280 lines
9.8 KiB
C#
280 lines
9.8 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Runtime.InteropServices;
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namespace Sheng.Winform.Controls.Drawing
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{
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public class BmpAdjuster
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{
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#region 原有方法
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public delegate ColorPalette PaletteAdjustEvent(ColorPalette plt);
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public unsafe delegate void ConvertScanLineEvent(IntPtr srcLine, IntPtr dstLine, int width, int srcPixBit, int dstPixBit, Bitmap srcBmp, Bitmap dstBmp);
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private int alpha = 255;
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public BmpAdjuster()
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{
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}
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/// <summary>
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/// 初始化的时候给个alpha值,这样在灰图片的时候可以半透明
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/// </summary>
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/// <param name="alpha"></param>
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public BmpAdjuster(int alpha)
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{
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this.alpha = alpha;
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}
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public void AdjustColor(ref Bitmap bmp, PixelFormat format, PaletteAdjustEvent PalleteAdjust, ConvertScanLineEvent ConvertScanLine)
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{
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Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
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Bitmap bmpOut = new Bitmap(bmp.Width, bmp.Height, format);
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bmpOut.Palette = PalleteAdjust(bmpOut.Palette);
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PixelFormat srcFmt = bmp.PixelFormat;
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PixelFormat dstFmt = bmpOut.PixelFormat;
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int srcPixBit = GetPixelSize(srcFmt);
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int dstPixBit = GetPixelSize(dstFmt);
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BitmapData srcData = null;
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BitmapData dstData = null;
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try
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{
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srcData = bmp.LockBits(rect, ImageLockMode.ReadOnly, srcFmt);
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dstData = bmpOut.LockBits(rect, ImageLockMode.WriteOnly, dstFmt);
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unsafe
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{
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byte* srcLine = (byte*)srcData.Scan0.ToPointer();
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byte* dstLine = (byte*)dstData.Scan0.ToPointer();
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for (int L = 0; L < srcData.Height; L++)
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{
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ConvertScanLine((IntPtr)srcLine, (IntPtr)dstLine, srcData.Width, srcPixBit, dstPixBit, bmp, bmpOut);
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srcLine += srcData.Stride;
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dstLine += dstData.Stride;
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}
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}
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}
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finally
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{
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bmp.UnlockBits(srcData);
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bmpOut.UnlockBits(dstData);
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}
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bmp = bmpOut;
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}
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internal int GetPixelSize(PixelFormat format)
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{
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switch (format)
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{
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case PixelFormat.Format16bppRgb555: return 16;
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case PixelFormat.Format16bppRgb565: return 16;
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case PixelFormat.Format24bppRgb: return 24;
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case PixelFormat.Format32bppRgb: return 32;
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case PixelFormat.Format1bppIndexed: return 1;
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case PixelFormat.Format4bppIndexed: return 4;
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case PixelFormat.Format8bppIndexed: return 8;
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case PixelFormat.Format16bppArgb1555: return 16;
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case PixelFormat.Format32bppPArgb: return 32;
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case PixelFormat.Format16bppGrayScale: return 16;
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case PixelFormat.Format48bppRgb: return 48;
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case PixelFormat.Format64bppPArgb: return 64;
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case PixelFormat.Canonical: return 32;
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case PixelFormat.Format32bppArgb: return 32;
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case PixelFormat.Format64bppArgb: return 64;
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}
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return 0;
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}
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public unsafe void Monochrome(ref Bitmap bmp)
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{
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AdjustColor(ref bmp, PixelFormat.Format1bppIndexed,
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new PaletteAdjustEvent(SetBlackWhitePallete),
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new ConvertScanLineEvent(ConvertBlackWhiteScanLine));
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}
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ColorPalette SetBlackWhitePallete(ColorPalette plt)
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{
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plt.Entries[0] = Color.Black;
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plt.Entries[1] = Color.White;
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return plt;
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}
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unsafe void ConvertBlackWhiteScanLine(IntPtr srcLine, IntPtr dstLine, int width, int srcPixBit, int dstPixBit, Bitmap srcBmp, Bitmap dstBmp)
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{
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byte* src = (byte*)srcLine.ToPointer();
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byte* dst = (byte*)dstLine.ToPointer();
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int srcPixByte = srcPixBit / 8;
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int x, v, t = 0;
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for (x = 0; x < width; x++)
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{
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v = 28 * src[0] + 151 * src[1] + 77 * src[2];
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t = (t << 1) | (v > 200 * 256 ? 1 : 0);
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src += srcPixByte;
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if (x % 8 == 7)
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{
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*dst = (byte)t;
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dst++;
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t = 0;
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}
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}
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if ((x %= 8) != 7)
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{
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t <<= 8 - x;
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*dst = (byte)t;
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}
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}
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public void Gray(ref Bitmap bmp)
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{
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AdjustColor(ref bmp, PixelFormat.Format8bppIndexed,
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new PaletteAdjustEvent(SetGrayPallete),
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new ConvertScanLineEvent(ConvertGaryScanLine));
