[gnome-backgrounds] first iteration of default 40

[Jakub Steiner <jimmac src gnome org>]

commit 5bfab42fd6c6581f7947e16a40ad958fc33fcf55
Author: Jakub Steiner <jimmac gmail com>
Date:   Tue Dec 1 13:11:25 2020 +0100

    first iteration of default 40

 backgrounds/adwaita-day.jpg      | Bin 2459290 -> 0 bytes
 backgrounds/adwaita-day.png      | Bin 0 -> 3879012 bytes
 backgrounds/adwaita-morning.jpg  | Bin 2529518 -> 0 bytes
 backgrounds/adwaita-morning.png  | Bin 0 -> 3246584 bytes
 backgrounds/adwaita-night.jpg    | Bin 3760798 -> 0 bytes
 backgrounds/adwaita-night.png    | Bin 0 -> 3733998 bytes
 backgrounds/adwaita-timed.xml.in |  18 +++++++++---------
 backgrounds/meson.build          |   6 +++---
 8 files changed, 12 insertions(+), 12 deletions(-)
---
diff --git a/backgrounds/adwaita-day.png b/backgrounds/adwaita-day.png
new file mode 100644
index 0000000..2d509ec
Binary files /dev/null and b/backgrounds/adwaita-day.png differ
diff --git a/backgrounds/adwaita-morning.png b/backgrounds/adwaita-morning.png
new file mode 100644
index 0000000..7564869
Binary files /dev/null and b/backgrounds/adwaita-morning.png differ
diff --git a/backgrounds/adwaita-night.png b/backgrounds/adwaita-night.png
new file mode 100644
index 0000000..7d6f42b
Binary files /dev/null and b/backgrounds/adwaita-night.png differ
diff --git a/backgrounds/adwaita-timed.xml.in b/backgrounds/adwaita-timed.xml.in
index 9a024dc..dccf662 100644
--- a/backgrounds/adwaita-timed.xml.in
+++ b/backgrounds/adwaita-timed.xml.in
@@ -13,39 +13,39 @@
 <!-- We start with sunrise at 7 AM. It will remain up for 1 hour. -->
 <static>
 <duration>3600.0</duration>
-<file>@datadir@/backgrounds/gnome/adwaita-morning.jpg</file>
+<file>@datadir@/backgrounds/gnome/adwaita-morning.png</file>
 </static>
 
 <!-- Sunrise starts to transition to day at 8 AM. The transition lasts for 5 hours, ending at 1 PM. -->
 <transition type="overlay">
 <duration>18000.0</duration>
-<from>@datadir@/backgrounds/gnome/adwaita-morning.jpg</from>
-<to>@datadir@/backgrounds/gnome/adwaita-day.jpg</to>
+<from>@datadir@/backgrounds/gnome/adwaita-morning.png</from>
+<to>@datadir@/backgrounds/gnome/adwaita-day.png</to>
 </transition>
 
 <!-- It's 1 PM, we're showing the day image in full force now, for 5 hours ending at 6 PM. -->
 <static>
 <duration>18000.0</duration>
-<file>@datadir@/backgrounds/gnome/adwaita-day.jpg</file>
+<file>@datadir@/backgrounds/gnome/adwaita-day.png</file>
 </static>
 
 <!-- It's 7 PM and it's going to start to get darker. This will transition for 6 hours up until midnight. -->
 <transition type="overlay">
 <duration>21600.0</duration>
-<from>@datadir@/backgrounds/gnome/adwaita-day.jpg</from>
-<to>@datadir@/backgrounds/gnome/adwaita-night.jpg</to>
+<from>@datadir@/backgrounds/gnome/adwaita-day.png</from>
+<to>@datadir@/backgrounds/gnome/adwaita-night.png</to>
 </transition>
 
 <!-- It's midnight. It'll stay dark for 5 hours up until 5 AM. -->
 <static>
 <duration>18000.0</duration>
-<file>@datadir@/backgrounds/gnome/adwaita-night.jpg</file>
+<file>@datadir@/backgrounds/gnome/adwaita-night.png</file>
 </static>
 
 <!-- It's 5 AM. We'll start transitioning to sunrise for 2 hours up until 7 AM. -->
 <transition type="overlay">
 <duration>7200.0</duration>
-<from>@datadir@/backgrounds/gnome/adwaita-night.jpg</from>
-<to>@datadir@/backgrounds/gnome/adwaita-morning.jpg</to>
+<from>@datadir@/backgrounds/gnome/adwaita-night.png</from>
+<to>@datadir@/backgrounds/gnome/adwaita-morning.png</to>
 </transition>
 </background>
diff --git a/backgrounds/meson.build b/backgrounds/meson.build
index 82c626d..ff8c5ce 100644
--- a/backgrounds/meson.build
+++ b/backgrounds/meson.build
@@ -9,9 +9,9 @@ adwaita_timed = configure_file(
 )
 
 backgrounds = [
-  'adwaita-day.jpg',
-  'adwaita-morning.jpg',
-  'adwaita-night.jpg',
+  'adwaita-day.png',
+  'adwaita-morning.png',
+  'adwaita-night.png',
   'ColdWarm.jpg',
   'DepthLava.png',
   'IceCrystals.jpg',