Remove unused legacy code & defines (#3059)

* Remove legacy code & defines
- Removed `FLX_POST_PROCESS` define &  related code
- Removed references to `openfl_next`, `lime_legacy` &  `next` defines
- Removed Lime & OpenFL version checks that are always true/false due to the current minimum versions

* Removed `legacy` define being set in include.xml

* Re-added `#if !flash` check in `initRenderMethod`

I mistakenly removed the entire code due to it including `lime_legacy`.

* Brought back `undump()` & `canBeDumped` as `refreshBitmap()` & `canBeRefreshed` respectively (old ones are now deprecated)
- Also brought back `onAssetsReload()` & `getBitmapFromSystem()`

* Added missing line breaks

* remove old import

* Remove another deprecated define

* Restored mistakenly-removed define check

* Rename `refreshBitmap()` to `refresh()`

---------

Co-authored-by: George FunBook <[email protected]>

Author: Starmapo

checkstyle.json

@@ -5,7 +5,6 @@
 		"FLX_NATIVE_CURSOR",
 		"FLX_SOUND_TRAY",
 		"FLX_POINTER_INPUT",
-		"FLX_POST_PROCESS",
 		"FLX_RECORD"
 	],
 	"defineCombinations": [

flixel/FlxCamera.hx

@@ -1676,9 +1676,7 @@ class FlxCamera extends FlxBasic
 
 			final targetGraphics = (graphics == null) ? canvas.graphics : graphics;
 
-			#if (openfl > "8.7.0")
 			targetGraphics.overrideBlendMode(null);
-			#end
 			targetGraphics.beginFill(Color, FxAlpha);
 			// i'm drawing rect with these parameters to avoid light lines at the top and left of the camera,
 			// which could appear while cameras fading

flixel/FlxG.hx

@@ -1,6 +1,5 @@
 package flixel;
 
-import flixel.effects.postprocess.PostProcess;
 import flixel.math.FlxMath;
 import flixel.math.FlxRandom;
 import flixel.math.FlxRect;
@@ -50,12 +49,6 @@ import flixel.input.FlxAccelerometer;
 #if FLX_POINTER_INPUT
 import flixel.input.FlxSwipe;
 #end
-#if FLX_POST_PROCESS
-import flixel.util.FlxDestroyUtil;
-import openfl.display.OpenGLView;
-
-using flixel.util.FlxArrayUtil;
-#end
 
 #if html5
 import flixel.system.frontEnds.HTML5FrontEnd;
@@ -515,62 +508,6 @@ class FlxG
 		return child;
 	}
 
-	public static function addPostProcess(postProcess:PostProcess):PostProcess
-	{
-		#if FLX_POST_PROCESS
-		if (OpenGLView.isSupported)
-		{
-			var postProcesses = game.postProcesses;
-
-			// chaining
-			var length = postProcesses.length;
-			if (length > 0)
-			{
-				postProcesses[length - 1].to = postProcess;
-			}
-
-			game.postProcessLayer.addChild(postProcess);
-			postProcesses.push(postProcess);
-		}
-		else
-		{
-			FlxG.log.error("Shaders are not supported on this platform.");
-		}
-		#end
-
-		return postProcess;
-	}
-
-	public static function removePostProcess(postProcess:PostProcess):Void
-	{
-		#if FLX_POST_PROCESS
-		var postProcesses = game.postProcesses;
-		if (postProcesses.remove(postProcess))
-		{
-			chainPostProcesses();
-			postProcess.to = null;
-
-			FlxDestroyUtil.removeChild(game.postProcessLayer, postProcess);
-		}
-		#end
-	}
-
-	#if FLX_POST_PROCESS
-	static function chainPostProcesses():Void
-	{
-		var postProcesses = game.postProcesses;
-
-		if (postProcesses.length > 0)
-		{
-			for (i in 0...postProcesses.length - 1)
-			{
-				postProcesses[i].to = postProcesses[i + 1];
-			}
-			postProcesses.last().to = null;
-		}
-	}
-	#end
-
 	/**
 	 * Opens a web page, by default a new tab or window. If the URL does not
 	 * already start with `"http://"` or `"https://"`, it gets added automatically.
@@ -647,31 +584,13 @@ class FlxG
 
 	static function initRenderMethod():Void
 	{
-		renderMethod = BLITTING;
-
-		#if (!lime_legacy && !flash)
-		#if (lime >= "7.0.0")
+		#if !flash
 		renderMethod = switch (stage.window.context.type)
 		{
 			case OPENGL, OPENGLES, WEBGL: DRAW_TILES;
 			default: BLITTING;
 		}
 		#else
-		if (!Lib.application.config.windows[0].hardware)
-		{
-			renderMethod = BLITTING;
-		}
-		else
-		{
-			renderMethod = switch (stage.window.renderer.type)
-			{
-				case OPENGL, CONSOLE: DRAW_TILES;
-				case CANVAS, FLASH, CAIRO: BLITTING;
-				default: BLITTING;
-			}
-		}
-		#end
-		#else
 		#if web
 		renderMethod = BLITTING;
 		#else

flixel/FlxGame.hx

@@ -15,10 +15,6 @@ import openfl.filters.BitmapFilter;
 #if desktop
 import openfl.events.FocusEvent;
 #end
-#if FLX_POST_PROCESS
-import flixel.effects.postprocess.PostProcess;
-import openfl.display.OpenGLView;
-#end
 #if FLX_DEBUG
 import flixel.system.debug.FlxDebugger;
 #end
@@ -149,14 +145,6 @@ class FlxGame extends Sprite
 	 */
 	var _filters:Array<BitmapFilter>;
 
