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harfbuzz/src/main.cc

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/*
* Copyright © 2007,2008,2009 Red Hat, Inc.
* Copyright © 2018,2019,2020 Ebrahim Byagowi
* Copyright © 2018 Khaled Hosny
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "hb.h"
#include "hb-ot.h"
#include <cassert>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#ifdef HB_NO_OPEN
#define hb_blob_create_from_file_or_fail(x) hb_blob_get_empty ()
#endif
#if !defined(HB_NO_COLOR) && !defined(HB_NO_DRAW)
static void
svg_dump (hb_face_t *face, unsigned face_index)
{
unsigned glyph_count = hb_face_get_glyph_count (face);
for (unsigned glyph_id = 0; glyph_id < glyph_count; ++glyph_id)
{
hb_blob_t *blob = hb_ot_color_glyph_reference_svg (face, glyph_id);
if (hb_blob_get_length (blob) == 0) continue;
unsigned length;
const char *data = hb_blob_get_data (blob, &length);
char output_path[255];
sprintf (output_path, "out/svg-%u-%u.svg%s",
glyph_id,
face_index,
// append "z" if the content is gzipped, https://stackoverflow.com/a/6059405
(length > 2 && (data[0] == '\x1F') && (data[1] == '\x8B')) ? "z" : "");
FILE *f = fopen (output_path, "wb");
fwrite (data, 1, length, f);
fclose (f);
hb_blob_destroy (blob);
}
}
/* _png API is so easy to use unlike the below code, don't get confused */
static void
png_dump (hb_face_t *face, unsigned face_index)
{
unsigned glyph_count = hb_face_get_glyph_count (face);
hb_font_t *font = hb_font_create (face);
/* scans the font for strikes */
unsigned sample_glyph_id;
/* we don't care about different strikes for different glyphs at this point */
for (sample_glyph_id = 0; sample_glyph_id < glyph_count; ++sample_glyph_id)
{
hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
unsigned blob_length = hb_blob_get_length (blob);
hb_blob_destroy (blob);
if (blob_length != 0)
break;
}
unsigned upem = hb_face_get_upem (face);
unsigned blob_length = 0;
unsigned strike = 0;
for (unsigned ppem = 1; ppem < upem; ++ppem)
{
hb_font_set_ppem (font, ppem, ppem);
hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
unsigned new_blob_length = hb_blob_get_length (blob);
hb_blob_destroy (blob);
if (new_blob_length != blob_length)
{
for (unsigned glyph_id = 0; glyph_id < glyph_count; ++glyph_id)
{
hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph_id);
if (hb_blob_get_length (blob) == 0) continue;
unsigned length;
const char *data = hb_blob_get_data (blob, &length);
char output_path[255];
sprintf (output_path, "out/png-%u-%u-%u.png", glyph_id, strike, face_index);
FILE *f = fopen (output_path, "wb");
fwrite (data, 1, length, f);
fclose (f);
hb_blob_destroy (blob);
}
strike++;
blob_length = new_blob_length;
}
}
hb_font_destroy (font);
}
struct draw_data_t
{
FILE *f;
hb_position_t ascender;
};
static void
move_to (hb_draw_funcs_t *, draw_data_t *draw_data,
hb_draw_state_t *,
float to_x, float to_y,
void *)
{
fprintf (draw_data->f, "M%g,%g", to_x, draw_data->ascender - to_y);
}
static void
line_to (hb_draw_funcs_t *, draw_data_t *draw_data,
hb_draw_state_t *,
float to_x, float to_y,
void *)
{
fprintf (draw_data->f, "L%g,%g", to_x, draw_data->ascender - to_y);
}
static void
quadratic_to (hb_draw_funcs_t *, draw_data_t *draw_data,
hb_draw_state_t *,
float control_x, float control_y,
float to_x, float to_y,
void *)
{
fprintf (draw_data->f, "Q%g,%g %g,%g", control_x, draw_data->ascender - control_y,
to_x, draw_data->ascender - to_y);
}
static void
cubic_to (hb_draw_funcs_t *, draw_data_t *draw_data,
hb_draw_state_t *,
float control1_x, float control1_y,
