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Update image parse code.

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soukoku
2015-02-19 22:30:13 -05:00
parent eef0b9db92
commit 9ba2b0d0e0
10 changed files with 284 additions and 182 deletions
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NTwain/WpfImageTools.cs Normal file
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using System.IO;
using System.Windows.Media.Imaging;
namespace NTwain
{
// this is in its own class to not depend on PresentationCore.dll on mono if it's not used.
/// <summary>
/// Contains extension methods for wpf images.
/// </summary>
public static class WpfImageTools
{
// <summary>
/// Loads a <see cref="Stream" /> into WPF <see cref="BitmapSource" />. The image created
/// will be a copy so the stream can be disposed once this call returns.
/// </summary>
/// <param name="stream">The image stream.</param>
/// <returns></returns>
public static BitmapSource ConvertToWpfBitmap(this Stream stream)
{
return ConvertToWpfBitmap(stream, 0, 0);
}
/// <summary>
/// Loads a <see cref="Stream" /> into WPF <see cref="BitmapSource" />. The image created
/// will be a copy so the stream can be disposed once this call returns.
/// </summary>
/// <param name="stream">The image stream.</param>
/// <param name="decodeWidth">Max width of the decoded image. Pass 0 to use default.</param>
/// <param name="decodeHeight">Max height of the decoded image. Pass 0 to use default.</param>
/// <returns></returns>
public static BitmapSource ConvertToWpfBitmap(this Stream stream, int decodeWidth, int decodeHeight)
{
if (stream != null)
{
var image = new BitmapImage();
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.DecodePixelHeight = decodeHeight;
image.DecodePixelWidth = decodeWidth;
image.StreamSource = stream;
image.EndInit();
if (image.CanFreeze)
{
image.Freeze();
}
return image;
}
return null;
}
///// <summary>
///// Converts an <see cref="Image"/> to WPF <see cref="BitmapSource"/> if the image
///// is a <see cref="Bitmap"/>.
///// </summary>
///// <param name="image">The image to convert.</param>
///// <returns></returns>
//public static BitmapSource ConvertToWpfBitmap(this Image image)
//{
// var bmp = image as Bitmap;
// if (bmp != null)
// {
// using (var hbm = new SafeHBitmapHandle(bmp.GetHbitmap(), true))
// {
// return System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
// hbm.DangerousGetHandle(),
// IntPtr.Zero,
// System.Windows.Int32Rect.Empty,
// BitmapSizeOptions.FromEmptyOptions());
// }
// }
// return null;
//}
//class SafeHBitmapHandle : SafeHandleZeroOrMinusOneIsInvalid
//{
// [SecurityCritical]
// public SafeHBitmapHandle(IntPtr preexistingHandle, bool ownsHandle)
// : base(ownsHandle)
// {
// SetHandle(preexistingHandle);
// }
// protected override bool ReleaseHandle()
// {
// return NativeMethods.DeleteObject(handle);
// }
//}
}
}