1 // Copyright 2011 Google Inc. All Rights Reserved. 2 // 3 // This code is licensed under the same terms as WebM: 4 // Software License Agreement: http://www.webmproject.org/license/software/ 5 // Additional IP Rights Grant: http://www.webmproject.org/license/additional/ 6 // ----------------------------------------------------------------------------- 7 // 8 // Coding tools configuration 9 // 10 // Author: Skal (pascal.massimino@gmail.com) 11 12 #include "webp/encode.h" 13 14 #if defined(__cplusplus) || defined(c_plusplus) 15 extern "C" { 16 #endif 17 18 //------------------------------------------------------------------------------ 19 // WebPConfig 20 //------------------------------------------------------------------------------ 21 WebPConfigInitInternal(WebPConfig * config,WebPPreset preset,float quality,int version)22int WebPConfigInitInternal(WebPConfig* config, 23 WebPPreset preset, float quality, int version) { 24 if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_ENCODER_ABI_VERSION)) { 25 return 0; // caller/system version mismatch! 26 } 27 if (config == NULL) return 0; 28 29 config->quality = quality; 30 config->target_size = 0; 31 config->target_PSNR = 0.; 32 config->method = 4; 33 config->sns_strength = 50; 34 config->filter_strength = 20; // default: light filtering 35 config->filter_sharpness = 0; 36 config->filter_type = 0; // default: simple 37 config->partitions = 0; 38 config->segments = 4; 39 config->pass = 1; 40 config->show_compressed = 0; 41 config->preprocessing = 0; 42 config->autofilter = 0; 43 config->partition_limit = 0; 44 config->alpha_compression = 1; 45 config->alpha_filtering = 1; 46 config->alpha_quality = 100; 47 config->lossless = 0; 48 config->image_hint = WEBP_HINT_DEFAULT; 49 50 // TODO(skal): tune. 51 switch (preset) { 52 case WEBP_PRESET_PICTURE: 53 config->sns_strength = 80; 54 config->filter_sharpness = 4; 55 config->filter_strength = 35; 56 break; 57 case WEBP_PRESET_PHOTO: 58 config->sns_strength = 80; 59 config->filter_sharpness = 3; 60 config->filter_strength = 30; 61 break; 62 case WEBP_PRESET_DRAWING: 63 config->sns_strength = 25; 64 config->filter_sharpness = 6; 65 config->filter_strength = 10; 66 break; 67 case WEBP_PRESET_ICON: 68 config->sns_strength = 0; 69 config->filter_strength = 0; // disable filtering to retain sharpness 70 break; 71 case WEBP_PRESET_TEXT: 72 config->sns_strength = 0; 73 config->filter_strength = 0; // disable filtering to retain sharpness 74 config->segments = 2; 75 break; 76 case WEBP_PRESET_DEFAULT: 77 default: 78 break; 79 } 80 return WebPValidateConfig(config); 81 } 82 WebPValidateConfig(const WebPConfig * config)83int WebPValidateConfig(const WebPConfig* config) { 84 if (config == NULL) return 0; 85 if (config->quality < 0 || config->quality > 100) 86 return 0; 87 if (config->target_size < 0) 88 return 0; 89 if (config->target_PSNR < 0) 90 return 0; 91 if (config->method < 0 || config->method > 6) 92 return 0; 93 if (config->segments < 1 || config->segments > 4) 94 return 0; 95 if (config->sns_strength < 0 || config->sns_strength > 100) 96 return 0; 97 if (config->filter_strength < 0 || config->filter_strength > 100) 98 return 0; 99 if (config->filter_sharpness < 0 || config->filter_sharpness > 7) 100 return 0; 101 if (config->filter_type < 0 || config->filter_type > 1) 102 return 0; 103 if (config->autofilter < 0 || config->autofilter > 1) 104 return 0; 105 if (config->pass < 1 || config->pass > 10) 106 return 0; 107 if (config->show_compressed < 0 || config->show_compressed > 1) 108 return 0; 109 if (config->preprocessing < 0 || config->preprocessing > 1) 110 return 0; 111 if (config->partitions < 0 || config->partitions > 3) 112 return 0; 113 if (config->partition_limit < 0 || config->partition_limit > 100) 114 return 0; 115 if (config->alpha_compression < 0) 116 return 0; 117 if (config->alpha_filtering < 0) 118 return 0; 119 if (config->alpha_quality < 0 || config->alpha_quality > 100) 120 return 0; 121 if (config->lossless < 0 || config->lossless > 1) 122 return 0; 123 if (config->image_hint >= WEBP_HINT_LAST) 124 return 0; 125 return 1; 126 } 127 128 //------------------------------------------------------------------------------ 129 130 #if defined(__cplusplus) || defined(c_plusplus) 131 } // extern "C" 132 #endif 133