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define a QUIRC_PIXEL_ALIAS_IMAGE constant to explicit conditional path

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Before this patch, the "sizeof dance" was confusing, fix #54.
This commit is contained in:
Alexandre Perrin 2019-07-01 21:19:39 +01:00
parent 5d71b1853e
commit f700e456b4
3 changed files with 6 additions and 4 deletions
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2
lib/identify.c
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@ -1071,7 +1071,7 @@ static void test_grouping(struct quirc *q, int i)
static void pixels_setup(struct quirc *q, uint8_t threshold)
{
if (sizeof(*q->image) == sizeof(*q->pixels)) {
if (QUIRC_PIXEL_ALIAS_IMAGE) {
q->pixels = (quirc_pixel_t *)q->image;
}

6
lib/quirc.c
View file

@ -39,7 +39,7 @@ void quirc_destroy(struct quirc *q)
free(q->image);
/* q->pixels may alias q->image when their type representation is of the
same size, so we need to be careful here to avoid a double free */
if (sizeof(*q->image) != sizeof(*q->pixels))
if (!QUIRC_PIXEL_ALIAS_IMAGE)
free(q->pixels);
free(q);
}
@ -80,7 +80,7 @@ int quirc_resize(struct quirc *q, int w, int h)
(void)memcpy(image, q->image, min);
/* alloc a new buffer for q->pixels if needed */
if (sizeof(*q->image) != sizeof(*q->pixels)) {
if (!QUIRC_PIXEL_ALIAS_IMAGE) {
pixels = calloc(newdim, sizeof(quirc_pixel_t));
if (!pixels)
goto fail;
@ -91,7 +91,7 @@ int quirc_resize(struct quirc *q, int w, int h)
q->h = h;
free(q->image);
q->image = image;
if (sizeof(*q->image) != sizeof(*q->pixels)) {
if (!QUIRC_PIXEL_ALIAS_IMAGE) {
free(q->pixels);
q->pixels = pixels;
}

2
lib/quirc_internal.h
View file

@ -32,8 +32,10 @@
#define QUIRC_PERSPECTIVE_PARAMS 8
#if QUIRC_MAX_REGIONS < UINT8_MAX
#define QUIRC_PIXEL_ALIAS_IMAGE 1
typedef uint8_t quirc_pixel_t;
#elif QUIRC_MAX_REGIONS < UINT16_MAX
#define QUIRC_PIXEL_ALIAS_IMAGE 0
typedef uint16_t quirc_pixel_t;
#else
#error "QUIRC_MAX_REGIONS > 65534 is not supported"