float control2_x, float control2_y,
float to_x, float to_y,
void *)
{
fprintf (draw_data->f, "C%g,%g %g,%g %g,%g", control1_x, draw_data->ascender - control1_y,
control2_x, draw_data->ascender - control2_y,
to_x, draw_data->ascender - to_y);
}
static void
close_path (hb_draw_funcs_t *, draw_data_t *draw_data,
hb_draw_state_t *,
void *)
{
fprintf (draw_data->f, "Z");
}
static void
layered_glyph_dump (hb_font_t *font, hb_draw_funcs_t *funcs, unsigned face_index)
{
hb_face_t *face = hb_font_get_face (font);
unsigned palette_count = hb_ot_color_palette_get_count (face);
for (unsigned palette = 0; palette < palette_count; ++palette)
{
unsigned num_colors = hb_ot_color_palette_get_colors (face, palette, 0, nullptr, nullptr);
if (!num_colors) continue;
hb_color_t *colors = (hb_color_t*) calloc (num_colors, sizeof (hb_color_t));
hb_ot_color_palette_get_colors (face, palette, 0, &num_colors, colors);
if (!num_colors)
{
free (colors);
continue;
}
unsigned num_glyphs = hb_face_get_glyph_count (face);
for (hb_codepoint_t gid = 0; gid < num_glyphs; ++gid)
{
unsigned num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, nullptr, nullptr);
if (!num_layers) continue;
hb_ot_color_layer_t *layers = (hb_ot_color_layer_t*) malloc (num_layers * sizeof (hb_ot_color_layer_t));
hb_ot_color_glyph_get_layers (face, gid, 0, &num_layers, layers);
if (num_layers)
{
hb_font_extents_t font_extents;
hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
hb_glyph_extents_t extents = {0};
if (!hb_font_get_glyph_extents (font, gid, &extents))
{
printf ("Skip gid: %d\n", gid);
continue;
}
char output_path[255];
sprintf (output_path, "out/colr-%u-%u-%u.svg", gid, palette, face_index);
FILE *f = fopen (output_path, "wb");
fprintf (f, "<svg xmlns=\"http://www.w3.org/2000/svg\""
" viewBox=\"%d %d %d %d\">\n",
extents.x_bearing, 0,
extents.x_bearing + extents.width, -extents.height);
draw_data_t draw_data;
draw_data.ascender = extents.y_bearing;
draw_data.f = f;
for (unsigned layer = 0; layer < num_layers; ++layer)
{
hb_color_t color = 0x000000FF;
if (layers[layer].color_index != 0xFFFF)
color = colors[layers[layer].color_index];
fprintf (f, "<path fill=\"#%02X%02X%02X\" ",
hb_color_get_red (color), hb_color_get_green (color), hb_color_get_green (color));
if (hb_color_get_alpha (color) != 255)
fprintf (f, "fill-opacity=\"%.3f\"", (double) hb_color_get_alpha (color) / 255.);
fprintf (f, "d=\"");
hb_font_get_glyph_shape (font, layers[layer].glyph, funcs, &draw_data);
fprintf (f, "\"/>\n");
}
fprintf (f, "</svg>");
fclose (f);
}
free (layers);
}
free (colors);
}
}
static void
dump_glyphs (hb_font_t *font, hb_draw_funcs_t *funcs, unsigned face_index)
{
unsigned num_glyphs = hb_face_get_glyph_count (hb_font_get_face (font));
for (unsigned gid = 0; gid < num_glyphs; ++gid)
{
hb_font_extents_t font_extents;
hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
hb_glyph_extents_t extents = {0};
if (!hb_font_get_glyph_extents (font, gid, &extents))
{
printf ("Skip gid: %d\n", gid);
continue;
}
char output_path[255];
sprintf (output_path, "out/%u-%u.svg", face_index, gid);
FILE *f = fopen (output_path, "wb");
fprintf (f, "<svg xmlns=\"http://www.w3.org/2000/svg\""
" viewBox=\"%d %d %d %d\"><path d=\"",
extents.x_bearing, 0,
extents.x_bearing + extents.width, font_extents.ascender - font_extents.descender);
draw_data_t draw_data;
draw_data.ascender = font_extents.ascender;
draw_data.f = f;
hb_font_get_glyph_shape (font, gid, funcs, &draw_data);
fprintf (f, "\"/></svg>");
fclose (f);
}
}
static void
dump_glyphs (hb_blob_t *blob, const char *font_name)
{
