Re: Display grayscale image
On 8/30/07, Marco Brambilla [EMAIL PROTECTED] wrote: Hello everybody, Firs of all I'm a newbye both to GTK and to this mailing list, so I apologize for the triviality of the post. I'm writing a very simple application (language: C) which should grab frames from a ccd camera and show them on the screen. The ccd images are stored as a 1D array of unsigned char, single channel grayscale images. Looking around inside the API docs, I tried to use something like: pixbuf = gtk_pixbuf_new_from_data(.); image = gtk_image_new_from_pixbuf(pixbuf); The problem is that this way, the displayed image is messed up, since (for what I understand) gtk_pixbuf_new_from_data needs the three RGB channels. Is there a easy way of displaying such an image as is (single channel) ? Or must I convert it each pixel to the a RGB triplet needed by gtk_pixbuf_new_from_data ? Any advice is very welcome. Thanks in advance to everybody. Marco You could possibly use gdk_image, but it's easier to use a pixbuf and just copy the grayscale value thrice into R, G and B. Remember to use the rowstride, and not the width of the image when creating a pointer to go from one row to the next. -Jim ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Display grayscale image
On 8/31/07, Jim George [EMAIL PROTECTED] wrote: On 8/30/07, Marco Brambilla [EMAIL PROTECTED] wrote: Is there a easy way of displaying such an image as is (single channel) ? Or must I convert it each pixel to the a RGB triplet needed by gtk_pixbuf_new_from_data ? You could possibly use gdk_image, but it's easier to use a pixbuf and just copy the grayscale value thrice into R, G and B. Remember to use Another option (though a little harder) is to make a GtkDrawingArea, connect to the expose signal, and use gdk_draw_gray_image() to paint the damaged area from your stored 1-channel image. It ought to be quite a bit faster. John ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
libglade problems under win32
Hello all, now that Glade-3 has entered into Debian testing repositories, it's time for me to abandon the (long time) deprecated code generation and definetely switch over to libglade. The porting of application on which I'm currently working has been quite straightforward under Linux; problems are arising when trying to run the app - built with MSVC - under WinXP. In more detail, I have at run time the following warnings: 1. a lot of: libglade-WARNING **: unknown widget class ... 2. a lot of: libglade-WARNING **: could not find signal handler ... I have already managed to solve the signal handler warning under Linux, by means of -export-dynamic linker flags, but I have no idea on how to solve above issues under win32. Any clue? TIA, Carlo ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
How to convert a jpg image to a GtkImage ?
Hi all, I have an application, that amoung other things, is receiving a jpg file from a network connection. Once that file is in memory (it's relatively small), I wish to load it into a GtkImage (so that I can display it, e.g. by adding the GtkImage to a vbox, or something like that). I've been thru the Dev Help pages, and I have some questions: 1) If the image were in an actual file, I could load it e.g. with gtk_image_new_from_file(). It's not intuitive to me which function to use to load my in memory file into a GtkImage, and I am reluctant to save the image to a file, just to load it, and then delete the file... 2) I'm seeing the following fnctions, and, well, I'm confused. I see GtkImage the related gtk_image functions. I see GdkPixbuf the related gdk_pixbuf functions. I see GtkPixmap the related gtk_pixmap functions. When do I use which ? (and in order to display my jpg image in a v/h-box, is GtkImage really the proper widget to use ?) Many thanks in advance, -Greg -- +-+ Please also check the log file at /dev/null for additional information. (from /var/log/Xorg.setup.log) | Greg Hosler [EMAIL PROTECTED]| +-+ ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: libglade problems under win32
carlo wrote: Hello all, now that Glade-3 has entered into Debian testing repositories, it's time for me to abandon the (long time) deprecated code generation and definetely switch over to libglade. The porting of application on which I'm currently working has been quite straightforward under Linux; problems are arising when trying to run the app - built with MSVC - under WinXP. In more detail, I have at run time the following warnings: 1. a lot of: libglade-WARNING **: unknown widget class ... 2. a lot of: libglade-WARNING **: could not find signal handler ... I have already managed to solve the signal handler warning under Linux, by means of -export-dynamic linker flags, but I have no idea on how to solve above issues under win32. You need -export-dynamic, but you should also mark the signal function prototypes with G_MODULE_EXPORT: G_MODULE_EXPORT gboolean exit_cb(GtkWidget *widget, GdkEvent *event, gpointer data); Oh, yes, Windows sucks. -- It's God. No, not Richard Stallman, or Linus Torvalds, but God. (By Matt Welsh) Eduardo M KALINOWSKI [EMAIL PROTECTED] http://move.to/hpkb ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
How to compile and link GTK2 Programms tobe compatibe with XFree86 and Xorg
