# 运行时操作
# 创建贴图
程序运行时动态创建贴图，需要引入"Slate"和"SlateCore"模块。
UTexture2D* UMainUICppLogic::createTexture(const FString& FullFilePath)
{
UTexture2D* LoadedT2D = NULL;
IImageWrapperModule& ImageWrapperModule = FModuleManager::LoadModuleChecked<IImageWrapperModule>(FName("ImageWrapper"));
TSharedPtr<IImageWrapper> ImageWrapper = ImageWrapperModule.CreateImageWrapper(EImageFormat::PNG);
//Load From File
TArray<uint8> RawFileData;
if (!FFileHelper::LoadFileToArray(RawFileData, * FullFilePath))
{
return NULL;
}
//Create T2D!
if (ImageWrapper.IsValid() && ImageWrapper->SetCompressed(RawFileData.GetData(), RawFileData.Num()))
{
TArray64<uint8> UncompressedBGRA;
if (ImageWrapper->GetRaw(ERGBFormat::BGRA, 8, UncompressedBGRA))
{
LoadedT2D = UTexture2D::CreateTransient(ImageWrapper->GetWidth(), ImageWrapper->GetHeight(), PF_B8G8R8A8);
//Valid?
if (!LoadedT2D)
{
return NULL;
}
//Out!
//Copy!
void* TextureData = LoadedT2D->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
FMemory::Memcpy(TextureData, UncompressedBGRA.GetData(), UncompressedBGRA.Num());
LoadedT2D->PlatformData->Mips[0].BulkData.Unlock();
//Update!
LoadedT2D->UpdateResource();
}
}
// Success!
return LoadedT2D;
}
UTexture2D* UMainUICppLogic::LoadTexture2D_FromFile(const FString& FullFilePath,EImageFormat ImageFormat, bool& IsValid,int32& Width, int32& Height)
{
IsValid = false;
UTexture2D* LoadedT2D = NULL;
IImageWrapperModule& ImageWrapperModule = FModuleManager::LoadModuleChecked<IImageWrapperModule>(FName("ImageWrapper"));
IImageWrapperPtr ImageWrapper = ImageWrapperModule.CreateImageWrapper(ImageFormat);
//Load From File
TArray<uint8> RawFileData;
if (!FFileHelper::LoadFileToArray(RawFileData, * FullFilePath))
{
return NULL;
}
//Create T2D!
if (ImageWrapper.IsValid() && ImageWrapper->SetCompressed(RawFileData.GetData(), RawFileData.Num()))
{
TArray64<uint8> UncompressedBGRA;
if (ImageWrapper->GetRaw(ERGBFormat::BGRA, 8, UncompressedBGRA))
{
LoadedT2D = UTexture2D::CreateTransient(ImageWrapper->GetWidth(), ImageWrapper->GetHeight(), PF_B8G8R8A8);
//Valid?
if (!LoadedT2D)
{
return NULL;
}
//Out!
Width = ImageWrapper->GetWidth();
Height = ImageWrapper->GetHeight();
//Copy!
void* TextureData = LoadedT2D->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
FMemory::Memcpy(TextureData, UncompressedBGRA.GetData(), UncompressedBGRA.Num());
LoadedT2D->PlatformData->Mips[0].BulkData.Unlock();
//Update!
LoadedT2D->UpdateResource();
}
}
// Success!
IsValid = true;
return LoadedT2D;
}
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