FILE *font_name_file = fopen ("out/.dumped_font_name", "r");
if (font_name_file)
{
fprintf (stderr, "Purge or rename ./out folder if you like to run a glyph dump,\n"
"run it like `rm -rf out && mkdir out && src/main font-file.ttf`\n");
return;
}
font_name_file = fopen ("out/.dumped_font_name", "w");
if (!font_name_file)
{
fprintf (stderr, "./out is not accessible as a folder, create it please\n");
return;
}
fwrite (font_name, 1, strlen (font_name), font_name_file);
fclose (font_name_file);
hb_draw_funcs_t *funcs = hb_draw_funcs_create ();
hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, nullptr, nullptr);
hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, nullptr, nullptr);
hb_draw_funcs_set_quadratic_to_func (funcs, (hb_draw_quadratic_to_func_t) quadratic_to, nullptr, nullptr);
hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, nullptr, nullptr);
hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, nullptr, nullptr);
unsigned num_faces = hb_face_count (blob);
for (unsigned face_index = 0; face_index < num_faces; ++face_index)
{
hb_face_t *face = hb_face_create (blob, face_index);
hb_font_t *font = hb_font_create (face);
if (hb_ot_color_has_png (face))
printf ("Dumping png (CBDT/sbix)...\n");
png_dump (face, face_index);
if (hb_ot_color_has_svg (face))
printf ("Dumping svg (SVG )...\n");
svg_dump (face, face_index);
if (hb_ot_color_has_layers (face) && hb_ot_color_has_palettes (face))
printf ("Dumping layered color glyphs (COLR/CPAL)...\n");
layered_glyph_dump (font, funcs, face_index);
dump_glyphs (font, funcs, face_index);
hb_font_destroy (font);
hb_face_destroy (face);
}
hb_draw_funcs_destroy (funcs);
}
#endif
#ifndef MAIN_CC_NO_PRIVATE_API
/* Only this part of this mini app uses private API */
#include "hb-static.cc"
#include "hb-open-file.hh"
#include "hb-ot-layout-gdef-table.hh"
#include "hb-ot-layout-gsubgpos.hh"
using namespace OT;
static void
print_layout_info_using_private_api (hb_blob_t *blob)
{
const char *font_data = hb_blob_get_data (blob, nullptr);
hb_blob_t *font_blob = hb_sanitize_context_t ().sanitize_blob<OpenTypeFontFile> (blob);
const OpenTypeFontFile* sanitized = font_blob->as<OpenTypeFontFile> ();
if (!font_blob->data)
{
printf ("Sanitization of the file wasn't successful. Exit");
exit (1);
}
const OpenTypeFontFile& ot = *sanitized;
switch (ot.get_tag ())
{
case OpenTypeFontFile::TrueTypeTag:
printf ("OpenType font with TrueType outlines\n");
break;
case OpenTypeFontFile::CFFTag:
printf ("OpenType font with CFF (Type1) outlines\n");
break;
case OpenTypeFontFile::TTCTag:
printf ("TrueType Collection of OpenType fonts\n");
break;
case OpenTypeFontFile::TrueTag:
printf ("Obsolete Apple TrueType font\n");
break;
case OpenTypeFontFile::Typ1Tag:
printf ("Obsolete Apple Type1 font in SFNT container\n");
break;
case OpenTypeFontFile::DFontTag:
printf ("DFont Mac Resource Fork\n");
break;
default:
printf ("Unknown font format\n");
break;
}
unsigned num_faces = hb_face_count (blob);
printf ("%d font(s) found in file\n", num_faces);
for (unsigned n_font = 0; n_font < num_faces; ++n_font)
{
const OpenTypeFontFace &font = ot.get_face (n_font);
printf ("Font %d of %d:\n", n_font, num_faces);
unsigned num_tables = font.get_table_count ();
printf (" %d table(s) found in font\n", num_tables);
for (unsigned n_table = 0; n_table < num_tables; ++n_table)
{
const OpenTypeTable &table = font.get_table (n_table);
printf (" Table %2d of %2d: %.4s (0x%08x+0x%08x)\n", n_table, num_tables,
(const char *) table.tag,
(unsigned) table.offset,
(unsigned) table.length);
switch (table.tag)
