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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "dsp/tty/itoa8.h"
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/hefty/spawn.h"
#include "libc/calls/ioctl.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/termios.h"
#include "libc/conv/conv.h"
#include "libc/fmt/fmt.h"
#include "libc/limits.h"
#include "libc/log/check.h"
#include "libc/log/log.h"
#include "libc/macros.h"
#include "libc/math.h"
#include "libc/mem/mem.h"
#include "libc/nexgen32e/x86feature.h"
#include "libc/runtime/gc.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/str/tpenc.h"
#include "libc/sysv/consts/ex.h"
#include "libc/sysv/consts/exit.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/consts/madv.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "libc/x/x.h"
#include "third_party/avir/lanczos.h"
#include "third_party/getopt/getopt.h"
#include "third_party/stb/stb_image.h"
#include "third_party/stb/stb_image_resize.h"
#define HELPTEXT \
"\n\
NAME\n\
\n\
derasterize - convert pictures to text using unicode ANSI art\n\
\n\
SYNOPSIS\n\
\n\
derasterize [FLAGS] [PNG|JPG|ETC]...\n\
\n\
DESCRIPTION\n\
\n\
This program converts pictures into unicode text and ANSI colors so\n\
that images can be displayed within a terminal. It performs lots of\n\
AVX2 optimized math to deliver the best quality on modern terminals\n\
with 24-bit color support, e.g. Kitty, Gnome Terminal, CMD.EXE, etc\n\
\n\
The default output if fullscreen but can be changed:\n\
-w X\n\
-x X\n\
If X is positive, hardcode the width in tty cells to X\n\
If X is negative, remove as much from the fullscreen width\n\
X may be specified as base 10 decimal, octal, binary, or hex\n\
-h Y\n\
-y Y\n\
If Y is positive, hardcode the height in tty cells to Y\n\
If Y is negative, remove as much from the fullscreen height\n\
May be specified as base 10 decimal, octal, binary, or hex\n\
-m\n\
Use ImageMagick `convert` command to load/scale graphics\n\
-?\n\
-H\n\
Show this help information\n\
\n\
EXAMPLES\n\
\n\
$ ./derasterize.com samples/wave.png > wave.uaart\n\
$ cat wave.uaart\n\
\n\
AUTHORS\n\
\n\
Csdvrx <csdvrx@outlook.com>\n\
Justine Tunney <jtunney@gmail.com>\n\
"
int m_; /* -m [use imagemagick] */
int x_; /* -x WIDTH [in flexidecimal] */
int y_; /* -y HEIGHT [in flexidecimal] */
#define BEST 0
#define FAST 1
#define FASTER 2
#define MODE BEST
#if MODE == BEST
#define MC 9u /* log2(#) of color combos to consider */
#define GN 35u /* # of glyphs to consider */
#elif MODE == FAST
#define MC 6u
#define GN 35u
#elif MODE == FASTER
#define MC 4u
#define GN 25u
#endif
#define CN 3u /* # channels (rgb) */
#define YS 8u /* row stride -or- block height */
#define XS 4u /* column stride -or- block width */
#define GT 44u /* total glyphs */
#define BN (YS * XS) /* # scalars in block/glyph plane */
#define PHIPRIME 0x9E3779B1u
extern const uint32_t kGlyphs[];
extern const char16_t kRunes[];
/*───────────────────────────────────────────────────────────────────────────│─╗
│ derasterize § encoding ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
/**
* Formats Thompson-Pike variable length integer to array.
*
* @param p needs at least 8 bytes
* @return p + number of bytes written, cf. mempcpy
* @note no NUL-terminator is added
*/
static char *tptoa(char *p, wchar_t x) {
unsigned long w;
for (w = tpenc(x); w; w >>= 010) *p++ = w & 0xff;
return p;
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ derasterize § colors ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
static float frgb2lin(float x) {
float r1, r2;
r1 = x / 12.92f;
r2 = pow((x + 0.055) / (1 + 0.055), 2.4);
return x < 0.04045f ? r1 : r2;
}
static float frgb2std(float x) {
float r1, r2;
r1 = x * 12.92f;
r2 = 1.055 * pow(x, 1 / 2.4) - 0.055;
return x < 0.0031308f ? r1 : r2;
}
/**
* Converts 8-bit RGB samples to floating point.
