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wireshark/ui/gtk/font_utils.c

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/* font_utils.c
* Utilities to use for font manipulation
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#ifdef _WIN32
#include <windows.h>
#include <tchar.h>
#include <wsutil/unicode-utils.h>
#endif
#include "ui/recent.h"
#include "ui/simple_dialog.h"
#include "ui/gtk/main.h"
#include "ui/gtk/gtkglobals.h"
#include "ui/gtk/font_utils.h"
#include "ui/gtk/packet_panes.h"
#include "ui/gtk/follow_stream.h"
#include "ui/gtk/packet_list.h"
static PangoFontDescription *m_r_font;
/* Get the regular user font.
*
* @return the regular user font
*/
PangoFontDescription *user_font_get_regular(void)
{
return m_r_font;
}
static void
set_fonts(PangoFontDescription *regular)
{
/* Yes, assert. The code that loads the font should check
* for NULL and provide its own error message. */
g_assert(m_r_font);
m_r_font = regular;
}
void
view_zoom_in_cb(GtkWidget *w _U_, gpointer d _U_)
{
gint save_gui_zoom_level;
save_gui_zoom_level = recent.gui_zoom_level;
recent.gui_zoom_level++;
switch (user_font_apply()) {
case FA_SUCCESS:
break;
case FA_ZOOMED_TOO_FAR:
recent.gui_zoom_level = save_gui_zoom_level; /* undo zoom */
break;
case FA_FONT_NOT_AVAILABLE:
/* We assume this means that the specified size isn't available. */
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"Your current font isn't available in the next larger size.\n");
recent.gui_zoom_level = save_gui_zoom_level; /* undo zoom */
break;
}
}
void
view_zoom_out_cb(GtkWidget *w _U_, gpointer d _U_)
{
gint save_gui_zoom_level;
save_gui_zoom_level = recent.gui_zoom_level;
recent.gui_zoom_level--;
switch (user_font_apply()) {
case FA_SUCCESS:
break;
case FA_ZOOMED_TOO_FAR:
recent.gui_zoom_level = save_gui_zoom_level; /* undo zoom */
break;
case FA_FONT_NOT_AVAILABLE:
/* We assume this means that the specified size isn't available. */
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"Your current font isn't available in the next smaller size.\n");
recent.gui_zoom_level = save_gui_zoom_level; /* undo zoom */
break;
}
}
void
view_zoom_100_cb(GtkWidget *w _U_, gpointer d _U_)
{
gint save_gui_zoom_level;
save_gui_zoom_level = recent.gui_zoom_level;
recent.gui_zoom_level = 0;
switch (user_font_apply()) {
case FA_SUCCESS:
break;
case FA_ZOOMED_TOO_FAR:
recent.gui_zoom_level = save_gui_zoom_level; /* undo zoom */
break;
case FA_FONT_NOT_AVAILABLE:
/* We assume this means that the specified size isn't available.
XXX - this "shouldn't happen". */
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"Your current font couldn't be reloaded at the size you selected.\n");
recent.gui_zoom_level = save_gui_zoom_level; /* undo zoom */
break;
}
}
gboolean
user_font_test(gchar *font_name)
{
PangoFontDescription *new_r_font;
new_r_font = pango_font_description_from_string(font_name);
if (new_r_font == NULL) {
/* Oops, that font didn't work.
