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png2pos.c
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png2pos.c
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/*!
(c) 2012 - 2015 Petr Kutalek: png2pos
Licensed under the MIT License:
Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
- The above copyright notice and this permission notice shall be included in all copies
or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <getopt.h>
#include "lodepng.h"
const char *PNG2POS_VERSION = "1.6.4";
const char *PNG2POS_BUILTON = __DATE__;
// modified lodepng allocators
void* lodepng_malloc(size_t size) {
return calloc(size, sizeof(char));
}
void* lodepng_realloc(void *ptr, size_t new_size) {
return realloc(ptr, new_size);
}
void lodepng_free(void *ptr) {
free(ptr);
}
// ESC sequences
#define ESC_INIT_LENGTH 2
const unsigned char ESC_INIT[ESC_INIT_LENGTH] = {
// ESC @, Initialize printer, p. 412
0x1b, 0x40
};
#define ESC_CUT_LENGTH 4
const unsigned char ESC_CUT[ESC_CUT_LENGTH] = {
// GS V, Sub-Function B, p. 373
0x1d, 0x56, 0x41,
// Feeds paper to (cutting position + n × vertical motion unit)
// and executes a full cut (cuts the paper completely)
// The vertical motion unit is specified by GS P.
0x40
};
#define ESC_OFFSET_LENGTH 4
unsigned char ESC_OFFSET[ESC_OFFSET_LENGTH] = {
// GS L, Set left margin, p. 169
0x1d, 0x4c,
// nl, nh
0x00, 0x00
};
#define ESC_STORE_LENGTH 17
unsigned char ESC_STORE[ESC_STORE_LENGTH] = {
// GS 8 L, Store the graphics data in the print buffer (raster format), p. 252
0x1d, 0x38, 0x4c,
// p1 p2 p3 p4
0x0b, 0x00, 0x00, 0x00,
// Function 112
0x30, 0x70, 0x30,
// bx by, zoom
0x01, 0x01,
// c, single-color printing model
0x31,
// xl, xh, number of dots in the horizontal direction
0x00, 0x00,
// yl, yh, number of dots in the vertical direction
0x00, 0x00
};
#define ESC_FLUSH_LENGTH 7
const unsigned char ESC_FLUSH[ESC_FLUSH_LENGTH] = {
// GS ( L, Print the graphics data in the print buffer, p. 241
// Moves print position to the left side of the print area after
// printing of graphics data is completed
0x1d, 0x28, 0x4c, 0x02, 0x00, 0x30,
// Fn 50
0x32
};
// number of dots/lines in vertical direction in one F112 command
// set to <= 128u for Epson TM-J2000/J2100
#ifndef GS8L_MAX_Y
#define GS8L_MAX_Y 256u
#endif
// max image width printer is able to process
#ifndef PRINTER_MAX_WIDTH
#define PRINTER_MAX_WIDTH 512u
#endif
// app configuration
struct {
unsigned int cut;
unsigned int photo;
char align;
unsigned int rotate;
const char *output;
unsigned int threshold;
} config = {
.cut = 0,
.photo = 0,
.align = '?',
.rotate = 0,
.output = NULL,
.threshold = 0x80
};
// Gamma 2.2 lookup table
const unsigned char GAMMA_22[256] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
0x02, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05, 0x06,
0x06, 0x06, 0x07, 0x07, 0x07, 0x08, 0x08, 0x08, 0x09, 0x09, 0x09, 0x0a, 0x0a, 0x0a, 0x0b, 0x0b,
