[mutter] wayland/shm: Add ARGB2101010 formats and friends

[Robert Mader <rmader src gnome org>]

commit 115de303b0675efc2e8b0dcc96ae9444a7f114ae
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Sep 18 16:38:20 2019 +0200

    wayland/shm: Add ARGB2101010 formats and friends
    
    In order to get higher color pixel precision when the alpha channel is
    less important. Only advertise these formats if it is supported by the
    used cogl renderer.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/804

 src/wayland/meta-wayland-buffer.c | 42 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)
---
diff --git a/src/wayland/meta-wayland-buffer.c b/src/wayland/meta-wayland-buffer.c
index 60ef78cd12..312fc26f93 100644
--- a/src/wayland/meta-wayland-buffer.c
+++ b/src/wayland/meta-wayland-buffer.c
@@ -217,6 +217,18 @@ shm_format_to_cogl_pixel_format (enum wl_shm_format     shm_format,
       format = COGL_PIXEL_FORMAT_BGRA_8888;
       components = COGL_TEXTURE_COMPONENTS_RGB;
       break;
+    case WL_SHM_FORMAT_XRGB2101010:
+      components = COGL_TEXTURE_COMPONENTS_RGB;
+      G_GNUC_FALLTHROUGH;
+    case WL_SHM_FORMAT_ARGB2101010:
+      format = COGL_PIXEL_FORMAT_ARGB_2101010_PRE;
+      break;
+    case WL_SHM_FORMAT_XBGR2101010:
+      components = COGL_TEXTURE_COMPONENTS_RGB;
+      G_GNUC_FALLTHROUGH;
+    case WL_SHM_FORMAT_ABGR2101010:
+      format = COGL_PIXEL_FORMAT_ABGR_2101010_PRE;
+      break;
 #endif
     default:
       return FALSE;
@@ -235,6 +247,10 @@ shm_buffer_get_cogl_pixel_format (struct wl_shm_buffer  *shm_buffer,
                                   CoglPixelFormat       *format_out,
                                   CoglTextureComponents *components_out)
 {
+  MetaBackend *backend = meta_get_backend ();
+  ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
+  CoglContext *cogl_context =
+    clutter_backend_get_cogl_context (clutter_backend);
   CoglPixelFormat cogl_format;
   CoglTextureComponents cogl_components;
 
@@ -243,6 +259,9 @@ shm_buffer_get_cogl_pixel_format (struct wl_shm_buffer  *shm_buffer,
                                         &cogl_components))
     return FALSE;
 
+  if (!cogl_context_format_supports_upload (cogl_context, cogl_format))
+    return FALSE;
+
   if (format_out)
     *format_out = cogl_format;
   if (components_out)
@@ -745,9 +764,18 @@ meta_wayland_buffer_class_init (MetaWaylandBufferClass *klass)
 void
 meta_wayland_init_shm (MetaWaylandCompositor *compositor)
 {
+  MetaBackend *backend = meta_get_backend ();
+  ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
+  CoglContext *cogl_context =
+    clutter_backend_get_cogl_context (clutter_backend);
+
   static const enum wl_shm_format shm_formats[] = {
 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
     WL_SHM_FORMAT_RGB565,
+    WL_SHM_FORMAT_ARGB2101010,
+    WL_SHM_FORMAT_XRGB2101010,
+    WL_SHM_FORMAT_ABGR2101010,
+    WL_SHM_FORMAT_XBGR2101010,
 #endif
   };
   int i;
@@ -755,5 +783,17 @@ meta_wayland_init_shm (MetaWaylandCompositor *compositor)
   wl_display_init_shm (compositor->wayland_display);
 
   for (i = 0; i < G_N_ELEMENTS (shm_formats); i++)
-    wl_display_add_shm_format (compositor->wayland_display, shm_formats[i]);
+    {
+      CoglPixelFormat cogl_format;
+
+      if (!shm_format_to_cogl_pixel_format (shm_formats[i],
+                                            &cogl_format,
+                                            NULL))
+        continue;
+
+      if (!cogl_context_format_supports_upload (cogl_context, cogl_format))
+        continue;
+
+      wl_display_add_shm_format (compositor->wayland_display, shm_formats[i]);
+    }
 }