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use image::ImageBuffer;
use image::Rgba;
pub const REGION_SIZE: usize = 16 * 8;
pub const CHUNK_HEIGHT: usize = 320;
pub const CHUNK_SIZE: usize = 16;
pub fn image_buffer_blit(
target: &mut ImageBuffer<Rgba<u8>, Vec<u8>>,
source: &ImageBuffer<Rgba<u8>, Vec<u8>>,
offset: (isize, isize),
) {
for (x, y, source_pixel) in source.enumerate_pixels() {
let tx = x as isize + offset.0;
let ty = y as isize + offset.1;
if tx >= 0 && tx < target.width() as isize && ty >= 0 && ty < target.height() as isize {
let target_pixel = target.get_pixel_mut(tx as u32, ty as u32);
let sa = source_pixel.0[3] as u16;
let new_pixel = Rgba::from([
((target_pixel.0[0] as u16 * (255 - sa)) / 255
+ (source_pixel.0[0] as u16 * sa) / 255) as u8,
((target_pixel.0[1] as u16 * (255 - sa)) / 255
+ (source_pixel.0[1] as u16 * sa) / 255) as u8,
((target_pixel.0[2] as u16 * (255 - sa)) / 255
+ (source_pixel.0[2] as u16 * sa) / 255) as u8,
255 - (((255 - target_pixel.0[3] as u16) * (255 - sa)) / 255) as u8,
]);
*target_pixel = new_pixel;
}
}
}
// pub fn isometric_coord_mapping(x: i32, y: i32, z: i32) -> (u32, u32) {
// // const BASE_X: i32 = 1016;
// const BASE_X: i32 = (SEG_SIZE as i32 * 8) - 8;
// const BASE_Y: i32 = 2040;
// const XDIFF: (i32, i32) = (-8, 4);
// const ZDIFF: (i32, i32) = (8, 4);
// const YDIFF: (i32, i32) = (0, -8);
// let diff = (
// XDIFF.0 * x + YDIFF.0 * y + ZDIFF.0 * z,
// XDIFF.1 * x + YDIFF.1 * y + ZDIFF.1 * z,
// );
// let coords = (BASE_X + diff.0, BASE_Y + diff.1);
// (coords.0 as u32, coords.1 as u32)
// }
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