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mate-control-center/font-viewer/font-thumbnailer.c

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/* -*- mode: C; c-basic-offset: 4 -*- */
/*
* font-thumbnailer: a thumbnailer for font files, using FreeType
*
* Copyright (C) 2002-2003 James Henstridge <james@daa.com.au>
* Copyright (C) 2012 Cosimo Cecchi <cosimoc@gnome.org>
* Copyright (C) 2013-2021 MATE Developers
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef ENABLE_NLS
#include <locale.h>
#endif /* ENABLE_NLS */
#include <ft2build.h>
#include <math.h>
#include FT_FREETYPE_H
#include <gdk/gdk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gio/gio.h>
#include <glib/gi18n.h>
#include <cairo/cairo-ft.h>
#include "sushi-font-loader.h"
#include "totem-resources.h"
static const gchar *
get_ft_error (FT_Error error)
{
#undef __FTERRORS_H__
#define FT_ERRORDEF(e,v,s) case e: return s;
#define FT_ERROR_START_LIST
#define FT_ERROR_END_LIST
switch (error) {
#include FT_ERRORS_H
default:
return "unknown";
}
}
#define THUMB_SIZE 128
#define PADDING_VERTICAL 2
#define PADDING_HORIZONTAL 4
static gboolean
check_font_contain_text (FT_Face face,
const gchar *text)
{
gunichar *string;
glong len, idx, map;
FT_CharMap charmap;
gboolean retval;
string = g_utf8_to_ucs4_fast (text, -1, &len);
for (map = 0; map < face->num_charmaps; map++) {
charmap = face->charmaps[map];
FT_Set_Charmap (face, charmap);
retval = TRUE;
for (idx = 0; idx < len; idx++) {
gunichar c = string[idx];
if (!FT_Get_Char_Index (face, c)) {
retval = FALSE;
break;
}
}
if (retval)
break;
}
g_free (string);
return retval;
}
static gchar *
check_for_ascii_glyph_numbers (FT_Face face,
gboolean *found_ascii)
{
GString *ascii_string, *string;
gulong c;
guint glyph, found = 0;
string = g_string_new (NULL);
ascii_string = g_string_new (NULL);
*found_ascii = FALSE;
c = FT_Get_First_Char (face, &glyph);
do {
if (glyph == 65 || glyph == 97) {
g_string_append_unichar (ascii_string, (gunichar) c);
found++;
}
if (found == 2)
break;
g_string_append_unichar (string, (gunichar) c);
c = FT_Get_Next_Char (face, c, &glyph);
} while (glyph != 0);
if (found == 2) {
*found_ascii = TRUE;
g_string_free (string, TRUE);
return g_string_free (ascii_string, FALSE);
} else {
g_string_free (ascii_string, TRUE);
return g_string_free (string, FALSE);
}
}
static gchar *
build_fallback_thumbstr (FT_Face face)
{
gchar *chars;
gint idx, total_chars;
GString *retval;
gchar *ptr, *end;
gboolean found_ascii;
chars = check_for_ascii_glyph_numbers (face, &found_ascii);
if (found_ascii)
return chars;
idx = 0;
retval = g_string_new (NULL);
total_chars = g_utf8_strlen (chars, -1);
while (idx < 2) {
total_chars = (gint) floor (total_chars / 2.0);
ptr = g_utf8_offset_to_pointer (chars, total_chars);
end = g_utf8_find_next_char (ptr, NULL);
g_string_append_len (retval, ptr, end - ptr);
idx++;
}
return g_string_free (retval, FALSE);
}
int
main (int argc,
char **argv)
{
FT_Error error;
FT_Library library;
FT_Face face;
GFile *file;
gint font_size, thumb_size = THUMB_SIZE;
gchar *thumbstr_utf8 = NULL, *help, *uri;
gchar **arguments = NULL;
GOptionContext *context;
GError *gerror = NULL;
gchar *contents = NULL;
gboolean retval, default_thumbstr = TRUE;
gint rv = 1;
GdkRGBA black = { 0.0, 0.0, 0.0, 1.0 };
cairo_surface_t *surface;
cairo_t *cr;
cairo_text_extents_t text_extents;
cairo_font_face_t *font;
gchar *str = NULL;
gdouble scale, scale_x, scale_y;
gint face_index = 0;
gchar *fragment;
const GOptionEntry options[] = {
