/*
 * 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.
 */

#include "COM_EllipseMaskOperation.h"
#include "BLI_math.h"
#include "DNA_node_types.h"

EllipseMaskOperation::EllipseMaskOperation()
{
  this->addInputSocket(DataType::Value);
  this->addInputSocket(DataType::Value);
  this->addOutputSocket(DataType::Value);
  this->m_inputMask = nullptr;
  this->m_inputValue = nullptr;
  this->m_cosine = 0.0f;
  this->m_sine = 0.0f;
}
void EllipseMaskOperation::initExecution()
{
  this->m_inputMask = this->getInputSocketReader(0);
  this->m_inputValue = this->getInputSocketReader(1);
  const double rad = (double)this->m_data->rotation;
  this->m_cosine = cos(rad);
  this->m_sine = sin(rad);
  this->m_aspectRatio = ((float)this->getWidth()) / this->getHeight();
}

void EllipseMaskOperation::executePixelSampled(float output[4],
                                               float x,
                                               float y,
                                               PixelSampler sampler)
{
  float inputMask[4];
  float inputValue[4];

  float rx = x / this->getWidth();
  float ry = y / this->getHeight();

  const float dy = (ry - this->m_data->y) / this->m_aspectRatio;
  const float dx = rx - this->m_data->x;
  rx = this->m_data->x + (this->m_cosine * dx + this->m_sine * dy);
  ry = this->m_data->y + (-this->m_sine * dx + this->m_cosine * dy);

  this->m_inputMask->readSampled(inputMask, x, y, sampler);
  this->m_inputValue->readSampled(inputValue, x, y, sampler);

  const float halfHeight = (this->m_data->height) / 2.0f;
  const float halfWidth = this->m_data->width / 2.0f;
  float sx = rx - this->m_data->x;
  sx *= sx;
  const float tx = halfWidth * halfWidth;
  float sy = ry - this->m_data->y;
  sy *= sy;
  const float ty = halfHeight * halfHeight;

  bool inside = ((sx / tx) + (sy / ty)) < 1.0f;

  switch (this->m_maskType) {
    case CMP_NODE_MASKTYPE_ADD:
      if (inside) {
        output[0] = MAX2(inputMask[0], inputValue[0]);
      }
      else {
        output[0] = inputMask[0];
      }
      break;
    case CMP_NODE_MASKTYPE_SUBTRACT:
      if (inside) {
        output[0] = inputMask[0] - inputValue[0];
        CLAMP(output[0], 0, 1);
      }
      else {
        output[0] = inputMask[0];
      }
      break;
    case CMP_NODE_MASKTYPE_MULTIPLY:
      if (inside) {
        output[0] = inputMask[0] * inputValue[0];
      }
      else {
        output[0] = 0;
      }
      break;
    case CMP_NODE_MASKTYPE_NOT:
      if (inside) {
        if (inputMask[0] > 0.0f) {
          output[0] = 0;
        }
        else {
          output[0] = inputValue[0];
        }
      }
      else {
        output[0] = inputMask[0];
      }
      break;
  }
}

void EllipseMaskOperation::deinitExecution()
{
  this->m_inputMask = nullptr;
  this->m_inputValue = nullptr;
}