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/*
* Copyright (c) 2009 Giuseppe Torelli <colossus73@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 <cairo.h>
#include <glib.h>
/* Local functions declarations */
static void
transition_render( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction );
/* Plug-in API */
void
img_get_plugin_info( gchar **group,
gchar ***trans )
{
gint i = 0;
*group = "Push Wipe";
*trans = g_new( gchar *, 13 );
(*trans)[i++] = "From Left";
(*trans)[i++] = "img_from_left";
(*trans)[i++] = GINT_TO_POINTER( 26 );
(*trans)[i++] = "From Right";
(*trans)[i++] = "img_from_right";
(*trans)[i++] = GINT_TO_POINTER( 27 );
(*trans)[i++] = "From Top";
(*trans)[i++] = "img_from_top";
(*trans)[i++] = GINT_TO_POINTER( 28 );
(*trans)[i++] = "From Bottom";
(*trans)[i++] = "img_from_bottom";
(*trans)[i++] = GINT_TO_POINTER( 29 );
(*trans)[i++] = NULL;
}
void img_from_left( cairo_t *cr, cairo_surface_t *image_from, cairo_surface_t *image_to, gdouble progress )
{
transition_render( cr, image_from, image_to, progress, 1 );
}
void img_from_right( cairo_t *cr, cairo_surface_t *image_from, cairo_surface_t *image_to, gdouble progress )
{
transition_render( cr, image_from, image_to, progress, 2 );
}
void img_from_top( cairo_t *cr, cairo_surface_t *image_from, cairo_surface_t *image_to, gdouble progress )
{
transition_render( cr, image_from, image_to, progress, 3 );
}
void img_from_bottom( cairo_t *cr, cairo_surface_t *image_from, cairo_surface_t *image_to, gdouble progress )
{
transition_render( cr, image_from, image_to, progress, 4 );
}
/* Local functions definitions */
static void
transition_render( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
gint width, height;
width = cairo_image_surface_get_width( image_from );
height = cairo_image_surface_get_height( image_from );
switch (direction)
{
case 1:
cairo_set_source_surface(cr,image_to,-width * (1- progress),0);
break;
case 2:
cairo_set_source_surface(cr,image_from,-width * progress,0);
break;
case 3:
cairo_set_source_surface(cr,image_from,0,height * progress);
break;
case 4:
cairo_set_source_surface(cr,image_from,0,-height * progress);
break;
}
cairo_paint( cr );
switch (direction)
{
case 1:
cairo_set_source_surface(cr,image_from,width * progress,0);
break;
case 2:
cairo_set_source_surface(cr,image_to,width * (1 - progress),0);
break;
case 3:
cairo_set_source_surface(cr,image_to,0,-height * (1 - progress));
break;
case 4:
cairo_set_source_surface(cr,image_to,0,height * (1 - progress));
break;
}
cairo_paint(cr);
}
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