a3ae96c214
The function fpi_im_resize copy the new resized image into old fp_img instead of newimg so, new image is empty and often it generated a segmentation fault error.
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
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* Imaging utility functions for libfprint
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* Copyright (C) 2007-2008 Daniel Drake <dsd@gentoo.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <errno.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "fp_internal.h"
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struct fp_img *fpi_im_resize(struct fp_img *img, unsigned int factor)
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{
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int new_width = img->width * factor;
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int new_height = img->height * factor;
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GdkPixbuf *orig, *resized;
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struct fp_img *newimg;
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guchar *pixels;
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guint y;
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int rowstride;
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g_type_init ();
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/* It is possible to implement resizing using a simple algorithm, however
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* we use gdk-pixbuf because it applies some kind of smoothing to the
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* result, which improves matching performances in my experiments. */
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/* Create the original pixbuf, and fill it in from the grayscale data */
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orig = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
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FALSE,
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8,
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img->width,
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img->height);
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rowstride = gdk_pixbuf_get_rowstride (orig);
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pixels = gdk_pixbuf_get_pixels (orig);
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for (y = 0; y < img->height; y++) {
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guint x;
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for (x = 0; x < img->width; x++) {
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guchar *p, *r;
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p = pixels + y * rowstride + x * 3;
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r = img->data + y * img->width + x;
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p[0] = r[0];
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p[1] = r[0];
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p[2] = r[0];
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}
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}
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/* Resize the pixbuf, and create the new fp_img */
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resized = gdk_pixbuf_scale_simple (orig, new_width, new_height, GDK_INTERP_HYPER);
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g_object_unref (orig);
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newimg = fpi_img_new(new_width * new_height);
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newimg->width = new_width;
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newimg->height = new_height;
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newimg->flags = img->flags;
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rowstride = gdk_pixbuf_get_rowstride (resized);
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pixels = gdk_pixbuf_get_pixels (resized);
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for (y = 0; y < newimg->height; y++) {
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guint x;
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for (x = 0; x < newimg->width; x++) {
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guchar *p, *r;
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r = newimg->data + y * newimg->width + x;
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p = pixels + y * rowstride + x * 3;
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r[0] = p[0];
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}
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}
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g_object_unref (resized);
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return newimg;
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}
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