godot/thirdparty/astcenc/astcenc_quantization.cpp

// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
// Copyright 2011-2023 Arm Limited
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at:
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// ----------------------------------------------------------------------------

/**
 * @brief Functions and data tables for numeric quantization..
 */

#include "astcenc_internal.h"

#if !defined(ASTCENC_DECOMPRESS_ONLY)

// Not scrambled, starts from QUANT_6
const uint8_t color_unquant_to_uquant_tables[17][512] { … };

// Starts from QUANT_6
// Scrambled
const uint8_t color_uquant_to_scrambled_pquant_tables[17][256] { … };

#endif

// Starts from QUANT_6
// Scrambled
static const uint8_t color_scrambled_pquant_to_uquant_q6[6] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q8[8] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q10[10] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q12[12] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q16[16] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q20[20] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q24[24] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q32[32] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q40[40] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q48[48] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q64[64] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q80[80] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q96[96] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q128[128] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q160[160] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q192[192] { … };

static const uint8_t color_scrambled_pquant_to_uquant_q256[256] { … };

const uint8_t* color_scrambled_pquant_to_uquant_tables[17] { … };

// The quant_mode_table[integer_count/2][bits] gives us the quantization level for a given integer
// count and number of bits that the integer may fit into.
const int8_t quant_mode_table[10][128] { … };