com32/lib/jpeg/yuv420p.c

   1 /*
   2  * Small jpeg decoder library
   3  *
   4  * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
   5  * All rights reserved.
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright notice,
  10  *  this list of conditions and the following disclaimer.
  11  *
  12  * - Redistributions in binary form must reproduce the above copyright notice,
  13  *  this list of conditions and the following disclaimer in the documentation
  14  *  and/or other materials provided with the distribution.
  15  *
  16  * - Neither the name of the author nor the names of its contributors may be
  17  *  used to endorse or promote products derived from this software without
  18  *  specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  */
  33
  34 /*
  35  * yuv420p.c
  36  */
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <stdint.h>
  42
  43 #include "tinyjpeg.h"
  44 #include "tinyjpeg-internal.h"
  45
  46 /**
  47  *  YCrCb -> YUV420P (1x1)
  48  *  .---.
  49  *  | 1 |
  50  *  `---'
  51  */
  52 static void YCrCB_to_YUV420P_1x1(struct jdec_private *priv)
  53 {
  54   const unsigned char *s, *y;
  55   unsigned char *p;
  56   int i,j;
  57
  58   p = priv->plane[0];
  59   y = priv->Y;
  60   for (i=0; i<8; i++)
  61    {
  62      memcpy(p, y, 8);
  63      p += priv->bytes_per_row[0];
  64      y += 8;
  65    }
  66
  67   p = priv->plane[1];
  68   s = priv->Cb;
  69   for (i=0; i<8; i+=2)
  70    {
  71      for (j=0; j<8; j+=2, s+=2)
  72        *p++ = *s;
  73      s += 8; /* Skip one line */
  74      p += priv->bytes_per_row[1] - 4;
  75    }
  76
  77   p = priv->plane[2];
  78   s = priv->Cr;
  79   for (i=0; i<8; i+=2)
  80    {
  81      for (j=0; j<8; j+=2, s+=2)
  82        *p++ = *s;
  83      s += 8; /* Skip one line */
  84      p += priv->bytes_per_row[2] - 4;
  85    }
  86 }
  87
  88 /**
  89  *  YCrCb -> YUV420P (2x1)
  90  *  .-------.
  91  *  | 1 | 2 |
  92  *  `-------'
  93  */
  94 static void YCrCB_to_YUV420P_2x1(struct jdec_private *priv)
  95 {
  96   unsigned char *p;
  97   const unsigned char *s, *y1;
  98   int i,j;
  99
 100   p = priv->plane[0];
 101   y1 = priv->Y;
 102   for (i=0; i<8; i++)
 103    {
 104      memcpy(p, y1, 16);
 105      p += priv->bytes_per_row[0];
 106      y1 += 16;
 107    }
 108
 109   p = priv->plane[1];
 110   s = priv->Cb;
 111   for (i=0; i<8; i+=2)
 112    {
 113      for (j=0; j<8; j+=1, s+=1)
 114        *p++ = *s;
 115      s += 8; /* Skip one line */
 116      p += priv->bytes_per_row[1] - 8;
 117    }
 118
 119   p = priv->plane[2];
 120   s = priv->Cr;
 121   for (i=0; i<8; i+=2)
 122    {
 123      for (j=0; j<8; j+=1, s+=1)
 124        *p++ = *s;
 125      s += 8; /* Skip one line */
 126      p += priv->bytes_per_row[2] - 8;
 127    }
 128 }
 129
 130
 131 /**
 132  *  YCrCb -> YUV420P (1x2)
 133  *  .---.
