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| author | Leo Howell <leo@lwh.jp> | 2009-10-08 14:48:28 +0900 |
|---|---|---|
| committer | Leo Howell <leo@lwh.jp> | 2009-10-08 14:52:01 +0900 |
| commit | 6359bfddcc5868093418784fa2e972581ebd82b6 (patch) | |
| tree | 6175f5f428d45dcc86410b9578fd98dc3fc08700 /lpg | |
| parent | 62e8a6f2ad89be06c7e649c0fc4c564ecad2d070 (diff) | |
| download | pdf-simple-sign-6359bfddcc5868093418784fa2e972581ebd82b6.tar.gz pdf-simple-sign-6359bfddcc5868093418784fa2e972581ebd82b6.tar.xz pdf-simple-sign-6359bfddcc5868093418784fa2e972581ebd82b6.zip | |
render version bits
Diffstat (limited to 'lpg')
| -rw-r--r-- | lpg/libqr/code-create.c | 29 | ||||
| -rw-r--r-- | lpg/libqr/code-layout.c | 9 |
2 files changed, 36 insertions, 2 deletions
diff --git a/lpg/libqr/code-create.c b/lpg/libqr/code-create.c index 6c56f45..9936981 100644 --- a/lpg/libqr/code-create.c +++ b/lpg/libqr/code-create.c @@ -24,6 +24,7 @@ static int draw_format(struct qr_bitmap * bmp, enum qr_ec_level ec, int mask); static int calc_format_bits(enum qr_ec_level ec, int mask); +static long calc_version_bits(int version); static unsigned long gal_residue(unsigned long a, unsigned long m); /* FIXME: the static functions should be in a better @@ -508,7 +509,18 @@ static int draw_format(struct qr_bitmap * bmp, bits >>= 1; } - /* XXX: size info for 7~40 */ + if (code->version >= 7) { + bits = calc_version_bits(code->version); + + for (i = 0; i < 18; ++i) { + if (bits & 0x1) { + int a = i % 3, b = i / 3; + setpx(bmp, dim - 11 + a, b); + setpx(bmp, b, dim - 11 + a); + } + bits >>= 1; + } + } return 0; } @@ -532,6 +544,21 @@ static int calc_format_bits(enum qr_ec_level ec, int mask) return bits; } +static long calc_version_bits(int version) +{ + long bits; + + bits = version & 0x3F; + + /* (18, 6) BCH code + * G(x) = x^12 + x^11 + x^10 + x^9 + x^8 + x^5 + x^2 + 1 + */ + bits <<= 18 - 6; + bits |= gal_residue(bits, 0x1F25); + + return bits; +} + /* Calculate the residue of a modulo m */ static unsigned long gal_residue(unsigned long a, unsigned long m) diff --git a/lpg/libqr/code-layout.c b/lpg/libqr/code-layout.c index 4be3871..ed01112 100644 --- a/lpg/libqr/code-layout.c +++ b/lpg/libqr/code-layout.c @@ -45,7 +45,14 @@ void qr_layout_init_mask(struct qr_code * code) if (x < 9 && y >= dim - 8) /* bottom-left */ continue; - /* XXX: format data */ + /* version info */ + if (code->version >= 7) { + if (y < 6 && x >= dim - 11) + continue; + if (x < 6 && y >= dim - 11) + continue; + } + /* XXX: alignment pattern */ row[off] |= bit; |