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Show U+FFFD REPLACEMENT CHARACTER for invalid Unicode codepoints 

Only if the font doesn't support it.  Ie, this gives the user to
use non-Unicode codepoints as private values and return a meaningful
glyph for them.  But if it's invalid and font callback doesn't
like it, and if font has U+FFFD, show that instead.

Font functions that do not want this automatic replacement to
happen should return true from get_glyph() if unicode > 0x10FFFF.

Replaces https://github.com/behdad/harfbuzz/pull/27
This commit is contained in:
Behdad Esfahbod 2014-07-11 11:59:48 -04:00
parent 6f13b6d62d
commit efe74214bb
1 changed files with 7 additions and 0 deletions
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7
src/hb-ot-shape-normalize.cc
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@ -209,7 +209,14 @@ decompose_current_character (const hb_ot_shape_normalize_context_t *c, bool shor
else if (decompose_compatibility (c, buffer->cur().codepoint))
skip_char (buffer);
else
{
/* Not found, not decomposible; If codepoint is invalid Unicode and
* font supports U+FFFD REPLACEMENT CHARACTER, use that instead. */
hb_codepoint_t FFFD_glyph;
if (buffer->cur().codepoint > 0x10FFFF && c->font->get_glyph (0xFFFD, 0, &FFFD_glyph))
glyph = FFFD_glyph;
next_char (buffer, glyph); /* glyph is initialized in earlier branches. */
}
}
static inline void