Modules/yuvconvert.c

   1 /***********************************************************
   2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
   3 The Netherlands.
   4
   5                         All Rights Reserved
   6
   7 Permission to use, copy, modify, and distribute this software and its
   8 documentation for any purpose and without fee is hereby granted,
   9 provided that the above copyright notice appear in all copies and that
  10 both that copyright notice and this permission notice appear in
  11 supporting documentation, and that the names of Stichting Mathematisch
  12 Centrum or CWI or Corporation for National Research Initiatives or
  13 CNRI not be used in advertising or publicity pertaining to
  14 distribution of the software without specific, written prior
  15 permission.
  16
  17 While CWI is the initial source for this software, a modified version
  18 is made available by the Corporation for National Research Initiatives
  19 (CNRI) at the Internet address ftp://ftp.python.org.
  20
  21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
  22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
  24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  28 PERFORMANCE OF THIS SOFTWARE.
  29
  30 ******************************************************************/
  31
  32 #include "yuv.h"
  33
  34 void
  35 yuv_sv411_to_cl422dc(int invert, void *data, void *yuv, int width, int height)
  36 {
  37         struct yuv411 *in = data;
  38         struct yuv422 *out_even = yuv;
  39         struct yuv422 *out_odd = out_even + width / 2;
  40         int i, j;               /* counters */
  41
  42         for (i = height / 2; i--; ) {
  43                 for (j = width / 4; j--; ) {
  44                         YUV422_Y0(*out_even) = YUV411_Y00(*in);
  45                         YUV422_U0(*out_even) = YUV411_U00(*in);
  46                         YUV422_V0(*out_even) = YUV411_V00(*in);
  47                         YUV422_Y1(*out_even) = YUV411_Y01(*in);
  48                         out_even++;
  49                         YUV422_Y0(*out_even) = YUV411_Y02(*in);
  50                         YUV422_U0(*out_even) = YUV411_U02(*in);
  51                         YUV422_V0(*out_even) = YUV411_V02(*in);
  52                         YUV422_Y1(*out_even) = YUV411_Y03(*in);
  53                         out_even++;
  54                         YUV422_Y0(*out_odd) = YUV411_Y10(*in);
  55                         YUV422_U0(*out_odd) = YUV411_U10(*in);
  56                         YUV422_V0(*out_odd) = YUV411_V10(*in);
  57                         YUV422_Y1(*out_odd) = YUV411_Y11(*in);
  58                         out_odd++;
  59                         YUV422_Y0(*out_odd) = YUV411_Y12(*in);
  60                         YUV422_U0(*out_odd) = YUV411_U12(*in);
  61                         YUV422_V0(*out_odd) = YUV411_V12(*in);
  62                         YUV422_Y1(*out_odd) = YUV411_Y13(*in);
  63                         out_odd++;
  64                         in++;
  65                 }
  66                 out_even += width / 2;
  67                 out_odd += width / 2;
  68         }
  69 }
  70
  71 void
  72 yuv_sv411_to_cl422dc_quartersize(int invert, void *data, void *yuv,
  73                                  int width, int height)
  74 {
  75         int w4 = width / 4;     /* quarter of width is used often */
  76         struct yuv411 *in_even = data;
  77         struct yuv411 *in_odd = in_even + w4;
  78         struct yuv422 *out_even = yuv;
  79         struct yuv422 *out_odd = out_even + w4;
  80         int i, j;               /* counters */
  81         int u, v;               /* U and V values */
  82
  83         for (i = height / 4; i--; ) {
  84                 for (j = w4; j--; ) {
  85                         u = YUV411_U00(*in_even);
  86                         v = YUV411_V00(*in_even);
  87
  88                         YUV422_Y0(*out_even) = YUV411_Y00(*in_even);
  89                         YUV422_U0(*out_even) = u;
  90                         YUV422_V0(*out_even) = v;
  91                         YUV422_Y1(*out_even) = YUV411_Y02(*in_even);
  92
  93                         YUV422_Y0(*out_odd) = YUV411_Y10(*in_odd);
  94                         YUV422_U0(*out_odd) = u;
  95                         YUV422_V0(*out_odd) = v;
  96                         YUV422_Y1(*out_odd) = YUV411_Y12(*in_odd);
  97
  98                         in_even++;
  99                         in_odd++;
 100                         out_even++;
 101                         out_odd++;
 102                 }
 103                 in_even += w4;
 104                 in_odd += w4;
 105                 out_even += w4;
 106                 out_odd += w4;
 107         }
 108 }
 109
 110 void
 111 yuv_sv411_to_cl422dc_sixteenthsize(int invert, void *data, void *yuv,
 112                                    int width, int height)
 113 {
 114         int w4_3 = 3 * width / 4; /* three quarters of width is used often */
 115         int w8 = width / 8;     /* and so is one eighth */
 116         struct yuv411 *in_even = data;
 117         struct yuv411 *in_odd = in_even + width / 2;
 118         struct yuv422 *out_even = yuv;
 119         struct yuv422 *out_odd = out_even + w8;
 120         int i, j;               /* counters */
 121         int u, v;               /* U and V values */
 122
 123         for (i = height / 8; i--; ) {
 124                 for (j = w8; j--; ) {
 125                         u = YUV411_U00(in_even[0]);
 126                         v = YUV411_V00(in_even[0]);
 127
 128                         YUV422_Y0(*out_even) = YUV411_Y00(in_even[0]);
 129                         YUV422_U0(*out_even) = u;
 130                         YUV422_V0(*out_even) = v;
 131                         YUV422_Y1(*out_even) = YUV411_Y00(in_even[1]);
 132
 133                         YUV422_Y0(*out_odd) = YUV411_Y00(in_odd[0]);
 134                         YUV422_U0(*out_odd) = u;
 135                         YUV422_V0(*out_odd) = v;
 136                         YUV422_Y1(*out_odd) = YUV411_Y00(in_even[1]);
 137
 138                         in_even += 2;
 139                         in_odd += 2;
 140                         out_even++;
 141                         out_odd++;
 142                 }
 143                 in_even += w4_3;
 144                 in_odd += w4_3;
 145                 out_even += w8;
 146                 out_odd += w8;
 147         }
 148 }