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/// <summary>
/// 马赛克处理
/// </summary>
/// <param name="bitmap"></param>
/// <param name="effectWidth"> 影响范围 每一个格子数 </param>
/// <returns></returns>
public System.Drawing.Bitmap AdjustTobMosaic(System.Drawing.Bitmap bitmap, int effectWidth)
{
// 差异最多的就是以照一定范围取样 玩之后直接去下一个范围
for (int heightOfffset = 0; heightOfffset < bitmap.Height; heightOfffset += effectWidth)
{
for (int widthOffset =0; widthOffset < bitmap.Width; widthOffset += effectWidth)
{
int avgR = 0, avgG = 0, avgB = 0;
int blurPixelCount = 0;
for (int x = widthOffset; (x < widthOffset + effectWidth && x < bitmap.Width); x++)
{
for (int y = heightOfffset; (y < heightOfffset + effectWidth && y < bitmap.Height); y++)
{
System.Drawing.Color pixel = bitmap.GetPixel(x, y);
avgR += pixel.R;
avgG += pixel.G;
avgB += pixel.B;
blurPixelCount++;
}
}
// 计算范围平均
avgR = avgR / blurPixelCount;
avgG = avgG / blurPixelCount;
avgB = avgB / blurPixelCount;
// 所有范围内都设定此值
for (int x = widthOffset; (x < widthOffset + effectWidth && x < bitmap.Width); x++)
{
for (int y = heightOfffset; (y < heightOfffset + effectWidth && y < bitmap.Height); y++)
{
System.Drawing.Color newColor = System.Drawing.Color.FromArgb(avgR, avgG, avgB);
bitmap.SetPixel(x, y, newColor);
}
}
}
}
return bitmap;
}