path: root/font-viewer/font-view.c

/* -*- mode: C; c-basic-offset: 4 -*- */

/*
 * font-view: a font viewer for MATE
 *
 * Copyright (C) 2002-2003  James Henstridge <james@daa.com.au>
 * Copyright (C) 2010 Cosimo Cecchi <cosimoc@gnome.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 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., 59 Temple - Place Suite 330, Boston, MA  02110-1301  USA
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_TYPE1_TABLES_H
#include FT_SFNT_NAMES_H
#include FT_TRUETYPE_IDS_H
#include <cairo/cairo-ft.h>
#include <gio/gio.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>

#include "ftstream-vfs.h"

static const gchar lowercase_text[] = "abcdefghijklmnopqrstuvwxyz";
static const gchar uppercase_text[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static const gchar punctuation_text[] = "0123456789.:,;(*!?')";

static void
draw_string (cairo_t *cr,
	     const gchar *text,
	     gint *pos_y)
{
    GdkColor black = { 0, 0, 0, 0 };
    cairo_text_extents_t extents;

    gdk_cairo_set_source_color (cr, &black);

    cairo_text_extents (cr, text, &extents);
    cairo_move_to (cr, 4, *pos_y);
    cairo_show_text (cr, text);

    *pos_y += extents.height + extents.y_advance + 4;
}

static gboolean
check_font_contain_text (FT_Face face, const gchar *text)
{
    while (text && *text) {
	    gunichar wc = g_utf8_get_char (text);

	    if (!FT_Get_Char_Index (face, wc))
		return FALSE;

	    text = g_utf8_next_char (text);
    }

    return TRUE;
}

static const gchar *
get_sample_string (FT_Face face)
{
    const gchar *text;

    text = pango_language_get_sample_string (NULL);

    if (!check_font_contain_text (face, text)) {
	text = pango_language_get_sample_string (pango_language_from_string ("en_US"));
    }

    return text;
}

static gint *
build_sizes_table (FT_Face face,
		   gint *n_sizes,
		   gint *alpha_size)
{
    gint *sizes = NULL;
    gint i;

    /* work out what sizes to render */
    if (FT_IS_SCALABLE (face)) {
	*n_sizes = 8;
	sizes = g_new (gint, *n_sizes);
	sizes[0] = 8;
	sizes[1] = 10;
	sizes[2] = 12;
	sizes[3] = 18;
	sizes[4] = 24;
	sizes[5] = 36;
	sizes[6] = 48;
	sizes[7] = 72;
	*alpha_size = 24;
    } else {
	/* use fixed sizes */
	*n_sizes = face->num_fixed_sizes;
	sizes = g_new (gint, *n_sizes);
	*alpha_size = 0;

	for (i = 0; i < face->num_fixed_sizes; i++) {
	    sizes[i] = face->available_sizes[i].height;

	    /* work out which font size to render */
	    if (face->available_sizes[i].height <= 24)
		*alpha_size = face->available_sizes[i].height;
	}
    }

    return sizes;
}

static void
realize_callback (GtkWidget *drawing_area,
		  FT_Face face)
{
    gint i, pixmap_width, pixmap_height;
    const gchar *text;
    cairo_text_extents_t extents;
    cairo_font_face_t *font;
    gint *sizes = NULL, n_sizes, alpha_size;
    cairo_t *cr;

    cr = gdk_cairo_create (gtk_widget_get_window (drawing_area));

    text = get_sample_string (face);
    sizes = build_sizes_table (face, &n_sizes, &alpha_size);

