path: root/.patches-to-be-ported-from-slick-greeter/0025-Add-option-to-span-background-across-multiple-monito.patch

From 293fa0d6a596ba9f1e9dd78a3da171fea3110b84 Mon Sep 17 00:00:00 2001
From: Geoff Paul <geoffro17@gmail.com>
Date: Sat, 7 Mar 2020 14:07:01 -0600
Subject: [PATCH 25/81] Add option to span background across multiple monitors

Signed-off-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
---
 data/x.dm.slick-greeter.gschema.xml |  8 +++
 src/background.vala                 | 87 ++++++++++++++++++++++-------
 src/greeter-list.vala               |  1 -
 src/main-window.vala                | 22 +-------
 src/settings.vala                   |  2 +
 5 files changed, 81 insertions(+), 39 deletions(-)

diff --git a/data/x.dm.slick-greeter.gschema.xml b/data/x.dm.slick-greeter.gschema.xml
index 90ebec8..7ceba14 100644
--- a/data/x.dm.slick-greeter.gschema.xml
+++ b/data/x.dm.slick-greeter.gschema.xml
@@ -9,6 +9,14 @@
       <default>'#000000'</default>
       <summary>Background color (e.g. #772953), set before wallpaper is seen</summary>
     </key>
+    <key name="background-mode" type="s">
+      <choices>
+        <choice value='zoom'/>
+        <choice value='spanned'/>
+      </choices>
+      <default>'zoom'</default>
+      <summary>Determines how the background image is rendered</summary>
+    </key>
     <key name="draw-user-backgrounds" type="b">
       <default>true</default>
       <summary>Whether to draw user backgrounds</summary>
diff --git a/src/background.vala b/src/background.vala
index f0789bf..e258d84 100644
--- a/src/background.vala
+++ b/src/background.vala
@@ -29,7 +29,6 @@ class BackgroundLoader : Object
     public Gdk.RGBA average_color;
 
     private Cairo.Surface target_surface;
-    private bool draw_grid;
     private Thread<void*> thread;
     private Gdk.Pixbuf[] images;
     private bool finished;
@@ -37,7 +36,7 @@ class BackgroundLoader : Object
 
     public signal void loaded ();
 
-    public BackgroundLoader (Cairo.Surface target_surface, string filename, int[] widths, int[] heights, bool draw_grid)
+    public BackgroundLoader (Cairo.Surface target_surface, string filename, int[] widths, int[] heights)
     {
         this.target_surface = target_surface;
         this.filename = filename;
@@ -45,7 +44,6 @@ class BackgroundLoader : Object
         this.heights = heights;
         patterns = new Cairo.Pattern[widths.length];
         images = new Gdk.Pixbuf[widths.length];
-        this.draw_grid = draw_grid;
     }
 
     public bool load ()
@@ -388,11 +386,14 @@ public class Monitor
 
 public class Background : Gtk.Fixed
 {
+    [Flags]
     public enum DrawFlags
     {
         NONE,
         GRID,
+        SPAN,
     }
+    private DrawFlags flags = DrawFlags.NONE;
 
     /* Fallback color - shown upon first startup, until an async background loader finishes,
      * or until a user background or default background is loaded.
@@ -464,7 +465,28 @@ public class Background : Gtk.Fixed
         }
     }
 
-    public bool draw_grid { get; set; default = true; }
+    /* Width - total pixel width of the entire background canvas. This total width
+     * should account for the relative geometry of all attached monitors.
+     */
+
+    private int _width = 0;
+    public int width {
+        get {
+            return _width;
+        }
+    }
+
+    /* Height - total pixel height of the entire background canvas. This total height
+     * should account for the relative geometry of all attached monitors.
+     */
+
+    private int _height = 0;
+    public int height {
+        get {
+            return _height;
+        }
+    }
+
     public double alpha { get; private set; default = 1.0; }
     public Gdk.RGBA average_color { get { return current.average_color; } }
 
