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cosmopolitan/tool/viz/printimage.c
Justine Tunney f4f4caab0e Add x86_64-linux-gnu emulator 
I wanted a tiny scriptable meltdown proof way to run userspace programs
and visualize how program execution impacts memory. It helps to explain
how things like Actually Portable Executable works. It can show you how
the GCC generated code is going about manipulating matrices and more. I
didn't feel fully comfortable with Qemu and Bochs because I'm not smart
enough to understand them. I wanted something like gVisor but with much
stronger levels of assurances. I wanted a single binary that'll run, on
all major operating systems with an embedded GPL barrier ZIP filesystem
that is tiny enough to transpile to JavaScript and run in browsers too.

https://justine.storage.googleapis.com/emulator625.mp4
2020-08-25 04:43:42 -07:00

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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/core/twixt8.h"
#include "dsp/scale/scale.h"
#include "dsp/tty/quant.h"
#include "dsp/tty/tty.h"
#include "libc/assert.h"
#include "libc/bits/bits.h"
#include "libc/bits/safemacros.h"
#include "libc/calls/calls.h"
#include "libc/calls/ioctl.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/winsize.h"
#include "libc/conv/conv.h"
#include "libc/dce.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/rand/rand.h"
#include "libc/runtime/gc.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.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/sysv/consts/termios.h"
#include "libc/x/x.h"
#include "third_party/getopt/getopt.h"
#include "third_party/stb/stb_image.h"
#include "tool/viz/lib/graphic.h"
static struct Flags {
const char *out;
bool subpixel;
bool unsharp;
bool dither;
bool ruler;
long half;
bool full;
long width;
long height;
enum TtyBlocksSelection blocks;
enum TtyQuantizationAlgorithm quant;
} g_flags;
static noreturn void PrintUsage(int rc, FILE *f) {
fprintf(f, "Usage: %s%s", program_invocation_name, "\
[FLAGS] [PATH]\n\
\n\
FLAGS\n\
\n\
-o PATH output path\n\
-w INT manual width\n\
-w INT manual height\n\
-4 unicode blocks\n\
-a ansi color mode\n\
-t true color mode\n\
-2 use half blocks\n\
-3 ibm cp437 blocks\n\
-f display full size\n\
-s unsharp sharpening\n\
-x xterm256 color mode\n\
-d hilbert curve dithering\n\
-r display pixel ruler on sides\n\
-p convert to subpixel layout\n\
-v increases verbosity\n\
-? shows this information\n\
\n\
EXAMPLES\n\
\n\
printimage.com -sxd lemurs.jpg # 256-color dither unsharp\n\
\n\
\n");
exit(rc);
}
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 GetOpts(int *argc, char *argv[]) {
int opt;
struct winsize ws;
g_flags.quant = kTtyQuantTrue;
g_flags.blocks = IsWindows() ? kTtyBlocksCp437 : kTtyBlocksUnicode;
if (*argc == 2 &&
(strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-help") == 0)) {
PrintUsage(EXIT_SUCCESS, stdout);
}
while ((opt = getopt(*argc, argv, "?vpfrtxads234o:w:h:")) != -1) {
switch (opt) {
case 'o':
g_flags.out = optarg;
break;
case 'd':
g_flags.dither = true;
break;
case 's':
g_flags.unsharp = true;
break;
case 'w':
g_flags.width = ParseNumberOption(optarg);
break;
case 'h':
g_flags.height = ParseNumberOption(optarg);
