81 lines
2 KiB
Rust
81 lines
2 KiB
Rust
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/// A texture pixels, used for fonts.
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#[derive(Clone, Default)]
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pub struct TextureAtlas {
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width: usize,
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height: usize,
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pixels: Vec<u8>,
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/// Used for when adding new rects
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cursor: (usize, usize),
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row_height: usize,
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}
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impl TextureAtlas {
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pub fn new(width: usize, height: usize) -> Self {
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TextureAtlas {
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width: width,
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height: height,
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pixels: vec![0; width * height],
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..Default::default()
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}
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}
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pub fn width(&self) -> usize {
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self.width
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}
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pub fn height(&self) -> usize {
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self.height
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}
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pub fn pixels(&self) -> &[u8] {
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&self.pixels
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}
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pub fn texture(&self) -> (u16, u16, &[u8]) {
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(self.width() as u16, self.height() as u16, self.pixels())
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}
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/// Returns the coordinates of where the rect ended up.
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pub fn allocate(&mut self, (w, h): (usize, usize)) -> (usize, usize) {
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assert!(w <= self.width);
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if self.cursor.0 + w > self.width {
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// New row:
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self.cursor.0 = 0;
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self.cursor.1 += self.row_height;
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self.row_height = 0;
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}
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self.row_height = self.row_height.max(h);
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while self.cursor.1 + self.row_height >= self.height {
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self.height *= 2;
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}
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if self.width * self.height > self.pixels.len() {
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self.pixels.resize(self.width * self.height, 0);
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}
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let pos = self.cursor;
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self.cursor.0 += w;
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(pos.0 as usize, pos.1 as usize)
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}
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}
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impl std::ops::Index<(usize, usize)> for TextureAtlas {
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type Output = u8;
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fn index(&self, (x, y): (usize, usize)) -> &u8 {
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assert!(x < self.width);
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assert!(y < self.height);
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&self.pixels[y * self.width + x]
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}
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}
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impl std::ops::IndexMut<(usize, usize)> for TextureAtlas {
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fn index_mut(&mut self, (x, y): (usize, usize)) -> &mut u8 {
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assert!(x < self.width);
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assert!(y < self.height);
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&mut self.pixels[y * self.width + x]
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}
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}
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