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[ot-glyph] Redesign the API

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This commit is contained in:
Ebrahim Byagowi 2019-10-20 16:23:27 +03:30
parent b8b3ff1a02
commit 3dcba9f215
3 changed files with 177 additions and 40 deletions
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141
src/hb-ot-glyph.cc
View File

@ -29,29 +29,134 @@
#include "hb-ot.h"
#include "hb-ot-glyf-table.hh"
unsigned int
hb_ot_glyph_get_outline_path (hb_font_t *font,
hb_codepoint_t glyph,
unsigned int start_offset,
unsigned int *points_count /* IN/OUT. May be NULL. */,
hb_ot_glyph_path_point_t *points /* OUT. May be NULL. */)
struct hb_ot_glyph_path_t
{
unsigned int points_to_write = likely (points && points_count) ? *points_count : 0;
if (likely (points_count)) *points_count = 0;
unsigned int all_points_count = 0;
hb_object_header_t header;
const hb_position_t *coords;
unsigned int coords_count;
const uint8_t *commands;
unsigned int commands_count;
void *user_data;
hb_destroy_func_t destroy;
};
hb_ot_glyph_path_t *
hb_ot_glyph_path_empty ()
{
return const_cast<hb_ot_glyph_path_t *> (&Null (hb_ot_glyph_path_t));
}
hb_ot_glyph_path_t *
hb_ot_glyph_create_path (hb_position_t *coords,
unsigned int coords_count,
uint8_t *commands,
unsigned int commands_count,
void *user_data,
hb_destroy_func_t destroy)
{
hb_ot_glyph_path_t *path;
if (!coords_count || !commands_count ||
!(path = hb_object_create<hb_ot_glyph_path_t> ()))
{
if (destroy)
destroy (user_data);
return hb_ot_glyph_path_empty ();
}
path->coords = coords;
path->coords_count = coords_count;
path->commands = commands;
path->commands_count = commands_count;
path->user_data = user_data;
path->destroy = destroy;
return path;
}
const hb_position_t *
hb_ot_glyph_path_get_coords (hb_ot_glyph_path_t *path, unsigned int *count)
{
if (count) *count = path->coords_count;
return path->coords;
}
const uint8_t *
hb_ot_glyph_path_get_commands (hb_ot_glyph_path_t *path, unsigned int *count)
{
if (count) *count = path->commands_count;
return path->commands;
}
hb_ot_glyph_path_t *
hb_ot_glyph_path_reference (hb_ot_glyph_path_t *path)
{
return hb_object_reference (path);
}
void
hb_ot_glyph_path_destroy (hb_ot_glyph_path_t *path)
{
if (!hb_object_destroy (path)) return;
}
struct _hb_ot_glyph_path_vectors
{
hb_vector_t<hb_position_t> *coords;
hb_vector_t<uint8_t> *commands;
bool init ()
{
coords = (hb_vector_t<hb_position_t> *) malloc (sizeof (hb_vector_t<hb_position_t>));
commands = (hb_vector_t<uint8_t> *) malloc (sizeof (hb_vector_t<uint8_t>));
if (unlikely (!coords || !commands))
{
free (coords);
free (commands);
return false;
}
coords->init ();
commands->init ();
return true;
}
void fini ()
{
coords->fini ();
commands->fini ();
}
};
static void
_hb_ot_glyph_free_path_vectors (void *user_data)
{
((_hb_ot_glyph_path_vectors *) user_data)->fini ();
free (user_data);
}
hb_ot_glyph_path_t *
hb_ot_glyph_create_path_from_font (hb_font_t *font, hb_codepoint_t glyph)
{
_hb_ot_glyph_path_vectors *user_data = (_hb_ot_glyph_path_vectors *)
malloc (sizeof (_hb_ot_glyph_path_vectors));
if (unlikely (!user_data->init ())) return hb_ot_glyph_path_empty ();
hb_vector_t<hb_position_t> &coords = *user_data->coords;
hb_vector_t<uint8_t> &commands = *user_data->commands;
font->face->table.glyf->get_path (font, glyph,
[&] (char cmd, float x, float y)
{
all_points_count++;
if (start_offset) { start_offset--; return; }
if (points_to_write)
{
points[*points_count] = {cmd, font->em_scalef_x (x), font->em_scalef_y (y)};
*points_count += 1;
points_to_write--;
}
if (cmd != ' ') commands.push (cmd);
if (cmd == 'Z') return;
coords.push (font->em_scalef_x (x));
coords.push (font->em_scalef_y (y));
});
return all_points_count;
return hb_ot_glyph_create_path (coords.arrayZ, coords.length, commands.arrayZ, commands.length,
user_data, (hb_destroy_func_t) _hb_ot_glyph_free_path_vectors);
}
#endif

