89 lines
2.5 KiB
Rust
89 lines
2.5 KiB
Rust
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/// Outputs render info in a format suitable for e.g. OpenGL.
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use crate::{
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font::Font,
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types::{Color, PaintCmd},
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};
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#[derive(Clone, Copy, Debug, Default)]
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pub struct Vertex {
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/// Pixel coordinated
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pub x: f32,
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/// Pixel coordinated
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pub y: f32,
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/// Texel indices into the texture
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pub u: u16,
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/// Texel indices into the texture
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pub v: u16,
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/// sRGBA
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pub color: Color,
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}
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#[derive(Clone, Debug, Default)]
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pub struct Frame {
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pub clear_color: Option<Color>,
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/// One big triangle strip
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pub indices: Vec<u32>,
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pub vertices: Vec<Vertex>,
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}
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#[derive(Clone)]
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pub struct Painter {
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font: Font,
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}
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impl Painter {
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pub fn new() -> Painter {
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Painter {
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font: Font::new(13),
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}
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}
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/// 8-bit row-major font atlas texture, (width, height, pixels).
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pub fn texture(&self) -> (usize, usize, &[u8]) {
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self.font.texture()
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}
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pub fn paint(&self, commands: &[PaintCmd]) -> Frame {
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let mut frame = Frame::default();
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for cmd in commands {
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match cmd {
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PaintCmd::Circle { .. } => {} // TODO
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PaintCmd::Clear { fill_color } => {
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frame.clear_color = Some(*fill_color);
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}
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PaintCmd::Line { .. } => {} // TODO
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PaintCmd::Rect {
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pos,
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size,
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fill_color,
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..
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} => {
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// TODO: rounded corners, colors etc.
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let idx = frame.vertices.len() as u32;
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frame.indices.push(idx + 0);
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frame.indices.push(idx + 0);
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frame.indices.push(idx + 1);
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frame.indices.push(idx + 2);
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frame.indices.push(idx + 3);
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frame.indices.push(idx + 3);
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let vert = |x, y| Vertex {
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x,
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y,
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u: 0,
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v: 0,
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color: fill_color.unwrap_or(Color::WHITE),
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};
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frame.vertices.push(vert(pos.x, pos.y));
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frame.vertices.push(vert(pos.x + size.x, pos.y));
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frame.vertices.push(vert(pos.x, pos.y + size.y));
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frame.vertices.push(vert(pos.x + size.x, pos.y + size.y));
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}
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PaintCmd::Text { .. } => {} // TODO
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}
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}
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frame
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}
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}
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