/* GIMP - The GNU Image Manipulation Program * Copyright (C) 1995 Spencer Kimball and Peter Mattis * * gimpfont.c * Copyright (C) 2003 Michael Natterer * Sven Neumann * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "config.h" #include #include #include #include #include #include #define PANGO_ENABLE_ENGINE 1 /* Argh */ #include #include #include FT_TRUETYPE_TABLES_H #include "text-types.h" #include "core/gimptempbuf.h" #include "gimpfont.h" #include "gimp-intl.h" /* This is a so-called pangram; it's supposed to contain all characters found in the alphabet. */ #define GIMP_TEXT_PANGRAM N_("Pack my box with\nfive dozen liquor jugs.") #define GIMP_FONT_POPUP_SIZE (PANGO_SCALE * 30) #define DEBUGPRINT(x) /* g_print x */ enum { PROP_0, PROP_PANGO_CONTEXT }; struct _GimpFont { GimpData parent_instance; PangoContext *pango_context; PangoLayout *popup_layout; gint popup_width; gint popup_height; }; struct _GimpFontClass { GimpDataClass parent_class; }; static void gimp_font_constructed (GObject *object); static void gimp_font_finalize (GObject *object); static void gimp_font_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec); static void gimp_font_get_preview_size (GimpViewable *viewable, gint size, gboolean popup, gboolean dot_for_dot, gint *width, gint *height); static gboolean gimp_font_get_popup_size (GimpViewable *viewable, gint width, gint height, gboolean dot_for_dot, gint *popup_width, gint *popup_height); static GimpTempBuf * gimp_font_get_new_preview (GimpViewable *viewable, GimpContext *context, gint width, gint height); static const gchar * gimp_font_get_sample_string (PangoContext *context, PangoFontDescription *font_desc); G_DEFINE_TYPE (GimpFont, gimp_font, GIMP_TYPE_DATA) #define parent_class gimp_font_parent_class static void gimp_font_class_init (GimpFontClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass); object_class->constructed = gimp_font_constructed; object_class->finalize = gimp_font_finalize; object_class->set_property = gimp_font_set_property; viewable_class->get_preview_size = gimp_font_get_preview_size; viewable_class->get_popup_size = gimp_font_get_popup_size; viewable_class->get_new_preview = gimp_font_get_new_preview; viewable_class->default_icon_name = "gtk-select-font"; g_object_class_install_property (object_class, PROP_PANGO_CONTEXT, g_param_spec_object ("pango-context", NULL, NULL, PANGO_TYPE_CONTEXT, GIMP_PARAM_WRITABLE)); } static void gimp_font_init (GimpFont *font) { } static void gimp_font_constructed (GObject *object) { G_OBJECT_CLASS (parent_class)->constructed (object); gimp_data_make_internal (GIMP_DATA (object), gimp_object_get_name (object)); } static void gimp_font_finalize (GObject *object) { GimpFont *font = GIMP_FONT (object); g_clear_object (&font->pango_context); g_clear_object (&font->popup_layout); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gimp_font_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) { GimpFont *font = GIMP_FONT (object); switch (property_id) { case PROP_PANGO_CONTEXT: if (font->pango_context) g_object_unref (font->pango_context); font->pango_context = g_value_dup_object (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } } static void gimp_font_get_preview_size (GimpViewable *viewable, gint size, gboolean popup, gboolean