TexturesCacheHandler.h

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// Copyright(c) 2024 grrimgrriefer & DZnnah, see LICENSE for details.
 
#pragma once
 
#include "CoreMinimal.h"
#include "VoxtaDefines.h"
 
class UTexture2DDynamic;
class IImageWrapper;

class TexturesCacheHandler : public TSharedFromThis<TexturesCacheHandler>
{
#pragma region helper classes
private:
    class TextureInfo
    {
    public:
        TextureInfo(TWeakObjectPtr<const UTexture2DDynamic> texture, int width, int height) :
            TEXTURE(texture), TEXTURE_SIZE(width, height)
        {}
        const TWeakObjectPtr<const UTexture2DDynamic> TEXTURE;
        const FIntVector2 TEXTURE_SIZE;
    };
#pragma endregion
 
#pragma region public API
public:
    TexturesCacheHandler();

    void FetchTextureFromUrl(const FString& url, FDownloadedTextureDelegateNative onThumbnailFetched);
#pragma endregion
 
#pragma region data
private:
    FCriticalSection m_cacheLock;
    TMap<FString, TArray<FDownloadedTextureDelegateNative>> m_pendingCallbacks;
    TMap<FString, TextureInfo> m_texturesCache;
 
    FCriticalSection m_wrapperLock;
    TArray<TSharedPtr<IImageWrapper>> m_imageWrappers;
#pragma endregion
};