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makegraphic.c
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makegraphic.c
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/*
* OID image generator by Matthias Bilger <[email protected]>
*
* This is an alternative to `tttool oid-code`
*/
#include <png.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <getopt.h>
/* A coloured pixel. */
typedef struct {
uint8_t set;
} pixel_t;
/* A picture. */
typedef struct {
pixel_t *pixels;
size_t width;
size_t height;
} bitmap_t;
int space = 10;
int width = 2;
static int verbose_flag = 0;
static int ting_flag = 0;
/* Given "bitmap", this returns the pixel of bitmap at the point
("x", "y"). */
static pixel_t * pixel_at (bitmap_t * bitmap, int x, int y)
{
return bitmap->pixels + bitmap->width * y + x;
}
/* Write "bitmap" to a PNG file specified by "path"; returns 0 on
success, non-zero on error. */
static int save_png_to_file (bitmap_t *bitmap, const char *path)
{
FILE * fp;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
size_t x, y;
png_byte ** row_pointers = NULL;
/* "status" contains the return value of this function. At first
it is set to a value which means 'failure'. When the routine
has finished its work, it is set to a value which means
'success'. */
int status = -1;
/* The following number is set by trial and error only. I cannot
see where it it is documented in the libpng manual.
*/
int pixel_size = 3;
int depth = 8;
fp = fopen (path, "wb");
if (! fp) {
goto fopen_failed;
}
png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
goto png_create_write_struct_failed;
}
info_ptr = png_create_info_struct (png_ptr);
if (info_ptr == NULL) {
goto png_create_info_struct_failed;
}
/* Set up error handling. */
if (setjmp (png_jmpbuf (png_ptr))) {
goto png_failure;
}
/* Set image attributes. */
png_set_IHDR (png_ptr,
info_ptr,
bitmap->width,
bitmap->height,
depth,
PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
/* Set the resolution */
png_set_pHYs(png_ptr, info_ptr, 47244, 47244,
PNG_RESOLUTION_METER) ;
/* Initialize rows of PNG. */
row_pointers = png_malloc (png_ptr, bitmap->height * sizeof (png_byte *));
for (y = 0; y < bitmap->height; ++y) {
png_byte *row =
png_malloc (png_ptr, sizeof (uint8_t) * bitmap->width * pixel_size);
row_pointers[y] = row;
for (x = 0; x < bitmap->width; ++x) {
pixel_t * pixel = pixel_at (bitmap, x, y);
*row++ = (pixel->set)?0:255;
*row++ = (pixel->set)?0:255;
*row++ = (pixel->set)?0:255;
}
}
/* Write the image data to "fp". */
png_init_io (png_ptr, fp);
png_set_rows (png_ptr, info_ptr, row_pointers);
png_write_png (png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
/* The routine has successfully written the file, so we set
"status" to a value which indicates success. */
status = 0;
for (y = 0; y < bitmap->height; y++) {
png_free (png_ptr, row_pointers[y]);
}
png_free (png_ptr, row_pointers);
png_failure:
png_create_info_struct_failed:
png_destroy_write_struct (&png_ptr, &info_ptr);
png_create_write_struct_failed:
fclose (fp);
fopen_failed:
return status;
}
typedef struct {
uint8_t value[9];
} field;
static int calculateChecksum(int dec) {
int checksum = 0;
if(ting_flag){
checksum = (((dec >> 2) ^ (dec >> 8) ^ (dec >> 12) ^ (dec >> 14)) & 0x01) << 1;
checksum |= (((dec) ^ (dec >> 4) ^ (dec >> 6) ^ (dec >> 10)) & 0x01);
}else{
checksum = (((dec >> 2) ^ (dec >> 8) ^ (dec >> 12) ^ (dec >> 14)) & 0x01) << 1;
checksum |= (((dec) ^ (dec >> 4) ^ (dec >> 6) ^ (dec >> 10)) & 0x01);
checksum ^= 0x02; //needs to be tested
}
return checksum;
}
field create_field(int value){
field tmp = {.value = 0};
int counter = 0;
tmp.value[8] = calculateChecksum(value);
while (value){
tmp.value[counter] = value%4;
value = value/4;
counter++;
}
return tmp;
}
/* Sets a single pixel to the absolute x and y coordinate */
void set_pixel(bitmap_t* image, int x, int y){
pixel_t* pixel = pixel_at (image, x, y);
if(verbose_flag){
printf("Set pixel at %i, %i\n", x,y);
}
pixel->set = 1;
}
/* Sets a set of 4 pixel, x and y are absolute */
void set_pixels(bitmap_t* image, int x, int y){
set_pixel(image, x, y);
set_pixel(image, x+1, y);
set_pixel(image, x, y+1);
set_pixel(image, x+1, y+1);
}
void makeAbsoluteCoordinates(int* x, int* y){
*x*=(width + space);
*y*=(width + space);
}
void set_frame(bitmap_t* image, int x, int y){
makeAbsoluteCoordinates(&x, &y);
set_pixels(image, x, y);
}
void set_frame_marker(bitmap_t* image, int x, int y){
makeAbsoluteCoordinates(&x, &y);
set_pixels(image, x+1, y);
}
void set_point(bitmap_t* image, int value, int x, int y){
makeAbsoluteCoordinates(&x, &y);
x += ((value == 0 || value == 3)?1:-1)*2;
y += ((value == 0 || value == 1)?1:-1)*2;
set_pixels(image, x, y);
}
int main (int argc, char* argv[])
{
bitmap_t image;
int x;
int y;
field myfield;
char *filename;
int c;
image.width = 1000;
image.height = 1000;
int option_index = 0;
while (1)
{
static struct option long_options[] = {
{"sizex",required_argument,0,'x'},
{"sizey",required_argument,0,'y'},
{"file",required_argument,0,'f'},
{0,0,0,0}};
/* getopt_long stores the option index here. */
c = getopt_long (argc, argv, "x:y:f:",
long_options, &option_index);
/* Detect the end of the options. */
if (c == -1)
break;
switch (c)
{
case 'x':
image.width = atoi(optarg);
break;
case 'y':
image.height = atoi(optarg);
break;
case 'f':
filename = optarg;
break;
case '?':
/* getopt_long already printed an error message. */
break;
default:
abort ();
}
}
myfield = create_field(atoi(argv[option_index]));
printf("Checksum is: %i\n", myfield.value[8]);
/* Create an image. */
image.pixels = calloc (sizeof (pixel_t), image.width * image.height);
for (y = 0; y < image.height/(space + width); y++) {
for (x = 0; x < image.width/(space + width); x++) {
int fieldx = x & 3;
int fieldy = y & 3;
if(fieldx == 0 && fieldy == 2){
set_frame_marker(&image, x,y);
}else
if(fieldx == 0 || fieldy == 0){
set_frame(&image, x,y);
}
else{
set_point(&image, myfield.value[8-(fieldx-1)-((fieldy-1)*3)], x,y);
}
}
}
/* Write the image to a file 'fruit.png'. */
save_png_to_file (&image, filename);
return 0;
}