211 lines
8.0 KiB
C
211 lines
8.0 KiB
C
/*-*- 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/limits.h"
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#include "libc/log/check.h"
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#include "libc/macros.h"
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#include "libc/math.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/madv.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/x/x.h"
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#include "third_party/stb/stb_image.h"
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#define CLAMP(X) MAX(0, MIN(255, X))
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#define C13(A, B) (((A) + 3 * (B) + 2) >> 2)
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#define S3T(A, B, C) CLAMP(-((A) >> 2) + ((B) + ((B) >> 1)) + -((C) >> 2))
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#define LERP(X, Y, P) ((X) + (((P) * ((Y) - (X))) >> 8))
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static unsigned char ChessBoard(unsigned y, unsigned x, unsigned char a,
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unsigned char b) {
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return !((y ^ x) & (1u << 2)) ? a : b;
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}
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static unsigned char AlphaBackground(unsigned y, unsigned x) {
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return ChessBoard(y, x, 255, 200);
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}
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static unsigned char OutOfBoundsBackground(unsigned y, unsigned x) {
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return ChessBoard(y, x, 40, 80);
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}
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static unsigned char Opacify(size_t yn, size_t xn,
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const unsigned char P[yn][xn],
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const unsigned char A[yn][xn], long y, long x) {
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if ((0 <= y && y < yn) && (0 <= x && x < xn)) {
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return LERP(AlphaBackground(y, x), P[y][x], A[y][x]);
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} else {
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return OutOfBoundsBackground(y, x);
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}
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}
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static void PrintImage(size_t yn, size_t xn, unsigned char R[yn][xn],
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unsigned char G[yn][xn], unsigned char B[yn][xn],
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unsigned char A[yn][xn]) {
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unsigned y, x;
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for (y = 0; y < yn; y += 2) {
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if (y) printf("\e[0m\n");
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for (x = 0; x < xn; ++x) {
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printf("\e[48;2;%d;%d;%d;38;2;%d;%d;%dm▄",
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Opacify(yn, xn, R, A, y + 0, x), Opacify(yn, xn, G, A, y + 0, x),
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Opacify(yn, xn, B, A, y + 0, x), Opacify(yn, xn, R, A, y + 1, x),
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Opacify(yn, xn, G, A, y + 1, x), Opacify(yn, xn, B, A, y + 1, x));
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}
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}
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printf("\e[0m\n");
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}
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static void DeblinterlaceRgba(size_t dyn, size_t dxn, unsigned char R[dyn][dxn],
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unsigned char G[dyn][dxn],
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unsigned char B[dyn][dxn],
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unsigned char A[dyn][dxn], size_t syn, size_t sxn,
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const unsigned char src[syn][sxn][4]) {
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unsigned y, x;
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for (y = 0; y < syn; ++y) {
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for (x = 0; x < sxn; ++x) {
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R[y][x] = src[y][x][0];
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G[y][x] = src[y][x][1];
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B[y][x] = src[y][x][2];
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A[y][x] = src[y][x][3];
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}
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}
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}
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static void SharpenX(size_t yw, size_t xw, unsigned char dst[yw][xw],
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const unsigned char src[yw][xw], size_t yn, size_t xn) {
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int y, x;
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for (y = 0; y < yn; ++y) {
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for (x = 0; x < xn; ++x) {
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dst[y][x] =
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S3T(src[y][MAX(0, x - 1)], src[y][x], src[y][MIN(xn - 1, x + 1)]);
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}
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}
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}
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static void SharpenY(size_t yw, size_t xw, unsigned char dst[yw][xw],
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const unsigned char src[yw][xw], size_t yn, size_t xn) {
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int y, x;
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for (y = 0; y < yn; ++y) {
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for (x = 0; x < xn; ++x) {
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dst[y][x] =
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S3T(src[MAX(0, y - 1)][x], src[y][x], src[MIN(yn - 1, y + 1)][x]);
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}
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}
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}
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static void UpscaleX(size_t yw, size_t xw, unsigned char img[yw][xw], size_t yn,
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size_t xn) {
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unsigned y, x;
