git.sur5r.net Git - glabels/blob - glabels2/qrencode-3.1.0/tests/create_frame_pattern.c

   1 /*
   2  * This tool creates a frame pattern data for debug purpose used by
   3  * test_qrspec. test_qrspec and create_frame_pattern uses the same function
   4  * of libqrencode. This means the test is meaningless if test_qrspec is run
   5  * with a pattern data created by create_frame_pattern of the same version.
   6  * In order to test it correctly, create a pattern data by the tool of the
   7  * previous version, or use the frame data attached to the package.
   8  */
   9
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <png.h>
  13 #include "common.h"
  14 #include "../qrspec.h"
  15
  16 void append_pattern(int version, FILE *fp)
  17 {
  18         int width;
  19         unsigned char *frame;
  20
  21         frame = QRspec_newFrame(version);
  22         width = QRspec_getWidth(version);
  23         fwrite(frame, 1, width * width, fp);
  24         free(frame);
  25 }
  26
  27 static int writePNG(unsigned char *frame, int width, const char *outfile)
  28 {
  29         static FILE *fp;
  30         png_structp png_ptr;
  31         png_infop info_ptr;
  32         unsigned char *row, *p, *q;
  33         int x, y, xx, yy, bit;
  34         int realwidth;
  35         const int margin = 0;
  36         const int size = 1;
  37
  38         realwidth = (width + margin * 2) * size;
  39         row = (unsigned char *)malloc((realwidth + 7) / 8);
  40         if(row == NULL) {
  41                 fprintf(stderr, "Failed to allocate memory.\n");
  42                 exit(EXIT_FAILURE);
  43         }
  44
  45         if(outfile[0] == '-' && outfile[1] == '\0') {
  46                 fp = stdout;
  47         } else {
  48                 fp = fopen(outfile, "wb");
  49                 if(fp == NULL) {
  50                         fprintf(stderr, "Failed to create file: %s\n", outfile);
  51                         perror(NULL);
  52                         exit(EXIT_FAILURE);
  53                 }
  54         }
  55
  56         png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  57         if(png_ptr == NULL) {
  58                 fclose(fp);
  59                 fprintf(stderr, "Failed to initialize PNG writer.\n");
  60                 exit(EXIT_FAILURE);
  61         }
  62
  63         info_ptr = png_create_info_struct(png_ptr);
  64         if(info_ptr == NULL) {
  65                 fclose(fp);
  66                 fprintf(stderr, "Failed to initialize PNG write.\n");
  67                 exit(EXIT_FAILURE);
  68         }
  69
  70         if(setjmp(png_jmpbuf(png_ptr))) {
  71                 png_destroy_write_struct(&png_ptr, &info_ptr);
  72                 fclose(fp);
  73                 fprintf(stderr, "Failed to write PNG image.\n");
  74                 exit(EXIT_FAILURE);
  75         }
  76
  77         png_init_io(png_ptr, fp);
  78         png_set_IHDR(png_ptr, info_ptr,
  79                         realwidth, realwidth,
  80                         1,
  81                         PNG_COLOR_TYPE_GRAY,
  82                         PNG_INTERLACE_NONE,
  83                         PNG_COMPRESSION_TYPE_DEFAULT,
  84                         PNG_FILTER_TYPE_DEFAULT);
  85         png_write_info(png_ptr, info_ptr);
  86
  87         /* top margin */
  88         memset(row, 0xff, (realwidth + 7) / 8);
  89         for(y=0; y<margin * size; y++) {
  90                 png_write_row(png_ptr, row);
  91         }
  92
  93         /* data */
  94         p = frame;
  95         for(y=0; y<width; y++) {
  96                 bit = 7;
  97                 memset(row, 0xff, (realwidth + 7) / 8);
  98                 q = row;
  99                 q += margin * size / 8;
 100                 bit = 7 - (margin * size % 8);
 101                 for(x=0; x<width; x++) {
 102                         for(xx=0; xx<size; xx++) {
 103                                 *q ^= (*p & 1) << bit;
 104                                 bit--;
 105                                 if(bit < 0) {
 106                                         q++;
 107                                         bit = 7;
 108                                 }
 109                         }
 110                         p++;
 111                 }
 112                 for(yy=0; yy<size; yy++) {
 113                         png_write_row(png_ptr, row);
 114                 }
 115         }
 116         /* bottom margin */
 117         memset(row, 0xff, (realwidth + 7) / 8);
 118         for(y=0; y<margin * size; y++) {
 119                 png_write_row(png_ptr, row);
 120         }
 121
 122         png_write_end(png_ptr, info_ptr);
 123         png_destroy_write_struct(&png_ptr, &info_ptr);
 124
 125         fclose(fp);
 126         free(row);
 127
 128         return 0;
 129 }
 130
 131 void write_pattern_image(int version, const char *filename)
 132 {
 133         int width;
 134         unsigned char *frame;
 135         static char str[256];
 136
 137         frame = QRspec_newFrame(version);
 138         width = QRspec_getWidth(version);
 139
 140         snprintf(str, 256, "%s-%d.png", filename, version);
 141         writePNG(frame, width, str);
 142         free(frame);
 143 }
 144
 145 void write_pattern(const char *filename)
 146 {
 147         FILE *fp;
 148         int i;
 149
 150         fp = fopen(filename, "wb");
 151         if(fp == NULL) {
 152                 perror("Failed to open a file to write:");
 153                 abort();
 154         }
 155         for(i=1; i<=QRSPEC_VERSION_MAX; i++) {
 156                 append_pattern(i, fp);
 157                 write_pattern_image(i, filename);
 158         }
 159         fclose(fp);
 160 }
 161
 162 int main(int argc, char **argv)
 163 {
 164         if(argc < 2) {
 165                 printf("Create empty frame patterns.\nUsage: %s FILENAME\n", argv[0]);
 166                 exit(0);
 167         }
 168         write_pattern(argv[1]);
 169         return 0;
 170 }