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/* RCSid: $Id: rast.h,v 1.2 2003/07/14 22:24:00 schorsch Exp $ */ |
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/* |
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* Structures for line segment output to raster files |
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*/ |
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#ifndef _RAD_RAST_H_ |
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#define _RAD_RAST_H_ |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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#define NUMSCANS 16 /* number of scanlines per block */ |
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|
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typedef struct { /* raster scanline block */ |
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unsigned char *cols[NUMSCANS]; |
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int ybot, ytop; /* ybot is scan[0] */ |
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int xleft, xright; |
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int width; |
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} SCANBLOCK; |
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|
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extern int ydown; /* y going down? */ |
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extern int minwidth; /* minimum line width */ |
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|
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extern SCANBLOCK outblock; /* output span */ |
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|
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#define IBLK 0 /* index for black */ |
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#define IRED 1 |
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#define IGRN 2 |
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#define IBLU 3 |
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#define IYEL 4 |
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#define IMAG 5 |
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#define ICYN 6 |
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#define IWHT 7 |
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|
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#define pixtog(x,y,c) { register unsigned char \ |
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*cp = outblock.cols[(y)-outblock.ybot]+(x); \ |
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*cp = ((~*cp ^ (c)<<3)&070) | (*cp&07); } |
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|
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#define pixmix(x,y,c) (outblock.cols[(y)-outblock.ybot][x] &= 070|(c)) |
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#define someabove(p,y) (CONV((p)->xy[YMX],dysiz) > (y)) |
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#define somebelow(p,y) (CONV((p)->xy[YMN],dysiz) < (y)) |
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|
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#define inthis(p) (ydown ? someabove(p,outblock.ybot-1) : \ |
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somebelow(p,outblock.ytop+1)) |
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#define innext(p) (ydown ? somebelow(p,outblock.ybot) : \ |
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someabove(p,outblock.ytop)) |
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|
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _RAD_RAST_H_ */ |
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