winamp/Src/Plugins/Visualization/vis_avs/linedraw.cpp
2024-09-24 14:54:57 +02:00

262 lines
5.9 KiB
C++

/*
LICENSE
-------
Copyright 2005 Nullsoft, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of Nullsoft nor the names of its contributors may be used to
endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <windows.h>
#include "r_defs.h"
#include <math.h>
#define SWAP(x,y,temp) ( temp ) = ( x ); ( x ) = ( y ); ( y ) = ( temp )
#define ABS(x) (( x ) < 0 ? - ( x ) : ( x ))
void line(int *fb, int x1,int y1,int x2,int y2, int width, int height, int color, int lw)
{
int dy = ABS(y2-y1);
int dx = ABS(x2-x1);
#ifdef LASER
lw=1;
#define BLEND_LINE(fb,color) (*(fb)=BLEND(*(fb),(color)))
#else
if (lw<1) lw=1;
else if (lw>255)lw=255;
#endif
int lw2=lw/2;
if (!dx) // optimize vertical draw
{
x1-=lw2;
if (x1+lw >= 0 && x1 < width)
{
int d=max(min(y1,y2),0);
int ye=min(max(y1,y2),height-1);
if (x1<0)
{
lw+=x1;
x1=0;
}
if (x1+lw >= width) lw=width-x1;
fb += d*width+x1;
width-=lw;
if (lw>0) while (d++ < ye)
{
int x=lw;
while (x--) { BLEND_LINE(fb, color); fb++; }
fb+=width;
}
}
return;
}
if (y1==y2) // optimize horizontal draw.
{
y1-=lw2;
if (y1+lw >= 0 && y1 < height)
{
int d=max(min(x1,x2),0);
int xe=min(max(x1,x2),width-1);
if (y1<0)
{
lw+=y1;
y1=0;
}
if (y1+lw >= height) lw=height-y1;
fb+=y1*width+d;
width-=xe-d;
int y=lw;
while (y--)
{
int lt=d;
while (lt++<xe) { BLEND_LINE(fb,color); fb++; }
fb+=width;
}
}
return;
}
if (dy <= dx) // x major, low slope
{
// first things first for better line drawing, let's see if we can't get the
// width calculated right.
// lw is the width in pixels. if dy = 0, then lw=lw. if dy=dx, then:
/*
__________ C=30d
|\
| \ lw
| \_____ A=90d
? | /
| / pc2
|/ ____ B = 60d
tan(C) = sin(C)/cos(C) = (dy / dx)
cos(C) = lw / ?
sin(C)/(lw / ? ) = (dy / dx)
sin(C) * ? / lw = (dy/dx)
sin(C) * ? = lw * dy/dx;
? = lw * dy/dx / sin(C)
cos(C) = lw / ? === ? = lw / cos(C)
tan(C) = dy / dx;
C = atan2(dy,dx);
? = lw / cos(C)
*/
#if 0// lame
if (lw>1 && (GetAsyncKeyState(VK_SHIFT)&0x8000)){
double d=atan2((double)dy,(double)dx);
lw = (int) (lw / cos(d));
if (lw<1)lw=1;
}
#endif
if (x2 < x1)
{
int temp;
SWAP(x1,x2,temp);
SWAP(y1,y2,temp);
}
int yincr = y2>y1?1:-1;
int offsincr= y2>y1?width:-width;
y1-=lw2;
int offs = y1 * width + x1;
int d = dy + dy - dx;
int Eincr = dy + dy;
int NEincr = d - dx;
if (x2 >= 0 && x1 < width)
{
if (x1<0)
{
int v;
v=yincr * -x1;
if (dx) v= (v * dy)/dx;
y1 += v;
offs += v*width - x1;
x1=0;
}
if (x2 > width) x2=width;
while (x1<x2)
{
int yp=y1;
int ype=y1+lw;
int *newfb=fb+offs;
if (yp < 0)
{
newfb-=yp*width;
yp=0;
}
if (ype>height) ype=height;
while (yp++ < ype)
{
BLEND_LINE(newfb,color);
newfb+=width;
}
if (d < 0) d += Eincr;
else
{
d += NEincr;
y1 += yincr;
offs += offsincr;
}
offs++;
x1++;
}
}
}
else
{
#if 0//lame
if (lw>1 && (GetAsyncKeyState(VK_SHIFT)&0x8000)){
double d=atan2((double)dx,(double)dy);
lw = (int) (lw / cos(d));
if (lw<1)lw=1;
}
#endif
if (y2 < y1)
{
int temp;
SWAP(x1,x2,temp);
SWAP(y1,y2,temp);
}
int yincr=(x2>x1)?1:-1;
int d = dx + dx - dy;
int Eincr = dx + dx;
int NEincr = d - dy;
x1-=lw2;
int offs = y1 * width + x1;
if (y2 >= 0 && y1 < height)
{
if (y1<0)
{
int v;
v=yincr * -y1;
if (dy) v= (v * dx)/dy;
x1 += v;
offs += v - y1*width;
y1=0;
}
if (y2 > height) y2 = height;
while (y1 < y2)
{
int xp=x1;
int xpe=x1+lw;
int *newfb=fb+offs;
if (xp<0)
{
newfb-=xp;
xp=0;
}
if (xpe > width) xpe=width;
while (xp++ < xpe) { BLEND_LINE(newfb, color); newfb++; }
if (d < 0) d += Eincr;
else
{
d += NEincr;
x1 += yincr;
offs += yincr;
}
offs += width;
y1++;
}
}
}
}