dot_for_dot, gint *width, gint *height) { *width = size; *height = size; } static gboolean gimp_font_get_popup_size (GimpViewable *viewable, gint width, gint height, gboolean dot_for_dot, gint *popup_width, gint *popup_height) { GimpFont *font = GIMP_FONT (viewable); PangoFontDescription *font_desc; PangoRectangle ink; PangoRectangle logical; const gchar *name; if (! font->pango_context) return FALSE; name = gimp_object_get_name (font); font_desc = pango_font_description_from_string (name); g_return_val_if_fail (font_desc != NULL, FALSE); pango_font_description_set_size (font_desc, GIMP_FONT_POPUP_SIZE); if (font->popup_layout) g_object_unref (font->popup_layout); font->popup_layout = pango_layout_new (font->pango_context); pango_layout_set_font_description (font->popup_layout, font_desc); pango_font_description_free (font_desc); pango_layout_set_text (font->popup_layout, gettext (GIMP_TEXT_PANGRAM), -1); pango_layout_get_pixel_extents (font->popup_layout, &ink, &logical); *popup_width = MAX (ink.width, logical.width) + 6; *popup_height = MAX (ink.height, logical.height) + 6; *popup_width = cairo_format_stride_for_width (CAIRO_FORMAT_A8, *popup_width); font->popup_width = *popup_width; font->popup_height = *popup_height; return TRUE; } static GimpTempBuf * gimp_font_get_new_preview (GimpViewable *viewable, GimpContext *context, gint width, gint height) { GimpFont *font = GIMP_FONT (viewable); PangoLayout *layout; PangoRectangle ink; PangoRectangle logical; gint layout_width; gint layout_height; gint layout_x; gint layout_y; GimpTempBuf *temp_buf; cairo_t *cr; cairo_surface_t *surface; if (! font->pango_context) return NULL; if (! font->popup_layout || font->popup_width != width || font->popup_height != height) { PangoFontDescription *font_desc; const gchar *name; name = gimp_object_get_name (font); DEBUGPRINT (("%s: ", name)); font_desc = pango_font_description_from_string (name); g_return_val_if_fail (font_desc != NULL, NULL); pango_font_description_set_size (font_desc, PANGO_SCALE * height * 2.0 / 3.0); layout = pango_layout_new (font->pango_context); pango_layout_set_font_description (layout, font_desc); pango_layout_set_text (layout, gimp_font_get_sample_string (font->pango_context, font_desc), -1); pango_font_description_free (font_desc); } else { layout = g_object_ref (font->popup_layout); } width = cairo_format_stride_for_width (CAIRO_FORMAT_A8, width); temp_buf = gimp_temp_buf_new (width, height, babl_format ("Y' u8")); memset (gimp_temp_buf_get_data (temp_buf), 255, width * height); surface = cairo_image_surface_create_for_data (gimp_temp_buf_get_data (temp_buf), CAIRO_FORMAT_A8, width, height, width); pango_layout_get_pixel_extents (layout, &ink, &logical); layout_width = MAX (ink.width, logical.width); layout_height = MAX (ink.height, logical.height); layout_x = (width - layout_width) / 2; layout_y = (height - layout_height) / 2; if (ink.x < logical.x) layout_x += logical.x - ink.x; if (ink.y < logical.y) layout_y += logical.y - ink.y; cr = cairo_create (surface); cairo_translate (cr, layout_x, layout_y); cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR); pango_cairo_show_layout (cr, layout); cairo_destroy (cr); cairo_surface_destroy (surface); g_object_unref (layout); return temp_buf; } GimpData * gimp_font_get_standard (void) { static GimpData *standard_font = NULL; if (! standard_font) { standard_font = g_object_new (GIMP_TYPE_FONT, "name", "Standard", NULL); gimp_data_clean (standard_font); gimp_data_make_internal (standard_font, "gimp-font-standard"); g_object_add_weak_pointer (G_OBJECT (standard_font), (gpointer *) &standard_font); } return standard_font; } static inline gboolean gimp_font_covers_string (PangoFcFont *font, const gchar *sample) { const gchar *p; for (p = sample; *p; p = g_utf8_next_char (p)) { if (! pango_fc_font_has_char (font, g_utf8_get_char (p))) return FALSE; } return TRUE; } /* This function was picked up from Pango's pango-ot-info.c. Until there * is a better way to get the tag, we use this. */ static hb_tag_t get_hb_table_type (PangoOTTableType table_type) { switch (table_type) { case PANGO_OT_TABLE_GSUB: return HB_OT_TAG_GSUB; case PANGO_OT_TABLE_GPOS: return HB_OT_TAG_GPOS; default: return HB_TAG_NONE; } } /* Guess a suitable short sample string for the font. */ static const gchar * gimp_font_get_sample_string (PangoContext *context, PangoFontDescription *font_desc) { PangoFont *font; hb_face_t *hb_face; FT_Face face; TT_OS2 *os2; PangoOTTableType tt; gint i; /* This is a table of scripts and corresponding short sample strings * to be used instead of the Latin sample string Aa. The script * codes are as in ISO15924 (see * https://www.unicode.org/iso15924/iso15924-codes.html), but in * lower case. The Unicode subrange bit numbers, as used in TrueType * so-called OS/2 tables, are from * https://www.microsoft.com/typography/otspec/os2.htm#ur . * * The table is mostly ordered by Unicode order. But as there are * fonts that support several of these scripts, the ordering is * be modified so that the script which such a font is more likely * to be actually designed for comes first and matches. * * These sample strings are mostly just guesswork as for their * usefulness. Usually they contain what I assume is the first * letter in the corresponding alphabet, or two first letters if the * first one happens to look too "trivial" to be recognizable by * itself. * * This table is used to determine the primary script a font has * been designed for. * * Very useful link: https://www.wazu.jp/index.html */ static const struct { const gchar script[4]; gint bit; const gchar *sample; } scripts[] = { /* Han is first because fonts that support it presumably are primarily * designed for it. */ { "hani", /* Han Ideographic */ 59, "\346\260\270" /* U+6C38 "forever". Ed Trager says * this is a "pan-stroke" often used * in teaching Chinese calligraphy. It * contains the eight basic Chinese * stroke forms. */ }, { "copt", /* Coptic */ 7, "\316\221\316\261" /* U+0410 GREEK CAPITAL LETTER ALPHA U+0430 GREEK SMALL LETTER ALPHA */ }, { "grek", /* Greek */ 7, "\316\221\316\261" /* U+0410 GREEK CAPITAL LETTER ALPHA U+0430 GREEK SMALL LETTER ALPHA */ }, { "cyrl", /* Cyrillic */ 9, "\320\220\325\260" /* U+0410 CYRILLIC CAPITAL LETTER A U+0430 CYRILLIC SMALL LETTER A */ }, { "armn", /* Armenian */ 10, "\324\261\325\241" /* U+0531 ARMENIAN CAPITAL LETTER AYB U+0561 ARMENIAN SMALL LETTER AYB */ }, { "hebr", /* Hebrew */ 11, "\327\220" /* U+05D0 HEBREW LETTER ALEF */ }, { "arab", /* Arabic */ 13, "\330\247\330\250" /* U+0627 ARABIC LETTER ALEF * U+0628 ARABIC LETTER BEH */ }, { "syrc", /* Syriac */ 71, "\334\220\334\222" /* U+0710 SYRIAC LETTER ALAPH * U+0712 SYRIAC LETTER BETH */ }, { "thaa", /* Thaana */ 72, "\336\200\336\201" /* U+0780 THAANA LETTER HAA * U+0781 THAANA LETTER SHAVIYANI */ }, /* Should really use some better sample strings for the complex * scripts. Something that shows how well the font handles the * complex processing for each script. */ { "deva", /* Devanagari */ 15, "\340\244\205" /* U+0905 DEVANAGARI LETTER A*/ }, { "beng", /* Bengali */ 16, "\340\246\205" /* U+0985 BENGALI LETTER A */ }, { "guru", /* Gurmukhi */ 17, "\340\250\205" /* U+0A05 GURMUKHI LETTER A */ }, { "gujr", /* Gujarati */ 18, "\340\252\205" /* U+0A85 GUJARATI LETTER A */ }, { "orya", /* Oriya */ 19, "\340\254\205" /* U+0B05 ORIYA LETTER A */ }, { "taml", /* Tamil */ 20, "\340\256\205" /* U+0B85 TAMIL LETTER A */ }, { "telu", /* Telugu */ 21, "\340\260\205" /* U+0C05 TELUGU LETTER A */ }, { "knda", /* Kannada */ 22, "\340\262\205" /* U+0C85 KANNADA LETTER A */ }, { "mylm", /* Malayalam */ 23, "\340\264\205" /* U+0D05 MALAYALAM LETTER A */ }, { "sinh", /* Sinhala */ 73, "\340\266\205" /* U+0D85 SINHALA LETTER AYANNA */ }, { "thai", /* Thai */ 24, "\340\270\201\340\270\264"/* U+0E01 THAI CHARACTER KO KAI * U+0E34 THAI CHARACTER SARA I */ }, { "laoo", /* Lao */ 25, "\340\272\201\340\272\264"/* U+0E81 LAO LETTER KO * U+0EB4 LAO VOWEL SIGN I */ }, { "tibt", /* Tibetan */ 70, "\340\274\200" /* U+0F00 TIBETAN SYLLABLE OM */ }, { "mymr", /* Myanmar */ 74, "\341\200\200" /* U+1000 MYANMAR LETTER KA */ }, { "geor", /* Georgian */ 26, "\341\202\240\341\203\200" /* U+10A0 GEORGIAN CAPITAL LETTER AN * U+10D0 GEORGIAN LETTER AN */ }, { "hang", /* Hangul */ 28, "\341\204\200\341\204\201"/* U+1100 HANGUL CHOSEONG KIYEOK * U+1101 HANGUL CHOSEONG SSANGKIYEOK */ }, { "ethi", /* Ethiopic */ 75, "\341\210\200" /* U+1200 ETHIOPIC SYLLABLE HA */ }, { "cher", /* Cherokee */ 76, "\341\216\243" /* U+13A3 CHEROKEE LETTER O */ }, { "cans", /* Unified Canadian Aboriginal Syllabics */ 77, "\341\220\201" /* U+1401 CANADIAN SYLLABICS E */ }, { "ogam", /* Ogham */ 78, "\341\232\201" /* U+1681 OGHAM LETTER BEITH */ }, { "runr", /* Runic */ 79, "\341\232\240" /* U+16A0 RUNIC LETTER FEHU FEOH FE F */ }, { "tglg", /* Tagalog */ 84, "\341\234\200" /* U+1700 TAGALOG LETTER A */ }, { "hano", /* Hanunoo */ -1, "\341\234\240" /* U+1720 HANUNOO LETTER A */ }, { "buhd", /* Buhid */ -1, "\341\235\200" /* U+1740 BUHID LETTER A */ }, { "tagb", /* Tagbanwa */ -1, "\341\235\240" /* U+1760 TAGBANWA LETTER A */ }, { "khmr", /* Khmer */ 80, "\341\236\201\341\237\222\341\236\211\341\236\273\341\237\206" /* U+1781 KHMER LETTER KHA * U+17D2 KHMER LETTER SIGN COENG * U+1789 KHMER LETTER NYO * U+17BB KHMER VOWEL SIGN U * U+17C6 KHMER SIGN NIKAHIT * A common word meaning "I" that contains * lots of complex processing. */ }, { "mong", /* Mongolian */ 81, "\341\240\240" /* U+1820 MONGOLIAN LETTER A */ }, { "limb", /* Limbu */ -1, "\341\244\201" /* U+1901 LIMBU LETTER KA */ }, { "tale", /* Tai Le */ -1, "\341\245\220" /* U+1950 TAI LE LETTER KA */ }, { "latn", /* Latin */ 0, "Aa" } }; gint ot_alts[4]; gint n_ot_alts = 0; gint sr_alts[20]; gint n_sr_alts = 0; font = pango_context_load_font (context, font_desc); g_return_val_if_fail (PANGO_IS_FC_FONT (font), "Aa"); face = pango_fc_font_lock_face (PANGO_FC_FONT (font)); g_return_val_if_fail (face != NULL, "Aa"); hb_face = hb_ft_face_create (face, NULL); /* First check what script(s), if any, the font has GSUB or GPOS * OpenType layout tables for. */ for (tt = PANGO_OT_TABLE_GSUB; n_ot_alts < G_N_ELEMENTS (ot_alts) && tt <= PANGO_OT_TABLE_GPOS; tt++) { hb_tag_t tag; unsigned int count; PangoOTTag *slist; tag = get_hb_table_type (tt); count = hb_ot_layout_table_get_script_tags (hb_face, tag, 0, NULL, NULL); slist = g_new (PangoOTTag, count + 1); hb_ot_layout_table_get_script_tags (hb_face, tag, 0, &count, slist); slist[count] = 0; for (i = 0; n_ot_alts < G_N_ELEMENTS (ot_alts) && i < G_N_ELEMENTS (scripts); i++) { gint j, k; for (k = 0; k < n_ot_alts; k++) if (ot_alts[k] == i) break; if (k == n_ot_alts) { for (j = 0; n_ot_alts < G_N_ELEMENTS (ot_alts) && slist[j]; j++) { #define TAG(s) FT_MAKE_TAG (s[0], s[1], s[2], s[3]) if (slist[j] == TAG (scripts[i].script) && gimp_font_covers_string (PANGO_FC_FONT (font), scripts[i].sample)) { ot_alts[n_ot_alts++] = i; DEBUGPRINT (("%.4s ", scripts[i].script)); } #undef TAG } } } g_free (slist); } hb_face_destroy (hb_face); DEBUGPRINT (("; OS/2: ")); /* Next check the OS/2 table for Unicode ranges the font claims * to cover. */ os2 = FT_Get_Sfnt_Table (face, ft_sfnt_os2); if (os2) { for (i = 0; n_sr_alts < G_N_ELEMENTS (sr_alts) && i < G_N_ELEMENTS (scripts); i++) { if (scripts[i].bit >= 0 && (&os2->ulUnicodeRange1)[scripts[i].bit/32] & (1 << (scripts[i].bit % 32)) && gimp_font_covers_string (PANGO_FC_FONT (font), scripts[i].sample)) { sr_alts[n_sr_alts++] = i; DEBUGPRINT (("%.4s ", scripts[i].script)); } } } pango_fc_font_unlock_face (PANGO_FC_FONT (font)); g_object_unref (font); if (n_ot_alts > 2) { /* The font has OpenType tables for several scripts. If it * support Basic Latin as well, use Aa. */ gint i; for (i = 0; i < n_sr_alts; i++) if (scripts[sr_alts[i]].bit == 0) { DEBUGPRINT (("=> several OT, also latin, use Aa\n")); return "Aa"; } } if (n_ot_alts > 0 && n_sr_alts >= n_ot_alts + 3) { /* At least one script with an OpenType table, but many more * subranges than such scripts. If it supports Basic Latin, * use Aa, else the highest priority subrange. */ gint i; for (i = 0; i < n_sr_alts; i++) if (scripts[sr_alts[i]].bit == 0) { DEBUGPRINT (("=> several SR, also latin, use Aa\n")); return "Aa"; } DEBUGPRINT (("=> several SR, use %.4s\n", scripts[sr_alts[0]].script)); return scripts[sr_alts[0]].sample; } if (n_ot_alts > 0) { /* OpenType tables for at least one script, use the * highest priority one */ DEBUGPRINT (("=> at least one OT, use %.4s\n", scripts[sr_alts[0]].script)); return scripts[ot_alts[0]].sample; } if (n_sr_alts > 0) { /* Use the highest priority subrange. This means that a * font that supports Greek, Cyrillic and Latin (quite * common), will get the Greek sample string. That is * capital and lowercase alpha, which looks like capital A * and lowercase alpha, so it's actually quite nice, and * doesn't give a too strong impression that the font would * be for Greek only. */ DEBUGPRINT (("=> at least one SR, use %.4s\n", scripts[sr_alts[0]].script)); return scripts[sr_alts[0]].sample; } /* Final fallback */ DEBUGPRINT (("=> fallback, use Aa\n")); return "Aa"; }