pixel.cs

功能：基于windows mobile 的地图查看器。使用vs2005开发

using System;
using System.Drawing;

namespace GXGraphicsLibrary
{
#if USE_GXLIBS

	/// <summary>
	/// Encapsulates the functionality of converting pixel formats.
	/// </summary>
	public class Pixel
	{
		/// <summary>
		/// Delegate for converting a pixel to a 32 bit ARGB pixel.
		/// </summary>
		public PixelToARGBDelegate PixelToARGB = null;
		public delegate uint PixelToARGBDelegate(ushort pixel);

		/// <summary>
		/// Delegate for converting System.Drawing.Color to the device's pixel
		/// format.
		/// </summary>
		public ColorToPixelDelegate ColorToPixel = null;
		public delegate ushort ColorToPixelDelegate(Color col);

		/// <summary>
		/// Delegate for converting a 32-bit ARGB pixel to the device's pixel
		/// format.
		/// </summary>
		public ARGBToPixelDelegate ARGBToPixel = null;
		public delegate ushort ARGBToPixelDelegate(uint col);

		/// <summary>
		/// Delegate for converting a 16-bit BGR pixel to the device's pixel
		/// format.
		/// </summary>
		public BGRToPixelNoShiftDelegate BGRToPixelNoShift = null;
		public delegate ushort BGRToPixelNoShiftDelegate(byte blue, byte green, byte red);

		/// <summary>
		/// Delegate for converting a 24-bit BGR pixel to the device's pixel
		/// format.
		/// </summary>
		public BGRToPixelDelegate BGRToPixel = null;
		public delegate ushort BGRToPixelDelegate(byte blue, byte green, byte red);

		/// <summary>
		/// Delegate for breaking a pixel into its red, green, and blue components
		/// </summary>
		public PixelToBGRDelegate PixelToBGR = null;
		public delegate void PixelToBGRDelegate(ushort pixel, ref ushort blue, ref ushort green, ref ushort red);

		/// <summary>
		/// Create an instance of this class given the specified pixel format.
		/// The format will be used to initialize all delegates.
		/// </summary>
		/// <param name="pixelFormat">Device pixel format</param>
		public Pixel(uint pixelFormat)
		{
			if ((pixelFormat & (uint)GAPI.kfDirect565) == (uint)GAPI.kfDirect565)
			{
				ColorToPixel = new ColorToPixelDelegate(ColorToPixel565);
				ARGBToPixel = new ARGBToPixelDelegate(ARGBToPixel565);
				BGRToPixel = new BGRToPixelDelegate(BGRToPixel565);
				BGRToPixelNoShift = new BGRToPixelNoShiftDelegate(BGRToPixelNoShift565);
				PixelToBGR = new PixelToBGRDelegate(PixelToBGR565);
				PixelToARGB = new PixelToARGBDelegate(PixelToARGB565);
			}
			else
			{
				ColorToPixel = new ColorToPixelDelegate(ColorToPixel555);
				ARGBToPixel = new ARGBToPixelDelegate(ARGBToPixel555);
				BGRToPixel = new BGRToPixelDelegate(BGRToPixel555);
				BGRToPixelNoShift = new BGRToPixelNoShiftDelegate(BGRToPixelNoShift555);
				PixelToBGR = new PixelToBGRDelegate(PixelToBGR555);
				PixelToARGB = new PixelToARGBDelegate(PixelToARGB555);
			}
		}

		/// <summary>
		/// Converts 888 BGR values to a 565 RGB formatted pixel.
		/// </summary>
		/// <param name="blue">8-bit blue component</param>
		/// <param name="green">8-bit green component</param>
		/// <param name="red">8-bit red component</param>
		/// <returns>A 16-bit 565 RGB formatted pixel</returns>
		public ushort BGRToPixel565(byte blue, byte green, byte red)
		{
			return (ushort)((((ushort)red >> 3) << 11) | (((ushort)green >> 2) << 5) | ((ushort)blue >> 3));
		}

		/// <summary>
		/// Converts 565 BGR values to a 565 RGB formatted pixel.
		/// </summary>
		/// <param name="blue">5-bit blue component</param>
		/// <param name="green">6-bit green component</param>
		/// <param name="red">5-bit red component</param>
		/// <returns>A 16-bit 565 RGB formatted pixel</returns>
		public ushort BGRToPixelNoShift565(byte blue, byte green, byte red)
		{
			return (ushort)((((ushort)red) << 11) | (((ushort)green) << 5) | ((ushort)blue));
		}

		/// <summary>
		/// Converts a 565 RGB formatted pixel to its RGB components
		/// </summary>
		/// <param name="pixel">Pixel</param>
		/// <param name="blue">Reference to blue component</param>
		/// <param name="green">Reference to green component</param>
		/// <param name="red">Reference to red component</param>
		public void PixelToBGR565(ushort pixel, ref ushort blue, ref ushort green, ref ushort red)
		{
			red = (ushort)((pixel & 0xf800) >> 11);
			green = (ushort)((pixel & 0x07e0) >> 5);
			blue = (ushort)((pixel & 0x001f));
		}

