/* See LICENSE file for copyright and license details. */
#include "libskrift.h"
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libsimple-arg.h>
#define TEST_TEXT "hello world"
USAGE("[-b background-colour] [-f foreground-colour] [-a opacity] [-t character-transformation] ... "
"[-T character-transformation] ... [-k kerning] [-i interletter-spacing] [-g grid_fineness] "
"[-S smoothing-method[:subpixel-order]] [-H hiniting] [-o flags] ... [-s font-size] [-F font-file] "
"[-D dpi-x:dpi-y | -D dpi] [-w width] [-h height] [-x x-position] [-y y-position] [text]");
static uint8_t
decode_hexbyte(char hi, char lo)
{
int ret;
ret = ((hi & 15) + 9 * (hi > '9')) << 4;
ret |= ((lo & 15) + 9 * (lo > '9')) << 0;
return (uint8_t)ret;
}
static void
parse_colour(const char *s, uint8_t *redp, uint8_t *greenp, uint8_t *bluep, uint8_t *alphap)
{
char rh, rl, gh, gl, bh, bl, ah = 'f', al = 'f';
if (!isxdigit(s[0])) goto invalid;
if (!isxdigit(s[1])) goto invalid;
if (!isxdigit(s[2])) goto invalid;
if (!isxdigit(s[3])) goto invalid;
if (!isxdigit(s[4])) goto invalid;
if (!isxdigit(s[5])) goto invalid;
rh = *s++;
rl = *s++;
gh = *s++;
gl = *s++;
bh = *s++;
bl = *s++;
if (*s) {
if (!isxdigit(s[0])) goto invalid;
if (!isxdigit(s[1])) goto invalid;
if (s[2])
goto invalid;
ah = *s++;
al = *s++;
}
*redp = decode_hexbyte(rh, rl);
*greenp = decode_hexbyte(gh, gl);
*bluep = decode_hexbyte(bh, bl);
*alphap = decode_hexbyte(ah, al);
return;
invalid:
fprintf(stderr, "%s: colours shall be encoded as rrggbb or rrggbbaa, in hexadecimal\n", argv0);
exit(1);
}
_LIBSKRIFT_GCC_ONLY(__attribute__((__pure__)))
static uint16_t
parse_uint16(const char *s)
{
uint16_t ret, digit;
for (ret = 0; *s; s++) {
if (!isdigit(*s))
usage();
digit = (uint16_t)(*s & 15);
if (ret > (UINT16_MAX - digit) / 10)
usage();
ret *= 10;
ret += digit;
}
return ret;
}
_LIBSKRIFT_GCC_ONLY(__attribute__((__pure__)))
static int16_t
parse_int16(const char *s, const char **end)
{
int16_t ret, digit;
int neg = 0;
if (*s == '+') {
s++;
} else if (*s == '-') {
neg = 1;
s++;
}
for (ret = 0; *s; s++) {
if (!isdigit(*s))
break;
digit = (int16_t)(*s & 15);
if (ret < (INT16_MIN + digit) / 10)
usage();
ret *= 10;
ret -= digit;
}
if (!neg)
ret = -ret;
*end = s;
return ret;
}
static void
parse_transformation(char *s, double matrix[6])
{
#define S(T) T, n = (sizeof(T) - 1)
#define S0(T) (n = (sizeof(T) - 1), T)
size_t n;
double f, x, y, m[6];
while (*s) {
if (*s == ',') {
s++;
} else if (!strncmp(s, S("rotate="))) {
s += n;
errno = 0;
f = strtod(s, &s);
if (errno)
goto invalid;
if (*s) {
if (s[0] == 'd' && s[1] == 'e' && s[2] == 'g') {
s += 3;
libskrift_add_rotation_degrees(matrix, f);
} else {
libskrift_add_rotation(matrix, f);
}
if (*s && *s != ',')
goto invalid;
}
} else if (!strncmp(s, S("shearx="))) {
s += n;
errno = 0;
f = strtod(s, &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_shear(matrix, f, 0);
} else if (!strncmp(s, S("sheary="))) {
s += n;
errno = 0;
f = strtod(s, &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_shear(matrix, 0, f);
} else if (!strncmp(s, S("shear="))) {
s += n;
errno = 0;
x = strtod(s, &s);
if (errno || *s != ':')
goto invalid;
y = strtod(&s[1], &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_shear(matrix, x, y);
