565 lines
21 KiB
C++
565 lines
21 KiB
C++
// basisu_pvrtc1_4.cpp
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// Copyright (C) 2019-2021 Binomial LLC. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "basisu_pvrtc1_4.h"
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namespace basisu
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{
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#if 0
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static const uint8_t g_pvrtc_5[32] = { 0,8,16,24,33,41,49,57,66,74,82,90,99,107,115,123,132,140,148,156,165,173,181,189,198,206,214,222,231,239,247,255 };
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static const uint8_t g_pvrtc_4[16] = { 0,16,33,49,66,82,99,115,140,156,173,189,206,222,239,255 };
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static const uint8_t g_pvrtc_3[8] = { 0,33,74,107,148,181,222,255 };
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static const uint8_t g_pvrtc_alpha[9] = { 0,34,68,102,136,170,204,238,255 };
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#endif
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static const uint8_t g_pvrtc_5_nearest[256] = { 0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,19,19,19,19,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,23,23,23,23,23,24,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31,31,31,31 };
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static const uint8_t g_pvrtc_4_nearest[256] = { 0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15 };
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#if 0
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static const uint8_t g_pvrtc_3_nearest[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 };
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static const uint8_t g_pvrtc_alpha_nearest[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8 };
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#endif
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#if 0
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static const uint8_t g_pvrtc_5_floor[256] =
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{
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0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,
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3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,
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7,7,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,
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11,11,11,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,
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15,15,15,15,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,
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19,19,19,19,19,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,
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23,23,23,23,23,23,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,
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27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31
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};
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static const uint8_t g_pvrtc_5_ceil[256] =
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{
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0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,
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4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,
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8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,12,12,12,12,12,
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12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,16,16,16,16,
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16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,19,19,19,19,20,20,20,
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20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,23,23,23,23,23,24,24,
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24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,27,27,27,27,27,27,28,
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28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31,31,31,31,31,31,31,31
