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Support SGR 9 for strikethrough effect on text.

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This is mostly easy: it's just like drawing an underline, except that
you put it at a different height in the character cell. The only
question is _where_ in the character cell.

Pango, and Windows GetOutlineTextMetrics, will tell you exactly where
the font wants to have it. Following xterm, I fall back to 3/8 of the
font's ascent (above the baseline) if either of those is unavailable.
This commit is contained in:
Simon Tatham
2020-08-13 21:08:53 +01:00
parent 334d87251e
commit 06a8d11964
6 changed files with 52 additions and 15 deletions
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2
unix/gtkfont.h
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@ -67,7 +67,7 @@ typedef struct unifont {
/*
* Font dimensions needed by clients.
*/
int width, height, ascent, descent;
int width, height, ascent, descent, strikethrough_y;
/*
* Indicates whether this font is capable of handling all glyphs