} else if (!strncmp(s, S("scalex="))) {
s += n;
errno = 0;
f = strtod(s, &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_scaling(matrix, f, 1);
} else if (!strncmp(s, S("scaley="))) {
s += n;
errno = 0;
f = strtod(s, &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_scaling(matrix, 1, f);
} else if (!strncmp(s, S("scale="))) {
s += n;
errno = 0;
x = strtod(s, &s);
if (errno)
goto invalid;
if (*s == ':') {
y = strtod(&s[1], &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_scaling(matrix, x, y);
} else if (*s && *s != ',') {
goto invalid;
} else {
libskrift_add_scaling(matrix, x, x);
}
} else if (!strncmp(s, S("translate="))) {
s += n;
errno = 0;
x = strtod(s, &s);
if (errno || *s != ':')
goto invalid;
y = strtod(&s[1], &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_translation(matrix, x, y);
} else if (!strncmp(s, S("transform="))) {
s += n;
errno = 0;
m[0] = strtod(s, &s);
if (errno || *s != ':')
goto invalid;
m[1] = strtod(&s[1], &s);
if (errno || *s != ':')
goto invalid;
m[2] = strtod(&s[1], &s);
if (errno || s[0] != ':' || s[1] != ':')
goto invalid;
m[3] = strtod(&s[2], &s);
if (errno || *s != ':')
goto invalid;
m[4] = strtod(&s[1], &s);
if (errno || *s != ':')
goto invalid;
m[5] = strtod(&s[1], &s);
if (errno || (*s && *s != ','))
goto invalid;
libskrift_add_transformation(matrix, m);
} else if (!strncmp(s, S("rotate90,")) || !strcmp(s, S0("rotate90"))) {
s += n;
libskrift_add_90_degree_rotation(matrix);
} else if (!strncmp(s, S("rotate180,")) || !strcmp(s, S0("rotate180"))) {
s += n;
libskrift_add_180_degree_rotation(matrix);
} else if (!strncmp(s, S("rotate270,")) || !strcmp(s, S0("rotate270"))) {
s += n;
libskrift_add_270_degree_rotation(matrix);
} else if (!strncmp(s, S("transpose,")) || !strcmp(s, S0("transpose"))) {
s += n;
libskrift_add_transposition(matrix);
} else {
invalid:
fprintf(stderr, "%s: valid transformations are:\n", argv0);
fprintf(stderr, "%s: rotate=<radians>\n", argv0);
fprintf(stderr, "%s: rotate=<degrees>deg\n", argv0);
fprintf(stderr, "%s: shearx=<value>\n", argv0);
fprintf(stderr, "%s: sheary=<value>\n", argv0);
fprintf(stderr, "%s: shear=<x-value>:<y-value>\n", argv0);
fprintf(stderr, "%s: scalex=<value>\n", argv0);
fprintf(stderr, "%s: scaley=<value>\n", argv0);
fprintf(stderr, "%s: scale=<value>\n", argv0);
fprintf(stderr, "%s: scale=<x-value>:<y-value>\n", argv0);
fprintf(stderr, "%s: translate=<x-value>:<y-value>\n", argv0);
fprintf(stderr, "%s: transform=<r1c1>:<r1c2>:<r1c3>::<r2c1>:<r2c2>:<r2c3>\n", argv0);
fprintf(stderr, "%s: rotate90\n", argv0);
fprintf(stderr, "%s: rotate180\n", argv0);
fprintf(stderr, "%s: rotate270\n", argv0);
fprintf(stderr, "%s: transpose\n", argv0);
exit(1);
}
}
#undef S
#undef S0
}
static double
apply_unit(double size, const char *unit, const struct libskrift_rendering *rendering, const char *unit_for)
{
if (!strcmp(unit, "px"))
return size;
if (!strcmp(unit, "pt"))
return libskrift_points_to_pixels(size, rendering);
if (!strcmp(unit, "in"))
return libskrift_inches_to_pixels(size, rendering);
if (!strcmp(unit, "mm"))
return libskrift_millimeters_to_pixels(size, rendering);
if (!strcmp(unit, "cm"))
return libskrift_millimeters_to_pixels(size * 10, rendering);
