/* * Copyright © 2011 Google, Inc. * * 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. * * Google Author(s): Behdad Esfahbod */ #ifndef FONT_OPTIONS_HH #define FONT_OPTIONS_HH #include "face-options.hh" #ifdef HAVE_FREETYPE #include #endif #include #define FONT_SIZE_UPEM 0x7FFFFFFF #define FONT_SIZE_NONE 0 extern const unsigned DEFAULT_FONT_SIZE; extern const unsigned SUBPIXEL_BITS; struct font_options_t : face_options_t { ~font_options_t () { free (variations); g_free (font_funcs); hb_font_destroy (font); } void add_options (option_parser_t *parser); hb_font_t *get_font () const; hb_variation_t *variations = nullptr; unsigned int num_variations = 0; int x_ppem = 0; int y_ppem = 0; double ptem = 0.; unsigned int subpixel_bits = SUBPIXEL_BITS; mutable double font_size_x = DEFAULT_FONT_SIZE; mutable double font_size_y = DEFAULT_FONT_SIZE; char *font_funcs = nullptr; int ft_load_flags = 2; private: mutable hb_font_t *font = nullptr; }; static struct supported_font_funcs_t { char name[4]; void (*func) (hb_font_t *); } supported_font_funcs[] = { #ifdef HAVE_FREETYPE {"ft", hb_ft_font_set_funcs}, #endif {"ot", hb_ot_font_set_funcs}, }; hb_font_t * font_options_t::get_font () const { if (font) return font; font = hb_font_create (face); if (font_size_x == FONT_SIZE_UPEM) font_size_x = hb_face_get_upem (face); if (font_size_y == FONT_SIZE_UPEM) font_size_y = hb_face_get_upem (face); hb_font_set_ppem (font, x_ppem, y_ppem); hb_font_set_ptem (font, ptem); int scale_x = (int) scalbnf (font_size_x, subpixel_bits); int scale_y = (int) scalbnf (font_size_y, subpixel_bits); hb_font_set_scale (font, scale_x, scale_y); hb_font_set_variations (font, variations, num_variations); void (*set_font_funcs) (hb_font_t *) = nullptr; if (!font_funcs) { set_font_funcs = supported_font_funcs[0].func; } else { for (unsigned int i = 0; i < ARRAY_LENGTH (supported_font_funcs); i++) if (0 == g_ascii_strcasecmp (font_funcs, supported_font_funcs[i].name)) { set_font_funcs = supported_font_funcs[i].func; break; } if (!set_font_funcs) { GString *s = g_string_new (nullptr); for (unsigned int i = 0; i < ARRAY_LENGTH (supported_font_funcs); i++) { if (i) g_string_append_c (s, '/'); g_string_append (s, supported_font_funcs[i].name); } g_string_append_c (s, '\n'); char *p = g_string_free (s, FALSE); fail (false, "Unknown font function implementation `%s'; supported values are: %s; default is %s", font_funcs, p, supported_font_funcs[0].name); //free (p); } } set_font_funcs (font); #ifdef HAVE_FREETYPE hb_ft_font_set_load_flags (font, ft_load_flags); #endif return font; } static gboolean parse_variations (const char *name G_GNUC_UNUSED, const char *arg, gpointer data, GError **error G_GNUC_UNUSED) { font_options_t *font_opts = (font_options_t *) data; char *s = (char *) arg; char *p; font_opts->num_variations = 0; g_free (font_opts->variations); font_opts->variations = nullptr; if (!*s) return true; /* count the variations first, so we can allocate memory */ p = s; do { font_opts->num_variations++; p = strchr (p, ','); if (p) p++; } while (p); font_opts->variations = (hb_variation_t *) calloc (font_opts->num_variations, sizeof (*font_opts->variations)); if (!font_opts->variations) return false; /* now do the actual parsing */ p = s; font_opts->num_variations = 0; while (p && *p) { char *end = strchr (p, ','); if (hb_variation_from_string (p, end ? end - p : -1, &font_opts->variations[font_opts->num_variations])) font_opts->num_variations++; p = end ? end + 1 : nullptr; } return true; } static gboolean parse_font_size (const char *name G_GNUC_UNUSED, const char *arg, gpointer data, GError **error G_GNUC_UNUSED) { font_options_t *font_opts = (font_options_t *) data; if (0 == strcmp (arg, "upem")) { font_opts->font_size_y = font_opts->font_size_x = FONT_SIZE_UPEM; return true; } switch (sscanf (arg, "%lf%*[ ,]%lf", &font_opts->font_size_x, &font_opts->font_size_y)) { case 1: font_opts->font_size_y = font_opts->font_size_x; HB_FALLTHROUGH; case 2: return true; default: g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE, "%s argument should be one or two space-separated numbers", name); return false; } } static gboolean parse_font_ppem (const char *name G_GNUC_UNUSED, const char *arg, gpointer data, GError **error G_GNUC_UNUSED) { font_options_t *font_opts = (font_options_t *) data; switch (sscanf (arg, "%d%*[ ,]%d", &font_opts->x_ppem, &font_opts->y_ppem)) { case 1: font_opts->y_ppem = font_opts->x_ppem; HB_FALLTHROUGH; case 2: return true; default: g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE, "%s argument should be one or two space-separated numbers", name); return false; } } void font_options_t::add_options (option_parser_t *parser) { face_options_t::add_options (parser); char *text = nullptr; { static_assert ((ARRAY_LENGTH_CONST (supported_font_funcs) > 0), "No supported font-funcs found."); GString *s = g_string_new (nullptr); g_string_printf (s, "Set font functions implementation to use (default: %s)\n\n Supported font function implementations are: %s", supported_font_funcs[0].name, supported_font_funcs[0].name); for (unsigned int i = 1; i < ARRAY_LENGTH (supported_font_funcs); i++) { g_string_append_c (s, '/'); g_string_append (s, supported_font_funcs[i].name); } text = g_string_free (s, FALSE); parser->free_later (text); } char *font_size_text; if (DEFAULT_FONT_SIZE == FONT_SIZE_UPEM) font_size_text = (char *) "Font size (default: upem)"; else { font_size_text = g_strdup_printf ("Font size (default: %d)", DEFAULT_FONT_SIZE); parser->free_later (font_size_text); } int font_size_flags = DEFAULT_FONT_SIZE == FONT_SIZE_NONE ? G_OPTION_FLAG_HIDDEN : 0; GOptionEntry entries[] = { {"font-size", 0, font_size_flags, G_OPTION_ARG_CALLBACK, (gpointer) &parse_font_size, font_size_text, "1/2 integers or 'upem'"}, {"font-ppem", 0, font_size_flags, G_OPTION_ARG_CALLBACK, (gpointer) &parse_font_ppem, "Set x,y pixels per EM (default: 0; disabled)", "1/2 integers"}, {"font-ptem", 0, 0, G_OPTION_ARG_DOUBLE, &this->ptem, "Set font point-size (default: 0; disabled)", "point-size"}, {"font-funcs", 0, 0, G_OPTION_ARG_STRING, &this->font_funcs, text, "impl"}, {"ft-load-flags", 0, 0, G_OPTION_ARG_INT, &this->ft_load_flags, "Set FreeType load-flags (default: 2)", "integer"}, {nullptr} }; parser->add_group (entries, "font", "Font-instance options:", "Options for the font instance", this); const gchar *variations_help = "Comma-separated list of font variations\n" "\n" " Variations are set globally. The format for specifying variation settings\n" " follows. All valid CSS font-variation-settings values other than 'normal'\n" " and 'inherited' are also accepted, though, not documented below.\n" "\n" " The format is a tag, optionally followed by an equals sign, followed by a\n" " number. For example:\n" "\n" " \"wght=500\"\n" " \"slnt=-7.5\""; GOptionEntry entries2[] = { {"variations", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_variations, variations_help, "list"}, {nullptr} }; parser->add_group (entries2, "variations", "Variations options:", "Options for font variations used", this); } #endif