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));
}
public void DrawString(Color color, FontConfig font, int x, int y, string text)
{
x -= origin.X;
y -= origin.Y;
var xftColorPtr = Marshal.AllocHGlobal(Marshal.SizeOf <XftColor>());
try
{
XRenderColor xColor = new XRenderColor(color);
LibXft.XftColorAllocValue(
display,
visual,
colormap,
ref xColor,
xftColorPtr
);
try
{
XftFontExt fontExt = objectCache.GetXftFont(font);
var fontInfo = Marshal.PtrToStructure <XftFont>(fontExt.MainFont);
int xOffset = DrawString(xftDraw, xftColorPtr, fontExt, x, y + fontInfo.ascent, text);
if (font.IsUnderline)
{
int lineHeight = Convert.ToInt32(Math.Max(font.Size / 10, 1));
LibXRender.XRenderFillRectangle(
display, PictOp.PictOpOver, pictureId, ref xColor,
x,
y + fontInfo.ascent + (fontInfo.descent - lineHeight) / 2,
(uint)xOffset,
(uint)lineHeight
);
}
if (font.IsStrikeout)
{
int lineHeight = Convert.ToInt32(Math.Max(font.Size / 20, 1));
LibXRender.XRenderFillRectangle
(
display, PictOp.PictOpOver, pictureId, ref xColor,
x,
y + fontInfo.ascent - (2 * fontInfo.ascent + 3 * lineHeight) / 6,
(uint)xOffset,
(uint)lineHeight
);
}
}
finally
{
LibXft.XftColorFree(display, visual, colormap, xftColorPtr);
}
}
finally
{
Marshal.FreeHGlobal(xftColorPtr);
}
}
