Added margin

crates/packer/src/atlasset.rs

@@ -1,6 +1,6 @@
 use anyhow::{bail, Context, Result};
 use galactica_packer::{SpriteAtlas, SpriteAtlasImage};
-use image::{imageops, ImageBuffer, Rgba, RgbaImage};
+use image::{imageops, GenericImageView, ImageBuffer, Rgba, RgbaImage};
 use std::{
 	fs::File,
 	io::{Read, Write},
@@ -51,6 +51,9 @@ pub struct AtlasSet {
 	/// The root directory that contains all image files.
 	/// Files outside this directory will not be packed.
 	asset_root: PathBuf,
+
+	/// Leave an empty border this many pixels wide around each image
+	image_margin: u32,
 }
 
 impl AtlasSet {
@@ -59,6 +62,7 @@ impl AtlasSet {
 		texture_height: u32,
 		texture_limit: usize,
 		asset_root: &Path,
+		image_margin: u32,
 	) -> Self {
 		Self {
 			asset_root: asset_root.to_path_buf(),
@@ -71,11 +75,12 @@ impl AtlasSet {
 			index: SpriteAtlas::new(),
 			used_area: 0f64,
 			image_y_start: Vec::new(),
+			image_margin,
 		}
 	}
 
 	/// Add a sprite to this atlas set
-	pub fn write_image(&mut self, path: &Path, dim: [u32; 2]) -> Result<usize> {
+	pub fn write_image(&mut self, path: &Path) -> Result<usize> {
 		let mut f = File::open(&path)?;
 		let mut bytes = Vec::new();
 		f.read_to_end(&mut bytes)
@@ -83,6 +88,13 @@ impl AtlasSet {
 		let img = image::load_from_memory(&bytes)
 			.with_context(|| format!("While loading file `{}`", path.display()))?;
 
+		let image_dim = img.dimensions();
+
+		let dim = [
+			image_dim.0 + 2 * self.image_margin,
+			image_dim.1 + 2 * self.image_margin,
+		];
+
 		let mut x = 0;
 		let mut y = 0;
 		let mut final_atlas_idx = None;
@@ -113,8 +125,6 @@ impl AtlasSet {
 				if dim[0] >= sd[0] || dim[1] >= sd[1] {
 					y = sy;
 				}
-			} else {
-				self.image_y_start.push((0, [u32::MAX, u32::MAX]));
 			}
 
 			let mut free = false;
@@ -156,8 +166,12 @@ impl AtlasSet {
 		};
 
 		// We found a spot for this image, write it.
-		//let img = RgbaImage::from_pixel(dim[0], dim[1], Rgba([0, 0, 0, 255]));
-		imageops::overlay(&mut self.texture_list[atlas_idx], &img, x.into(), y.into());
+		imageops::overlay(
+			&mut self.texture_list[atlas_idx],
+			&img,
+			(x + self.image_margin).into(),
+			(y + self.image_margin).into(),
+		);
 		self.used_regions[atlas_idx].push(([x, y], dim));
 		self.used_area += dim[0] as f64 * dim[1] as f64;
 
@@ -182,10 +196,10 @@ impl AtlasSet {
 			p.to_path_buf(),
 			SpriteAtlasImage {
 				atlas: atlas_idx as u32,
-				x: x as f32 / self.texture_width as f32,
-				y: y as f32 / self.texture_height as f32,
-				w: dim[0] as f32 / self.texture_width as f32,
-				h: dim[1] as f32 / self.texture_height as f32,
+				x: (x + self.image_margin) as f32 / self.texture_width as f32,
+				y: (y + self.image_margin) as f32 / self.texture_height as f32,
+				w: image_dim.0 as f32 / self.texture_width as f32,
+				h: image_dim.1 as f32 / self.texture_height as f32,
 			},
 		);
 

crates/packer/src/main.rs

@@ -64,13 +64,13 @@ fn main() -> Result<()> {
 	}
 
 	// Create atlas set
-	let mut atlas_set = AtlasSet::new(8192, 8192, 16, &asset_root);
+	let mut atlas_set = AtlasSet::new(8192, 8192, 16, &asset_root, 2);
 	let total = files.len();
 	let mut i = 0;
 	let mut peak_efficiency = 0f64;
-	for (path, dim) in files {
+	for (path, _) in files {
 		i += 1;
-		let atlas_idx = atlas_set.write_image(&path, dim)?;
+		let atlas_idx = atlas_set.write_image(&path)?;
 		println!(
 			"({i} of {total}, atlas {atlas_idx}, efficiency {:.02}%) Added {}",
 			100.0 * atlas_set.get_efficiency(),