1 /*
2 * Copyright © 2018 Ebrahim Byagowi
3 * Copyright © 2018 Khaled Hosny
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 */
25
26 #include "hb.h"
27 #include "hb-ot.h"
28
29 #include "hb-ft.h"
30
31 #include <ft2build.h>
32 #include FT_FREETYPE_H
33 #include FT_GLYPH_H
34
35 #include <cairo.h>
36 #include <cairo-ft.h>
37 #include <cairo-svg.h>
38
39 #include <stdlib.h>
40 #include <stdio.h>
41
42 static void
svg_dump(hb_face_t * face,unsigned int face_index)43 svg_dump (hb_face_t *face, unsigned int face_index)
44 {
45 unsigned glyph_count = hb_face_get_glyph_count (face);
46
47 for (unsigned int glyph_id = 0; glyph_id < glyph_count; glyph_id++)
48 {
49 hb_blob_t *blob = hb_ot_color_glyph_reference_svg (face, glyph_id);
50
51 if (hb_blob_get_length (blob) == 0) continue;
52
53 unsigned int length;
54 const char *data = hb_blob_get_data (blob, &length);
55
56 char output_path[255];
57 sprintf (output_path, "out/svg-%u-%u.svg%s",
58 glyph_id,
59 face_index,
60 // append "z" if the content is gzipped, https://stackoverflow.com/a/6059405
61 (length > 2 && (data[0] == '\x1F') && (data[1] == '\x8B')) ? "z" : "");
62
63 FILE *f = fopen (output_path, "wb");
64 fwrite (data, 1, length, f);
65 fclose (f);
66
67 hb_blob_destroy (blob);
68 }
69 }
70
71 /* _png API is so easy to use unlike the below code, don't get confused */
72 static void
png_dump(hb_face_t * face,unsigned int face_index)73 png_dump (hb_face_t *face, unsigned int face_index)
74 {
75 unsigned glyph_count = hb_face_get_glyph_count (face);
76 hb_font_t *font = hb_font_create (face);
77
78 /* scans the font for strikes */
79 unsigned int sample_glyph_id;
80 /* we don't care about different strikes for different glyphs at this point */
81 for (sample_glyph_id = 0; sample_glyph_id < glyph_count; sample_glyph_id++)
82 {
83 hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
84 unsigned int blob_length = hb_blob_get_length (blob);
85 hb_blob_destroy (blob);
86 if (blob_length != 0)
87 break;
88 }
89
90 unsigned int upem = hb_face_get_upem (face);
91 unsigned int blob_length = 0;
92 unsigned int strike = 0;
93 for (unsigned int ppem = 1; ppem < upem; ppem++)
94 {
95 hb_font_set_ppem (font, ppem, ppem);
96 hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
97 unsigned int new_blob_length = hb_blob_get_length (blob);
98 hb_blob_destroy (blob);
99 if (new_blob_length != blob_length)
100 {
101 for (unsigned int glyph_id = 0; glyph_id < glyph_count; glyph_id++)
102 {
103 hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph_id);
104
105 if (hb_blob_get_length (blob) == 0) continue;
106
107 unsigned int length;
108 const char *data = hb_blob_get_data (blob, &length);
109
110 char output_path[255];
111 sprintf (output_path, "out/png-%u-%u-%u.png", glyph_id, strike, face_index);
112
113 FILE *f = fopen (output_path, "wb");
114 fwrite (data, 1, length, f);
115 fclose (f);
116
117 hb_blob_destroy (blob);
118 }
119
120 strike++;
121 blob_length = new_blob_length;
122 }
123 }
124
125 hb_font_destroy (font);
126 }
127
128 static void
layered_glyph_dump(hb_face_t * face,cairo_font_face_t * cairo_face,unsigned int face_index)129 layered_glyph_dump (hb_face_t *face, cairo_font_face_t *cairo_face, unsigned int face_index)
130 {
131 unsigned int upem = hb_face_get_upem (face);
