/// <summary>
/// Converts BitmapSource to Mat
/// </summary>
/// <param name="src">Input BitmapSource</param>
/// <returns>IplImage</returns>
public static Mat ToMat(this BitmapSource src)
{
if (src == null)
{
throw new ArgumentNullException(nameof(src));
}
int w = src.PixelWidth;
int h = src.PixelHeight;
MatType type = WriteableBitmapConverter.GetOptimumType(src.Format);
Mat dst = new Mat(h, w, type);
ToMat(src, dst);
return(dst);
}
/// <summary>
/// Converts BitmapSource to Mat
/// </summary>
/// <param name="src">Input BitmapSource</param>
/// <param name="dst">Output Mat</param>
public static void ToMat(this BitmapSource src, Mat dst)
{
if (src == null)
{
throw new ArgumentNullException(nameof(src));
}
if (dst == null)
{
throw new ArgumentNullException(nameof(dst));
}
if (src.PixelWidth != dst.Width || src.PixelHeight != dst.Height)
{
throw new ArgumentException("size of src must be equal to size of dst");
}
if (dst.Dims > 2)
{
throw new ArgumentException("Mat dimensions must be 2");
}
int w = src.PixelWidth;
int h = src.PixelHeight;
int bpp = src.Format.BitsPerPixel;
int channels = WriteableBitmapConverter.GetOptimumChannels(src.Format);
if (dst.Channels() != channels)
{
throw new ArgumentException("nChannels of dst is invalid", nameof(dst));
}
bool submat = dst.IsSubmatrix();
bool continuous = dst.IsContinuous();
unsafe
{
byte *p = (byte *)(dst.Data);
long step = dst.Step();
// 1bppは手作業でコピー
if (bpp == 1)
{
if (submat)
{
throw new NotImplementedException("submatrix not supported");
}
// BitmapImageのデータを配列にコピー
// 要素1つに横8ピクセル分のデータが入っている。
int stride = (w / 8) + 1;
byte[] pixels = new byte[h * stride];
src.CopyPixels(pixels, stride, 0);
int x = 0;
for (int y = 0; y < h; y++)
{
int offset = y * stride;
// この行の各バイトを調べていく
for (int bytePos = 0; bytePos < stride; bytePos++)
{
if (x < w)
{
// 現在の位置のバイトからそれぞれのビット8つを取り出す
byte b = pixels[offset + bytePos];
for (int i = 0; i < 8; i++)
{
if (x >= w)
{
break;
}
p[step * y + x] = ((b & 0x80) == 0x80) ? (byte)255 : (byte)0;
b <<= 1;
x++;
}
}
}
// 次の行へ
x = 0;
}
}
// 8bpp
/*else if (bpp == 8)
* {
* int stride = w;
* byte[] pixels = new byte[h * stride];
* src.CopyPixels(pixels, stride, 0);
* for (int y = 0; y < h; y++)
* {
* for (int x = 0; x < w; x++)
* {
* p[step * y + x] = pixels[y * stride + x];
* }
* }
* }*/
// 24bpp, 32bpp, ...
else
{
int stride = w * ((bpp + 7) / 8);
if (!submat && continuous)
{
long imageSize = dst.DataEnd.ToInt64() - dst.Data.ToInt64();
if (imageSize < 0)
{
throw new OpenCvSharpException("The mat has invalid data pointer");
}
if (imageSize > int.MaxValue)
{
throw new OpenCvSharpException("Too big mat data");
}
src.CopyPixels(Int32Rect.Empty, dst.Data, (int)imageSize, stride);
}
else
{
// 高さ1pxの矩形ごと(≒1行ごと)にコピー
var roi = new Int32Rect {
X = 0, Y = 0, Width = w, Height = 1
};
IntPtr dstData = dst.Data;
for (int y = 0; y < h; y++)
{
roi.Y = y;
src.CopyPixels(roi, dstData, stride, stride);
dstData = new IntPtr(dstData.ToInt64() + stride);
}
}
}
}
}