		/// <summary>
		/// Converts 888 BGR values to a 555 RGB formatted pixel.
		/// </summary>
		/// <param name="blue">8-bit blue component</param>
		/// <param name="green">8-bit green component</param>
		/// <param name="red">8-bit red component</param>
		/// <returns>A 15-bit 555 RGB formatted pixel</returns>
		public ushort BGRToPixel555(byte blue, byte green, byte red)
		{
			return (ushort)((((ushort)red >> 3) << 10) | (((ushort)green >> 3) << 5) | ((ushort)blue >> 3));
		}

		/// <summary>
		/// Converts 555 BGR values to a 555 RGB formatted pixel.
		/// </summary>
		/// <param name="blue">5-bit blue component</param>
		/// <param name="green">5-bit green component</param>
		/// <param name="red">5-bit red component</param>
		/// <returns>A 15-bit 555 RGB formatted pixel</returns>
		public ushort BGRToPixelNoShift555(byte blue, byte green, byte red)
		{
			return (ushort)((((ushort)red) << 10) | (((ushort)green) << 5) | ((ushort)blue));
		}

		/// <summary>
		/// Converts a 555 RGB formatted pixel to its RGB components
		/// </summary>
		/// <param name="pixel">Pixel</param>
		/// <param name="blue">Reference to blue component</param>
		/// <param name="green">Reference to green component</param>
		/// <param name="red">Reference to red component</param>
		public void PixelToBGR555(ushort pixel, ref ushort blue, ref ushort green, ref ushort red)
		{
			red = (ushort)((pixel & 0x7c00) >> 10);
			green = (ushort)((pixel & 0x03e0) >> 5);
			blue = (ushort)((pixel & 0x001f));
		}

		/// <summary>
		/// Converts a System.Drawing.Color object to a 565 RGB formatted pixel.
		/// </summary>
		/// <param name="col">Color to be converted</param>
		/// <returns>A 16-bit 565 RGB formatted pixel</returns>
		public ushort ColorToPixel565(Color col)
		{
			return ((ushort)((((ushort)col.R >> 3) << 11) | (((ushort)col.G >> 2) << 5) | ((ushort)col.B >> 3)));
		}

		/// <summary>
		/// Converts a System.Drawing.Color object to a 555 RGB formatted pixel.
		/// </summary>
		/// <param name="col">Color to be converted</param>
		/// <returns>A 15-bit 555 RGB formatted pixel</returns>
		public ushort ColorToPixel555(Color col)
		{
			return ((ushort)((((ushort)col.R >> 3) << 10) | (((ushort)col.G >> 3) << 5) | ((ushort)col.B >> 3)));
		}

		/// <summary>
		/// Converts a 32-bit ARGB pixel value to a 565 RGB formatted pixel.
		/// </summary>
		/// <param name="col">ARGB color to be converted</param>
		/// <returns>A 16-bit 565 RGB formatted pixel</returns>
		public ushort ARGBToPixel565(uint col)
		{
			return ((ushort)(((col >> 8) & 0xf800) | ((col >> 5) & 0x07e0) | ((col >> 3) & 0x001f)));
		}

		/// <summary>
		/// Converts a 565 RGB formatted pixel to a 32-bit ARGB pixel.
		/// </summary>
		/// <param name="pixel">A 16-bit 565 RGB formatted pixel</param>
		/// <returns>ARGB converted pixel</returns>
		public uint PixelToARGB565(ushort pixel)
		{
			uint bigPixel = (uint)pixel;
			return 0x00f8fcf8 & ((bigPixel << 8) | (bigPixel << 5) | (bigPixel << 3));
		}

		/// <summary>
		/// Converts a 555 RGB formatted pixel to a 32-bit ARGB pixel.
		/// </summary>
		/// <param name="pixel">A 16-bit 555 RGB formatted pixel</param>
		/// <returns>ARGB converted pixel</returns>
		public uint PixelToARGB555(ushort pixel)
		{
			uint bigPixel = (uint)pixel;
			return 0x00f8f8f8 & ((bigPixel << 9) | (bigPixel << 6) | (bigPixel << 3));
		}

		/// <summary>
		/// Converts a 32-bit ARGB pixel value to a 555 RGB formatted pixel.
		/// </summary>
		/// <param name="col">ARGB color to be converted</param>
		/// <returns>A 15-bit 555 RGB formatted pixel</returns>
		public ushort ARGBToPixel555(uint col)
		{
			return ((ushort)(((col >> 9) & 0x7c00) | ((col >> 6) & 0x03d0) | ((col >> 3) & 0x001f)));
		}
	}
#endif
}