Support horizontally flipped QR-codes according to ISO 18004:2015
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2 changed files with 19 additions and 0 deletions
16
lib/decode.c
16
lib/decode.c
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@ -916,3 +916,19 @@ quirc_decode_error_t quirc_decode(const struct quirc_code *code,
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return QUIRC_SUCCESS;
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}
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void quirc_flip(struct quirc_code *code)
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{
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struct quirc_code flipped;
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memset(&flipped, 0, sizeof(flipped));
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int offset = 0;
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for (int y = 0, sx = 0; y < code->size; y++, sx++) {
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for (int x = 0, sy = 0; x < code->size; x++, sy++) {
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if (grid_bit(code, sx, sy)) {
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flipped.cell_bitmap[offset >> 3] |= (1 << (offset & 7));
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}
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offset++;
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}
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}
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memcpy(&code->cell_bitmap, &flipped.cell_bitmap, sizeof(flipped.cell_bitmap));
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}
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@ -168,6 +168,9 @@ void quirc_extract(const struct quirc *q, int index,
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quirc_decode_error_t quirc_decode(const struct quirc_code *code,
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struct quirc_data *data);
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/* Flip a QR-code according to optional mirror feature of ISO 18004:2015 */
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void quirc_flip(struct quirc_code *code);
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#ifdef __cplusplus
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}
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#endif
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