89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/*
|
|
* Imaging utility functions for libfprint
|
|
* Copyright (C) 2007-2008 Daniel Drake <dsd@gentoo.org>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <gdk-pixbuf/gdk-pixbuf.h>
|
|
|
|
#include "fp_internal.h"
|
|
|
|
struct fp_img *fpi_im_resize(struct fp_img *img, unsigned int w_factor, unsigned int h_factor)
|
|
{
|
|
int new_width = img->width * w_factor;
|
|
int new_height = img->height * h_factor;
|
|
GdkPixbuf *orig, *resized;
|
|
struct fp_img *newimg;
|
|
guchar *pixels;
|
|
guint y;
|
|
int rowstride;
|
|
|
|
g_type_init ();
|
|
|
|
/* It is possible to implement resizing using a simple algorithm, however
|
|
* we use gdk-pixbuf because it applies some kind of smoothing to the
|
|
* result, which improves matching performances in my experiments. */
|
|
|
|
/* Create the original pixbuf, and fill it in from the grayscale data */
|
|
orig = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
|
|
FALSE,
|
|
8,
|
|
img->width,
|
|
img->height);
|
|
rowstride = gdk_pixbuf_get_rowstride (orig);
|
|
pixels = gdk_pixbuf_get_pixels (orig);
|
|
for (y = 0; y < img->height; y++) {
|
|
guint x;
|
|
for (x = 0; x < img->width; x++) {
|
|
guchar *p, *r;
|
|
|
|
p = pixels + y * rowstride + x * 3;
|
|
r = img->data + y * img->width + x;
|
|
p[0] = r[0];
|
|
p[1] = r[0];
|
|
p[2] = r[0];
|
|
}
|
|
}
|
|
|
|
/* Resize the pixbuf, and create the new fp_img */
|
|
resized = gdk_pixbuf_scale_simple (orig, new_width, new_height, GDK_INTERP_HYPER);
|
|
g_object_unref (orig);
|
|
|
|
newimg = fpi_img_new(new_width * new_height);
|
|
newimg->width = new_width;
|
|
newimg->height = new_height;
|
|
newimg->flags = img->flags;
|
|
|
|
rowstride = gdk_pixbuf_get_rowstride (resized);
|
|
pixels = gdk_pixbuf_get_pixels (resized);
|
|
for (y = 0; y < newimg->height; y++) {
|
|
guint x;
|
|
for (x = 0; x < newimg->width; x++) {
|
|
guchar *p, *r;
|
|
|
|
r = newimg->data + y * newimg->width + x;
|
|
p = pixels + y * rowstride + x * 3;
|
|
r[0] = p[0];
|
|
}
|
|
}
|
|
|
|
g_object_unref (resized);
|
|
|
|
return newimg;
|
|
}
|
|
|