*/
static void rgb2float(unsigned n, float *f, const unsigned char *u) {
unsigned i;
for (i = 0; i < n; ++i) f[i] = u[i];
for (i = 0; i < n; ++i) f[i] /= 255;
}
/**
* Converts floating point RGB samples to 8-bit.
*/
static void float2rgb(unsigned n, unsigned char *u, float *f) {
unsigned i;
for (i = 0; i < n; ++i) f[i] *= 256;
for (i = 0; i < n; ++i) f[i] = roundf(f[i]);
for (i = 0; i < n; ++i) u[i] = MAX(0, MIN(255, f[i]));
}
/**
* Converts standard RGB to linear RGB.
*
* This makes subtraction look good by flattening out the bias curve
* that PC display manufacturers like to use.
*/
static noinline void rgb2lin(unsigned n, float *f, const unsigned char *u) {
unsigned i;
rgb2float(n, f, u);
for (i = 0; i < n; ++i) f[i] = frgb2lin(f[i]);
}
/**
* Converts linear RGB to standard RGB.
*/
static noinline void rgb2std(unsigned n, unsigned char *u, float *f) {
unsigned i;
for (i = 0; i < n; ++i) f[i] = frgb2std(f[i]);
float2rgb(n, u, f);
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ derasterize § blocks ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
struct Cell {
char16_t rune;
unsigned char bg[CN], fg[CN];
};
/**
* Serializes ANSI background, foreground, and UNICODE glyph to wire.
*/
static char *celltoa(char *p, struct Cell cell) {
*p++ = 033;
*p++ = '[';
*p++ = '4';
*p++ = '8';
*p++ = ';';
*p++ = '2';
*p++ = ';';
p = itoa8(p, cell.bg[0]);
*p++ = ';';
p = itoa8(p, cell.bg[1]);
*p++ = ';';
p = itoa8(p, cell.bg[2]);
*p++ = ';';
*p++ = '3';
*p++ = '8';
*p++ = ';';
*p++ = '2';
*p++ = ';';
p = itoa8(p, cell.fg[0]);
*p++ = ';';
p = itoa8(p, cell.fg[1]);
*p++ = ';';
p = itoa8(p, cell.fg[2]);
*p++ = 'm';
p = tptoa(p, cell.rune);
return p;
}
/**
* Picks ≤2**MC unique (bg,fg) pairs from product of lb.
*/
static unsigned combinecolors(unsigned char bf[1u << MC][2],
const unsigned char bl[CN][YS * XS]) {
uint64_t hv, ht[(1u << MC) * 2];
unsigned i, j, n, b, f, h, hi, bu, fu;
memset(ht, 0, sizeof(ht));
for (n = b = 0; b < BN && n < (1u << MC); ++b) {
bu = bl[2][b] << 020 | bl[1][b] << 010 | bl[0][b];
hi = 0;
hi = (((bu >> 000) & 0xff) + hi) * PHIPRIME;
hi = (((bu >> 010) & 0xff) + hi) * PHIPRIME;
hi = (((bu >> 020) & 0xff) + hi) * PHIPRIME;
for (f = b + 1; f < BN && n < (1u << MC); ++f) {
fu = bl[2][f] << 020 | bl[1][f] << 010 | bl[0][f];
h = hi;
h = (((fu >> 000) & 0xff) + h) * PHIPRIME;
h = (((fu >> 010) & 0xff) + h) * PHIPRIME;
h = (((fu >> 020) & 0xff) + h) * PHIPRIME;
h = h & 0xffff;
h = MAX(1, h);
hv = 0;
hv <<= 030;
hv |= fu;
hv <<= 030;
hv |= bu;
hv <<= 020;
hv |= h;
for (i = 0;; ++i) {
j = (h + i * (i + 1) / 2) & (ARRAYLEN(ht) - 1);
if (!ht[j]) {
ht[j] = hv;
bf[n][0] = b;
bf[n][1] = f;
n++;
break;
} else if (ht[j] == hv) {
break;
}
}
}
}
return n;
}
/**
* Computes distance between synthetic block and actual.