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for (y = yn; y--;) {
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for (x = xn; --x;) {
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img[y][x] =
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C13(img[y][MIN(xn / 2 - 1, x / 2 - 1 + x % 2 * 2)], img[y][x / 2]);
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}
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}
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}
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static void UpscaleY(size_t yw, size_t xw, unsigned char img[yw][xw], size_t yn,
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size_t xn) {
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unsigned y, x;
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for (y = yn; --y;) {
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for (x = xn; x--;) {
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img[y][x] =
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C13(img[MIN(yn / 2 - 1, y / 2 - 1 + y % 2 * 2)][x], img[y / 2][x]);
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}
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}
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}
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static void Upscale(size_t yw, size_t xw, unsigned char img[yw][xw],
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unsigned char tmp[yw][xw], size_t yn, size_t xn) {
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UpscaleY(yw, xw, img, yn, xn / 2);
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SharpenY(yw, xw, tmp, img, yn, xn / 2);
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UpscaleX(yw, xw, tmp, yn, xn);
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SharpenX(yw, xw, img, tmp, yn, xn);
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}
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static void ProcessImageDouble(size_t yn, size_t xn,
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unsigned char img[yn][xn][4]) {
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void *t = xmemalign(32, sizeof(unsigned char) * yn * 2 * xn * 2);
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void *R = xmemalign(32, sizeof(unsigned char) * yn * 2 * xn * 2);
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void *G = xmemalign(32, sizeof(unsigned char) * yn * 2 * xn * 2);
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void *B = xmemalign(32, sizeof(unsigned char) * yn * 2 * xn * 2);
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void *A = xmemalign(32, sizeof(unsigned char) * yn * 2 * xn * 2);
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DeblinterlaceRgba(yn * 2, xn * 2, R, G, B, A, yn, xn, img);
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Upscale(yn * 2, xn * 2, R, t, yn * 2, xn * 2);
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Upscale(yn * 2, xn * 2, G, t, yn * 2, xn * 2);
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Upscale(yn * 2, xn * 2, B, t, yn * 2, xn * 2);
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Upscale(yn * 2, xn * 2, A, t, yn * 2, xn * 2);
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free(t);
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PrintImage(yn * 2, xn * 2, R, G, B, A);
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free(R);
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free(G);
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free(B);
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free(A);
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}
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static void ProcessImage(size_t yn, size_t xn, unsigned char img[yn][xn][4]) {
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void *R = xmemalign(32, sizeof(unsigned char) * yn * xn);
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void *G = xmemalign(32, sizeof(unsigned char) * yn * xn);
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void *B = xmemalign(32, sizeof(unsigned char) * yn * xn);
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void *A = xmemalign(32, sizeof(unsigned char) * yn * xn);
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DeblinterlaceRgba(yn, xn, R, G, B, A, yn, xn, img);
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PrintImage(yn, xn, R, G, B, A);
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free(R);
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free(G);
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free(B);
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free(A);
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}
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void WithImageFile(const char *path, void fn(size_t yn, size_t xn,
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unsigned char img[yn][xn][4])) {
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struct stat st;
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int fd, yn, xn;
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void *map, *data;
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CHECK_NE(-1, (fd = open(path, O_RDONLY)), "%s", path);
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CHECK_NE(-1, fstat(fd, &st));
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CHECK_GT(st.st_size, 0);
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CHECK_LE(st.st_size, INT_MAX);
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fadvise(fd, 0, 0, MADV_WILLNEED | MADV_SEQUENTIAL);
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CHECK_NE(MAP_FAILED,
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(map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0)));
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CHECK_NOTNULL(
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(data = stbi_load_from_memory(map, st.st_size, &xn, &yn, NULL, 4)), "%s",
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path);
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CHECK_NE(-1, munmap(map, st.st_size));
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CHECK_NE(-1, close(fd));
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fn(yn, xn, data);
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free(data);
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}
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int main(int argc, char *argv[]) {
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int i;
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for (i = 1; i < argc; ++i) {
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WithImageFile(argv[i], ProcessImageDouble);
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}
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return 0;
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}
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