Font antialiasing on X (was: Re: Font Contrast)
MEA-Mike.Friedrichs wrote: This may be the wrong place, but since I have a question about Gnome, which is built with GTK+, I may be in the right place. I have installed Novell's Suse 10.0 and having problems getting the font to show their true colors and sharpness on the edges. When I pick the font color to be black on a white back ground, the black always shows some gray tones, and ragged on the edges. I've tried as black as I am allowed but always ends up with gray tones. There must be some setting that allows me to get good clean black characters. By, the way I'm using *.ttf fonts. I've also imported the fonts from my XP machine, this was an recommendation, but not the solution. This question is related to rather generic X-Windows behaviour and neither to Gnome nor GTK+ nor application programming, indeed. For instance, the same applies to QT-based applications (KDE). Anyway: The font rendering effect you're referring to is called antialiasing. It's meant to make fonts appear smoother on screen, especially at small sizes or low screen resolutions, by using intermediate colours at the edges. The same effect basically takes place on MS-Windows font rendering and in nearly all modern 3D games, btw. While this effect is considered an improvement of display quality by the majority of users, some users may not like it or there may be some situations (certain fonts at certain sizes) when antialiasing seems not appropriate and may rather worsen the appearance. Hence, the effect can be turned off. In X-Windows it's nowadays controlled by the Xft + Fontconfig library. Unfortunately AFAIK there is no way to thoroughly configure use of antialiasing via Gnome, so you will likely have to edit the config file manually. The advantage of doing so is, that you can not only turn on or off antialiasing entirely, but also enable or disable it for particular fonts at particular sizes and such stuff. The file to edit should be /etc/fonts/font.conf. It's an XML file, so you may need some basic knowledge about XML to understand it. Unfortunately it has a rather complex (I'd say: bloated) structure, so it may not be easy to understand. Anyway, you can turn off antialiasing entirely by inserting a statement like this: match target=font edit name=antialias mode=assignboolfalse/bool/edit /match For further information see also: http://en.wikipedia.org/wiki/Font_rasterization http://en.wikipedia.org/wiki/Antialias http://www.fontconfig.org/fontconfig-user.html http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x-fonts.html http://keithp.com/~keithp/talks/xtc2001/paper/ ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Font antialiasing on X (was: Re: Font Contrast)
On 2/13/06, Gus Koppel [EMAIL PROTECTED] wrote: Hence, the effect can be turned off. In X-Windows it's nowadays controlled by the Xft + Fontconfig library. Unfortunately AFAIK there is no way to thoroughly configure use of antialiasing via Gnome, so you will likely have to edit the config file manually. GNOME does have some GUI for font rendering configuration: it might be worth trying that (if you haven't) before attacking the XML config files. Click System / Preferences / Font, then try selecting Best contrast. If you click Details ... you can change some more settings, such as RGB order and hinting. John ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Threads/IPC/???
Ed Kutrzyba wrote: I am developing an application that controls a Data Collection System. I used glade and anjuta for my GUI and C backend control coding. My program works great, but I need to add some extra backround tasks: 1) I need to run a script (perl or bash) on demand without interfering with my program. i.e. the script runs in the background so GTK is still responsive. This should be what you're looking for: http://developer.gnome.org/doc/API/2.0/glib/glib-Spawning-Processes.html#g-spawn-async 2) I need to spawn a task to perform some background operations. i.e. get time from an add in board, arm and disarm an interrupt routine that time tags an external signal -- need to start and stop this on demand. On linux, usually we implement hardware abstraction at the kernel module level, so your interrupt handleing stuff should usually not be in user-space; assuming this is all setup; you can interface with a kernel driver's file desctiptor like any other; check for read/write conditions with GIOChannel/GIOWatch. Cheers, -Tristan ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Sockets with GTK 2.8.9 on WIN32
Daniel Atallah wrote: That is one of the changes that were made in Glib 2.8.x. All of the win32 GIOChannel stuff was changed such that it'll leave your sockets in non-blocking mode. See this bug report for more information: http://bugzilla.gnome.org/show_bug.cgi?id=147392 This seems very strange for me since glib 2.8 on Unix does not behave this way. How can GTK be used as a multiplatform development system if it behave in different ways for the different platform it supports? Basically, if you want your socket to be non-blocking, you have to make it so in the input function every time it is triggered. So I've to add something like this in my input function (error checking omitted): #ifdef WIN32 unsigned long par = 0; ioctlsocket(fd, FIONBIO, par); #endif This is quite ugly. I thought that I had seen this in the documentation somewhere, but apparently not. I've not found anything related to GLIB 2.6 - 2.8 differences at least at: http://www.gtk.org/api/ (incompatible differences seems related to 2.0 - 2.2 migration) Bye, Gabry ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Threads/IPC/???
