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Gimp/app/text/gimpfont.c
Jehan b7796b0bfb app: improve sample text logics for CJK fonts. 
First of all, "CJK Unified Ideographs" block should not be the highest
priority to determine showing an ideograph. Indeed most fonts for a
Korean and Japanese audience would also contain at least the main
ideographs. So instead, look first for Korean alphabet (Hangul) and
Japanese syllabaries to determine if it's a Korean or Japanese-targetted
font. Only then Chinese.
Also check Korean before Japanese because most of the Korean fonts I saw
actually also include Japanese syllabaries (but not the other way
around).
This way, it will be much easier for CJK graphists to skim through the
font list and detect fonts made for the needed language in a glance.

Also modifying the Korean display text. KIYEOK and SSANGKIYEOK were
obviously chosen because they were the first in the block. But they are
very bad choice. We hesitated with 가 at first, as it is considered the
first in the syllabary form (가나다라 is kind of similar to our ABCD).
But it wouldn't show a form with a second consonant (below) which is a
good stylistic indication. So we hesitated between 한 (han) and 글
(geul, which also means text so it's a nice sample), and finally went
with 한 because of the circle shape in ㅎ (hieut) but also its small
"hat" which has many stylistic variants. So it's quite a good hint of
stylistic choices made by a font designer from just the sample box.

Moreover I switched the block check from "Hangul Jamo" to "Hangul
Syllables" block. "Hangul Jamo" are positional forms of the letters to
dynamically compose syllables (in particular legacy syllables not in use
anymore). Though a feature-full Korean font set would design these, it
is less important than "Hangul Syllables" (pre-composed syllables
design) or "Hangul Compatibility Jamo" (basically the same letters as
"Hangul Jamo" but for standalone usage). Also I actually saw some fonts
made for Korean without "Hangul Syllables" support.

Finally I also added a test for Japanese. I check the Hiragana block
which is most likely the most basic which has to be in any
Japanese-targetted font and use 'あ' (a) as sample text, which is the
first Hiragana syllable and here definitely a good sample text in my
opinion.

I believe that this can still be improved though. Checking only a single
block to determine the probable target language is not necessarily
enough. For instance very complete fonts for Chinese may also design
Korean and Japanese characters, but will also have most CJK blocks and
more ideographs (whereas Japanese/Korean will likely have less). Yet
let's say this is good for now, at least better than before!
2020-11-15 21:55:32 +01:00

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpfont.c
* Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
* Sven Neumann <sven@gimp.org>
*
* 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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include <pango/pangocairo.h>
#include <hb.h>
#include <hb-ot.h>
#include <hb-ft.h>
#define PANGO_ENABLE_ENGINE 1 /* Argh */
#include <pango/pango-ot.h>
#include <ft2build.h>
#include FT_TRUETYPE_TABLES_H
#include "libgimpbase/gimpbase.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 (PangoFont *font,
const gchar *sample)
{
const gchar *p;
for (p = sample; *p; p = g_utf8_next_char (p))
{
if (! pango_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;
hb_font_t *hb_font;
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[] = {
/* CJK are first because fonts that support these characters
* presumably are primarily designed for it.
*
* Though not a universal rules, most fonts targetting Korean will
* also have the ideographs as they were used historically (and
* still in some cases). As for Japanese, ideographs are still
* definitely used daily. After all the block is called "*CJK*
* (Chinese-Japanese-Korean) Unified Ideographs". So let's give the
* Chinese representation less priority towards finding
* Korean/Japanese targetting.
* Then we prioritize Korean because many fonts for Korean also
* design Hiragana/Katakana blocks. On the other hand, I could see
* very few (none so far) Japanese fonts designing also Hangul
* characters. So if we see both Hiragana and Hangul, we can assume
* this is a font for Korean market, whereas Hiragana only is for
* Japanese.
* XXX: of course we could probably come with a better algorithm to
* determine the target language. Probably looking at more than the
* existence of a single block would help (since some languages are
* spread on several blocks).
*/
{
"hang", /* Korean alphabet (Hangul) */
56, /* Hangul Syllables block */
"\355\225\234" /* U+D55C HANGUL SYLLABLE HAN */
},
{
"japa", /* Japanese */
49, /* Hiragana block */
"\343\201\202" /* U+3042 HIRAGANA LETTER A */
},
{
"hani", /* Han Ideographic */
59, /* CJK Unified Ideographs */
"\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
*/
},
{
"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");
hb_font = pango_font_get_hb_font (font);
g_return_val_if_fail (hb_font != NULL, "Aa");
/* These are needed to set hb_font to the right internal format, which
* can only work if the font is not immutable. Hence we make a copy.
*/
hb_font = hb_font_create_sub_font (hb_font);
hb_ft_font_set_funcs (hb_font);
/* TODO: use hb_ft_font_lock_face/hb_ft_font_unlock_face() when we
* bump to harfbuzz >= 2.6.5.
*/
face = hb_ft_font_get_face (hb_font);
/* Are there actual cases where this function could return NULL while
* it's not a bug in the code?
* For instance if the font file is broken, we don't want to return a
* CRITICAL, but properly address the issue (removing the font with a
* warning or whatnot).
* See #5922.
*/
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 (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 (font, scripts[i].sample))
{
sr_alts[n_sr_alts++] = i;
DEBUGPRINT (("%.4s ", scripts[i].script));
}
}
}
hb_font_destroy (hb_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";
}
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