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[subset] Add hb-subset.h API for retrieving the raw per glyph outline data from CFF and CFF2.

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This commit is contained in:
Garret Rieger 2025-03-27 18:45:12 +00:00
parent ba6869848f
commit 0d4053b11d
5 changed files with 120 additions and 0 deletions
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1
docs/harfbuzz-sections.txt
View file

@ -955,6 +955,7 @@ hb_subset_serialize_object_t
hb_subset_serialize_or_fail
<SUBSECTION Private>
hb_subset_input_override_name_table
hb_subset_cff_get_charstring_data
</SECTION>
<SECTION>

1
src/gen-def.py
View file

@ -21,6 +21,7 @@ if '--experimental-api' not in sys.argv:
experimental_symbols = \
"""hb_shape_justify
hb_subset_input_override_name_table
hb_subset_cff_get_charstring_data
""".splitlines ()
symbols = [x for x in symbols if x not in experimental_symbols]
symbols = "\n".join (symbols)

31
src/hb-subset.cc
View file

@ -708,3 +708,34 @@ hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan)
end:
return success ? hb_face_reference (plan->dest) : nullptr;
}
#ifdef HB_EXPERIMENTAL_API
#include "hb-ot-cff1-table.hh"
/**
* hb_subset_cff_get_charstring_data:
* @face: A face object
* @glyph_index: Glyph index to get data for.
*
* Returns the raw outline data from the CFF/CFF2 table associated with the given glyph index.
*
* XSince: EXPERIMENTAL
**/
HB_EXTERN hb_blob_t*
hb_subset_cff_get_charstring_data(hb_face_t* face, hb_codepoint_t glyph_index) {
hb_ubytes_t bytes;
if (_is_table_present(face, HB_TAG('C', 'F', 'F', ' '))) {
bytes = (*face->table.cff1->charStrings)[glyph_index];
} else if (_is_table_present(face, HB_TAG('C', 'F', 'F', '2'))) {
bytes = (*face->table.cff2->charStrings)[glyph_index];
}
if (!bytes) {
return hb_blob_get_empty ();
}
return hb_blob_create((const char*) bytes.arrayZ, bytes.length, HB_MEMORY_MODE_READONLY, nullptr, nullptr);
}
#endif

8
src/hb-subset.h
View file

@ -224,6 +224,14 @@ hb_subset_input_override_name_table (hb_subset_input_t *input,
unsigned language_id,
const char *name_str,
int str_len);
/*
* Raw outline data access
*/
HB_EXTERN hb_blob_t*
hb_subset_cff_get_charstring_data(hb_face_t* face, hb_codepoint_t glyph_index);
#endif
HB_EXTERN hb_face_t *

