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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 direction );
/* Plug-in API */
void
img_get_plugin_info( gchar **group,
gchar ***trans )
{
gint i = 0;
*group = "Wave";
*trans = g_new( gchar *, 25 );
(*trans)[i++] = "Wave Down";
(*trans)[i++] = "img_down";
(*trans)[i++] = GINT_TO_POINTER( 48 );
(*trans)[i++] = "Wave Up";
(*trans)[i++] = "img_up";
(*trans)[i++] = GINT_TO_POINTER( 49 );
(*trans)[i++] = "Wave Left";
(*trans)[i++] = "img_left";
(*trans)[i++] = GINT_TO_POINTER( 50 );
(*trans)[i++] = "Wave Right";
(*trans)[i++] = "img_right";
(*trans)[i++] = GINT_TO_POINTER( 51 );
(*trans)[i++] = "Wave Left Down";
(*trans)[i++] = "img_left_down";
(*trans)[i++] = GINT_TO_POINTER( 52 );
(*trans)[i++] = "Wave Left Up";
(*trans)[i++] = "img_left_up";
(*trans)[i++] = GINT_TO_POINTER( 53 );
(*trans)[i++] = "Wave Right Up";
(*trans)[i++] = "img_right_up";
(*trans)[i++] = GINT_TO_POINTER( 54 );
(*trans)[i++] = "Wave Right Down";
(*trans)[i++] = "img_right_down";
(*trans)[i++] = GINT_TO_POINTER( 55 );
(*trans)[i++] = NULL;
}
void
img_down( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 1 );
}
void
img_up( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 2 );
}
void
img_right( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 3 );
}
void
img_left( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 4 );
}
void
img_right_down( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 5 );
}
void
img_right_up( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 6 );
}
void
img_left_up(cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 7 );
}
void
img_left_down( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
transition_render( cr, image_from, image_to, progress, 8 );
}
/* 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;
gdouble wave_factor = 1.07; // 50px
gdouble stop;
cairo_pattern_t *pattern;
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 );
switch( direction )
{
case 1: /* down */
pattern = cairo_pattern_create_linear( width / 2, 0, width / 2, height );
break;
case 2: /* up */
pattern = cairo_pattern_create_linear( width / 2, height, width / 2, 0 );
break;
case 3: /* left */
pattern = cairo_pattern_create_linear( width, height / 2, 0, height / 2 );
break;
case 4: /* right */
pattern = cairo_pattern_create_linear( 0, height / 2, width, height / 2 );
break;
case 5: /* left down */
pattern = cairo_pattern_create_linear( width, 0, 0, height );
break;
case 6: /* left up */
pattern = cairo_pattern_create_linear( width, height, 0, 0 );
break;
case 7: /* right up */
pattern = cairo_pattern_create_linear( 0, height , width, 0 );
break;
case 8: /* right down */
pattern = cairo_pattern_create_linear( 0, 0, width, height );
break;
}
/* 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);
}
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