lyfz_repos/其他源码/LYFZ.ComponentLibrary/OtherExpansionControl/BitmapHelper.cs

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Security.Permissions;
namespace LYFZ.OtherExpansion
{
	public static class BitmapHelper
	{
		//[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
       // public unsafe static Color GetImageAverageColor(Bitmap bitmap)
		public static Color GetImageAverageColor(Bitmap bitmap)
		{
			if (bitmap == null)
			{
				throw new ArgumentNullException("bitmap");
			}
			int width = bitmap.Width;
			int height = bitmap.Height;
			Rectangle rect = new Rectangle(0, 0, width, height);
			Color result;
			try
			{
				BitmapData bitmapData = bitmap.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
				//byte* scan0 = (byte*)((void*)bitmapData.Scan0);
				int strideOffset = bitmapData.Stride - bitmapData.Width * 4;
				int sum = width * height;
				int a = 0;
				int r = 0;
				int g = 0;
				int b = 0;
				for (int i = 0; i < height; i++)
				{
                    //for (int j = 0; j < width; j++)
                    //{
                    //    int arg_79_0 = b;
                    //    byte* expr_72 = scan0;
                    //    scan0 = expr_72 + 1 / 1;
                    //    b = arg_79_0 + (int)(*expr_72);
                    //    int arg_87_0 = g;
                    //    byte* expr_80 = scan0;
                    //    scan0 = expr_80 + 1 / 1;
                    //    g = arg_87_0 + (int)(*expr_80);
                    //    int arg_95_0 = r;
                    //    byte* expr_8E = scan0;
                    //    scan0 = expr_8E + 1 / 1;
                    //    r = arg_95_0 + (int)(*expr_8E);
                    //    int arg_A3_0 = a;
                    //    byte* expr_9C = scan0;
                    //    scan0 = expr_9C + 1 / 1;
                    //    a = arg_A3_0 + (int)(*expr_9C);
                    //}
                    //scan0 += strideOffset / 1;
				}
				bitmap.UnlockBits(bitmapData);
				a /= sum;
				r /= sum;
				g /= sum;
				b /= sum;
				result = Color.FromArgb(255, r, g, b);
			}
			catch
			{
				result = Color.FromArgb(127, 127, 127);
			}
			return result;
		}
	}
}