add vc_copylineVUYAtoY416

This allows indirect conversion of 8-bit YUV 4:4:4 at least to Y416 for
displays that do not support VUYA directly over VUYA. Previously, due
to limited set of conversions from yuv444p and to Y416 it was UYVY, which
decimated the subsampling to 4:2:2.

Author: MartinPulec

src/pixfmt_conv.c

@@ -2653,6 +2653,27 @@ static void vc_copylineUYVYtoY416(unsigned char * __restrict dst, const unsigned
         }
 }
 
+static void
+vc_copylineVUYAtoY416(unsigned char *__restrict dst,
+                      const unsigned char *__restrict src, int dst_len,
+                      int rshift, int gshift, int bshift)
+{
+        (void) rshift, (void) gshift, (void) bshift;
+        const int dst_bs = get_pf_block_bytes(Y416); // 8
+        while (dst_len > dst_bs - 1) {
+                *dst++ = 0;
+                *dst++ = src[1]; // U
+                *dst++ = 0;
+                *dst++ = src[2]; // Y
+                *dst++ = 0;
+                *dst++ = src[0]; // V
+                *dst++ = 0;
+                *dst++ = src[3]; // A
+                src += 4;
+                dst_len -= dst_bs;
+        }
+}
+
 static void vc_copylineY216toUYVY(unsigned char * __restrict dst, const unsigned char * __restrict src, int dst_len, int rshift,
                 int gshift, int bshift)
 {
@@ -3012,6 +3033,7 @@ static const struct decoder_item decoders[] = {
         { vc_copylineUYVYtoV210,  UYVY,  v210 },
         { vc_copylineUYVYtoY216,  UYVY,  Y216 },
         { vc_copylineUYVYtoY416,  UYVY,  Y416 },
+        { vc_copylineVUYAtoY416,  VUYA,  Y416 },
         { vc_copylineY216toUYVY,  Y216,  UYVY },
         { vc_copylineY216toV210,  Y216,  v210 },
         { vc_copylineY416toUYVY,  Y416,  UYVY },