102 lines
2.9 KiB
Rust
102 lines
2.9 KiB
Rust
// Copyright 2016 Matthew Collins
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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pub struct Atlas {
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free_space: Vec<Rect>,
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}
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#[derive(Debug, Clone, Copy)]
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pub struct Rect {
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pub x: usize,
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pub y: usize,
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pub width: usize,
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pub height: usize,
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}
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impl Atlas {
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pub fn new(width: usize, height: usize) -> Atlas {
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let mut a = Atlas {
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free_space: Vec::new(),
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};
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a.free_space.push(Rect {
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x: 0,
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y: 0,
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width,
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height,
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});
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a
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}
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pub fn add(&mut self, width: usize, height: usize) -> Option<Rect> {
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let mut priority = usize::max_value();
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let mut target: Option<Rect> = None;
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let mut target_index = 0;
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// Search through and find the best fit for this texture
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for (index, free) in self.free_space.iter().enumerate() {
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if free.width >= width && free.height >= height {
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let current_priority = (free.width - width) * (free.height - height);
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if target.is_none() || current_priority < priority {
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target = Some(*free);
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priority = current_priority;
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target_index = index;
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}
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// Perfect match, we can break early
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if priority == 0 {
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break;
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}
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}
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}
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if target.is_none() {
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return None;
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}
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let mut t = target.unwrap();
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let ret = Rect {
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x: t.x,
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y: t.y,
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width,
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height,
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};
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if width == t.width {
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t.y += height;
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t.height -= height;
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if t.height == 0 {
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// Remove empty sections
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self.free_space.remove(target_index);
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} else {
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self.free_space[target_index] = t;
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}
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} else {
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if t.height > height {
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// Split by height
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self.free_space.insert(
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0,
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Rect {
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x: t.x,
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y: t.y + height,
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width,
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height: t.height - height,
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},
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);
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target_index += 1;
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}
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t.x += width;
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t.width -= width;
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self.free_space[target_index] = t;
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}
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Some(ret)
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}
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}
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