*/
#define ADJUDICATE(SYMBOL, ARCH) \
ARCH static float SYMBOL(unsigned b, unsigned f, unsigned g, \
const float lb[CN][YS * XS]) { \
unsigned i, k, gu; \
float p[BN], q[BN], fu, bu, r; \
memset(q, 0, sizeof(q)); \
for (k = 0; k < CN; ++k) { \
gu = kGlyphs[g]; \
bu = lb[k][b]; \
fu = lb[k][f]; \
for (i = 0; i < BN; ++i) p[i] = (gu & (1u << i)) ? fu : bu; \
for (i = 0; i < BN; ++i) p[i] -= lb[k][i]; \
for (i = 0; i < BN; ++i) p[i] *= p[i]; \
for (i = 0; i < BN; ++i) q[i] += p[i]; \
} \
r = 0; \
for (i = 0; i < BN; ++i) q[i] = sqrtf(q[i]); \
for (i = 0; i < BN; ++i) r += q[i]; \
return r; \
}
ADJUDICATE(adjudicate$avx2, microarchitecture("avx2,fma"))
ADJUDICATE(adjudicate$avx, microarchitecture("avx"))
ADJUDICATE(adjudicate$default, )
static float (*adjudicate$hook)(unsigned, unsigned, unsigned,
const float[CN][YS * XS]);
static float adjudicate2(unsigned b, unsigned f, unsigned g,
const float lb[CN][YS * XS]) {
if (!adjudicate$hook) {
if (X86_HAVE(AVX2) && X86_HAVE(FMA)) {
adjudicate$hook = adjudicate$avx2;
} else if (X86_HAVE(AVX)) {
adjudicate$hook = adjudicate$avx;
} else {
adjudicate$hook = adjudicate$default;
}
}
return adjudicate$hook(b, f, g, lb);
}
static float adjudicate(unsigned b, unsigned f, unsigned g,
const float lb[CN][YS * XS]) {
unsigned i, k, gu;
float p[BN], q[BN], fu, bu, r;
memset(q, 0, sizeof(q));
for (k = 0; k < CN; ++k) {
gu = kGlyphs[g];
bu = lb[k][b];
fu = lb[k][f];
for (i = 0; i < BN; ++i) p[i] = (gu & (1u << i)) ? fu : bu;
for (i = 0; i < BN; ++i) p[i] -= lb[k][i];
for (i = 0; i < BN; ++i) p[i] *= p[i];
for (i = 0; i < BN; ++i) q[i] += p[i];
}
r = 0;
for (i = 0; i < BN; ++i) q[i] = sqrtf(q[i]);
for (i = 0; i < BN; ++i) r += q[i];
return r;
}
/**
* Converts tiny bitmap graphic into unicode glyph.
*/
static struct Cell derasterize(unsigned char block[CN][YS * XS]) {
struct Cell cell;
unsigned i, n, b, f, g;
float r, best, lb[CN][YS * XS];
unsigned char bf[1u << MC][2];
rgb2lin(CN * YS * XS, lb[0], block[0]);
n = combinecolors(bf, block);
best = -1u;
cell.rune = 0;
for (i = 0; i < n; ++i) {
b = bf[i][0];
f = bf[i][1];
for (g = 0; g < GN; ++g) {
r = adjudicate(b, f, g, lb);
if (r < best) {
best = r;
cell.rune = kRunes[g];
cell.bg[0] = block[0][b];
cell.bg[1] = block[1][b];
cell.bg[2] = block[2][b];
cell.fg[0] = block[0][f];
cell.fg[1] = block[1][f];
cell.fg[2] = block[2][f];
if (!r) return cell;
}
}
}
return cell;
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ derasterize § graphics ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
/**
* Turns packed 8-bit RGB graphic into ANSI UNICODE text.
