UMGExtensionLibrary.cpp

// Copyright 2016 People Gotta Play. All rights reserved.

#include "ProjectMK.h"
#include "UMGExtensionLibrary.h"

UTextureRenderTarget2D * UUMGExtensionLibrary::RenderWidgetToTexture(bool UseGamma, TextureFilter Filter, UUserWidget * WidgetToRender, FVector2D DrawSize, float DeltaTime)
{
	if (!WidgetToRender) return nullptr;
	if (DrawSize == FVector2D(0, 0)) return nullptr;

	FWidgetRenderer *r = new FWidgetRenderer(UseGamma);
	UTextureRenderTarget2D *rt = r->CreateTargetFor(DrawSize, Filter, UseGamma);
	TSharedRef<SWidget> ref = WidgetToRender->TakeWidget();
	r->DrawWidget(rt, ref, DrawSize, DeltaTime);

	delete r;

	return rt;

}

UTextureRenderTarget2D * UUMGExtensionLibrary::CreateRenderTarget(bool UseGamma, TextureFilter Filter, FVector2D DrawSize)
{
	return FWidgetRenderer::CreateTargetFor(DrawSize, Filter, UseGamma);
}

void UUMGExtensionLibrary::RenderWidgetToTarget(bool UseGamma, TextureFilter Filter, UUserWidget * WidgetToRender, FVector2D DrawSize, float DeltaTime, UPARAM(ref) UTextureRenderTarget2D * Target)
{
	if (!WidgetToRender) return;
	if (DrawSize == FVector2D(0, 0)) return;
	if (!Target) return;

	FWidgetRenderer * r = new FWidgetRenderer(UseGamma);
	TSharedRef<SWidget> ref = WidgetToRender->TakeWidget();
	r->DrawWidget(Target, ref, DrawSize, DeltaTime);

	delete r;

}

UMGExtensionLibrary.h

// Copyright 2016 People Gotta Play. All rights reserved.

#pragma once

#include "Kismet/BlueprintFunctionLibrary.h"
#include "UMG.h"
#include "SlateBasics.h"
#include "SlateCore.h"
#include "SWidget.h"
#include "WidgetRenderer.h"
#include "UMGExtensionLibrary.generated.h"


/**
 * Don't forget to include UMG, Slate and SlateCore modules in Build.cs
 */
UCLASS()
class PROJECTMK_API UUMGExtensionLibrary : public UBlueprintFunctionLibrary
{
	GENERATED_BODY()

public:
	
		//~~~ Widget Renderer ~~~

	UFUNCTION(Category = "UMG", BlueprintCallable, Meta = (DeterminesOutputType = "UTextureRenderTarget2D"))
	static UTextureRenderTarget2D * CreateRenderTarget(bool UseGamma, TextureFilter Filter, FVector2D DrawSize);

	UFUNCTION(Category = "UMG", BlueprintCallable)
	static void RenderWidgetToTarget(bool UseGamma, TextureFilter Filter, UUserWidget * WidgetToRender, FVector2D DrawSize, float DeltaTime, UPARAM(ref) UTextureRenderTarget2D * Target);

	UFUNCTION(Category = "UMG", BlueprintCallable, Meta = (DeterminesOutputType = "UTextureRenderTarget2D"))
	static UTextureRenderTarget2D* RenderWidgetToTexture(bool UseGamma, TextureFilter Filter, UUserWidget * WidgetToRender, FVector2D DrawSize, float DeltaTime);	
	
};