1// Copyright 2011 Google Inc. All Rights Reserved. 2// 3// Use of this source code is governed by a BSD-style license 4// that can be found in the COPYING file in the root of the source 5// tree. An additional intellectual property rights grant can be found 6// in the file PATENTS. All contributing project authors may 7// be found in the AUTHORS file in the root of the source tree. 8// ----------------------------------------------------------------------------- 9// 10// Coding tools configuration 11// 12// Author: Skal (pascal.massimino@gmail.com) 13 14#include "../webp/encode.h" 15 16//------------------------------------------------------------------------------ 17// WebPConfig 18//------------------------------------------------------------------------------ 19 20int WebPConfigInitInternal(WebPConfig* config, 21 WebPPreset preset, float quality, int version) { 22 if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_ENCODER_ABI_VERSION)) { 23 return 0; // caller/system version mismatch! 24 } 25 if (config == NULL) return 0; 26 27 config->quality = quality; 28 config->target_size = 0; 29 config->target_PSNR = 0.; 30 config->method = 4; 31 config->sns_strength = 50; 32 config->filter_strength = 60; // mid-filtering 33 config->filter_sharpness = 0; 34 config->filter_type = 1; // default: strong (so U/V is filtered too) 35 config->partitions = 0; 36 config->segments = 4; 37 config->pass = 1; 38 config->show_compressed = 0; 39 config->preprocessing = 0; 40 config->autofilter = 0; 41 config->partition_limit = 0; 42 config->alpha_compression = 1; 43 config->alpha_filtering = 1; 44 config->alpha_quality = 100; 45 config->lossless = 0; 46 config->image_hint = WEBP_HINT_DEFAULT; 47 config->emulate_jpeg_size = 0; 48 config->thread_level = 0; 49 config->low_memory = 0; 50 51 // TODO(skal): tune. 52 switch (preset) { 53 case WEBP_PRESET_PICTURE: 54 config->sns_strength = 80; 55 config->filter_sharpness = 4; 56 config->filter_strength = 35; 57 config->preprocessing &= ~2; // no dithering 58 break; 59 case WEBP_PRESET_PHOTO: 60 config->sns_strength = 80; 61 config->filter_sharpness = 3; 62 config->filter_strength = 30; 63 config->preprocessing |= 2; 64 break; 65 case WEBP_PRESET_DRAWING: 66 config->sns_strength = 25; 67 config->filter_sharpness = 6; 68 config->filter_strength = 10; 69 break; 70 case WEBP_PRESET_ICON: 71 config->sns_strength = 0; 72 config->filter_strength = 0; // disable filtering to retain sharpness 73 config->preprocessing &= ~2; // no dithering 74 break; 75 case WEBP_PRESET_TEXT: 76 config->sns_strength = 0; 77 config->filter_strength = 0; // disable filtering to retain sharpness 78 config->preprocessing &= ~2; // no dithering 79 config->segments = 2; 80 break; 81 case WEBP_PRESET_DEFAULT: 82 default: 83 break; 84 } 85 return WebPValidateConfig(config); 86} 87 88int WebPValidateConfig(const WebPConfig* config) { 89 if (config == NULL) return 0; 90 if (config->quality < 0 || config->quality > 100) 91 return 0; 92 if (config->target_size < 0) 93 return 0; 94 if (config->target_PSNR < 0) 95 return 0; 96 if (config->method < 0 || config->method > 6) 97 return 0; 98 if (config->segments < 1 || config->segments > 4) 99 return 0; 100 if (config->sns_strength < 0 || config->sns_strength > 100) 101 return 0; 102 if (config->filter_strength < 0 || config->filter_strength > 100) 103 return 0; 104 if (config->filter_sharpness < 0 || config->filter_sharpness > 7) 105 return 0; 106 if (config->filter_type < 0 || config->filter_type > 1) 107 return 0; 108 if (config->autofilter < 0 || config->autofilter > 1) 109 return 0; 110 if (config->pass < 1 || config->pass > 10) 111 return 0; 112 if (config->show_compressed < 0 || config->show_compressed > 1) 113 return 0; 114 if (config->preprocessing < 0 || config->preprocessing > 3) 115 return 0; 116 if (config->partitions < 0 || config->partitions > 3) 117 return 0; 118 if (config->partition_limit < 0 || config->partition_limit > 100) 119 return 0; 120 if (config->alpha_compression < 0) 121 return 0; 122 if (config->alpha_filtering < 0) 123 return 0; 124 if (config->alpha_quality < 0 || config->alpha_quality > 100) 125 return 0; 126 if (config->lossless < 0 || config->lossless > 1) 127 return 0; 128 if (config->image_hint >= WEBP_HINT_LAST) 129 return 0; 130 if (config->emulate_jpeg_size < 0 || config->emulate_jpeg_size > 1) 131 return 0; 132 if (config->thread_level < 0 || config->thread_level > 1) 133 return 0; 134 if (config->low_memory < 0 || config->low_memory > 1) 135 return 0; 136 return 1; 137} 138 139//------------------------------------------------------------------------------ 140 141#if WEBP_ENCODER_ABI_VERSION > 0x0202 142#define MAX_LEVEL 9 143 144// Mapping between -z level and -m / -q parameter settings. 145static const struct { 146 uint8_t method_; 147 uint8_t quality_; 148} kLosslessPresets[MAX_LEVEL + 1] = { 149 { 0, 0 }, { 1, 20 }, { 2, 25 }, { 3, 30 }, { 3, 50 }, 150 { 4, 50 }, { 4, 75 }, { 4, 90 }, { 5, 90 }, { 6, 100 } 151}; 152 153int WebPConfigLosslessPreset(WebPConfig* config, int level) { 154 if (config == NULL || level < 0 || level > MAX_LEVEL) return 0; 155 config->lossless = 1; 156 config->method = kLosslessPresets[level].method_; 157 config->quality = kLosslessPresets[level].quality_; 158 return 1; 159} 160#endif 161 162//------------------------------------------------------------------------------ 163