1 // Copyright 2011 Google Inc. 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 <assert.h> 13 #include "webp/encode.h" 14 15 #if defined(__cplusplus) || defined(c_plusplus) 16 extern "C" { 17 #endif 18 19 //----------------------------------------------------------------------------- 20 // WebPConfig 21 //----------------------------------------------------------------------------- 22 WebPConfigInitInternal(WebPConfig * const config,WebPPreset preset,float quality,int version)23int WebPConfigInitInternal(WebPConfig* const config, 24 WebPPreset preset, float quality, int version) { 25 if (version != WEBP_ENCODER_ABI_VERSION) { 26 return 0; // caller/system version mismatch! 27 } 28 if (config == NULL) return 0; 29 30 config->quality = quality; 31 config->target_size = 0; 32 config->target_PSNR = 0.; 33 config->method = 4; 34 config->sns_strength = 50; 35 config->filter_strength = 20; // default: light filtering 36 config->filter_sharpness = 0; 37 config->filter_type = 0; // default: simple 38 config->partitions = 0; 39 config->segments = 4; 40 config->pass = 1; 41 config->show_compressed = 0; 42 config->preprocessing = 0; 43 config->autofilter = 0; 44 config->alpha_compression = 0; 45 46 // TODO(skal): tune. 47 switch (preset) { 48 case WEBP_PRESET_PICTURE: 49 config->sns_strength = 80; 50 config->filter_sharpness = 4; 51 config->filter_strength = 35; 52 break; 53 case WEBP_PRESET_PHOTO: 54 config->sns_strength = 80; 55 config->filter_sharpness = 3; 56 config->filter_strength = 30; 57 break; 58 case WEBP_PRESET_DRAWING: 59 config->sns_strength = 25; 60 config->filter_sharpness = 6; 61 config->filter_strength = 10; 62 break; 63 case WEBP_PRESET_ICON: 64 config->sns_strength = 0; 65 config->filter_strength = 0; // disable filtering to retain sharpness 66 break; 67 case WEBP_PRESET_TEXT: 68 config->sns_strength = 0; 69 config->filter_strength = 0; // disable filtering to retain sharpness 70 config->segments = 2; 71 break; 72 case WEBP_PRESET_DEFAULT: 73 default: 74 break; 75 } 76 return WebPValidateConfig(config); 77 } 78 WebPValidateConfig(const WebPConfig * const config)79int WebPValidateConfig(const WebPConfig* const config) { 80 if (config == NULL) return 0; 81 if (config->quality < 0 || config->quality > 100) 82 return 0; 83 if (config->target_size < 0) 84 return 0; 85 if (config->target_PSNR < 0) 86 return 0; 87 if (config->method < 0 || config->method > 6) 88 return 0; 89 if (config->segments < 1 || config->segments > 4) 90 return 0; 91 if (config->sns_strength < 0 || config->sns_strength > 100) 92 return 0; 93 if (config->filter_strength < 0 || config->filter_strength > 100) 94 return 0; 95 if (config->filter_sharpness < 0 || config->filter_sharpness > 7) 96 return 0; 97 if (config->filter_type < 0 || config->filter_type > 1) 98 return 0; 99 if (config->autofilter < 0 || config->autofilter > 1) 100 return 0; 101 if (config->pass < 1 || config->pass > 10) 102 return 0; 103 if (config->show_compressed < 0 || config->show_compressed > 1) 104 return 0; 105 if (config->preprocessing < 0 || config->preprocessing > 1) 106 return 0; 107 if (config->partitions < 0 || config->partitions > 3) 108 return 0; 109 if (config->alpha_compression < 0) 110 return 0; 111 return 1; 112 } 113 114 //----------------------------------------------------------------------------- 115 116 #if defined(__cplusplus) || defined(c_plusplus) 117 } // extern "C" 118 #endif 119