505 lines
13 KiB
C++
505 lines
13 KiB
C++
/*
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* Copyright © 2011 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#include "options.hh"
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#if HAVE_FREETYPE
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#include <hb-ft.h>
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#endif
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bool debug = FALSE;
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static gchar *
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shapers_to_string (void)
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{
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GString *shapers = g_string_new (NULL);
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const char **shaper_list = hb_shape_list_shapers ();
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for (; *shaper_list; shaper_list++) {
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g_string_append (shapers, *shaper_list);
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g_string_append_c (shapers, ',');
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}
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g_string_truncate (shapers, MAX (0, (gint)shapers->len - 1));
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return g_string_free (shapers, FALSE);
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}
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static G_GNUC_NORETURN gboolean
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show_version (const char *name G_GNUC_UNUSED,
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const char *arg G_GNUC_UNUSED,
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gpointer data G_GNUC_UNUSED,
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GError **error G_GNUC_UNUSED)
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{
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g_printf ("%s (%s) %s\n", g_get_prgname (), PACKAGE_NAME, PACKAGE_VERSION);
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char *shapers = shapers_to_string ();
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g_printf ("Available shapers: %s\n", shapers);
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g_free (shapers);
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if (strcmp (HB_VERSION_STRING, hb_version_string ()))
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g_printf ("Linked HarfBuzz library has a different version: %s\n", hb_version_string ());
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exit(0);
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}
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void
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option_parser_t::add_main_options (void)
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{
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GOptionEntry entries[] =
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{
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{"version", 0, G_OPTION_FLAG_NO_ARG,
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G_OPTION_ARG_CALLBACK, (gpointer) &show_version, "Show version numbers", NULL},
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{"debug", 0, 0, G_OPTION_ARG_NONE, &debug, "Free all resources before exit", NULL},
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{NULL}
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};
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g_option_context_add_main_entries (context, entries, NULL);
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}
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static gboolean
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pre_parse (GOptionContext *context G_GNUC_UNUSED,
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GOptionGroup *group G_GNUC_UNUSED,
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gpointer data,
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GError **error)
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{
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option_group_t *option_group = (option_group_t *) data;
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option_group->pre_parse (error);
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return *error == NULL;
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}
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static gboolean
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post_parse (GOptionContext *context G_GNUC_UNUSED,
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GOptionGroup *group G_GNUC_UNUSED,
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gpointer data,
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GError **error)
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{
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option_group_t *option_group = static_cast<option_group_t *>(data);
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option_group->post_parse (error);
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return *error == NULL;
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}
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void
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option_parser_t::add_group (GOptionEntry *entries,
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const gchar *name,
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const gchar *description,
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const gchar *help_description,
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option_group_t *option_group)
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{
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GOptionGroup *group = g_option_group_new (name, description, help_description,
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static_cast<gpointer>(option_group), NULL);
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g_option_group_add_entries (group, entries);
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g_option_group_set_parse_hooks (group, pre_parse, post_parse);
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g_option_context_add_group (context, group);
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}
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void
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option_parser_t::parse (int *argc, char ***argv)
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{
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GError *parse_error = NULL;
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if (!g_option_context_parse (context, argc, argv, &parse_error))
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{
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if (parse_error != NULL)
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fail (TRUE, "%s", parse_error->message);
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else
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fail (TRUE, "Option parse error");
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}
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}
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static gboolean
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parse_margin (const char *name G_GNUC_UNUSED,
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const char *arg,
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gpointer data,
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GError **error G_GNUC_UNUSED)
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{
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view_options_t *view_opts = (view_options_t *) data;
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view_options_t::margin_t &m = view_opts->margin;
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switch (sscanf (arg, "%lf %lf %lf %lf", &m.t, &m.r, &m.b, &m.l)) {
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case 1: m.r = m.t;
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case 2: m.b = m.t;
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case 3: m.l = m.r;
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case 4: return TRUE;
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default:
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g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
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"%s argument should be one to four space-separated numbers",
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name);
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return FALSE;
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}
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}
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static gboolean
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parse_shapers (const char *name G_GNUC_UNUSED,
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const char *arg,
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gpointer data,
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GError **error G_GNUC_UNUSED)
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{
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shape_options_t *shape_opts = (shape_options_t *) data;
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shape_opts->shapers = g_strsplit (arg, ",", 0);
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return TRUE;
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}
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static void
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parse_space (char **pp)
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{
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char c;
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#define ISSPACE(c) ((c)==' '||(c)=='\f'||(c)=='\n'||(c)=='\r'||(c)=='\t'||(c)=='\v')
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while (c = **pp, ISSPACE (c))
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(*pp)++;
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#undef ISSPACE
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}
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static hb_bool_t
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parse_char (char **pp, char c)
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{
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parse_space (pp);
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if (**pp != c)
