Using bitmaps with Symbian and Maemo Platforms

This article compares the task of using bitmaps on Symbian and Maemo/MeeGo platforms. It is part of the series Comparing S60 and Maemo Platforms.

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Article

Created: ebra (19 Nov 2007)

Last edited: hamishwillee (13 Jun 2012)

Tip: Application developers should use Qt rather than the native APIs listed below.

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Reasons: hamishwillee (17 Nov 2011)
Article incomplete - the description of MeeGo has no comments, and the explanation for Symbian is empty. Also Qt is the application development framework for both platforms, and this should also be demonstrated.

Maemo Platform

/* create image */
GdkImage* create_image(GdkPixmap* pixmap,GdkDrawable* drawable,gint W,gint H,gint X,gint Y)
{
    GdkImage* image1 = NULL;
    GdkImage* image2 = NULL;
    guint32 ref, pixel;
    gint i,j;
 
    image1 = gdk_drawable_copy_to_image(pixmap,NULL,0,0,0,0,W,H);
    image2 = gdk_drawable_copy_to_image(drawable,NULL,X,Y,0,0,W,H);
 
    ref = gdk_image_get_pixel(image1,0,0);
 
    for ( i=0; i<W; i++ )
    for ( j=1; j<H; j++ )
    {
        pixel = gdk_image_get_pixel(image1,i,j);
        if ( pixel != ref ) gdk_image_put_pixel(image2,i,j,pixel);
    }
    g_object_unref(image1);
    return image2;
}

/* redraw */
void callback_redraw (GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
...
    GdkPixmap* pixmap = NULL;
    ...
 
                pixmap = mainview->pixmaps[index].pixmap;
                if ( pixmap!=NULL )
                {
                    gdk_drawable_get_size(pixmap, &width, &height); 
                    if ( spacing(mainview->pixmaps[index].utf_category) ) 
                    {
                        total_width += width;
                    }
                    else
                    { 
                        X = mainview->drawing_area->allocation.width - total_width +
                               mainview->X + mainview->pixmaps[index].X;
                        Y = mainview->Y + i * ROW_HEIGHT + mainview->pixmaps[index].Y;
 
                        image = create_image(pixmap,widget->window,width,height,X,Y); 
 
                        gdk_draw_image(widget->window,gc,image,0,0,X,Y,-1,-1);
 
                        g_object_unref(image);
                    }  
                } 
...
}