rust/mapgen/src/theme.rs
author Wuzzy <Wuzzy2@mail.ru>
Wed, 17 Jul 2019 23:52:01 +0200
changeset 15252 647157250713
parent 15125 febccab419b1
permissions -rw-r--r--
Fix broken styling of window size widgets
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
15125
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use png::{ColorType, Decoder, DecodingError};
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use std::{
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    fs::{read_dir, File},
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    io,
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    io::BufReader,
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    path::Path,
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    slice::{from_raw_parts, from_raw_parts_mut},
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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 size(&self) -> Size {
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        self.pixels.size()
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    }
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    #[inline]
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    pub fn width(&self) -> usize {
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        self.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.size().height
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    }
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    #[inline]
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    pub fn rows(&self) -> impl DoubleEndedIterator<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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    #[inline]
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    pub fn get_pixel(&self, x: usize, y: usize) -> u32 {
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        self.pixels[y][x]
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    }
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    pub fn to_transposed(&self) -> ThemeSprite {
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        let size = self.size().transpose();
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        let mut pixels = Vec2D::new(size, 0u32);
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        for (y, row) in self.pixels.rows().enumerate() {
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            for (x, v) in row.iter().enumerate() {
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                pixels[x][y] = *v;
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            }
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        }
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        ThemeSprite { pixels }
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    }
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    pub fn to_tiled(&self) -> TiledSprite {
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        let size = self.size();
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        assert!(size.is_power_of_two());
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        let tile_width_shift = size.width.trailing_zeros() as usize + 2;
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        let mut pixels = vec![0u32; size.area()];
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        for (y, row) in self.pixels.rows().enumerate() {
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            for (x, v) in row.iter().enumerate() {
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                pixels[get_tiled_index(x, y, tile_width_shift)] = *v;
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            }
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        }
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        TiledSprite {
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            tile_width_shift,
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            size,
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            pixels,
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        }
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    }
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}
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#[inline]
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fn get_tiled_index(x: usize, y: usize, tile_width_shift: usize) -> usize {
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    (((y >> 2) << tile_width_shift) + ((x >> 2) << 4)) + ((y & 0b11) << 2) + (x & 0b11)
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}
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pub struct TiledSprite {
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    tile_width_shift: usize,
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    size: Size,
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    pixels: Vec<u32>,
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}
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impl TiledSprite {
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    #[inline]
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    pub fn size(&self) -> Size {
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        self.size
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    }
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    #[inline]
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    pub fn width(&self) -> usize {
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        self.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.size().height
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    }
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    #[inline]
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    pub fn get_pixel(&self, x: usize, y: usize) -> u32 {
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        self.pixels[get_tiled_index(x, y, self.tile_width_shift)]
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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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    border_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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    pub fn border_texture(&self) -> Option<&ThemeSprite> {
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        self.border_texture.as_ref()
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    }
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}
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#[derive(Debug)]
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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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            border_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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                theme.land_texture = Some(load_sprite(&file.path())?)
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            } else if file.file_name() == "Border.png" {
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                theme.border_texture = Some(load_sprite(&file.path())?)
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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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fn load_sprite(path: &Path) -> Result<ThemeSprite, ThemeLoadError> {
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    let decoder = Decoder::new(BufReader::new(File::open(path)?));
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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(format!(
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            "Unexpected format: {:?}",
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            info.color_type
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        )));
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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 pixels: Vec2D<u32> = Vec2D::new(size, 0);
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    reader.next_frame(slice_u32_to_u8_mut(pixels.as_mut_slice()))?;
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    Ok(ThemeSprite { pixels })
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}
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pub fn slice_u32_to_u8(slice_u32: &[u32]) -> &[u8] {
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    unsafe { from_raw_parts::<u8>(slice_u32.as_ptr() as *const u8, slice_u32.len() * 4) }
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}
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pub fn slice_u32_to_u8_mut(slice_u32: &mut [u32]) -> &mut [u8] {
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    unsafe { from_raw_parts_mut::<u8>(slice_u32.as_mut_ptr() as *mut u8, slice_u32.len() * 4) }
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}