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return FALSE;
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(*pp)++;
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return TRUE;
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}
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static hb_bool_t
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parse_uint (char **pp, unsigned int *pv)
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{
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char *p = *pp;
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unsigned int v;
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v = strtol (p, pp, 0);
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if (p == *pp)
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return FALSE;
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*pv = v;
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return TRUE;
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}
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static hb_bool_t
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parse_feature_value_prefix (char **pp, hb_feature_t *feature)
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{
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if (parse_char (pp, '-'))
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feature->value = 0;
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else {
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parse_char (pp, '+');
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feature->value = 1;
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}
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return TRUE;
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}
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static hb_bool_t
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parse_feature_tag (char **pp, hb_feature_t *feature)
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{
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char *p = *pp, c;
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parse_space (pp);
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#define ISALNUM(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9'))
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while (c = **pp, ISALNUM(c))
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(*pp)++;
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#undef ISALNUM
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if (p == *pp)
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return FALSE;
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feature->tag = hb_tag_from_string (p, *pp - p);
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return TRUE;
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}
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static hb_bool_t
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parse_feature_indices (char **pp, hb_feature_t *feature)
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{
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hb_bool_t has_start;
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feature->start = 0;
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feature->end = (unsigned int) -1;
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if (!parse_char (pp, '['))
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return TRUE;
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has_start = parse_uint (pp, &feature->start);
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if (parse_char (pp, ':')) {
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parse_uint (pp, &feature->end);
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} else {
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if (has_start)
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feature->end = feature->start + 1;
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}
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return parse_char (pp, ']');
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}
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static hb_bool_t
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parse_feature_value_postfix (char **pp, hb_feature_t *feature)
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{
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return !parse_char (pp, '=') || parse_uint (pp, &feature->value);
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}
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static hb_bool_t
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parse_one_feature (char **pp, hb_feature_t *feature)
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{
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return parse_feature_value_prefix (pp, feature) &&
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parse_feature_tag (pp, feature) &&
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parse_feature_indices (pp, feature) &&
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parse_feature_value_postfix (pp, feature) &&
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(parse_char (pp, ',') || **pp == '\0');
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}
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static void
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skip_one_feature (char **pp)
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{
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char *e;
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e = strchr (*pp, ',');
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if (e)
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*pp = e + 1;
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else
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*pp = *pp + strlen (*pp);
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}
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static gboolean
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parse_features (const char *name G_GNUC_UNUSED,
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const char *arg,
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gpointer data,
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GError **error G_GNUC_UNUSED)
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{
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shape_options_t *shape_opts = (shape_options_t *) data;
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char *s = (char *) arg;
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char *p;
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shape_opts->num_features = 0;
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shape_opts->features = NULL;
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if (!*s)
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return TRUE;
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/* count the features first, so we can allocate memory */
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p = s;
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do {
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shape_opts->num_features++;
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p = strchr (p, ',');
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if (p)
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p++;
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} while (p);
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shape_opts->features = (hb_feature_t *) calloc (shape_opts->num_features, sizeof (*shape_opts->features));
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/* now do the actual parsing */
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p = s;
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shape_opts->num_features = 0;
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while (*p) {
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if (parse_one_feature (&p, &shape_opts->features[shape_opts->num_features]))
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shape_opts->num_features++;
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else
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skip_one_feature (&p);
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}
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return TRUE;
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}
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void
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view_options_t::add_options (option_parser_t *parser)
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{
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GOptionEntry entries[] =
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{
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{"annotate", 0, 0, G_OPTION_ARG_NONE, &this->annotate, "Annotate output rendering", NULL},
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{"background", 0, 0, G_OPTION_ARG_STRING, &this->back, "Set background color (default: "DEFAULT_BACK")", "red/#rrggbb/#rrggbbaa"},
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{"foreground", 0, 0, G_OPTION_ARG_STRING, &this->fore, "Set foreground color (default: "DEFAULT_FORE")", "red/#rrggbb/#rrggbbaa"},
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{"line-space", 0, 0, G_OPTION_ARG_DOUBLE, &this->line_space, "Set space between lines (default: 0)", "units"},
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{"margin", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_margin, "Margin around output (default: "G_STRINGIFY(DEFAULT_MARGIN)")","one to four numbers"},
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{NULL}
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};
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parser->add_group (entries,
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"view",
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"View options:",
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"Options controlling the output rendering",
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this);
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}
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void
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shape_options_t::add_options (option_parser_t *parser)
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{
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GOptionEntry entries[] =
