45 lines
967 B
C++
45 lines
967 B
C++
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/* SPDX-FileCopyrightText: 2025 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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*/
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#include "BLI_compression.hh"
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namespace blender {
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void filter_transpose_delta(const uint8_t *src, uint8_t *dst, size_t items_num, size_t item_size)
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{
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for (size_t ib = 0; ib < item_size; ib++) {
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uint8_t prev = 0;
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const uint8_t *src_ptr = src + ib;
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size_t it = 0;
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for (; it < items_num; it++) {
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uint8_t v = *src_ptr;
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*dst = v - prev;
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prev = v;
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src_ptr += item_size;
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dst += 1;
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}
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}
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}
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void unfilter_transpose_delta(const uint8_t *src, uint8_t *dst, size_t items_num, size_t item_size)
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{
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for (size_t ib = 0; ib < item_size; ib++) {
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uint8_t prev = 0;
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uint8_t *dst_ptr = dst + ib;
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for (size_t it = 0; it < items_num; it++) {
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uint8_t v = *src + prev;
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prev = v;
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*dst_ptr = v;
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src += 1;
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dst_ptr += item_size;
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}
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}
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}
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} // namespace blender
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