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|
use serde::Deserialize;
use std::{collections::HashMap, error::Error, fs::File, io::BufReader, path::Path};
fn load_img(path: &Path) -> Result<(Vec<u8>, u32, u32), Box<dyn Error>> {
let mut decoder = png::Decoder::new(BufReader::new(File::open(path)?));
decoder.set_transformations(png::Transformations::IDENTITY);
let mut reader = decoder.read_info()?;
// only None if it's too big for memory
let mut buf = vec![0; reader.output_buffer_size().unwrap()];
let info = reader.next_frame(&mut buf)?;
if info.color_type != png::ColorType::Indexed {
return Err(format!("{:#?}: not indexed", path.to_str()).into());
}
if info.bit_depth != png::BitDepth::Eight {
return Err(format!(
"{:#?}: expected 8-bit, got {:?}",
path.to_str(),
info.bit_depth
)
.into());
}
buf.truncate(info.buffer_size());
Ok((buf, info.width, info.height))
}
#[derive(Deserialize, Debug)]
pub struct TilesetDimensions {
pub short: u32,
pub long: u32,
}
#[derive(Deserialize, Clone, Copy, Debug)]
pub enum TilesetPixelType {
Void = 0,
Terrain,
}
#[derive(Deserialize, Debug)]
struct TilesetManifest {
dimensions: TilesetDimensions,
palette: HashMap<u8, TilesetPixelType>,
}
fn load_manifest(path: &Path) -> Result<TilesetManifest, Box<dyn Error>> {
Ok(toml::from_str(&std::fs::read_to_string(path)?)?)
}
#[derive(Debug)]
pub struct Tile {
pub pixels: Vec<TilesetPixelType>,
}
#[derive(Debug)]
pub struct Tileset {
pub dimensions: TilesetDimensions,
pub vertical_tiles: Vec<Tile>,
pub horizontal_tiles: Vec<Tile>,
}
#[derive(Debug, Clone, Copy)]
pub enum TileOrientation {
Horizontal,
Vertical,
}
fn parse_row(
y: u32,
img: &(Vec<u8>, u32, u32),
manifest: &TilesetManifest,
orientation: TileOrientation,
) -> Result<Vec<Tile>, String> {
let ey = match orientation {
TileOrientation::Horizontal => y + manifest.dimensions.short,
TileOrientation::Vertical => y + manifest.dimensions.long,
};
let mut tiles = Vec::new();
let mut x = 1;
loop {
if x >= img.1 {
break;
}
let left_border = img.0[(x - 1 + y * img.1) as usize];
// 2 = border color
if left_border != 2 {
break;
}
let mut tile_pixels = Vec::new();
let ex = match orientation {
TileOrientation::Horizontal => x + manifest.dimensions.long,
TileOrientation::Vertical => x + manifest.dimensions.short,
};
for py in y..ey {
for px in x..ex {
let idx = img.0[(px + py * img.1) as usize];
let palette = manifest.palette.get(&idx);
match palette {
Some(pixel_type) => tile_pixels.push(*pixel_type),
None => {
return Err(format!(
"Pixel ({px},{py}) resolved to idx {idx} which isn't in the palette"
));
}
}
}
}
debug_assert!(
tile_pixels.len() == (manifest.dimensions.long * manifest.dimensions.short) as usize
);
tiles.push(Tile {
pixels: tile_pixels,
});
x = ex + 3;
}
Ok(tiles)
}
fn parse_tiles(
img: &(Vec<u8>, u32, u32),
manifest: &TilesetManifest,
) -> Result<(Vec<Tile>, Vec<Tile>), String> {
let mut horizontal_tiles = Vec::new();
let mut vertical_tiles = Vec::new();
let mut y = 0;
loop {
if y >= img.2 {
break;
}
let edge = img.0[((y) * img.1) as usize] == 2;
if !edge {
y += 1;
continue;
}
let orientation = if img.0[((y + manifest.dimensions.short + 2) * img.1) as usize] == 0 {
TileOrientation::Horizontal
} else {
TileOrientation::Vertical
};
let parse_result = parse_row(y + 1, img, manifest, orientation);
match parse_result {
Ok(mut tiles) => match orientation {
TileOrientation::Horizontal => {
println!("Parsed horizontal row {y}. {n} entries", n = tiles.len());
horizontal_tiles.append(&mut tiles);
y += manifest.dimensions.short + 3;
}
TileOrientation::Vertical => {
println!("Parsed vertical row {y}. {n} entries", n = tiles.len());
vertical_tiles.append(&mut tiles);
y += manifest.dimensions.long + 3;
}
},
Err(e) => {
return Err(format!(
"Failed to parse row {} ({:#?}): {e}",
y + 1,
orientation
));
}
}
}
Ok((horizontal_tiles, vertical_tiles))
}
pub fn load_tileset(path: &str) -> Tileset {
let img_result = load_img(&Path::join(Path::new(path), Path::new("img.png")));
match img_result {
Ok(img_result) => {
let manifest_result =
load_manifest(&Path::join(Path::new(path), Path::new("manifest.toml")));
match manifest_result {
Ok(manifest) => {
debug_assert!(manifest.dimensions.long == manifest.dimensions.short * 2);
let (horizontal_tiles, vertical_tiles) =
parse_tiles(&img_result, &manifest).unwrap();
Tileset {
dimensions: manifest.dimensions,
vertical_tiles,
horizontal_tiles,
}
}
Err(e) => {
panic!("Couldn't load sprite: {}", e)
}
}
}
Err(e) => {
panic!("Couldn't load sprite: {}", e)
}
}
}
|
