/*
 * 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.
 */

/** \file
 * \ingroup imbdds
 */

/*
 * This file is based on a similar file from the NVIDIA texture tools
 * (http://nvidia-texture-tools.googlecode.com/)
 *
 * Original license from NVIDIA follows.
 */

/* This code is in the public domain -- <castanyo@yahoo.es> */

#pragma once

#include <Color.h>
#include <Image.h>

/** Uncompressed 4x4 color block. */
struct ColorBlock {
  ColorBlock() = default;
  /** Init the color block from an array of colors. */
  ColorBlock(const uint *linearImage);
  /** Init the color block with the contents of the given block. */
  ColorBlock(const ColorBlock &block);
  /** Initialize this color block. */
  ColorBlock(const Image *img, uint x, uint y);

  void init(const Image *img, uint x, uint y);
  void init(uint w, uint h, const uint *data, uint x, uint y);
  void init(uint w, uint h, const float *data, uint x, uint y);

  void swizzle(uint x, uint y, uint z, uint w); /* 0=r, 1=g, 2=b, 3=a, 4=0xFF, 5=0 */

  /** Returns true if the block has a single color. */
  bool isSingleColor(Color32 mask = Color32(0xFF, 0xFF, 0xFF, 0x00)) const;
  /** Return true if the block is not fully opaque. */
  bool hasAlpha() const;

  /* Accessors */
  const Color32 *colors() const;

  Color32 color(uint i) const;
  Color32 &color(uint i);

  Color32 color(uint x, uint y) const;
  Color32 &color(uint x, uint y);

 private:
  Color32 m_color[4 * 4];
};

/** Get pointer to block colors. */
inline const Color32 *ColorBlock::colors() const
{
  return m_color;
}

/** Get block color. */
inline Color32 ColorBlock::color(uint i) const
{
  return m_color[i];
}

/** Get block color. */
inline Color32 &ColorBlock::color(uint i)
{
  return m_color[i];
}

/** Get block color. */
inline Color32 ColorBlock::color(uint x, uint y) const
{
  return m_color[y * 4 + x];
}

/** Get block color. */
inline Color32 &ColorBlock::color(uint x, uint y)
{
  return m_color[y * 4 + x];
}