Hello I changed my developping system now the system openSuse uses Xorg the old system used XFree86 Installed gtk 2.8 or Building the exexutable now libraries from Xorg are included like libXfixes.so.3 org LivXinarema.so.1 or libglitz.so.1 the executeable does not run under systems using XFree86 because auf missing lib. Is there a compiler or linker switch to tell only to use compatible calls. In simple examples like Hello World the libXfixes.so.3 is not include this example runs under XFree86. For linking I have to set -lgtk-x11-2.0 without all gtk calls are refrenced as undefined symbols in linking. Or may be I have to build my own gtk,gdk,glib,cairo,pango,atk libs with special settings? I hope there will be a possibility to build gtk programms under newer Distibutions also runable under older Distributions. Installing firefox under the older Distributions makes no problems and i guess this is gtk applikation too. Who knows about. Thanks for help. mfg g.rapp -- R=I+S Rapp Informatik Systeme GmbH Rosenbühlstr. 24 D-89182 Bernstadt Tel: +49 (0)7348-7755 Fax: +49 (0)7348-6086 E-MAIL mailto: [EMAIL PROTECTED] WEB www.rapp-informatik.de PS: Senden Sie mir bitte keine Anhänge in Microsoft (.DOC, .PPT) Format Bitte lesen Sie http://www.fsf.org/philosophy/no-word-attachmentsi.de.html Please don't send me any attachment in Microsoft (.DOC, .PPT) format please Read http://www.fsf.org/philosophy/no-word-attachments.html ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Simple question - accelerator keys
Hi, I am currently trying to figure out something simillar. Unfortunately it seems that accelerators are only used for menues in most applications. If you check gnome-bugzilla - it has several open bugs for accelerators. I recently fixed one and right now prepared a test program for another. Lets try to track those down and propose fixes. Stefan Tomasz Sałaciński wrote: Hi there, Is there a possibility to simply bind a window-global accelerator key to a callback function? I am writing a GTK+ media player and I want to bind Left and Right arrow keys to seek media and F key to toggle fullscreen. I know that I can use gtk_widget_add_accelerator(), but then I have to create a new signal, which is, let's say, not so easy for me:) Cheers, Tom ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
How to detect display speed in custom widget?
Hi, I'm wondering if anybody is experienced in writing smart widget that would react differently depending on whether the current display is local/fast for graphics animation or remote/slow where all animation should be kept to the minimum? What techniques are suitable for drawing speed detection? Thanks. -- Daniel. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: How to compile and link GTK2 Programms tobe compatibe with XFree86 and Xorg
David Nečas (Yeti) wrote: On Fri, Aug 31, 2007 at 10:21:52PM +0200, [EMAIL PROTECTED] wrote: I changed my developping system now the system openSuse uses Xorg the old system used XFree86 Installed gtk 2.8 or Building the exexutable now libraries from Xorg are included like libXfixes.so.3 org LivXinarema.so.1 or libglitz.so.1 the executeable does not run under systems using XFree86 because auf missing lib. snip I hope there will be a possibility to build gtk programms under newer Distibutions also runable under older Distributions. You are looking for LSB (which is probably not perfect, but it could be as good as you can get -- in my opinion, anyway): http://www.linux-foundation.org/en/LSB https://lists.linux-foundation.org/pipermail/lsb-discuss/. -- Daniel Yek. Installing firefox under the older Distributions makes no problems and i guess this is gtk applikation too. Mozilla builds with old libraries, IIRC they build on something as ancient as RedHat 8. To produce executables that run with library version X or newer build with library version X (assuming backward compatibility) -- to ensure your program actually works with version X, you need to build and test it with this version anyway (can be done for instance on a virtual machine). The other possibility is to dlopen everything -- generally fragile. The third possibility is to bundle the libraries -- probably not an option with X. Yeti ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: How to convert a jpg image to a GtkImage ?
Gregory Hosler wrote: Hi all, I have an application, that amoung other things, is receiving a jpg file from a network connection. Once that file is in memory (it's relatively small), I wish to load it into a GtkImage (so that I can display it, e.g. by adding the GtkImage to a vbox, or something like that). I've been thru the Dev Help pages, and I have some questions: 1) If the image were in an actual file, I could load it e.g. with gtk_image_new_from_file(). It's not intuitive to me which function to use to load my in memory file into a GtkImage, and I am reluctant to save the image to a file, just to load it, and then delete the file... 2) I'm seeing the following fnctions, and, well, I'm confused. I see GtkImage the related gtk_image functions. I see GdkPixbuf the related gdk_pixbuf functions. I see GtkPixmap the related gtk_pixmap functions. When do I use which ? (and in order to display my jpg image in a v/h-box, is GtkImage really the proper widget to use ?) My first impulse is that you will need to drag libjpeg into this (pretty standard everywhere) and delegate image decoding over to that module. Then create a new image in memory with gdk_image_new() and copy the decoded RGB data over. -- -Mike Melanson ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: How to convert a jpg image to a GtkImage ?
On Fri, Aug 31, 2007 at 02:11:15PM -0700, Mike Melanson wrote: I have an application, that amoung other things, is receiving a jpg file from a network connection. Once that file is in memory (it's relatively small), I wish to load it into a GtkImage (so that I can display it, e.g. by adding the GtkImage to a vbox, or something like that). ... My first impulse is that you will need to drag libjpeg into this (pretty standard everywhere) and delegate image decoding over to that module. Then create a new image in memory with gdk_image_new() and copy the decoded RGB data over. No, explicit use of libjpeg is not necessary. Create a GdkPixbufLoader, feed the in-memory image date to it with gdk_pixbuf_loader_write() and if everything is all right fetch the GdkPixbuf from it. Then construct the GtkImage with gtk_image_new_from_pixbuf(). Yeti -- http://gwyddion.net/ ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
