tileset 0.0.2

Tailset definition, and supports importing multiple formats
Documentation 
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use image::error::{LimitError, LimitErrorKind};
use image::{ImageError, ImageResult, RgbaImage, SubImage};

use rand_core::RngCore;


pub trait GridAtlas {
    fn cell_size(&self) -> u32;
    fn get_cell(&self, a: bool, b: bool, c: bool, d: bool, n: u32) -> SubImage<&RgbaImage>;
    /// Get a tile by side relation mask.
    #[inline]
    fn get_side_random<R>(&self, a: bool, b: bool, c: bool, d: bool, rng: &mut R) -> SubImage<&RgbaImage> where R: RngCore {
        self.get_cell(a, b, c, d, rng.next_u32())
    }
}

pub fn dimension_error<T>() -> ImageResult<T> {
    Err(ImageError::Limits(LimitError::from_kind(LimitErrorKind::DimensionError)))
}

pub fn check_width_divide_by_16(image: &RgbaImage) {
    assert_eq!(image.width() % 16, 0, "image width {} does not divide by 16", image.width());
    let cell_size = image.width() / 16;
    assert_eq!(image.height() % cell_size, 0, "image height {} does not divide by cell size {}", image.height(), cell_size);
}

pub fn check_wang4x4(wang: &RgbaImage) -> ImageResult<u32> {
    let cell_size = wang.width() / 4;
    if wang.width() % 4 != 0 || wang.width() != wang.height() {
        dimension_error()?
    }
    Ok(cell_size)
}