diff options
Diffstat (limited to 'lpg/libqr/code-layout.c')
| -rw-r--r-- | lpg/libqr/code-layout.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/lpg/libqr/code-layout.c b/lpg/libqr/code-layout.c index 54947d1..2a90124 100644 --- a/lpg/libqr/code-layout.c +++ b/lpg/libqr/code-layout.c @@ -21,6 +21,8 @@ void qr_layout_init_mask(struct qr_code * code) int x, y; int dim = qr_code_width(code); struct qr_bitmap * bmp = code->modules; + const int * am_pos = QR_ALIGNMENT_LOCATION[code->version - 1]; + int am_side; assert(bmp->mask); @@ -53,11 +55,32 @@ void qr_layout_init_mask(struct qr_code * code) continue; } - /* XXX: alignment pattern */ - row[off] |= bit; } } + + /* Alignment pattern */ + am_side = code->version > 1 ? (code->version / 7) + 2 : 0; + for (y = 0; y < am_side; ++y) { + for (x = 0; x < am_side; ++x) { + int i, j; + + if ((x == 0 && y == 0) || + (x == 0 && y == am_side - 1) || + (x == am_side - 1 && y == 0)) + continue; + + for (j = -2; j <= 2; ++j) { + unsigned char * row = bmp->mask + (am_pos[y]+j) * bmp->stride; + for (i = -2; i <= 2; ++i) { + unsigned char bit = 1 << ((am_pos[x]+i) % CHAR_BIT); + int off = (am_pos[x]+i) / CHAR_BIT; + + row[off] &= ~bit; + } + } + } + } } static int is_data_bit(const struct qr_iterator * i) |