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Adjust cell height automatically for buggy fonts that draw brackets outside the bounding box

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See https://github.com/cormullion/juliamono/issues/14
This commit is contained in:
Kovid Goyal 2020-08-06 14:06:06 +05:30
parent dad355b932
commit 5555a66638
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GPG Key ID: 06BC317B515ACE7C
3 changed files with 11 additions and 6 deletions
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2
docs/changelog.rst
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@ -14,6 +14,8 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
- Fix a regression in the previous release that could cause an exception during
startup in rare circumstances (:iss:`2896`)
- Adjust cell height automatically for buggy fonts that draw brackets outside the bounding box
0.18.2 [2020-07-28]
--------------------

2
kitty/core_text.m
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@ -336,7 +336,7 @@ cell_metrics(PyObject *s, unsigned int* cell_width, unsigned int* cell_height, u
*strikethrough_thickness = *underline_thickness;
// float line_height = MAX(1, floor(self->ascent + self->descent + MAX(0, self->leading) + 0.5));
// Let CoreText's layout engine calculate the line height. Slower, but hopefully more accurate.
#define W "AQWMH_gyl "
#define W "A{Q](WMH_gyl "
CFStringRef ts = CFSTR(W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W);
#undef W
CFMutableAttributedStringRef test_string = CFAttributedStringCreateMutable(kCFAllocatorDefault, CFStringGetLength(ts));

13
kitty/freetype.c
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@ -125,11 +125,14 @@ static inline unsigned int
calc_cell_height(Face *self, bool for_metrics) {
unsigned int ans = font_units_to_pixels_y(self, self->height);
if (for_metrics) {
unsigned int underscore_height = get_height_for_char(self, '_');
if (underscore_height > ans) {
if (global_state.debug_font_fallback) printf(
"Increasing cell height by %u pixels to work around buggy font that renders underscore outside the bounding box\n", underscore_height - ans);
return underscore_height;
static const char chars[] = "_{[(";
for (unsigned i = 0; i < arraysz(chars) - 1; i++) {
unsigned int char_height = get_height_for_char(self, chars[i]);
if (char_height > ans) {
if (global_state.debug_font_fallback) printf(
"Increasing cell height by %u pixels to work around buggy font that renders '%c' outside the bounding box\n", char_height - ans, chars[i]);
ans = char_height;
}
}
}
return ans;