// Copyright Epic Games, Inc. All Rights Reserved.

#include "ThumbnailRendering/SubsurfaceProfileRenderer.h"
#include "CanvasItem.h"
#include "Engine/Engine.h"
#include "EngineGlobals.h"
#include "Engine/SubsurfaceProfile.h"
#include "CanvasTypes.h"

USubsurfaceProfileRenderer::USubsurfaceProfileRenderer(const FObjectInitializer& ObjectInitializer)
    : Super(ObjectInitializer)
{
}

void USubsurfaceProfileRenderer::GetThumbnailSize(UObject* Object, float Zoom, uint32& OutWidth, uint32& OutHeight) const
{
    OutWidth  = 128;
    OutHeight = 128;
}

void USubsurfaceProfileRenderer::Draw(UObject* Object, int32 X, int32 Y, uint32 Width, uint32 Height, FRenderTarget*, FCanvas* Canvas, bool bAdditionalViewFamily)
{
    USubsurfaceProfile* LocalSubsurfaceProfile = Cast<USubsurfaceProfile>(Object);
    if (LocalSubsurfaceProfile)
    {
        FLinearColor Col;

        Col   = LocalSubsurfaceProfile->Settings.SubsurfaceColor;
        Col.A = 1;
        Canvas->DrawTile(0, 0, Width, Height / 2, 0, 0, 1, 1, Col);
        Col   = LocalSubsurfaceProfile->Settings.FalloffColor;
        Col.A = 1;
        Canvas->DrawTile(0, Height / 2, Width, Height / 2, 0, 0, 1, 1, Col);

        FText ScatterRadiusText = FText::AsNumber(LocalSubsurfaceProfile->Settings.ScatterRadius);
        FCanvasTextItem TextItem(FVector2D(5.0f, 5.0f), ScatterRadiusText, GEngine->GetLargeFont(), FLinearColor::White);
        TextItem.EnableShadow(FLinearColor::Black);
        TextItem.Scale = FVector2D(Width / 128.0f, Height / 128.0f);
        TextItem.Draw(Canvas);
    }
}