fprintf(stderr, "%s: valid %s units are: 'px', 'pt', 'in', 'mm', 'cm'", argv0, unit_for);
exit(1);
}
int
main(int argc, char *argv[])
{
LIBSKRIFT_FONT *font;
LIBSKRIFT_CONTEXT *ctx;
struct libskrift_image image = {LIBSKRIFT_R8G8B8A8, LIBSKRIFT_BE_SUBPIXEL, 0, 800, 600, 0, NULL, NULL, NULL};
struct libskrift_rendering rendering = LIBSKRIFT_DEFAULT_RENDERING;
struct libskrift_colour colour;
const char *font_file = DEMO_FONT;
double font_size = 72;
const char *font_size_unit = "pt";
const char *x_unit = "", *y_unit = "";
const char *kerning_unit = "", *interletter_spacing_unit = "";
double height, opacity = .80f, f;
size_t size, i;
char *end, *arg;
const char *text = TEST_TEXT;
size_t text_length = sizeof(TEST_TEXT) - 1;
uint8_t background_red = 32U, foreground_red = 204U;
uint8_t background_green = 48U, foreground_green = 128U;
uint8_t background_blue = 64U, foreground_blue = 51U;
uint8_t background_alpha = 250U, foreground_alpha = 128U;
long int tmp_long;
int16_t x = 0, y = 300;
ARGBEGIN {
case 'b':
parse_colour(ARG(), &background_red, &background_green, &background_blue, &background_alpha);
break;
case 'f':
parse_colour(ARG(), &foreground_red, &foreground_green, &foreground_blue, &foreground_alpha);
break;
case 'F':
font_file = ARG();
break;
case 'a':
errno = 0;
opacity = strtod(ARG(), &end);
if (errno || *end)
usage();
break;
case 's':
errno = 0;
font_size = strtod(ARG(), &end);
if (errno)
usage();
font_size_unit = end;
break;
case 'S':
errno = 0;
arg = ARG();
if (!strncmp(arg, "monochrome", strlen("monochrome"))) {
arg += strlen("monochrome");
rendering.smoothing = LIBSKRIFT_MONOCHROME;
} else if (!strncmp(arg, "none", strlen("none"))) {
arg += strlen("none");
rendering.smoothing = LIBSKRIFT_NONE; /* = LIBSKRIFT_MONOCHROME */
} else if (!strncmp(arg, "greyscale", strlen("greyscale"))) {
arg += strlen("greyscale");
rendering.smoothing = LIBSKRIFT_GREYSCALE;
} else if (!strncmp(arg, "subpixel", strlen("subpixel"))) {
arg += strlen("subpixel");
rendering.smoothing = LIBSKRIFT_SUBPIXEL;
} else {
fprintf(stderr, "%s: valid smoothing methods are: 'monochrome', 'greyscale', 'subpixel'\n", argv0);
return 1;
}
if (!*arg) {
rendering.subpixel_order = LIBSKRIFT_RGB;
break;
}
if (*arg++ != ':')
usage();
if (!strcmp(arg, "other")) {
rendering.subpixel_order = LIBSKRIFT_OTHER;
} else if (!strcmp(arg, "none")) {
rendering.subpixel_order = LIBSKRIFT_NONE; /* = LIBSKRIFT_OTHER */
} else if (!strcmp(arg, "rgb")) {
rendering.subpixel_order = LIBSKRIFT_RGB;
} else if (!strcmp(arg, "bgr")) {
rendering.subpixel_order = LIBSKRIFT_BGR;
} else if (!strcmp(arg, "vrgb")) {
rendering.subpixel_order = LIBSKRIFT_VRGB;
} else if (!strcmp(arg, "vbgr")) {
rendering.subpixel_order = LIBSKRIFT_VBGR;
} else {
fprintf(stderr, "%s: valid subpixel orders are: 'other', 'rgb', 'bgr', 'vrgb', 'cbgr'\n", argv0);
return 1;
}
break;
case 'H':
arg = ARG();
if (!strcmp(arg, "none")) {
rendering.hinting = LIBSKRIFT_NONE;
} else if (!strcmp(arg, "unhinted")) {
rendering.hinting = LIBSKRIFT_UNHINTED; /* = LIBSKRIFT_NONE */
} else if (!strcmp(arg, "slight")) {
rendering.hinting = LIBSKRIFT_SLIGHT;
} else if (!strcmp(arg, "medium")) {
rendering.hinting = LIBSKRIFT_MEDIUM;
} else if (!strcmp(arg, "full")) {
rendering.hinting = LIBSKRIFT_FULL;