{
case HB_OT_TAG_GSUB:
case HB_OT_TAG_GPOS:
{
const GSUBGPOS &g = *reinterpret_cast<const GSUBGPOS *> (font_data + table.offset);
unsigned num_scripts = g.get_script_count ();
printf (" %d script(s) found in table\n", num_scripts);
for (unsigned n_script = 0; n_script < num_scripts; ++n_script)
{
const Script &script = g.get_script (n_script);
printf (" Script %2d of %2d: %.4s\n", n_script, num_scripts,
(const char *) g.get_script_tag (n_script));
if (!script.has_default_lang_sys ())
printf (" No default language system\n");
int num_langsys = script.get_lang_sys_count ();
printf (" %d language system(s) found in script\n", num_langsys);
for (int n_langsys = script.has_default_lang_sys () ? -1 : 0; n_langsys < num_langsys; ++n_langsys)
{
const LangSys &langsys = n_langsys == -1
? script.get_default_lang_sys ()
: script.get_lang_sys (n_langsys);
if (n_langsys == -1)
printf (" Default Language System\n");
else
printf (" Language System %2d of %2d: %.4s\n", n_langsys, num_langsys,
(const char *) script.get_lang_sys_tag (n_langsys));
if (!langsys.has_required_feature ())
printf (" No required feature\n");
else
printf (" Required feature index: %d\n",
langsys.get_required_feature_index ());
unsigned num_features = langsys.get_feature_count ();
printf (" %d feature(s) found in language system\n", num_features);
for (unsigned n_feature = 0; n_feature < num_features; ++n_feature)
{
printf (" Feature index %2d of %2d: %d\n", n_feature, num_features,
langsys.get_feature_index (n_feature));
}
}
}
unsigned num_features = g.get_feature_count ();
printf (" %d feature(s) found in table\n", num_features);
for (unsigned n_feature = 0; n_feature < num_features; ++n_feature)
{
const Feature &feature = g.get_feature (n_feature);
unsigned num_lookups = feature.get_lookup_count ();
printf (" Feature %2d of %2d: %c%c%c%c\n", n_feature, num_features,
HB_UNTAG (g.get_feature_tag (n_feature)));
printf (" %d lookup(s) found in feature\n", num_lookups);
for (unsigned n_lookup = 0; n_lookup < num_lookups; ++n_lookup) {
printf (" Lookup index %2d of %2d: %d\n", n_lookup, num_lookups,
feature.get_lookup_index (n_lookup));
}
}
unsigned num_lookups = g.get_lookup_count ();
printf (" %d lookup(s) found in table\n", num_lookups);
for (unsigned n_lookup = 0; n_lookup < num_lookups; ++n_lookup)
{
const Lookup &lookup = g.get_lookup (n_lookup);
printf (" Lookup %2d of %2d: type %d, props 0x%04X\n", n_lookup, num_lookups,
lookup.get_type (), lookup.get_props ());
}
}
break;
case GDEF::tableTag:
{
const GDEF &gdef = *reinterpret_cast<const GDEF *> (font_data + table.offset);
printf (" Has %sglyph classes\n",
gdef.has_glyph_classes () ? "" : "no ");
printf (" Has %smark attachment types\n",
gdef.has_mark_attachment_types () ? "" : "no ");
printf (" Has %sattach list\n",
gdef.has_attach_list () ? "" : "no ");
printf (" Has %slig carets\n",
gdef.has_lig_carets () ? "" : "no ");
printf (" Has %smark glyph sets\n",
gdef.has_mark_glyph_sets () ? "" : "no ");
break;
}
}
}
}
}
/* end of private API use */
#endif
int
main (int argc, char **argv)
{
if (argc != 2)
{
fprintf (stderr, "usage: %s font-file.ttf\n", argv[0]);
exit (1);
}
hb_blob_t *blob = hb_blob_create_from_file_or_fail (argv[1]);
assert (blob);
printf ("Opened font file %s: %d bytes long\n", argv[1], hb_blob_get_length (blob));
#ifndef MAIN_CC_NO_PRIVATE_API
print_layout_info_using_private_api (blob);
#endif
#if !defined(HB_NO_COLOR) && !defined(HB_NO_DRAW)
dump_glyphs (blob, argv[1]);
#endif
hb_blob_destroy (blob);
return 0;
}
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