[retro-gtk] retro-cairo-display: Custom aspect ratio for pixbuf

[Adrien Plazas <aplazas src gnome org>]

commit 0aa107b524032934056deec086f8119a8d1fbc46
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Wed Aug 14 13:58:00 2019 +0500

    retro-cairo-display: Custom aspect ratio for pixbuf
    
    Read 'aspect-ratio' options for the GdkPixbuf passed in
    retro_gl_display_set_pixbuf() and use it instead of the core-provided
    aspect ratio if it's present.

 retro-gtk/retro-cairo-display.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/retro-gtk/retro-cairo-display.c b/retro-gtk/retro-cairo-display.c
index 379f52a..1fb637b 100644
--- a/retro-gtk/retro-cairo-display.c
+++ b/retro-gtk/retro-cairo-display.c
@@ -2,6 +2,7 @@
 
 #include "retro-cairo-display.h"
 
+#include "retro-pixbuf.h"
 #include "retro-pixdata.h"
 
 struct _RetroCairoDisplay
@@ -312,11 +313,16 @@ retro_cairo_display_get_pixbuf (RetroCairoDisplay *self)
  * @pixbuf: a #GdkPixbuf
  *
  * Sets @pixbuf as the currently displayed video frame.
+ *
+ * retro_pixbuf_set_aspect_ratio() can be used to specify the aspect ratio for
+ * the pixbuf. Otherwise the core's aspect ratio will be used.
  */
 void
 retro_cairo_display_set_pixbuf (RetroCairoDisplay *self,
                                 GdkPixbuf         *pixbuf)
 {
+  gfloat aspect_ratio;
+
   g_return_if_fail (self != NULL);
 
   if (self->pixbuf == pixbuf)
@@ -327,6 +333,10 @@ retro_cairo_display_set_pixbuf (RetroCairoDisplay *self,
   if (pixbuf != NULL)
     self->pixbuf = g_object_ref (pixbuf);
 
+  aspect_ratio = retro_pixbuf_get_aspect_ratio (pixbuf);
+  if (aspect_ratio != 0.f)
+    self->aspect_ratio = aspect_ratio;
+
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_PIXBUF]);
 }