From 810406fb940b40d2f0999dee8a1a3e5467b86dbd Mon Sep 17 00:00:00 2001
From: Ellpeck <me@ellpeck.de>
Date: Sat, 19 Nov 2022 17:12:57 +0100
Subject: [PATCH] Added the ability for UniformTextureAtlases to have padding
 for each region

---
 CHANGELOG.md                         |  1 +
 MLEM/Textures/UniformTextureAtlas.cs | 18 ++++++++++++++----
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d3c972..5f41d43 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ Additions
 - Added TokenizedString.Realign
 - Added GetFlags and GetUniqueFlags to EnumHelper
 - Added GetDownTime, GetUpTime, GetTimeSincePress, WasModifierDown and WasDown to Keybind and Combination
+- Added the ability for UniformTextureAtlases to have padding for each region
 - **Added the ability to find paths to one of multiple goals using AStar**
 
 Improvements
diff --git a/MLEM/Textures/UniformTextureAtlas.cs b/MLEM/Textures/UniformTextureAtlas.cs
index 9162033..a67867f 100644
--- a/MLEM/Textures/UniformTextureAtlas.cs
+++ b/MLEM/Textures/UniformTextureAtlas.cs
@@ -32,6 +32,12 @@ namespace MLEM.Textures {
         /// The height of reach region, based on the texture's height and the amount of regions
         /// </summary>
         public readonly int RegionHeight;
+        /// <summary>
+        /// The padding that each texture region has around itself, in pixels, which will be taken away from each side of <see cref="TextureRegion"/> objects created and returned by this texture atlas.
+        /// Creating a texture atlas with padding can be useful if texture bleeding issues occur due to texture coordinate rounding.
+        /// </summary>
+        public readonly int RegionPadding;
+
         /// <summary>
         /// The texture to use for this atlas.
         /// Note that <see cref="Region"/> stores the actual area that we depend on.
@@ -68,10 +74,12 @@ namespace MLEM.Textures {
         /// <param name="region">The texture region to use for this atlas</param>
         /// <param name="regionAmountX">The amount of texture regions in the x direction</param>
         /// <param name="regionAmountY">The amount of texture regions in the y direction</param>
-        public UniformTextureAtlas(TextureRegion region, int regionAmountX, int regionAmountY) {
+        /// <param name="regionPadding">The padding that each texture region has around itself, in pixels, which will be taken away from each side of <see cref="TextureRegion"/> objects created and returned by this texture atlas.</param>
+        public UniformTextureAtlas(TextureRegion region, int regionAmountX, int regionAmountY, int regionPadding = 0) {
             this.Region = region;
             this.RegionAmountX = regionAmountX;
             this.RegionAmountY = regionAmountY;
+            this.RegionPadding = regionPadding;
             this.RegionWidth = region.Width / regionAmountX;
             this.RegionHeight = region.Height / regionAmountY;
         }
@@ -82,14 +90,16 @@ namespace MLEM.Textures {
         /// <param name="texture">The texture to use for this atlas</param>
         /// <param name="regionAmountX">The amount of texture regions in the x direction</param>
         /// <param name="regionAmountY">The amount of texture regions in the y direction</param>
-        public UniformTextureAtlas(Texture2D texture, int regionAmountX, int regionAmountY) : this(new TextureRegion(texture), regionAmountX, regionAmountY) {}
+        /// <param name="regionPadding">The padding that each texture region has around itself, in pixels, which will be taken away from each side of <see cref="TextureRegion"/> objects created and returned by this texture atlas.</param>
+        public UniformTextureAtlas(Texture2D texture, int regionAmountX, int regionAmountY, int regionPadding = 0) :
+            this(new TextureRegion(texture), regionAmountX, regionAmountY, regionPadding) {}
 
         private TextureRegion GetOrAddRegion(Rectangle rect) {
             if (this.regions.TryGetValue(rect, out var region))
                 return region;
             region = new TextureRegion(this.Region,
-                rect.X * this.RegionWidth, rect.Y * this.RegionHeight,
-                rect.Width * this.RegionWidth, rect.Height * this.RegionHeight);
+                rect.X * this.RegionWidth + this.RegionPadding, rect.Y * this.RegionHeight + this.RegionPadding,
+                rect.Width * this.RegionWidth - 2 * this.RegionPadding, rect.Height * this.RegionHeight - 2 * this.RegionPadding);
             this.regions.Add(rect, region);
             return region;
         }