// 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" //------------------------------------------------------------------------------ // 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; // mid-filtering 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; config->near_lossless = 100; // TODO(skal): tune. switch (preset) { case WEBP_PRESET_PICTURE: config->sns_strength = 80; config->filter_sharpness = 4; config->filter_strength = 35; config->preprocessing &= ~2; // no dithering break; case WEBP_PRESET_PHOTO: config->sns_strength = 80; config->filter_sharpness = 3; config->filter_strength = 30; config->preprocessing |= 2; 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 config->preprocessing &= ~2; // no dithering break; case WEBP_PRESET_TEXT: config->sns_strength = 0; config->filter_strength = 0; // disable filtering to retain sharpness config->preprocessing &= ~2; // no dithering 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 > 7) 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->near_lossless < 0 || config->near_lossless > 100) 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; } //------------------------------------------------------------------------------ #define MAX_LEVEL 9 // Mapping between -z level and -m / -q parameter settings. static const struct { uint8_t method_; uint8_t quality_; } kLosslessPresets[MAX_LEVEL + 1] = { { 0, 0 }, { 1, 20 }, { 2, 25 }, { 3, 30 }, { 3, 50 }, { 4, 50 }, { 4, 75 }, { 4, 90 }, { 5, 90 }, { 6, 100 } }; int WebPConfigLosslessPreset(WebPConfig* config, int level) { if (config == NULL || level < 0 || level > MAX_LEVEL) return 0; config->lossless = 1; config->method = kLosslessPresets[level].method_; config->quality = kLosslessPresets[level].quality_; return 1; } //------------------------------------------------------------------------------