IMAGE *apply_filter(IMAGE *original, FILTER *filter) {
IMAGE *result = image_create_blank(original);
int x, y;
for(y = 0; y < original->height; y++)
for(x = 0; x < original->width; x++)
apply_to_pixel(x, y, original, result, filter);
return result;
}
IMAGE *master_recv_blur(IMAGE *src, int radius, int n_slaves)
{
//Allocate mem for the new image
IMAGE *result = image_create_blank(src);
//Copy first and last "radius" rows
int i, j;
for(i = 0; i < radius; i++)
for(j = 0; j < src->width; j++) {
(result->pixels)[i][j] = (src->pixels)[i][j];
(result->pixels)[src->height-1-i][j] = (src->pixels)[src->height-1-i][j];
}
//Init metadata
METADATA meta;
meta_init(&meta, src->width, src->height, 0, radius, 0);
//Prepare pixel type
MPI_Datatype PIXEL;
create_pixel_type(&PIXEL);
//Calculate the total data size(ignoring the endges)
int data_size = src->height - 2*meta.radius;
int index = 0;
const int max_size = src->height / n_slaves;
//Update and send the metadata
for(i = 0; i < n_slaves && data_size != 0; i++) {
//Update metadata
master_update_metadata(&meta, &data_size, max_size);
//Recv data
recv_subimage(result, &PIXEL, i+1, index+radius, meta.height-radius);
//Update index
index += meta.height - 2*meta.radius;
}
return result;
}
