From db02dfcfded44e98c42296cef215bca6739a93b0 Mon Sep 17 00:00:00 2001
From: Ellpeck <me@ellpeck.de>
Date: Mon, 14 Nov 2022 11:49:47 +0100
Subject: [PATCH] Store a RuntimeTexturePacker packed texture region's source
 region

---
 CHANGELOG.md                      | 1 +
 MLEM.Data/RuntimeTexturePacker.cs | 3 ++-
 MLEM/Textures/TextureRegion.cs    | 9 ++++++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e510177..d81b58f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -76,6 +76,7 @@ Improvements
 - Made RuntimeTexturePacker restore texture region name and pivot when packing
 - Multi-target net452, making MLEM compatible with MonoGame for consoles
 - Added trimming and AOT annotations and made MLEM.Data trimmable
+- Store a RuntimeTexturePacker packed texture region's source region
 
 Fixes
 - Fixed data texture atlases not allowing most characters in their region names
diff --git a/MLEM.Data/RuntimeTexturePacker.cs b/MLEM.Data/RuntimeTexturePacker.cs
index 4745839..97d6dec 100644
--- a/MLEM.Data/RuntimeTexturePacker.cs
+++ b/MLEM.Data/RuntimeTexturePacker.cs
@@ -203,7 +203,8 @@ namespace MLEM.Data {
                 var packedArea = request.PackedArea.Shrink(new Point(request.Padding, request.Padding));
                 request.Result.Invoke(new TextureRegion(this.PackedTexture, packedArea) {
                     Pivot = request.Texture.Pivot,
-                    Name = request.Texture.Name
+                    Name = request.Texture.Name,
+                    Source = request.Texture
                 });
                 if (this.disposeTextures)
                     request.Texture.Texture.Dispose();
diff --git a/MLEM/Textures/TextureRegion.cs b/MLEM/Textures/TextureRegion.cs
index dc117bb..8fdc743 100644
--- a/MLEM/Textures/TextureRegion.cs
+++ b/MLEM/Textures/TextureRegion.cs
@@ -58,6 +58,11 @@ namespace MLEM.Textures {
         /// The name of this texture region. By default, this name is <see cref="string.Empty"/>.
         /// </summary>
         public string Name = string.Empty;
+        /// <summary>
+        /// A <see cref="TextureRegion"/> that this texture region was created from.
+        /// This value is set in the various constructors that accept another <see cref="TextureRegion"/> to create sub-regions from, as well as by MLEM.Data's <c>RuntimeTexturePacker</c>.
+        /// </summary>
+        public TextureRegion Source;
 
         /// <summary>
         /// Creates a new texture region from a texture and a rectangle which defines the region's area
@@ -116,7 +121,9 @@ namespace MLEM.Textures {
         /// <param name="region">The texture region to create a sub-region of</param>
         /// <param name="uv">The top left corner of this area</param>
         /// <param name="size">The size of this area</param>
-        public TextureRegion(TextureRegion region, Point uv, Point size) : this(region.Texture, region.Position + uv, size) {}
+        public TextureRegion(TextureRegion region, Point uv, Point size) : this(region.Texture, region.Position + uv, size) {
+            this.Source = region;
+        }
 
         /// <summary>
         /// Returns a new <see cref="TextureRegion"/> that has the same <see cref="Texture"/>, <see cref="Pivot"/> and <see cref="Size"/> as this texture, but the returned region's <see cref="Position"/> will be offset by <paramref name="offset"/>.