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Function to check if the font has a specified character

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This commit is contained in:
Kovid Goyal 2017-01-10 22:44:40 +05:30
parent d4f18d9581
commit edf9e580fe
1 changed files with 24 additions and 0 deletions
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24
kitty/core_text.m
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@ -7,6 +7,7 @@
#include "data-types.h"
#include <structmember.h>
#include <stdint.h>
#import <CoreText/CTFont.h>
#import <Foundation/NSString.h>
#import <Foundation/NSDictionary.h>
@ -78,6 +79,28 @@ dealloc(Face* self) {
Py_TYPE(self)->tp_free((PyObject*)self);
}
static void
encode_utf16_pair(uint32_t character, unichar *units) {
unsigned int code;
assert(0x10000 <= character && character <= 0x10FFFF);
code = (character - 0x10000);
units[0] = 0xD800 | (code >> 10);
units[1] = 0xDC00 | (code & 0x3FF);
}
static PyObject*
has_char(Face *self, PyObject *args) {
#define has_char_doc "True iff this font has glyphs for the specified character"
int ch, count = 1;
unichar chars[2] = {0};
CGGlyph glyphs[2] = {0};
if (!PyArg_ParseTuple(args, "C", &ch)) return NULL;
if (ch <= 0xffff) chars[0] = (unichar)ch;
else { encode_utf16_pair(ch, chars); count = 2; }
PyObject *ret = (CTFontGetGlyphsForCharacters(self->font, chars, glyphs, count)) ? Py_True : Py_False;
Py_INCREF(ret);
return ret;
}
// Boilerplate {{{
@ -95,6 +118,7 @@ static PyMemberDef members[] = {
};
static PyMethodDef methods[] = {
METHOD(has_char, METH_VARARGS)
{NULL} /* Sentinel */
};