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#include <stdio.h>
#include <stdlib.h>
#include <png.h>
#include <zbar.h>
zbar_image_scanner_t *scanner = NULL;
/* to complete a runnable example, this abbreviated implementation of
* get_data() will use libpng to read an image file. refer to libpng
* documentation for details
*/
static void get_data (const char *name,
int *width, int *height,
void **raw)
{
FILE *file = fopen(name, "rb");
if(!file) exit(2);
png_structp png =
png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if(!png) exit(3);
if(setjmp(png_jmpbuf(png))) exit(4);
png_infop info = png_create_info_struct(png);
if(!info) exit(5);
png_init_io(png, file);
png_read_info(png, info);
/* configure for 8bpp grayscale input */
int color = png_get_color_type(png, info);
int bits = png_get_bit_depth(png, info);
if(color & PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png);
if(color == PNG_COLOR_TYPE_GRAY && bits < 8)
png_set_gray_1_2_4_to_8(png);
if(bits == 16)
png_set_strip_16(png);
if(color & PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png);
if(color & PNG_COLOR_MASK_COLOR)
png_set_rgb_to_gray_fixed(png, 1, -1, -1);
/* allocate image */
*width = png_get_image_width(png, info);
*height = png_get_image_height(png, info);
*raw = malloc(*width * *height);
png_bytep rows[*height];
int i;
for(i = 0; i < *height; i++)
rows[i] = *raw + (*width * i);
png_read_image(png, rows);
}
int main (int argc, char **argv)
{
if(argc < 2) return(1);
/* create a reader */
scanner = zbar_image_scanner_create();
/* configure the reader */
zbar_image_scanner_set_config(scanner, 0, ZBAR_CFG_ENABLE, 1);
/* obtain image data */
int width = 0, height = 0;
void *raw = NULL;
get_data(argv[1], &width, &height, &raw);
/* wrap image data */
zbar_image_t *image = zbar_image_create();
zbar_image_set_format(image, *(int*)"Y800");
zbar_image_set_size(image, width, height);
zbar_image_set_data(image, raw, width * height, zbar_image_free_data);
/* scan the image for barcodes */
int n = zbar_scan_image(scanner, image);
/* extract results */
const zbar_symbol_t *symbol = zbar_image_first_symbol(image);
for(; symbol; symbol = zbar_symbol_next(symbol)) {
/* do something useful with results */
zbar_symbol_type_t typ = zbar_symbol_get_type(symbol);
const char *data = zbar_symbol_get_data(symbol);
printf("decoded %s symbol \"%s\"\n",
zbar_get_symbol_name(typ), data);
}
/* clean up */
zbar_image_destroy(image);
zbar_image_scanner_destroy(scanner);
return(0);
}
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