internal extern static int FillRect(
IntPtr hDC,
ref NativeStructs.RECT lprc,
IntPtr hbr);
/// <summary>
/// Measures text with the given graphics context, font, string, location, and anti-aliasing flag.
/// </summary>
/// <param name="g">The Graphics context to measure for.</param>
/// <param name="font">The Font to measure with.</param>
/// <param name="text">The string of text to measure.</param>
/// <param name="antiAliasing">Whether the font should be rendered with anti-aliasing.</param>
public static Size MeasureString(Graphics g, Font font, string text, bool antiAliasing, FontSmoothing fontSmoothing)
{
if (fontSmoothing == FontSmoothing.Smooth && antiAliasing)
{
PixelOffsetMode oldPOM = g.PixelOffsetMode;
g.PixelOffsetMode = PixelOffsetMode.Half;
TextRenderingHint oldTRH = g.TextRenderingHint;
g.TextRenderingHint = TextRenderingHint.AntiAlias;
StringFormat format = (StringFormat)StringFormat.GenericTypographic.Clone();
format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
SizeF sf = g.MeasureString(text, font, new PointF(0, 0), format);
sf.Height = font.GetHeight();
g.PixelOffsetMode = oldPOM;
g.TextRenderingHint = oldTRH;
return(Size.Ceiling(sf));
}
else if (fontSmoothing == FontSmoothing.Sharp || !antiAliasing)
{
IntPtr hdc = IntPtr.Zero;
IntPtr hFont = IntPtr.Zero;
IntPtr hOldObject = IntPtr.Zero;
try
{
hdc = g.GetHdc();
hFont = CreateFontObject(font, antiAliasing);
hOldObject = SafeNativeMethods.SelectObject(hdc, hFont);
NativeStructs.RECT rect = new NativeStructs.RECT();
rect.left = 0;
rect.top = 0;
rect.right = rect.left;
rect.bottom = rect.top;
int result = SafeNativeMethods.DrawTextW(
hdc,
text,
text.Length,
ref rect,
NativeConstants.DT_CALCRECT |
NativeConstants.DT_LEFT |
NativeConstants.DT_NOCLIP |
NativeConstants.DT_NOPREFIX |
NativeConstants.DT_SINGLELINE |
NativeConstants.DT_TOP);
if (result == 0)
{
NativeMethods.ThrowOnWin32Error("DrawTextW returned 0");
}
return(new Size(rect.right - rect.left, rect.bottom - rect.top));
}
finally
{
if (hOldObject != IntPtr.Zero)
{
SafeNativeMethods.SelectObject(hdc, hOldObject);
hOldObject = IntPtr.Zero;
}
if (hFont != IntPtr.Zero)
{
SafeNativeMethods.DeleteObject(hFont);
hFont = IntPtr.Zero;
}
if (hdc != IntPtr.Zero)
{
g.ReleaseHdc(hdc);
hdc = IntPtr.Zero;
}
}
}
else
{
throw new InvalidEnumArgumentException("fontSmoothing = " + (int)fontSmoothing);
}
}
internal static extern int DrawTextW(
IntPtr hdc,
string lpString,
int nCount,
ref NativeStructs.RECT lpRect,
uint uFormat);
