ds_grid_trim

/// @func ds_grid_trim
/// @arg {grid} grid
/// @desc Resizes the grid, trimming empty (non-zero) contiguous rows/columns
// Requires ds_grid_get_bounds

enum rect{
    x1,
    y1,
    x2,
    y2
}
var _grid = argument[0];

var _dimArr = ds_grid_get_bounds(_grid);
var _trimmedGridW = _dimArr[rect.x2] - _dimArr[rect.x1] + 1;
var _trimmedGridH = _dimArr[rect.y2] - _dimArr[rect.y1] + 1;
var _trimmedGrid = ds_grid_create(_trimmedGridW,_trimmedGridH);

ds_grid_set_grid_region(_trimmedGrid,_grid,_dimArr[rect.x1],_dimArr[rect.y1],_dimArr[rect.x2],_dimArr[rect.y2],0,0);
ds_grid_resize(_grid,_trimmedGridW,_trimmedGridH);
ds_grid_clear(_grid,0);
ds_grid_copy(_grid,_trimmedGrid);

ds_grid_destroy(_trimmedGrid);