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 DrawString(IntPtr xftDraw, IntPtr xftColorPtr, XftFontExt fontExt, int x, int y, string text)
{
// todo: reuse buffer?
byte[] utf32Text = Encoding.UTF32.GetBytes(text);
GCHandle utf32TextHandle = GCHandle.Alloc(utf32Text, GCHandleType.Pinned);
try
{
IntPtr utf32TextPtr = utf32TextHandle.AddrOfPinnedObject();
int xOffset = 0;
foreach (var range in fontExt.GetRanges(utf32Text))
{
xOffset += DrawStringRange(xftDraw, xftColorPtr, range.Font, x + xOffset, y, utf32TextPtr, range.Start, range.End);
}
return(xOffset);
}
finally
{
utf32TextHandle.Free();
}
}