Ed Kutrzyba wrote: I am developing an application that controls a Data Collection System. I used glade and anjuta for my GUI and C backend control coding. My program works great, but I need to add some extra backround tasks: 1) I need to run a script (perl or bash) on demand without interfering with my program. i.e. the script runs in the background so GTK is still responsive. http://developer.gnome.org/doc/API/2.0/glib/glib-Spawning-Processes.html#g-spawn-async 2) I need to spawn a task to perform some background operations. i.e. get time from an add in board, arm and disarm an interrupt routine that time tags an external signal -- need to start and stop this on demand. What is the best way to do this? http://developer.gnome.org/doc/API/2.0/glib/glib-Spawning-Processes.html#g-spawn-async-with-pipes In general, see: http://developer.gnome.org/doc/API/2.0/glib/glib-Spawning-Processes.html I have some code from the vendor to control the add in board, I just need to massage it to fit into my app, my way. See also: http://mail.gnome.org/archives/gtk-app-devel-list/2004-April/msg00171.html ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Sockets with GTK 2.8.9 on WIN32
Gabriele Greco writes: This seems very strange for me since glib 2.8 on Unix does not behave this way. Well, Windows isn't Unix, so is it really that surprising that some things are fundamentally different? With hindsight it's easy to say that the affected APIs and abstractions in GLib should perhaps have been designed differently so that any Unix/Windows differences could have been better hidden. But, we have to make use of what we have now. Actually, I think that the original thoughts were that the affected GLib APIs (GPollFDs, GMainLoop, etc) could have been much more platform specific. Owen says in bug #120299: I don't think usage and contents of GPollFD needs to be or should be portable across Win32/Unix, though changing how it works is probably an API change on Win32. My original conception was that GMainLoop would be significantly different on different operating systems, though GPollFD * crept into more of the API (g_main_context_query()) for GTK+-2.x. That many things then turned out to be implementable on Windows without requiring ifdefs in GLib-using code was an unexpected positive surprise. Or something like that... How can GTK be used as a multiplatform development system if it behave in different ways for the different platform it supports? You just have to take those things that behave differently into account in your code. Trust me, the implementation of watched GIOChannels for sockets on Windows in GLib before 2.8 had a wholly different and more serious set of problems and Unix/Windows differences. Those caused a lot of problems when porting various GNOME platform libraries to Windows. See discussion for instance in bugs #120299 and #147392. In the old implementation there was a separate thread running per watched socket. So I've to add something like this in my input function (error checking omitted): #ifdef WIN32 unsigned long par = 0; ioctlsocket(fd, FIONBIO, par); #endif Actually I don't think that will work. As long as a socket is being watched (it has an event selection for it (WSAEventSelect()) in force) you cannot turn the non-blockingness off. Anyway, as you use GLib mainloop functionality and watched GIOchannels in the first place, isn't your intention to avoid blocking calls in your code? You perhaps want to handle reading requests from and sending replies to multiple sockets in parallel with minimum delay? Otherwise you could just use blocking recv() and send() all the time without bothering with GIOChannels and GMainLoops, couldn't you? So shouldn't you be using non-blocking mode on Unix, too, then? Aren't you otherwise just knowing your recv()/send() calls won't block (because they never do in your test environment), and when they then occasionally *do* block, perhaps indefinitely, in the end-user environment, you are in trouble? I've not found anything related to GLIB 2.6 - 2.8 differences at least at: http://www.gtk.org/api/ Yeah, the documentation needs to have a mention about it added. --tml ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
gtk+ application on Cygwin for Windows
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi guys, I am developing an GTK2+ application on cygwin for win32. Lets us not discuss about the code as its complied sucessfully. 1. I used -mms-bitfields 2. I used -mno-cygwin 3. All packages has been installed on cygwin, i am using `pkg- config --cflags --libs gtk+-2.0` - -L/usr/X11R6/lib -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf- 2.0 -lpangoxft-1.0 -lXft -lfreetype -lz -lXrender -lXext - lfontconfig -lpangox-1.0 -lX11 -lpango-1.0 -lm -lgobject-2.0 - lgmodule-2.0 -lglib-2.0 -lintl -liconv Code has complied sucessfully, but when i am trying to execute this file .. i am getting a Sorry for incon. windows has encountered unknow error. AppName: gtkapp.exe AppVer: 0.0.0.0 ModName: cygwin1.dll ModVer: 1005.19.0.0 Offset: 000136eb This application is working fine with X-Server on Cygwin. Any Help from your guys are appericiated. Ciao - Regards, Deepak Thukral http://niecdelhi.com/~deepak/ -BEGIN PGP SIGNATURE- Note: This signature can be verified at https://www.hushtools.com/verify Version: Hush 2.4 wkYEARECAAYFAkPvNjQACgkQndbxsd4OgL/bwQCfUcRZidVoINr5LrQT8h575JNpY48A n0Xowq3TfFEnyMIj04rahFPZtfJn =d/Kl -END PGP SIGNATURE- Concerned about your privacy? Instantly send FREE secure email, no account required http://www.hushmail.com/send?l=480 Get the best prices on SSL certificates from Hushmail https://www.hushssl.com?l=485 ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Refreshing gtk window without any mouse/keyboard intervention
Hi,
We are trying to create a gtk application which should run without much of
manual intervention. Few buttons are placed in a row and each button has
an image at the top which changes to red on selection. This image changes
to green when the button goes out of selection. So the whole process has
to be done in a scan mode without any manual intervention.
