diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/xine/xineutils.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/include/xine/xineutils.h b/include/xine/xineutils.h index 5b8b4f1f4..608384ad7 100644 --- a/include/xine/xineutils.h +++ b/include/xine/xineutils.h @@ -254,20 +254,21 @@ extern void (*yuy2_to_yv12) unsigned char *v_dst, int v_dst_pitch, int width, int height) XINE_PROTECTED; -/* convert full range rgb to mpeg range yuv */ -#define SCALESHIFT 16 -#define SCALEFACTOR (1<<SCALESHIFT) +#define SCALEFACTOR 65536 #define CENTERSAMPLE 128 +/* These conversions are normalised for the MPEG Y'CbCr colourspace. + * (Yes, we know that we call it YUV elsewhere.) + */ #define COMPUTE_Y(r, g, b) \ (unsigned char) \ - (((y_r_table[r] + y_g_table[g] + y_b_table[b]) >> SCALESHIFT) + 16) + ((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR) #define COMPUTE_U(r, g, b) \ (unsigned char) \ - (((u_r_table[r] + u_g_table[g] + u_b_table[b]) >> SCALESHIFT) + CENTERSAMPLE) + ((u_r_table[r] + u_g_table[g] + u_b_table[b]) / SCALEFACTOR + CENTERSAMPLE) #define COMPUTE_V(r, g, b) \ (unsigned char) \ - (((v_r_table[r] + v_g_table[g] + v_b_table[b]) >> SCALESHIFT) + CENTERSAMPLE) + ((v_r_table[r] + v_g_table[g] + v_b_table[b]) / SCALEFACTOR + CENTERSAMPLE) #define UNPACK_BGR15(packed_pixel, r, g, b) \ b = (packed_pixel & 0x7C00) >> 7; \ |