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};
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static const uint8_t g_pvrtc_4_floor[256] =
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{
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
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3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,
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9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,
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11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,
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13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15
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};
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static const uint8_t g_pvrtc_4_ceil[256] =
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{
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0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
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4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,
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6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,
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8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,
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10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,
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12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15
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};
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static const uint8_t g_pvrtc_3_floor[256] =
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{
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
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3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,
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4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,
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5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7
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};
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static const uint8_t g_pvrtc_3_ceil[256] =
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{
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0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
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3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
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4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,
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5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
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};
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static const uint8_t g_pvrtc_alpha_floor[256] =
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{
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
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3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
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4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8
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};
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static const uint8_t g_pvrtc_alpha_ceil[256] =
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{
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0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
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3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
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4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
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};
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#endif
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uint32_t pvrtc4_swizzle_uv(uint32_t width, uint32_t height, uint32_t x, uint32_t y)
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{
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assert((x < width) && (y < height) && basisu::is_pow2(height) && basisu::is_pow2(width));
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uint32_t min_d = width, max_v = y;
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if (height < width)
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{
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min_d = height;
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max_v = x;
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}
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// Interleave the XY LSB's
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uint32_t shift_ofs = 0, swizzled = 0;
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for (uint32_t s_bit = 1, d_bit = 1; s_bit < min_d; s_bit <<= 1, d_bit <<= 2, ++shift_ofs)
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{
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if (y & s_bit) swizzled |= d_bit;
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if (x & s_bit) swizzled |= (2 * d_bit);
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}
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max_v >>= shift_ofs;
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// OR in the rest of the bits from the largest dimension
|
|
swizzled |= (max_v << (2 * shift_ofs));
|
|
|
|
return swizzled;
|
|
}
|
|
|
|
color_rgba pvrtc4_block::get_endpoint(uint32_t endpoint_index, bool unpack) const
|
|
{
|
|
assert(endpoint_index < 2);
|
|
const uint32_t packed = m_endpoints >> (endpoint_index * 16);
|
|
|
|
uint32_t r, g, b, a;
|
|
if (packed & 0x8000)
|
|
{
|
|
// opaque 554 or 555
|
|
if (!endpoint_index)
|
|
{
|
|
r = (packed >> 10) & 31;
|
|
g = (packed >> 5) & 31;
|
|
b = (packed >> 1) & 15;
|
|
|
|
if (unpack)
|
|
{
|
|
b = (b << 1) | (b >> 3);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
r = (packed >> 10) & 31;
|
|
g = (packed >> 5) & 31;
|
|
b = packed & 31;
|
|
}
|
|
|
|
a = unpack ? 255 : 7;
|
|
}
|
|
else
|
|
{
|
|
// translucent 4433 or 4443
|
|
if (!endpoint_index)
|
|
{
|
|
a = (packed >> 12) & 7;
|
|
r = (packed >> 8) & 15;
|
|
g = (packed >> 4) & 15;
|
|
b = (packed >> 1) & 7;
|
|
|
|
if (unpack)
|
|
{
|
|
a = (a << 1);
|
|
a = (a << 4) | a;
|
|
|
|
r = (r << 1) | (r >> 3);
|
|
g = (g << 1) | (g >> 3);
|
|
b = (b << 2) | (b >> 1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
a = (packed >> 12) & 7;
|
|
r = (packed >> 8) & 15;
|
|
g = (packed >> 4) & 15;
|
|
b = packed & 15;
|
|
|
|
if (unpack)
|
|
{
|
|
a = (a << 1);
|
|
a = (a << 4) | a;
|
|
|
|
r = (r << 1) | (r >> 3);
|
|
g = (g << 1) | (g >> 3);
|
|
b = (b << 1) | (b >> 3);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (unpack)
|
|
{
|
|
r = (r << 3) | (r >> 2);
|
|
g = (g << 3) | (g >> 2);
|
|
b = (b << 3) | (b >> 2);
|
|
}
|
|
|
|
assert((r < 256) && (g < 256) && (b < 256) && (a < 256));
|
|
|
|
return color_rgba(r, g, b, a);
|
|
}
|
|
|
|
color_rgba pvrtc4_block::get_endpoint_5554(uint32_t endpoint_index) const
|
|
{
|
|
assert(endpoint_index < 2);
|
|
const uint32_t packed = m_endpoints >> (endpoint_index * 16);
|
|
|
|
uint32_t r, g, b, a;
|
|
if (packed & 0x8000)
|
|
{
|
|
// opaque 554 or 555
|
|
if (!endpoint_index)
|
|
{
|
|
r = (packed >> 10) & 31;
|
|
g = (packed >> 5) & 31;
|
|
b = (packed >> 1) & 15;
|
|
|
|
b = (b << 1) | (b >> 3);
|
|
}
|
|
else
|
|
{
|
|
r = (packed >> 10) & 31;
|
|
g = (packed >> 5) & 31;
|
|
b = packed & 31;
|
|
}
|
|
|
|
a = 15;
|
|
}
|
|
else
|
|
{
|
|
// translucent 4433 or 4443
|
|
if (!endpoint_index)
|
|
{
|
|
a = (packed >> 12) & 7;
|
|
r = (packed >> 8) & 15;
|
|
g = (packed >> 4) & 15;
|
|
b = (packed >> 1) & 7;
|
|
|
|
a = a << 1;
|
|
|
|
r = (r << 1) | (r >> 3);
|
|
g = (g << 1) | (g >> 3);
|
|
b = (b << 2) | (b >> 1);
|
|
}
|
|
else
|
|
{
|
|
a = (packed >> 12) & 7;
|
|
r = (packed >> 8) & 15;
|
|
g = (packed >> 4) & 15;
|
|
b = packed & 15;
|
|
|
|
a = a << 1;
|
|
|
|
r = (r << 1) | (r >> 3);
|
|
g = (g << 1) | (g >> 3);
|
|
b = (b << 1) | (b >> 3);
|
|
}
|
|
}
|
|
|
|
assert((r < 32) && (g < 32) && (b < 32) && (a < 16));
|
|
|
|
return color_rgba(r, g, b, a);
|
|
}
|
|
|
|
bool pvrtc4_image::get_interpolated_colors(uint32_t x, uint32_t y, color_rgba* pColors) const
|
|
{
|
|
assert((x < m_width) && (y < m_height));
|
|
|
|
