public static Standard.SafeDC CreateCompatibleDC(Standard.SafeDC hdc)
{
Standard.SafeDC edc = null;
try
{
IntPtr zero = IntPtr.Zero;
if (hdc != null)
{
zero = hdc.handle;
}
edc = NativeMethods.CreateCompatibleDC(zero);
if (edc == null)
{
Standard.HRESULT.ThrowLastError();
}
}
finally
{
if (edc != null)
{
edc._created = true;
}
}
if (edc.IsInvalid)
{
edc.Dispose();
throw new SystemException("Unable to create a device context from the specified device information.");
}
return(edc);
}
public static void UpdateLayeredWindow(IntPtr hwnd, Standard.SafeDC hdcDst, ref Standard.POINT pptDst, ref Standard.SIZE psize, Standard.SafeDC hdcSrc, ref Standard.POINT pptSrc, int crKey, ref Standard.BLENDFUNCTION pblend, Standard.ULW dwFlags)
{
if (!_UpdateLayeredWindow(hwnd, hdcDst, ref pptDst, ref psize, hdcSrc, ref pptSrc, crKey, ref pblend, dwFlags))
{
Standard.HRESULT.ThrowLastError();
}
}
public static IntPtr SelectObject(Standard.SafeDC hdc, IntPtr hgdiobj)
{
IntPtr ptr = _SelectObject(hdc, hgdiobj);
if (ptr == IntPtr.Zero)
{
Standard.HRESULT.ThrowLastError();
}
return(ptr);
}
private static int _GetBitDepth()
{
if (s_bitDepth == 0)
{
using (Standard.SafeDC edc = Standard.SafeDC.GetDesktop())
{
s_bitDepth = Standard.NativeMethods.GetDeviceCaps(edc, Standard.DeviceCap.BITSPIXEL) * Standard.NativeMethods.GetDeviceCaps(edc, Standard.DeviceCap.PLANES);
}
}
return(s_bitDepth);
}
static DpiHelper()
{
using (Standard.SafeDC edc = Standard.SafeDC.GetDesktop())
{
int deviceCaps = Standard.NativeMethods.GetDeviceCaps(edc, Standard.DeviceCap.LOGPIXELSX);
int num2 = Standard.NativeMethods.GetDeviceCaps(edc, Standard.DeviceCap.LOGPIXELSY);
_transformToDip = Matrix.Identity;
_transformToDip.Scale(96.0 / ((double)deviceCaps), 96.0 / ((double)num2));
_transformToDevice = Matrix.Identity;
_transformToDevice.Scale(((double)deviceCaps) / 96.0, ((double)num2) / 96.0);
}
}
public static Standard.SafeHBITMAP CreateDIBSection(Standard.SafeDC hdc, ref Standard.BITMAPINFO bitmapInfo, out IntPtr ppvBits, IntPtr hSection, int dwOffset)
{
Standard.SafeHBITMAP ehbitmap = null;
if (hdc == null)
{
ehbitmap = _CreateDIBSectionIntPtr(IntPtr.Zero, ref bitmapInfo, 0, out ppvBits, hSection, dwOffset);
}
else
{
ehbitmap = _CreateDIBSection(hdc, ref bitmapInfo, 0, out ppvBits, hSection, dwOffset);
}
if (ehbitmap.IsInvalid)
{
Standard.HRESULT.ThrowLastError();
}
return(ehbitmap);
}
public static Standard.SafeDC GetDC(IntPtr hwnd)
{
Standard.SafeDC dC = null;
try
{
dC = NativeMethods.GetDC(hwnd);
}
finally
{
if (dC != null)
{
dC.Hwnd = hwnd;
}
}
if (dC.IsInvalid)
{
Standard.HRESULT.E_FAIL.ThrowIfFailed();
}
return(dC);
}
public static Standard.SafeDC CreateDC(string deviceName)
{
Standard.SafeDC edc = null;
try
{
edc = NativeMethods.CreateDC(deviceName, null, IntPtr.Zero, IntPtr.Zero);
}
finally
{
if (edc != null)
{
edc._created = true;
}
}
if (edc.IsInvalid)
{
edc.Dispose();
throw new SystemException("Unable to create a device context from the specified device information.");
}
return(edc);
}
public static extern int GetDeviceCaps(Standard.SafeDC hdc, Standard.DeviceCap nIndex);
private static extern Standard.SafeHBITMAP _CreateDIBSection(Standard.SafeDC hdc, [In] ref Standard.BITMAPINFO bitmapInfo, int iUsage, out IntPtr ppvBits, IntPtr hSection, int dwOffset);
private static extern bool _UpdateLayeredWindow(IntPtr hwnd, Standard.SafeDC hdcDst, [In] ref Standard.POINT pptDst, [In] ref Standard.SIZE psize, Standard.SafeDC hdcSrc, [In] ref Standard.POINT pptSrc, int crKey, ref Standard.BLENDFUNCTION pblend, Standard.ULW dwFlags);
private static extern IntPtr _SelectObjectSafeHBITMAP(Standard.SafeDC hdc, Standard.SafeHBITMAP hgdiobj);
private static extern IntPtr _SelectObject(Standard.SafeDC hdc, IntPtr hgdiobj);
