From 622e28937c48a8a389e981b9099a839d643f7678 Mon Sep 17 00:00:00 2001
From: Micha White <botahamec@outlook.com>
Date: Sat, 19 Nov 2022 13:33:26 -0500
Subject: Added a load_from_file method

---
 alligator_resources/src/texture.rs | 60 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

(limited to 'alligator_resources/src')

diff --git a/alligator_resources/src/texture.rs b/alligator_resources/src/texture.rs
index 1bb7cb8..ac9e70f 100644
--- a/alligator_resources/src/texture.rs
+++ b/alligator_resources/src/texture.rs
@@ -176,6 +176,19 @@ impl Texture {
 			TextureBuffer::Disk(file) => file.load(),
 		}
 	}
+
+	fn unload(&mut self) {
+		if let TextureBuffer::Disk(file) = &mut self.buffer {
+			file.unload();
+		}
+	}
+
+	fn allocated_size(&self) -> usize {
+		match &self.buffer {
+			TextureBuffer::Memory(texture) => texture_size(texture),
+			TextureBuffer::Disk(file) => file.allocated_size(),
+		}
+	}
 }
 
 pub struct TextureRef<'a> {
@@ -277,6 +290,28 @@ impl TextureManager {
 		}
 	}
 
+	fn can_load(&mut self, texture: &Texture) -> bool {
+		let mut textures: Vec<&mut Texture> = self.textures.values_mut().collect();
+		textures.sort_by_key(|a| a.priority());
+		textures.reverse();
+
+		let max_size = self.max_size;
+		let priority = texture.priority();
+		let mut total_size = texture.allocated_size();
+
+		for texture in textures {
+			if total_size + texture.allocated_size() < max_size {
+				total_size += texture.allocated_size();
+			} else if texture.priority() < priority {
+				texture.unload();
+			} else {
+				return false;
+			}
+		}
+
+		true
+	}
+
 	/// Loads a texture from memory in the given format.
 	///
 	/// # Errors
@@ -300,6 +335,31 @@ impl TextureManager {
 		Ok(id)
 	}
 
+	pub fn load_from_file(
+		&mut self,
+		path: impl AsRef<Path>,
+		priority: Priority,
+	) -> Result<TextureId, LoadError> {
+		let id = TextureId::new();
+		let mut texture = Texture::from_path(path, priority);
+
+		if priority == Priority::Urgent || self.can_load(&texture) {
+			match texture.load_texture() {
+				Ok(_) => {
+					self.textures.insert(id, texture);
+				}
+				Err(e) => {
+					self.textures.insert(id, texture);
+					return Err(e);
+				}
+			}
+		} else {
+			self.textures.insert(id, texture);
+		}
+
+		Ok(id)
+	}
+
 	pub fn atlas(&mut self) -> &Rgba16Texture {
 		let atlas = {
 			profiling::scope!("export atlas");
-- 
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