LICENSE

Diff: zbar/scan_image.c

Revision:

0:56c5742b9e2b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/zbar/scan_image.c	Tue Apr 19 02:00:37 2016 +0000
@@ -0,0 +1,111 @@
+#include <stdio.h>
+#include <stdlib.h>
+#if (0) //  png is not used
+#include <png.h>
+#endif
+#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
+ */
+#if (0) //  png is not used
+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);
+}
+#endif  //  png is not used
+#if (1) //  function name and arguments are changed.
+int zbar_main (void* image_buff, int width, int height)
+#else
+int main (int argc, char **argv)
+#endif
+{
+#if (1) //  arguments are changed
+    if((image_buff == NULL)||(width < 1)||(height < 1)) return(1);
+#else
+    if(argc < 2) return(1);
+#endif
+
+    /* 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 */
+#if (1) //  width, height, raw data are fixed
+    void *raw = image_buff;
+#else
+    int width = 0, height = 0;
+    void *raw = NULL;
+    get_data(argv[1], &width, &height, &raw);
+#endif
+
+    /* 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);
+    if ( symbol ) {
+        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);
+        }
+    }
+    else {
+        printf("No Code detected.\n");
+    }
+
+    /* clean up */
+    zbar_image_destroy(image);
+    zbar_image_scanner_destroy(scanner);
+
+    return(0);
+}
+