private static LOGFONT CreatePointFontStruct(string fontName, int pointSize, bool bold, bool italic)
{
const byte DEFAULT_CHARSET = 1;
const long FW_BOLD = 700;
const int LOGPIXELSY = 90;
LOGFONT font = new LOGFONT();
font.lfCharSet = DEFAULT_CHARSET;
font.lfFaceName = fontName;
if (bold)
{
font.lfWeight = FW_BOLD;
}
if (italic)
{
font.lfItalic = 1;
}
using (GraphicsContext context = GraphicsContext.CreateOffscreenContext())
{
font.lfHeight = -NativeMethods.MulDiv(pointSize, context.GetCapability(LOGPIXELSY), 72);
}
return(font);
}
public Bitmap Duplicate()
{
// Technique taken from here: http://stackoverflow.com/questions/5687263/copying-a-bitmap-from-another-hbitmap
using (var sourceContext = GraphicsContext.CreateOffscreenContext())
{
using (var destContext = sourceContext.CreateCompatibleContext())
{
const int SRCCOPY = 0x00CC0020;
var header = Header;
sourceContext.CurrentBitmap = this;
NativeMethods.BitBlt(sourceContext.Handle, 0, 0, header.bmWidth, header.bmHeight, destContext.Handle, 0, 0, SRCCOPY);
return(destContext.CreateBitmap(header.bmWidth, header.bmHeight));
}
}
}
private static Bitmap LoadImageFromBitmapSource(NativeMethods.IWICBitmapSource source)
{
int width, height;
source.GetSize(out width, out height);
BITMAPINFO info = new BITMAPINFO();
info.biSize = Marshal.SizeOf <BITMAPINFOHEADER>();
info.biWidth = width;
info.biHeight = -height; // the negation is required here
info.biPlanes = 1;
info.biBitCount = 32;
info.biCompression = 0; // == BL_RGB
using (GraphicsContext context = GraphicsContext.CreateOffscreenContext())
{
IntPtr imageBits = IntPtr.Zero;
IntPtr hBitmap = NativeMethods.CreateDIBSection(context.Handle, ref info, 0, out imageBits, IntPtr.Zero, 0);
if (hBitmap == IntPtr.Zero)
{
throw new System.ComponentModel.Win32Exception();
}
int stride = width * 4;
int cbImage = stride * height;
try
{
source.CopyPixels(IntPtr.Zero, stride, cbImage, imageBits);
return(new Bitmap(hBitmap));
}
catch
{
NativeMethods.DeleteObject(hBitmap);
throw;
}
}
}
