Re: Can't copy the right image from window

[Tigran Piloyan <tigran piloyan gmail com>]

Please use this command to build

gcc `pkg-config --cflags gtk+-2.0 --libs gtk+-2.0 glib-2.0 gthread-2.0` app_name.c

On Wed, Jun 16, 2010 at 12:35 PM, Tigran Piloyan <tigran piloyan gmail com> wrote:

Hi, i tried to copy from the GdkWindow an image with the function gdk_drawable_copy_to_image() but everytime i get different images under Ubuntu with gnome, in KDE it allways copied the right image .  I tried to set USE_XFT = 0 to disable antialiasing, but it didn't help.


#include <gtk/gtk.h>
#include <glib.h>
#include <stdio.h>

int main (int argc, char **argv)
{
    GdkWindow *window = NULL;
    GdkWindowAttr attr;
    GdkRectangle rectangle;
    GdkColormap *colormap = NULL;
    GdkImage *image = NULL;
    GdkGC *gc = NULL;
    GdkColor color;
    GError *err = NULL;
    gchar *buffer;
    gsize count;
    GdkPixbuf *pixbuf = NULL;
   
    gtk_init(&argc, &argv);
   
    colormap = gdk_colormap_get_system();
    if(colormap == NULL)
    {
        printf("Unable to create a GdkColormap,gdk_colormap_get_system returns NULL.");
        return 1;
    }
   
    rectangle.x = 0;
    rectangle.y = 0;
    rectangle.width = 300;
    rectangle.height = 300;
   
    attr.title = "Window";
    attr.x = 0;
    attr.y = 0;
    attr.width = 500;
    attr.height = 600;
    attr.wclass = GDK_INPUT_OUTPUT;
    attr.window_type = GDK_WINDOW_TOPLEVEL;
   
    window = gdk_window_new(NULL, &attr, GDK_WA_X | GDK_WA_Y |GDK_WA_TITLE);
    if(window == NULL)
    {
        printf("The gdk_window_new function returned NULL, unable to create GdkWindow.");
        return 1;
    }
   
    gdk_window_show(window);
    gdk_flush();
    sleep(3);
   
    gc = gdk_gc_new(window);
    if(gc == NULL)
    {
        printf("Unable to create a GdkGC, gdk_gc_new returns NULL.");
        return 1;
    }   
   
    color.red = 100 * (65535 / 255);
    color.green = 50 * (65535 / 255);
    color.blue = 100 * (65535 / 255);
   
    gdk_gc_set_rgb_fg_color(gc, &color);
   
    gdk_window_begin_paint_rect(window, &rectangle);
    gdk_draw_rectangle(window, gc, TRUE, 0, 0, 200, 200);
    gdk_window_end_paint(window);
   
    image = gdk_drawable_copy_to_image(window, NULL, 0, 0, 0, 0, attr.width, attr.height);
    if(image == NULL)
    {
        printf("Unable to create a GdkImage, gdk_drawable_copy_to_image returns NULL.");
        return 1;
    }
   
    pixbuf = gdk_pixbuf_get_from_image (NULL, image, colormap, 0, 0, 0, 0, attr.width, attr.height);
    if(pixbuf == NULL)
    {
        printf("Unable to create a GdkPixbuf, gdk_pixbuf_get_from_image returns NULL.");
        return 1;
    }
       
    gdk_pixbuf_save_to_buffer (pixbuf, &buffer, &count, "jpeg", &err, "quality", "100", NULL);
                                               
    gdk_pixbuf_save(pixbuf, "window_image.jpg", "jpeg", &err, "quality", "100", NULL);
   
    sleep(3);
   
    return 0;
}




The image saved in window_image.jpg doesn't match with drawn on window image
--
Tigran Piloyan

Linux Verification Center, ISPRAS, RAU
web:    http://www.linuxtesting.org
e-mail: tigran piloyan linuxtesting org

-- 
Tigran Piloyan

Linux Verification Center, ISPRAS, RAU
web:    http://www.linuxtesting.org
e-mail: tigran piloyan linuxtesting org