132
133 unsigned glyph_count = hb_face_get_glyph_count (face);
134 for (hb_codepoint_t gid = 0; gid < glyph_count; ++gid)
135 {
136 unsigned int num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, NULL, NULL);
137 if (!num_layers)
138 continue;
139
140 hb_ot_color_layer_t *layers = (hb_ot_color_layer_t*) malloc (num_layers * sizeof (hb_ot_color_layer_t));
141
142 hb_ot_color_glyph_get_layers (face, gid, 0, &num_layers, layers);
143 if (num_layers)
144 {
145 // Measure
146 cairo_text_extents_t extents;
147 {
148 cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
149 cairo_t *cr = cairo_create (surface);
150 cairo_set_font_face (cr, cairo_face);
151 cairo_set_font_size (cr, upem);
152
153 cairo_glyph_t *glyphs = (cairo_glyph_t *) calloc (num_layers, sizeof (cairo_glyph_t));
154 for (unsigned int j = 0; j < num_layers; ++j)
155 glyphs[j].index = layers[j].glyph;
156 cairo_glyph_extents (cr, glyphs, num_layers, &extents);
157 free (glyphs);
158 cairo_surface_destroy (surface);
159 cairo_destroy (cr);
160 }
161
162 // Add a slight margin
163 extents.width += extents.width / 10;
164 extents.height += extents.height / 10;
165 extents.x_bearing -= extents.width / 20;
166 extents.y_bearing -= extents.height / 20;
167
168 // Render
169 unsigned int palette_count = hb_ot_color_palette_get_count (face);
170 for (unsigned int palette = 0; palette < palette_count; palette++)
171 {
172 unsigned int num_colors = hb_ot_color_palette_get_colors (face, palette, 0, NULL, NULL);
173 if (!num_colors)
174 continue;
175
176 hb_color_t *colors = (hb_color_t*) calloc (num_colors, sizeof (hb_color_t));
177 hb_ot_color_palette_get_colors (face, palette, 0, &num_colors, colors);
178 if (num_colors)
179 {
180 char output_path[255];
181 sprintf (output_path, "out/colr-%u-%u-%u.svg", gid, palette, face_index);
182
183 cairo_surface_t *surface = cairo_svg_surface_create (output_path, extents.width, extents.height);
184 cairo_t *cr = cairo_create (surface);
185 cairo_set_font_face (cr, cairo_face);
186 cairo_set_font_size (cr, upem);
187
188 for (unsigned int layer = 0; layer < num_layers; ++layer)
189 {
190 hb_color_t color = 0x000000FF;
191 if (layers[layer].color_index != 0xFFFF)
192 color = colors[layers[layer].color_index];
193 cairo_set_source_rgba (cr,
194 hb_color_get_red (color) / 255.,
195 hb_color_get_green (color) / 255.,
196 hb_color_get_blue (color) / 255.,
197 hb_color_get_alpha (color) / 255.);
198
199 cairo_glyph_t glyph;
200 glyph.index = layers[layer].glyph;
201 glyph.x = -extents.x_bearing;
202 glyph.y = -extents.y_bearing;
203 cairo_show_glyphs (cr, &glyph, 1);
204 }
205
206 cairo_surface_destroy (surface);
207 cairo_destroy (cr);
208 }
209 free (colors);
210 }
211 }
212
213 free (layers);
214 }
215 }
216
217 static void
dump_glyphs(cairo_font_face_t * cairo_face,unsigned int upem,unsigned int num_glyphs,unsigned int face_index)218 dump_glyphs (cairo_font_face_t *cairo_face, unsigned int upem,
219 unsigned int num_glyphs, unsigned int face_index)
220 {
221 for (unsigned int i = 0; i < num_glyphs; ++i)
222 {
223 cairo_text_extents_t extents;
224 cairo_glyph_t glyph = {0};
225 glyph.index = i;
226
227 // Measure
228 {
229 cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
230 cairo_t *cr = cairo_create (surface);
