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[glyph] Don't copy, write directly into result

This commit is contained in:
Ebrahim Byagowi 2019-10-14 15:37:41 +03:30
parent f883c31cce
commit b8b3ff1a02
3 changed files with 30 additions and 27 deletions
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26
src/hb-ot-glyf-table.hh
View File

@ -1042,8 +1042,9 @@ struct glyf
add_gid_and_children (item.glyphIndex, gids_to_retain, depth);
}
template<typename F>
bool
get_path (hb_font_t *font, hb_codepoint_t gid, hb_vector_t<hb_ot_glyph_path_point_t> &path) const
get_path (hb_font_t *font, hb_codepoint_t gid, F f) const
{
contour_point_vector_t all_points;
if (unlikely (!get_points (font, gid, all_points))) return false;
@ -1063,17 +1064,14 @@ struct glyf
contour_point_t *next = &points[contour_start];
if (curr->flag & Glyph::FLAG_ON_CURVE)
path.push ((hb_ot_glyph_path_point_t)
{'M', font->em_scalef_x (curr->x), font->em_scalef_y (curr->y)});
f ('M', curr->x, curr->y);
else
{
if (next->flag & Glyph::FLAG_ON_CURVE)
path.push ((hb_ot_glyph_path_point_t)
{'M', font->em_scalef_x (next->x), font->em_scalef_y (next->y)});
f ('M', next->x, next->y);
else
/* If both first and last points are off-curve, start at their middle. */
path.push ((hb_ot_glyph_path_point_t)
{'M', font->em_scalef_x ((curr->x + next->x) / 2), font->em_scalef_y ((curr->y + next->y) / 2)});
f ('M', (curr->x + next->x) / 2.f, (curr->y + next->y) / 2.f);
}
for (unsigned i = 0; i < contour_length; ++i)
@ -1082,21 +1080,17 @@ struct glyf
next = &points[contour_start + ((i + 1) % contour_length)];
if (curr->flag & Glyph::FLAG_ON_CURVE)
path.push ((hb_ot_glyph_path_point_t)
{'L', font->em_scalef_x (curr->x), font->em_scalef_y (curr->y)}); /* straight line */
f ('L', curr->x, curr->y); /* straight line */
else
{
path.push ((hb_ot_glyph_path_point_t)
{'Q', font->em_scalef_x (curr->x), font->em_scalef_y (curr->y)});
f ('Q', curr->x, curr->y);
if (next->flag & Glyph::FLAG_ON_CURVE)
path.push ((hb_ot_glyph_path_point_t)
{' ', font->em_scalef_x (next->x), font->em_scalef_y (next->y)});
f (' ', next->x, next->y);
else
path.push ((hb_ot_glyph_path_point_t)
{' ', font->em_scalef_x ((curr->x + next->x) / 2), font->em_scalef_y ((curr->y + next->y) / 2)});
f (' ', (curr->x + next->x) / 2.f, (curr->y + next->y) / 2.f);
}
}
path.push ((hb_ot_glyph_path_point_t) {'Z', 0, 0});
f ('Z', 0, 0);
contour_start += contour_length;
}
return true;

25
src/hb-ot-glyph.cc
View File

@ -36,15 +36,22 @@ hb_ot_glyph_get_outline_path (hb_font_t *font,
unsigned int *points_count /* IN/OUT. May be NULL. */,
hb_ot_glyph_path_point_t *points /* OUT. May be NULL. */)
{
hb_vector_t<hb_ot_glyph_path_point_t> path;
font->face->table.glyf->get_path (font, glyph, path);
if (likely (points_count && points))
{
+ path.sub_array (start_offset, points_count)
| hb_sink (hb_array (points, *points_count))
;
}
return path.length;
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;
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--;
}
});
return all_points_count;
}
#endif

6
src/test-ot-glyph.cc
View File

@ -57,7 +57,8 @@ main (int argc, char **argv)
{
hb_ot_glyph_path_point_t points[200];
unsigned int points_len = 200;
printf ("\ngid %d, points count: %d\n", gid, hb_ot_glyph_get_outline_path (font, gid, 0, &points_len, points));
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_glyph_extents_t extents = {0};
hb_font_get_glyph_extents (font, gid, &extents);
char name[100];
@ -68,10 +69,11 @@ main (int argc, char **argv)
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)
{
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, "\"/></svg>");
fclose (f);
}
hb_font_destroy (font);