    /* calculate size of pixmap to use (with 4 pixels padding) ... */
    pixmap_width = 8;
    pixmap_height = 8;

    font = cairo_ft_font_face_create_for_ft_face (face, 0);
    cairo_set_font_face (cr, font);
    cairo_set_font_size (cr, alpha_size);
    cairo_font_face_destroy (font);

    cairo_text_extents (cr, lowercase_text, &extents);
    pixmap_height += extents.height + 4;
    pixmap_width = MAX (pixmap_width, 8 + extents.width);

    cairo_text_extents (cr, uppercase_text, &extents);
    pixmap_height += extents.height + 4;
    pixmap_width = MAX (pixmap_width, 8 + extents.width);

    cairo_text_extents (cr, punctuation_text, &extents);
    pixmap_height += extents.height + 4;
    pixmap_width = MAX (pixmap_width, 8 + extents.width);

    pixmap_height += 8;

    for (i = 0; i < n_sizes; i++) {
	cairo_set_font_size (cr, sizes[i]);
	cairo_text_extents (cr, text, &extents);
	pixmap_height += extents.height + 4;
	pixmap_width = MAX (pixmap_width, 8 + extents.width);
    }

    gtk_widget_set_size_request (drawing_area, pixmap_width, pixmap_height);

    cairo_destroy (cr);
    g_free (sizes);
}

static void
draw (GtkWidget *drawing_area,
      cairo_t *cr,
      FT_Face face)
{
    cairo_font_extents_t font_extents;
    gint *sizes = NULL, n_sizes, alpha_size, pos_y, i;
    const gchar *text;
    cairo_font_face_t *font;

    text = get_sample_string (face);
    sizes = build_sizes_table (face, &n_sizes, &alpha_size);

    font = cairo_ft_font_face_create_for_ft_face (face, 0);
    cairo_set_font_face (cr, font);
    cairo_font_extents (cr, &font_extents);
    cairo_font_face_destroy (font);

    /* draw text */
    pos_y = MAX (font_extents.height, 32) + 4;
    cairo_set_font_size (cr, alpha_size);
    draw_string (cr, lowercase_text, &pos_y);
    draw_string (cr, uppercase_text, &pos_y);
    draw_string (cr, punctuation_text, &pos_y);

    pos_y += 8;
    for (i = 0; i < n_sizes; i++) {
	cairo_set_font_size (cr, sizes[i]);
	draw_string (cr, text, &pos_y);
    }

    g_free (sizes);
}

#if GTK_CHECK_VERSION (3, 0, 0)
static void
draw_callback (GtkWidget *drawing_area,
	       cairo_t *cr,
	       FT_Face face)
{
    draw (drawing_area, cr, face);
}
#else
static void
expose_callback (GtkWidget *drawing_area,
		 GdkEventExpose *event,
		 FT_Face face)
{
    cairo_t *cr = gdk_cairo_create (event->window);
    draw (drawing_area, cr, face);
    cairo_destroy (cr);
}
#endif

static void
#if GTK_CHECK_VERSION (3, 4, 0)
add_row (GtkWidget *grid,
#else
add_row (GtkWidget *table,
	 gint *row_p,
#endif
	 const gchar *name,
	 const gchar *value,
	 gboolean multiline,
	 gboolean expand)
{
    gchar *bold_name;
    GtkWidget *name_w;

    bold_name = g_strconcat ("<b>", name, "</b>", NULL);
    name_w = gtk_label_new (bold_name);
    g_free (bold_name);
    gtk_misc_set_alignment (GTK_MISC (name_w), 0.0, 0.0);
    gtk_label_set_use_markup (GTK_LABEL (name_w), TRUE);

