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 (at) 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 22 int 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 = 60; // rather high filtering, helps w/ gradients. 35 config->filter_sharpness = 0; 36 config->filter_type = 1; // default: strong (so U/V is filtered too) 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 config->emulate_jpeg_size = 0; 50 config->thread_level = 0; 51 config->low_memory = 0; 52 53 // TODO(skal): tune. 54 switch (preset) { 55 case WEBP_PRESET_PICTURE: 56 config->sns_strength = 80; 57 config->filter_sharpness = 4; 58 config->filter_strength = 35; 59 break; 60 case WEBP_PRESET_PHOTO: 61 config->sns_strength = 80; 62 config->filter_sharpness = 3; 63 config->filter_strength = 30; 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 break; 74 case WEBP_PRESET_TEXT: 75 config->sns_strength = 0; 76 config->filter_strength = 0; // disable filtering to retain sharpness 77 config->segments = 2; 78 break; 79 case WEBP_PRESET_DEFAULT: 80 default: 81 break; 82 } 83 return WebPValidateConfig(config); 84 } 85 86 int WebPValidateConfig(const WebPConfig* config) { 87 if (config == NULL) return 0; 88 if (config->quality < 0 || config->quality > 100) 89 return 0; 90 if (config->target_size < 0) 91 return 0; 92 if (config->target_PSNR < 0) 93 return 0; 94 if (config->method < 0 || config->method > 6) 95 return 0; 96 if (config->segments < 1 || config->segments > 4) 97 return 0; 98 if (config->sns_strength < 0 || config->sns_strength > 100) 99 return 0; 100 if (config->filter_strength < 0 || config->filter_strength > 100) 101 return 0; 102 if (config->filter_sharpness < 0 || config->filter_sharpness > 7) 103 return 0; 104 if (config->filter_type < 0 || config->filter_type > 1) 105 return 0; 106 if (config->autofilter < 0 || config->autofilter > 1) 107 return 0; 108 if (config->pass < 1 || config->pass > 10) 109 return 0; 110 if (config->show_compressed < 0 || config->show_compressed > 1) 111 return 0; 112 if (config->preprocessing < 0 || config->preprocessing > 1) 113 return 0; 114 if (config->partitions < 0 || config->partitions > 3) 115 return 0; 116 if (config->partition_limit < 0 || config->partition_limit > 100) 117 return 0; 118 if (config->alpha_compression < 0) 119 return 0; 120 if (config->alpha_filtering < 0) 121 return 0; 122 if (config->alpha_quality < 0 || config->alpha_quality > 100) 123 return 0; 124 if (config->lossless < 0 || config->lossless > 1) 125 return 0; 126 if (config->image_hint >= WEBP_HINT_LAST) 127 return 0; 128 if (config->emulate_jpeg_size < 0 || config->emulate_jpeg_size > 1) 129 return 0; 130 if (config->thread_level < 0 || config->thread_level > 1) 131 return 0; 132 if (config->low_memory < 0 || config->low_memory > 1) 133 return 0; 134 return 1; 135 } 136 137 //------------------------------------------------------------------------------ 138 139 #if defined(__cplusplus) || defined(c_plusplus) 140 } // extern "C" 141 #endif 142
