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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(int width, int 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->bits, 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);
}
}
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++;
}
}
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