From 2eaea03dbaa7bbca65cea61fcc5c0b3e7739184f Mon Sep 17 00:00:00 2001
From: gered <gered@blarg.ca>
Date: Sun, 25 Aug 2013 14:28:11 -0400
Subject: [PATCH] add support for loading a texture atlas from a JSON file

---
 .../Blarg.GameFramework.csproj                |  3 ++
 .../Atlas/JsonTextureAtlasDefinition.cs       | 13 +++++
 .../Graphics/Atlas/JsonTextureAtlasTile.cs    | 19 +++++++
 .../Graphics/Atlas/TextureAtlasLoader.cs      | 49 +++++++++++++++++++
 4 files changed, 84 insertions(+)
 create mode 100644 Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasDefinition.cs
 create mode 100644 Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasTile.cs
 create mode 100644 Blarg.GameFramework/Graphics/Atlas/TextureAtlasLoader.cs

diff --git a/Blarg.GameFramework/Blarg.GameFramework.csproj b/Blarg.GameFramework/Blarg.GameFramework.csproj
index d2fce3e..e190414 100644
--- a/Blarg.GameFramework/Blarg.GameFramework.csproj
+++ b/Blarg.GameFramework/Blarg.GameFramework.csproj
@@ -189,6 +189,9 @@
     <Compile Include="Graphics\Atlas\AutoGridTextureAtlas.cs" />
     <Compile Include="Graphics\Atlas\TextureAtlasAnimator.cs" />
     <Compile Include="Graphics\Atlas\TextureAtlasTileAnimation.cs" />
+    <Compile Include="Graphics\Atlas\JsonTextureAtlasDefinition.cs" />
+    <Compile Include="Graphics\Atlas\JsonTextureAtlasTile.cs" />
+    <Compile Include="Graphics\Atlas\TextureAtlasLoader.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
   <ItemGroup>
diff --git a/Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasDefinition.cs b/Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasDefinition.cs
new file mode 100644
index 0000000..ad10d0f
--- /dev/null
+++ b/Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasDefinition.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+
+namespace Blarg.GameFramework.Graphics.Atlas
+{
+	public class JsonTextureAtlasDefinition
+	{
+		public string Texture;
+		public List<JsonTextureAtlasTile> Tiles;
+
+	}
+}
+
diff --git a/Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasTile.cs b/Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasTile.cs
new file mode 100644
index 0000000..a2c435d
--- /dev/null
+++ b/Blarg.GameFramework/Graphics/Atlas/JsonTextureAtlasTile.cs
@@ -0,0 +1,19 @@
+using System;
+
+namespace Blarg.GameFramework.Graphics.Atlas
+{
+	public class JsonTextureAtlasTile
+	{
+		public bool Autogrid;
+		public int X;
+		public int Y;
+		public int Width;
+		public int Height;
+		public int NumTilesX;
+		public int NumTilesY;
+		public int TileWidth;
+		public int TileHeight;
+		public int Border;
+	}
+}
+
diff --git a/Blarg.GameFramework/Graphics/Atlas/TextureAtlasLoader.cs b/Blarg.GameFramework/Graphics/Atlas/TextureAtlasLoader.cs
new file mode 100644
index 0000000..cea896e
--- /dev/null
+++ b/Blarg.GameFramework/Graphics/Atlas/TextureAtlasLoader.cs
@@ -0,0 +1,49 @@
+using System;
+using System.IO;
+using Newtonsoft.Json;
+using Blarg.GameFramework.Content;
+using Blarg.GameFramework.IO;
+
+namespace Blarg.GameFramework.Graphics.Atlas
+{
+	public static class TextureAtlasLoader
+	{
+		public static TextureAtlas Load(Stream file, string texturePath = null)
+		{
+			if (file == null)
+				throw new ArgumentNullException("file");
+
+			var reader = new StreamReader(file);
+
+			var definition = JsonConvert.DeserializeObject<JsonTextureAtlasDefinition>(reader.ReadToEnd());
+
+			if (definition.Texture == null)
+				throw new Exception("No texture file specified.");
+			if (definition.Tiles == null || definition.Tiles.Count == 0)
+				throw new Exception("No tiles defined.");
+
+			var contentManager = Framework.Services.Get<ContentManager>();
+			if (contentManager == null)
+				throw new InvalidOperationException("Cannot find a ContentManager object.");
+
+			string textureFile = definition.Texture;
+			if (!String.IsNullOrEmpty(texturePath))
+				textureFile = texturePath + textureFile;
+
+			var texture = contentManager.Get<Texture>(textureFile);
+			var atlas = new CustomTextureAtlas(texture);
+
+			for (int i = 0; i < definition.Tiles.Count; ++i) {
+				var tile = definition.Tiles[i];
+				// TODO: parameter value error checking
+				if (tile.Autogrid)
+					atlas.AddGrid(tile.X, tile.Y, tile.TileWidth, tile.TileHeight, tile.NumTilesX, tile.NumTilesY, tile.Border);
+				else
+					atlas.Add(tile.X, tile.Y, tile.Width, tile.Height);
+			}
+
+			return atlas;
+		}
+	}
+}
+