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use { Buffer2d, ResizeBuffer, Rect, }; pub trait Packer { type Buffer: Buffer2d; fn new(b: Self::Buffer) -> Self; fn pack<O: Buffer2d<Pixel=<Self::Buffer as Buffer2d>::Pixel>>(&mut self, buf: &O) -> Option<Rect>; fn set_margin(&mut self, _val: u32) {} fn buf(&self) -> &Self::Buffer; fn buf_mut(&mut self) -> &mut Self::Buffer; fn into_buf(self) -> Self::Buffer; fn dimensions(&self) -> (u32, u32); fn set_dimensions(&mut self, w: u32, h: u32); } pub trait GrowingPacker: Packer { fn pack_resize<F, O>(&mut self, buf: &O, resize_fn: F) -> Rect where O: Buffer2d<Pixel=<<Self as Packer>::Buffer as Buffer2d>:: Pixel>, F: Fn((u32, u32)) -> (u32, u32); } impl <A, P: Packer<Buffer = A>> GrowingPacker for P where A: ResizeBuffer { fn pack_resize<F, O>(&mut self, buf: &O, resize_fn: F) -> Rect where O: Buffer2d<Pixel=<<Self as Packer>::Buffer as Buffer2d>:: Pixel>, F: Fn((u32, u32)) -> (u32, u32) { match self.pack(buf) { Some(p) => p, None => { let (w, h) = self.dimensions(); let (nw, nh) = resize_fn((w, h)); if nw <= w || nh <= h { panic!("Resize function must make the buffer larger"); } self.buf_mut().resize(nw, nh); self.set_dimensions(nw, nh); self.pack_resize(buf, resize_fn) } } } }