public static IntPtr CreateDIBSection(IntPtr hdc, ref BitmapInfo bitmapInfo,
DibBmiColorUsageFlag iUsage, out IntPtr ppvBits, IntPtr hSection, uint dwOffset)
{
using (var pbmi = BitmapInfo.NativeAlloc(ref bitmapInfo))
{
return(Gdi32Methods.CreateDIBSection(hdc, pbmi.GetDangerousHandle(), iUsage, out ppvBits, hSection,
dwOffset));
}
}
public static IntPtr CreateDIBitmap(IntPtr hdc, ref BitmapInfoHeader
lpbmih, uint fdwInit, byte[] lpbInit, ref BitmapInfo bitmapInfo,
DibBmiColorUsageFlag fuUsage)
{
using (var pbmi = BitmapInfo.NativeAlloc(ref bitmapInfo))
{
return(Gdi32Methods.CreateDIBitmap(hdc, ref lpbmih, fdwInit, lpbInit, pbmi.GetDangerousHandle(),
fuUsage));
}
}
public static int SetDIBitsToDevice(IntPtr hdc, int xDest, int yDest, uint
dwWidth, uint dwHeight, int xSrc, int ySrc, uint uStartScan, uint cScanLines,
byte[] lpvBits, ref BitmapInfo bitmapInfo, DibBmiColorUsageFlag fuColorUse)
{
using (var pbmi = BitmapInfo.NativeAlloc(ref bitmapInfo))
{
return(Gdi32Methods.SetDIBitsToDevice(hdc, xDest, yDest,
dwWidth, dwHeight, xSrc, ySrc, uStartScan, cScanLines, lpvBits, pbmi.GetDangerousHandle(),
fuColorUse));
}
}
public unsafe NativeBitmapInfoHandle(ref BitmapInfo bitmapInfo) : base(new IntPtr(0))
{
var quads = bitmapInfo.Colors;
var quadsLength = quads.Length;
if (quadsLength == 0)
{
quadsLength = 1;
}
var success = false;
var ptr = IntPtr.Zero;
try
{
ptr =
Marshal.AllocHGlobal(Marshal.SizeOf <BitmapInfoHeader>() + Marshal.SizeOf <RgbQuad>() * quadsLength);
var headerPtr = (BitmapInfoHeader *)ptr.ToPointer();
* headerPtr = bitmapInfo.Header;
var quadPtr = (RgbQuad *)(headerPtr + 1);
var i = 0;
for (; i < quads.Length; i++)
{
*(quadPtr + i) = quads[i];
}
if (i == 0)
{
*quadPtr = new RgbQuad();
}
this.SetHandle(ptr);
success = true;
}
finally
{
if (!success)
{
this.SetHandleAsInvalid();
Marshal.FreeHGlobal(ptr);
}
}
}
public static NativeBitmapInfoHandle NativeAlloc(ref BitmapInfo bitmapInfo)
{
return(new NativeBitmapInfoHandle(ref bitmapInfo));
}