38
src/hb-ot-glyph.h
View File

@ -33,19 +33,33 @@
HB_BEGIN_DECLS
typedef struct hb_ot_glyph_path_point_t
{
char cmd;
hb_position_t x;
hb_position_t y;
} hb_ot_glyph_path_point_t;
typedef struct hb_ot_glyph_path_t hb_ot_glyph_path_t;
HB_EXTERN unsigned int
hb_ot_glyph_get_outline_path (hb_font_t *font,
hb_codepoint_t glyph,
unsigned int start_offset,
unsigned int *points_count /* IN/OUT. May be NULL. */,
hb_ot_glyph_path_point_t *points /* OUT. May be NULL. */);
HB_EXTERN hb_ot_glyph_path_t *
hb_ot_glyph_path_empty ();
HB_EXTERN hb_ot_glyph_path_t *
hb_ot_glyph_create_path (hb_position_t *coords,
unsigned int coords_count,
uint8_t *commands,
unsigned int commands_count,
void *user_data,
hb_destroy_func_t destroy);
HB_EXTERN const hb_position_t *
hb_ot_glyph_path_get_coords (hb_ot_glyph_path_t *path, unsigned int *count);
HB_EXTERN const uint8_t *
hb_ot_glyph_path_get_commands (hb_ot_glyph_path_t *path, unsigned int *count);
HB_EXTERN hb_ot_glyph_path_t *
hb_ot_glyph_path_reference (hb_ot_glyph_path_t *path);
HB_EXTERN void
hb_ot_glyph_path_destroy (hb_ot_glyph_path_t *path);
HB_EXTERN hb_ot_glyph_path_t *
hb_ot_glyph_create_path_from_font (hb_font_t *font, hb_codepoint_t glyph);
HB_END_DECLS

38
src/test-ot-glyph.cc
View File

@ -55,26 +55,44 @@ main (int argc, char **argv)
unsigned int glyph_count = hb_face_get_glyph_count (face);
for (unsigned int gid = 0; gid < glyph_count; ++gid)
{
hb_ot_glyph_path_point_t points[200];
unsigned int points_len = 200;
hb_ot_glyph_get_outline_path (font, gid, 0, nullptr, nullptr); /* just to test it */
printf ("gid %d, points count: %d\n", gid, hb_ot_glyph_get_outline_path (font, gid, 0, &points_len, points));
hb_font_extents_t font_extents;
hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
hb_glyph_extents_t extents = {0};
hb_font_get_glyph_extents (font, gid, &extents);
char name[100];
sprintf (name, "%d.svg", gid);
FILE *f = fopen (name, "wb");
int factor = 1;
if (extents.height < 0) factor = -1;
fprintf (f, "<svg xmlns=\"http://www.w3.org/2000/svg\""
" viewBox=\"0 0 %d %d\"><path d=\"", extents.width, extents.height * factor);
for (unsigned i = 0; i < points_len; ++i)
" viewBox=\"%d %d %d %d\"><path d=\"",
extents.x_bearing, 0,
extents.x_bearing + extents.width, font_extents.ascender - font_extents.descender); //-extents.height);
hb_ot_glyph_path_t *path = hb_ot_glyph_create_path_from_font (font, gid);
unsigned int commands_count;
const uint8_t *commands = hb_ot_glyph_path_get_commands (path, &commands_count);
unsigned int coords_count;
const hb_position_t *coords = hb_ot_glyph_path_get_coords (path, &coords_count);
for (unsigned i = 0, j = 0; i < commands_count && j < coords_count; ++i)
{
if (points[i].cmd == 'Z') fprintf (f, "Z");
else fprintf (f, "%c%d,%d", points[i].cmd, points[i].x, (points[i].y + extents.height) * factor);
fprintf (f, "%c", commands[i]);
if (commands[i] == 'Z') continue;
fprintf (f, "%d,%d", coords[j], font_extents.ascender - coords[j + 1]); //extents.y_bearing - points[i].y);
j += 2;
if (commands[i] == 'Q')
{
fprintf (f, " %d,%d", coords[j], font_extents.ascender - coords[j + 1]); //extents.y_bearing - points[i].y);
j += 2;
}
if (commands[i] == 'C')
{
fprintf (f, " %d,%d", coords[j], font_extents.ascender - coords[j + 1]); //extents.y_bearing - points[i].y);
j += 2;
fprintf (f, " %d,%d", coords[j], font_extents.ascender - coords[j + 1]); //extents.y_bearing - points[i].y);
j += 2;
}
}
fprintf (f, "\"/></svg>");
fclose (f);
hb_ot_glyph_path_destroy (path);
}
hb_font_destroy (font);
hb_face_destroy (face);