sws: remove cliping in yuv2rgb code.

This code should not be needed and it slows things down.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/output.c

@@ -1022,11 +1022,6 @@ yuv2rgb_2_c_template(SwsContext *c, const int16_t *buf[2],
                    *g = (c->table_gU[U + YUVRGB_TABLE_HEADROOM] + c->table_gV[V + YUVRGB_TABLE_HEADROOM]),
                    *b =  c->table_bU[U + YUVRGB_TABLE_HEADROOM];
 
-        Y1 = av_clip_uint8(Y1);
-        Y2 = av_clip_uint8(Y2);
-        U  = av_clip_uint8(U);
-        V  = av_clip_uint8(V);
-
         if (hasAlpha) {
             A1 = (abuf0[i * 2    ] * yalpha1 + abuf1[i * 2    ] * yalpha) >> 19;
             A2 = (abuf0[i * 2 + 1] * yalpha1 + abuf1[i * 2 + 1] * yalpha) >> 19;
@@ -1060,11 +1055,6 @@ yuv2rgb_1_c_template(SwsContext *c, const int16_t *buf0,
                        *g = (c->table_gU[U + YUVRGB_TABLE_HEADROOM] + c->table_gV[V + YUVRGB_TABLE_HEADROOM]),
                        *b =  c->table_bU[U + YUVRGB_TABLE_HEADROOM];
 
-            Y1 = av_clip_uint8(Y1);
-            Y2 = av_clip_uint8(Y2);
-            U  = av_clip_uint8(U);
-            V  = av_clip_uint8(V);
-
             if (hasAlpha) {
                 A1 = abuf0[i * 2    ] * 255 + 16384 >> 15;
                 A2 = abuf0[i * 2 + 1] * 255 + 16384 >> 15;
@@ -1087,11 +1077,6 @@ yuv2rgb_1_c_template(SwsContext *c, const int16_t *buf0,
                        *g = (c->table_gU[U + YUVRGB_TABLE_HEADROOM] + c->table_gV[V + YUVRGB_TABLE_HEADROOM]),
                        *b =  c->table_bU[U + YUVRGB_TABLE_HEADROOM];
 
-            Y1 = av_clip_uint8(Y1);
-            Y2 = av_clip_uint8(Y2);
-            U  = av_clip_uint8(U);
-            V  = av_clip_uint8(V);
-
             if (hasAlpha) {
                 A1 = (abuf0[i * 2    ] + 64) >> 7;
                 A2 = (abuf0[i * 2 + 1] + 64) >> 7;