| // Copyright 2011 Google Inc. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the COPYING file in the root of the source |
| // tree. An additional intellectual property rights grant can be found |
| // in the file PATENTS. All contributing project authors may |
| // be found in the AUTHORS file in the root of the source tree. |
| // ----------------------------------------------------------------------------- |
| // |
| // Coding tools configuration |
| // |
| // Author: Skal (pascal.massimino@gmail.com) |
| |
| #include "../webp/encode.h" |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| extern "C" { |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // WebPConfig |
| //------------------------------------------------------------------------------ |
| |
| int WebPConfigInitInternal(WebPConfig* config, |
| WebPPreset preset, float quality, int version) { |
| if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_ENCODER_ABI_VERSION)) { |
| return 0; // caller/system version mismatch! |
| } |
| if (config == NULL) return 0; |
| |
| config->quality = quality; |
| config->target_size = 0; |
| config->target_PSNR = 0.; |
| config->method = 4; |
| config->sns_strength = 50; |
| config->filter_strength = 60; // rather high filtering, helps w/ gradients. |
| config->filter_sharpness = 0; |
| config->filter_type = 1; // default: strong (so U/V is filtered too) |
| config->partitions = 0; |
| config->segments = 4; |
| config->pass = 1; |
| config->show_compressed = 0; |
| config->preprocessing = 0; |
| config->autofilter = 0; |
| config->partition_limit = 0; |
| config->alpha_compression = 1; |
| config->alpha_filtering = 1; |
| config->alpha_quality = 100; |
| config->lossless = 0; |
| config->image_hint = WEBP_HINT_DEFAULT; |
| config->emulate_jpeg_size = 0; |
| config->thread_level = 0; |
| config->low_memory = 0; |
| |
| // TODO(skal): tune. |
| switch (preset) { |
| case WEBP_PRESET_PICTURE: |
| config->sns_strength = 80; |
| config->filter_sharpness = 4; |
| config->filter_strength = 35; |
| break; |
| case WEBP_PRESET_PHOTO: |
| config->sns_strength = 80; |
| config->filter_sharpness = 3; |
| config->filter_strength = 30; |
| break; |
| case WEBP_PRESET_DRAWING: |
| config->sns_strength = 25; |
| config->filter_sharpness = 6; |
| config->filter_strength = 10; |
| break; |
| case WEBP_PRESET_ICON: |
| config->sns_strength = 0; |
| config->filter_strength = 0; // disable filtering to retain sharpness |
| break; |
| case WEBP_PRESET_TEXT: |
| config->sns_strength = 0; |
| config->filter_strength = 0; // disable filtering to retain sharpness |
| config->segments = 2; |
| break; |
| case WEBP_PRESET_DEFAULT: |
| default: |
| break; |
| } |
| return WebPValidateConfig(config); |
| } |
| |
| int WebPValidateConfig(const WebPConfig* config) { |
| if (config == NULL) return 0; |
| if (config->quality < 0 || config->quality > 100) |
| return 0; |
| if (config->target_size < 0) |
| return 0; |
| if (config->target_PSNR < 0) |
| return 0; |
| if (config->method < 0 || config->method > 6) |
| return 0; |
| if (config->segments < 1 || config->segments > 4) |
| return 0; |
| if (config->sns_strength < 0 || config->sns_strength > 100) |
| return 0; |
| if (config->filter_strength < 0 || config->filter_strength > 100) |
| return 0; |
| if (config->filter_sharpness < 0 || config->filter_sharpness > 7) |
| return 0; |
| if (config->filter_type < 0 || config->filter_type > 1) |
| return 0; |
| if (config->autofilter < 0 || config->autofilter > 1) |
| return 0; |
| if (config->pass < 1 || config->pass > 10) |
| return 0; |
| if (config->show_compressed < 0 || config->show_compressed > 1) |
| return 0; |
| if (config->preprocessing < 0 || config->preprocessing > 1) |
| return 0; |
| if (config->partitions < 0 || config->partitions > 3) |
| return 0; |
| if (config->partition_limit < 0 || config->partition_limit > 100) |
| return 0; |
| if (config->alpha_compression < 0) |
| return 0; |
| if (config->alpha_filtering < 0) |
| return 0; |
| if (config->alpha_quality < 0 || config->alpha_quality > 100) |
| return 0; |
| if (config->lossless < 0 || config->lossless > 1) |
| return 0; |
| if (config->image_hint >= WEBP_HINT_LAST) |
| return 0; |
| if (config->emulate_jpeg_size < 0 || config->emulate_jpeg_size > 1) |
| return 0; |
| if (config->thread_level < 0 || config->thread_level > 1) |
| return 0; |
| if (config->low_memory < 0 || config->low_memory > 1) |
| return 0; |
| return 1; |
| } |
| |
| //------------------------------------------------------------------------------ |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| } // extern "C" |
| #endif |