int block_x0 = (static_cast<int>(x) - 2) >> 2;
|
|
int block_x1 = block_x0 + 1;
|
|
int block_y0 = (static_cast<int>(y) - 2) >> 2;
|
|
int block_y1 = block_y0 + 1;
|
|
|
|
block_x0 = posmod(block_x0, m_block_width);
|
|
block_x1 = posmod(block_x1, m_block_width);
|
|
block_y0 = posmod(block_y0, m_block_height);
|
|
block_y1 = posmod(block_y1, m_block_height);
|
|
|
|
pColors[0] = interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0));
|
|
pColors[3] = interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1));
|
|
|
|
if (get_block_uses_transparent_modulation(x >> 2, y >> 2))
|
|
{
|
|
for (uint32_t c = 0; c < 4; c++)
|
|
{
|
|
uint32_t m = (pColors[0][c] + pColors[3][c]) / 2;
|
|
pColors[1][c] = static_cast<uint8_t>(m);
|
|
pColors[2][c] = static_cast<uint8_t>(m);
|
|
}
|
|
pColors[2][3] = 0;
|
|
return true;
|
|
}
|
|
|
|
for (uint32_t c = 0; c < 4; c++)
|
|
{
|
|
pColors[1][c] = static_cast<uint8_t>((pColors[0][c] * 5 + pColors[3][c] * 3) / 8);
|
|
pColors[2][c] = static_cast<uint8_t>((pColors[0][c] * 3 + pColors[3][c] * 5) / 8);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
color_rgba pvrtc4_image::get_pixel(uint32_t x, uint32_t y, uint32_t m) const
|
|
{
|
|
assert((x < m_width) && (y < m_height));
|
|
|
|
int block_x0 = (static_cast<int>(x) - 2) >> 2;
|
|
int block_x1 = block_x0 + 1;
|
|
int block_y0 = (static_cast<int>(y) - 2) >> 2;
|
|
int block_y1 = block_y0 + 1;
|
|
|
|
block_x0 = posmod(block_x0, m_block_width);
|
|
block_x1 = posmod(block_x1, m_block_width);
|
|
block_y0 = posmod(block_y0, m_block_height);
|
|
block_y1 = posmod(block_y1, m_block_height);
|
|
|
|
if (get_block_uses_transparent_modulation(x >> 2, y >> 2))
|
|
{
|
|
if (m == 0)
|
|
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0));
|
|
else if (m == 3)
|
|
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1));
|
|
|
|
color_rgba l(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0)));
|
|
color_rgba h(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1)));
|
|
|
|
return color_rgba((l[0] + h[0]) / 2, (l[1] + h[1]) / 2, (l[2] + h[2]) / 2, (m == 2) ? 0 : (l[3] + h[3]) / 2);
|
|
}
|
|
else
|
|
{
|
|
if (m == 0)
|
|
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0));
|
|
else if (m == 3)
|
|
return interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1));
|
|
|
|
color_rgba l(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(0), m_blocks(block_x1, block_y0).get_endpoint_5554(0), m_blocks(block_x0, block_y1).get_endpoint_5554(0), m_blocks(block_x1, block_y1).get_endpoint_5554(0)));
|
|
color_rgba h(interpolate(x, y, m_blocks(block_x0, block_y0).get_endpoint_5554(1), m_blocks(block_x1, block_y0).get_endpoint_5554(1), m_blocks(block_x0, block_y1).get_endpoint_5554(1), m_blocks(block_x1, block_y1).get_endpoint_5554(1)));
|
|
|
|
if (m == 2)
|
|
return color_rgba((l[0] * 3 + h[0] * 5) / 8, (l[1] * 3 + h[1] * 5) / 8, (l[2] * 3 + h[2] * 5) / 8, (l[3] * 3 + h[3] * 5) / 8);
|
|
else
|
|
return color_rgba((l[0] * 5 + h[0] * 3) / 8, (l[1] * 5 + h[1] * 3) / 8, (l[2] * 5 + h[2] * 3) / 8, (l[3] * 5 + h[3] * 3) / 8);
|
|
}
|
|
}
|
|
|
|
uint64_t pvrtc4_image::local_endpoint_optimization_opaque(uint32_t bx, uint32_t by, const image& orig_img, bool perceptual)
|
|
{
|
|
uint64_t initial_error = evaluate_1x1_endpoint_error(bx, by, orig_img, perceptual, false);
|
|
if (!initial_error)
|
|
return initial_error;
|
|
|
|
vec3F c_avg_orig(0);
|
|
|
|
for (int y = 0; y < 7; y++)
|
|
{
|
|
const uint32_t py = wrap_y(by * 4 + y - 1);
|
|
for (uint32_t x = 0; x < 7; x++)
|
|
{
|
|
const uint32_t px = wrap_x(bx * 4 + x - 1);
|
|
|
|
const color_rgba& c = orig_img(px, py);
|
|
|
|
c_avg_orig[0] += c[0];
|
|
c_avg_orig[1] += c[1];
|
|
c_avg_orig[2] += c[2];
|
|
}
|
|
}
|
|
|
|
c_avg_orig *= 1.0f / 49.0f;
|
|
|
|
vec3F quant_colors[2];
|
|
quant_colors[0].set(c_avg_orig);
|
|
quant_colors[0] -= vec3F(.0125f);
|
|
|
|
quant_colors[1].set(c_avg_orig);
|
|
quant_colors[1] += vec3F(.0125f);
|
|
|
|
float total_weight[2];
|
|
|
|
bool success = true;
|
|
|
|
for (uint32_t pass = 0; pass < 4; pass++)
|
|
{
|
|
vec3F new_colors[2] = { vec3F(0), vec3F(0) };
|
|
memset(total_weight, 0, sizeof(total_weight));
|
|
|
|
static const float s_weights[7][7] =
|
|
{
|
|