#if GTK_CHECK_VERSION (3, 4, 0)
    gtk_container_add (GTK_CONTAINER (grid), name_w);
#else
    gtk_table_attach (GTK_TABLE(table), name_w, 0, 1, *row_p, *row_p + 1,
		      GTK_FILL, GTK_FILL, 0, 0);
#endif

    if (multiline) {
	GtkWidget *label, *viewport;
	GtkScrolledWindow *swin;
        guint flags;

        label = gtk_label_new (value);
        gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
        gtk_label_set_selectable (GTK_LABEL (label), TRUE);
        gtk_widget_set_size_request (label, 200, -1);
        gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.0);

        swin = GTK_SCROLLED_WINDOW (gtk_scrolled_window_new (NULL, NULL));
        gtk_scrolled_window_set_policy (swin,
					GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);

        viewport = gtk_viewport_new (gtk_scrolled_window_get_hadjustment (swin),
                                     gtk_scrolled_window_get_vadjustment (swin));
        gtk_viewport_set_shadow_type (GTK_VIEWPORT (viewport), GTK_SHADOW_NONE);

        gtk_container_add (GTK_CONTAINER (swin), viewport);
#if GTK_CHECK_VERSION (3, 4, 0)
        if (expand) {
            gtk_widget_set_hexpand (GTK_WIDGET (swin), TRUE);
            gtk_widget_set_vexpand (GTK_WIDGET (swin), TRUE);
        }

        gtk_container_add_with_properties (GTK_CONTAINER (grid), GTK_WIDGET (swin),
                                           "width", 2,
                                           NULL);
#else
        (*row_p)++;

        if (expand)
          flags = GTK_FILL | GTK_EXPAND;
        else
          flags = GTK_FILL;

        gtk_table_attach (GTK_TABLE (table), GTK_WIDGET (swin),
			  0, 2, *row_p, *row_p + 1,
			  GTK_FILL | GTK_EXPAND, flags, 0, 0);
#endif

        gtk_container_add (GTK_CONTAINER (viewport), label);
    } else {
        GtkWidget *label = gtk_label_new (value);
        gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
        gtk_label_set_selectable (GTK_LABEL(label), TRUE);
#if GTK_CHECK_VERSION (3, 4, 0)
        gtk_grid_attach_next_to (GTK_GRID (grid), label,
                                 name_w, GTK_POS_RIGHT,
                                 1, 1);
    }
#else
        gtk_table_attach (GTK_TABLE (table), label,
			  1, 2, *row_p, *row_p + 1,
			  GTK_FILL | GTK_EXPAND, GTK_FILL, 0, 0);
    }

    (*row_p)++;
#endif
}

static void
#if GTK_CHECK_VERSION (3, 4, 0)
add_face_info (GtkWidget *grid,
#else
add_face_info (GtkWidget *table,
	       gint *row_p,
#endif
	       const gchar *uri,
	       FT_Face face)
{
    gchar *s;
    GFile *file;
    GFileInfo *info;
    PS_FontInfoRec ps_info;

#if GTK_CHECK_VERSION (3, 4, 0)
    add_row (grid, _("Name:"), face->family_name, FALSE, FALSE);
#else
    add_row (table, row_p, _("Name:"), face->family_name, FALSE, FALSE);
#endif

    if (face->style_name)
#if GTK_CHECK_VERSION (3, 4, 0)
	add_row (grid, _("Style:"), face->style_name, FALSE, FALSE);
#else
	add_row (table, row_p, _("Style:"), face->style_name, FALSE, FALSE);
#endif

    file = g_file_new_for_uri (uri);
    info = g_file_query_info (file,
                              G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE ","
                              G_FILE_ATTRIBUTE_STANDARD_SIZE,
                              G_FILE_QUERY_INFO_NONE,
                              NULL, NULL);
    g_object_unref (file);

    if (info != NULL) {
        s = g_content_type_get_description (g_file_info_get_content_type (info));
#if GTK_CHECK_VERSION (3, 4, 0)
        add_row (grid, _("Type:"), s, FALSE, FALSE);
#else
        add_row (table, row_p, _("Type:"), s, FALSE, FALSE);
#endif
        g_free (s);

        s = g_format_size (g_file_info_get_size (info));
#if GTK_CHECK_VERSION (3, 4, 0)
        add_row (grid, _("Size:"), s, FALSE, FALSE);
#else
        add_row (table, row_p, _("Size:"), s, FALSE, FALSE);
#endif
        g_free (s);

        g_object_unref (info);
    }

    if (FT_IS_SFNT (face)) {
	gint i, len;
	gchar *version = NULL, *copyright = NULL, *description = NULL;

	len = FT_Get_Sfnt_Name_Count (face);
	for (i = 0; i < len; i++) {
	    FT_SfntName sname;

	    if (FT_Get_Sfnt_Name (face, i, &sname) != 0)
		continue;