The problem with our code (attached with this mail) is that the events are
generated and the callback functions are called. But the window is not
refreshed properly. The window gets updated only when there is any
mouse/keyboard movement.
Thanks in Advance,
Regards
Nisha
---
Nisha P Kurur
DON Lab (BSB 328)
Dept. of CSE
IITM, Chennai - 36
Phone (044) 2257 5364/9804/9853
--#include common.h
GtkWidget *window;
GtkWidget *table;
GtkWidget *button[9];
GtkWidget *image_enable[9];
static void button_pressed_callback(GtkWidget *widget, GdkEvent *event,
gpointer image);
static void button_released_callback(GtkWidget *widget, GdkEvent *event,
gpointer image);
void button_selection();
/* Create a new hbox with an image and a label packed into it
* and return the box. */
static GtkWidget *xpm_label_box(gchar *label_text, gchar *xpm_filename)
{
GtkWidget *box;
GtkWidget *label;
GtkWidget *image;
/* Create box for image and label */
box = gtk_vbox_new (FALSE, 0);
gtk_container_set_border_width (GTK_CONTAINER (box), 2);
/* Now on to the image stuff */
image = gtk_image_new_from_file (xpm_filename);
/* Create a label for the button */
label = gtk_label_new (label_text);
/* Pack the image and label into the box */
gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 3);
gtk_box_pack_start (GTK_BOX (box), image, FALSE, FALSE, 3);
gtk_widget_show (label);
gtk_widget_show (image);
return box;
}
/*
static void hiding_showing_images(GtkWidget *widget, gint index)
{
GtkWidget *image;
// guint index = (guint *)img;
g_print(INDEX = %d, FLAG = %d \n,index ,flag);
if(flag == 1)
{
g_print(INSIDE LEAVE\n);
gtk_widget_hide(image_enable[index-1]);
image = gtk_image_new_from_file(radio_green.jpg);
gtk_table_attach_defaults (GTK_TABLE (table), image, index-1,
index, 0, 1);
gtk_widget_show (image);
image_enable[index-1] = image;
flag = 0;
}
else
{
g_print(INSIDE ENTER\n);
gtk_widget_hide(image_enable[index-1]);
image = gtk_image_new_from_file(radio_red.jpg);
gtk_table_attach_defaults (GTK_TABLE (table), image, index-1,
index, 0, 1);
gtk_widget_show (image);
image_enable[index-1] = image;
flag = 1;
}
}
*/
/* Callback method */
static void button_released_callback(GtkWidget *widget, GdkEvent *event,
gpointer img)
{
GtkWidget *image;
guint index = (guint *)img;
g_print(INSIDE LEAVE\n);
gtk_widget_hide(image_enable[index-1]);
image = gtk_image_new_from_file(radio_green.jpg);
gtk_table_attach_defaults (GTK_TABLE (table), image, index-1, index, 0,
1);
gtk_widget_show (image);
image_enable[index-1] = image;
}
static void button_pressed_callback(GtkWidget *widget, GdkEvent *event,
gpointer img)
{
GtkWidget *image;
guint index = (guint *)img;
g_print(INSIDE ENTER\n);
gtk_widget_hide(image_enable[index-1]);
image = gtk_image_new_from_file(radio_red.jpg);
gtk_table_attach_defaults (GTK_TABLE (table), image, index-1, index, 0,
1);
gtk_widget_show (image);
image_enable[index-1] = image;
}
static GtkWidget *create_button(guint index)
{
GtkWidget *box;
GtkWidget *button;
GtkWidget *image;
image = gtk_image_new_from_file(radio_green.jpg);
button = gtk_button_new();
switch(index)
{
case 1:
{
box = xpm_label_box( ABC , soccer.gif);
gtk_container_add (GTK_CONTAINER (button), box);
gtk_table_attach_defaults (GTK_TABLE (table), button, 0, 1, 1, 2);
gtk_table_attach_defaults (GTK_TABLE (table), image, 0, 1, 0, 1);
image_enable[0] = image;
g_signal_connect(G_OBJECT(button), button_press_event,
G_CALLBACK (button_pressed_callback), (gpointer)index);
g_signal_connect(G_OBJECT(button), button_release_event,
G_CALLBACK(button_released_callback), (gpointer)index);
break;
}
case 2:
{
box = xpm_label_box( DEF , soccer.gif);
gtk_container_add (GTK_CONTAINER (button), box);
GdkEventClient? How can I get client messages from X?
Is there an event mask or something that needs to be set to get client messages from the X server? I'm trying to get client messages from X with the Atom _NET_STARTUP_INFO. I tried registering a filter with gdk_add_client_message_filter: gdk_add_client_message_filter(gdk_atom_intern(_NET_STARTUP_INFO,FALSE), my_filter_func, NULL); I can see the filter get added to the display, and I can see the message broadcast using xmon or the libstartup-notification test-watch-xmessages, but I never get into the callback. Any direction or insight would be greatly appreciated. . . Regards ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Refreshing gtk window without any mouse/keyboard intervention
Nisha P Kurur wrote: We are trying to create a gtk application which should run without much of manual intervention. Few buttons are placed in a row and each button has an image at the top which changes to red on selection. This image changes to green when the button goes out of selection. So the whole process has to be done in a scan mode without any manual intervention. The problem with our code (attached with this mail) is that the events are generated and the callback functions are called. But the window is not refreshed properly. The window gets updated only when there is any mouse/keyboard movement. 1. using the sleep() function in a GUI application is very bad programming style by all means, even if taking place in a custom thread. It's a relict of shell programming. You should rather use gtk_timeout_add() or g_timeout_add(). Probably you can even do without multiple threads then, which may avoid some hard to find bugs in the future and makes debugging much easier. See: http://developer.gnome.org/doc/API/2.0/gtk/gtk-General.html#gtk-timeout-add http://developer.gnome.org/doc/API/2.0/glib/glib-The-Main-Event-Loop.html#g-timeout-add 2. you have to make sure that GTK+ can pass through its main loop for changes to be drawn. In a single-threaded application this would have to happen after your g_signal_emit_by_name() calls. See: http://developer.gnome.org/doc/API/2.0/gtk/gtk-General.html#gtk-main-iteration-do 3. you probably know that the switch-case tree of your example is bloated, i.e. contains much redundancy which could (and probably should) be avoided. Of 7 statements, 3 are completely identical and the other ones could be unified by simply using your index variable instead of distinct constants to pass to the respective functions. Add a little list of const strings for the xpm_label_box() call and you can do completely without a switch-case, that is, with only 1 instead of 9 blocks of that code. Golden rule of programming: _never_ use the copy paste feature of your text editor for more than three or four lines of code, especially not multiple times! Write sub functions (or in this case: just restructure a code block) instead. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: gtk+ application on Cygwin for Windows
Deepak Thukral writes: I am developing an GTK2+ application on cygwin for win32. You mean you don't want the application to use Cygwin? OK. 2. I used -mno-cygwin Yep. 3. All packages has been installed on cygwin, Bad move. What you have installed is apparently a Cygwin/X11 build of GTK+. - -L/usr/X11R6/lib -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf- 2.0 -lpangoxft-1.0 -lXft -lfreetype -lz -lXrender -lXext - lfontconfig -lpangox-1.0 -lX11 -lpango-1.0 -lm -lgobject-2.0 - lgmodule-2.0 -lglib-2.0 -lintl -liconv As you see above, you are linking with the Cygwin GTK for X11, and various Cygwin X libraries. This is very contradictory with using -mno-cygwin. This application is working fine with X-Server on Cygwin. Any Help from your guys are appericiated. You need to install the GTK+, Pango, atk and GLib developer and run-time packages for Win32. Go to ftp://ftp.gtk.org/pub/gtk/v2.8/win32/ . Remember to get the dependencies, too. The .pc files included in the above packages are supposed to be used with the Win32 port of pkg-config, which automatically translates the prefix usd in a .pc file into the one where the package that includes the .pc file is installed. (For this to work you should not move .pc files out from where they are after unzipping. Instead, set up a PKG_CONFIG_PATH if necessary.) If you use them with the Cygwin pkg-config, you will have to manually edit them so the prefix matches the path where you installed the packages. --tml ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
