE;
+    }
+
+  if (!config->monitor_configs)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                   "Logical monitor is empty");
+
+      return FALSE;
+    }
+
+  if (gf_monitor_transform_is_rotated (config->transform))
+    {
+      expected_mode_width = config->layout.height;
+      expected_mode_height = config->layout.width;
+    }
+  else
+    {
+      expected_mode_width = config->layout.width;
+      expected_mode_height = config->layout.height;
+    }
+
+  switch (layout_mode)
+    {
+      case GF_LOGICAL_MONITOR_LAYOUT_MODE_LOGICAL:
+        expected_mode_width = roundf (expected_mode_width * config->scale);
+        expected_mode_height = roundf (expected_mode_height * config->scale);
+        break;
+
+      case GF_LOGICAL_MONITOR_LAYOUT_MODE_PHYSICAL:
+      default:
+        break;
+    }
+
+  for (l = config->monitor_configs; l; l = l->next)
+    {
+      GfMonitorConfig *monitor_config = l->data;
+
+      if (monitor_config->mode_spec->width != expected_mode_width ||
+          monitor_config->mode_spec->height != expected_mode_height)
+        {
+          g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                       "Monitor modes in logical monitor conflict");
+
+          return FALSE;
+        }
+    }
+
+  return TRUE;
+}
diff --git a/backends/gf-logical-monitor-private.h b/backends/gf-logical-monitor-private.h
index 00b6f8d..0341cee 100644
--- a/backends/gf-logical-monitor-private.h
+++ b/backends/gf-logical-monitor-private.h
@@ -22,6 +22,7 @@
 #ifndef GF_LOGICAL_MONITOR_PRIVATE_H
 #define GF_LOGICAL_MONITOR_PRIVATE_H
 
+#include "gf-logical-monitor-config-private.h"
 #include "gf-monitor-config-manager-private.h"
 #include "gf-monitor-manager-private.h"
 #include "gf-monitor-private.h"
diff --git a/backends/gf-monitor-config-manager-private.h b/backends/gf-monitor-config-manager-private.h
index 7385e27..8d2d6bc 100644
--- a/backends/gf-monitor-config-manager-private.h
+++ b/backends/gf-monitor-config-manager-private.h
@@ -27,16 +27,6 @@
 
 G_BEGIN_DECLS
 
-typedef struct
-{
-  GfRectangle         layout;
-  GList              *monitor_configs;
-  GfMonitorTransform  transform;
-  gfloat              scale;
-  gboolean            is_primary;
-  gboolean            is_presentation;
-} GfLogicalMonitorConfig;
-
 G_END_DECLS
 
 #endif
diff --git a/backends/gf-monitor-manager-private.h b/backends/gf-monitor-manager-private.h
index 06dbf0b..d56db1d 100644
--- a/backends/gf-monitor-manager-private.h
+++ b/backends/gf-monitor-manager-private.h
@@ -168,6 +168,12 @@ void       gf_monitor_manager_tiled_monitor_added   (GfMonitorManager *manager,
 void       gf_monitor_manager_tiled_monitor_removed (GfMonitorManager *manager,
                                                      GfMonitor        *monitor);
 
+static inline gboolean
+gf_monitor_transform_is_rotated (GfMonitorTransform transform)
+{
+  return (transform % 2);
+}
+
 G_END_DECLS
 
 #endif