2 * Copyright © 2010 Behdad Esfahbod
3 * Copyright © 2011 Google, Inc.
5 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
25 * Google Author(s): Behdad Esfahbod
48 /* Controlled by cmd-line options */
49 static int margin_t = 10;
50 static int margin_b = 10;
51 static int margin_l = 10;
52 static int margin_r = 10;
53 static int line_space = 0;
54 static double font_size = 18;
55 static const char *fore = "#000000";
56 static const char *back = "#ffffff";
57 static const char *text = NULL;
58 static const char *font_file = NULL;
59 static const char *out_file = "/dev/stdout";
60 static const char *language = NULL;
61 static const char *script = NULL;
62 static hb_feature_t *features = NULL;
63 static unsigned int num_features;
64 static hb_bool_t debug = FALSE;
66 /* Ugh, global vars. Ugly, but does the job */
68 static int height = 0;
69 static cairo_surface_t *surface = NULL;
70 static cairo_pattern_t *fore_pattern = NULL;
71 static cairo_pattern_t *back_pattern = NULL;
72 static FT_Library ft_library;
73 static FT_Face ft_face;
74 static cairo_font_face_t *cairo_face;
77 G_GNUC_NORETURN static void
78 usage (FILE *f, int status)
80 fprintf (f, "usage: hb-view [OPTS...] font-file text\n");
84 G_GNUC_NORETURN static void
87 printf ("hb-view (harfbuzz) %s\n", PACKAGE_VERSION);
91 static void parse_features (char *s);
94 parse_opts (int argc, char **argv)
96 argv[0] = (char *) "hb-view";
99 int option_index = 0, c;
100 static struct option long_options[] = {
101 {"background", 1, 0, 'B'},
102 {"debug", 0, &debug, TRUE},
103 {"features", 1, 0, 'f'},
104 {"font-size", 1, 0, 's'},
105 {"foreground", 1, 0, 'F'},
107 {"language", 1, 0, 'L'},
108 {"line-space", 1, 0, 'l'},
109 {"margin", 1, 0, 'm'},
110 {"output", 1, 0, 'o'},
111 {"script", 1, 0, 'S'},
112 {"version", 0, 0, 'v'},
116 c = getopt_long (argc, argv, "", long_options, &option_index);
131 line_space = atoi (optarg);
134 switch (sscanf (optarg, "%d %d %d %d", &margin_t, &margin_r, &margin_b, &margin_l)) {
135 case 1: margin_r = margin_t;
136 case 2: margin_b = margin_t;
137 case 3: margin_l = margin_r;
141 font_size = strtod (optarg, NULL);
144 parse_features (optarg);
171 if (optind + 2 != argc)
173 font_file = argv[optind++];
174 text = argv[optind++];
179 parse_space (char **pp)
182 #define ISSPACE(c) ((c)==' '||(c)=='\f'||(c)=='\n'||(c)=='\r'||(c)=='\t'||(c)=='\v')
183 while (c = **pp, ISSPACE (c))
189 parse_char (char **pp, char c)
201 parse_uint (char **pp, unsigned int *pv)
206 v = strtol (p, pp, 0);
217 parse_feature_value_prefix (char **pp, hb_feature_t *feature)
219 if (parse_char (pp, '-'))
222 parse_char (pp, '+');
230 parse_feature_tag (char **pp, hb_feature_t *feature)
236 #define ISALNUM(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9'))
237 while (c = **pp, ISALNUM(c))
245 feature->tag = hb_tag_from_string (p);
252 parse_feature_indices (char **pp, hb_feature_t *feature)
257 feature->end = (unsigned int) -1;
259 if (!parse_char (pp, '['))
262 has_start = parse_uint (pp, &feature->start);
264 if (parse_char (pp, ':')) {
265 parse_uint (pp, &feature->end);
268 feature->end = feature->start + 1;
271 return parse_char (pp, ']');
275 parse_feature_value_postfix (char **pp, hb_feature_t *feature)
277 return !parse_char (pp, '=') || parse_uint (pp, &feature->value);
282 parse_one_feature (char **pp, hb_feature_t *feature)
284 return parse_feature_value_prefix (pp, feature) &&
285 parse_feature_tag (pp, feature) &&
286 parse_feature_indices (pp, feature) &&
287 parse_feature_value_postfix (pp, feature) &&
288 (parse_char (pp, ',') || **pp == '\0');
292 skip_one_feature (char **pp)
295 e = strchr (*pp, ',');
299 *pp = *pp + strlen (*pp);
302 static void parse_features (char *s)
312 /* count the features first, so we can allocate memory */
321 features = calloc (num_features, sizeof (*features));
323 /* now do the actual parsing */
327 if (parse_one_feature (&p, &features[num_features]))
330 skip_one_feature (&p);
335 static cairo_glyph_t *
336 _hb_cr_text_glyphs (cairo_t *cr,
337 const char *text, int len,
338 unsigned int *pnum_glyphs)
340 cairo_scaled_font_t *scaled_font = cairo_get_scaled_font (cr);
341 FT_Face ft_face = cairo_ft_scaled_font_lock_face (scaled_font);
342 hb_face_t *hb_face = hb_ft_face_create_cached (ft_face);