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{
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{"shapers", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Comma-separated list of shapers", "list"},
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{"direction", 0, 0, G_OPTION_ARG_STRING, &this->direction, "Set text direction (default: auto)", "ltr/rtl/ttb/btt"},
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{"language", 0, 0, G_OPTION_ARG_STRING, &this->language, "Set text language (default: $LANG)", "langstr"},
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{"script", 0, 0, G_OPTION_ARG_STRING, &this->script, "Set text script (default: auto)", "ISO-15924 tag"},
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{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, "Font features to apply to text", "TODO"},
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{NULL}
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};
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parser->add_group (entries,
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"shape",
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"Shape options:",
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"Options controlling the shaping process",
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this);
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}
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void
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font_options_t::add_options (option_parser_t *parser)
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{
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GOptionEntry entries[] =
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{
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{"font-file", 0, 0, G_OPTION_ARG_STRING, &this->font_file, "Font file-name", "filename"},
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{"face-index", 0, 0, G_OPTION_ARG_INT, &this->face_index, "Face index (default: 0)", "index"},
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{"font-size", 0, 0, G_OPTION_ARG_DOUBLE, &this->font_size, "Font size (default: "G_STRINGIFY(DEFAULT_FONT_SIZE)")","size"},
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{NULL}
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};
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parser->add_group (entries,
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"font",
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"Font options:",
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"Options controlling the font",
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this);
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}
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void
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text_options_t::add_options (option_parser_t *parser)
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{
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GOptionEntry entries[] =
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{
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{"text", 0, 0, G_OPTION_ARG_STRING, &this->text, "Set input text", "string"},
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{"text-file", 0, 0, G_OPTION_ARG_STRING, &this->text_file, "Set input text file-name", "filename"},
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{NULL}
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};
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parser->add_group (entries,
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"text",
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"Text options:",
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"Options controlling the input text",
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this);
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}
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void
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output_options_t::add_options (option_parser_t *parser)
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{
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GOptionEntry entries[] =
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{
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{"output", 0, 0, G_OPTION_ARG_STRING, &this->output_file, "Set output file-name (default: stdout)","filename"},
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{"format", 0, 0, G_OPTION_ARG_STRING, &this->output_format, "Set output format", "format"},
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{NULL}
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};
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parser->add_group (entries,
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"output",
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"Output options:",
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"Options controlling the output",
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this);
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}
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hb_font_t *
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font_options_t::get_font (void) const
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{
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if (font)
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return font;
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hb_blob_t *blob = NULL;
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/* Create the blob */
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{
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const char *font_data;
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unsigned int len;
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hb_destroy_func_t destroy;
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void *user_data;
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hb_memory_mode_t mm;
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if (!font_file)
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fail (TRUE, "No font file set");
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GMappedFile *mf = g_mapped_file_new (font_file, FALSE, NULL);
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if (!mf)
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fail (FALSE, "Failed opening font file `%s'", font_file);
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font_data = g_mapped_file_get_contents (mf);
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len = g_mapped_file_get_length (mf);
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destroy = (hb_destroy_func_t) g_mapped_file_unref;
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user_data = (void *) mf;
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mm = HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE;
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blob = hb_blob_create (font_data, len, mm, user_data, destroy);
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}
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/* Create the face */
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hb_face_t *face = hb_face_create (blob, face_index);
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hb_blob_destroy (blob);
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font = hb_font_create (face);
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unsigned int upem = hb_face_get_upem (face);
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hb_font_set_scale (font, font_size * upem, font_size * upem);
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hb_face_destroy (face);
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#if HAVE_FREETYPE
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hb_ft_font_set_funcs (font);
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#endif
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return font;
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}
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const char *
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text_options_t::get_line (unsigned int *len)
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{
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if (!text) {
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if (!text_file)
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fail (TRUE, "At least one of text or text-file must be set");
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GMappedFile *mf = g_mapped_file_new (text_file, FALSE, NULL);
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if (!mf)
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fail (FALSE, "Failed opening text file `%s'", text_file);
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text = g_mapped_file_get_contents (mf);
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text_len = g_mapped_file_get_length (mf);
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}
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if (text_len == (unsigned int) -1)
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text_len = strlen (text);
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if (!text_len) {
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*len = 0;
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return NULL;
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}
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const char *ret = text;
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const char *p = (const char *) memchr (text, '\n', text_len);
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unsigned int ret_len;
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if (!p) {
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ret_len = text_len;
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text += ret_len;
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text_len = 0;
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} else {
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ret_len = p - ret;
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text += ret_len + 1;
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text_len -= ret_len + 1;
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}
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*len = ret_len;
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return ret;
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}
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