@@ -493,8 +515,13 @@ public class Background : Gtk.Fixed
         timer = null;
 
         resize_mode = Gtk.ResizeMode.QUEUE;
-        draw_grid = UGSettings.get_boolean (UGSettings.KEY_DRAW_GRID);
         loaders = new HashTable<string?, BackgroundLoader> (str_hash, str_equal);
+        if (UGSettings.get_boolean (UGSettings.KEY_DRAW_GRID))
+            flags |= DrawFlags.GRID;
+
+        var mode = UGSettings.get_string (UGSettings.KEY_BACKGROUND_MODE);
+        if (mode == "spanned")
+            flags |= DrawFlags.SPAN;
 
         show ();
     }
@@ -545,7 +572,15 @@ public class Background : Gtk.Fixed
     {
         this.monitors = new List<Monitor> ();
         foreach (var m in monitors)
+        {
+            if (_width < m.x + m.width)
+                _width = m.x + m.width;
+
+            if (_height < m.y + m.height)
+                _height = m.y + m.height;
+
             this.monitors.append (m);
+        }
         queue_draw ();
     }
 
@@ -577,9 +612,6 @@ public class Background : Gtk.Fixed
 
     public override bool draw (Cairo.Context c)
     {
-        var flags = DrawFlags.NONE;
-        if (draw_grid)
-            flags |= DrawFlags.GRID;
         draw_full (c, flags);
         return base.draw (c);
     }
@@ -625,7 +657,7 @@ public class Background : Gtk.Fixed
 
         c.restore ();
 
-        if ((flags & DrawFlags.GRID) != 0)
+        if (DrawFlags.GRID in flags)
             overlay_grid (c);
     }
 
@@ -633,14 +665,22 @@ public class Background : Gtk.Fixed
     {
         foreach (var monitor in monitors)
         {
-            var pattern = background.get_pattern (monitor.width, monitor.height);
+            Cairo.Pattern? pattern;
+            var matrix = Cairo.Matrix.identity ();
+            if (DrawFlags.SPAN in flags)
+            {
+                pattern = background.get_pattern (_width, _height);
+            }
+            else
+            {
+                pattern = background.get_pattern (monitor.width, monitor.height);
+                matrix.translate (-monitor.x, -monitor.y);
+            }
+
             if (pattern == null)
                 continue;
 
             c.save ();
-            pattern = background.get_pattern (monitor.width, monitor.height);
-            var matrix = Cairo.Matrix.identity ();
-            matrix.translate (-monitor.x, -monitor.y);
             pattern.set_matrix (matrix);
             c.set_source (pattern);
             c.rectangle (monitor.x, monitor.y, monitor.width, monitor.height);
@@ -728,19 +768,28 @@ public class Background : Gtk.Fixed
             var widths = new int[monitors.length ()];
             var heights = new int[monitors.length ()];
             var n_sizes = 0;
-            foreach (var monitor in monitors)
+            if (DrawFlags.SPAN in flags)
+            {
+                widths[n_sizes] = _width;
+                heights[n_sizes] = _height;
+                n_sizes++;
+            }
+            else
             {
-                if (monitor_is_unique_size (monitor))
+                foreach (var monitor in monitors)
                 {
-                    widths[n_sizes] = monitor.width;
-                    heights[n_sizes] = monitor.height;
-                    n_sizes++;
+                    if (monitor_is_unique_size (monitor))
+                    {
+                        widths[n_sizes] = monitor.width;
+                        heights[n_sizes] = monitor.height;
+                        n_sizes++;
+                    }
                 }
             }
             widths.resize (n_sizes);
             heights.resize (n_sizes);
 
-            b = new BackgroundLoader (target_surface, filename, widths, heights, draw_grid);
+            b = new BackgroundLoader (target_surface, filename, widths, heights);
             b.logo = version_logo_surface;
             b.loaded.connect (() => { reload (); });
             b.load ();
diff --git a/src/greeter-list.vala b/src/greeter-list.vala
index 6d8f1f6..958720e 100644
--- a/src/greeter-list.vala
+++ b/src/greeter-list.vala
@@ -928,7 +928,6 @@ public abstract class GreeterList : FadableBox
         }
 
