68 lines
2.1 KiB
C
68 lines
2.1 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 <magick/ImageMagick.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 w_factor, unsigned int h_factor)
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{
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Image *mimg;
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Image *resized;
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ExceptionInfo exception;
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MagickBooleanType ret;
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int new_width = img->width * w_factor;
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int new_height = img->height * h_factor;
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struct fp_img *newimg;
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/* It is possible to implement resizing using a simple algorithm, however
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* we use ImageMagick 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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if (!IsMagickInstantiated())
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InitializeMagick(NULL);
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GetExceptionInfo(&exception);
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mimg = ConstituteImage(img->width, img->height, "I", CharPixel, img->data,
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&exception);
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GetExceptionInfo(&exception);
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resized = ResizeImage(mimg, new_width, new_height, 0, 1.0, &exception);
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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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GetExceptionInfo(&exception);
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ret = ExportImagePixels(resized, 0, 0, new_width, new_height, "I",
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CharPixel, newimg->data, &exception);
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if (ret != MagickTrue) {
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fp_err("export failed");
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return NULL;
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}
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DestroyImage(mimg);
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DestroyImage(resized);
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return newimg;
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}
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