void image_dct(INT32 args)
{
rgbd_group *area,*val;
struct object *o;
struct image *img;
INT32 x,y,u,v;
double xsz2,ysz2,enh,xp,yp,dx,dy;
double *costbl;
rgb_group *pix;
CHECK_INIT();
get_all_args(NULL, args, "%d%d", &x, &y);
x = MAXIMUM(1, x);
y = MAXIMUM(1, y);
#ifdef DCT_DEBUG
fprintf(stderr,"%lu bytes, %lu bytes\n",
(unsigned long)(sizeof(rgbd_group)*THIS->xsize*THIS->ysize),
(unsigned long)(sizeof(rgb_group)*THIS->xsize*THIS->ysize+1));
#endif
area=xalloc(sizeof(rgbd_group)*THIS->xsize*THIS->ysize+1);
if (!(costbl=malloc(sizeof(double)*THIS->xsize+1)))
{
free(area);
out_of_memory_error(NULL, -1, 0);
}
o=clone_object(image_program,0);
img=(struct image*)(o->storage);
*img=*THIS;
img->xsize = x;
img->ysize = y;
if (!(img->img=malloc(sizeof(rgb_group)*
img->xsize*img->ysize+RGB_VEC_PAD)))
{
free(area);
free(costbl);
free_object(o);
out_of_memory_error(NULL, -1, 0);
}
xsz2=THIS->xsize*2.0;
ysz2=THIS->ysize*2.0;
enh=(8.0/THIS->xsize)*(8.0/THIS->ysize);
for (u=0; u<THIS->xsize; u++)
{
double d,z0;
rgbd_group sum;
for (v=0; v<THIS->ysize; v++)
{
d=(u?1:c0)*(v?1:c0)/4.0;
sum.r=sum.g=sum.b=0;
pix=THIS->img;
for (x=0; x<THIS->xsize; x++)
costbl[x]=cos( (2*x+1)*u*pi/xsz2 );
for (y=0; y<THIS->ysize; y++)
{
z0=cos( (2*y+1)*v*pi/ysz2 );
for (x=0; x<THIS->xsize; x++)
{
double z;
z = costbl[x] * z0;
sum.r += (float)(pix->r*z);
sum.g += (float)(pix->g*z);
sum.b += (float)(pix->b*z);
pix++;
}
}
sum.r *= (float)d;
sum.g *= (float)d;
sum.b *= (float)d;
area[u+v*THIS->xsize]=sum;
}
#ifdef DCT_DEBUG
fprintf(stderr,"."); fflush(stderr);
#endif
}
#ifdef DCT_DEBUG
fprintf(stderr,"\n");
#endif
dx=((double)(THIS->xsize-1))/(img->xsize);
dy=((double)(THIS->ysize-1))/(img->ysize);
pix=img->img;
for (y=0,yp=0; y<img->ysize; y++,yp+=dy)
{
double z0;
rgbd_group sum;
for (x=0,xp=0; x<img->xsize; x++,xp+=dx)
{
sum.r=sum.g=sum.b=0;
val=area;
for (u=0; u<THIS->xsize; u++)
costbl[u]=cos( (2*xp+1)*u*pi/xsz2 );
for (v=0; v<THIS->ysize; v++)
{
z0=cos( (2*yp+1)*v*pi/ysz2 )*(v?1:c0)/4.0;
for (u=0; u<THIS->xsize; u++)
{
double z;
z = (u?1:c0) * costbl[u] * z0;
sum.r += (float)(val->r*z);
sum.g += (float)(val->g*z);
sum.b += (float)(val->b*z);
val++;
}
}
sum.r *= (float)enh;
sum.g *= (float)enh;
sum.b *= (float)enh;
pix->r=testrange((int)(sum.r+0.5));
pix->g=testrange((int)(sum.g+0.5));
pix->b=testrange((int)(sum.b+0.5));
pix++;
}
#ifdef DCT_DEBUG
fprintf(stderr,"."); fflush(stderr);
#endif
}
free(area);
free(costbl);
pop_n_elems(args);
push_object(o);
}
void image_dct(INT32 args)
{
rgbd_group *area,*val;
struct object *o;
struct image *img;
INT32 x,y,u,v;
double xsz2,ysz2,enh,xp,yp,dx,dy;
double *costbl;
rgb_group *pix;
if (!THIS->img)
