avfilter/drawutils: add gray9/10/12 support

libavfilter/drawutils.c

@@ -262,14 +262,16 @@ void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4
         EXPAND(2);
         EXPAND(1);
         EXPAND(0);
-    } else if (draw->format == AV_PIX_FMT_GRAY8 || draw->format == AV_PIX_FMT_GRAY8A) {
-        color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
-        color->comp[1].u8[0] = rgba[3];
-    } else if (draw->format == AV_PIX_FMT_GRAY16LE || draw->format == AV_PIX_FMT_YA16LE) {
+    } else if (draw->format == AV_PIX_FMT_GRAY8 || draw->format == AV_PIX_FMT_GRAY8A ||
+               draw->format == AV_PIX_FMT_GRAY16LE || draw->format == AV_PIX_FMT_YA16LE ||
+               draw->format == AV_PIX_FMT_GRAY9LE  ||
+               draw->format == AV_PIX_FMT_GRAY10LE ||
+               draw->format == AV_PIX_FMT_GRAY12LE) {
+        const AVPixFmtDescriptor *desc = draw->desc;
         color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
-        color->comp[0].u16[0] = color->comp[0].u8[0] << 8;
+        EXPAND(0);
         color->comp[1].u8[0] = rgba[3];
-        color->comp[1].u16[0] = color->comp[1].u8[0] << 8;
+        EXPAND(1);
     } else {
         av_log(NULL, AV_LOG_WARNING,
                "Color conversion not implemented for %s\n", draw->desc->name);