TextureCompressionToggler.cs

using UnityEditor;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;
using UnityEditor.U2D;
using UnityEngine;
using UnityEngine.U2D;

internal class TextureCompressionToggler : IPreprocessBuildWithReport, IPostprocessBuildWithReport {
	public int callbackOrder => 2;

	public void OnPreprocessBuild(BuildReport report) {
		Debug.Log("on preprocess");
		SetCompression(true);
	}
	
	public void OnPostprocessBuild(BuildReport report) {
		Debug.Log("on postprocess");
		SetCompression(false);
	}

	[MenuItem("Edit/TextureCompressorToggler/Enable Compression For All Atlases")]
	static void EnableCompression() {
		SetCompression(true);
	}
	
	[MenuItem("Edit/TextureCompressorToggler/Disable Compression For All Atlases")]
	static void DisableCompression() {
		SetCompression(false);
	}
	
	static void SetCompression(bool compress) {
		// Find all assets labelled with 'architecture' that are also texture2D
		var guids = AssetDatabase.FindAssets("t:spriteAtlas");
		Debug.Log($"setting compression flags, for {guids.Length} assets");
		foreach (var guid in guids) {
			var path     = AssetDatabase.GUIDToAssetPath(guid);
			var atlas = AssetDatabase.LoadAssetAtPath<SpriteAtlas>(path);
			SetCompression(atlas, compress);
		}
	}

	static void SetCompression(SpriteAtlas atlas, bool compress) {
		if (compress) {
			atlas.SetPlatformSettings(new TextureImporterPlatformSettings {
				textureCompression = TextureImporterCompression.Compressed,
			});		
		} else {
			atlas.SetPlatformSettings( new TextureImporterPlatformSettings {
				textureCompression = TextureImporterCompression.Uncompressed,
			});	
		}
	}

}