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 (at) gmail.com) 13 14 #include "../webp/encode.h" 15 16 //------------------------------------------------------------------------------ 17 // WebPConfig 18 //------------------------------------------------------------------------------ 19 20 int 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->exact = 0; 47 config->image_hint = WEBP_HINT_DEFAULT; 48 config->emulate_jpeg_size = 0; 49 config->thread_level = 0; 50 config->low_memory = 0; 51 config->near_lossless = 100; 52 #ifdef WEBP_EXPERIMENTAL_FEATURES 53 config->delta_palettization = 0; 54 #endif // WEBP_EXPERIMENTAL_FEATURES 55 56 // TODO(skal): tune. 57 switch (preset) { 58 case WEBP_PRESET_PICTURE: 59 config->sns_strength = 80; 60 config->filter_sharpness = 4; 61 config->filter_strength = 35; 62 config->preprocessing &= ~2; // no dithering 63 break; 64 case WEBP_PRESET_PHOTO: 65 config->sns_strength = 80; 66 config->filter_sharpness = 3; 67 config->filter_strength = 30; 68 config->preprocessing |= 2; 69 break; 70 case WEBP_PRESET_DRAWING: 71 config->sns_strength = 25; 72 config->filter_sharpness = 6; 73 config->filter_strength = 10; 74 break; 75 case WEBP_PRESET_ICON: 76 config->sns_strength = 0; 77 config->filter_strength = 0; // disable filtering to retain sharpness 78 config->preprocessing &= ~2; // no dithering 79 break; 80 case WEBP_PRESET_TEXT: 81 config->sns_strength = 0; 82 config->filter_strength = 0; // disable filtering to retain sharpness 83 config->preprocessing &= ~2; // no dithering 84 config->segments = 2; 85 break; 86 case WEBP_PRESET_DEFAULT: 87 default: 88 break; 89 } 90 return WebPValidateConfig(config); 91 } 92 93 int WebPValidateConfig(const WebPConfig* config) { 94 if (config == NULL) return 0; 95 if (config->quality < 0 || config->quality > 100) 96 return 0; 97 if (config->target_size < 0) 98 return 0; 99 if (config->target_PSNR < 0) 100 return 0; 101 if (config->method < 0 || config->method > 6) 102 return 0; 103 if (config->segments < 1 || config->segments > 4) 104 return 0; 105 if (config->sns_strength < 0 || config->sns_strength > 100) 106 return 0; 107 if (config->filter_strength < 0 || config->filter_strength > 100) 108 return 0; 109 if (config->filter_sharpness < 0 || config->filter_sharpness > 7) 110 return 0; 111 if (config->filter_type < 0 || config->filter_type > 1) 112 return 0; 113 if (config->autofilter < 0 || config->autofilter > 1) 114 return 0; 115 if (config->pass < 1 || config->pass > 10) 116 return 0; 117 if (config->show_compressed < 0 || config->show_compressed > 1) 118 return 0; 119 if (config->preprocessing < 0 || config->preprocessing > 7) 120 return 0; 121 if (config->partitions < 0 || config->partitions > 3) 122 return 0; 123 if (config->partition_limit < 0 || config->partition_limit > 100) 124 return 0; 125 if (config->alpha_compression < 0) 126 return 0; 127 if (config->alpha_filtering < 0) 128 return 0; 129 if (config->alpha_quality < 0 || config->alpha_quality > 100) 130 return 0; 131 if (config->lossless < 0 || config->lossless > 1) 132 return 0; 133 if (config->near_lossless < 0 || config->near_lossless > 100) 134 return 0; 135 if (config->image_hint >= WEBP_HINT_LAST) 136 return 0; 137 if (config->emulate_jpeg_size < 0 || config->emulate_jpeg_size > 1) 138 return 0; 139 if (config->thread_level < 0 || config->thread_level > 1) 140 return 0; 141 if (config->low_memory < 0 || config->low_memory > 1) 142 return 0; 143 if (config->exact < 0 || config->exact > 1) 144 return 0; 145 #ifdef WEBP_EXPERIMENTAL_FEATURES 146 if (config->delta_palettization < 0 || config->delta_palettization > 1) 147 return 0; 148 #endif // WEBP_EXPERIMENTAL_FEATURES 149 return 1; 150 } 151 152 //------------------------------------------------------------------------------ 153 154 #define MAX_LEVEL 9 155 156 // Mapping between -z level and -m / -q parameter settings. 157 static const struct { 158 uint8_t method_; 159 uint8_t quality_; 160 } kLosslessPresets[MAX_LEVEL + 1] = { 161 { 0, 0 }, { 1, 20 }, { 2, 25 }, { 3, 30 }, { 3, 50 }, 162 { 4, 50 }, { 4, 75 }, { 4, 90 }, { 5, 90 }, { 6, 100 } 163 }; 164 165 int WebPConfigLosslessPreset(WebPConfig* config, int level) { 166 if (config == NULL || level < 0 || level > MAX_LEVEL) return 0; 167 config->lossless = 1; 168 config->method = kLosslessPresets[level].method_; 169 config->quality = kLosslessPresets[level].quality_; 170 return 1; 171 } 172 173 //------------------------------------------------------------------------------ 174
