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CoreText: Use the layout engine to calculate cell height

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Slower, but hopefully more accurate, since it takes into account
whatever kludges Apple is currently using to calculate line height
in its applications.
This commit is contained in:
Kovid Goyal
2017-12-13 14:12:23 +05:30
parent 869abc4d5c
commit b9d0ec0d4c
1 changed files with 17 additions and 2 deletions
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19
kitty/core_text.m
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@@ -245,11 +245,26 @@ cell_metrics(PyObject *s, unsigned int* cell_width, unsigned int* cell_height, u
}
}
*cell_width = MAX(1, width);
float line_height = MAX(1, floor(self->ascent + self->descent + MAX(0, self->leading) + 0.5));
*cell_height = (unsigned int)line_height;
*underline_position = floor(self->ascent - self->underline_position + 0.5);
*underline_thickness = (unsigned int)ceil(MAX(0.1, self->underline_thickness));
*baseline = (unsigned int)self->ascent;
// 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.
CFStringRef ts = CFSTR("test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test");
CFMutableAttributedStringRef test_string = CFAttributedStringCreateMutable(kCFAllocatorDefault, CFStringGetLength(ts));
CFAttributedStringReplaceString(test_string, CFRangeMake(0, 0), ts);
CFAttributedStringSetAttribute(test_string, CFRangeMake(0, CFStringGetLength(ts)), kCTFontAttributeName, self->ct_font);
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, CGRectMake(10, 10, 200, 200));
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(test_string);
CFRelease(test_string);
CTFrameRef test_frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL);
CGPoint origin1, origin2;
CTFrameGetLineOrigins(test_frame, CFRangeMake(0, 1), &origin1);
CTFrameGetLineOrigins(test_frame, CFRangeMake(1, 1), &origin2);
CGFloat line_height = origin1.y - origin2.y;
CFRelease(test_frame); CFRelease(path); CFRelease(framesetter);
*cell_height = MAX(4, (unsigned int)ceilf(line_height));
#undef count
}