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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
/*
* Copyright (C) 2004 Anders Carlsson <andersca@gnome.org>
*
* 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, 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 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 "ev-utils.h"
#include <math.h>
typedef struct
{
int size;
double *data;
} ConvFilter;
static double
gaussian (double x, double y, double r)
{
return ((1 / (2 * M_PI * r)) *
exp ((- (x * x + y * y)) / (2 * r * r)));
}
static ConvFilter *
create_blur_filter (int radius)
{
ConvFilter *filter;
int x, y;
double sum;
filter = g_new0 (ConvFilter, 1);
filter->size = radius * 2 + 1;
filter->data = g_new (double, filter->size * filter->size);
sum = 0.0;
for (y = 0 ; y < filter->size; y++)
{
for (x = 0 ; x < filter->size; x++)
{
sum += filter->data[y * filter->size + x] = gaussian (x - (filter->size >> 1),
y - (filter->size >> 1),
radius);
}
}
for (y = 0; y < filter->size; y++)
{
for (x = 0; x < filter->size; x++)
{
filter->data[y * filter->size + x] /= sum;
}
}
return filter;
}
static GdkPixbuf *
create_shadow (GdkPixbuf *src, int blur_radius,
int x_offset, int y_offset, double opacity)
{
int x, y, i, j;
int width, height;
GdkPixbuf *dest;
static ConvFilter *filter = NULL;
int src_rowstride, dest_rowstride;
int src_bpp, dest_bpp;
guchar *src_pixels, *dest_pixels;
if (!filter)
filter = create_blur_filter (blur_radius);
if (x_offset < 0)
x_offset = (blur_radius * 4) / 5;
if (y_offset < 0)
y_offset = (blur_radius * 4) / 5;
width = gdk_pixbuf_get_width (src) + blur_radius * 2 + x_offset;
height = gdk_pixbuf_get_height (src) + blur_radius * 2 + y_offset;
dest = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (src), TRUE,
gdk_pixbuf_get_bits_per_sample (src),
width, height);
gdk_pixbuf_fill (dest, 0);
src_pixels = gdk_pixbuf_get_pixels (src);
src_rowstride = gdk_pixbuf_get_rowstride (src);
src_bpp = gdk_pixbuf_get_has_alpha (src) ? 4 : 3;
dest_pixels = gdk_pixbuf_get_pixels (dest);
dest_rowstride = gdk_pixbuf_get_rowstride (dest);
dest_bpp = gdk_pixbuf_get_has_alpha (dest) ? 4 : 3;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
int sumr = 0, sumg = 0, sumb = 0, suma = 0;
for (i = 0; i < filter->size; i++)
{
for (j = 0; j < filter->size; j++)
{
int src_x, src_y;
src_y = -(blur_radius + x_offset) + y - (filter->size >> 1) + i;
src_x = -(blur_radius + y_offset) + x - (filter->size >> 1) + j;
if (src_y < 0 || src_y > gdk_pixbuf_get_height (src) ||
src_x < 0 || src_x > gdk_pixbuf_get_width (src))
continue;
sumr += src_pixels [src_y * src_rowstride +
src_x * src_bpp + 0] *
filter->data [i * filter->size + j];
sumg += src_pixels [src_y * src_rowstride +
src_x * src_bpp + 1] *
filter->data [i * filter->size + j];
sumb += src_pixels [src_y * src_rowstride +
src_x * src_bpp + 2] *
filter->data [i * filter->size + j];
if (src_bpp == 4)
suma += src_pixels [src_y * src_rowstride +
src_x * src_bpp + 3] *
filter->data [i * filter->size + j];
else
suma += 0xff;
}
}
if (dest_bpp == 4)
dest_pixels [y * dest_rowstride +
x * dest_bpp + 3] = (suma * opacity) / (filter->size * filter->size);
}
}
return dest;
}
GdkPixbuf *
ev_pixbuf_add_shadow (GdkPixbuf *src, int size,
int x_offset, int y_offset, double opacity)
{
GdkPixbuf *dest;
dest = create_shadow (src, size, x_offset, y_offset, opacity);
gdk_pixbuf_composite (src, dest,
size, size,
gdk_pixbuf_get_width (src),
gdk_pixbuf_get_height (src),
size, size,
1.0, 1.0,
GDK_INTERP_NEAREST, 255);
return dest;
}
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