// 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)

#ifdef HAVE_CONFIG_H

#include "src/webp/config.h"

#endif

#include <stddef.h>

#include "src/webp/encode.h"

#include "src/webp/types.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->qmin = 0;

  config->qmax = 100;

  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->exact = 0;

  config->image_hint = WEBP_HINT_DEFAULT;

  config->emulate_jpeg_size = 0;

  config->thread_level = 0;

  config->low_memory = 0;

  config->near_lossless = 100;

  config->use_sharp_yuv = 0;

  // 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->qmin < 0 || config->qmax > 100 || config->qmin > config->qmax) {

    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;

  if (config->exact < 0 || config->exact > 1) return 0;

  if (config->use_sharp_yuv < 0 || config->use_sharp_yuv > 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;

}

//------------------------------------------------------------------------------