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use std::{
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slice::from_raw_parts_mut,
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io,
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io::BufReader,
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fs::{File, read_dir},
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path::Path
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};
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use png::{
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ColorType,
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Decoder,
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DecodingError
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};
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use integral_geometry::Size;
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use vec2d::Vec2D;
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pub struct ThemeSprite {
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pixels: Vec2D<u32>
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}
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impl ThemeSprite {
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#[inline]
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pub fn width(&self) -> usize {
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self.pixels.size().width
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}
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#[inline]
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pub fn height(&self) -> usize {
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self.pixels.size().height
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}
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#[inline]
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pub fn bounds(&self) -> Size {
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self.pixels.size()
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}
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#[inline]
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pub fn rows(&self) -> impl Iterator<Item = &[u32]> {
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self.pixels.rows()
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}
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#[inline]
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pub fn get_row(&self, index: usize) -> &[u32] {
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&self.pixels[index]
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}
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}
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pub struct Theme {
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land_texture: Option<ThemeSprite>
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}
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impl Theme {
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pub fn land_texture(&self) -> Option<&ThemeSprite> {
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self.land_texture.as_ref()
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}
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}
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pub enum ThemeLoadError {
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File(io::Error),
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Decoding(DecodingError),
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Format(String)
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}
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impl From<io::Error> for ThemeLoadError {
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fn from(e: io::Error) -> Self {
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ThemeLoadError::File(e)
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}
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}
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impl From<DecodingError> for ThemeLoadError {
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fn from(e: DecodingError) -> Self {
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ThemeLoadError::Decoding(e)
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}
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}
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impl Theme {
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pub fn new() -> Self {
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Theme {
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land_texture: None
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}
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}
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pub fn load(path: &Path) -> Result<Theme, ThemeLoadError> {
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let mut theme = Self::new();
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for entry in read_dir(path)? {
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let file = entry?;
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if file.file_name() == "LandTex.png" {
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let buffer = BufReader::new(File::create(file.path())?);
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let decoder = Decoder::new(buffer);
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let (info, mut reader) = decoder.read_info()?;
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if info.color_type != ColorType::RGBA {
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return Err(ThemeLoadError::Format(
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format!("Unexpected format: {:?}", info.color_type)));
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}
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let size = Size::new(info.width as usize, info.height as usize);
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let mut buffer: Vec2D<u32> = Vec2D::new(size, 0);
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let slice_u32 = buffer.as_mut_slice();
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let slice_u8 = unsafe {
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from_raw_parts_mut::<u8>(
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slice_u32.as_mut_ptr() as *mut u8,
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slice_u32.len() / 4
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)
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};
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reader.next_frame(slice_u8)?;
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let land_tex = ThemeSprite {
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pixels: buffer
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};
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theme.land_texture = Some(land_tex)
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}
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}
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Ok(theme)
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}
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}
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