231 cairo_set_font_face (cr, cairo_face);
232 cairo_set_font_size (cr, upem);
233
234 cairo_glyph_extents (cr, &glyph, 1, &extents);
235 cairo_surface_destroy (surface);
236 cairo_destroy (cr);
237 }
238
239 // Add a slight margin
240 extents.width += extents.width / 10;
241 extents.height += extents.height / 10;
242 extents.x_bearing -= extents.width / 20;
243 extents.y_bearing -= extents.height / 20;
244
245 // Render
246 {
247 char output_path[255];
248 sprintf (output_path, "out/%u-%u.svg", face_index, i);
249 cairo_surface_t *surface = cairo_svg_surface_create (output_path, extents.width, extents.height);
250 cairo_t *cr = cairo_create (surface);
251 cairo_set_font_face (cr, cairo_face);
252 cairo_set_font_size (cr, upem);
253 glyph.x = -extents.x_bearing;
254 glyph.y = -extents.y_bearing;
255 cairo_show_glyphs (cr, &glyph, 1);
256 cairo_surface_destroy (surface);
257 cairo_destroy (cr);
258 }
259 }
260 }
261
262 int
main(int argc,char ** argv)263 main (int argc, char **argv)
264 {
265 if (argc != 2) {
266 fprintf (stderr, "usage: %s font-file.ttf\n"
267 "run it like `rm -rf out && mkdir out && %s font-file.ttf`\n",
268 argv[0], argv[0]);
269 exit (1);
270 }
271
272
273 FILE *font_name_file = fopen ("out/.dumped_font_name", "r");
274 if (font_name_file != NULL)
275 {
276 fprintf (stderr, "Purge or move ./out folder in order to run a new dump\n");
277 exit (1);
278 }
279
280 font_name_file = fopen ("out/.dumped_font_name", "w");
281 if (font_name_file == NULL)
282 {
283 fprintf (stderr, "./out is not accessible as a folder, create it please\n");
284 exit (1);
285 }
286 fwrite (argv[1], 1, strlen (argv[1]), font_name_file);
287 fclose (font_name_file);
288
289 hb_blob_t *blob = hb_blob_create_from_file (argv[1]);
290 unsigned int num_faces = hb_face_count (blob);
291 if (num_faces == 0)
292 {
293 fprintf (stderr, "error: The file (%s) was corrupted, empty or not found", argv[1]);
294 exit (1);
295 }
296
297 for (unsigned int face_index = 0; face_index < hb_face_count (blob); face_index++)
298 {
299 hb_face_t *face = hb_face_create (blob, face_index);
300 hb_font_t *font = hb_font_create (face);
301
302 if (hb_ot_color_has_png (face)) printf ("Dumping png (cbdt/sbix)...\n");
303 png_dump (face, face_index);
304
305 if (hb_ot_color_has_svg (face)) printf ("Dumping svg...\n");
306 svg_dump (face, face_index);
307
308 cairo_font_face_t *cairo_face;
309 {
310 FT_Library library;
311 FT_Init_FreeType (&library);
312 FT_Face ft_face;
313 FT_New_Face (library, argv[1], 0, &ft_face);
314 cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
315 }
316 if (hb_ot_color_has_layers (face) && hb_ot_color_has_palettes (face))
317 printf ("Dumping layered color glyphs...\n");
318 layered_glyph_dump (face, cairo_face, face_index);
319
320 unsigned int num_glyphs = hb_face_get_glyph_count (face);
321 unsigned int upem = hb_face_get_upem (face);
322
323 // disabled when color font as cairo rendering of NotoColorEmoji is soooo slow
324 if (!hb_ot_color_has_layers (face) &&
325 !hb_ot_color_has_png (face) &&
326 !hb_ot_color_has_svg (face))
327 dump_glyphs (cairo_face, upem, num_glyphs, face_index);
328
329 hb_font_destroy (font);
330 hb_face_destroy (face);
331 }
332
333 hb_blob_destroy (blob);
334
335 return 0;
336 }
337