64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
#include "qrcode-util.h"
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#include "terminal-util.h"
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#define ANSI_WHITE_ON_BLACK "\033[40;37;1m"
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static void print_border(FILE *output, unsigned width) {
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unsigned x, y;
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/* Four rows of border */
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for (y = 0; y < 4; y += 2) {
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (x = 0; x < 4 + width + 4; x++)
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fputs("\342\226\210", output);
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fputs(ANSI_NORMAL "\n", output);
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}
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}
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void write_qrcode(FILE *output, QRcode *qr) {
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unsigned x, y;
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assert(qr);
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if (!output)
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output = stdout;
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print_border(output, qr->width);
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for (y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1, *row2;
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row1 = qr->data + qr->width * y;
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row2 = row1 + qr->width;
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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for (x = 0; x < (unsigned) qr->width; x ++) {
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bool a, b;
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a = row1[x] & 1;
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b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
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if (a && b)
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fputc(' ', output);
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else if (a)
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fputs("\342\226\204", output);
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else if (b)
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fputs("\342\226\200", output);
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else
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fputs("\342\226\210", output);
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}
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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fputs(ANSI_NORMAL "\n", output);
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}
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print_border(output, qr->width);
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fflush(output);
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}
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