/*
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Copyright 2011, Blender Foundation.
 */

#pragma once

#include "BLI_rect.h"
#include "COM_defines.h"

#ifdef WITH_CXX_GUARDEDALLOC
#  include "MEM_guardedalloc.h"
#endif

typedef enum PixelSampler {
  COM_PS_NEAREST = 0,
  COM_PS_BILINEAR = 1,
  COM_PS_BICUBIC = 2,
} PixelSampler;

class MemoryBuffer;
/**
 * \brief Helper class for reading socket data.
 * Only use this class for dispatching (un-ary and n-ary) executions.
 * \ingroup Execution
 */
class SocketReader {
 private:
 protected:
  /**
   * \brief Holds the width of the output of this operation.
   */
  unsigned int m_width;

  /**
   * \brief Holds the height of the output of this operation.
   */
  unsigned int m_height;

  /**
   * \brief calculate a single pixel
   * \note this method is called for non-complex
   * \param result: is a float[4] array to store the result
   * \param x: the x-coordinate of the pixel to calculate in image space
   * \param y: the y-coordinate of the pixel to calculate in image space
   * \param inputBuffers: chunks that can be read by their ReadBufferOperation.
   */
  virtual void executePixelSampled(float /*output*/[4],
                                   float /*x*/,
                                   float /*y*/,
                                   PixelSampler /*sampler*/)
  {
  }

  /**
   * \brief calculate a single pixel
   * \note this method is called for complex
   * \param result: is a float[4] array to store the result
   * \param x: the x-coordinate of the pixel to calculate in image space
   * \param y: the y-coordinate of the pixel to calculate in image space
   * \param inputBuffers: chunks that can be read by their ReadBufferOperation.
   * \param chunkData: chunk specific data a during execution time.
   */
  virtual void executePixel(float output[4], int x, int y, void * /*chunkData*/)
  {
    executePixelSampled(output, x, y, COM_PS_NEAREST);
  }

  /**
   * \brief calculate a single pixel using an EWA filter
   * \note this method is called for complex
   * \param result: is a float[4] array to store the result
   * \param x: the x-coordinate of the pixel to calculate in image space
   * \param y: the y-coordinate of the pixel to calculate in image space
   * \param dx:
   * \param dy:
   * \param inputBuffers: chunks that can be read by their ReadBufferOperation.
   */
  virtual void executePixelFiltered(
      float /*output*/[4], float /*x*/, float /*y*/, float /*dx*/[2], float /*dy*/[2])
  {
  }

 public:
  inline void readSampled(float result[4], float x, float y, PixelSampler sampler)
  {
    executePixelSampled(result, x, y, sampler);
  }
  inline void read(float result[4], int x, int y, void *chunkData)
  {
    executePixel(result, x, y, chunkData);
  }
  inline void readFiltered(float result[4], float x, float y, float dx[2], float dy[2])
  {
    executePixelFiltered(result, x, y, dx, dy);
  }

  virtual void *initializeTileData(rcti * /*rect*/)
  {
    return 0;
  }
  virtual void deinitializeTileData(rcti * /*rect*/, void * /*data*/)
  {
  }

  virtual ~SocketReader()
  {
  }

  virtual MemoryBuffer *getInputMemoryBuffer(MemoryBuffer ** /*memoryBuffers*/)
  {
    return 0;
  }

  inline unsigned int getWidth() const
  {
    return this->m_width;
  }
  inline unsigned int getHeight() const
  {
    return this->m_height;
  }

#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("COM:SocketReader")
#endif
};