-	#if (desktop && lime_legacy)
-	/**
-	 * Ugly workaround to ensure consistent behaviour between flash and cpp
-	 * (the focus event should not fire when the game starts up!)
-	 */
-	var _onFocusFiredOnce:Bool = false;
-	#end
-
 	#if FLX_FOCUS_LOST_SCREEN
 	/**
 	 * The "focus lost" screen.
@@ -230,18 +218,6 @@ class FlxGame extends Sprite
 	var _recordingRequested:Bool = false;
 	#end
 
-	#if FLX_POST_PROCESS
-	/**
-	 * `Sprite` for postprocessing effects
-	 */
-	var postProcessLayer:Sprite = new Sprite();
-
-	/**
-	 * Post process effects active on the `postProcessLayer`.
-	 */
-	var postProcesses:Array<PostProcess> = [];
-	#end
-
 	/**
 	 * Instantiate a new game object.
 	 *
@@ -330,11 +306,6 @@ class FlxGame extends Sprite
 
 		addChild(_inputContainer);
 
-		#if FLX_POST_PROCESS
-		if (OpenGLView.isSupported)
-			addChild(postProcessLayer);
-		#end
-
 		// Creating the debugger overlay
 		#if FLX_DEBUG
 		debugger = new FlxDebugger(FlxG.stage.stageWidth, FlxG.stage.stageHeight);
@@ -356,10 +327,7 @@ class FlxGame extends Sprite
 		#end
 
 		// Focus gained/lost monitoring
-		#if (desktop && openfl <= "4.0.0")
-		stage.addEventListener(FocusEvent.FOCUS_OUT, onFocusLost);
-		stage.addEventListener(FocusEvent.FOCUS_IN, onFocus);
-		#elseif (sys && openfl >= "9.3.0")
+		#if (sys && openfl >= "9.3.0")
 		stage.nativeWindow.addEventListener(Event.DEACTIVATE, onFocusLost);
 		stage.nativeWindow.addEventListener(Event.ACTIVATE, onFocus);
 		#else
@@ -394,15 +362,6 @@ class FlxGame extends Sprite
 			return; // Don't run this function twice (bug in standalone flash player)
 		#end
 
-		#if (desktop && lime_legacy)
-		// make sure the on focus event doesn't fire on startup
-		if (!_onFocusFiredOnce)
-		{
-			_onFocusFiredOnce = true;
-			return;
-		}
-		#end
-
 		#if mobile
 		// just check if device orientation has been changed
 		onResize(_);
@@ -433,11 +392,6 @@ class FlxGame extends Sprite
 
 	function onFocusLost(event:Event):Void
 	{
-		#if next
-		if (event != null && event.target != FlxG.stage)
-			return;
-		#end
-
 		#if flash
 		if (_lostFocus)
 			return; // Don't run this function twice (bug in standalone flash player)
@@ -472,11 +426,6 @@ class FlxGame extends Sprite
 		var width:Int = FlxG.stage.stageWidth;
 		var height:Int = FlxG.stage.stageHeight;
 
-		#if !flash
-		if (FlxG.renderTile)
-			FlxG.bitmap.onContext();
-		#end
-
 		resizeGame(width, height);
 	}
 
@@ -502,11 +451,6 @@ class FlxGame extends Sprite
 		if (soundTray != null)
 			soundTray.screenCenter();
 		#end
-
-		#if FLX_POST_PROCESS
-		for (postProcess in postProcesses)
-			postProcess.rebuild();
-		#end
 	}
 
 	/**
@@ -741,11 +685,6 @@ class FlxGame extends Sprite
 
 		updateInput();
 
-		#if FLX_POST_PROCESS
-		if (postProcesses[0] != null)
-			postProcesses[0].update(FlxG.elapsed);
-		#end
-
 		#if FLX_SOUND_SYSTEM
 		FlxG.sound.update(FlxG.elapsed);
 		#end
@@ -867,11 +806,6 @@ class FlxGame extends Sprite
 		if (FlxG.renderTile)
 			FlxDrawBaseItem.drawCalls = 0;
 
-		#if FLX_POST_PROCESS
-		if (postProcesses[0] != null)
-			postProcesses[0].capture();
-		#end
-
 		FlxG.cameras.lock();
 
 		if (FlxG.plugins.drawOnTop)