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ue4加载本地图片_ue4 C++ 导入图片

news 来源：原创 2024/4/26 12:22:48

导入本地图片

void SDrawHouseTypeTools::OnButtonClickLoadImage()

{

//打开文件夹

TArray OpenFilenames;

TSharedPtr ParentWindow = FSlateApplication::Get().GetActiveTopLevelWindow();

void* ParentWindowHandle = (ParentWindow.IsValid() && ParentWindow->GetNativeWindow().IsValid()) ? ParentWindow->GetNativeWindow()->GetOSWindowHandle() : nullptr;

if (ExtendFunc::OpenFileDialog(

ParentWindowHandle,

NSLOCTEXT("UIHome", "OpenReferencePictureTitle", "打开户型图片文件...").ToString(),

FPaths::GameDir(),

TEXT(""),

ExtendFunc::EFileDialogFlags::None,

OpenFilenames))

{

if (OpenFilenames.Num() > 0)

{

FString OpenFilename = OpenFilenames[0];

FName BrushName(*OpenFilename);

//传了图片路径，返回可以用来显示在runtime中的图片纹理

if (SpriteTexture.IsValid() && SpriteTexture->IsRooted())

{

SpriteTexture->RemoveFromRoot();

}

// 判断图片得格式是否正确

SpriteTexture = TWeakObjectPtr(GetTexture2DFromDiskFile(OpenFilename));

if (SpriteTexture.IsValid())

{

SpriteTexture->AddToRoot();

//将数据存储并导入到画图方法中

FIntPoint ImageSize = FIntPoint(SpriteTexture->GetSizeX(), SpriteTexture->GetSizeY());

IHardModeModule::Get().GetImageSize() = ImageSize;

TextureAlpha = 0.5;

HardEdMode->OnHouseImgAlphaChanged(TextureAlpha);

HardEdMode->SetHouseImg(SpriteTexture.Get(), ImageSize);

}

else

{

FMessageDialog::Open(EAppMsgType::Ok, FText::FromString(TEXT("请导入正确格式的图片！")));

OnButtonClickLoadImage();

}

//获取图片纹理

UTexture2D* SDrawHouseTypeTools::GetTexture2DFromDiskFile(const FString& FilePath)

{

// 如果找到该文件，则返回true，否则为false

if (!FPaths::FileExists(FilePath))

{

UE_LOG(LogTemp, Error, TEXT("File not found: %s"), *FilePath);

return nullptr;

}

// 从文件中加载压缩的字节数据

TArray FileData;

if (!FFileHelper::LoadFileToArray(FileData, *FilePath))

{

UE_LOG(LogTemp, Error, TEXT("Failed to load file: %s"), *FilePath);

return nullptr;

}

// 使用ImageWrapper模块检测图像类型

IImageWrapperModule& ImageWrapperModule = FModuleManager::LoadModuleChecked(TEXT("ImageWrapper"));

EImageFormat::Type ImageFormat = ImageWrapperModule.DetectImageFormat(FileData.GetData(), FileData.Num());

if (ImageFormat == EImageFormat::Invalid)

{

UE_LOG(LogTemp, Error, TEXT("Unrecognized image file format: %s"), *FilePath);

return nullptr;

}

// 为检测到的图像格式创建一个图像包装

IImageWrapperPtr ImageWrapper = ImageWrapperModule.CreateImageWrapper(ImageFormat);

if (!ImageWrapper.IsValid())

{

UE_LOG(LogTemp, Error, TEXT("Failed to create image wrapper for file: %s"), *FilePath);

return nullptr;

}

// 解压图像数据

const TArray* RawData = nullptr;

ImageWrapper->SetCompressed(FileData.GetData(), FileData.Num());

ImageWrapper->GetRaw(ERGBFormat::BGRA, 8, RawData);

if (RawData == nullptr)

{

UE_LOG(LogTemp, Error, TEXT("Failed to decompress image file: %s"), *FilePath);

return nullptr;

}

// 创建纹理并上传未压缩的图像数据

FString TextureBaseName = TEXT("Texture_") + FPaths::GetBaseFilename(FilePath);

// UObject* Outer = nullptr;

UTexture2D* mytexture = MyCreateTexture(*RawData, ImageWrapper->GetWidth(), ImageWrapper->GetHeight(), EPixelFormat::PF_B8G8R8A8, FName(*TextureBaseName));

return mytexture;

}

UTexture2D* SDrawHouseTypeTools::MyCreateTexture(const TArray& PixelData, int32 InSizeX, int32 InSizeY, EPixelFormat InFormat, FName BaseName)

{

// 无耻地抄袭UTexture2D:CreateTransient一些修改

if (InSizeX <= 0 || InSizeY <= 0 || (InSizeX % GPixelFormats[InFormat].BlockSizeX) != 0 || (InSizeY % GPixelFormats[InFormat].BlockSizeY) != 0)

{

return nullptr;

}

// 最重要的不同之处在于UTexture2D::CreateTransient:我们为新结构提供一个名称和一个所有者

UTexture2D* NewTexture = NewObject(GetTransientPackage(), NAME_None, RF_Transient);

NewTexture->PlatformData = new FTexturePlatformData();