palette_io.cpp

// Aseprite Document Library
// Copyright (c) 2001-2018 David Capello
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "doc/palette_io.h"

#include "base/serialization.h"
#include "doc/palette.h"

#include <iostream>
#include <memory>

namespace doc {

using namespace base::serialization;
using namespace base::serialization::little_endian;

// Serialized Palette data:
//
//   WORD               Frame
//   WORD               Number of colors
//   for each color     ("ncolors" times)
//     DWORD            _rgba color

void write_palette(std::ostream& os, const Palette* palette)
{
  write16(os, palette->frame()); // Frame
  write16(os, palette->size());  // Number of colors

  for (int c=0; c<palette->size(); c++) {
    uint32_t color = palette->getEntry(c);
    write32(os, color);
  }
}

Palette* read_palette(std::istream& is)
{
  frame_t frame(read16(is)); // Frame
  int ncolors = read16(is);      // Number of colors

  std::unique_ptr<Palette> palette(new Palette(frame, ncolors));

  for (int c=0; c<ncolors; ++c) {
    uint32_t color = read32(is);
    palette->setEntry(c, color);
  }

  return palette.release();
}

}