src/image/accel.c

   1 /****************************************************************************
   2 *  Copyright (C) 1996 by Leo Khramov
   3 *  email:     old@sunct2.jinr.dubna.su
   4 *
   5 *  This program is free software; you can redistribute it and/or modify
   6 *  it under the terms of the GNU General Public License as published by
   7 *  the Free Software Foundation; either version 2 of the License, or
   8 *  (at your option) any later version.
   9 *
  10 *  This program is distributed in the hope that it will be useful,
  11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *  GNU General Public License for more details.
  14  ****************************************************************************/
  15 #include "accel.h"
  16 #include <X11/Xlib.h>
  17
  18 char *imd;
  19 void  (*im_coding)(unsigned int,unsigned int,unsigned int,char**);
  20 void im_truetruecoding(unsigned int ir,unsigned int ig,unsigned int ib,char **imdata)
  21 {
  22   int j;
  23   imd=*imdata;
  24   ir>>=red_rsh;
  25   ir<<=red_lsh;
  26   ig>>=green_rsh;
  27   ig<<=green_lsh;
  28   ib>>=blue_rsh;
  29   ib<<=blue_lsh;
  30   ir=ir | ig | ib;
  31   imd+=bdep;
  32   for(j=0;j<bdep;j++)
  33   {
  34      *(--imd)=(char)(ir & 0xff);
  35      ir>>=8;
  36   }
  37
  38   (*imdata)+=bdep;
  39 }
  40
  41 void im_truenocoding(unsigned int ir,unsigned int ig,unsigned int ib,char **imdata)
  42 {
  43  *((*imdata)++)=ir&0xff;
  44  *((*imdata)++)=ig&0xff;
  45  *((*imdata)++)=ib&0xff;
  46 }
  47
  48 char *im_alloc_true(int l,int h)
  49 {
  50    if (bdep == 1) {
  51       l *= 3;
  52    } else {
  53       l *= bdep;
  54       if (l % b_pad)
  55          l += b_pad - l % b_pad;
  56    }
  57    return (char*) malloc(l*h);
  58 }
  59
  60 void im_setzero(char* s,int len)
  61 {
  62   for ( ; len>0; len--)
  63     *s++ = 0;
  64 }
  65
  66 void im_memcopy(char *src, char* dest, int len)
  67 {
  68
  69   if (src==dest || len<=0)
  70     return;    /* nothin' to do */
  71
  72   if (src<dest && src+len>dest)
  73   {  /* do backward copy */
  74     src = src + len - 1;
  75     dest = dest + len - 1;
  76     for ( ; len>0; len--, src--, dest--)
  77       *dest = *src;
  78   }
  79
  80   else
  81   {
  82     for ( ; len>0; len--, src++, dest++)
  83       *dest = *src;
  84   }
  85 }
  86
  87
  88 extern int vclass;
  89
  90 unsigned int im_get_linew_true(unsigned int w)
  91 {
  92   unsigned line_w;
  93   if(vclass==TrueColor)
  94     {
  95       line_w = w * bdep;
  96       if (line_w % b_pad)
  97         line_w += b_pad - line_w % b_pad;
  98     } else
  99       line_w=w*3;  //24 bit non-converted images in PseudoColor before convertion.
 100   return line_w;
 101 }