UE4C++读取图片

很久以前的东西都找不到作者了，如果看到的话请告诉我

.h

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "Kismet/BlueprintFunctionLibrary.h"#include "LoadTexture.generated.h"/** *  */UCLASS()class AA_API ULoadTexture : public UBlueprintFunctionLibrary{GENERATED_BODY()public:UFUNCTION(BlueprintCallable, Category = "TextureFromDisk")static class UTexture2D* GetTexture2DFromDiskFile(const FString& FilePath);//载入图像UFUNCTION(Category = "ExtendedContent|File", BlueprintCallable)static UTexture2D* LoadTexture2D(const FString& ImagePath, bool& IsValid, int32& OutWidth, int32& OutHeight);};

.cpp

// Fill out your copyright notice in the Description page of Project Settings.#include "AA.h"#include "LoadTexture.h"#include "FileManagerGeneric.h"#include "Runtime/ImageWrapper/Public/Interfaces/IImageWrapper.h"  #include "Runtime/ImageWrapper/Public/Interfaces/IImageWrapperModule.h"  //#include "Kismet/KismetSystemLibrary.h"//UKismetSystemLibrary::QuitGame(this, nullptr, EQuitPreference::Quit);class UTexture2D* ULoadTexture::GetTexture2DFromDiskFile(const FString& FilePath){TArray<uint8> RawFileData;UTexture2D* MyTexture = NULL;if (FFileHelper::LoadFileToArray(RawFileData, *FilePath /*"<path to file>"*/)){IImageWrapperModule& ImageWrapperModule = FModuleManager::LoadModuleChecked<IImageWrapperModule>(FName("ImageWrapper"));// Note: PNG format.  Other formats are supportedIImageWrapperPtr ImageWrapper = ImageWrapperModule.CreateImageWrapper(EImageFormat::BMP);if (ImageWrapper.IsValid() && ImageWrapper->SetCompressed(RawFileData.GetData(), RawFileData.Num())){const TArray<uint8>* UncompressedBGRA = NULL;if (ImageWrapper->GetRaw(ERGBFormat::BGRA, 8, UncompressedBGRA)){// Create the UTexture for renderingMyTexture = UTexture2D::CreateTransient(ImageWrapper->GetWidth(), ImageWrapper->GetHeight(), PF_B8G8R8A8);// Fill in the source data from the filevoid* TextureData = MyTexture->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);FMemory::Memcpy(TextureData, UncompressedBGRA->GetData(), UncompressedBGRA->Num());MyTexture->PlatformData->Mips[0].BulkData.Unlock();// Update the rendering resource from data.MyTexture->UpdateResource();}}}return MyTexture;}static IImageWrapperPtr GetImageWrapperByExtention(const FString InImagePath){IImageWrapperModule& ImageWrapperModule = FModuleManager::LoadModuleChecked<IImageWrapperModule>(FName("ImageWrapper"));if (InImagePath.EndsWith(".png")){return ImageWrapperModule.CreateImageWrapper(EImageFormat::PNG);}else if (InImagePath.EndsWith(".jpg") || InImagePath.EndsWith(".jpeg")){return ImageWrapperModule.CreateImageWrapper(EImageFormat::JPEG);}else if (InImagePath.EndsWith(".bmp")){return ImageWrapperModule.CreateImageWrapper(EImageFormat::BMP);}else if (InImagePath.EndsWith(".ico")){return ImageWrapperModule.CreateImageWrapper(EImageFormat::ICO);}else if (InImagePath.EndsWith(".exr")){return ImageWrapperModule.CreateImageWrapper(EImageFormat::EXR);}else if (InImagePath.EndsWith(".icns")){return ImageWrapperModule.CreateImageWrapper(EImageFormat::ICNS);}return nullptr;}UTexture2D* ULoadTexture::LoadTexture2D(const FString& ImagePath, bool& IsValid, int32& OutWidth, int32& OutHeight){UTexture2D* Texture = nullptr;IsValid = false;if (!FPlatformFileManager::Get().GetPlatformFile().FileExists(*ImagePath)){return nullptr;}TArray<uint8> CompressedData;if (!FFileHelper::LoadFileToArray(CompressedData, *ImagePath)){return nullptr;}IImageWrapperPtr ImageWrapper = GetImageWrapperByExtention(ImagePath);if (ImageWrapper.IsValid() && ImageWrapper->SetCompressed(CompressedData.GetData(), CompressedData.Num())){const TArray<uint8>* UncompressedRGBA = nullptr;if (ImageWrapper->GetRaw(ERGBFormat::RGBA, 8, UncompressedRGBA)){Texture = UTexture2D::CreateTransient(ImageWrapper->GetWidth(), ImageWrapper->GetHeight(), PF_R8G8B8A8);if (Texture != nullptr){IsValid = true;OutWidth = ImageWrapper->GetWidth();OutHeight = ImageWrapper->GetHeight();void* TextureData = Texture->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);FMemory::Memcpy(TextureData, UncompressedRGBA->GetData(), UncompressedRGBA->Num());Texture->PlatformData->Mips[0].BulkData.Unlock();Texture->UpdateResource();}}}return Texture;}

PS: .h出错的话要在Build.cs 里加上 "ImageWrapper"