break;
case 'f':
g_flags.full = true;
break;
case '2':
g_flags.half = true;
break;
case 'r':
g_flags.ruler = true;
break;
case 'p':
g_flags.subpixel = true;
break;
case 'a':
g_flags.quant = kTtyQuantAnsi;
break;
case 'x':
g_flags.quant = kTtyQuantXterm256;
break;
case 't':
g_flags.quant = kTtyQuantTrue;
break;
case '3':
g_flags.blocks = kTtyBlocksCp437;
break;
case '4':
g_flags.blocks = kTtyBlocksUnicode;
break;
case 'v':
++g_loglevel;
break;
case '?':
PrintUsage(EXIT_SUCCESS, stdout);
default:
PrintUsage(EX_USAGE, stderr);
}
}
if (optind == *argc) {
if (!g_flags.out) g_flags.out = "-";
argv[(*argc)++] = "-";
}
if (!g_flags.full && (!g_flags.width || !g_flags.width)) {
ws.ws_col = 80;
ws.ws_row = 24;
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) != -1 ||
ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) {
g_flags.width = ws.ws_col * (1 + !g_flags.half);
g_flags.height = ws.ws_row * 2;
}
}
ttyquantsetup(g_flags.quant, kTtyQuantRgb, g_flags.blocks);
}
static unsigned char ChessBoard(unsigned y, unsigned x, unsigned char a,
unsigned char b) {
return !((y ^ x) & (1u << 2)) ? a : b;
}
static unsigned char AlphaBackground(unsigned y, unsigned x) {
return ChessBoard(y, x, 255, 200);
}
static unsigned char OutOfBoundsBackground(unsigned y, unsigned x) {
return ChessBoard(y, x, 40, 80);
}
static void PrintRulerRight(long yn, long xn, long y, long x,
bool *inout_didhalfy) {
if (y == 0) {
printf("\e[0m‾0");
} else if (yn / 2 <= y && y <= yn / 2 + 1 && !*inout_didhalfy) {
printf("\e[0m‾%s%s", "yn/2", y % 2 ? "+1" : "");
*inout_didhalfy = true;
} else if (y + 1 == yn / 2 && !*inout_didhalfy) {
printf("\e[0m⎯yn/2");
*inout_didhalfy = true;
} else if (y + 1 == yn) {
printf("\e[0m⎯yn");
} else if (y + 2 == yn) {
printf("\e[0m_yn");
} else if (!(y % 10)) {
printf("\e[0m‾%,u", y);
}
}
static void PrintImageImpl(long syn, long sxn, unsigned char RGB[3][syn][sxn],
long y0, long yn, long x0, long xn, long dy,
long dx) {
long y, x;
bool didhalfy, didfirstx;
unsigned char a[3], b[3];
didhalfy = false;
for (y = y0; y < yn; y += dy) {
didfirstx = false;
if (y) printf("\e[0m\n");
for (x = x0; x < xn; x += dx) {
a[0] = RGB[0][y][x];
a[1] = RGB[1][y][x];
a[2] = RGB[2][y][x];
if (y + dy < yn && x + dx < xn) {
b[0] = RGB[0][y + dy][x + dx];
b[1] = RGB[1][y + dy][x + dx];
b[2] = RGB[2][y + dy][x + dx];
} else {
b[2] = b[1] = b[0] = OutOfBoundsBackground(y + dy, x + dx);
}
printf("\e[48;2;%d;%d;%d;38;2;%d;%d;%dm%lc", a[0], a[1], a[2], b[0], b[1],
b[2], dy > 1 ? u'▄' : u'▐');
didfirstx = true;
}
if (g_flags.ruler) {
PrintRulerRight(yn, xn, y, x, &didhalfy);
}
}
printf("\e[0m\n");
}
static void PrintImage(long syn, long sxn, unsigned char RGB[3][syn][sxn],
long y0, long yn, long x0, long xn) {
PrintImageImpl(syn, sxn, RGB, y0, yn, x0, xn, 2, 1);
}
static void PrintImageLR(long syn, long sxn, unsigned char RGB[3][syn][sxn],
long y0, long yn, long x0, long xn) {
PrintImageImpl(syn, sxn, RGB, y0, yn, x0, xn, 1, 2);
}
static void *Deblinterlace(long dyn, long dxn, unsigned char dst[3][dyn][dxn],
long syn, long sxn, long scn,
const unsigned char src[syn][sxn][scn], long y0,
long yn, long x0, long xn) {
long y, x;
unsigned char c;
for (y = y0; y < yn; ++y) {
