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);
}
}
}
private void MeasureVanilla(TigFont font,
TigTextStyle style,
ReadOnlySpan <char> text,
ref TigFontMetrics metrics)
{
if (metrics.width == 0 && text.Contains('\n'))
{
metrics.width = MeasureVanillaParagraph(font, style, text);
}
var largestHeight = font.FontFace.LargestHeight;
if (metrics.width == 0)
{
metrics.width = MeasureVanillaLine(font, style, text);
metrics.height = largestHeight;
metrics.lines = 1;
metrics.lineheight = largestHeight;
return;
}
metrics.lines = 1; // Default
if (metrics.height != 0)
{
var maxLines = metrics.height / largestHeight;
if (!(style.flags.HasFlag(TigTextStyleFlag.TTSF_TRUNCATE)))
{
maxLines++;
}
if (maxLines != 1)
{
metrics.lines = CountLinesVanilla(metrics.width, maxLines, text, font, style);
}
}
else
{
if (!(style.flags.HasFlag(TigTextStyleFlag.TTSF_TRUNCATE)))
{
metrics.lines = CountLinesVanilla(metrics.width, 0, text, font, style);
}
}
if (metrics.height == 0)
{
metrics.height = metrics.lines * largestHeight;
metrics.height -= -(font.FontFace.BaseLine - largestHeight);
}
metrics.lineheight = largestHeight;
}
public void Measure(TigFont font, TigTextStyle style, ReadOnlySpan <char> text, ref TigFontMetrics metrics)
{
// use the old font drawing algorithm
MeasureVanilla(font, style, text, ref metrics);
}