{ 1.000000f, 1.637089f, 2.080362f, 2.242640f, 2.080362f, 1.637089f, 1.000000f },
|
|
{ 1.637089f, 2.414213f, 3.006572f, 3.242640f, 3.006572f, 2.414213f, 1.637089f },
|
|
{ 2.080362f, 3.006572f, 3.828426f, 4.242640f, 3.828426f, 3.006572f, 2.080362f },
|
|
{ 2.242640f, 3.242640f, 4.242640f, 5.000000f, 4.242640f, 3.242640f, 2.242640f },
|
|
{ 2.080362f, 3.006572f, 3.828426f, 4.242640f, 3.828426f, 3.006572f, 2.080362f },
|
|
{ 1.637089f, 2.414213f, 3.006572f, 3.242640f, 3.006572f, 2.414213f, 1.637089f },
|
|
{ 1.000000f, 1.637089f, 2.080362f, 2.242640f, 2.080362f, 1.637089f, 1.000000f }
|
|
};
|
|
|
|
for (int y = 0; y < 7; y++)
|
|
{
|
|
const uint32_t py = wrap_y(by * 4 + y - 1);
|
|
for (uint32_t x = 0; x < 7; x++)
|
|
{
|
|
const uint32_t px = wrap_x(bx * 4 + x - 1);
|
|
|
|
const color_rgba& orig_c = orig_img(px, py);
|
|
|
|
vec3F color(orig_c[0], orig_c[1], orig_c[2]);
|
|
|
|
uint32_t c = quant_colors[0].squared_distance(color) > quant_colors[1].squared_distance(color);
|
|
|
|
const float weight = s_weights[y][x];
|
|
new_colors[c] += color * weight;
|
|
|
|
total_weight[c] += weight;
|
|
}
|
|
}
|
|
|
|
if (!total_weight[0] || !total_weight[1])
|
|
success = false;
|
|
|
|
quant_colors[0] = new_colors[0] / (float)total_weight[0];
|
|
quant_colors[1] = new_colors[1] / (float)total_weight[1];
|
|
}
|
|
|
|
if (!success)
|
|
{
|
|
quant_colors[0] = c_avg_orig;
|
|
quant_colors[1] = c_avg_orig;
|
|
}
|
|
|
|
vec4F colors[2] = { quant_colors[0], quant_colors[1] };
|
|
|
|
colors[0] += vec3F(.5f);
|
|
colors[1] += vec3F(.5f);
|
|
color_rgba color_0((int)colors[0][0], (int)colors[0][1], (int)colors[0][2], 0);
|
|
color_rgba color_1((int)colors[1][0], (int)colors[1][1], (int)colors[1][2], 0);
|
|
|
|
pvrtc4_block cur_blocks[3][3];
|
|
|
|
for (int y = -1; y <= 1; y++)
|
|
{
|
|
for (int x = -1; x <= 1; x++)
|
|
{
|
|
const uint32_t block_x = wrap_block_x(bx + x);
|
|
const uint32_t block_y = wrap_block_y(by + y);
|
|
cur_blocks[x + 1][y + 1] = m_blocks(block_x, block_y);
|
|
}
|
|
}
|
|
|
|
color_rgba l1(0), h1(0);
|
|
|
|
l1[0] = g_pvrtc_5_nearest[color_0[0]];
|
|
h1[0] = g_pvrtc_5_nearest[color_1[0]];
|
|
|
|
l1[1] = g_pvrtc_5_nearest[color_0[1]];
|
|
h1[1] = g_pvrtc_5_nearest[color_1[1]];
|
|
|
|
l1[2] = g_pvrtc_4_nearest[color_0[2]];
|
|
h1[2] = g_pvrtc_5_nearest[color_0[2]];
|
|
|
|
l1[3] = 0;
|
|
h1[3] = 0;
|
|
|
|
m_blocks(bx, by).set_endpoint_raw(0, l1, true);
|
|
m_blocks(bx, by).set_endpoint_raw(1, h1, true);
|
|
|
|
uint64_t e03_err_0 = remap_pixels_influenced_by_endpoint(bx, by, orig_img, perceptual, false);
|
|
|
|
pvrtc4_block blocks0[3][3];
|
|
for (int y = -1; y <= 1; y++)
|
|
{
|
|
for (int x = -1; x <= 1; x++)
|
|
{
|
|
const uint32_t block_x = wrap_block_x(bx + x);
|
|
const uint32_t block_y = wrap_block_y(by + y);
|
|
blocks0[x + 1][y + 1] = m_blocks(block_x, block_y);
|
|
}
|
|
}
|
|
|
|
l1[0] = g_pvrtc_5_nearest[color_1[0]];
|
|
h1[0] = g_pvrtc_5_nearest[color_0[0]];
|
|
|
|
l1[1] = g_pvrtc_5_nearest[color_1[1]];
|
|
h1[1] = g_pvrtc_5_nearest[color_0[1]];
|
|
|
|
l1[2] = g_pvrtc_4_nearest[color_1[2]];
|
|
h1[2] = g_pvrtc_5_nearest[color_0[2]];
|
|
|
|
l1[3] = 0;
|
|
h1[3] = 0;
|
|
|
|
m_blocks(bx, by).set_endpoint_raw(0, l1, true);
|
|
m_blocks(bx, by).set_endpoint_raw(1, h1, true);
|
|
|
|
uint64_t e03_err_1 = remap_pixels_influenced_by_endpoint(bx, by, orig_img, perceptual, false);
|
|
|
|
if (initial_error < basisu::minimum(e03_err_0, e03_err_1))
|
|
{
|
|
for (int y = -1; y <= 1; y++)
|
|
{
|
|
for (int x = -1; x <= 1; x++)
|
|
{
|
|
const uint32_t block_x = wrap_block_x(bx + x);
|
|
const uint32_t block_y = wrap_block_y(by + y);
|
|
m_blocks(block_x, block_y) = cur_blocks[x + 1][y + 1];
|
|
}
|
|
}
|
|
return initial_error;
|
|
}
|
|
else if (e03_err_0 < e03_err_1)
|
|
{
|
|
for (int y = -1; y <= 1; y++)
|
|
{
|
|
for (int x = -1; x <= 1; x++)
|
|
{
|
|
const uint32_t block_x = wrap_block_x(bx + x);
|
|
const uint32_t block_y = wrap_block_y(by + y);
|
|
m_blocks(block_x, block_y) = blocks0[x + 1][y + 1];
|
|
}
|
|
}
|
|
assert(e03_err_0 == evaluate_1x1_endpoint_error(bx, by, orig_img, perceptual, false));
|
|
return e03_err_0;
|
|
}
|
|
|
|
assert(e03_err_1 == evaluate_1x1_endpoint_error(bx, by, orig_img, perceptual, false));
|
|
return e03_err_1;
|
|
}
|
|
|
|
} // basisu
|