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| 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@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 //------------------------------------------------------------------------------ | |
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Chromium Code Reviews
Issue 2651883004:
libwebp-0.6.0-rc1 (Closed)
