public Size MeasureString(FontConfig font, string text)
{
XftFontExt fontExt = objectCache.GetXftFont(font);
byte[] utf32Text = Encoding.UTF32.GetBytes(text);
int width = 0;
GCHandle utf32TextHandle = GCHandle.Alloc(utf32Text, GCHandleType.Pinned);
try
{
IntPtr utf32TextPtr = utf32TextHandle.AddrOfPinnedObject();
foreach (var range in fontExt.GetRanges(utf32Text))
{
LibXft.XftTextExtents32(
display,
range.Font,
utf32TextPtr + range.Start,
(range.End - range.Start) / 4,
out var extents
);
width += extents.xOff;
}
}
finally
{
utf32TextHandle.Free();
}
var fontInfo = Marshal.PtrToStructure <XftFont>(fontExt.MainFont);
return(new Size(width, fontInfo.height));
}
private int DrawStringRange(
IntPtr xftDraw,
IntPtr xftColorPtr,
IntPtr font,
int x,
int y,
IntPtr utf32TextPtr,
int rangeStart,
int rangeEnd
)
{
LibXft.XftTextExtents32(
display,
font,
utf32TextPtr + rangeStart,
(rangeEnd - rangeStart) / 4,
out var extents
);
LibXft.XftDrawString32(
xftDraw,
xftColorPtr,
font,
x,
y,
utf32TextPtr + rangeStart,
(rangeEnd - rangeStart) / 4
);
return(extents.xOff);
}