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55 lines
1.9 KiB
55 lines
1.9 KiB
mod skyline;
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use ::texture::{Buffer2d, ResizeableBuffer2d};
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use ::geometry::Rect;
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pub use self::skyline::SkylinePacker;
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pub trait Packer {
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type Buffer: Buffer2d;
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fn new(b: Self::Buffer) -> Self;
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fn pack<O>(&mut self, buf: &O) -> Option<Rect<usize>>
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where O: Buffer2d<Pixel=<Self::Buffer as Buffer2d>::Pixel>; // buffer with same pixel type as this atlas
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fn set_margin(&mut self, margin: usize);
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fn buf(&self) -> &Self::Buffer;
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fn buf_mut(&mut self) -> &mut Self::Buffer;
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fn into_buf(self) -> Self::Buffer; // TODO: consider actually implementing Into?
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fn dimensions(&self) -> (usize, usize);
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fn set_dimensions(&mut self, w: usize, h: usize);
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}
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pub trait GrowingPacker: Packer {
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/// `resize_fn` should describe a strategy for growing the atlas buffer based on the current size.
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fn pack_resize<F, O>(&mut self, buf: &O, resize_fn: F) -> Rect<usize>
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where O: Buffer2d<Pixel=<<Self as Packer>::Buffer as Buffer2d>::Pixel>,
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F: Fn((usize, usize)) -> (usize, usize);
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}
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impl <A, P> GrowingPacker for P
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where A: ResizeableBuffer2d, P: Packer<Buffer = A>
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{
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fn pack_resize<F, O>(&mut self, buf: &O, resize_fn: F) -> Rect<usize>
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where O: Buffer2d<Pixel=<<Self as Packer>::Buffer as Buffer2d>::Pixel>,
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F: Fn((usize, usize)) -> (usize, usize)
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{
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match self.pack(buf) {
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Some(p) => p,
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None => {
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let (w, h) = self.dimensions();
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let (w_, h_) = resize_fn((w, h));
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if w_ <= w || h_ <= h {
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panic!("Resize functions must make the buffer larger!");
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}
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self.buf_mut().resize(w_, h_);
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self.set_dimensions(w_, h_);
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// recurse, trying this new size
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self.pack_resize(buf, resize_fn)
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}
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}
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}
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}
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