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lib: move some functions from vfs5011.c into img.c

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This commit is contained in:
Vasily Khoruzhick
2016-02-09 17:19:39 -08:00
parent 49a46668ad
commit 5e29695969
3 changed files with 40 additions and 35 deletions
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37
libfprint/drivers/vfs5011.c
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@@ -252,39 +252,6 @@ static void usb_exchange_async(struct fpi_ssm *ssm,
/* ====================== utils ======================= */
#if VFS5011_LINE_SIZE > INT_MAX/(256*256)
#error We might get integer overflow while computing standard deviation!
#endif
/* Calculade squared standand deviation */
static int get_deviation(unsigned char *buf, int size)
{
int res = 0, mean = 0, i;
for (i = 0; i < size; i++)
mean += buf[i];
mean /= size;
for (i = 0; i < size; i++) {
int dev = (int)buf[i] - mean;
res += dev*dev;
}
return res / size;
}
/* Calculate mean square difference of two lines */
static int get_diff_norm(unsigned char *buf1, unsigned char *buf2, int size)
{
int res = 0, i;
for (i = 0; i < size; i++) {
int dev = (int)buf1[i] - (int)buf2[i];
res += dev*dev;
}
return res / size;
}
/* Calculade squared standand deviation of sum of two lines */
static int vfs5011_get_deviation2(struct fpi_line_asmbl_ctx *ctx, GSList *row1, GSList *row2)
{
@@ -395,7 +362,7 @@ static int process_chunk(struct vfs5011_data *data, int transferred)
unsigned char *linebuf = data->capture_buffer
+ i * VFS5011_LINE_SIZE;
if (get_deviation(linebuf + 8, VFS5011_IMAGE_WIDTH)
if (fpi_std_sq_dev(linebuf + 8, VFS5011_IMAGE_WIDTH)
< DEVIATION_THRESHOLD) {
if (data->lines_captured == 0)
continue;
@@ -417,7 +384,7 @@ static int process_chunk(struct vfs5011_data *data, int transferred)
}
if ((data->lastline == NULL)
|| (get_diff_norm(
|| (fpi_mean_sq_diff_norm(
data->lastline + 8,
linebuf + 8,
VFS5011_IMAGE_WIDTH) >= DIFFERENCE_THRESHOLD)) {