//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace BitmapProgramming
{
public partial class ModifyPixels : System.Windows.Window
{
public ModifyPixels()
{
InitializeComponent();
BitmapImage originalBmp = new BitmapImage();
originalBmp.BeginInit();
originalBmp.UriSource = new Uri(“http://www.your host.com/a.jpeg”);
originalBmp.DownloadCompleted += delegate{
BitmapSource prgbaSource = new FormatConvertedBitmap(originalBmp,PixelFormats.Pbgra32, null, 0);
WriteableBitmap bmp = new WriteableBitmap(prgbaSource);
int w = 20;
int h = 30;
int[] pixelData = new int[w * h];
int widthInBytes = 4 * w;
bmp.CopyPixels(pixelData, widthInBytes, 0);
for (int i = 0; i < pixelData.Length; ++i)
{
pixelData[i] ^= 0x00112233;
}
bmp.WritePixels(new Int32Rect(0, 0, w, h),pixelData, widthInBytes, 0);
imageElement.Source = bmp;
};
originalBmp.EndInit();
}
}
}
[/csharp]