diff options
Diffstat (limited to 'lpg/libqr/code-common.c')
| -rw-r--r-- | lpg/libqr/code-common.c | 89 |
1 files changed, 45 insertions, 44 deletions
diff --git a/lpg/libqr/code-common.c b/lpg/libqr/code-common.c index 7c3c119..bc6621a 100644 --- a/lpg/libqr/code-common.c +++ b/lpg/libqr/code-common.c @@ -1,7 +1,10 @@ +#include <assert.h> +#include <limits.h> #include <stdlib.h> + #include <qr/code.h> #include <qr/bitmap.h> -#include "code-common.h" +#include <qr/bitstream.h> void qr_code_destroy(struct qr_code * code) { @@ -16,7 +19,7 @@ int qr_code_width(const struct qr_code * code) return code->version * 4 + 17; } -size_t code_total_capacity(int version) +size_t qr_code_total_capacity(int version) { int side = version * 4 + 17; @@ -38,46 +41,44 @@ size_t code_total_capacity(int version) return side * side - function_bits; } -const int QR_ALIGNMENT_LOCATION[40][7] = { - { 0, 0, 0, 0, 0, 0, 0 }, /* 1 */ - { 6, 18, 0, 0, 0, 0, 0 }, /* 2 */ - { 6, 22, 0, 0, 0, 0, 0 }, /* 3 */ - { 6, 26, 0, 0, 0, 0, 0 }, /* 4 */ - { 6, 30, 0, 0, 0, 0, 0 }, /* 5 */ - { 6, 34, 0, 0, 0, 0, 0 }, /* 6 */ - { 6, 22, 38, 0, 0, 0, 0 }, /* 7 */ - { 6, 24, 42, 0, 0, 0, 0 }, /* 8 */ - { 6, 26, 46, 0, 0, 0, 0 }, /* 9 */ - { 6, 28, 50, 0, 0, 0, 0 }, /* 10 */ - { 6, 30, 54, 0, 0, 0, 0 }, /* 11 */ - { 6, 32, 58, 0, 0, 0, 0 }, /* 12 */ - { 6, 34, 62, 0, 0, 0, 0 }, /* 13 */ - { 6, 26, 46, 66, 0, 0, 0 }, /* 14 */ - { 6, 26, 48, 70, 0, 0, 0 }, /* 15 */ - { 6, 26, 50, 74, 0, 0, 0 }, /* 16 */ - { 6, 30, 54, 78, 0, 0, 0 }, /* 17 */ - { 6, 30, 56, 82, 0, 0, 0 }, /* 18 */ - { 6, 30, 58, 86, 0, 0, 0 }, /* 19 */ - { 6, 34, 62, 90, 0, 0, 0 }, /* 20 */ - { 6, 28, 50, 72, 94, 0, 0 }, /* 21 */ - { 6, 26, 50, 74, 98, 0, 0 }, /* 22 */ - { 6, 30, 54, 78,102, 0, 0 }, /* 23 */ - { 6, 28, 54, 80,106, 0, 0 }, /* 24 */ - { 6, 32, 58, 84,110, 0, 0 }, /* 25 */ - { 6, 30, 58, 86,114, 0, 0 }, /* 26 */ - { 6, 34, 62, 90,118, 0, 0 }, /* 27 */ - { 6, 26, 50, 74, 98,122, 0 }, /* 28 */ - { 6, 30, 54, 78,102,126, 0 }, /* 29 */ - { 6, 26, 52, 78,104,130, 0 }, /* 30 */ - { 6, 30, 56, 82,108,134, 0 }, /* 31 */ - { 6, 34, 60, 86,112,138, 0 }, /* 32 */ - { 6, 30, 58, 86,114,142, 0 }, /* 33 */ - { 6, 34, 62, 90,118,146, 0 }, /* 34 */ - { 6, 30, 54, 78,102,126,150 }, /* 35 */ - { 6, 24, 50, 76,102,128,154 }, /* 36 */ - { 6, 28, 54, 80,106,132,158 }, /* 37 */ - { 6, 32, 58, 84,110,136,162 }, /* 38 */ - { 6, 26, 54, 82,110,138,166 }, /* 39 */ - { 6, 30, 58, 86,114,142,170 }, /* 40 */ -}; +struct qr_bitmap * qr_mask_apply(const struct qr_bitmap * orig, + unsigned int mask) +{ + struct qr_bitmap * bmp; + int i, j; + + if (mask & ~0x7) + return 0; + + bmp = qr_bitmap_clone(orig); + if (!bmp) + return 0; + + /* Slow version for now; we can optimize later */ + + for (i = 0; i < bmp->height; ++i) { + unsigned char * p = bmp->bits + i * bmp->stride; + + for (j = 0; j < bmp->width; ++j) { + int bit = j % CHAR_BIT; + size_t off = j / CHAR_BIT; + int t; + + switch (mask) { + case 0: t = (i + j) % 2; break; + case 1: t = i % 2; break; + case 2: t = j % 3; break; + case 3: t = (i + j) % 3; break; + case 4: t = (i/2 + j/3) % 2; break; + case 5: t = ((i*j) % 2) + ((i*j) % 3); break; + case 6: t = (((i*j) % 2) + ((i*j) % 3)) % 2; break; + case 7: t = (((i*j) % 3) + ((i+j) % 2)) % 2; break; + } + + p[off] ^= (t == 0) << bit; + } + } + + return bmp; +} |