Hi,
This is not entirely related, but if you are familiar with OpenGL
you could use GtkGLExt (http://gtkglext.sourceforge.net/) to create
a OpenGL drawable context and then display the images using simple
OpenGL textures or something... Just an idea though.
Daniel
On Sun, 2005-05-15 at 10:50 +0300, [EMAIL PROTECTED] wrote:
> Hi.
> In the past, I wrote a program ( in DOS), to display a
> signal collected from ADC. I use 2 video pages - 1 is
> visible, second is hidden (to draw), and switch they very
> fast. The result is very smooth animated graphic. Now i try
> to convert my program on Linux. But the picture isn't very
> good. The graphic start blinking. Becouse my program is too
> large, I write some little example to show my idea:
>
> #include <gtk/gtk.h>
>
> #define WIDTH 300
> #define HEIGHT 300
>
> guchar buf[WIDTH * HEIGHT * 3];
>
> gboolean on_expose(GtkWidget *widget, GdkEventExpose *event,
> gpointer user_data)
> {
> gdk_draw_rgb_image (widget->window,
> widget->style->fg_gc[GTK_STATE_NORMAL],
> 0, 0, WIDTH, HEIGHT, GDK_RGB_DITHER_NONE,
> buf, WIDTH * 3);
> return FALSE;
> }
>
> /* In real program this function collect data from ADC */
> gint timeout_func(gpointer data)
> {
> int x, y;
> gchar *pos;
> int size = WIDTH * 3 * (HEIGHT - 1);
>
> memmove(buf,buf + WIDTH * 3, size); /* move image 1
> line up */
> pos = buf + (HEIGHT-1) * WIDTH * 3; /* last line start
> position */
>
> for(x=0;x<WIDTH;x++) /* fill last line with random */
> {
> y = rand(); /* simulate ADC
> reading - only to test */
> *pos++ = y;
> *pos++ = y;
> *pos++ = y;
> }
> gtk_widget_queue_draw(GTK_WIDGET(data)); /* draw image on
> screen */
> return TRUE;
> }
>
> int main(int argc, char *argv[])
> {
> guint handler;
> GtkWidget *window;
> GtkWidget *draw_area;
>
> gtk_init(&argc, &argv);
> gdk_rgb_init();
>
> window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> gtk_widget_push_visual(gdk_rgb_get_visual());
> gtk_widget_push_colormap(gdk_rgb_get_cmap());
> draw_area = gtk_drawing_area_new();
> gtk_widget_pop_visual();
> gtk_widget_pop_colormap();
>
> gtk_drawing_area_size( GTK_DRAWING_AREA(draw_area),
> WIDTH, HEIGHT);
> gtk_container_add(GTK_CONTAINER (window), draw_area);
> gtk_signal_connect(GTK_OBJECT(window), "destroy",
> GTK_SIGNAL_FUNC(gtk_exit), NULL);
> gtk_signal_connect(GTK_OBJECT(draw_area), "expose-event",
> GTK_SIGNAL_FUNC (on_expose), NULL);
> gtk_widget_show_all (window);
>
> /* set timeout function - 20 times per second */
> handler = g_timeout_add(1000/20, timeout_func, draw_area);
>
> gtk_main();
>
> g_source_remove(handler);
> }
>
> Are someone idea what is wrong? My compter is 1Ghz Epia-M
> 10000 , and I thing - it's enought powerfull. I can see
> movies with totem with no problem (no blinking, no loss
> frames). Maybe gdk_draw_rbg_image isn't too fast? Or maybe
> there is another way to change a big picture on display?
>
>
> Thanks
>
> -----------------------------
>
> * ÐÐÐÐÐ ÐÐÐÑÑ ÑÐÐÐ, ÐÐÐÑÐ ÐÑÐÐÑÑ ÐÐÑÐ Ð
> ÐÑÐÐÐÑÐ? (ÐÐÑÐ, ÐÐÐÑÐ ÐÐÐ ÐÐ ÐÐÐÐÑÐ ÐÐ
> ÐÐÑÑÐÑÐ)
> * ÐÐÐ ÐÐÐ-ÐÑÑÐÐ ÐÐ ÐÑÐÐÑÑÐÐÐ ÑÐÐÑÐ ÑÐ Ð
> ÐÐÑÐÐÐ ÐÐ ÐÐÑÐ? (ÐÐÐÑÐÐÐÑ ÐÐ ÐÐÐÐÑÑÐÐÐÐÐÑ
> ÑÐÐÑ)
> * ÐÐÐÐÐÐÐ: ÐÐÐÐÐÐÐÐÐÐ ÑÑÐÐÑÐÐ ÐÑÑÑ "ÐÑÐÐÐÐ
> ÐÐ Ð-ÐÐÐÐÐÑÐ"-ÑÐÑÑ 1 ( 21 ÐÐÐ, ÐÑ.ÐÐÑÐÑ,
> ÐÐÑÐÐÐÑÐÐÐ ÐÐÑÑÐ)
> http://lifeconsult.info/?mbg_m
>
> _______________________________________________
> 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