343 hb_font_t *hb_font = hb_ft_font_create (ft_face, NULL);
344 hb_buffer_t *hb_buffer;
345 cairo_glyph_t *cairo_glyphs;
346 hb_glyph_info_t *hb_glyph;
347 hb_glyph_position_t *hb_position;
348 unsigned int num_glyphs, i;
353 hb_buffer = hb_buffer_create (len);
355 hb_buffer_set_unicode_funcs (hb_buffer, hb_glib_get_unicode_funcs ());
357 hb_buffer_add_utf8 (hb_buffer, text, len, 0, len);
359 hb_buffer_set_script (hb_buffer, hb_script_from_string (script));
361 hb_buffer_set_language (hb_buffer, hb_language_from_string (language));
363 hb_shape (hb_font, hb_face, hb_buffer, features, num_features);
365 num_glyphs = hb_buffer_get_length (hb_buffer);
366 hb_glyph = hb_buffer_get_glyph_infos (hb_buffer, NULL);
367 hb_position = hb_buffer_get_glyph_positions (hb_buffer, NULL);
368 cairo_glyphs = cairo_glyph_allocate (num_glyphs + 1);
370 for (i = 0; i < num_glyphs; i++)
372 cairo_glyphs[i].index = hb_glyph->codepoint;
373 cairo_glyphs[i].x = (hb_position->x_offset + x) * (1./64);
374 cairo_glyphs[i].y = -(hb_position->y_offset) * (1./64);
375 x += hb_position->x_advance;
380 cairo_glyphs[i].x = x * (1./64);
381 hb_buffer_destroy (hb_buffer);
382 hb_font_destroy (hb_font);
383 hb_face_destroy (hb_face);
384 cairo_ft_scaled_font_unlock_face (scaled_font);
387 *pnum_glyphs = num_glyphs;
392 create_context (void)
395 unsigned int fr, fg, fb, fa, br, bg, bb, ba;
398 cairo_surface_destroy (surface);
400 cairo_pattern_destroy (back_pattern);
402 cairo_pattern_destroy (fore_pattern);
404 br = bg = bb = ba = 255;
405 sscanf (back + (*back=='#'), "%2x%2x%2x%2x", &br, &bg, &bb, &ba);
406 fr = fg = fb = 0; fa = 255;
407 sscanf (fore + (*fore=='#'), "%2x%2x%2x%2x", &fr, &fg, &fb, &fa);
409 if (ba == 255 && fa == 255 && br == bg && bg == bb && fr == fg && fg == fb) {
410 /* grayscale. use A8 surface */
411 surface = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
412 cr = cairo_create (surface);
413 cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
414 cairo_set_source_rgba (cr, 1., 1., 1., br / 255.);
416 back_pattern = cairo_pattern_reference (cairo_get_source (cr));
417 cairo_set_source_rgba (cr, 1., 1., 1., fr / 255.);
418 fore_pattern = cairo_pattern_reference (cairo_get_source (cr));
420 /* color. use (A)RGB surface */
422 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
424 surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
425 cr = cairo_create (surface);
426 cairo_set_source_rgba (cr, br / 255., bg / 255., bb / 255., ba / 255.);
428 back_pattern = cairo_pattern_reference (cairo_get_source (cr));
429 cairo_set_source_rgba (cr, fr / 255., fg / 255., fb / 255., fa / 255.);
430 fore_pattern = cairo_pattern_reference (cairo_get_source (cr));
433 cairo_set_font_face (cr, cairo_face);
442 cairo_font_extents_t font_extents;
444 cairo_glyph_t *glyphs = NULL;
445 unsigned int num_glyphs = 0;
447 const char *end, *p = text;
450 cr= create_context ();
452 cairo_set_font_size (cr, font_size);
453 cairo_font_extents (cr, &font_extents);
462 cairo_text_extents_t extents;
464 end = strchr (p, '\n');
466 end = p + strlen (p);
472 glyphs = _hb_cr_text_glyphs (cr, p, end - p, &num_glyphs);
474 cairo_glyph_extents (cr, glyphs, num_glyphs, &extents);
476 y += ceil (font_extents.ascent);
477 width = MAX (width, extents.x_advance);
479 cairo_translate (cr, x, y);
480 cairo_show_glyphs (cr, glyphs, num_glyphs);
482 y += ceil (font_extents.height - ceil (font_extents.ascent));
484 cairo_glyph_free (glyphs);
490 height = y + margin_b;
491 width += margin_l + margin_r;
499 main (int argc, char **argv)
501 cairo_status_t status;
503 setlocale (LC_ALL, "");
505 parse_opts (argc, argv);
507 FT_Init_FreeType (&ft_library);
508 if (FT_New_Face (ft_library, font_file, 0, &ft_face)) {
509 fprintf (stderr, "Failed to open font file `%s'\n", font_file);
512 cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
517 status = cairo_surface_write_to_png (surface, out_file);
518 if (status != CAIRO_STATUS_SUCCESS) {
519 fprintf (stderr, "Failed to write output file `%s': %s\n",
520 out_file, cairo_status_to_string (status));
527 cairo_pattern_destroy (fore_pattern);
528 cairo_pattern_destroy (back_pattern);
529 cairo_surface_destroy (surface);
530 cairo_font_face_destroy (cairo_face);
531 cairo_debug_reset_static_data ();
533 FT_Done_Face (ft_face);
534 FT_Done_FreeType (ft_library);