370 lines
9.6 KiB
C
370 lines
9.6 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bli
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* \brief Generic array manipulation API.
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*
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* \warning Some array operations here are inherently inefficient,
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* and only included for the cases where the performance is acceptable.
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* Use with care.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "MEM_guardedalloc.h"
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#include "BLI_alloca.h"
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#include "BLI_math_base.h"
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#include "BLI_sys_types.h"
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#include "BLI_utildefines.h"
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#include "BLI_array_utils.h"
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#include "BLI_strict_flags.h" /* Keep last. */
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void _bli_array_reverse(void *arr_v, uint arr_len, size_t arr_stride)
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{
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const uint arr_stride_uint = (uint)arr_stride;
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const uint arr_half_stride = (arr_len / 2) * arr_stride_uint;
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uint i, i_end;
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char *arr = arr_v;
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char *buf = BLI_array_alloca(buf, arr_stride);
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for (i = 0, i_end = (arr_len - 1) * arr_stride_uint; i < arr_half_stride;
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i += arr_stride_uint, i_end -= arr_stride_uint)
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{
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memcpy(buf, &arr[i], arr_stride);
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memcpy(&arr[i], &arr[i_end], arr_stride);
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memcpy(&arr[i_end], buf, arr_stride);
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}
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}
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void _bli_array_wrap(void *arr_v, uint arr_len, size_t arr_stride, int dir)
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{
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char *arr = arr_v;
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char *buf = BLI_array_alloca(buf, arr_stride);
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if (dir == -1) {
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memcpy(buf, arr, arr_stride);
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memmove(arr, arr + arr_stride, arr_stride * (arr_len - 1));
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memcpy(arr + (arr_stride * (arr_len - 1)), buf, arr_stride);
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}
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else if (dir == 1) {
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memcpy(buf, arr + (arr_stride * (arr_len - 1)), arr_stride);
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memmove(arr + arr_stride, arr, arr_stride * (arr_len - 1));
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memcpy(arr, buf, arr_stride);
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}
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else {
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BLI_assert_unreachable();
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}
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}
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void _bli_array_permute(
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void *arr, const uint arr_len, const size_t arr_stride, const uint *order, void *arr_temp)
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{
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const size_t len = arr_len * arr_stride;
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const uint arr_stride_uint = (uint)arr_stride;
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void *arr_orig;
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uint i;
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if (arr_temp == NULL) {
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arr_orig = MEM_mallocN(len, __func__);
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}
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else {
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arr_orig = arr_temp;
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}
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memcpy(arr_orig, arr, len);
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for (i = 0; i < arr_len; i++) {
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BLI_assert(order[i] < arr_len);
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memcpy(POINTER_OFFSET(arr, arr_stride_uint * i),
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POINTER_OFFSET(arr_orig, arr_stride_uint * order[i]),
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arr_stride);
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}
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if (arr_temp == NULL) {
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MEM_freeN(arr_orig);
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}
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}
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uint _bli_array_deduplicate_ordered(void *arr, uint arr_len, size_t arr_stride)
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{
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if (UNLIKELY(arr_len <= 1)) {
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return arr_len;
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}
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const uint arr_stride_uint = (uint)arr_stride;
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uint j = 0;
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for (uint i = 0; i < arr_len; i++) {
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if ((i == j) || (memcmp(POINTER_OFFSET(arr, arr_stride_uint * i),
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POINTER_OFFSET(arr, arr_stride_uint * j),
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arr_stride) == 0))
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{
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continue;
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}
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j += 1;
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memcpy(POINTER_OFFSET(arr, arr_stride_uint * j),
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POINTER_OFFSET(arr, arr_stride_uint * i),
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arr_stride);
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}
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return j + 1;
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}
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int _bli_array_findindex(const void *arr, uint arr_len, size_t arr_stride, const void *p)
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{
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const char *arr_step = (const char *)arr;
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for (uint i = 0; i < arr_len; i++, arr_step += arr_stride) {
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if (memcmp(arr_step, p, arr_stride) == 0) {
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return (int)i;
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}
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}
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return -1;
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}
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int _bli_array_rfindindex(const void *arr, uint arr_len, size_t arr_stride, const void *p)
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{
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const char *arr_step = (const char *)arr + (arr_stride * arr_len);
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for (uint i = arr_len; i-- != 0;) {
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arr_step -= arr_stride;
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if (memcmp(arr_step, p, arr_stride) == 0) {
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return (int)i;
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}
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}
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return -1;
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}
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void _bli_array_binary_and(
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void *arr, const void *arr_a, const void *arr_b, uint arr_len, size_t arr_stride)
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{
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char *dst = arr;
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const char *src_a = arr_a;
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const char *src_b = arr_b;
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size_t i = arr_stride * arr_len;
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while (i--) {
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*(dst++) = *(src_a++) & *(src_b++);
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}
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}
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void _bli_array_binary_or(
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void *arr, const void *arr_a, const void *arr_b, uint arr_len, size_t arr_stride)
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{
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char *dst = arr;
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const char *src_a = arr_a;
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const char *src_b = arr_b;
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size_t i = arr_stride * arr_len;
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while (i--) {
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*(dst++) = *(src_a++) | *(src_b++);
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}
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}
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bool _bli_array_iter_span(const void *arr,
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uint arr_len,
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size_t arr_stride,
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bool use_wrap,
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bool use_delimit_bounds,
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bool (*test_fn)(const void *arr_item, void *user_data),
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void *user_data,
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uint span_step[2],
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uint *r_span_len)
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{
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if (arr_len == 0) {
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return false;
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}
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if (use_wrap && (span_step[0] != arr_len) && (span_step[0] > span_step[1])) {
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return false;
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}
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const uint arr_stride_uint = (uint)arr_stride;
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const void *item_prev;
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bool test_prev;
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uint i_curr;