for (x = x0; x < xn; ++x) {
switch (scn) {
case 1:
c = src[y][x][0];
dst[0][y][x] = c;
dst[1][y][x] = c;
dst[2][y][x] = c;
break;
case 2:
c = twixt8(AlphaBackground(y, x), src[y][x][0], src[y][x][1]);
dst[0][y][x] = c;
dst[1][y][x] = c;
dst[2][y][x] = c;
break;
case 3:
dst[0][y][x] = src[y][x][0];
dst[1][y][x] = src[y][x][1];
dst[2][y][x] = src[y][x][2];
break;
case 4:
c = AlphaBackground(y, x);
dst[0][y][x] = twixt8(c, src[y][x][0], src[y][x][3]);
dst[1][y][x] = twixt8(c, src[y][x][1], src[y][x][3]);
dst[2][y][x] = twixt8(c, src[y][x][2], src[y][x][3]);
break;
}
}
}
return dst;
}
static void *DeblinterlaceSubpixelBgr(long dyn, long dxn,
unsigned char dst[3][dyn][dxn][3],
long syn, long sxn,
const unsigned char src[syn][sxn][4],
long y0, long yn, long x0, long xn) {
long y, x;
for (y = y0; y < yn; ++y) {
for (x = x0; x < xn; ++x) {
dst[0][y][x][0] = 0;
dst[1][y][x][0] = 0;
dst[2][y][x][0] = src[y][x][2];
dst[0][y][x][1] = 0;
dst[1][y][x][1] = src[y][x][1];
dst[2][y][x][1] = 0;
dst[0][y][x][2] = src[y][x][0];
dst[1][y][x][2] = 0;
dst[2][y][x][2] = 0;
}
}
return dst;
}
static void PrintImageSerious(long yn, long xn, unsigned char RGB[3][yn][xn],
struct TtyRgb TTY[yn][xn], char *vt) {
char *p;
long y, x;
struct TtyRgb bg = {0x12, 0x34, 0x56, 0};
struct TtyRgb fg = {0x12, 0x34, 0x56, 0};
if (g_flags.unsharp) unsharp(3, yn, xn, RGB, yn, xn);
if (g_flags.dither) dither(yn, xn, RGB, yn, xn);
for (y = 0; y < yn; ++y) {
for (x = 0; x < xn; ++x) {
TTY[y][x] = rgb2tty(RGB[0][y][x], RGB[1][y][x], RGB[2][y][x]);
}
}
p = ttyraster(vt, (void *)TTY, yn, xn, bg, fg);
p = stpcpy(p, "\r\e[0m");
ttywrite(STDOUT_FILENO, vt, p - vt);
}
static void ProcessImage(long yn, long xn, unsigned char RGB[3][yn][xn]) {
if (g_flags.half) {
if (g_flags.subpixel) {
PrintImageLR(yn, xn * 3, RGB, 0, yn, 0, xn * 3);
} else {
PrintImage(yn, xn, RGB, 0, yn, 0, xn);
}
} else {
PrintImageSerious(
yn, xn, RGB, gc(memalign(32, sizeof(struct TtyRgb) * yn * xn)),
gc(memalign(32, ((yn * xn * strlen("\e[48;2;255;48;2;255m▄")) +
(yn * strlen("\e[0m\r\n")) + 128))));
}
}
void WithImageFile(const char *path,
void fn(long yn, long xn, unsigned char RGB[3][yn][xn])) {
struct stat st;
void *map, *data, *data2;
int fd, yn, xn, cn, dyn, dxn;
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);
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 = gc(stbi_load_from_memory(map, st.st_size, &xn, &yn, &cn, 0))),
"%s", path);
CHECK_NE(-1, munmap(map, st.st_size));
CHECK_NE(-1, close(fd));
if (g_flags.subpixel) {
data = DeblinterlaceSubpixelBgr(yn, xn, gc(memalign(32, yn * xn * 4 * 3)),
yn, xn, data, 0, yn, 0, xn);
xn *= 3;
} else {
data = Deblinterlace(yn, xn, gc(memalign(32, yn * xn * 4)), yn, xn, cn,
data, 0, yn, 0, xn);
cn = 3;
}
if (g_flags.height && g_flags.width) {
dyn = g_flags.height;
dxn = g_flags.width;
data = EzGyarados(3, dyn, dxn, gc(memalign(32, dyn * dxn * 3)), cn, yn, xn,
data, 0, cn, dyn, dxn, yn, xn, 0, 0, 0, 0);
yn = dyn;
xn = dxn;
}
fn(yn, xn, data);
}
int main(int argc, char *argv[]) {
int i;
cancolor();
GetOpts(&argc, argv);
stbi_set_unpremultiply_on_load(true);
for (i = optind; i < argc; ++i) {
WithImageFile(argv[i], ProcessImage);
}
return 0;
}
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