	    /* only handle the unicode names for US langid */
	    if (!(sname.platform_id == TT_PLATFORM_MICROSOFT &&
		  sname.encoding_id == TT_MS_ID_UNICODE_CS &&
		  sname.language_id == TT_MS_LANGID_ENGLISH_UNITED_STATES))
		continue;

	    switch (sname.name_id) {
	    case TT_NAME_ID_COPYRIGHT:
		g_free (copyright);
		copyright = g_convert ((gchar *)sname.string, sname.string_len,
				       "UTF-8", "UTF-16BE", NULL, NULL, NULL);
		break;
	    case TT_NAME_ID_VERSION_STRING:
		g_free (version);
		version = g_convert ((gchar *)sname.string, sname.string_len,
				     "UTF-8", "UTF-16BE", NULL, NULL, NULL);
		break;
	    case TT_NAME_ID_DESCRIPTION:
		g_free (description);
		description = g_convert ((gchar *)sname.string, sname.string_len,
					 "UTF-8", "UTF-16BE", NULL, NULL, NULL);
		break;
	    default:
		break;
	    }
	}
	if (version) {
#if GTK_CHECK_VERSION (3, 4, 0)
	    add_row (grid, _("Version:"), version, FALSE, FALSE);
#else
	    add_row (table, row_p, _("Version:"), version, FALSE, FALSE);
#endif
	    g_free (version);
	}
	if (copyright) {
#if GTK_CHECK_VERSION (3, 4, 0)
	    add_row (grid, _("Copyright:"), copyright, TRUE, TRUE);
#else
	    add_row (table, row_p, _("Copyright:"), copyright, TRUE, TRUE);
#endif
	    g_free (copyright);
	}
	if (description) {
#if GTK_CHECK_VERSION (3, 4, 0)
	    add_row (grid, _("Description:"), description, TRUE, TRUE);
#else
	    add_row (table, row_p, _("Description:"), description, TRUE, TRUE);
#endif
	    g_free (description);
	}
    } else if (FT_Get_PS_Font_Info (face, &ps_info) == 0) {
	if (ps_info.version && g_utf8_validate (ps_info.version, -1, NULL))
#if GTK_CHECK_VERSION (3, 4, 0)
	    add_row (grid, _("Version:"), ps_info.version, FALSE, FALSE);
#else
	    add_row (table, row_p, _("Version:"), ps_info.version, FALSE, FALSE);
#endif
	if (ps_info.notice && g_utf8_validate (ps_info.notice, -1, NULL))
#if GTK_CHECK_VERSION (3, 4, 0)
	    add_row (grid, _("Copyright:"), ps_info.notice, TRUE, FALSE);
#else
	    add_row (table, row_p, _("Copyright:"), ps_info.notice, TRUE, FALSE);
#endif
    }
}

static void
set_icon (GtkWindow *window,
	  const gchar *uri)
{
    GFile *file;
    GIcon *icon;
    GFileInfo *info;
    GdkScreen *screen;
    GtkIconTheme *icon_theme;
    const gchar *icon_name = NULL, *content_type;

    screen = gtk_widget_get_screen (GTK_WIDGET (window));
    icon_theme = gtk_icon_theme_get_for_screen (screen);

    file = g_file_new_for_uri (uri);
    info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
                              G_FILE_QUERY_INFO_NONE, NULL, NULL);
    g_object_unref (file);

    if (info == NULL)
	return;

