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/*
* Copyright (c) 2009 Giuseppe Torelli <colossus73@gmail.com>
* 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>
#include <stdlib.h>
#define RAND_VALS 10 /* Number of random values to use */
/* 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 = "Misc";
*trans = g_new( gchar *, 7 );
(*trans)[i++] = "Cross Fade";
(*trans)[i++] = "img_cross_fade";
(*trans)[i++] = GINT_TO_POINTER( 19 );
(*trans)[i++] = "Dissolve";
(*trans)[i++] = "img_dissolve";
(*trans)[i++] = GINT_TO_POINTER( 67 );
(*trans)[i++] = NULL;
}
void
img_cross_fade( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress )
{
transition_render( cr, image_from, image_to, progress, 1 );
}
/* Local functions definitions */
static void
transition_render( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gint direction )
{
cairo_set_source_surface( cr, image_from, 0, 0 );
cairo_paint( cr );
cairo_set_source_surface( cr, image_to, 0, 0 );
cairo_paint_with_alpha( cr, progress );
}
void
img_dissolve( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress )
{
gint width, /* Image width */
height, /* Image height */
size, /* Size of the surface (width * height) */
draw, /* Number of pixels that need to be filled */
count; /* Number of pixels that are already drawn */
guchar *data; /* Mask surface data */
gint values[RAND_VALS]; /* Random values */
/* Persistent data */
static cairo_surface_t *mask = NULL;
static gint filled;
static gint stride;
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 );
/* Create new mask surface if we're starting effect */
if( progress < 0.00001 )
{
if( mask )
cairo_surface_destroy( mask );
mask = cairo_image_surface_create( CAIRO_FORMAT_A1, width, height );
stride = cairo_image_surface_get_stride( mask );
filled = 0;
return;
}
else if( progress > 0.9999 )
{
cairo_paint( cr );
return;
}
/* Calculate number of pixels that need to be drawn in this round. */
size = width * height;
draw = size * progress - filled;
filled += draw;
/* Get random values */
for( count = 0; count < RAND_VALS; count++ )
values[count] = rand() % size;
/* set fixel values on mask surface */
cairo_surface_flush( mask );
data = cairo_image_surface_get_data( mask );
for( count = 0; count < draw; count++ )
{
gint row,
col,
index,
shift;
static gint value = 0;
value += values[count % RAND_VALS] % size;
value %= size;
row = value / width;
col = value - width * row;
do
{
col++;
if( col == width )
{
col = 0;
row++;
row %= height;
}
index = row * stride + ( col / 8 );
shift = col % 8;
}
while( data[index] & ( 1 << shift ) );
data[index] |= ( 1 << shift );
}
cairo_surface_mark_dirty( mask );
/* Paint second surface */
cairo_mask_surface( cr, mask, 0, 0 );
}
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