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