[retro-gtk] cairo-display: Allow to set a video filter

[Adrien Plazas <aplazas src gnome org>]

commit 01b3f4f02d86565fd2a6dccb5eb65a1816a4701a
Author: theawless <theawless gmail com>
Date:   Fri Feb 10 22:57:39 2017 +0530

    cairo-display: Allow to set a video filter
    
    Add CairoDisplay.set_filter() and render the video with the given
    filter.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777987

 retro-gtk/video/cairo-display.vala |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/retro-gtk/video/cairo-display.vala b/retro-gtk/video/cairo-display.vala
index a8608cc..3018324 100644
--- a/retro-gtk/video/cairo-display.vala
+++ b/retro-gtk/video/cairo-display.vala
@@ -4,11 +4,13 @@ public class RetroGtk.CairoDisplay : Gtk.DrawingArea {
        public Gdk.Pixbuf pixbuf { set; get; }
 
        private Retro.Core core;
+       private VideoFilter filter;
        private ulong on_video_output_id;
        private float aspect_ratio;
        private bool show_surface;
 
        construct {
+               filter = VideoFilter.SMOOTH;
                show_surface = true;
 
                notify["sensitive"].connect (queue_draw);
@@ -26,6 +28,11 @@ public class RetroGtk.CairoDisplay : Gtk.DrawingArea {
                on_video_output_id = core.video_output.connect (on_video_output);
        }
 
+       public void set_filter (VideoFilter filter) {
+               this.filter = filter;
+               queue_draw ();
+       }
+
        private void on_video_output (uint8[] data, uint width, uint height, size_t pitch, Retro.PixelFormat 
pixel_format, float aspect_ratio) {
                this.aspect_ratio = aspect_ratio;
                pixbuf = gdk_pixbuf_new_from_video (data, width, height, pitch, pixel_format);
@@ -65,6 +72,18 @@ public class RetroGtk.CairoDisplay : Gtk.DrawingArea {
 
                cr.scale (xs, ys);
                cr.set_source_surface (surface, x/xs, y/ys);
+               var source = cr.get_source ();
+               switch (filter) {
+               case VideoFilter.SHARP:
+                       source.set_filter (Cairo.Filter.NEAREST);
+
+                       break;
+               case VideoFilter.SMOOTH:
+               default:
+                       source.set_filter (Cairo.Filter.BILINEAR);
+
+                       break;
+               }
                cr.paint ();
 
                return true;