public Boolean AllocateBitmap(int BmpWidth, int BmpHeight, ushort BitCount)//在内存中创建位图
{
if ((BitCount != 1) & (BitCount != 4) & (BitCount != 8) & (BitCount != 16) & (BitCount != 24) & (BitCount != 32))
{
return(false);
}
Dispose(false);
Win32Structure.BITMAPINFO BmpInfo = new Win32Structure.BITMAPINFO();
BmpInfo.Header.Size = (uint)sizeof(Win32Structure.BITMAPINFOHEADER);
BmpInfo.Header.Width = BmpWidth;
BmpInfo.Header.Height = -BmpHeight;
BmpInfo.Header.BitCount = BitCount;
BmpInfo.Header.Planes = 1;
BmpInfo.Header.Compression = Win32Const.BI_RGB;
BmpInfo.Header.XPelsPerMeter = 96;
BmpInfo.Header.YPelsPerMeter = 96;
BmpInfo.Header.ClrUsed = 0;
BmpInfo.Header.SizeImage = 0;
BmpInfo.Header.ClrImportant = 0;
BmpInfo.Header.SizeImage = 0;
IntPtr ScreecDC = Win32Api.GetDC(IntPtr.Zero);
m_Hdc = Win32Api.CreateCompatibleDC(ScreecDC);
int Result = Win32Api.ReleaseDC(IntPtr.Zero, ScreecDC);
m_Handle = Win32Api.CreateDIBSection(m_Hdc, ref BmpInfo, Win32Const.DIB_RGB_COLORS, out m_Pointer, IntPtr.Zero, 0);
if (m_Handle == IntPtr.Zero)
{
m_Hdc = IntPtr.Zero; m_Width = 0; m_Height = 0; m_Stride = 0; m_BitCount = BitCount;
return(false);
}
else
{
Win32Api.SelectObject(m_Hdc, m_Handle);
m_Width = BmpWidth; m_Height = BmpHeight; m_BitCount = BitCount;
switch (BitCount)
{
case 1: m_Stride = (int)(((m_Width + 7) / 8 + 3) & 0XFFFFFFFC); break;
case 4: m_Stride = (int)(((m_Width + 1) / 2 + 3) & 0XFFFFFFFC); break;
case 8: m_Stride = (int)((m_Width + 3) & 0XFFFFFFFC); break;
case 16: m_Stride = (int)((m_Width * 2 + 3) & 0XFFFFFFFC); break;
case 24: m_Stride = (int)((m_Width * 3 + 3) & 0XFFFFFFFC); break;
case 32: m_Stride = m_Width * 4; break;
}
if (m_BitCount <= 8)
{
m_PaletteAddress = Marshal.AllocHGlobal(1024);
m_PaletteSize = 1 << (m_BitCount);
}
return(true);
}
}
internal static extern IntPtr CreateDIBSection(IntPtr Hdc, ref Win32Structure.BITMAPINFO BmpInfo, uint iUsage, out IntPtr ppvBits, IntPtr hSection, uint dwOffset);