~ubuntu-branches/ubuntu/trusty/imagination/trusty-updates

/*

 *  Copyright (c) 2009 Tadej Borovšak   <tadeboro@gmail.com>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License,or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU Library General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not,write to the Free Software

 *  Foundation,Inc.,59 Temple Place - Suite 330,Boston,MA 02111-1307,USA.

 *

 */

 

#include <gdk/gdk.h>

 

void img_transition_set_name(gchar **name)

{

        *name = "Wave Down";

}

 

void img_transition_render(GdkDrawable *window, GdkPixbuf *image_from, GdkPixbuf *image_to, gdouble progress, gint file_desc)

{

        cairo_t *cr;

        cairo_surface_t *surface;

        cairo_pattern_t *pattern;

        gint    width, height;

        gdouble wave_factor = 1.07;     // 50px

        gdouble stop;

 

        gdk_drawable_get_size(window, &width, &height);

 

        if(file_desc < 0)

        {

                cr = gdk_cairo_create(window);

        }

        else

        {

                surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);

                cr = cairo_create(surface);

        }

 

        gdk_cairo_set_source_pixbuf(cr,image_from,0,0);

        cairo_paint(cr);

 

        gdk_cairo_set_source_pixbuf(cr,image_to,0,0);

        pattern = cairo_pattern_create_linear( width / 2, 0, width / 2, height );

        /* Add color stops */

        cairo_pattern_add_color_stop_rgba(pattern, (1 - wave_factor) / 2, 0, 0, 0, 1 ); // start

 

        stop = progress * wave_factor - ( wave_factor - 1 );

        cairo_pattern_add_color_stop_rgba(pattern, stop, 0, 0, 0, 1 );

 

        stop = progress * wave_factor;

        cairo_pattern_add_color_stop_rgba(pattern, stop, 0, 0, 0, 0 );

 

        cairo_pattern_add_color_stop_rgba(pattern, wave_factor, 0, 0, 0, 0 ); // stop

 

        cairo_mask(cr, pattern);

        cairo_destroy(cr);

        cairo_pattern_destroy(pattern);

        

        if(file_desc < 0)

                return;

 

        img_export_cairo_to_ppm(surface, file_desc);

        cairo_surface_destroy(surface);

}