    content_type = g_file_info_get_content_type (info);
    icon = g_content_type_get_icon (content_type);

    if (G_IS_THEMED_ICON (icon)) {
       const gchar * const *names = NULL;

       names = g_themed_icon_get_names (G_THEMED_ICON (icon));
       if (names) {
          gint i;
          for (i = 0; names[i]; i++) {
	      if (gtk_icon_theme_has_icon (icon_theme, names[i])) {
		  icon_name = names[i];
		  break;
	      }
          }
       }
    }

    if (icon_name) {
        gtk_window_set_icon_name (window, icon_name);
    }

    g_object_unref (icon);
}

static void
font_install_finished_cb (GObject      *source_object,
                          GAsyncResult *res,
                          gpointer      data)
{
    GError *err = NULL;

    g_file_copy_finish (G_FILE (source_object), res, &err);

    if (!err) {
        gtk_button_set_label (GTK_BUTTON (data), _("Installed"));
    } else {
        gtk_button_set_label (GTK_BUTTON (data), _("Install Failed"));
        g_debug ("Install failed: %s", err->message);
        g_error_free (err);
    }

    gtk_widget_set_sensitive (GTK_WIDGET (data), FALSE);
}

static void
install_button_clicked_cb (GtkButton *button,
                           const gchar *font_file)
{
    GFile *src, *dest;
    gchar *dest_path, *dest_filename;
    GError *err = NULL;

    /* first check if ~/.fonts exists */
    dest_path = g_build_filename (g_get_home_dir (), ".fonts", NULL);
    if (!g_file_test (dest_path, G_FILE_TEST_EXISTS)) {
        GFile *f = g_file_new_for_path (dest_path);
        g_file_make_directory_with_parents (f, NULL, &err);
        g_object_unref (f);
        if (err) {
            /* TODO: show error dialog */
            g_warning ("Could not create fonts directory: %s", err->message);
            g_error_free (err);
            g_free (dest_path);
            return;
        }
    }
    g_free (dest_path);

    /* create destination filename */
    src = g_file_new_for_uri (font_file);

    dest_filename = g_file_get_basename (src);
    dest_path = g_build_filename (g_get_home_dir (), ".fonts", dest_filename,
				  NULL);
    g_free (dest_filename);

    dest = g_file_new_for_path (dest_path);

    /* TODO: show error dialog if file exists */
    g_file_copy_async (src, dest, G_FILE_COPY_NONE, 0, NULL, NULL, NULL,
                       font_install_finished_cb, button);

    g_object_unref (src);
    g_object_unref (dest);
    g_free (dest_path);
}

int
main (int argc,
      char **argv)
{
    FT_Error error;
    FT_Library library;
    FT_Face face;
    GFile *file;
    gchar *font_file, *title;
    gint row;
#if GTK_CHECK_VERSION (3, 4, 0)
    GtkWidget *window, *hbox, *grid, *swin, *drawing_area;
#else
    GtkWidget *window, *hbox, *table, *swin, *drawing_area;
#endif
    GdkColor white = { 0, 0xffff, 0xffff, 0xffff };
    GtkWidget *button, *align;

    bindtextdomain (GETTEXT_PACKAGE, MATELOCALEDIR);
    bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
    textdomain (GETTEXT_PACKAGE);

    gtk_init (&argc, &argv);

    if (argc != 2) {
	g_printerr (_("Usage: %s fontfile\n"), argv[0]);
	return 1;
    }

    error = FT_Init_FreeType (&library);
    if (error) {
	g_printerr("Could not initialise freetype\n");
	return 1;
    }

    file = g_file_new_for_commandline_arg (argv[1]);
    font_file = g_file_get_uri (file);
    g_object_unref (file);

    if (!font_file) {
	g_printerr("Could not parse argument into a URI\n");
	return 1;
    }

    error = FT_New_Face_From_URI (library, font_file, 0, &face);
    if (error) {
	g_printerr("Could not load face '%s'\n", font_file);
	return 1;
    }