0x0c, 0x0c, 0x0d, 0x0d, 0x0d, 0x0e, 0x0e, 0x0f, 0x0f, 0x10, 0x10, 0x11, 0x11, 0x12, 0x12, 0x13,
0x13, 0x14, 0x15, 0x15, 0x16, 0x16, 0x17, 0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1b, 0x1c, 0x1d,
0x1d, 0x1e, 0x1f, 0x1f, 0x20, 0x21, 0x21, 0x22, 0x23, 0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x5a,
0x5b, 0x5c, 0x5d, 0x5f, 0x60, 0x61, 0x63, 0x64, 0x65, 0x67, 0x68, 0x69, 0x6b, 0x6c, 0x6d, 0x6f,
0x70, 0x72, 0x73, 0x75, 0x76, 0x77, 0x79, 0x7a, 0x7c, 0x7d, 0x7f, 0x80, 0x82, 0x83, 0x85, 0x87,
0x88, 0x8a, 0x8b, 0x8d, 0x8e, 0x90, 0x92, 0x93, 0x95, 0x97, 0x98, 0x9a, 0x9c, 0x9d, 0x9f, 0xa1,
0xa2, 0xa4, 0xa6, 0xa8, 0xa9, 0xab, 0xad, 0xaf, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbb, 0xbd,
0xbf, 0xc1, 0xc3, 0xc5, 0xc7, 0xc9, 0xcb, 0xcd, 0xcf, 0xd1, 0xd3, 0xd5, 0xd7, 0xd9, 0xdb, 0xdd,
0xdf, 0xe1, 0xe3, 0xe5, 0xe7, 0xe9, 0xeb, 0xed, 0xef, 0xf1, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xff
};
// Lightness lookup table
const unsigned char LIGHTNESS[256] = {
0x00, 0x05, 0x11, 0x1a, 0x21, 0x26, 0x2b, 0x30, 0x34, 0x38, 0x3b, 0x3e, 0x41, 0x44, 0x47, 0x4a,
0x4c, 0x4f, 0x51, 0x53, 0x55, 0x57, 0x59, 0x5b, 0x5d, 0x5f, 0x61, 0x63, 0x64, 0x66, 0x68, 0x69,
0x6b, 0x6c, 0x6e, 0x6f, 0x71, 0x72, 0x74, 0x75, 0x76, 0x78, 0x79, 0x7a, 0x7b, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90,
0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac,
0xac, 0xad, 0xae, 0xae, 0xaf, 0xb0, 0xb1, 0xb1, 0xb2, 0xb3, 0xb3, 0xb4, 0xb5, 0xb6, 0xb6, 0xb7,
0xb8, 0xb8, 0xb9, 0xba, 0xba, 0xbb, 0xbb, 0xbc, 0xbd, 0xbd, 0xbe, 0xbf, 0xbf, 0xc0, 0xc1, 0xc1,
0xc2, 0xc2, 0xc3, 0xc4, 0xc4, 0xc5, 0xc5, 0xc6, 0xc7, 0xc7, 0xc8, 0xc8, 0xc9, 0xc9, 0xca, 0xcb,
0xcb, 0xcc, 0xcc, 0xcd, 0xcd, 0xce, 0xcf, 0xcf, 0xd0, 0xd0, 0xd1, 0xd1, 0xd2, 0xd2, 0xd3, 0xd3,
0xd4, 0xd4, 0xd5, 0xd6, 0xd6, 0xd7, 0xd7, 0xd8, 0xd8, 0xd9, 0xd9, 0xda, 0xda, 0xdb, 0xdb, 0xdc,
0xdc, 0xdd, 0xdd, 0xde, 0xde, 0xdf, 0xdf, 0xe0, 0xe0, 0xe0, 0xe1, 0xe1, 0xe2, 0xe2, 0xe3, 0xe3,
0xe4, 0xe4, 0xe5, 0xe5, 0xe6, 0xe6, 0xe7, 0xe7, 0xe7, 0xe8, 0xe8, 0xe9, 0xe9, 0xea, 0xea, 0xeb,
0xeb, 0xec, 0xec, 0xec, 0xed, 0xed, 0xee, 0xee, 0xef, 0xef, 0xef, 0xf0, 0xf0, 0xf1, 0xf1, 0xf2,
0xf2, 0xf2, 0xf3, 0xf3, 0xf4, 0xf4, 0xf4, 0xf5, 0xf5, 0xf6, 0xf6, 0xf7, 0xf7, 0xf7, 0xf8, 0xf8,
0xf9, 0xf9, 0xf9, 0xfa, 0xfa, 0xfb, 0xfb, 0xfb, 0xfc, 0xfc, 0xfd, 0xfd, 0xfd, 0xfe, 0xfe, 0xff
};
FILE *fout = NULL;
inline int rebound(const int value, const int min, const int max) {
int a = value;
if (a < min) {
a = min;
}
else if (a > max) {
a = max;
}
return a;
}
char* basename(const char *s) {
char *r = (char*)s;
while (*s) {
if (*s++ == '/') {
r = (char*)s;
}
}
return r;
}
void print(FILE *stream, const unsigned char *buffer, const int length) {
for (unsigned int i = 0; i != length; ++i) {
fputc(buffer[i], stream);
}
}
int main(int argc, char *argv[]) {
{
// PRINTER_MAX_WIDTH must be divisible by 8!!
