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[cmap] Implement MacRoman encoding

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For other Mac encodings just map the ASCII range.

Fixes https://github.com/harfbuzz/harfbuzz/issues/4540
This commit is contained in:
Behdad Esfahbod 2024-01-08 12:30:23 -07:00
parent ef289a9e20
commit e0e2b29ea8
2 changed files with 94 additions and 5 deletions
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12
src/hb-algs.hh
View file

@ -1053,6 +1053,18 @@ _hb_cmp_method (const void *pkey, const void *pval, Ts... ds)
return val.cmp (key, ds...);
}
template <typename K, typename V>
static int
_hb_cmp_operator (const void *pkey, const void *pval)
{
const K& key = * (const K*) pkey;
const V& val = * (const V*) pval;
if (key < val) return -1;
if (key > val) return 1;
return 0;
}
template <typename V, typename K, typename ...Ts>
static inline bool
hb_bsearch_impl (unsigned *pos, /* Out */

87
src/hb-ot-cmap-table.hh
View file

@ -41,6 +41,30 @@
namespace OT {
static inline uint8_t unicode_to_macroman (hb_codepoint_t u)
{
uint16_t mapping[] = {
0x00C4, 0x00C5, 0x00C7, 0x00C9, 0x00D1, 0x00D6, 0x00DC, 0x00E1,
0x00E0, 0x00E2, 0x00E4, 0x00E3, 0x00E5, 0x00E7, 0x00E9, 0x00E8,
0x00EA, 0x00EB, 0x00ED, 0x00EC, 0x00EE, 0x00EF, 0x00F1, 0x00F3,
0x00F2, 0x00F4, 0x00F6, 0x00F5, 0x00FA, 0x00F9, 0x00FB, 0x00FC,
0x2020, 0x00B0, 0x00A2, 0x00A3, 0x00A7, 0x2022, 0x00B6, 0x00DF,
0x00AE, 0x00A9, 0x2122, 0x00B4, 0x00A8, 0x2260, 0x00C6, 0x00D8,
0x221E, 0x00B1, 0x2264, 0x2265, 0x00A5, 0x00B5, 0x2202, 0x2211,
0x220F, 0x03C0, 0x222B, 0x00AA, 0x00BA, 0x03A9, 0x00E6, 0x00F8,
0x00BF, 0x00A1, 0x00AC, 0x221A, 0x0192, 0x2248, 0x2206, 0x00AB,
0x00BB, 0x2026, 0x00A0, 0x00C0, 0x00C3, 0x00D5, 0x0152, 0x0153,
0x2013, 0x2014, 0x201C, 0x201D, 0x2018, 0x2019, 0x00F7, 0x25CA,
0x00FF, 0x0178, 0x2044, 0x20AC, 0x2039, 0x203A, 0xFB01, 0xFB02,
0x2021, 0x00B7, 0x201A, 0x201E, 0x2030, 0x00C2, 0x00CA, 0x00C1,
0x00CB, 0x00C8, 0x00CD, 0x00CE, 0x00CF, 0x00CC, 0x00D3, 0x00D4,
0xF8FF, 0x00D2, 0x00DA, 0x00DB, 0x00D9, 0x0131, 0x02C6, 0x02DC,
0x00AF, 0x02D8, 0x02D9, 0x02DA, 0x00B8, 0x02DD, 0x02DB, 0x02C7
};
uint16_t *c = hb_bsearch (u, mapping, ARRAY_LENGTH (mapping), sizeof (mapping[0]),
_hb_cmp_operator<uint16_t, uint16_t>);
return c ? (c - mapping) + 0x7F : 0;
}
struct CmapSubtableFormat0
{
@ -1465,8 +1489,11 @@ struct EncodingRecord
int ret;
ret = platformID.cmp (other.platformID);
if (ret) return ret;
ret = encodingID.cmp (other.encodingID);
if (ret) return ret;
if (other.encodingID != 0xFFFF)
{
ret = encodingID.cmp (other.encodingID);
if (ret) return ret;
}
return 0;
}
@ -1814,9 +1841,13 @@ struct cmap
c->plan));
}
const CmapSubtable *find_best_subtable (bool *symbol = nullptr) const
const CmapSubtable *find_best_subtable (bool *symbol = nullptr,
bool *mac = nullptr,
bool *macroman = nullptr) const
{
if (symbol) *symbol = false;
if (mac) *mac = false;
if (macroman) *macroman = false;
const CmapSubtable *subtable;
@ -1841,6 +1872,20 @@ struct cmap
if ((subtable = this->find_subtable (0, 1))) return subtable;
if ((subtable = this->find_subtable (0, 0))) return subtable;
/* MacRoman subtable. */
if ((subtable = this->find_subtable (1, 0)))
{
if (mac) *mac = true;
if (macroman) *macroman = true;
return subtable;
}
/* Any other Mac subtable; we just map ASCII for these. */
if ((subtable = this->find_subtable (1, 0xFFFF)))
{
if (mac) *mac = true;
return subtable;
}
/* Meh. */
return &Null (CmapSubtable);
}
@ -1852,8 +1897,8 @@ struct cmap
accelerator_t (hb_face_t *face)
{
this->table = hb_sanitize_context_t ().reference_table<cmap> (face);
bool symbol;
this->subtable = table->find_best_subtable (&symbol);
bool symbol, mac, macroman;
this->subtable = table->find_best_subtable (&symbol, &mac, &macroman);
this->subtable_uvs = &Null (CmapSubtableFormat14);
{
const CmapSubtable *st = table->find_subtable (0, 5);
@ -1862,6 +1907,7 @@ struct cmap
}
this->get_glyph_data = subtable;
#ifndef HB_NO_CMAP_LEGACY_SUBTABLES
if (unlikely (symbol))
{
switch ((unsigned) face->table.OS2->get_font_page ()) {
@ -1881,7 +1927,16 @@ struct cmap
break;
}
}
else if (unlikely (macroman))
{
this->get_glyph_funcZ = get_glyph_from_macroman<CmapSubtable>;
}
else if (unlikely (mac))
{
this->get_glyph_funcZ = get_glyph_from_ascii<CmapSubtable>;
}
else
#endif
{
switch (subtable->u.format) {
/* Accelerate format 4 and format 12. */
@ -2006,6 +2061,28 @@ struct cmap
return false;
}
template <typename Type>
HB_INTERNAL static bool get_glyph_from_ascii (const void *obj,
hb_codepoint_t codepoint,
hb_codepoint_t *glyph)
{
const Type *typed_obj = (const Type *) obj;
return codepoint < 0x80 && typed_obj->get_glyph (codepoint, glyph);
}
template <typename Type>
HB_INTERNAL static bool get_glyph_from_macroman (const void *obj,
hb_codepoint_t codepoint,
hb_codepoint_t *glyph)
{
if (get_glyph_from_ascii<Type> (obj, codepoint, glyph))
return true;
const Type *typed_obj = (const Type *) obj;
unsigned c = unicode_to_macroman (codepoint);
return c && typed_obj->get_glyph (c, glyph);
}
private:
hb_nonnull_ptr_t<const CmapSubtable> subtable;
hb_nonnull_ptr_t<const CmapSubtableFormat14> subtable_uvs;