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}
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ColorPalette SetGrayPallete(ColorPalette plt)
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{
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//for (int i = plt.Entries.Length - 1; i >= 0; i--)
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// plt.Entries[i] = Color.FromArgb( i, i, i);
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for (int i = plt.Entries.Length - 1; i >= 0; i--)
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plt.Entries[i] = Color.FromArgb(alpha, i, i, i);
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return plt;
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}
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unsafe void ConvertGaryScanLine(IntPtr srcLine, IntPtr dstLine, int width, int srcPixBit, int dstPixBit, Bitmap srcBmp, Bitmap dstBmp)
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{
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byte* src = (byte*)srcLine.ToPointer();
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byte* dst = (byte*)dstLine.ToPointer();
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int srcPixByte = srcPixBit / 8;
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for (int x = 0; x < width; x++)
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{
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*dst = (byte)((28 * src[0] + 151 * src[1] + 77 * src[2]) >> 8);
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src += srcPixByte;
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dst++;
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}
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}
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#endregion
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/// <summary>
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/// 使图片单色化
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/// </summary>
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/// <param name="pimage"></param>
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/// <returns></returns>
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public static Bitmap MonochromeLockBits(Bitmap pimage)
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{
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Bitmap source = null;
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// If original bitmap is not already in 32 BPP, ARGB format, then convert
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if (pimage.PixelFormat != PixelFormat.Format32bppArgb)
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{
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source = new Bitmap(pimage.Width, pimage.Height, PixelFormat.Format32bppArgb);
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source.SetResolution(pimage.HorizontalResolution, pimage.VerticalResolution);
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using (Graphics g = Graphics.FromImage(source))
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{
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g.DrawImageUnscaled(pimage, 0, 0);
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}
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}
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else
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{
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source = pimage;
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}
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// Lock source bitmap in memory
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BitmapData sourceData = source.LockBits(new Rectangle(0, 0, source.Width, source.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
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// Copy image data to binary array
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int imageSize = sourceData.Stride * sourceData.Height;
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byte[] sourceBuffer = new byte[imageSize];
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Marshal.Copy(sourceData.Scan0, sourceBuffer, 0, imageSize);
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// Unlock source bitmap
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source.UnlockBits(sourceData);
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// Create destination bitmap
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Bitmap destination = new Bitmap(source.Width, source.Height, PixelFormat.Format1bppIndexed);
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// Lock destination bitmap in memory
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BitmapData destinationData = destination.LockBits(new Rectangle(0, 0, destination.Width, destination.Height), ImageLockMode.WriteOnly, PixelFormat.Format1bppIndexed);
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// Create destination buffer
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imageSize = destinationData.Stride * destinationData.Height;
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byte[] destinationBuffer = new byte[imageSize];
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int sourceIndex = 0;
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int destinationIndex = 0;
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int pixelTotal = 0;
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byte destinationValue = 0;
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int pixelValue = 128;
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int height = source.Height;
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int width = source.Width;
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int threshold = 500;
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// Iterate lines
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for (int y = 0; y < height; y++)
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{
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sourceIndex = y * sourceData.Stride;
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destinationIndex = y * destinationData.Stride;
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destinationValue = 0;
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pixelValue = 128;
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// Iterate pixels
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for (int x = 0; x < width; x++)
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{
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// Compute pixel brightness (i.e. total of Red, Green, and Blue values)
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pixelTotal = sourceBuffer[sourceIndex + 1] + sourceBuffer[sourceIndex + 2] + sourceBuffer[sourceIndex + 3];
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if (pixelTotal > threshold)
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{
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destinationValue += (byte)pixelValue;
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}
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if (pixelValue == 1)
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{
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destinationBuffer[destinationIndex] = destinationValue;
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destinationIndex++;
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destinationValue = 0;
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pixelValue = 128;
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}
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else
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{
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pixelValue >>= 1;
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}
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sourceIndex += 4;
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}
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if (pixelValue != 128)
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{
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destinationBuffer[destinationIndex] = destinationValue;
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}
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}
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// Copy binary image data to destination bitmap
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Marshal.Copy(destinationBuffer, 0, destinationData.Scan0, imageSize);
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// Unlock destination bitmap
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destination.UnlockBits(destinationData);
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// Dispose of source if not originally supplied bitmap
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if (source != pimage)
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{
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source.Dispose();
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}
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// Return
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return destination;
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}
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}
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}
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