if (PRINTER_MAX_WIDTH % 8 != 0) {
fprintf(stderr, "FATAL ERROR: PRINTER_MAX_WIDTH MUST BE DIVISIBLE BY 8, PLEASE RECOMPILE\n");
return EXIT_FAILURE;
}
}
unsigned char *img_rgba = NULL;
unsigned char *img_grey = NULL;
unsigned char *img_bw = NULL;
const char *BINARY_NAME = basename(argv[0]);
int ret = EXIT_FAILURE;
opterr = 0;
int optc = -1;
while ((optc = getopt(argc, argv, ":Vhca:rt:po:")) != -1) {
switch (optc) {
case 'o':
config.output = optarg;
break;
case 'c':
config.cut = 1;
break;
case 'a':
config.align = toupper(optarg[0]);
if (!strchr("LCR", config.align)) {
fprintf(stderr, "Unknown horizontal alignment '%c'\n", config.align);
goto fail;
}
break;
case 'r':
config.rotate = 1;
break;
case 't':
config.threshold = strtoul(optarg, NULL, 0);
if (config.threshold > 255) {
config.threshold = 0x80;
fprintf(stderr, "B/W threshold must be in the interval <0; 255>. Falling back to the default value 0x80\n");
}
break;
case 'p':
config.photo = 1;
break;
case 'V':
fprintf(stderr, "%s %s (%s)\n", BINARY_NAME, PNG2POS_VERSION, PNG2POS_BUILTON);
fprintf(stderr, "%s %s\n", "LodePNG", LODEPNG_VERSION_STRING);
ret = EXIT_SUCCESS;
goto fail;
case 'h':
fprintf(stderr,
"png2pos is a utility to convert PNG to ESC/POS\n"
"Usage: %s [-V] [-h] [-c] [-a L|C|R] [-r] [-t THRESHOLD] [-p] [-o FILE] input files\n"
"\n"
" -V display the version number and exit\n"
" -h display this short help and exit\n"
" -c cut the paper at the end of job\n"
" -a L|C|R horizontal image alignment (Left, Center, Right)\n"
" -r rotate image upside down before it is printed\n"
" -t THRESHOLD set the treshold value for conversion to B/W\n"
" -p switch to photo mode (pre-process input files)\n"
" -o FILE output file\n"
"\n"
"With no FILE, or when FILE is -, write to standard output\n"
"\n"
"Please read the manual page (man %s)\n"
"Report bugs at https://github.com/petrkutalek/png2pos/issues\n"
"(c) Petr Kutalek <petr@kutalek.cz>, 2012 - 2015, Licensed under the MIT license\n"
,
BINARY_NAME, BINARY_NAME
);
ret = EXIT_SUCCESS;
goto fail;
case ':':
fprintf(stderr, "Option '%c' requires an argument\n", optopt);
fprintf(stderr, "For usage options run '%s -h'\n", BINARY_NAME);
goto fail;
default:
case '?':
fprintf(stderr, "'%c' is an unknown option\n", optopt);
fprintf(stderr, "For usage options run '%s -h'\n", BINARY_NAME);
goto fail;
}
}
argc -= optind;
argv += optind;
optind = 0;
// open output file and disable line buffering
if (!config.output || strcmp(config.output, "-") == 0) {
fout = stdout;
} else if (!(fout = fopen(config.output, "wb"))) {
fprintf(stderr, "Could not open output file '%s'\n", config.output);
goto fail;
}
if (isatty(fileno(fout))) {
fprintf(stderr, "This utility produces binary sequence printer commands. Output have to be redirected\n");
goto fail;
}
if (setvbuf(fout, NULL, _IOFBF, 8192) != 0) {
fprintf(stderr, "Could not set new buffer policy on output stream\n");
}
// init printer
print(fout, ESC_INIT, ESC_INIT_LENGTH);
fflush(fout);
// for each input file
while (optind != argc) {
const char *input = argv[optind++];
// load RGBA PNG
unsigned int img_w = 0;
