UE4读取处理PNG像素数据

    const FString ImagePath = TEXT("D:\\1670.png");

    if (!FPlatformFileManager::Get().GetPlatformFile().FileExists(*ImagePath)) {
		return;
	}
	TArray<uint8> RawFileData;

	if (!FFileHelper::LoadFileToArray(RawFileData, *ImagePath)) {
		return;
	}
	IImageWrapperModule& ImageWrapperModule =                 
    FModuleManager::LoadModuleChecked<IImageWrapperModule>(FName("ImageWrapper"));
	
	IImageWrapperPtr ImageWrapper =   
    ImageWrapperModule.CreateImageWrapper(EImageFormat::PNG);

	if (ImageWrapper.IsValid() && ImageWrapper->SetCompressed(RawFileData.GetData(), 
     RawFileData.Num()))
	{
        const TArray<uint8> *UncompressedBGRA=NULL;
		if (ImageWrapper->GetRaw(ERGBFormat::BGRA, 8, UncompressedBGRA))
		{
			Width = ImageWrapper->GetWidth();
			Height = ImageWrapper->GetHeight();

			 
		}
	}

1、将PNG文件二进制数据读入到 RawFileData;

2、用ImageWrapper模块将RawFileData转换成UncompressedBGRA图像数据。

FVector Location = GetActorLocation();
FRotator Rotator = GetActorRotation();

ULineBatchComponent*LineBatcher = GetWorld()->PersistentLineBatcher;


if (LineBatcher != NULL) {
    
    float offset = 0.0f;
    for (int32 j = 0; j < Width; j++) {

        offset = j * (XScale * 256 + 0.1);

        TArray<FBatchedLine> Lines;
        FBatchedLine Line1, Line2;

        for (int32 i = 0; i < Height - 2; i += 2) {

            Line1.Start = Rotator.RotateVector(FVector(((*UncompressedBGRA)[(i     *Width + j) * 4] - 128)*XScale + offset, 0.0f, i     *ZScale) + Location);
            Line1.End   = Rotator.RotateVector(FVector(((*UncompressedBGRA)[((i + 1)*Width + j) * 4] - 128)*XScale + offset, 0.0f, (i + 1)*ZScale) + Location);

            Line2.Start = Rotator.RotateVector(FVector(((*UncompressedBGRA)[((i + 1)*Width + j) * 4] - 128)*XScale + offset, 0.0f, (i + 1) *ZScale) + Location);
            Line2.End   = Rotator.RotateVector(FVector(((*UncompressedBGRA)[((i + 2)*Width + j) * 4] - 128)*XScale + offset, 0.0f, (i + 2) *ZScale) + Location);

            Lines.Add(Line1);
            Lines.Add(Line2);

        }
        LineBatcher->DrawLines(Lines);

    }

}

3、按列处理图像数据，并绘制曲线