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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Media.Imaging;
using System.Runtime.InteropServices;
using System.Windows.Media;
using System.Windows;
using DirectShowLib;
using System.Windows.Interop;
using System.IO;
namespace Tango.Video.DirectShow
{
#region MakeBitmapSource
public class BitmapHelper
{
[DllImport("kernel32.dll", EntryPoint = "RtlMoveMemory")]
internal static extern void CopyMemory(IntPtr Destination, IntPtr Source, uint Length);
public static WriteableBitmap FromNativePointer(IntPtr pData, long dataLength, int w, int h, int ch, bool flipImage)
{
PixelFormat format = PixelFormats.Default;
int bitCount = 8;
if (ch == 1) format = PixelFormats.Gray8; //grey scale image 0-255
if (ch == 3)
{
format = PixelFormats.Bgr24; //RGB
bitCount = 24;
}
if (ch == 4)
{
format = PixelFormats.Bgr32; //RGB + alpha
bitCount = 32;
}
WriteableBitmap wbm = new WriteableBitmap(w, h, 96, 96, format, null);
if (flipImage)
{
int stride = ((w * bitCount / 8) + 3) & ~3;
unsafe
{
var pDest = (byte*)wbm.BackBuffer;
var pSrc = (byte*)pData;
pSrc += dataLength;
for (int i = 0; i < h; i++)
{
byte* pDstTmp = pDest + i * stride;
byte* pSrcTemp = pSrc - (i + 1) * stride;
CopyMemory((IntPtr)pDstTmp, (IntPtr)pSrcTemp, (uint)stride);
}
}
}
else
{
CopyMemory(wbm.BackBuffer, pData, (uint)(w * h * ch));
}
wbm.Lock();
wbm.AddDirtyRect(new Int32Rect(0, 0, wbm.PixelWidth, wbm.PixelHeight));
wbm.Unlock();
return wbm;
}
public static BitmapSource FromArray(byte[] data, int w, int h, int ch)
{
PixelFormat format = PixelFormats.Default;
if (ch == 1) format = PixelFormats.Gray8; //grey scale image 0-255
if (ch == 3) format = PixelFormats.Bgr24; //RGB
if (ch == 4) format = PixelFormats.Bgr32; //RGB + alpha
WriteableBitmap wbm = new WriteableBitmap(w, h, 96, 96, format, null);
wbm.WritePixels(new Int32Rect(0, 0, w, h), data, ch * w, 0);
return wbm;
}
public static BitmapSource CreateEmptySource(System.Windows.Size size, System.Windows.Media.Color color)
{
int width = (int)size.Width;
int height = (int)size.Height;
int stride = width / 8;
byte[] pixels = new byte[height * stride];
try
{
return BitmapSource.Create(width, height, 96, 96, PixelFormats.Indexed1, new BitmapPalette(new List<System.Windows.Media.Color> { color }), pixels, stride);
}
catch
{
width = 1920;
height = 1080;
stride = width / 8;
pixels = new byte[height * stride];
return BitmapSource.Create(width, height, 96, 96, PixelFormats.Indexed1, new BitmapPalette(new List<System.Windows.Media.Color> { color }), pixels, stride);
}
}
public static WriteableBitmap BitmapSourceToWriteableBitmap(BitmapSource source)
{
int stride = source.PixelWidth * (source.Format.BitsPerPixel / 8);
// Create data array to hold source pixel data
byte[] data = new byte[stride * source.PixelHeight];
// Copy source image pixels to the data array
source.CopyPixels(data, stride, 0);
// Create WriteableBitmap to copy the pixel data to.
WriteableBitmap target = new WriteableBitmap(
source.PixelWidth,
source.PixelHeight,
source.DpiX, source.DpiY,
source.Format, null);
// Write the pixel data to the WriteableBitmap.
target.WritePixels(
new Int32Rect(0, 0, source.PixelWidth, source.PixelHeight),
data, stride, 0);
return target;
}
}
#endregion
}
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