/*
 * Copyright (C) 2006-2019 Christopho, Solarus - http://www.solarus-games.org
 *
 * Solarus is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Solarus is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
#include "solarus/graphics/Hq4xFilter.h"
#include "solarus/third_party/hqx/hqx.h"

namespace Solarus {

namespace {
  bool hqx_initialized = false;   /**< Whether the common hqx initialization was done. */
}

/**
 * \brief Constructor.
 */
Hq4xFilter::Hq4xFilter():
  SoftwarePixelFilter() {
}

/**
 * \copydoc PixelFilter::get_scaling_factor
 */
int Hq4xFilter::get_scaling_factor() const {
  return 4;
}

/**
 * \copydoc PixelFilter::filter
 */
void Hq4xFilter::filter(
    const uint32_t* src,
    int src_width,
    int src_height,
    uint32_t* dst) const {

  // Make sure hqx is initialized.
  initialize_hqx();

  hq4x_32(const_cast<uint32_t*>(src), dst, src_width, src_height);
}

/**
 * \brief Performs the initialization common to the 3 variants of hqx.
 *
 * Does nothing if the initialization was already done.
 */
void Hq4xFilter::initialize_hqx() {

  if (!hqx_initialized) {
    hqx_initialized = true;
    hqxInit();
  }
}

}