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    title = g_strconcat (face->family_name,
			 face->style_name ? ", " : "",
			 face->style_name, NULL);
    gtk_window_set_title (GTK_WINDOW (window), title);
    set_icon (GTK_WINDOW (window), font_file);
    g_free (title);
    gtk_window_set_resizable (GTK_WINDOW (window), TRUE);

#if GTK_CHECK_VERSION (3, 2, 0)
    hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
#else
    hbox = gtk_hbox_new (FALSE, 0);
#endif
    gtk_container_add (GTK_CONTAINER (window), hbox);

    swin = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swin),
				    GTK_POLICY_AUTOMATIC, GTK_POLICY_NEVER);
    gtk_box_pack_start (GTK_BOX (hbox), swin, TRUE, TRUE, 0);

    drawing_area = gtk_drawing_area_new ();
    gtk_widget_modify_bg (drawing_area, GTK_STATE_NORMAL, &white);
    gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (swin),
					   drawing_area);
    g_signal_connect (drawing_area, "realize",
		      G_CALLBACK (realize_callback), face);
#if GTK_CHECK_VERSION (3, 0, 0)
    g_signal_connect (drawing_area, "draw",
		      G_CALLBACK (draw_callback), face);
#else
    g_signal_connect (drawing_area, "expose-event",
		      G_CALLBACK (expose_callback), face);
#endif

    /* set the minimum size on the scrolled window to prevent
     * unnecessary scrolling */
    /* 800 is better for GtkGrid */
#if GTK_CHECK_VERSION (3, 4, 0)
    gtk_widget_set_size_request (swin, 800, -1);
#else
    gtk_widget_set_size_request (swin, 500, -1);
#endif

    g_signal_connect (window, "destroy",
		      G_CALLBACK (gtk_main_quit), NULL);

#if GTK_CHECK_VERSION (3, 4, 0)
    grid = gtk_grid_new ();
    gtk_orientable_set_orientation (GTK_ORIENTABLE (grid), GTK_ORIENTATION_VERTICAL);
    gtk_container_set_border_width (GTK_CONTAINER (grid), 5);
    gtk_box_pack_start (GTK_BOX (hbox), grid, FALSE, TRUE, 0);

    add_face_info (grid, font_file, face);
#else
    table = gtk_table_new (1, 2, FALSE);
    gtk_container_set_border_width (GTK_CONTAINER (table), 5);
    gtk_box_pack_start (GTK_BOX (hbox), table, FALSE, TRUE, 0);

    row = 0;
    add_face_info (table, &row, font_file, face);
#endif

    /* add install button */
    align = gtk_alignment_new (1.0, 0.5, 0.0, 0.0);
#if GTK_CHECK_VERSION (3, 4, 0)
    gtk_widget_set_hexpand (align, TRUE);
    gtk_container_add_with_properties (GTK_CONTAINER (grid), align,
                                       "width", 2,
                                       NULL);
#else
    gtk_table_attach (GTK_TABLE (table), align, 0, 2, row, row + 1,
                      GTK_FILL | GTK_EXPAND, GTK_FILL, 0, 0);
#endif

    button = gtk_button_new_with_mnemonic (_("I_nstall Font"));
    g_signal_connect (button, "clicked",
                      G_CALLBACK (install_button_clicked_cb), font_file);
    gtk_container_add (GTK_CONTAINER (align), button);

#if GTK_CHECK_VERSION (3, 4, 0)
    gtk_grid_set_column_spacing (GTK_GRID (grid), 8);
    gtk_grid_set_row_spacing (GTK_GRID (grid), 2);
#else
    gtk_table_set_col_spacings (GTK_TABLE (table), 8);
    gtk_table_set_row_spacings (GTK_TABLE (table), 2);
#endif
    gtk_widget_show_all (window);

    gtk_main ();

    return 0;
}