} else if (isdigit(*arg)) {
rendering.hinting = 0;
for (; isdigit(*arg); arg++) {
rendering.hinting *= 10;
rendering.hinting += *arg & 15;
}
if (*arg)
usage();
} else {
fprintf(stderr, "%s: valid hintings are: 'none', 'slight', 'medium', 'full', <integer>\n", argv0);
return 1;
}
break;
case 'D':
errno = 0;
rendering.horizontal_dpi = strtod(ARG(), &end);
if (errno)
usage();
if (!*end) {
rendering.vertical_dpi = rendering.horizontal_dpi;
} else if (*end != ':') {
usage();
} else {
rendering.vertical_dpi = strtod(&end[1], &end);
if (errno || *end)
usage();
}
break;
case 'w':
image.width = parse_uint16(ARG());
break;
case 'h':
image.height = parse_uint16(ARG());
break;
case 'x':
x = parse_int16(ARG(), &x_unit);
break;
case 'y':
y = parse_int16(ARG(), &y_unit);
break;
case 't':
parse_transformation(ARG(), rendering.char_transformation);
break;
case 'T':
parse_transformation(ARG(), rendering.text_transformation);
break;
case 'k':
errno = 0;
rendering.kerning = strtod(ARG(), &end);
if (errno)
usage();
kerning_unit = end;
break;
case 'i':
errno = 0;
rendering.interletter_spacing = strtod(ARG(), &end);
if (errno)
usage();
interletter_spacing_unit = end;
break;
case 'g':
errno = 0;
tmp_long = strtol(ARG(), &end, 10);
rendering.grid_fineness = (int)tmp_long;
if (errno || *end || tmp_long < INT_MIN || tmp_long > INT_MAX)
usage();
break;
case 'o':
arg = ARG();
while (*arg) {
if (*arg == ',') {
arg++;
continue;
}
#define TEST(T) strncmp(arg, T, sizeof(T) - 1) ? 0 : (arg += sizeof(T) - 1, 1)
if (TEST("remove-gamma")) {
rendering.flags |= LIBSKRIFT_REMOVE_GAMMA;
} else if (TEST("y-increases-upwards")) {
rendering.flags |= LIBSKRIFT_Y_INCREASES_UPWARDS;
} else if (TEST("flip-text")) {
rendering.flags ^= LIBSKRIFT_FLIP_TEXT;
} else if (TEST("flip-chars")) {
rendering.flags ^= LIBSKRIFT_FLIP_CHARS;
} else if (TEST("mirror-text")) {
rendering.flags ^= LIBSKRIFT_MIRROR_TEXT;
} else if (TEST("mirror-chars")) {
rendering.flags ^= LIBSKRIFT_MIRROR_CHARS;
} else if (TEST("transpose-text")) {
rendering.flags ^= LIBSKRIFT_TRANSPOSE_TEXT;
} else if (TEST("transpose-chars")) {
rendering.flags ^= LIBSKRIFT_TRANSPOSE_CHARS;
} else if (TEST("no-ligatures")) {
rendering.flags |= LIBSKRIFT_NO_LIGATURES;
} else if (TEST("advance-char-to-grid")) {
rendering.flags |= LIBSKRIFT_ADVANCE_CHAR_TO_GRID;
} else if (TEST("regress-char-to-grid")) {
rendering.flags |= LIBSKRIFT_REGRESS_CHAR_TO_GRID;
} else if (TEST("advance-word-to-grid")) {
rendering.flags |= LIBSKRIFT_ADVANCE_WORD_TO_GRID;
} else if (TEST("regress-word-to-grid")) {
rendering.flags |= LIBSKRIFT_REGRESS_WORD_TO_GRID;
} else if (TEST("use-subpixel-grid")) {
rendering.flags |= LIBSKRIFT_USE_SUBPIXEL_GRID;
} else if (TEST("vertical-text")) {
rendering.flags |= LIBSKRIFT_VERTICAL_TEXT;
} else if (TEST("autohinting")) {
rendering.flags |= LIBSKRIFT_AUTOHINTING;
} else if (TEST("no-autohinting")) {
rendering.flags |= LIBSKRIFT_NO_AUTOHINTING;
} else if (TEST("autokerning")) {
rendering.flags |= LIBSKRIFT_AUTOKERNING;
} else if (TEST("no-autokerning")) {
rendering.flags |= LIBSKRIFT_NO_AUTOKERNING;
} else if (TEST("ignore-ignorable")) {
rendering.flags |= LIBSKRIFT_IGNORE_IGNORABLE;
} else {
invalid_flag:
fprintf(stderr, "%s: valid flags are:\n", argv0);
