Question

How do you enlarge an image in C?

int enlarge(PIXEL* original, int rows, int cols, int scale,
   PIXEL** new, int* newrows, int* newcols)
{
/* FILL OUT */
return 0;
}

Answer 1

int enlarge(PIXEL* original, int rows, int cols, int scale, PIXEL** new, int* newrows, int* newcols) {
    *newcols = cols * scale;
    *newrows = rows * scale;
    *new = (PIXEL*)malloc( (*newrows)*(*newcols) * sizeof(PIXEL));
    int row, col,y,x;
    for (row = 0; row < rows; row++ )
        for (col = 0; col < cols; col++ ){
            PIXEL* o = original + row*cols + col;
            for(y = 0; y < scale; y++ )
                for( x = 0; x < scale; x++ ){ 
                    PIXEL* n = (*new)+(scale*row)*(*newcols)+(scale*col)+(y*(*newcols))+x;
                    *n = *o;
                }
        }
    return 0;    
}