fate: add xBR filter tests

tests/fate/filter-video.mak

@@ -156,6 +156,13 @@ fate-filter-hq3x: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf
 fate-filter-hq4x: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf hqx=4 -pix_fmt bgra
 fate-filter-hqx: $(FATE_FILTER_HQX-yes)
 
+FATE_FILTER_XBR-$(call ALLYES, IMAGE2_DEMUXER PNG_DECODER XBR_FILTER) = fate-filter-2xbr fate-filter-3xbr fate-filter-4xbr
+FATE_FILTER-yes += $(FATE_FILTER_XBR-yes)
+fate-filter-2xbr: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf xbr=2 -pix_fmt bgra
+fate-filter-3xbr: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf xbr=3 -pix_fmt bgra
+fate-filter-4xbr: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf xbr=4 -pix_fmt bgra
+fate-filter-xbr: $(FATE_FILTER_XBR-yes)
+
 FATE_FILTER-$(call ALLYES, UTVIDEO_DECODER AVI_DEMUXER PERMS_FILTER CURVES_FILTER) += fate-filter-curves
 fate-filter-curves: CMD = framecrc -i $(TARGET_SAMPLES)/utvideo/utvideo_rgb_median.avi -vf perms=random,curves=vintage
 

tests/ref/fate/filter-2xbr

+#tb 0: 1/25
+0,          0,          0,        1,   877072, 0x5142c6cd
+0,          1,          1,        1,   877072, 0xa01a3f47

tests/ref/fate/filter-3xbr

+#tb 0: 1/25
+0,          0,          0,        1,  1973412, 0xd4cf257b
+0,          1,          1,        1,  1973412, 0x63fcd614

tests/ref/fate/filter-4xbr

+#tb 0: 1/25
+0,          0,          0,        1,  3508288, 0xc7b1d170
+0,          1,          1,        1,  3508288, 0x3fd0c3fb