图片合并代码,CSharp代码库,德仔网

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【CSharp】图片合并
作者: / 发布于2011/1/12/ 494
<div> /// <summary>
 /// 合并两张图片，支持不透明度和透明色
 /// </summary>
 /// <param name="b0">图片一</param>
 /// <param name="b1">图片二</param>
 /// <param name="X">起始坐标X</param>
 /// <param name="Y">起始坐标Y</param>
 /// <param name="b1_alpha">图片二的不透明度</param>
 /// <param name="TransColor">被作为透明色处理的颜色</param>
 /// <param name="delta">透明色的容差，类似Ps中的魔棒的容差。</param>
 /// <returns>合并后的图片</returns>
 public static Bitmap KiMerge(Bitmap b0, Bitmap b1, int X, int Y, int b1_alpha,Color TransColor,int delta)
 {
 if (b0.Equals(null) || b1.Equals(null))
 {
 return null;
 }
<div> int w0 = b0.Width;
 int h0 = b0.Height;</div>
<div> int w1 = b1.Width;
 int h1 = b1.Height;</div>
<div> int w, h;</div>
<div> if (X + w1 > w0)
 {
 w = w0 - X;
 }
 else
 {
 w = w1;
 }
<div> if (Y + h1 > h0)
 {
 h = h0 - Y;
 }
 else
 {
 h = h1;
 }
<div> BitmapData srcData = b0.LockBits(new Rectangle(X, Y, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
 BitmapData dstData = b1.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);</div>
<div> unsafe
 {
 byte* pIn = (byte*)srcData.Scan0.ToPointer();
 byte* pLogo = (byte*)dstData.Scan0.ToPointer();</div>
<div> for (int y = 0; y < h; y++)
 {
 for (int x = 0; x < w; x++)
 {</div>
<div> // 判断透明色
 Color c = Color.FromArgb(pLogo[2], pLogo[1], pLogo[0]);
 if (!ColorIsSimilar(c, TransColor, delta))
 {</div>
<div> float bili = (float)b1_alpha / (float)255; // 不是透明色，加权平均
 float inbili = 1.0f - bili;</div>
<div> int r, g, b;</div>
<div> b = (int)(pIn[0] * inbili + pLogo[0] * bili);
 g = (int)(pIn[1] * inbili + pLogo[1] * bili);
 r = (int)(pIn[2] * inbili + pLogo[2] * bili);</div>
<div> pIn[0] = (byte)b;
 pIn[1] = (byte)g;
 pIn[2] = (byte)r;
 }
 pIn += 3;
 pLogo += 3;
 }
<div>
 pIn += srcData.Stride - w * 3;
 pLogo += dstData.Stride - w * 3;
 }
<div> b0.UnlockBits(srcData);
 b1.UnlockBits(dstData);
 }
<div> return b0;
 }
<div></div>
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