void ccv_resample(ccv_dense_matrix_t* a, ccv_dense_matrix_t** b, int btype, int rows, int cols, int type)
{
assert(rows > 0 && cols > 0);
ccv_declare_derived_signature(sig, a->sig != 0, ccv_sign_with_format(64, "ccv_resample(%d,%d,%d)", rows, cols, type), a->sig, CCV_EOF_SIGN);
btype = (btype == 0) ? CCV_GET_DATA_TYPE(a->type) | CCV_GET_CHANNEL(a->type) : CCV_GET_DATA_TYPE(btype) | CCV_GET_CHANNEL(a->type);
ccv_dense_matrix_t* db = *b = ccv_dense_matrix_renew(*b, rows, cols, CCV_ALL_DATA_TYPE | CCV_GET_CHANNEL(a->type), btype, sig);
ccv_object_return_if_cached(, db);
if (a->rows == db->rows && a->cols == db->cols)
{
if (CCV_GET_CHANNEL(a->type) == CCV_GET_CHANNEL(db->type) && CCV_GET_DATA_TYPE(db->type) == CCV_GET_DATA_TYPE(a->type))
memcpy(db->data.u8, a->data.u8, a->rows * a->step);
else {
ccv_shift(a, (ccv_matrix_t**)&db, 0, 0, 0);
}
return;
}
if ((type & CCV_INTER_AREA) && a->rows >= db->rows && a->cols >= db->cols)
{
/* using the fast alternative (fix point scale, 0x100 to avoid overflow) */
if (CCV_GET_DATA_TYPE(a->type) == CCV_8U && CCV_GET_DATA_TYPE(db->type) == CCV_8U && a->rows * a->cols / (db->rows * db->cols) < 0x100)
_ccv_resample_area_8u(a, db);
else
_ccv_resample_area(a, db);
} else if (type & CCV_INTER_CUBIC) {
if (CCV_GET_DATA_TYPE(db->type) == CCV_32F || CCV_GET_DATA_TYPE(db->type) == CCV_64F)
_ccv_resample_cubic_float_only(a, db);
else
_ccv_resample_cubic_integer_only(a, db);
} else if (type & CCV_INTER_LINEAR) {
assert(0 && "CCV_INTER_LINEAR is not implemented");
} else if (type & CCV_INTER_LINEAR) {
assert(0 && "CCV_INTER_LANCZOS is not implemented");
}
}
void ccv_resample(ccv_dense_matrix_t* a, ccv_dense_matrix_t** b, int btype, int rows, int cols, int type)
{
ccv_declare_matrix_signature(sig, a->sig != 0, ccv_sign_with_format(64, "ccv_resample(%d,%d,%d)", rows, cols, type), a->sig, 0);
btype = (btype == 0) ? CCV_GET_DATA_TYPE(a->type) | CCV_GET_CHANNEL(a->type) : CCV_GET_DATA_TYPE(btype) | CCV_GET_CHANNEL(a->type);
ccv_dense_matrix_t* db = *b = ccv_dense_matrix_renew(*b, rows, cols, CCV_ALL_DATA_TYPE | CCV_GET_CHANNEL(a->type), btype, sig);
ccv_matrix_return_if_cached(, db);
if (a->rows == db->rows && a->cols == db->cols)
{
if (CCV_GET_CHANNEL(a->type) == CCV_GET_CHANNEL(db->type) && CCV_GET_DATA_TYPE(db->type) == CCV_GET_DATA_TYPE(a->type))
memcpy(db->data.u8, a->data.u8, a->rows * a->step);
else {
ccv_shift(a, (ccv_matrix_t**)&db, 0, 0, 0);
}
return;
}
switch (type)
{
case CCV_INTER_AREA:
if (a->rows > db->rows && a->cols > db->cols)
{
/* using the fast alternative (fix point scale, 0x100 to avoid overflow) */
if (CCV_GET_DATA_TYPE(a->type) == CCV_8U && CCV_GET_DATA_TYPE(db->type) == CCV_8U && a->rows * a->cols / (db->rows * db->cols) < 0x100)
_ccv_resample_area_8u(a, db);
else
_ccv_resample_area(a, db);
break;
}
case CCV_INTER_LINEAR:
break;
case CCV_INTER_CUBIC:
break;
case CCV_INTER_LANCZOS:
break;
}
}