SlateRHIFontTexture.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Fonts/FontTypes.h"
#include "Textures/SlateShaderResource.h"
#include "TextureResource.h"
 
class FSlateFontTextureRHIResource : public TSlateTexture<FTextureRHIRef>, public FTextureResource
{
public:
    FSlateFontTextureRHIResource(uint32 InWidth, uint32 InHeight, ESlateFontAtlasContentType InContentType);
 
    virtual uint32 GetWidth() const override { return Width; }
    virtual uint32 GetHeight() const override { return Height; }
 
    virtual uint32 GetSizeX() const override { return Width; }
    virtual uint32 GetSizeY() const override { return Height; }
    virtual FString GetFriendlyName() const override { return TEXT("FSlateFontTextureRHIResource"); }
 
    virtual void InitRHI(FRHICommandListBase& RHICmdList) override;
    virtual void ReleaseRHI() override;
    
    ESlateFontAtlasContentType GetContentType() const { return ContentType; }
 
private:
    EPixelFormat GetRHIPixelFormat() const;
 
    uint32 Width;
    uint32 Height;
    ESlateFontAtlasContentType ContentType;
    TArray<uint8> TempData;
};
 
class FSlateFontAtlasRHI : public FSlateFontAtlas
{
public:
    FSlateFontAtlasRHI(uint32 Width, uint32 Height, ESlateFontAtlasContentType InContentType, ESlateTextureAtlasPaddingStyle InPaddingStyle);
    ~FSlateFontAtlasRHI();
 
    virtual class FSlateShaderResource* GetSlateTexture() const override { return FontTexture.Get(); }
    virtual class FTextureResource* GetEngineTexture() override { return FontTexture.Get(); }
    virtual void ConditionalUpdateTexture()  override;
    virtual void ReleaseResources() override;
private:
    TUniquePtr<FSlateFontTextureRHIResource> FontTexture;
};
 
class FSlateFontTextureRHI : public ISlateFontTexture
{
public:
    FSlateFontTextureRHI(const uint32 InWidth, const uint32 InHeight, ESlateFontAtlasContentType InContentType, const TArray<uint8>& InRawData);
    ~FSlateFontTextureRHI();
 
    virtual class FSlateShaderResource* GetSlateTexture() const override { return FontTexture.Get(); }
    virtual class FTextureResource* GetEngineTexture() override { return FontTexture.Get(); }
    virtual ESlateFontAtlasContentType GetContentType() const override { return FontTexture->GetContentType(); }
    virtual void ReleaseRenderingResources() override
    {
        ReleaseResources();
    }
    virtual void GetAtlasDataCopy(TArray<uint8>& OutData) const override;
 
    void ReleaseResources();
private:
    void UpdateTextureFromSource(const uint32 SourceWidth, const uint32 SourceHeight, const TArray<uint8>& SourceData);
private:
    struct FPendingSourceData
    {
        FPendingSourceData(uint32 InSourceWidth, uint32 InSourceHeight, TArray<uint8> InSourceData)
            : SourceWidth(InSourceWidth)
            , SourceHeight(InSourceHeight)
            , SourceData(MoveTemp(InSourceData))
        {
        }
 
        uint32 SourceWidth;
        uint32 SourceHeight;
        TArray<uint8> SourceData;
    };
 
    TUniquePtr<FPendingSourceData> PendingSourceData;
 
    TUniquePtr<FSlateFontTextureRHIResource> FontTexture;
};