Inside Macintosh: Imaging With QuickDraw /

Appendix A - Picture Opcodes

A Sample Version 2 Picture

The chapter "Pictures" in this book describes how to use the OpenPicture function, which creates version 2 pictures in color graphics ports. Figure A-1 on page A-23 shows a picture created with the OpenCPicture function using the code in Listing A-4 on page A-22. If the OpenPicture function were used instead of OpenCPicture, the same picture would be drawn, but the picture would use picture opcodes for the version 2 format instead of the extended version 2 format. The major difference between formats lies in the header information after the HeaderOp opcode.

Listing A-6 shows what happens when the picture in Figure A-1 is created in version 2 format, saved in a 'PICT' resource, and then decompiled with the DeRez decompiler.

Listing A-6 A decompiled version 2 picture

data 'PICT' (129) {
$"0078"     /* picture size; don't use this value for picture size */
$"0002 0002 006E 00AA"  /* bounding rectangle of picture */
$"0011"     /* VersionOp opcode; always $0011 for version 2 */
$"02FF"     /* Version opcode; always $02FF for version 2 */
$"0C00"     /* HeaderOp opcode; always $0C00 for version 2 */
            /* next 24 bytes contain header information */
   $"FFFF FFFF"   /* version; always -1 (long) for version 2 */
   $"0002 0000 0002 0000 00AA 0000 006E 0000"   /* fixed-point bounding 
                                                   rectangle for picture */
   $"0000 0000"   /* reserved */
$"001E"     /* DefHilite opcode to use default hilite color */
$"0001"     /* Clip opcode to define clipping region for picture */
   $"000A"  /* region size */
   $"0002 0002 006E 00AA"  /* bounding rectangle for clipping region */
$"000A"     /* FillPat opcode; fill pattern specifed in next 8 bytes */
   $"77DD 77DD 77DD 77DD"  /* fill pattern */
$"0034"     /* fillRect opcode; rectangle specified in next 8 bytes */
   $"0002 0002 006E 00AA"  /* rectangle to fill */
$"000A"     /* FillPat opcode; fill pattern specified in next 8 bytes */
   $"8822 8822 8822 8822"  /* fill pattern */
$"005C"     /* fillSameOval opcode */
$"0008"     /* PnMode opcode */
$  "0008"   /* pen mode data */
$"0071"     /* paintPoly opcode */
   $"001A"  /* size of polygon */
   $"0002 0002 006E 00AA"  /* bounding rectangle for polygon */
   $"006E 0002 0002 0054 006E 00AA 006E 0002"   /* polygon points */
$"00FF"     /* OpEndPic opcode; end of picture */
}