gtk4: Only support RGBA/RGB in the GL code path

For all other component orderings a shader is necessary to re-order the
components for what GTK expects.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1312>

1 files changed, 15 insertions, 3 deletions

diff --git a/video/gtk4/src/sink/imp.rs b/video/gtk4/src/sink/imp.rs
index 185ac4b10..6b23b71d8 100644
--- a/video/gtk4/src/sink/imp.rs
+++ b/video/gtk4/src/sink/imp.rs
@@ -168,15 +168,27 @@ impl ElementImpl for PaintableSink {
                     ])),
                     Some(gst::CapsFeatures::new(["meta:GstVideoOverlayComposition"])),
                 ] {
-                    let mut c = gst_video::video_make_raw_caps(&[
+                    const GL_FORMATS: &[gst_video::VideoFormat] =
+                        &[gst_video::VideoFormat::Rgba, gst_video::VideoFormat::Rgb];
+                    const NON_GL_FORMATS: &[gst_video::VideoFormat] = &[
                         gst_video::VideoFormat::Bgra,
                         gst_video::VideoFormat::Argb,
                         gst_video::VideoFormat::Rgba,
                         gst_video::VideoFormat::Abgr,
                         gst_video::VideoFormat::Rgb,
                         gst_video::VideoFormat::Bgr,
-                    ])
-                    .build();
+                    ];
+
+                    let formats = if features
+                        .as_ref()
+                        .is_some_and(|features| features.contains("memory:GLMemory"))
+                    {
+                        GL_FORMATS
+                    } else {
+                        NON_GL_FORMATS
+                    };
+
+                    let mut c = gst_video::video_make_raw_caps(formats).build();
 
                     if let Some(features) = features {
                         let c = c.get_mut().unwrap();