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if ((span_step[0] == arr_len) && (span_step[1] == arr_len)) {
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if (use_wrap) {
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item_prev = POINTER_OFFSET(arr, (arr_len - 1) * arr_stride_uint);
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i_curr = 0;
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test_prev = test_fn(item_prev, user_data);
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}
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else if (use_delimit_bounds == false) {
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item_prev = arr;
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i_curr = 1;
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test_prev = test_fn(item_prev, user_data);
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}
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else {
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item_prev = NULL;
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i_curr = 0;
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test_prev = false;
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}
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}
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else if ((i_curr = span_step[1] + 2) < arr_len) {
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item_prev = POINTER_OFFSET(arr, (span_step[1] + 1) * arr_stride_uint);
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test_prev = test_fn(item_prev, user_data);
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}
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else {
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return false;
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}
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BLI_assert(i_curr < arr_len);
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const void *item_curr = POINTER_OFFSET(arr, i_curr * arr_stride_uint);
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while (i_curr < arr_len) {
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bool test_curr = test_fn(item_curr, user_data);
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if ((test_prev == false) && (test_curr == true)) {
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uint span_len;
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uint i_step_prev = i_curr;
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if (use_wrap) {
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uint i_step = i_curr + 1;
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if (UNLIKELY(i_step == arr_len)) {
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i_step = 0;
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}
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while (test_fn(POINTER_OFFSET(arr, i_step * arr_stride_uint), user_data)) {
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i_step_prev = i_step;
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i_step++;
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if (UNLIKELY(i_step == arr_len)) {
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i_step = 0;
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}
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}
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if (i_step_prev < i_curr) {
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span_len = (i_step_prev + (arr_len - i_curr)) + 1;
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}
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else {
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span_len = (i_step_prev - i_curr) + 1;
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}
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}
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else {
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uint i_step = i_curr + 1;
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while ((i_step != arr_len) &&
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test_fn(POINTER_OFFSET(arr, i_step * arr_stride_uint), user_data))
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{
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i_step_prev = i_step;
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i_step++;
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}
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span_len = (i_step_prev - i_curr) + 1;
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if ((use_delimit_bounds == false) && (i_step_prev == arr_len - 1)) {
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return false;
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}
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}
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span_step[0] = i_curr;
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span_step[1] = i_step_prev;
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*r_span_len = span_len;
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return true;
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}
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test_prev = test_curr;
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item_prev = item_curr;
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item_curr = POINTER_OFFSET(item_curr, arr_stride_uint);
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i_curr++;
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}
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return false;
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}
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bool _bli_array_is_zeroed(const void *arr_v, uint arr_len, size_t arr_stride)
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{
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const char *arr_step = (const char *)arr_v;
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size_t i = arr_stride * arr_len;
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while (i--) {
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if (*(arr_step++)) {
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return false;
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}
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}
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return true;
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}
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bool _bli_array_iter_spiral_square(const void *arr_v,
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const int arr_shape[2],
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size_t elem_size,
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const int center[2],
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bool (*test_fn)(const void *arr_item, void *user_data),
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void *user_data)
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{
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BLI_assert(center[0] >= 0 && center[1] >= 0 && center[0] < arr_shape[0] &&
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center[1] < arr_shape[1]);
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const char *arr = arr_v;
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const int stride[2] = {arr_shape[0] * (int)elem_size, (int)elem_size};
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/* Test center first. */
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int ofs[2] = {center[0] * stride[1], center[1] * stride[0]};
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if (test_fn(arr + ofs[0] + ofs[1], user_data)) {
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return true;
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}
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/* #steps_in and #steps_out are the "diameters" of the inscribed and circumscribed squares in the
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* rectangle. Each step smaller than #steps_in does not need to check bounds. */
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int steps_in, steps_out;
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{
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int x_minus = center[0];
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int x_plus = arr_shape[0] - center[0] - 1;
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int y_minus = center[1];
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int y_plus = arr_shape[1] - center[1] - 1;
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steps_in = 2 * min_iiii(x_minus, x_plus, y_minus, y_plus);
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steps_out = 2 * max_iiii(x_minus, x_plus, y_minus, y_plus);
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}
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/* For check_bounds. */
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const int limits[2] = {(arr_shape[0] - 1) * stride[0], stride[0] - stride[1]};
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int steps = 0;
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while (steps < steps_out) {
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steps += 2;
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/* Move one step to the diagonal of the negative quadrant. */
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ofs[0] -= stride[0];
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ofs[1] -= stride[1];
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bool check_bounds = steps > steps_in;
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/* Sign: 0=negative 1=positive. */
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for (int sign = 2; sign--;) {
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/* Axis: 0=x; 1=y. */
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for (int axis = 2; axis--;) {
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int ofs_step = stride[axis];
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if (!sign) {
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ofs_step *= -1;
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}
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int ofs_iter = ofs[axis] + ofs_step;
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int ofs_dest = ofs[axis] + steps * ofs_step;
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int ofs_other = ofs[!axis];
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ofs[axis] = ofs_dest;
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if (check_bounds) {
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if (ofs_other < 0 || ofs_other > limits[!axis]) {
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/* Out of bounds. */
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continue;
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}
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CLAMP(ofs_iter, 0, limits[axis]);
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CLAMP(ofs_dest, 0, limits[axis]);
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}
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while (true) {
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if (test_fn(arr + ofs_other + ofs_iter, user_data)) {
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return true;
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}
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if (ofs_iter == ofs_dest) {
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break;
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}
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ofs_iter += ofs_step;
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}
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}
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}
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}
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return false;
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}
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