unsigned int img_h = 0;
unsigned int lodepng_error = lodepng_decode32_file(&img_rgba, &img_w, &img_h, input);
if (lodepng_error) {
fprintf(stderr, "Could not load and process input PNG file, %s\n", lodepng_error_text(lodepng_error));
goto fail;
}
if (img_w > PRINTER_MAX_WIDTH) {
fprintf(stderr, "Image width %u px exceeds the printer's capability (%u px)\n", img_w, PRINTER_MAX_WIDTH);
goto fail;
}
unsigned int histogram[256] = { 0 };
// convert RGBA to greyscale
const unsigned int img_grey_size = img_h * img_w;
img_grey = (unsigned char *)calloc(img_grey_size, 1);
if (!img_grey) {
fprintf(stderr, "Could not allocate enough memory\n");
goto fail;
}
// convert RGBA to greyscale
for (unsigned int i = 0; i != img_grey_size; ++i) {
// A
const unsigned int a = img_rgba[(i << 2) | 3];
// RGBA → RGB
const unsigned int r = (255 - a) + a / 255 * img_rgba[i << 2];
const unsigned int g = (255 - a) + a / 255 * img_rgba[(i << 2) | 1];
const unsigned int b = (255 - a) + a / 255 * img_rgba[(i << 2) | 2];
// RGB → R'G'B'
const unsigned int r_ = GAMMA_22[r];
const unsigned int g_ = GAMMA_22[g];
const unsigned int b_ = GAMMA_22[b];
// R'G'B' → luma Y' (!= luminance), CIE, BT.709
const unsigned int y_ = (55 * r_ + 182 * g_ + 18 * b_) / 255;
// Y' → lightness L*
img_grey[i] = LIGHTNESS[y_];
// prepare a histogram for HEA
++histogram[img_grey[i]];
}
free(img_rgba), img_rgba = NULL;
#ifdef DEBUG
lodepng_encode_file("debug/g.png", img_grey, img_w, img_h, LCT_GREY, 8);
// draw histogram via gnuplot, write dataset
FILE *fhist = fopen("debug/histogram.txt", "w");
if (fhist) {
fprintf(fhist, "#hue\tcount\n");
for (unsigned int i = 0; i != 256; ++i) {
fprintf(fhist, "%d\t%d\n", i, histogram[i]);
}
fprintf(fhist, "#EOF\n");
}
fclose(fhist), fhist = NULL;
#endif
{
// -p hints
unsigned int colors = 0;
for (unsigned int i = 0; i != 256; ++i) {
if (histogram[i] > 0) {
++colors;
}
}
if (colors < 16 && config.photo == 1) {
fprintf(stderr, "Image seems to be B/W. -p is probably not good option this time\n");
}
if (colors >= 16 && config.photo == 0) {
fprintf(stderr, "Image seems to be greyscale or colored. Maybe you should use options -p and -t for better results\n");
}
}
// post-processing
// convert to B/W bitmap
if (config.photo == 1) {
// Histogram Equalization Algorithm
for (unsigned int i = 1; i != 256; ++i) {
histogram[i] += histogram[i - 1];
}
for (unsigned int i = 0; i != img_grey_size; ++i) {
img_grey[i] = 255 * histogram[img_grey[i]] / img_grey_size;
}
config.threshold = 255 * histogram[config.threshold] / img_grey_size;
fprintf(stderr, "Threshold shift, new value = %d\n", config.threshold);
#ifdef DEBUG
lodepng_encode_file("debug/g_pp.png", img_grey, img_w, img_h, LCT_GREY, 8);
for (unsigned int i = 1; i != 256; ++i) {
histogram[i] = 0;
}
for (unsigned int i = 0; i != img_grey_size; ++i) {
++histogram[img_grey[i]];
}
// draw histogram via gnuplot, write dataset
FILE *fhist = fopen("debug/histogram_pp.txt", "w");
if (fhist) {
fprintf(fhist, "#hue\tcount\n");
for (unsigned int i = 0; i != 256; ++i) {
fprintf(fhist, "%d\t%d\n", i, histogram[i]);
}
fprintf(fhist, "#EOF\n");
