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[ot-font] Implement hb_ot_get_glyph_from_name

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This commit is contained in:
Khaled Hosny 2017-10-18 20:49:16 +02:00 committed by Behdad Esfahbod
parent 9d4d2fb9af
commit d9e166f74c
2 changed files with 79 additions and 1 deletions
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22
src/hb-ot-font.cc
View File

@ -327,6 +327,15 @@ struct hb_ot_face_post_accelerator_t
return this->post->get_glyph_name (glyph, name, size, this->post_len);
}
inline bool get_glyph_from_name (const char *name, int len,
hb_codepoint_t *glyph) const
{
if (unlikely (!name) || unlikely(!len))
return false;
return this->post->get_glyph_from_name (name, len, glyph, this->post_len);
}
};
typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj,
@ -577,6 +586,17 @@ hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
return ot_font->post->get_glyph_name (glyph, name, size);
}
static hb_bool_t
hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
void *font_data,
const char *name, int len,
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
return ot_font->post->get_glyph_from_name (name, len, glyph);
}
static hb_bool_t
hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
void *font_data,
@ -638,7 +658,7 @@ retry:
hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
//hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr); TODO
hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
//hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr); TODO
hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
hb_font_funcs_make_immutable (funcs);

58
src/hb-ot-post-table.hh
View File

@ -173,6 +173,64 @@ struct post
return false;
}
inline bool get_glyph_from_name (const char *name, int len,
hb_codepoint_t *glyph,
unsigned int blob_len) const
{
if (len < 0)
len = strlen (name);
if (version.to_int () == 0x00010000)
{
for (int i = 0; i < NUM_FORMAT1_NAMES; i++)
{
if (strncmp (name, format1_names[i], len) == 0)
{
*glyph = i;
return true;
}
}
return false;
}
if (version.to_int () == 0x00020000)
{
const postV2Tail &v2 = StructAfter<postV2Tail>(*this);
unsigned int offset = min_size + v2.min_size + 2 * v2.numberOfGlyphs;
char* data = (char*) this + offset;
for (hb_codepoint_t gid = 0; gid < v2.numberOfGlyphs; gid++)
{
unsigned int index = v2.glyphNameIndex[gid];
if (index >= NUM_FORMAT1_NAMES)
{
for (unsigned int i = 0; data < (char*) this + blob_len; i++)
{
unsigned int name_length = data[0];
unsigned int remaining = (char*) this + blob_len - data - 1;
name_length = MIN (name_length, remaining);
if (name_length == len && strncmp (name, data + 1, len) == 0)
{
*glyph = gid;
return true;
}
data += name_length + 1;
}
return false;
}
else if (strncmp (name, format1_names[index], len) == 0)
{
*glyph = gid;
return true;
}
}
return false;
}
return false;
}
public:
FixedVersion<>version; /* 0x00010000 for version 1.0
* 0x00020000 for version 2.0