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我正在尝试将本地图像数据结构编组到BitmapSource中。
这是本地结构体:
struct Bitmap_8Bit
{
public:
unsigned char* data;
int stride;
int rows;
int cols;
int nChannels; //either 1 or 3. in case of three the order of the channels is BGR
};
这是我的编组函数:
template<>
inline
System::Windows::Media::Imaging::BitmapSource^ marshal_as<System::Windows::Media::Imaging::BitmapSource^, Bitmap_8Bit>(const Bitmap_8Bit& nativeBitmap)
{
System::Windows::Media::PixelFormat format = System::Windows::Media::PixelFormats::Default;
System::Windows::Media::Imaging::BitmapPalette^ palette = nullptr;
if (nativeBitmap.nChannels == 1)
{
format = System::Windows::Media::PixelFormats::Gray8;
palette = System::Windows::Media::Imaging::BitmapPalettes::Gray256;
}
else if (nativeBitmap.nChannels == 3)
{
format = System::Windows::Media::PixelFormats::Bgr24;
palette = System::Windows::Media::Imaging::BitmapPalettes::Halftone256;
}
else
{
throw gcnew System::InvalidOperationException("Unsupported number of channels " + nativeBitmap.nChannels);
}
//copy data
int pixelDataLength = nativeBitmap.rows*nativeBitmap.stride;
System::IntPtr source = System::IntPtr(nativeBitmap.data);
cli::array<unsigned char>^ buffer = gcnew cli::array<unsigned char>(pixelDataLength);
System::Runtime::InteropServices::Marshal::Copy(source, buffer, 0, pixelDataLength);
System::Windows::Media::Imaging::BitmapSource^ managedBitmap =
System::Windows::Media::Imaging::BitmapSource::Create(nativeBitmap.cols, nativeBitmap.rows,
96, 96,
format, palette,
buffer, nativeBitmap.stride);
return managedBitmap;
}
我正在简单的单通道案例上测试我的函数:
BSII::IP::Bitmap_8Bit native;
native.cols = 8;
native.rows = 4;
native.nChannels = 1;
native.stride = 8;
int dataLength = native.stride * native.rows;
native.data = new unsigned char[dataLength];
unsigned char gray = 0;
for (int i = 0; i < native.rows; ++i)
{
for (int j = 0; j < native.cols; ++j)
{
native.data[native.stride*i + j] = gray;
gray += 10;
}
}
System::Windows::Media::Imaging::BitmapSource^ managed = msclr::interop::marshal_as<System::Windows::Media::Imaging::BitmapSource^>(native);
System::IO::FileStream^ stream = gcnew System::IO::FileStream("c:\\workspace\\temp\\managed.bmp", System::IO::FileMode::Create);
System::Windows::Media::Imaging::BmpBitmapEncoder^ encoder = gcnew System::Windows::Media::Imaging::BmpBitmapEncoder();
System::Windows::Media::Imaging::BitmapFrame^ bitmapFrame = System::Windows::Media::Imaging::BitmapFrame::Create(managed);
encoder->Frames->Add(bitmapFrame);
encoder->Save(stream);
stream->Close();
这段代码有问题。在调试时,我发现缓冲数组中的值是正确的,但是当我将BitmapSource保存为图像时,它看起来并不像应该的样子。
我尝试过使用nullptr替换灰度256或Halftone256作为调色板,但仍然无法解决问题。
我认为我在使用BitmapSource时漏掉了一些东西。有什么建议吗?
谢谢, Dina