PaintGeometry.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Rendering/SlateLayoutTransform.h"
#include "Rendering/SlateRenderTransform.h"
#include "Types/SlateVector2.h"
 
struct FPaintGeometry
{
    FVector2f DrawPosition;
 
    float DrawScale;
 
    UE::Slate::FDeprecateVector2DResult GetLocalSize() const { return UE::Slate::FDeprecateVector2DResult(LocalSize); }
 
    const FSlateRenderTransform& GetAccumulatedRenderTransform() const { return AccumulatedRenderTransform; }
 
    void CommitTransformsIfUsingLegacyConstructor() const 
    { 
        if (!bUsingLegacyConstructor) return;
        
        AccumulatedRenderTransform = FSlateRenderTransform(DrawScale, DrawPosition);
        FSlateLayoutTransform AccumulatedLayoutTransform = FSlateLayoutTransform(DrawScale, DrawPosition);
        LocalSize = TransformVector(Inverse(AccumulatedLayoutTransform), DrawSize);
    }
 
    bool HasRenderTransform() const { return bHasRenderTransform; }
 
private:
    // Mutable to support legacy constructors. Doesn't account for render transforms.
    mutable FVector2f DrawSize;
 
    // Mutable to support legacy constructors.
    mutable FVector2f LocalSize;
 
    // final render transform for drawing. Transforms from local space to window space for the draw element.
    // Mutable to support legacy constructors.
    mutable FSlateRenderTransform AccumulatedRenderTransform;
 
    // Support legacy constructors.
    uint8 bUsingLegacyConstructor : 1;
 
    uint8 bHasRenderTransform : 1;
 
public:
    FPaintGeometry() 
        : DrawPosition(0.0f, 0.0f)
        , DrawScale(1.0f)
        , DrawSize(0.0f, 0.0f)
        , LocalSize(0.0f, 0.0f)
        , AccumulatedRenderTransform()
        , bUsingLegacyConstructor(true)
        , bHasRenderTransform(false)
    {}
 
    FPaintGeometry( const FSlateLayoutTransform& InAccumulatedLayoutTransform, const FSlateRenderTransform& InAccumulatedRenderTransform, const UE::Slate::FDeprecateVector2DParameter& InLocalSize, bool bInHasRenderTransform)
        : DrawPosition(InAccumulatedLayoutTransform.GetTranslation())
        , DrawScale(InAccumulatedLayoutTransform.GetScale())
        , DrawSize(0.0f, 0.0f)
        , LocalSize(InLocalSize)
        , AccumulatedRenderTransform(InAccumulatedRenderTransform)
        , bUsingLegacyConstructor(false)
        , bHasRenderTransform(bInHasRenderTransform)
    { 
    }
 
    // !!! DEPRECATED!!! This is legacy and should be removed!
    FPaintGeometry( UE::Slate::FDeprecateVector2DParameter InDrawPosition, UE::Slate::FDeprecateVector2DParameter InDrawSize, float InDrawScale )
        : DrawPosition(InDrawPosition)
        , DrawScale(InDrawScale)
        , DrawSize(InDrawSize)
        , LocalSize(0.0f, 0.0f)
        , AccumulatedRenderTransform()
        , bUsingLegacyConstructor(true)
        , bHasRenderTransform(false)
    { 
    }
 
    void AppendTransform(const FSlateLayoutTransform& LayoutTransform)
    {
        AccumulatedRenderTransform = ::Concatenate(AccumulatedRenderTransform, LayoutTransform);
        DrawPosition = TransformPoint(LayoutTransform, DrawPosition);
        DrawScale = ::Concatenate(LayoutTransform.GetScale(), DrawScale);
    }
 
    void SetRenderTransform(const FSlateRenderTransform& RenderTransform)
    {
        AccumulatedRenderTransform = RenderTransform;
    }
};
 
 
template<> struct TIsPODType<FPaintGeometry> { enum { Value = true }; };