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#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <qr/bitmap.h>
struct qr_bitmap * qr_bitmap_create(size_t width, size_t height, int masked)
{
struct qr_bitmap * out;
size_t size;
out = malloc(sizeof(*out));
if (!out)
goto fail;
out->width = width;
out->height = height;
out->stride = (width / CHAR_BIT) + (width % CHAR_BIT ? 1 : 0);
size = out->stride * height;
out->mask = 0;
out->bits = malloc(size);
if (!out->bits)
goto fail;
memset(out->bits, 0, size);
if (masked) {
out->mask = malloc(out->stride * width);
if (!out->mask)
goto fail;
memset(out->mask, 0xFF, size);
}
return out;
fail:
qr_bitmap_destroy(out);
return 0;
}
void qr_bitmap_destroy(struct qr_bitmap * bmp)
{
if (bmp) {
free(bmp->bits);
free(bmp->mask);
free(bmp);
}
}
int qr_bitmap_add_mask(struct qr_bitmap * bmp)
{
size_t size = bmp->stride * bmp->width;
bmp->mask = malloc(size);
if (!bmp->mask)
return -1;
memset(bmp->mask, 0xFF, size);
return 0;
}
struct qr_bitmap * qr_bitmap_clone(const struct qr_bitmap * src)
{
struct qr_bitmap * bmp;
size_t size;
bmp = qr_bitmap_create(src->width, src->height, !!src->mask);
if (!bmp)
return 0;
assert(bmp->stride == src->stride);
size = bmp->width * bmp->stride;
memcpy(bmp->bits, src->bits, size);
if (bmp->mask)
memcpy(bmp->mask, src->mask, size);
return bmp;
}
void qr_bitmap_merge(struct qr_bitmap * dest, const struct qr_bitmap * src)
{
unsigned char * d, * s, * m;
size_t n;
assert(dest->stride == src->stride);
assert(dest->height == src->height);
assert(src->mask);
n = dest->stride * dest->height;
d = dest->bits;
s = src->bits;
m = src->mask;
while (n--) {
*d &= ~*m;
*d++ |= *s++ & *m++;
}
}
/* CHAR_BIT | mod_bits (multi-byte) */
static void render_line_1(unsigned char * out,
const unsigned char * in,
size_t mod_bits,
size_t dim,
unsigned long mark,
unsigned long space)
{
unsigned char in_mask;
size_t n, b;
in_mask = 1;
n = dim;
while (n-- > 0) {
unsigned long v = (*in & in_mask) ? mark : space;
if ((in_mask <<= 1) == 0) {
in_mask = 1;
++in;
}
b = mod_bits / CHAR_BIT;
while (b-- > 0) {
*out++ = (unsigned char) v;
v >>= CHAR_BIT;
}
}
}
/* mod_bits | CHAR_BIT (packed) */
static void render_line_2(unsigned char * out,
const unsigned char * in,
size_t mod_bits,
size_t dim,
unsigned long mark,
unsigned long space)
{
unsigned char in_mask;
size_t n, b, step, shift;
in_mask = 1;
step = CHAR_BIT / mod_bits;
shift = CHAR_BIT - mod_bits;
n = dim;
while (n > 0) {
unsigned char tmp = 0;
b = step;
while (b-- > 0) {
unsigned long v = (*in & in_mask) ? mark : space;
if ((in_mask <<= 1) == 0) {
in_mask = 1;
++in;
}
tmp = (tmp >> mod_bits) | (v << shift);
if (--n == 0) {
tmp >>= b * mod_bits;
break;
}
};
*out++ = tmp;
}
}
void qr_bitmap_render(const struct qr_bitmap * bmp,
void * buffer,
int mod_bits,
size_t line_stride,
int line_repeat,
unsigned long mark,
unsigned long space)
{
unsigned char * out;
const unsigned char * in;
size_t n, dim;
int pack;
pack = (mod_bits < CHAR_BIT);
assert(!pack || (CHAR_BIT % mod_bits == 0));
assert( pack || (mod_bits % CHAR_BIT == 0));
in = bmp->bits;
out = buffer;
dim = bmp->width;
n = dim;
while (n-- > 0) {
size_t rpt;
unsigned char * next;
if (pack)
render_line_2(out, in, mod_bits, dim, mark, space);
else
render_line_1(out, in, mod_bits, dim, mark, space);
rpt = line_repeat;
next = out + line_stride;
while (rpt-- > 0) {
memcpy(next, out, line_stride);
next += line_stride;
}
in += bmp->stride;
out = next;
}
}
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