64 lines
3.2 KiB
C++
64 lines
3.2 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/runtime/runtime.h"
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#include "third_party/avir/lanczos1f.h"
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namespace {
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#include "third_party/avir/lanczos1f.hpp"
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} // namespace
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void lanczos1finit(struct lanczos1f *resizer) {
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lanczos1ffree(resizer);
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resizer->p = new Lanczos1fImpl;
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}
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void lanczos1ffree(struct lanczos1f *resizer) {
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Lanczos1fImpl *impl;
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if (!resizer->p) return;
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impl = (Lanczos1fImpl *)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 lanczos1f scaler = {0};
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* lanczos1finit(&scaler);
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* lanczos1f(&scaler, ...);
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* lanczos1ffree(&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 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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*/
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void lanczos1f(struct lanczos1f *resizer, size_t dyn, size_t dxn, void *dst,
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size_t syn, size_t sxn, size_t ssw, const void *src, double ky0,
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double kx0, double oy, double ox) {
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Lanczos1fImpl *impl;
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impl = (Lanczos1fImpl *)resizer->p;
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impl->lanczos.resizeImage((const float *)src, sxn, syn, ssw, (float *)dst,
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dxn, dyn, 1, kx0, ky0, ox, oy);
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}
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