vdpau/display: test B8G8R8A8 SPU format

This also fixes a corner-case bug where whe format exposed on big
endian was not the one being tested.

modules/hw/vdpau/display.c

@@ -63,7 +63,7 @@ typedef struct vout_display_sys_t
     unsigned width;
     unsigned height;
 
-    vlc_fourcc_t spu_formats[2];
+    vlc_fourcc_t spu_formats[3];
 } vout_display_sys_t;
 
 static void RenderRegion(vout_display_t *vd, VdpOutputSurface target,
@@ -448,14 +448,25 @@ static int Open(vout_display_t *vd,
         VdpBool ok;
         unsigned int n = 0;
 
+#ifdef WORDS_BIGENDIAN
         err = vdp_bitmap_surface_query_capabilities(sys->vdp, sys->device,
                                                     VDP_RGBA_FORMAT_R8G8B8A8,
                                                     &ok, &w, &h);
         if (err == VDP_STATUS_OK && ok == VDP_TRUE)
+            sys->spu_formats[n++] = VLC_CODEC_RGBA;
+        if (n > 0) {
+            sys->spu_formats[n] = 0;
+            vd->info.subpicture_chromas = sys->spu_formats;
+        }
+#endif
+        err = vdp_bitmap_surface_query_capabilities(sys->vdp, sys->device,
+                                                    VDP_RGBA_FORMAT_B8G8R8A8,
+                                                    &ok, &w, &h);
+        if (err == VDP_STATUS_OK && ok == VDP_TRUE)
 #ifdef WORDS_BIGENDIAN
             sys->spu_formats[n++] = VLC_CODEC_ARGB;
 #else
-            sys->spu_formats[n++] = VLC_CODEC_RGBA;
+            sys->spu_formats[n++] = VLC_CODEC_BGRA;
 #endif
         if (n > 0) {
             sys->spu_formats[n] = 0;