Pike_error("Called Image.Image object is not initialized\n");
#ifdef DCT_DEBUG
fprintf(stderr,"%lu bytes, %lu bytes\n",
DO_NOT_WARN((unsigned long)(sizeof(rgbd_group)*THIS->xsize*THIS->ysize)),
DO_NOT_WARN((unsigned long)(sizeof(rgb_group)*THIS->xsize*THIS->ysize+1)));
#endif
area=xalloc(sizeof(rgbd_group)*THIS->xsize*THIS->ysize+1);
if (!(costbl=malloc(sizeof(double)*THIS->xsize+1)))
{
free(area);
resource_error(NULL,0,0,"memory",0,"Out of memory.\n");
}
o=clone_object(image_program,0);
img=(struct image*)(o->storage);
*img=*THIS;
if (args>=2
&& sp[-args].type==T_INT
&& sp[1-args].type==T_INT)
{
img->xsize=MAXIMUM(1,sp[-args].u.integer);
img->ysize=MAXIMUM(1,sp[1-args].u.integer);
}
else {
free(area);
free(costbl);
free_object(o);
bad_arg_error("image->dct",sp-args,args,0,"",sp-args,
"Bad arguments to image->dct()\n");
}
if (!(img->img=(rgb_group*)malloc(sizeof(rgb_group)*
img->xsize*img->ysize+1)))
{
free(area);
free(costbl);
free_object(o);
resource_error(NULL,0,0,"memory",0,"Out of memory.\n");
}
xsz2=THIS->xsize*2.0;
ysz2=THIS->ysize*2.0;
enh=(8.0/THIS->xsize)*(8.0/THIS->ysize);
for (u=0; u<THIS->xsize; u++)
{
double d,z0;
rgbd_group sum;
for (v=0; v<THIS->ysize; v++)
{
d=(u?1:c0)*(v?1:c0)/4.0;
sum.r=sum.g=sum.b=0;
pix=THIS->img;
for (x=0; x<THIS->xsize; x++)
costbl[x]=cos( (2*x+1)*u*pi/xsz2 );
for (y=0; y<THIS->ysize; y++)
{
z0=cos( (2*y+1)*v*pi/ysz2 );
for (x=0; x<THIS->xsize; x++)
{
double z;
z = costbl[x] * z0;
sum.r += (float)(pix->r*z);
sum.g += (float)(pix->g*z);
sum.b += (float)(pix->b*z);
pix++;
}
}
sum.r *= (float)d;
sum.g *= (float)d;
sum.b *= (float)d;
area[u+v*THIS->xsize]=sum;
}
#ifdef DCT_DEBUG
fprintf(stderr,"."); fflush(stderr);
#endif
}
#ifdef DCT_DEBUG
fprintf(stderr,"\n");
#endif
dx=((double)(THIS->xsize-1))/(img->xsize);
dy=((double)(THIS->ysize-1))/(img->ysize);
pix=img->img;
for (y=0,yp=0; y<img->ysize; y++,yp+=dy)
{
double z0;
rgbd_group sum;
for (x=0,xp=0; x<img->xsize; x++,xp+=dx)
{
sum.r=sum.g=sum.b=0;
val=area;
for (u=0; u<THIS->xsize; u++)
costbl[u]=cos( (2*xp+1)*u*pi/xsz2 );
for (v=0; v<THIS->ysize; v++)
{
z0=cos( (2*yp+1)*v*pi/ysz2 )*(v?1:c0)/4.0;
for (u=0; u<THIS->xsize; u++)
{
double z;
z = (u?1:c0) * costbl[u] * z0;
sum.r += DO_NOT_WARN((float)(val->r*z));
sum.g += DO_NOT_WARN((float)(val->g*z));
sum.b += DO_NOT_WARN((float)(val->b*z));
val++;
}
}
sum.r *= (float)enh;
sum.g *= (float)enh;
sum.b *= (float)enh;
pix->r=testrange((DOUBLE_TO_INT(sum.r+0.5)));
pix->g=testrange((DOUBLE_TO_INT(sum.g+0.5)));
pix->b=testrange((DOUBLE_TO_INT(sum.b+0.5)));
pix++;
}
#ifdef DCT_DEBUG
fprintf(stderr,"."); fflush(stderr);
#endif
}
free(area);
free(costbl);
pop_n_elems(args);
push_object(o);
}
