// TODO I believe this function measures how many characters will fit into the current line given the bounds.
public int MeasureLineWrap(TigFont font, TigTextStyle style, ReadOnlySpan <char> text, Rectangle bounds)
{
if (bounds.Width == 0)
{
return(text.Length);
}
Span <char> textCopy = stackalloc char[text.Length];
text.CopyTo(textCopy);
var iterator = new LayoutRunIterator(textCopy, font, bounds, style);
int endOfLine = 0;
while (iterator.MoveToNextRun(out var run))
{
if (run.Y <= bounds.Y)
{
endOfLine = run.End;
}
else
{
break;
}
}
return(endOfLine);
}
private void LayoutAndDrawVanilla(
Span <char> text,
TigFont font,
ref Rectangle extents,
TigTextStyle style)
{
var extentsWidth = extents.Width;
var extentsHeight = extents.Height;
if (extentsWidth == 0)
{
var metrics = new TigFontMetrics();
metrics.width = extents.Width;
metrics.height = extents.Height;
Tig.Fonts.Measure(style, text, ref metrics);
extents.Width = metrics.width;
extents.Height = metrics.height;
extentsWidth = metrics.width;
extentsHeight = metrics.height;
}
if ((style.flags & (TigTextStyleFlag.TTSF_BACKGROUND | TigTextStyleFlag.TTSF_BORDER)) != 0)
{
var rect = new Rectangle(
extents.X,
extents.Y,
Math.Max(extentsWidth, extents.Width),
Math.Max(extentsHeight, extents.Height)
);
DrawBackgroundOrOutline(rect, style);
}
var iterator = new LayoutRunIterator(text, font, extents, style);
while (iterator.MoveToNextRun(out var run))
{
if (run.Truncated)
{
_renderer.RenderRun(
"...",
run.X,
run.Y,
run.Bounds,
style,
font);
}
else
{
_renderer.RenderRun(
text.Slice(run.Start, run.End - run.Start),
run.X,
run.Y,
run.Bounds,
style,
font);
}
}
}