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Ensure that harfbuzz always uses the OpenType shaper

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This commit is contained in:
Kovid Goyal 2017-11-11 18:25:25 +05:30
parent e5d411b80d
commit c56a2ed055
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 13 additions and 2 deletions
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15
kitty/fonts.c
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@ -473,16 +473,18 @@ next_group(unsigned int *num_group_cells, unsigned int *num_group_glyphs, Cell *
*num_group_glyphs = MAX(1, MIN(*num_group_glyphs, num_glyphs));
}
static const char* SHAPERS[] = {"ot", NULL};
static inline void
shape_run(Cell *first_cell, index_type num_cells, Font *font) {
load_hb_buffer(first_cell, num_cells);
hb_shape(font->hb_font, harfbuzz_buffer, NULL, 0);
hb_shape_full(font->hb_font, harfbuzz_buffer, NULL, 0, SHAPERS);
unsigned int info_length, positions_length, num_glyphs;
hb_glyph_info_t *info = hb_buffer_get_glyph_infos(harfbuzz_buffer, &info_length);
hb_glyph_position_t *positions = hb_buffer_get_glyph_positions(harfbuzz_buffer, &positions_length);
num_glyphs = MIN(info_length, positions_length);
#if 0
// You can also generate this easily using hb-shape --show-flags --show-extents --cluster-level=1 /path/to/font/file text
// You can also generate this easily using hb-shape --show-flags --show-extents --cluster-level=1 --shapers=ot /path/to/font/file text
hb_buffer_serialize_glyphs(harfbuzz_buffer, 0, num_glyphs, (char*)canvas, 4 * cell_width * cell_height, NULL, font->hb_font, HB_BUFFER_SERIALIZE_FORMAT_TEXT, HB_BUFFER_SERIALIZE_FLAG_DEFAULT | HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS | HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS);
printf("\n%s\n", canvas);
clear_canvas();
@ -743,5 +745,14 @@ init_fonts(PyObject *module) {
if (PyModule_AddFunctions(module, module_methods) != 0) return false;
current_send_sprite_to_gpu = send_sprite_to_gpu;
sprite_tracker_set_limits(2000, 2000);
const char** shapers = hb_shape_list_shapers();
bool found = false;
for(int i = 0; shapers[i] != NULL && !found; i++) {
if (strcmp(shapers[i], "ot") == 0) found = true;
}
if (!found) {
PyErr_SetString(PyExc_RuntimeError, "The harfbuzz library on your system does not support the OpenType shaper");
return false;
}
return true;
}