From dce6499a0c31f5e4e35816284b04cda7b5deb62c Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Mon, 25 May 2020 22:01:41 +0200
Subject: [PATCH] added TextureExtensions

---
 MLEM/Extensions/TextureExtensions.cs | 98 ++++++++++++++++++++++++++++
 Sandbox/GameImpl.cs                  |  9 ++-
 2 files changed, 105 insertions(+), 2 deletions(-)
 create mode 100644 MLEM/Extensions/TextureExtensions.cs

diff --git a/MLEM/Extensions/TextureExtensions.cs b/MLEM/Extensions/TextureExtensions.cs
new file mode 100644
index 0000000..127774b
--- /dev/null
+++ b/MLEM/Extensions/TextureExtensions.cs
@@ -0,0 +1,98 @@
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace MLEM.Extensions {
+    /// <summary>
+    /// A set of extensions for dealing with <see cref="Texture2D"/>
+    /// </summary>
+    public static class TextureExtensions {
+
+        /// <summary>
+        /// Returns a new instance of <see cref="TextureData"/> which allows easily managing a texture's data with texture coordinates rather than indices.
+        /// </summary>
+        /// <param name="texture">The texture whose data to get</param>
+        /// <returns>The texture's data</returns>
+        public static TextureData GetTextureData(this Texture2D texture) {
+            return new TextureData(texture);
+        }
+
+        /// <summary>
+        /// A struct that represents the data of a texture, accessed through <see cref="TextureExtensions.GetTextureData"/>.
+        /// </summary>
+        public struct TextureData {
+
+            private readonly Texture2D texture;
+            private readonly Color[] data;
+            /// <summary>
+            /// Returns the color at the given x,y position of the texture, where 0,0 represents the bottom left.
+            /// </summary>
+            /// <param name="x">The x coordinate of the texture location</param>
+            /// <param name="y">The y coordinate of the texture location</param>
+            public Color this[int x, int y] {
+                get => this.data[this.ToIndex(x, y)];
+                set => this.data[this.ToIndex(x, y)] = value;
+            }
+            /// <inheritdoc cref="this[int,int]"/>
+            public Color this[Point point] {
+                get => this[point.X, point.Y];
+                set => this[point.X, point.Y] = value;
+            }
+
+            /// <summary>
+            /// Creates a new texture data instance for the given texture.
+            /// Note that this can more easily be invoked using <see cref="TextureExtensions.GetTextureData"/>.
+            /// </summary>
+            /// <param name="texture">The texture whose data to get</param>
+            public TextureData(Texture2D texture) {
+                this.texture = texture;
+                this.data = new Color[texture.Width * texture.Height];
+                this.texture.GetData(this.data);
+            }
+
+            /// <summary>
+            /// Stores this texture data back into the underlying texture
+            /// </summary>
+            public void Store() {
+                this.texture.SetData(this.data);
+            }
+
+            /// <summary>
+            /// Converts the given x,y texture coordinate to the corresponding index in the <see cref="Texture2D.GetData{T}(T[])"/> array.
+            /// </summary>
+            /// <param name="x">The x coordinate</param>
+            /// <param name="y">The y coordinate</param>
+            /// <returns>The corresponding texture array index</returns>
+            /// <exception cref="ArgumentException">If the given coordinate is out of bounds</exception>
+            public int ToIndex(int x, int y) {
+                if (!this.IsInBounds(x, y))
+                    throw new ArgumentException();
+                return y * this.texture.Width + x;
+            }
+
+            /// <summary>
+            /// Converts the given index from the <see cref="Texture2D.GetData{T}(T[])"/> array into the corresponding x,y texture coordinate.
+            /// </summary>
+            /// <param name="index">The texture array index</param>
+            /// <returns>The corresponding texture coordinate</returns>
+            /// <exception cref="ArgumentException">If the given index is out of bounds</exception>
+            public Point FromIndex(int index) {
+                if (index < 0 || index >= this.data.Length)
+                    throw new ArgumentException();
+                return new Point(index % this.texture.Width, index / this.texture.Width);
+            }
+
+            /// <summary>
+            /// Checks if the given x,y texture coordinates is within the bounds of the underlying texture.
+            /// </summary>
+            /// <param name="x">The x coordinate</param>
+            /// <param name="y">The y coordinate</param>
+            /// <returns>Whether the given coordinate is within bounds of the underlying texture</returns>
+            public bool IsInBounds(int x, int y) {
+                return x >= 0 && y >= 0 && x < this.texture.Width && y < this.texture.Height;
+            }
+
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/Sandbox/GameImpl.cs b/Sandbox/GameImpl.cs
index 21844e0..1dc9f6b 100644
--- a/Sandbox/GameImpl.cs
+++ b/Sandbox/GameImpl.cs
@@ -62,6 +62,11 @@ namespace Sandbox {
             };
 
             var tex = this.rawContent.Load<Texture2D>("Textures/Test");
+            var data = tex.GetTextureData();
+            data[1, 9] = Color.Pink;
+            data[data.FromIndex(data.ToIndex(25, 9))] = Color.Yellow;
+            data.Store();
+
             //var font = new GenericSpriteFont(LoadContent<SpriteFont>("Fonts/TestFont"));
             var font = new GenericBitmapFont(LoadContent<BitmapFont>("Fonts/Regular"));
             this.UiSystem.Style = new UntexturedStyle(this.SpriteBatch) {
@@ -126,14 +131,14 @@ namespace Sandbox {
             this.tokenized = formatter.Tokenize(font, strg);
             this.tokenized.Split(font, 400, 5);
 
-            this.OnDraw += (g, time) => {
+            /*this.OnDraw += (g, time) => {
                 this.SpriteBatch.Begin(samplerState: SamplerState.PointClamp);
                 this.SpriteBatch.FillRectangle(new RectangleF(400, 20, 400, 1000), Color.Green);
                 font.DrawString(this.SpriteBatch, this.tokenized.DisplayString, new Vector2(400, 20), Color.White * 0.25F, 0, Vector2.Zero, 5, SpriteEffects.None, 0);
                 this.tokenized.Draw(time, this.SpriteBatch, new Vector2(400, 20), font, Color.White, 5, 0);
                 this.SpriteBatch.DrawGrid(new Vector2(30, 30), new Vector2(40, 60), new Point(10, 5), Color.Yellow, 3);
                 this.SpriteBatch.End();
-            };
+            };*/
             this.OnUpdate += (g, time) => {
                 if (this.InputHandler.IsPressed(Keys.W)) {
                     this.tokenized = formatter.Tokenize(font, strg);