7615aaef7a
And fix fpi_img_new_for_imgdev()'s argument names to match between the header and the C file.
76 lines
2.5 KiB
C
76 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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* Copyright (C) 2013 Vasily Khoruzhick <anarsoul@gmail.com>
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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 <pixman.h>
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#include <string.h>
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#include "fp_internal.h"
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/**
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* fpi_img_resize:
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* @img: an #fp_img image
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* @w_factor: horizontal factor to resize the image by
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* @h_factor: vertical factor to resize the image by
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*
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* Resizes the #fp_img image by scaling it by @w_factor times horizontally
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* and @h_factor times vertically.
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*
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* Returns: a newly allocated #fp_img, the original @img will not be modified
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* and will also need to be freed
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*/
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struct fp_img *fpi_img_resize(struct fp_img *img, unsigned int w_factor, unsigned int h_factor)
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{
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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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pixman_image_t *orig, *resized;
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pixman_transform_t transform;
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struct fp_img *newimg;
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orig = pixman_image_create_bits(PIXMAN_a8, img->width, img->height, (uint32_t *)img->data, img->width);
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resized = pixman_image_create_bits(PIXMAN_a8, new_width, new_height, NULL, new_width);
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pixman_transform_init_identity(&transform);
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pixman_transform_scale(NULL, &transform, pixman_int_to_fixed(w_factor), pixman_int_to_fixed(h_factor));
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pixman_image_set_transform(orig, &transform);
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pixman_image_set_filter(orig, PIXMAN_FILTER_BILINEAR, NULL, 0);
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pixman_image_composite32(PIXMAN_OP_SRC,
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orig, /* src */
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NULL, /* mask */
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resized, /* dst */
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0, 0, /* src x y */
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0, 0, /* mask x y */
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0, 0, /* dst x y */
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new_width, new_height /* width height */
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);
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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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memcpy(newimg->data, pixman_image_get_data(resized), new_width * new_height);
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pixman_image_unref(orig);
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pixman_image_unref(resized);
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return newimg;
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}
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