fbgrab-bigendian.patch

   1 --- fbgrab-1.0/fbgrab.c 2002-04-15 22:22:54.000000000 +0200
   2 +++ fbgrab-1.0/fbgrab.c.new     2006-07-14 02:46:49.000000000 +0200
   3 @@ -163,15 +163,17 @@
   4
   5      for (i=0; i < (unsigned int) height*width*2; i+=2)
   6      {
   7 -       /* BLUE  = 0 */
   8 -       outbuffer[(i<<1)+0] = (inbuffer[i] & 0x1f) << 3;
   9 -       /* GREEN = 1 */
  10 -        outbuffer[(i<<1)+1] = (((inbuffer[i+1] & 0x7) << 3) |
  11 -                            (inbuffer[i] & 0xE0) >> 5) << 2;
  12 -        /* RED   = 2 */
  13 -       outbuffer[(i<<1)+2] = (inbuffer[i+1] & 0xF8);
  14 -       /* ALPHA = 3 */
  15 -       outbuffer[(i<<1)+3] = '\0';
  16 +       int16_t v =
  17 +#ifdef __BIG_ENDIAN__
  18 +               (inbuffer[i] << 8) + inbuffer[i+1];
  19 +#else
  20 +               (inbuffer[i+1] << 8) + inbuffer[i];
  21 +#endif
  22 +
  23 +       outbuffer[(i<<1)+0] = (v << 3) & 0xf8; /* B */
  24 +       outbuffer[(i<<1)+1] = (v >> 3) & 0xfc; /* G */
  25 +       outbuffer[(i<<1)+2] = (v >> 8) & 0xf8; /* R */
  26 +       outbuffer[(i<<1)+3] = 0; /* A */
  27      }
  28  }
  29
  30 @@ -194,6 +196,22 @@
  31      }
  32  }
  33
  34 +static void convertARGBtoBGRA(int width, int height,
  35 +                          unsigned char *inbuffer,
  36 +                          unsigned char *outbuffer)
  37 +{
  38 +    unsigned int i;
  39 +
  40 +    for (i=0; i < (unsigned int) height*width*4; i+=4)
  41 +    {
  42 +        outbuffer[i+0] = inbuffer[i+3];
  43 +        outbuffer[i+1] = inbuffer[i+2];
  44 +        outbuffer[i+2] = inbuffer[i+1];
  45 +        outbuffer[i+3] = inbuffer[i+0];
  46 +    }
  47 +}
  48 +
  49 +
  50  static void write_PNG(unsigned char *outbuffer, char *filename,
  51                                 int width, int height, int interlace)
  52  {
  53 @@ -283,8 +301,13 @@
  54         write_PNG(outbuffer, filename, width, height, interlace);
  55         break;
  56      case 32:
  57 +#ifdef __BIG_ENDIAN__
  58 +       convertARGBtoBGRA(width, height, inbuffer, outbuffer);
  59 +       write_PNG(outbuffer, filename, width, height, interlace);
  60 +#else
  61         /* No conversion needed */
  62         write_PNG(inbuffer, filename, width, height, interlace);
  63 +#endif
  64         break;
  65      default:
  66         fprintf(stderr, "%d bits per pixel are not supported! ", bits);