ckfinder/_source/Connector/Quantizer.cs

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

/* 
  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF 
  ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A 
  PARTICULAR PURPOSE. 
  
    This is sample code and is freely distributable. 
*/ 

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;

namespace ImageManipulation
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	public abstract class Quantizer
	{
		/// <summary>
		/// Construct the quantizer
		/// </summary>
		/// <param name="singlePass">If true, the quantization only needs to loop through the source pixels once</param>
		/// <remarks>
		/// If you construct this class with a true value for singlePass, then the code will, when quantizing your image,
		/// only call the 'QuantizeImage' function. If two passes are required, the code will call 'InitialQuantizeImage'
		/// and then 'QuantizeImage'.
		/// </remarks>
		public Quantizer ( bool singlePass )
		{
			_singlePass = singlePass ;
			_pixelSize = Marshal.SizeOf(typeof (Color32));
		}

		/// <summary>
		/// Quantize an image and return the resulting output bitmap
		/// </summary>
		/// <param name="source">The image to quantize</param>
		/// <returns>A quantized version of the image</returns>
		public Bitmap Quantize ( Image source )
		{
			// Get the size of the source image
			int	height = source.Height ;
			int width = source.Width ;

			// And construct a rectangle from these dimensions
			Rectangle	bounds = new Rectangle ( 0 , 0 , width , height ) ;

			// First off take a 32bpp copy of the image
			Bitmap	copy = new Bitmap ( width , height , PixelFormat.Format32bppArgb ) ;

			// And construct an 8bpp version
			Bitmap	output = new Bitmap ( width , height , PixelFormat.Format8bppIndexed ) ;

			// Now lock the bitmap into memory
			using ( Graphics g = Graphics.FromImage ( copy ) )
			{
				g.PageUnit = GraphicsUnit.Pixel ;