*/
static char *RenderImage(char *v, unsigned yn, unsigned xn,
const unsigned char srgb[yn][YS][xn][XS][CN]) {
unsigned y, x, i, j, k;
unsigned char copy[YS][XS][CN] aligned(32);
unsigned char block[CN][YS * XS] aligned(32);
DCHECK_ALIGNED(32, v);
DCHECK_ALIGNED(32, srgb);
for (y = 0; y < yn; ++y) {
if (y) {
*v++ = 033;
*v++ = '[';
*v++ = '0';
*v++ = 'm';
*v++ = '\n';
}
for (x = 0; x < xn; ++x) {
for (i = 0; i < YS; ++i) {
memcpy(copy[i], srgb[y][i][x], XS * CN);
}
for (i = 0; i < YS; ++i) {
for (j = 0; j < XS; ++j) {
for (k = 0; k < CN; ++k) {
block[k][i * XS + j] = copy[i][j][k];
}
}
}
v = celltoa(v, derasterize(block));
}
}
return v;
}
/*───────────────────────────────────────────────────────────────────────────│─╗
│ derasterize § systems ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
static void PrintImage(unsigned yn, unsigned xn,
const unsigned char rgb[yn][YS][xn][XS][CN]) {
size_t size;
char *v, *vt;
size = yn * (xn * (32 + (2 + (1 + 3) * 3) * 2 + 1 + 3)) * 1 + 5 + 1;
size = ROUNDUP(size, FRAMESIZE);
CHECK_NE(MAP_FAILED, (vt = mapanon(size)));
v = RenderImage(vt, yn, xn, rgb);
*v++ = '\r';
*v++ = 033;
*v++ = '[';
*v++ = '0';
*v++ = 'm';
CHECK_NE(-1, xwrite(1, vt, v - vt));
CHECK_NE(-1, munmap(vt, size));
}
/**
* Determines dimensions of teletypewriter.
*/
static void GetTermSize(unsigned out_rows[1], unsigned out_cols[1]) {
struct winsize ws;
ws.ws_row = 24;
ws.ws_col = 80;
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) {
ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
}
out_rows[0] = ws.ws_row;
out_cols[0] = ws.ws_col;
}
static int ReadAll(int fd, void *data, size_t size) {
char *p;
ssize_t rc;
size_t got, n;
p = data;
n = size;
do {
if ((rc = read(fd, p, n)) == -1) return -1;
assert((got = rc) || !n);
p += got;
n -= got;
} while (n);
return 0;
}
/**
* Loads and scales image via ImageMagick `convert` command.
*
* @param path is filename of graphic
* @param yn is desired height
* @param xn is desired width
* @param rgb is memory allocated by caller for image
*/
static void LoadFileViaImageMagick(const char *path, unsigned yn, unsigned xn,
unsigned char rgb[yn][YS][xn][XS][CN]) {
const char *convert;
char pathbuf[PATH_MAX];
int pid, ws, fds[3] = {STDIN_FILENO, -1, STDERR_FILENO};
if (!(convert = commandv("convert", pathbuf))) {
fputs("error: `convert` command not found\n"
"try: apt-get install imagemagick\n",
stderr);
exit(EXIT_FAILURE);
}
CHECK_NE(-1,
(pid = spawnve(
0, fds, convert,
(char *const[]){"convert", path, "-resize",
xasprintf("%ux%u!", xn * XS, yn * YS), "-depth",
"8", "-colorspace", "sRGB", "rgb:-", NULL},
environ)));
CHECK_NE(-1, ReadAll(fds[STDOUT_FILENO], rgb, yn * YS * xn * XS * CN));
CHECK_NE(-1, close(fds[STDOUT_FILENO]));
CHECK_NE(-1, waitpid(pid, &ws, 0));