Tell the user, but don't tear down the font selection
dialog, so that they can try again. */
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"The font you selected can't be loaded.");
return FALSE;
}
return TRUE;
}
/* Given a font name, construct the name of a version of that font with
the current zoom factor applied. */
static char *
font_zoom(char *gui_font_name)
{
char *new_font_name;
char *font_name_dup;
char *font_name_p;
long font_point_size_l;
if (recent.gui_zoom_level == 0) {
/* There is no zoom factor - just return the name */
return g_strdup(gui_font_name);
}
font_name_dup = g_strdup(gui_font_name);
/* find the start of the font_size string */
font_name_p = strrchr(font_name_dup, ' ');
*font_name_p = '\0';
font_name_p++;
/* calculate the new font size */
font_point_size_l = strtol(font_name_p, NULL, 10);
font_point_size_l += recent.gui_zoom_level;
/* make sure the size didn't become zero or negative */
if (font_point_size_l <= 0)
return NULL;
/* build a new font name */
new_font_name = g_strdup_printf("%s %ld", font_name_dup, font_point_size_l);
g_free(font_name_dup);
return new_font_name;
}
fa_ret_t
user_font_apply(void) {
char *gui_font_name;
PangoFontDescription *new_r_font;
PangoFontDescription *old_r_font = NULL;
/* convert font name to reflect the zoom level */
gui_font_name = font_zoom(prefs.gui_gtk2_font_name);
if (gui_font_name == NULL)
return FA_ZOOMED_TOO_FAR;
/* load normal font */
new_r_font = pango_font_description_from_string(gui_font_name);
if (new_r_font == NULL) {
g_free(gui_font_name);
/* We let our caller pop up a dialog box, as the error message
depends on the context (did they zoom in or out, or did they
do something else? */
return FA_FONT_NOT_AVAILABLE;
}
/* the font(s) seem to be ok */
packet_list_set_font(new_r_font);
set_ptree_font_all(new_r_font);
old_r_font = m_r_font;
set_fonts(new_r_font);
/* Redraw the packet bytes windows. */
redraw_packet_bytes_all();
/* Redraw the "Follow TCP Stream" windows. */
follow_stream_redraw_all();
/* We're no longer using the old fonts; unreference them. */
if (old_r_font != NULL)
pango_font_description_free(old_r_font);
g_free(gui_font_name);
return FA_SUCCESS;
}
#ifdef _WIN32
#define NAME_BUFFER_LEN 32
static char appfontname[128] = "tahoma 8";
static void
set_app_font_gtk2(const char *fontname)
{
GtkSettings *settings;
if (fontname != NULL && *fontname == 0) return;
settings = gtk_settings_get_default();
if (fontname == NULL) {
g_object_set(G_OBJECT(settings), "gtk-font-name", appfontname, NULL);
} else {
GtkWidget *w;
PangoFontDescription *pfd;
PangoContext *pc;
PangoFont *pfont;
w = gtk_label_new(NULL);
pfd = pango_font_description_from_string(fontname);
pc = gtk_widget_get_pango_context(w);
pfont = pango_context_load_font(pc, pfd);
if (pfont != NULL) {
g_strlcpy(appfontname, fontname, 128);
appfontname[127] = '\0';
g_object_set(G_OBJECT(settings), "gtk-font-name", appfontname, NULL);
}
gtk_widget_destroy(w);
pango_font_description_free(pfd);
}
}
static char *default_windows_menu_fontspec_gtk2(void)
{
gchar *fontspec = NULL;
NONCLIENTMETRICS ncm;
memset(&ncm, 0, sizeof ncm);
ncm.cbSize = sizeof ncm;
if (SystemParametersInfo(SPI_GETNONCLIENTMETRICS, ncm.cbSize, &ncm, 0)) {
HDC screen = GetDC(0);
double y_scale = 72.0 / GetDeviceCaps(screen, LOGPIXELSY);
int point_size = (int) (ncm.lfMenuFont.lfHeight * y_scale);
if (point_size < 0) point_size = -point_size;
fontspec = g_strdup_printf("%s %d", ncm.lfMenuFont.lfFaceName,
point_size);
ReleaseDC(0, screen);
}
return fontspec;
}
static void try_to_get_windows_font_gtk2(void)
{
gchar *fontspec;
fontspec = default_windows_menu_fontspec_gtk2();
if (fontspec != NULL) {
int match;
PangoFontDescription *pfd;
PangoFont *pfont;
PangoContext *pc;
GtkWidget *w;
pfd = pango_font_description_from_string(fontspec);
w = gtk_label_new(NULL);
pc = gtk_widget_get_pango_context(w);
pfont = pango_context_load_font(pc, pfd);
match = (pfont != NULL);
pango_font_description_free(pfd);
g_object_unref(G_OBJECT(pc));
gtk_widget_destroy(w);
if (match) set_app_font_gtk2(fontspec);
g_free(fontspec);
}
}
#endif /* _WIN32 */
void font_init(void)
{
#ifdef _WIN32
/* try to load the application font for GTK2 */
try_to_get_windows_font_gtk2();
#endif
/* Try to load the regular fixed-width font */
m_r_font = pango_font_description_from_string(prefs.gui_gtk2_font_name);
if (m_r_font == NULL) {
/* XXX - pop this up as a dialog box? no */
fprintf(stderr, "wireshark: Warning: font %s not found - defaulting to Monospace 9\n",
prefs.gui_gtk2_font_name);
if ((m_r_font = pango_font_description_from_string("Monospace 9")) == NULL)
{
fprintf(stderr, "wireshark: Error: font Monospace 9 not found\n");
exit(1);
}
g_free(prefs.gui_gtk2_font_name);
prefs.gui_gtk2_font_name = g_strdup("Monospace 9");
}
/* Call this for the side-effects that set_fonts() produces */
set_fonts(m_r_font);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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