78 lines
3.7 KiB
C++
78 lines
3.7 KiB
C++
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/*-*-mode:c++;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8-*-│
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│vi: set net ft=c++ ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ 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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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/xmmintrin.h"
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#include "libc/limits.h"
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#include "libc/log/log.h"
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#include "libc/runtime/runtime.h"
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#include "third_party/avir/lanczos1.h"
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namespace {
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#include "third_party/avir/lanczos1.hpp"
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} // namespace
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void lanczos1init(struct lanczos1 *resizer) {
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lanczos1free(resizer);
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resizer->p = new Lanczos1Impl;
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}
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void lanczos1free(struct lanczos1 *resizer) {
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Lanczos1Impl *impl;
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if (!resizer->p) return;
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impl = (Lanczos1Impl *)resizer->p;
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delete impl;
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resizer->p = nullptr;
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}
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/**
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* Resizes image plane w/ Lanczos interpolation, e.g.
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*
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* struct lanczos1 scaler = {0};
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* lanczos1init(&scaler);
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* lanczos1(&scaler, ...);
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* lanczos1free(&scaler);
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*
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* @param dyn is destination height
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* @param dxn is destination width
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* @param dst is destination unsigned char array
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* @param dstsize is number of bytes in dst
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* @param syn is source height
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* @param sxn is source width
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* @param ssw is number of unsigned chars per scanline in src
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* @param src is source unsigned char array
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* @param srcsize is number of bytes in src
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*/
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void lanczos1(struct lanczos1 *resizer, size_t dyn, size_t dxn, void *dst,
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size_t dstsize, size_t syn, size_t sxn, size_t ssw,
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const void *src, size_t srcsize) {
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Lanczos1Impl *impl;
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unsigned int roundhouse;
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LOGF("%10s%5zux×%-5zu→%5zu×%-5zu", "lanczos1", sxn, syn, dxn, dyn);
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CHECK_LE(dstsize, INT_MAX);
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CHECK_LE(srcsize, INT_MAX);
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CHECK_LE(sizeof(unsigned char) * 1 * dyn * dxn, dstsize);
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CHECK_LE(sizeof(unsigned char) * 1 * syn * sxn, srcsize);
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CHECK_LE(sizeof(unsigned char) * syn * ssw, srcsize);
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roundhouse = _MM_GET_ROUNDING_MODE();
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_MM_SET_ROUNDING_MODE(_MM_ROUND_NEAREST);
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impl = (Lanczos1Impl *)resizer->p;
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impl->lanczos.resizeImage((const unsigned char *)src, sxn, syn, ssw,
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(unsigned char *)dst, dxn, dyn, 1);
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_MM_SET_ROUNDING_MODE(roundhouse);
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}
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