 134  *  | 1 |
 135  *  |---|
 136  *  | 2 |
 137  *  `---'
 138  */
 139 static void YCrCB_to_YUV420P_1x2(struct jdec_private *priv)
 140 {
 141   const unsigned char *s, *y;
 142   unsigned char *p;
 143   int i,j;
 144
 145   p = priv->plane[0];
 146   y = priv->Y;
 147   for (i=0; i<16; i++)
 148    {
 149      memcpy(p, y, 8);
 150      p+=priv->bytes_per_row[0];
 151      y+=8;
 152    }
 153
 154   p = priv->plane[1];
 155   s = priv->Cb;
 156   for (i=0; i<8; i++)
 157    {
 158      for (j=0; j<8; j+=2, s+=2)
 159        *p++ = *s;
 160      p += priv->bytes_per_row[1] - 4;
 161    }
 162
 163   p = priv->plane[2];
 164   s = priv->Cr;
 165   for (i=0; i<8; i++)
 166    {
 167      for (j=0; j<8; j+=2, s+=2)
 168        *p++ = *s;
 169      p += priv->bytes_per_row[2] - 4;
 170    }
 171 }
 172
 173 /**
 174  *  YCrCb -> YUV420P (2x2)
 175  *  .-------.
 176  *  | 1 | 2 |
 177  *  |---+---|
 178  *  | 3 | 4 |
 179  *  `-------'
 180  */
 181 static void YCrCB_to_YUV420P_2x2(struct jdec_private *priv)
 182 {
 183   unsigned char *p;
 184   const unsigned char *s, *y1;
 185   int i;
 186
 187   p = priv->plane[0];
 188   y1 = priv->Y;
 189   for (i=0; i<16; i++)
 190    {
 191      memcpy(p, y1, 16);
 192      p += priv->bytes_per_row[0];
 193      y1 += 16;
 194    }
 195
 196   p = priv->plane[1];
 197   s = priv->Cb;
 198   for (i=0; i<8; i++)
 199    {
 200      memcpy(p, s, 8);
 201      s += 8;
 202      p += priv->bytes_per_row[1];
 203    }
 204
 205   p = priv->plane[2];
 206   s = priv->Cr;
 207   for (i=0; i<8; i++)
 208    {
 209      memcpy(p, s, 8);
 210      s += 8;
 211      p += priv->bytes_per_row[2];
 212    }
 213 }
 214
 215 static int initialize_yuv420p(struct jdec_private *priv,
 216                               unsigned int *bytes_per_blocklines,
 217                               unsigned int *bytes_per_mcu)
 218 {
 219   if (priv->components[0] == NULL)
 220     priv->components[0] = (uint8_t *)malloc(priv->width * priv->height);
 221   if (priv->components[1] == NULL)
 222     priv->components[1] = (uint8_t *)malloc(priv->width * priv->height/4);
 223   if (priv->components[2] == NULL)
 224     priv->components[2] = (uint8_t *)malloc(priv->width * priv->height/4);
 225   if (!priv->bytes_per_row[0])
 226     priv->bytes_per_row[0] = priv->width;
 227   if (!priv->bytes_per_row[1])
 228     priv->bytes_per_row[1] = priv->width/2;
 229   if (!priv->bytes_per_row[2])
 230     priv->bytes_per_row[2] = priv->width/2;
 231
 232   bytes_per_blocklines[0] = priv->bytes_per_row[0];
 233   bytes_per_blocklines[1] = priv->bytes_per_row[1]/2;
 234   bytes_per_blocklines[2] = priv->bytes_per_row[2]/2;
 235   bytes_per_mcu[0] = 8;
 236   bytes_per_mcu[1] = 4;
 237   bytes_per_mcu[2] = 4;
 238
 239   /* Return nonzero on failure */
 240   return !priv->components[0] || !priv->components[1] || !priv->components[2];
 241 }
 242
 243 static const struct tinyjpeg_colorspace format_yuv420p =
 244   {
 245     {
 246       YCrCB_to_YUV420P_1x1,
 247       YCrCB_to_YUV420P_1x2,
 248       YCrCB_to_YUV420P_2x1,
 249       YCrCB_to_YUV420P_2x2,
 250     },
 251     tinyjpeg_decode_mcu_3comp_table,
 252     initialize_yuv420p
 253   };
 254
 255 const tinyjpeg_colorspace_t TINYJPEG_FMT_YUV420P = &format_yuv420p;