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/*
* This file is part of the HDRL
* Copyright (C) 2016 European Southern Observatory
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/*-----------------------------------------------------------------------------
Includes
-----------------------------------------------------------------------------*/
#include "hdrl_multiiter.h"
#include "hdrl_iter.h"
#include <cpl.h>
#include <assert.h>
/*-----------------------------------------------------------------------------
Static Prototypes
-----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/**
* @addtogroup hdrl_multiiter
* @{
*/
/*----------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------
Function codes
-----------------------------------------------------------------------------*/
#define MAX_ITERS 32
typedef struct {
const cpl_frameset * frames;
hdrl_iter * iters[MAX_ITERS];
intptr_t niters;
void * data[MAX_ITERS];
} hdrl_multiiter_state;
static cpl_size hdrl_multiiter_length(hdrl_iter * it);
static void hdrl_multiiter_delete(void * it);
static void * hdrl_multiiter_next(hdrl_iter * it);
/* ---------------------------------------------------------------------------*/
/**
* @brief iterate over multiple iterators
*
* @param niters number of iterators
* @param iters array of iterators
* @param flags flags of iterator
*
* Iterates over multiple iterators returning their results as an array of
* pointers of the same length as number of iterators.
* The length of all iterators must currently be equal unless
* the HDRL_ITER_ALLOW_EMPTY flag is set iterators. Then the iterator will
* return NULL for the exhausted iterator entries.
* The multiiter may have HDRL_ITER_OWNS_DATA set in which case it will delete
* the result values itself. To take ownership set the pointer in the multiiter
* result to NULL.
*/
/* ---------------------------------------------------------------------------*/
hdrl_iter *
hdrl_multiiter_new(intptr_t niters, hdrl_iter * iters[], hdrl_iter_flags flags)
{
cpl_ensure(niters > 0, CPL_ERROR_ILLEGAL_INPUT, NULL);
cpl_ensure(iters, CPL_ERROR_NULL_INPUT, NULL);
hdrl_multiiter_state * state = cpl_calloc(sizeof(*state), 1);
state->niters = niters;
cpl_size nlen = hdrl_iter_length(iters[0]);
for (intptr_t i = 0; i < niters; i++) {
state->iters[i] = iters[i];
/* TODO add broadcasting */
if (!(flags & HDRL_ITER_ALLOW_EMPTY) &&
hdrl_iter_length(iters[i]) != nlen) {
cpl_error_set_message(cpl_func, CPL_ERROR_ILLEGAL_INPUT,
"Iterator length must match");
}
}
return hdrl_iter_init(&hdrl_multiiter_next, NULL,
&hdrl_multiiter_length,
&hdrl_multiiter_delete,
HDRL_ITER_INPUT | HDRL_ITER_IMAGE | flags,
state);
}
static cpl_size hdrl_multiiter_length(hdrl_iter * it)
{
hdrl_multiiter_state * state = hdrl_iter_state(it);
return hdrl_iter_length(state->iters[0]);
}
static void hdrl_multiiter_delete(void * it)
{
if (!it)
return;
hdrl_multiiter_state * state = hdrl_iter_state(it);
for (intptr_t i = 0; i < state->niters; i++) {
hdrl_iter_delete(state->iters[i]);
}
cpl_free(state);
}
static void * hdrl_multiiter_next(hdrl_iter * it)
{
hdrl_multiiter_state * state = hdrl_iter_state(it);
int done = 0;
for (intptr_t i = 0; i < state->niters; i++) {
state->data[i] = hdrl_iter_next(state->iters[i]);
if (state->data[i] == NULL) {
done++;
}
assert(hdrl_iter_check(it, HDRL_ITER_ALLOW_EMPTY) ||
(done && !state->data[i]) || (!done && state->data[i]));
}
/* if empties are allowed we are done when all iterators are done */
if (hdrl_iter_check(it, HDRL_ITER_ALLOW_EMPTY)) {
return done == state->niters ? NULL : state->data;
}
else {
return done ? NULL : state->data;
}
}
/**@}*/
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