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 #if defined(__cplusplus) || defined(c_plusplus) 17 extern "C" { 18 #endif 19 20 //------------------------------------------------------------------------------ 21 // WebPConfig 22 //------------------------------------------------------------------------------ 23 24 int WebPConfigInitInternal(WebPConfig* config, 25 WebPPreset preset, float quality, int version) { 26 if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_ENCODER_ABI_VERSION)) { 27 return 0; // caller/system version mismatch! 28 } 29 if (config == NULL) return 0; 30 31 config->quality = quality; 32 config->target_size = 0; 33 config->target_PSNR = 0.; 34 config->method = 4; 35 config->sns_strength = 50; 36 config->filter_strength = 60; // rather high filtering, helps w/ gradients. 37 config->filter_sharpness = 0; 38 config->filter_type = 1; // default: strong (so U/V is filtered too) 39 config->partitions = 0; 40 config->segments = 4; 41 config->pass = 1; 42 config->show_compressed = 0; 43 config->preprocessing = 0; 44 config->autofilter = 0; 45 config->partition_limit = 0; 46 config->alpha_compression = 1; 47 config->alpha_filtering = 1; 48 config->alpha_quality = 100; 49 config->lossless = 0; 50 config->image_hint = WEBP_HINT_DEFAULT; 51 config->emulate_jpeg_size = 0; 52 config->thread_level = 0; 53 config->low_memory = 0; 54 55 // TODO(skal): tune. 56 switch (preset) { 57 case WEBP_PRESET_PICTURE: 58 config->sns_strength = 80; 59 config->filter_sharpness = 4; 60 config->filter_strength = 35; 61 break; 62 case WEBP_PRESET_PHOTO: 63 config->sns_strength = 80; 64 config->filter_sharpness = 3; 65 config->filter_strength = 30; 66 break; 67 case WEBP_PRESET_DRAWING: 68 config->sns_strength = 25; 69 config->filter_sharpness = 6; 70 config->filter_strength = 10; 71 break; 72 case WEBP_PRESET_ICON: 73 config->sns_strength = 0; 74 config->filter_strength = 0; // disable filtering to retain sharpness 75 break; 76 case WEBP_PRESET_TEXT: 77 config->sns_strength = 0; 78 config->filter_strength = 0; // disable filtering to retain sharpness 79 config->segments = 2; 80 break; 81 case WEBP_PRESET_DEFAULT: 82 default: 83 break; 84 } 85 return WebPValidateConfig(config); 86 } 87 88 int 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 > 1) 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 defined(__cplusplus) || defined(c_plusplus) 142 } // extern "C" 143 #endif 144
