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shrink.c
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#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "aalib.h"
#include "image.h"
#include "shrink.h"
typedef double atype;
static atype xstep, ystep;
static atype max;
static int fast;
static int getval(atype x, atype y)
{
atype xe = x + xstep, ye = y + ystep;
atype ycount, xcount = 0;
int xi, yi, xie = floor(xe), yie = floor(ye);
ycount = 0;
if (x < 0 || x + xstep > imgwidth || y < 0 || y + ystep > imgheight)
return 0;
if (fast) {
xi = x;
yi = y;
xi = imgdata[xi + yi * imgwidth];
} else {
for (yi = y; yi <= yie; yi++) {
xcount = 0;
xi = x;
xcount += (((int) imgdata[xi + yi * imgwidth])) * (1.0 - x + floor(x));
xi++;
for (; xi <= xie; xi++)
xcount += (((int) imgdata[xi + yi * imgwidth]));
xi--;
/*if(xie!=floor(xie)) */
xcount -= (((int) imgdata[xi + yi * imgwidth])) * (1.0 - xe + floor(xe));
if (yi == (int) y)
ycount += xcount * (1.0 - y + floor(y));
else
ycount += xcount;
/*printw("%f %f %f %i\n",xcount,ycount,x,xie); */
}
/*if(yie!=floor(yie)) */
ycount -= xcount * (1.0 - ye + floor(ye));
xi = 256 * ycount / max;
}
if (xi < 0)
xi = 0;
if (xi > 255)
xi = 255;
return (xi);
}
void fastscale(char *b1, char *b2, int x1, int x2, int y1, int y2, int width1, int width2)
{
int ddx1, ddx, spx = 0, ex;
int ddy1, ddy, spy = 0, ey;
int x;
char *bb1=b1;
width2 -= x2;
if(!x1||!x2||!y1||!y2) return;
ddx = x1 + x1;
ddx1 = x2 + x2;
if (ddx1 < ddx)
spx = ddx / ddx1, ddx %= ddx1;
ddy = y1 + y1;
ddy1 = y2 + y2;
if (ddy1 < ddy)
spy = (ddy / ddy1)*width1, ddy %= ddy1;
ey = -ddy1;
for (; y2; y2--) {
ex = -ddx1;
for (x = x2; x; x--) {
*b2 = *b1;
b2++;
b1 += spx;
ex += ddx;
if (ex > 0) {
b1++;
ex -= ddx1;
}
}
b2 += width2;
bb1 += spy;
ey += ddy;
if (ey > 0) {
bb1 += width1;
ey -= ddy1;
}
b1=bb1;
}
}
void shrink(aa_context * c, int fast1, int x1, int y1, int x2, int y2)
{
int x, y;
int width = aa_imgwidth(c);
int height = aa_imgheight(c);
if(x2<0||x1>=imgwidth||y2<0||y1>=imgheight) {
memset(c->imagebuffer,0,aa_imgwidth(c)*aa_imgheight(c));
return;
}
if (fast) {
if(x1<0||y1<0||x2>=imgwidth||y2>=imgheight)
{ int xx1=0,xx2=aa_imgwidth(c)-1,yy1=0,yy2=aa_imgheight(c)-1;
memset(c->imagebuffer,0,aa_imgwidth(c)*aa_imgheight(c));
xstep = ((atype) width) / (x2 - x1 - 1) ;
ystep = ((atype) height) / (y2 - y1 - 1) ;
if(x2>=imgwidth) {
xx2=(imgwidth-1-x1)*xstep;
x2=imgwidth-1;
}
if(y2>=imgheight) {
yy2=(imgheight-1-y1)*ystep;
y2=imgheight-1;
}
if(x1<0) {
xx1=-xstep*x1;
x1=0;
}
if(y1<0) {
yy1=-ystep*y1;
y1=0;
}
fastscale(imgdata + x1 + imgwidth * y1, c->imagebuffer+xx1+yy1*width, x2 - x1, xx2-xx1, y2 - y1, yy2-yy1, imgwidth, aa_imgwidth(c));
return;
}
else
fastscale(imgdata + x1 + imgwidth * y1, c->imagebuffer, x2 - x1, aa_imgwidth(c), y2 - y1, aa_imgheight(c), imgwidth, aa_imgwidth(c));
return;
}
fast = fast1;
xstep = (x2 - x1 - 1) / (atype) (width);
ystep = (y2 - y1 - 1) / (atype) (height);
max = xstep * ystep * 256;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
atype xp = x1 + xstep * x, yp = y1 + ystep * y;
aa_putpixel(c, x, y, getval(xp, yp));
}
}
}