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/*
* 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 <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 type );
/* Plug-in API */
void
img_get_plugin_info( gchar **group,
gchar ***trans )
{
gint i = 0;
*group = "Misc Diagonal Wipe";
*trans = g_new( gchar *, 7 );
(*trans)[i++] = "Double Barn Door";
(*trans)[i++] = "img_barn";
(*trans)[i++] = GINT_TO_POINTER( 38 );
(*trans)[i++] = "Double Diamond";
(*trans)[i++] = "img_diamond";
(*trans)[i++] = GINT_TO_POINTER( 39 );
(*trans)[i++] = NULL;
}
void
img_barn( 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_diamond( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 2 );
}
/* Local functions definitions */
static void
transition_render( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint type )
{
gint width, height, w2, h2;
width = cairo_image_surface_get_width( image_from );
height = cairo_image_surface_get_height( image_from );
cairo_set_source_surface( cr, image_from, 0, 0 );
cairo_paint( cr );
cairo_set_source_surface( cr, image_to, 0, 0 );
w2 = width / 2;
h2 = height / 2;
switch( type )
{
case 1:
cairo_move_to( cr, 0, 0 );
cairo_line_to( cr, 0, h2 * progress );
cairo_line_to( cr, w2 * ( 1 - progress ), h2 );
cairo_line_to( cr, 0, h2 * ( 2 - progress ) );
cairo_line_to( cr, 0, height );
cairo_line_to( cr, w2 * progress, height );
cairo_line_to( cr, w2, h2 * ( 1 + progress ) );
cairo_line_to( cr, w2 * ( 2 - progress ), height );
cairo_line_to( cr, width, height );
cairo_line_to( cr, width, h2 * ( 2 - progress ) );
cairo_line_to( cr, w2 * ( 1 + progress ), h2 );
cairo_line_to( cr, width, h2 * progress );
cairo_line_to( cr, width, 0 );
cairo_line_to( cr, w2 * ( 2 - progress ), 0 );
cairo_line_to( cr, w2, h2 * ( 1 - progress ) );
cairo_line_to( cr, w2 * progress, 0 );
cairo_close_path( cr );
break;
case 2:
cairo_set_fill_rule( cr, CAIRO_FILL_RULE_EVEN_ODD );
cairo_move_to( cr, 0, h2 * ( 1 - progress ) );
cairo_line_to( cr, 0, h2 * ( 1 + progress ) );
cairo_line_to( cr, w2 * ( 1 - progress ), height );
cairo_line_to( cr, w2 * ( 1 + progress ), height );
cairo_line_to( cr, width, h2 * ( 1 + progress ) );
cairo_line_to( cr, width, h2 * ( 1 - progress ) );
cairo_line_to( cr, w2 * ( 1 + progress ), 0 );
cairo_line_to( cr, w2 * ( 1 - progress ), 0 );
cairo_close_path( cr );
cairo_new_sub_path( cr );
cairo_move_to( cr, w2 * progress, h2 );
cairo_line_to( cr, w2, h2 * ( 2 - progress ) );
cairo_line_to( cr, w2 * ( 2 - progress ), h2 );
cairo_line_to( cr, w2, h2 * progress );
cairo_close_path( cr );
break;
}
cairo_fill( cr );
}
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