Function readRunLengthColor

YUViewLib/src/decoder/decoderTarga.cpp:308–343

}

color_t readRunLengthColor(std::ifstream &file, const Header &header)
{
  color_t color{};
  if (header.imageType == ImageType::RleIndexed)
  {
    auto colormapIndex = read8(file);
    color              = header.colormap[colormapIndex];
  }
  else if (header.imageType == ImageType::RleGray)
  {
    auto greyValue = read8(file);
    color          = rgba(greyValue, greyValue, greyValue);
  }
  else if (header.imageType == ImageType::RleRgb)
  {
    switch (header.bitsPerPixel)
    {
    case 15:
    case 16:
      color = read16AsRgb(file, header.hasAlpha);
      break;
    case 24:
      color = read24AsRgb(file);
      break;
    case 32:
      color = read32AsRgb(file, header.hasAlpha);
      break;
    default:
      assert(false);
      break;
    }
  }
  else
    assert(false);
  return color;
}

// In the best case (TGA 2.0 spec) this should read just one
// scanline, but in old TGA versions (1.0) it was possible to save