}
fclose(fhist), fhist = NULL;
#endif
// Atkinson Dithering Algorithm
const struct {
int dx;
int dy;
} matrix[6] = {
{ .dx = 1, .dy = 0 },
{ .dx = 2, .dy = 0 },
{ .dx = -1, .dy = 1 },
{ .dx = 0, .dy = 1 },
{ .dx = 1, .dy = 1 },
{ .dx = 0, .dy = 2 }
};
for (unsigned int i = 0; i != img_grey_size; ++i) {
const unsigned int o = img_grey[i];
const unsigned int n = o <= config.threshold ? 0x00 : 0xff;
const int d = (signed int)(o - n) / 8;
img_grey[i] = n;
const unsigned int x = i % img_w;
const unsigned int y = i / img_w;
for (unsigned int j = 0; j != 6; ++j) {
const int x0 = x + matrix[j].dx;
const int y0 = y + matrix[j].dy;
if (x0 >= img_w || x0 < 0 || y0 >= img_h) {
continue;
}
img_grey[x0 + img_w * y0] = rebound(img_grey[x0 + img_w * y0] + d, 0x00, 0xff);
}
}
}
// canvas size is width of a picture rounded up to nearest multiple of 8
const unsigned int canvas_w = ((img_w + 7) >> 3) << 3;
const unsigned int img_bw_size = img_h * (canvas_w >> 3);
img_bw = (unsigned char *)calloc(img_bw_size, 1);
if (!img_bw) {
fprintf(stderr, "Could not allocate enough memory\n");
goto fail;
}
// align rotated image to the right border
if (config.rotate == 1 && config.align == '?') {
config.align = 'R';
}
// compress bytes into bitmap
for (unsigned int i = 0; i != img_grey_size; ++i) {
const unsigned int idx = config.rotate == 1 ? img_grey_size - 1 - i: i;
if (img_grey[idx] <= config.threshold) {
const unsigned int x = i % img_w;
const unsigned int y = i / img_w;
img_bw[(y * canvas_w + x) >> 3] |= 0x80 >> (x & 0x07);
}
}
free(img_grey), img_grey = NULL;
#ifdef DEBUG
//for (unsigned int i = 0; i != img_bw_size; ++i) {
// img_bw[i] = ~img_bw[i];
//}
lodepng_encode_file("debug/bw_inv.png", img_bw, canvas_w, img_h, LCT_GREY, 1);
#endif
// left offset
unsigned int offset = 0;
switch (config.align) {
case 'C':
offset = (PRINTER_MAX_WIDTH - canvas_w) >> 1;
break;
case 'R':
offset = PRINTER_MAX_WIDTH - canvas_w;
break;
case 'L':
case '?':
default:
offset = 0;
}
// offset have to be a multiple of 8
offset = (offset >> 3) << 3;
// chunking, l = lines already printed, currently processing a chunk of height k
for (unsigned int l = 0, k = GS8L_MAX_Y; l < img_h; l += k) {
if (k > img_h - l) {
k = img_h - l;
}
if (offset != 0) {
ESC_OFFSET[2] = offset & 0xff;
ESC_OFFSET[3] = offset >> 8 & 0xff;
print(fout, ESC_OFFSET, ESC_OFFSET_LENGTH);
}
const unsigned int f112_p = 10 + k * (canvas_w >> 3);
ESC_STORE[ 3] = f112_p & 0xff;
ESC_STORE[ 4] = f112_p >> 8 & 0xff;
ESC_STORE[13] = canvas_w & 0xff;
ESC_STORE[14] = canvas_w >> 8 & 0xff;
ESC_STORE[15] = k & 0xff;
ESC_STORE[16] = k >> 8 & 0xff;
print(fout, ESC_STORE, ESC_STORE_LENGTH);
print(fout, &img_bw[l * (canvas_w >> 3)], k * (canvas_w >> 3));
print(fout, ESC_FLUSH, ESC_FLUSH_LENGTH);
fflush(fout);
}
free(img_bw), img_bw = NULL;
}
if (config.cut == 1) {
// cut the paper
print(fout, ESC_CUT, ESC_CUT_LENGTH);
fflush(fout);
}
ret = EXIT_SUCCESS;
fail:
free(img_rgba), img_rgba = NULL;
free(img_grey), img_grey = NULL;
free(img_bw), img_bw = NULL;
if (fout != NULL && fout != stdout) {
fclose(fout), fout = NULL;
}
return ret;
}