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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
unsigned char * simple_resize(unsigned char * orgin,
int ox, int oy, int dx, int dy)
{
unsigned char *cr, *p, *l;
int i, j, k, ip;
assert(cr = (unsigned char*)malloc(dx*dy*3));
l = cr;
for(j=0; j<dy; j++, l+=dx*3)
{
p = orgin + (j * oy/dy * ox * 3);
for(i=0, k=0; i<dx; i++, k+=3)
{
ip = i * ox/dx * 3;
l[k] = p[ip];
l[k+1] = p[ip+1];
l[k+2] = p[ip+2];
}
}
return cr;
}
unsigned char * alpha_resize(unsigned char * alpha, int ox, int oy, int dx, int dy)
{
unsigned char *cr,*p,*l;
int i,j,k;
assert(cr = (unsigned char*)malloc(dx*dy));
l = cr;
for(j=0; j<dy; j++,l+=dx)
{
p = alpha + (j * oy/dy * ox);
for(i=0,k=0; i<dx; i++)
l[k++] = p[i*ox/dx];
}
return cr;
}
unsigned char * color_average_resize(unsigned char * orgin, int ox, int oy, int dx, int dy)
{
unsigned char *cr,*p,*q;
int i,j,k,l,xa,xb,ya,yb;
int sq,r,g,b;
assert(cr=(unsigned char*) malloc(dx*dy*3)); p=cr;
for(j=0;j<dy;j++)
{
for(i=0;i<dx;i++,p+=3)
{
xa=i*ox/dx;
ya=j*oy/dy;
xb=(i+1)*ox/dx; if(xb>=ox) xb=ox-1;
yb=(j+1)*oy/dy; if(yb>=oy) yb=oy-1;
for(l=ya,r=0,g=0,b=0,sq=0;l<=yb;l++)
{
q=orgin+((l*ox+xa)*3);
for(k=xa;k<=xb;k++,q+=3,sq++)
{
r+=q[0]; g+=q[1]; b+=q[2];
}
}
p[0]=r/sq; p[1]=g/sq; p[2]=b/sq;
}
}
return cr;
}
unsigned char * rotate(unsigned char *i, int ox, int oy, int rot)
{
unsigned char * n, * p;
int x, y;
assert(n = (unsigned char*) malloc(ox * oy * 3));
switch(rot)
{
case 1: /* 90 deg right */
p = n + (oy - 1) * 3;
for(y = 0; y<oy; y++, p -= 3)
{
unsigned char * r = p;
for(x = 0; x<ox; x++, r += oy * 3)
{
r[0] = *(i++);
r[1] = *(i++);
r[2] = *(i++);
}
}
break;
case 2: /* 180 deg */
i += ox * oy * 3; p = n;
for(y = ox * oy; y > 0; y--)
{
i -= 3;
p[0] = i[0];
p[1] = i[1];
p[2] = i[2];
p += 3;
}
break;
case 3: /* 90 deg left */
p = n;
for(y = 0; y<oy; y++, p += 3)
{
unsigned char * r = p + ((ox * 3) * oy);
for(x = 0; x<ox; x++)
{
r -= oy * 3;
r[0] = *(i++);
r[1] = *(i++);
r[2] = *(i++);
}
}
break;
}
return n;
}
unsigned char * alpha_rotate(unsigned char *i, int ox, int oy, int rot)
{
unsigned char * n, * p;
int x, y;
assert(n = (unsigned char*) malloc(ox * oy));
switch(rot)
{
case 1: /* 90 deg right */
p = n + (oy - 1);
for(y = 0; y<oy; y++, p --)
{
unsigned char * r = p;
for(x = 0; x<ox; x++, r += oy)
*r = *(i++);
}
break;
case 2: /* 180 deg */
i += ox * oy; p = n;
for(y = ox * oy; y > 0; y--)
*(p++) = *(i--);
break;
case 3: /* 90 deg left */
p = n;
for(y = 0; y<oy; y++, p++)
{
unsigned char * r = p + (ox * oy);
for(x = 0; x<ox; x++)
{
r -= oy;
*r = *(i++);
}
}
break;
}
return n;
}
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