swscale: simplify unscaled rgb48<->bgr48

Using av_bswap16 should be enough.

libswscale/colorspace-test.c

@@ -84,8 +84,8 @@ int main(int argc, char **argv)
             FUNC(4, 2, rgb32tobgr16),
             FUNC(4, 3, rgb32tobgr24),
             FUNC(4, 4, shuffle_bytes_2103), /* rgb32tobgr32 */
-            FUNC(6, 6, rgb48tobgr48_LL),
-            FUNC(6, 6, rgb48tobgr48_LB),
+            FUNC(6, 6, rgb48tobgr48_nobswap),
+            FUNC(6, 6, rgb48tobgr48_bswap),
             FUNC(0, 0, NULL)
         };
         int width;

libswscale/rgb2rgb.c

@@ -26,7 +26,6 @@
 #include <inttypes.h>
 
 #include "libavutil/bswap.h"
-#include "libavutil/intreadwrite.h"
 #include "config.h"
 #include "rgb2rgb.h"
 #include "swscale.h"
@@ -335,8 +334,8 @@ DEFINE_SHUFFLE_BYTES(1, 2, 3, 0)
 DEFINE_SHUFFLE_BYTES(3, 0, 1, 2)
 DEFINE_SHUFFLE_BYTES(3, 2, 1, 0)
 
-#define DEFINE_RGB48TOBGR48(ie, oe)                                     \
-void rgb48tobgr48_ ## ie ## oe(const uint8_t *src,                      \
+#define DEFINE_RGB48TOBGR48(need_bswap, swap)                           \
+void rgb48tobgr48_ ## need_bswap(const uint8_t *src,                    \
                                  uint8_t *dst, int src_size)            \
 {                                                                       \
     uint16_t *d = (uint16_t *)dst;                                      \
@@ -344,11 +343,11 @@ void rgb48tobgr48_ ## ie ## oe(const uint8_t *src,                      \
     int i, num_pixels = src_size >> 1;                                  \
                                                                         \
     for (i = 0; i < num_pixels; i += 3) {                               \
-        AV_W ## oe ## 16(&d[i    ], AV_R ## ie ## 16(&s[i + 2]));       \
-        AV_W ## oe ## 16(&d[i + 1], AV_R ## ie ## 16(&s[i + 1]));       \
-        AV_W ## oe ## 16(&d[i + 2], AV_R ## ie ## 16(&s[i    ]));       \
+        d[i    ] = swap ? av_bswap16(s[i + 2]) : s[i + 2];              \
+        d[i + 1] = swap ? av_bswap16(s[i + 1]) : s[i + 1];              \
+        d[i + 2] = swap ? av_bswap16(s[i    ]) : s[i    ];              \
     }                                                                   \
 }
 
-DEFINE_RGB48TOBGR48(L, L)
-DEFINE_RGB48TOBGR48(L, B)
+DEFINE_RGB48TOBGR48(nobswap, 0)
+DEFINE_RGB48TOBGR48(bswap, 1)

libswscale/rgb2rgb.h

@@ -52,8 +52,8 @@ extern void (*rgb32tobgr15)(const uint8_t *src, uint8_t *dst, int src_size);
 
 extern void (*shuffle_bytes_2103)(const uint8_t *src, uint8_t *dst, int src_size);
 
-void rgb48tobgr48_LL(const uint8_t *src, uint8_t *dst, int src_size);
-void rgb48tobgr48_LB(const uint8_t *src, uint8_t *dst, int src_size);
+void rgb48tobgr48_nobswap(const uint8_t *src, uint8_t *dst, int src_size);
+void   rgb48tobgr48_bswap(const uint8_t *src, uint8_t *dst, int src_size);
 void    rgb24to32(const uint8_t *src, uint8_t *dst, int src_size);
 void    rgb32to24(const uint8_t *src, uint8_t *dst, int src_size);
 void rgb16tobgr32(const uint8_t *src, uint8_t *dst, int src_size);

libswscale/swscale_unscaled.c

@@ -561,11 +561,11 @@ static rgbConvFn findRgbConvFn(SwsContext *c)
         if      (CONV_IS(RGB48LE, BGR48LE)
               || CONV_IS(BGR48LE, RGB48LE)
               || CONV_IS(RGB48BE, BGR48BE)
-              || CONV_IS(BGR48BE, RGB48BE)) conv = rgb48tobgr48_LL;
+              || CONV_IS(BGR48BE, RGB48BE)) conv = rgb48tobgr48_nobswap;
         else if (CONV_IS(RGB48LE, BGR48BE)
               || CONV_IS(BGR48LE, RGB48BE)
               || CONV_IS(RGB48BE, BGR48LE)
-              || CONV_IS(BGR48BE, RGB48LE)) conv = rgb48tobgr48_LB;
+              || CONV_IS(BGR48BE, RGB48LE)) conv = rgb48tobgr48_bswap;
     } else
     /* BGR -> BGR */
     if ((isBGRinInt(srcFormat) && isBGRinInt(dstFormat)) ||