lavfi/drawutils: fix planar rgb

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/drawutils.c

@@ -197,10 +197,15 @@ void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4
 
     if (rgba != color->rgba)
         memcpy(color->rgba, rgba, sizeof(color->rgba));
-    if ((draw->desc->flags & AV_PIX_FMT_FLAG_RGB) && draw->nb_planes == 1 &&
+    if ((draw->desc->flags & AV_PIX_FMT_FLAG_RGB) &&
         ff_fill_rgba_map(rgba_map, draw->format) >= 0) {
+        if (draw->nb_planes == 1) {
         for (i = 0; i < 4; i++)
             color->comp[0].u8[rgba_map[i]] = rgba[i];
+        } else {
+            for (i = 0; i < 4; i++)
+                color->comp[rgba_map[i]].u8[0] = rgba[i];
+        }
     } else if (draw->nb_planes == 3 || draw->nb_planes == 4) {
         /* assume YUV */
         color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

tests/ref/fate/filter-pixfmts-pad

@@ -5,8 +5,8 @@ argb                e5fbb7bb282a80897b8f730627f68876
 bgr0                c55368036cccbb0af471d6bd82abe02a
 bgr24               67f9fd70dc6d9896b7122976b33932b4
 bgra                c8dd017b5a3b55e8b9d0ac1cdcf327bd
-gbrap               23e8ef832c4aef52c6183f429ac86b32
-gbrp                74f83deee9866bbdce3f91fa2aeddaaa
+gbrap               8551b62534034c8aaebaa7d9fdefdfe9
+gbrp                4f3b389ed3f8a3945560a36f862b452a
 gray                ca280f6888a9b66688b5f8ea68fe454a
 rgb0                b1977b45634c4db58a183a07feb2acff
 rgb24               e73de9dc0fdd78f4853c168603cc7aba