{ "text", 't', 0, G_OPTION_ARG_STRING, &thumbstr_utf8,
N_("Text to thumbnail (default: Aa)"), N_("TEXT") },
{ "size", 's', 0, G_OPTION_ARG_INT, &thumb_size,
N_("Thumbnail size (default: 128)"), N_("SIZE") },
{ G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &arguments,
NULL, N_("FONT-FILE OUTPUT-FILE") },
{ NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL }
};
#ifdef ENABLE_NLS
setlocale (LC_ALL, "");
bindtextdomain (GETTEXT_PACKAGE, MATELOCALEDIR);
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
textdomain (GETTEXT_PACKAGE);
#endif /* ENABLE_NLS */
context = g_option_context_new (NULL);
g_option_context_add_main_entries (context, options, GETTEXT_PACKAGE);
retval = g_option_context_parse (context, &argc, &argv, &gerror);
if (!retval) {
g_printerr ("Error parsing arguments: %s\n", gerror->message);
g_option_context_free (context);
g_error_free (gerror);
return 1;
}
if (!arguments || g_strv_length (arguments) != 2) {
help = g_option_context_get_help (context, TRUE, NULL);
g_printerr ("%s", help);
g_option_context_free (context);
goto out;
}
g_option_context_free (context);
if (thumbstr_utf8 != NULL)
default_thumbstr = FALSE;
error = FT_Init_FreeType (&library);
if (error) {
g_printerr("Could not initialise freetype: %s\n", get_ft_error (error));
goto out;
}
totem_resources_monitor_start (arguments[0], 30 * G_USEC_PER_SEC);
fragment = strrchr (arguments[0], '#');
if (fragment)
face_index = strtol (fragment + 1, NULL, 0);
file = g_file_new_for_commandline_arg (arguments[0]);
uri = g_file_get_uri (file);
g_object_unref (file);
face = sushi_new_ft_face_from_uri (library, uri, face_index, &contents, &gerror);
if (gerror) {
g_printerr ("Could not load face '%s': %s\n", uri,
gerror->message);
g_free (uri);
g_error_free (gerror);
goto out;
}
g_free (uri);
if (default_thumbstr) {
if (check_font_contain_text (face, "Aa"))
str = g_strdup ("Aa");
else
str = build_fallback_thumbstr (face);
} else {
str = thumbstr_utf8;
}
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
thumb_size, thumb_size);
cr = cairo_create (surface);
font = cairo_ft_font_face_create_for_ft_face (face, 0);
cairo_set_font_face (cr, font);
cairo_font_face_destroy (font);
font_size = thumb_size - 2 * PADDING_VERTICAL;
cairo_set_font_size (cr, font_size);
cairo_text_extents (cr, str, &text_extents);
if ((text_extents.width) > (thumb_size - 2 * PADDING_HORIZONTAL)) {
scale_x = (gdouble) (thumb_size - 2 * PADDING_HORIZONTAL) / (text_extents.width);
} else {
scale_x = 1.0;
}
if ((text_extents.height) > (thumb_size - 2 * PADDING_VERTICAL)) {
scale_y = (gdouble) (thumb_size - 2 * PADDING_VERTICAL) / (text_extents.height);
} else {
scale_y = 1.0;
}
scale = MIN (scale_x, scale_y);
cairo_scale (cr, scale, scale);
cairo_translate (cr,
PADDING_HORIZONTAL - text_extents.x_bearing + (thumb_size - scale * text_extents.width) / 2.0,
PADDING_VERTICAL - text_extents.y_bearing + (thumb_size - scale * text_extents.height) / 2.0);
gdk_cairo_set_source_rgba (cr, &black);
cairo_show_text (cr, str);
cairo_destroy (cr);
cairo_surface_write_to_png (surface, arguments[1]);
cairo_surface_destroy (surface);
totem_resources_monitor_stop ();
error = FT_Done_Face (face);
if (error) {
g_printerr("Could not unload face: %s\n", get_ft_error (error));
goto out;
}
error = FT_Done_FreeType (library);
if (error) {
g_printerr ("Could not finalize freetype library: %s\n",
get_ft_error (error));
goto out;
}
rv = 0; /* success */
out:
g_strfreev (arguments);
g_free (str);
g_free (contents);
return rv;
}
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