79
test/api/test-subset.c
View file

@ -228,6 +228,80 @@ test_subset_create_for_tables_face (void)
hb_face_destroy (face_ac);
}
#ifdef HB_EXPERIMENTAL_API
static void
test_subset_cff_get_charstring_data (void)
{
const uint8_t CFF2[226] = {
// From https://learn.microsoft.com/en-us/typography/opentype/spec/cff2
0x02, 0x00, 0x05, 0x00, 0x07, 0xCF, 0x0C, 0x24, 0xC3, 0x11, 0x9B, 0x18, 0x00, 0x00, 0x00, 0x00,
0x00, 0x26, 0x00, 0x01, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x01, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x01,
0x00, 0x02, 0xC0, 0x00, 0xE0, 0x00, 0x00, 0x00, 0xC0, 0x00, 0xC0, 0x00, 0xE0, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x01, 0x01, 0x03, 0x05,
0x20, 0x0A, 0x20, 0x0A, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x05, 0xF7, 0x06, 0xDA, 0x12, 0x77,
0x9F, 0xF8, 0x6C, 0x9D, 0xAE, 0x9A, 0xF4, 0x9A, 0x95, 0x9F, 0xB3, 0x9F, 0x8B, 0x8B, 0x8B, 0x8B,
0x85, 0x9A, 0x8B, 0x8B, 0x97, 0x73, 0x8B, 0x8B, 0x8C, 0x80, 0x8B, 0x8B, 0x8B, 0x8D, 0x8B, 0x8B,
0x8C, 0x8A, 0x8B, 0x8B, 0x97, 0x17, 0x06, 0xFB, 0x8E, 0x95, 0x86, 0x9D, 0x8B, 0x8B, 0x8D, 0x17,
0x07, 0x77, 0x9F, 0xF8, 0x6D, 0x9D, 0xAD, 0x9A, 0xF3, 0x9A, 0x95, 0x9F, 0xB3, 0x9F, 0x08, 0xFB,
0x8D, 0x95, 0x09, 0x1E, 0xA0, 0x37, 0x5F, 0x0C, 0x09, 0x8B, 0x0C, 0x0B, 0xC2, 0x6E, 0x9E, 0x8C,
0x17, 0x0A, 0xDB, 0x57, 0xF7, 0x02, 0x8C, 0x17, 0x0B, 0xB3, 0x9A, 0x77, 0x9F, 0x82, 0x8A, 0x8D,
0x17, 0x0C, 0x0C, 0xDB, 0x95, 0x57, 0xF7, 0x02, 0x85, 0x8B, 0x8D, 0x17, 0x0C, 0x0D, 0xF7, 0x06,
0x13, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x1B, 0xBD, 0xBD, 0xEF, 0x8C, 0x10, 0x8B, 0x15, 0xF8,
0x88, 0x27, 0xFB, 0x5C, 0x8C, 0x10, 0x06, 0xF8, 0x88, 0x07, 0xFC, 0x88, 0xEF, 0xF7, 0x5C, 0x8C,
0x10, 0x06
};
hb_blob_t* cff2 = hb_blob_create ((const char*) CFF2, 226, HB_MEMORY_MODE_READONLY, 0, 0);
hb_face_t* builder = hb_face_builder_create ();
hb_face_builder_add_table (builder, HB_TAG('C', 'F', 'F', '2'), cff2);
hb_blob_t* face_blob = hb_face_reference_blob (builder);
hb_face_t* face = hb_face_create (face_blob, 0);
hb_blob_t* cs0 = hb_subset_cff_get_charstring_data (face, 0);
unsigned int length;
const uint8_t* data = (const uint8_t*) hb_blob_get_data (cs0, &length);
g_assert (length == 2);
g_assert (data[0] == 0x20);
g_assert (data[1] == 0x0A);
hb_blob_t* cs1 = hb_subset_cff_get_charstring_data (face, 1);
data = (const uint8_t*) hb_blob_get_data (cs1, &length);
g_assert (length == 2);
g_assert (data[0] == 0x20);
g_assert (data[1] == 0x0A);
hb_blob_t* cs2 = hb_subset_cff_get_charstring_data (face, 2);
data = (const uint8_t*) hb_blob_get_data (cs2, &length);
g_assert (length == 0);
hb_blob_destroy (cff2);
hb_face_destroy (builder);
hb_blob_destroy (face_blob);
hb_face_destroy (face);
hb_blob_destroy (cs0);
hb_blob_destroy (cs1);
hb_blob_destroy (cs2);
}
static void
test_subset_cff_get_charstring_data_no_cff (void)
{
hb_face_t* builder = hb_face_builder_create ();
hb_blob_t* face_blob = hb_face_reference_blob (builder);
hb_face_t* face = hb_face_create (face_blob, 0);
hb_blob_t* cs0 = hb_subset_cff_get_charstring_data (face, 0);
unsigned int length;
const uint8_t* data = (const uint8_t*) hb_blob_get_data (cs0, &length);
g_assert (length == 0);
hb_face_destroy (builder);
hb_blob_destroy (face_blob);
hb_face_destroy (face);
hb_blob_destroy (cs0);
}
#endif
int
main (int argc, char **argv)
{
@ -241,5 +315,10 @@ main (int argc, char **argv)
hb_test_add (test_subset_plan);
hb_test_add (test_subset_create_for_tables_face);
#ifdef HB_EXPERIMENTAL_API
hb_test_add (test_subset_cff_get_charstring_data);
hb_test_add (test_subset_cff_get_charstring_data_no_cff);
#endif
return hb_test_run();
}