rgb2rgb: rgb12tobgr12()

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

libswscale/rgb2rgb.c

@@ -282,6 +282,19 @@ void rgb15tobgr15(const uint8_t *src, uint8_t *dst, int src_size)
     }
 }
 
+void rgb12tobgr12(const uint8_t *src, uint8_t *dst, int src_size)
+{
+    uint16_t *d = (uint16_t*)dst;
+    uint16_t *s = (uint16_t*)src;
+    int i;
+    int num_pixels = src_size >> 1;
+
+    for (i = 0; i < num_pixels; i++) {
+        unsigned rgb = s[i];
+        d[i] = (rgb << 8 | rgb & 0xF0 | rgb >> 8) & 0xFFF;
+    }
+}
+
 void bgr8torgb8(const uint8_t *src, uint8_t *dst, int src_size)
 {
     int i;

libswscale/rgb2rgb.h

@@ -62,6 +62,7 @@ void rgb15tobgr32(const uint8_t *src, uint8_t *dst, int src_size);
 void    rgb15to24(const uint8_t *src, uint8_t *dst, int src_size);
 void rgb15tobgr16(const uint8_t *src, uint8_t *dst, int src_size);
 void rgb15tobgr15(const uint8_t *src, uint8_t *dst, int src_size);
+void rgb12tobgr12(const uint8_t *src, uint8_t *dst, int src_size);
 void   bgr8torgb8(const uint8_t *src, uint8_t *dst, int src_size);
 
 void shuffle_bytes_0321(const uint8_t *src, uint8_t *dst, int src_size);

libswscale/swscale_unscaled.c

@@ -400,6 +400,7 @@ static int rgbToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
     } else if ((isBGRinInt(srcFormat) && isRGBinInt(dstFormat)) ||
                (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {
         switch (srcId | (dstId << 16)) {
+        case 0x000C000C: conv = rgb12tobgr12; break;
         case 0x000F000F: conv = rgb15tobgr15; break;
         case 0x000F0010: conv = rgb16tobgr15; break;
         case 0x000F0018: conv = rgb24tobgr15; break;