[gnome-music/wip/mschraal/artrework] albumartcache: Optimize frame rendering

[Marinus Schraal <mschraal src gnome org>]

commit d28bb78a4efce45b5e18dcf24653b84b1b9c4f7c
Author: Marinus Schraal <mschraal gnome org>
Date:   Mon Jan 29 12:43:47 2018 +0100

    albumartcache: Optimize frame rendering
    
    Use the ability to set_device_scale on a cairo.Surface to remove two
    steps in the frame drawing method.
    
    Closes: #81

 .gitlab-ci.yml              |  6 +++---
 configure.ac                |  3 +++
 gnomemusic/albumartcache.py | 21 ++++++++-------------
 3 files changed, 14 insertions(+), 16 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 353695c..50ed418 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,9 +6,9 @@ stages:
 
 variables:
   DEPENDENCIES: python3 autoconf-archive gettext-devel git pygobject3
-                pygobject3-devel python3-gobject redhat-rpm-config gtk3-devel
-                gobject-introspection-devel tracker-devel gnome-common which
-                libmediaart-devel grilo-devel
+                pygobject3-devel python3-gobject python3-cairo-devel
+                redhat-rpm-config gtk3-devel gobject-introspection-devel
+                tracker-devel gnome-common which libmediaart-devel grilo-devel
 
 build:
   stage: build
diff --git a/configure.ac b/configure.ac
index 3a69050..6c4beb7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,9 @@ PKG_CHECK_MODULES([MEDIAART], [libmediaart-2.0 >= 1.9.1])
 PYGOBJECT_MIN_VERSION=3.21.1
 PKG_CHECK_MODULES(PYGOBJECT, [pygobject-3.0 >= $PYGOBJECT_MIN_VERSION])
 
+PYCAIRO_MIN_VERSION=1.14.0
+PKG_CHECK_MODULES(PYCAIRO, [py3cairo >= $PYCAIRO_MIN_VERSION])
+
 TRACKER_MIN_VERSION=1.99.1
 PKG_CHECK_MODULES(TRACKER, [tracker-sparql-2.0 >= $TRACKER_MIN_VERSION])
 
diff --git a/gnomemusic/albumartcache.py b/gnomemusic/albumartcache.py
index ad3a4dc..b4571df 100644
--- a/gnomemusic/albumartcache.py
+++ b/gnomemusic/albumartcache.py
@@ -85,21 +85,22 @@ class Queue(GObject.GObject):
 
 @log
 def _make_icon_frame(pixbuf, art_size=None, scale=1):
-    border = 3 * scale
+    border = 3
     degrees = pi / 180
-    radius = 3 * scale
+    radius = 3
 
     ratio = pixbuf.get_height() / pixbuf.get_width()
 
     # Scale down the image according to the biggest axis
     if ratio > 1:
-        w = int(art_size.width / ratio * scale)
-        h = art_size.height * scale
+        w = int(art_size.width / ratio)
+        h = art_size.height
     else:
-        w = art_size.width * scale
-        h = int(art_size.height * ratio * scale)
+        w = art_size.width
+        h = int(art_size.height * ratio)
 
-    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h)
+    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w * scale, h * scale)
+    surface.set_device_scale(scale, scale)
     ctx = cairo.Context(surface)
 
     # draw outline
@@ -129,12 +130,6 @@ def _make_icon_frame(pixbuf, art_size=None, scale=1):
     ctx.rectangle(border, border, w - border * 2, h - border * 2)
     ctx.fill()
 
-    border_pixbuf = Gdk.pixbuf_get_from_surface(surface, 0, 0, w, h)
-
-    surface = Gdk.cairo_surface_create_from_pixbuf(border_pixbuf,
-                                                   scale,
-                                                   None)
-
     return surface