C#将图形快速处理成不规则区域

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C#将图形快速处理成不规则区域

来源：
http://blog.sina.com.cn/u/589d32f5010009nf

using System.Runtime.InteropServices;

[DllImport("gdi32.dll")]

public static extern IntPtr ExtCreateRegion(IntPtr lpXform, uint nCount,

ref byte lpRgnData);

public static int RGN_AND = 1;

public static int RGN_OR = 2;

public static int RGN_XOR = 3;

public static int RGN_DIFF = 4;

public static int RGN_COPY = 5;

public static int RGN_MIN = RGN_AND;

public static int RGN_MAX = RGN_COPY;

[DllImport("gdi32.dll")]

public static extern int CombineRgn(IntPtr hrgnDest, IntPtr hrgnSrc1, IntPtr hrgnSrc2,

int fnCombineMode);

[DllImport("gdi32.dll")]

public static extern bool DeleteObject(IntPtr hObject);

public Region ImageToRegion(Image AImage, Color ATransparent)

{

//转贴请注明出处ZswangY37(wjhu111#21cn.com) 时间2007-05-25

if (AImage == null) return null;

Bitmap vBitmap = new Bitmap(AImage);

BitmapData vBitmapData = vBitmap.LockBits(

new Rectangle(0, 0, vBitmap.Width, vBitmap.Height),

ImageLockMode.ReadOnly, PixelFormat.Format32bppRgb);

int vAddress = (int)vBitmapData.Scan0;

int vOffset = vBitmapData.Stride - vBitmap.Width * 4; // 每行多出的字节数

int h = vBitmap.Height, w = vBitmap.Width;

int vTransparent = ColorTranslator.ToWin32(ATransparent); // 透明色

int vAllocRect = (0x1000 - sizeof(uint) * 8) / sizeof(int); // 预分配的矩形数

if (h * w < vAllocRect) vAllocRect = h * w;

Byte[] vBuffer = new byte[sizeof(uint) * 8 + sizeof(int) * 4 * vAllocRect];

//头信息dwSize/iType/nCount/nRegSize

uint vCount = 0;

vBuffer[0] = sizeof(uint) * 8; //dwSize//头信息大小

vBuffer[4] = 1; //iType//int RDH_RECTANGLES = 1;//数据类型

IntPtr vResult = IntPtr.Zero;

uint vPointer = sizeof(uint) * 8;

bool vWriteRect = false;

bool vWriteAlways = false;

for (int y = 0; y < h; y++)

{

int vBlockStart = 0;

bool vLastMaskBit = false;

for (int x = 0; x < w; x++)

{

int i = Marshal.ReadInt32((IntPtr)vAddress) & 0x00FFFFFF;

if (vTransparent == i) // 透明色

{

if (vLastMaskBit)

vWriteRect = true;

}

else

{

if (!vLastMaskBit)

{

vBlockStart = x;

vLastMaskBit = true;

}

if (x == w - 1)

{

if (y == h - 1)

{

vWriteRect = true;

vWriteAlways = true;

}

else if (vLastMaskBit)

{

vWriteRect = true;

}

x++;

}

if (vWriteRect)

{

if (vLastMaskBit)

{

vCount++;

WriteRect(vBuffer, ref vPointer,

new Rectangle(vBlockStart, y, x - vBlockStart, 1));

}

if (vCount == vAllocRect || vWriteAlways)

{

vBuffer[8] = (byte)vCount;

vBuffer[9] = (byte)(vCount >> 8);

vBuffer[10] = (byte)(vCount >> 16);

vBuffer[11] = (byte)(vCount >> 24);

IntPtr hTemp = ExtCreateRegion(IntPtr.Zero,

sizeof(uint) * 8 + sizeof(int) * 4 * vCount,

ref vBuffer[0]);

if (vResult == IntPtr.Zero)

vResult = hTemp;

else

{

CombineRgn(vResult, vResult, hTemp, RGN_OR);

DeleteObject(hTemp);

}

vCount = 0;

vPointer = sizeof(uint) * 4;

vWriteAlways = false;

}

vWriteRect = false;

vLastMaskBit = false;

}

vAddress += 4;

}

vAddress += vOffset;

}

vBitmap.UnlockBits(vBitmapData);

return Region.FromHrgn(vResult);

}

private void WriteRect(byte[] ARGNData, ref uint ptr, Rectangle r)

{

ARGNData[ptr] = (byte)r.X;

ARGNData[ptr + 1] = (byte)(r.X >> 8);

ARGNData[ptr + 2] = (byte)(r.X >> 16);

ARGNData[ptr + 3] = (byte)(r.X >> 24);

ARGNData[ptr + 4] = (byte)r.Y;

ARGNData[ptr + 5] = (byte)(r.Y >> 8);

ARGNData[ptr + 6] = (byte)(r.Y >> 16);

ARGNData[ptr + 7] = (byte)(r.Y >> 24);

ARGNData[ptr + 8] = (byte)r.Right;

ARGNData[ptr + 9] = (byte)(r.Right >> 8);

ARGNData[ptr + 10] = (byte)(r.Right >> 16);

ARGNData[ptr + 11] = (byte)(r.Right >> 24);

ARGNData[ptr + 12] = (byte)r.Bottom;

ARGNData[ptr + 13] = (byte)(r.Bottom >> 8);

ARGNData[ptr + 14] = (byte)(r.Bottom >> 16);

ARGNData[ptr + 15] = (byte)(r.Bottom >> 24);

ptr += 16;

}

private void button1_Click(object sender, EventArgs e)

{

Region = ImageToRegion(pictureBox1.Image, Color.FromArgb(216, 233, 236));

}

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