Microsoft KB Archive/39215

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Pattern Format for _setfillmask()

Q39215

5.10 6.00 6.00a 6.00ax 7.00 | 5.10 6.00 6.00a | 1.00 1.50 MS-DOS | OS/2 | WINDOWS kbprg ---------------------------------------------------------------------- The information in this article applies to: - The C Run-time (CRT), included with: - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a, and 6.0ax - Microsoft C for OS/2, versions 5.1, 6.0, and 6.0a - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 ---------------------------------------------------------------------- SUMMARY ======= The _setfillmask() function sets a background pattern using repeated 8-by-8 pixel patterns. The mask consists of an 8-byte character array. MORE INFORMATION ================ The following example illustrates a pixel pattern: Powers of 2 decimal: 128 64 32 16 08 04 02 01 hex: 80 40 20 10 08 04 02 01 -------------------------------- byte 1 | 1 1 1 1 = 0x66 byte 2 | 1 1 1 1 = 0x66 byte 3 | = 0x00 byte 4 | 1 = 0x08 byte 5 | 1 1 = 0x18 byte 6 | 1 1 = 0x81 byte 7 | 1 1 = 0x42 byte 8 | 1 1 1 1 = 0x3C The character array for this particular fill mask would be declared in a C program as follows: unsigned char *maskarray = "\x66\x66\x00\x08\x18\x81\x42\x3C"; When the fill mask above is used with _setfillmask() and a graphics function such as _rectangle() or _ellipse(), the pattern creates a continuous field of faces. Additional reference words: kbinf 5.10 6.00 6.00a 6.00ax 7.00 1.00 1.50 KBCategory: kbprg KBSubcategory: CRTIss GraphicsIss

Keywords : kb16bitonly
Issue type :
Technology : kbVCsearch kbAudDeveloper kbCRT


Last Reviewed: May 5, 2001
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