fprintf(stderr, "%s: remove-gamma\n", argv0);
fprintf(stderr, "%s: y-increases-upwards\n", argv0);
fprintf(stderr, "%s: flip-text\n", argv0);
fprintf(stderr, "%s: flip-chars\n", argv0);
fprintf(stderr, "%s: mirror-text\n", argv0);
fprintf(stderr, "%s: mirror-chars\n", argv0);
fprintf(stderr, "%s: transpose-text\n", argv0);
fprintf(stderr, "%s: transpose-chars\n", argv0);
fprintf(stderr, "%s: no-ligatures\n", argv0);
fprintf(stderr, "%s: advance-char-to-grid\n", argv0);
fprintf(stderr, "%s: regress-char-to-grid\n", argv0);
fprintf(stderr, "%s: advance-word-to-grid\n", argv0);
fprintf(stderr, "%s: regress-word-to-grid\n", argv0);
fprintf(stderr, "%s: use-subpixel-grid\n", argv0);
fprintf(stderr, "%s: vertical-text\n", argv0);
fprintf(stderr, "%s: autohinting\n", argv0);
fprintf(stderr, "%s: no-autohinting\n", argv0);
fprintf(stderr, "%s: autokerning\n", argv0);
fprintf(stderr, "%s: no-autokerning\n", argv0);
fprintf(stderr, "%s: ignore-ignorable\n", argv0);
return 1;
}
#undef TEST
if (*arg && *arg != ',')
goto invalid_flag;
}
break;
default:
usage();
} ARGEND;
colour = (struct libskrift_colour)LIBSKRIFT_PREMULTIPLY((float)opacity,
(float)foreground_alpha / 255,
(float)foreground_red / 255,
(float)foreground_green / 255,
(float)foreground_blue / 255);
if (argc > 1)
usage();
if (argc == 1) {
text = argv[0];
text_length = strlen(text);
}
if (isatty(STDOUT_FILENO)) {
fprintf(stderr, "Output file is a binary PAM image file, I am not writing that to a terminal.\n");
return 1;
}
if (*x_unit && strcmp(x_unit, "px")) {
f = (double)x;
f = apply_unit(f, x_unit, &rendering, "position");
x = (int16_t)f;
}
if (*y_unit && strcmp(y_unit, "px")) {
f = (double)y;
f = apply_unit(f, y_unit, &rendering, "position");
y = (int16_t)f;
}
if (*kerning_unit && strcmp(kerning_unit, "px")) {
f = rendering.kerning;
f = apply_unit(f, kerning_unit, &rendering, "spacing");
rendering.kerning = f;
}
if (*interletter_spacing_unit && strcmp(interletter_spacing_unit, "px")) {
f = rendering.interletter_spacing;
f = apply_unit(f, interletter_spacing_unit, &rendering, "spacing");
rendering.interletter_spacing = f;
}
if (libskrift_open_font_file(&font, font_file)) {
perror("libskrift_open_font_file");
return 1;
}
height = apply_unit(font_size, font_size_unit, &rendering, "font size");
if (libskrift_create_context(&ctx, &font, 1, height, &rendering, NULL)) {
perror("libskrift_create_context");
return 1;
}
libskrift_close_font(font);
size = 4;
size *= (size_t)image.width;
size *= (size_t)image.height;
if (size) {
image.image = malloc(size);
if (!image.image) {
perror("malloc");
return 1;
}
}
for (i = 0; i < size; i += 4) {
((uint8_t *)image.image)[i + 0] = background_red;
((uint8_t *)image.image)[i + 1] = background_green;
((uint8_t *)image.image)[i + 2] = background_blue;
((uint8_t *)image.image)[i + 3] = background_alpha;
}
if (libskrift_draw_text(ctx, text, text_length, &colour, x, y, &image) < 0) {
perror("libskrift_draw_text");
return 1;
}
printf("P7\n");
printf("WIDTH %u\n", image.width);
printf("HEIGHT %u\n", image.height);
printf("DEPTH 4\n");
printf("MAXVAL 255\n");
printf("TUPLTYPE RGB_ALPHA\n");
printf("ENDHDR\n");
fwrite(image.image, 1, size, stdout);
fflush(stdout);
free(image.image);
libskrift_free_context(ctx);
return 0;
}
