public unsafe void Roundtrip_Bitmap_719x405()
{
int width = 719;
int height = 405;
using (Bitmap bmp = new Bitmap($"img/testpattern_{width}x{height}.bmp"))
{
byte[] bgr = BitmapToBuffer(bmp, out int stride);
byte[] i420 = PixelConverter.BGRtoI420(bgr, width, height, stride);
Assert.NotNull(i420);
byte[] rtBgr = PixelConverter.I420toBGR(i420, width, height, out int rtStride);
Assert.NotNull(rtBgr);
fixed(byte *pBgr = rtBgr)
{
Bitmap rtBmp = new Bitmap(width, height, rtStride, System.Drawing.Imaging.PixelFormat.Format24bppRgb, new IntPtr(pBgr));
rtBmp.Save($"roundtrip_bitmap_{width}x{height}.bmp");
rtBmp.Dispose();
}
}
}
public unsafe void RoundtripBgr24ToI420Test()
{
Bitmap bmp = new Bitmap("img/ref-bgr24.bmp");
// BGR formats get recognised as RGB but when rendered by WPF are treated as BGR.
Assert.Equal(PixelFormat.Format24bppRgb, bmp.PixelFormat);
byte[] buffer = BitmapToBuffer(bmp);
byte[] i420 = PixelConverter.BGRtoI420(buffer, bmp.Width, bmp.Height);
byte[] bgr = PixelConverter.I420toBGR(i420, bmp.Width, bmp.Height);
fixed(byte *s = bgr)
{
Bitmap roundTripBmp = new Bitmap(bmp.Width, bmp.Height, (int)bmp.Width * 3, PixelFormat.Format24bppRgb, (IntPtr)s);
roundTripBmp.Save("RoundtripBgr24ToI420Test.bmp");
roundTripBmp.Dispose();
}
bmp.Dispose();
}
private static byte[] BitmapToI420(Bitmap bmp)
{
var buffer = BitmapToByteArray(bmp, out int stride);
return(PixelConverter.BGRtoI420(buffer, bmp.Width, bmp.Height, stride));
}