#3457 use avif after webp

xpra/server/window/window_source.py

@@ -1060,8 +1060,9 @@ def do_get_auto_encoding(self, w, h, options, current_encoding, encoding_options
         jpeg = "jpeg" in co and w>=2 and h>=2
         jpega = "jpega" in co and w>=2 and h>=2
         webp = "webp" in co and 16383>=w>=2 and 16383>=h>=2 and not grayscale
+        avif = "avif" in co
         lossy = quality<100
-        if depth in (24, 32) and (jpeg or jpega or webp):
+        if depth in (24, 32) and (jpeg or jpega or webp or avif):
             if webp and (not lossy or w*h<=WEBP_EFFICIENCY_CUTOFF):
                 return "webp"
             if lossy or not TRUE_LOSSLESS:
@@ -1071,6 +1072,8 @@ def do_get_auto_encoding(self, w, h, options, current_encoding, encoding_options
                     return "jpega"
             if webp:
                 return "webp"
+            if avif:
+                return "avif"
         elif depth>24 and "rgb32" in co and self.client_bit_depth>24 and self.client_bit_depth!=32:
             #the only encoding that can do higher bit depth at present
             #(typically r210 which is actually rgb30+2)
@@ -1079,7 +1082,6 @@ def do_get_auto_encoding(self, w, h, options, current_encoding, encoding_options
             return "png"
         if jpeg:
             return "jpeg"
-        avif = "avif" in co
         if avif:
             return "avif"
         if current_encoding in co: