re : GtkImage and GtkPixmap programming

["VijayaKumar S. Kale" <vsk telco co in>]

What I have uderstood from your mail is that,
you want to copy a region of one gtkpixmap/gtkimage say x,y,w,h. and
copy it on another gtkpixmap/gtkimage at x1,y1 and width and height
same as
copied region.

If that is the case it should work.

1. first make GdkPixmap/GdkImage of the selected region.

2. use
            void gdk_draw_pixmap  (      GdkDrawable *drawable,
                                                                            //gdkwindow of first gtkpixmap
                                                         GdkGC *gc,
                                                         GdkDrawable  *src, //gdkpixmap of copied
                                                                                                region.
                                                          gint  xsrc,
                                                          gint  ysrc,
                                                          gint  xdest,
                                                          gint  ydest,
                                                          gint  width,
                                                          gint  height  );

OR

        void gdk_draw_image  (    GdkDrawable  *drawable,
                                                                //gdkwindow of first gtkpixmap
                                                 GdkGC        *gc,
                                                 GdkImage  *image,     //gdkpixmap of copied
                                                                                                region
                                                 gint  xsrc,
                                                 gint  ysrc,
                                                 gint  xdest,
                                                 gint  ydest,
                                                 gint  width,
                                                 gint  height  );
 

 to draw/copy selected gdkpixmap/gdkimage. where  GdkDrawable  *drawable is
GdkWindow of  GtkPixmap/GtkImage where you want to put copied region.

3. But this will get erased on redraw / expose / resize.  You have to handle this drawing on redraw / expose / resize of second gtkpixmap also.

-- 

Simon Brenner wrote :

I am making an application where I want the user to be able to select an area
 of a GtkPixmap/Image and then put it on an other GtkPixmap/Image. How would I do
 it?
I have made code for selecting area, and where to put it on the other
 Pixmap/Image.

I've tried taking the Pixmap of my GtkPixmap widget with gtk_pixmap_get(), and
 then use the Gdk drawing primitives to put my other pixmap on it, but nothing
 appears on the screen.

I have pulled my hair for a couple of days now and I've read the Gtk and Gdk
 manuals, but they're not very comprehensive, and I couldn't find any clues.

---------------------------------------------------------------------
        VIJAYKUMAR S. KALE
ESG, TTIL, Telco Campus,PUNE - 411 018
email:  vskale telco co in
phone:  (off.)  +91-212-7402049 (Direct)
                +91-212-7402947 (Direct)
        (resi.) +91-212-4358085
----------------------------------------------------------------------
~

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