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 | #ifdef HAVE_CONFIG_H |
15 | #include "src/webp/config.h" |
16 | #endif |
17 | |
18 | #include "src/webp/encode.h" |
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; // mid-filtering |
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->exact = 0; |
51 | config->image_hint = WEBP_HINT_DEFAULT; |
52 | config->emulate_jpeg_size = 0; |
53 | config->thread_level = 0; |
54 | config->low_memory = 0; |
55 | config->near_lossless = 100; |
56 | config->use_delta_palette = 0; |
57 | config->use_sharp_yuv = 0; |
58 | |
59 | // TODO(skal): tune. |
60 | switch (preset) { |
61 | case WEBP_PRESET_PICTURE: |
62 | config->sns_strength = 80; |
63 | config->filter_sharpness = 4; |
64 | config->filter_strength = 35; |
65 | config->preprocessing &= ~2; // no dithering |
66 | break; |
67 | case WEBP_PRESET_PHOTO: |
68 | config->sns_strength = 80; |
69 | config->filter_sharpness = 3; |
70 | config->filter_strength = 30; |
71 | config->preprocessing |= 2; |
72 | break; |
73 | case WEBP_PRESET_DRAWING: |
74 | config->sns_strength = 25; |
75 | config->filter_sharpness = 6; |
76 | config->filter_strength = 10; |
77 | break; |
78 | case WEBP_PRESET_ICON: |
79 | config->sns_strength = 0; |
80 | config->filter_strength = 0; // disable filtering to retain sharpness |
81 | config->preprocessing &= ~2; // no dithering |
82 | break; |
83 | case WEBP_PRESET_TEXT: |
84 | config->sns_strength = 0; |
85 | config->filter_strength = 0; // disable filtering to retain sharpness |
86 | config->preprocessing &= ~2; // no dithering |
87 | config->segments = 2; |
88 | break; |
89 | case WEBP_PRESET_DEFAULT: |
90 | default: |
91 | break; |
92 | } |
93 | return WebPValidateConfig(config); |
94 | } |
95 | |
96 | int WebPValidateConfig(const WebPConfig* config) { |
97 | if (config == NULL) return 0; |
98 | if (config->quality < 0 || config->quality > 100) return 0; |
99 | if (config->target_size < 0) return 0; |
100 | if (config->target_PSNR < 0) return 0; |
101 | if (config->method < 0 || config->method > 6) return 0; |
102 | if (config->segments < 1 || config->segments > 4) return 0; |
103 | if (config->sns_strength < 0 || config->sns_strength > 100) return 0; |
104 | if (config->filter_strength < 0 || config->filter_strength > 100) return 0; |
105 | if (config->filter_sharpness < 0 || config->filter_sharpness > 7) return 0; |
106 | if (config->filter_type < 0 || config->filter_type > 1) return 0; |
107 | if (config->autofilter < 0 || config->autofilter > 1) return 0; |
108 | if (config->pass < 1 || config->pass > 10) return 0; |
109 | if (config->show_compressed < 0 || config->show_compressed > 1) return 0; |
110 | if (config->preprocessing < 0 || config->preprocessing > 7) return 0; |
111 | if (config->partitions < 0 || config->partitions > 3) return 0; |
112 | if (config->partition_limit < 0 || config->partition_limit > 100) return 0; |
113 | if (config->alpha_compression < 0) return 0; |
114 | if (config->alpha_filtering < 0) return 0; |
115 | if (config->alpha_quality < 0 || config->alpha_quality > 100) return 0; |
116 | if (config->lossless < 0 || config->lossless > 1) return 0; |
117 | if (config->near_lossless < 0 || config->near_lossless > 100) return 0; |
118 | if (config->image_hint >= WEBP_HINT_LAST) return 0; |
119 | if (config->emulate_jpeg_size < 0 || config->emulate_jpeg_size > 1) return 0; |
120 | if (config->thread_level < 0 || config->thread_level > 1) return 0; |
121 | if (config->low_memory < 0 || config->low_memory > 1) return 0; |
122 | if (config->exact < 0 || config->exact > 1) return 0; |
123 | if (config->use_delta_palette < 0 || config->use_delta_palette > 1) { |
124 | return 0; |
125 | } |
126 | if (config->use_sharp_yuv < 0 || config->use_sharp_yuv > 1) return 0; |
127 | |
128 | return 1; |
129 | } |
130 | |
131 | //------------------------------------------------------------------------------ |
132 | |
133 | #define MAX_LEVEL 9 |
134 | |
135 | // Mapping between -z level and -m / -q parameter settings. |
136 | static const struct { |
137 | uint8_t method_; |
138 | uint8_t quality_; |
139 | } kLosslessPresets[MAX_LEVEL + 1] = { |
140 | { 0, 0 }, { 1, 20 }, { 2, 25 }, { 3, 30 }, { 3, 50 }, |
141 | { 4, 50 }, { 4, 75 }, { 4, 90 }, { 5, 90 }, { 6, 100 } |
142 | }; |
143 | |
144 | int WebPConfigLosslessPreset(WebPConfig* config, int level) { |
145 | if (config == NULL || level < 0 || level > MAX_LEVEL) return 0; |
146 | config->lossless = 1; |
147 | config->method = kLosslessPresets[level].method_; |
148 | config->quality = kLosslessPresets[level].quality_; |
149 | return 1; |
150 | } |
151 | |
152 | //------------------------------------------------------------------------------ |
153 | |