C# Bitmap 处理

最新推荐文章于 2025-05-31 21:34:00 发布

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本文介绍了三种不同的位图深拷贝方法：使用锁位、绘图API和句柄对象来实现位图的完全复制。这些方法适用于不同场景，帮助开发者有效避免因位图共享导致的问题。

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/// <summary>
/// 拷贝
/// </summary>
/// <param name="bitmap"></param>
/// <returns></returns>
private Bitmap DeepCopyBitmap(Bitmap bitmap)
{
//Stopwatch watch = Stopwatch.StartNew();
try
{
//Image<Hsv,int>
if (bitmap == null || bitmap.PixelFormat == PixelFormat.DontCare)
return null;

var rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
Bitmap temp = new Bitmap(rect.Width, rect.Height, bitmap.PixelFormat);
var palette = bitmap.Palette;
if (palette.Entries.Length > 0)
temp.Palette = palette;
var tempData = temp.LockBits(rect, ImageLockMode.ReadWrite, bitmap.PixelFormat);
var bmpData = bitmap.LockBits(rect, ImageLockMode.ReadOnly, bitmap.PixelFormat);
int length = bmpData.Stride * bmpData.Height;
int tLength = tempData.Stride * tempData.Height;
byte[] pixs = new byte[length];
Marshal.Copy(bmpData.Scan0, pixs, 0, length);
bitmap.UnlockBits(bmpData);
Marshal.Copy(pixs, 0, tempData.Scan0, tLength);
temp.UnlockBits(tempData);
return temp;
}
catch (Exception ex)
{
return null;
}
finally
{
}

}

private Bitmap DeepCopyBitmap2(Bitmap bitmap)
{
try
{
Bitmap bmp2 = new Bitmap(bitmap.Width, bitmap.Height, bitmap.PixelFormat);
//将第一个bmp拷贝到bmp2中
Graphics draw = Graphics.FromImage(bmp2);
draw.DrawImage(bitmap, 0, 0);
draw.Dispose();
bitmap.Dispose();//释放bmp文件资源
return bmp2;
}
catch (Exception ex)
{
return null;
}
finally
{
}
}


   [System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);

private Bitmap DeepCopyBitmap3(Bitmap bitmap)
{
IntPtr jb = bitmap.GetHbitmap();
Bitmap bittemp = Bitmap.FromHbitmap(jb);
DeleteObject(jb);
bitmap.Dispose();
return bittemp;
}