vx32

Local 9vx git repository for patches.
git clone git://r-36.net/vx32
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arith.c (2469B)

      1 #include "u.h"
      2 #include "lib.h"
      3 #include "draw.h"
      4 
      5 Point
      6 Pt(int x, int y)
      7 {
      8 	Point p;
      9 
     10 	p.x = x;
     11 	p.y = y;
     12 	return p;
     13 }
     14 
     15 Rectangle
     16 Rect(int x, int y, int bx, int by)
     17 {
     18 	Rectangle r;
     19 
     20 	r.min.x = x;
     21 	r.min.y = y;
     22 	r.max.x = bx;
     23 	r.max.y = by;
     24 	return r;
     25 }
     26 
     27 Rectangle
     28 Rpt(Point min, Point max)
     29 {
     30 	Rectangle r;
     31 
     32 	r.min = min;
     33 	r.max = max;
     34 	return r;
     35 }
     36 
     37 Point
     38 addpt(Point a, Point b)
     39 {
     40 	a.x += b.x;
     41 	a.y += b.y;
     42 	return a;
     43 }
     44 
     45 Point
     46 subpt(Point a, Point b)
     47 {
     48 	a.x -= b.x;
     49 	a.y -= b.y;
     50 	return a;
     51 }
     52 
     53 Rectangle
     54 insetrect(Rectangle r, int n)
     55 {
     56 	r.min.x += n;
     57 	r.min.y += n;
     58 	r.max.x -= n;
     59 	r.max.y -= n;
     60 	return r;
     61 }
     62 
     63 Point
     64 divpt(Point a, int b)
     65 {
     66 	a.x /= b;
     67 	a.y /= b;
     68 	return a;
     69 }
     70 
     71 Point
     72 mulpt(Point a, int b)
     73 {
     74 	a.x *= b;
     75 	a.y *= b;
     76 	return a;
     77 }
     78 
     79 Rectangle
     80 rectsubpt(Rectangle r, Point p)
     81 {
     82 	r.min.x -= p.x;
     83 	r.min.y -= p.y;
     84 	r.max.x -= p.x;
     85 	r.max.y -= p.y;
     86 	return r;
     87 }
     88 
     89 Rectangle
     90 rectaddpt(Rectangle r, Point p)
     91 {
     92 	r.min.x += p.x;
     93 	r.min.y += p.y;
     94 	r.max.x += p.x;
     95 	r.max.y += p.y;
     96 	return r;
     97 }
     98 
     99 int
    100 eqpt(Point p, Point q)
    101 {
    102 	return p.x==q.x && p.y==q.y;
    103 }
    104 
    105 int
    106 eqrect(Rectangle r, Rectangle s)
    107 {
    108 	return r.min.x==s.min.x && r.max.x==s.max.x &&
    109 	       r.min.y==s.min.y && r.max.y==s.max.y;
    110 }
    111 
    112 int
    113 rectXrect(Rectangle r, Rectangle s)
    114 {
    115 	return r.min.x<s.max.x && s.min.x<r.max.x &&
    116 	       r.min.y<s.max.y && s.min.y<r.max.y;
    117 }
    118 
    119 int
    120 rectinrect(Rectangle r, Rectangle s)
    121 {
    122 	return s.min.x<=r.min.x && r.max.x<=s.max.x && s.min.y<=r.min.y && r.max.y<=s.max.y;
    123 }
    124 
    125 int
    126 ptinrect(Point p, Rectangle r)
    127 {
    128 	return p.x>=r.min.x && p.x<r.max.x &&
    129 	       p.y>=r.min.y && p.y<r.max.y;
    130 }
    131 
    132 Rectangle
    133 canonrect(Rectangle r)
    134 {
    135 	int t;
    136 	if (r.max.x < r.min.x) {
    137 		t = r.min.x;
    138 		r.min.x = r.max.x;
    139 		r.max.x = t;
    140 	}
    141 	if (r.max.y < r.min.y) {
    142 		t = r.min.y;
    143 		r.min.y = r.max.y;
    144 		r.max.y = t;
    145 	}
    146 	return r;
    147 }
    148 
    149 void
    150 combinerect(Rectangle *r1, Rectangle r2)
    151 {
    152 	if(r1->min.x > r2.min.x)
    153 		r1->min.x = r2.min.x;
    154 	if(r1->min.y > r2.min.y)
    155 		r1->min.y = r2.min.y;
    156 	if(r1->max.x < r2.max.x)
    157 		r1->max.x = r2.max.x;
    158 	if(r1->max.y < r2.max.y)
    159 		r1->max.y = r2.max.y;
    160 }
    161 
    162  ulong
    163 drawld2chan[] = {
    164 	GREY1,
    165 	GREY2,
    166 	GREY4,
    167 	CMAP8,
    168 };
    169 
    170 
    171 ulong
    172 setalpha(ulong color, uchar alpha)
    173 {
    174 	int red, green, blue;
    175 
    176 	red = (color >> 3*8) & 0xFF;
    177 	green = (color >> 2*8) & 0xFF;
    178 	blue = (color >> 1*8) & 0xFF;
    179 	/* ignore incoming alpha */
    180 	red = (red * alpha)/255;
    181 	green = (green * alpha)/255;
    182 	blue = (blue * alpha)/255;
    183 	return (red<<3*8) | (green<<2*8) | (blue<<1*8) | (alpha<<0*8);
    184 }
    185 
    186 Point	ZP;
    187 Rectangle ZR;