CHECK_EQ(0, WEXITSTATUS(ws));
}
static void LoadFile(const char *path, size_t yn, size_t xn, void *rgb) {
struct stat st;
size_t data2size, data3size;
void *map, *data, *data2, *data3;
int fd, gotx, goty, channels_in_file;
CHECK_NE(-1, (fd = open(path, O_RDONLY)), "%s", path);
CHECK_NE(-1, fstat(fd, &st));
CHECK_GT(st.st_size, 0);
CHECK_LE(st.st_size, INT_MAX);
/* LOGIFNEG1(fadvise(fd, 0, 0, MADV_WILLNEED | MADV_SEQUENTIAL)); */
CHECK_NE(MAP_FAILED,
(map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0)));
CHECK_NOTNULL((data = stbi_load_from_memory(map, st.st_size, &gotx, &goty,
&channels_in_file, CN)),
"%s", path);
CHECK_NE(-1, munmap(map, st.st_size));
CHECK_NE(-1, close(fd));
#if 1
stbir_resize_uint8(data, gotx, goty, 0, rgb, xn * XS, yn * YS, 0, CN);
#else
CHECK_EQ(CN, 3);
data2size = ROUNDUP(sizeof(float) * goty * gotx * CN, FRAMESIZE);
data3size = ROUNDUP(sizeof(float) * yn * YS * xn * XS * CN, FRAMESIZE);
CHECK_NE(MAP_FAILED, (data2 = mapanon(data2size)));
CHECK_NE(MAP_FAILED, (data3 = mapanon(data3size)));
rgb2lin(goty * gotx * CN, data2, data);
lanczos3(yn * YS, xn * XS, data3, goty, gotx, data2, gotx * 3);
rgb2std(yn * YS * xn * XS * CN, rgb, data3);
CHECK_NE(-1, munmap(data2, data2size));
CHECK_NE(-1, munmap(data3, data3size));
#endif
free(data);
}
static int ParseNumberOption(const char *arg) {
long x;
x = strtol(arg, NULL, 0);
if (!(1 <= x && x <= INT_MAX)) {
fprintf(stderr, "invalid flexidecimal: %s\n\n", arg);
exit(EXIT_FAILURE);
}
return x;
}
static void PrintUsage(int rc, FILE *f) {
fputs(HELPTEXT, f);
exit(rc);
}
static void GetOpts(int argc, char *argv[]) {
int opt;
while ((opt = getopt(argc, argv, "?Hmx:y:w:h:")) != -1) {
switch (opt) {
case 'w':
case 'x':
x_ = ParseNumberOption(optarg);
break;
case 'h':
case 'y':
y_ = ParseNumberOption(optarg);
break;
case 'm':
m_ = 1;
break;
case '?':
case 'H':
PrintUsage(EXIT_SUCCESS, stdout);
default:
PrintUsage(EX_USAGE, stderr);
}
}
}
int main(int argc, char *argv[]) {
int i;
void *rgb;
size_t size;
char *option;
unsigned yd, xd;
__fast_math();
showcrashreports();
GetOpts(argc, argv);
// if sizes are given, 2 cases:
// - positive values: use that as the target size
// - negative values: add, for ex to offset the command prompt size
GetTermSize(&yd, &xd);
if (y_ <= 0) {
y_ += yd;
}
if (x_ <= 0) {
x_ += xd;
}
// FIXME: on the conversion stage should do 2Y because of halfblocks
// printf( "filename >%s<\tx >%d<\ty >%d<\n\n", filename, x_, y_);
size = y_ * YS * x_ * XS * CN;
CHECK_NE(MAP_FAILED, (rgb = mapanon(ROUNDUP(size, FRAMESIZE))));
for (i = optind; i < argc; ++i) {
if (!argv[i]) continue;
if (m_) {
LoadFileViaImageMagick(argv[i], y_, x_, rgb);
} else {
LoadFile(argv[i], y_, x_, rgb);
}
PrintImage(y_, x_, rgb);
}
munmap(rgb, ROUNDUP(size, FRAMESIZE));
return 0;
}