         /* Set the background */
-        background.draw_grid = false;
         background.queue_draw ();
     }
 
diff --git a/src/main-window.vala b/src/main-window.vala
index ddd3c00..3c4fb2b 100644
--- a/src/main-window.vala
+++ b/src/main-window.vala
@@ -32,8 +32,6 @@ public class MainWindow : Gtk.Window
     private Gtk.Box hbox;
     private Gtk.Button back_button;
     private ShutdownDialog? shutdown_dialog = null;
-    private int window_size_x;
-    private int window_size_y;
     private bool do_resize;
 
     public ListStack stack;
@@ -131,8 +129,6 @@ public class MainWindow : Gtk.Window
 
         add_user_list ();
 
-        window_size_x = 0;
-        window_size_y = 0;
         primary_monitor = null;
         do_resize = false;
 
@@ -147,7 +143,7 @@ public class MainWindow : Gtk.Window
             monitors.append (new Monitor (800, 120, 640, 480));
             background.set_monitors (monitors);
             move_to_monitor (monitors.nth_data (0));
-            resize (800 + 640, 600);
+            resize (background.width, background.height);
         }
         else
         {
@@ -212,7 +208,7 @@ public class MainWindow : Gtk.Window
     /* Setup the size and position of the window */
     public void setup_window ()
     {
-        resize (window_size_x, window_size_y);
+        resize (background.width, background.height);
         move (0, 0);
         move_to_monitor (primary_monitor);
     }
@@ -223,8 +219,6 @@ public class MainWindow : Gtk.Window
         Gdk.Monitor primary = display.get_primary_monitor();
         Gdk.Rectangle geometry;
 
-        window_size_x = 0;
-        window_size_y = 0;
         monitors = new List<Monitor> ();
         primary_monitor = null;
 
@@ -234,16 +228,6 @@ public class MainWindow : Gtk.Window
             geometry = monitor.get_geometry ();
             debug ("Monitor %d is %dx%d pixels at %d,%d", i, geometry.width, geometry.height, geometry.x, geometry.y);
 
-            if (window_size_x < geometry.x + geometry.width)
-            {
-                window_size_x = geometry.x + geometry.width;
-            }
-
-            if (window_size_y < geometry.y + geometry.height)
-            {
-                window_size_y = geometry.y + geometry.height;
-            }
-
             if (monitor_is_unique_position (display, i))
             {
                 var greeter_monitor = new Monitor (geometry.x, geometry.y, geometry.width, geometry.height);
@@ -258,7 +242,7 @@ public class MainWindow : Gtk.Window
             }
         }
 
-        debug ("MainWindow is %dx%d pixels", window_size_x, window_size_y);
+        debug ("MainWindow is %dx%d pixels", background.width, background.height);
 
         background.set_monitors (monitors);
 
diff --git a/src/settings.vala b/src/settings.vala
index 7d43449..3822939 100644
--- a/src/settings.vala
+++ b/src/settings.vala
@@ -22,6 +22,7 @@ public class UGSettings
 {
     public const string KEY_BACKGROUND = "background";
     public const string KEY_BACKGROUND_COLOR = "background-color";
+    public const string KEY_BACKGROUND_MODE = "background-mode";
     public const string KEY_DRAW_USER_BACKGROUNDS = "draw-user-backgrounds";
     public const string KEY_DRAW_GRID = "draw-grid";
     public const string KEY_SHOW_HOSTNAME = "show-hostname";
@@ -119,6 +120,7 @@ public class UGSettings
             var string_keys = new List<string> ();
             string_keys.append (KEY_BACKGROUND);
             string_keys.append (KEY_BACKGROUND_COLOR);
+            string_keys.append (KEY_BACKGROUND_MODE);
             string_keys.append (KEY_LOGO);
             string_keys.append (KEY_OTHER_MONITORS_LOGO);
             string_keys.append (KEY_THEME_NAME);
-- 
2.30.2