Function readImage

YUViewLib/src/decoder/decoderTarga.cpp:492–559

}

dec::Targa::Image readImage(std::ifstream &file, const Header &header)
{
  dec::Targa::Image image;
  image.size.width  = header.width;
  image.size.height = header.height;
  image.data.resize(header.width * 4 * header.height);

  // Bit 4 means right-to-left, else left-to-right
  // Bit 5 means top-to-bottom, else bottom-to-top

  for (int y = 0; y < header.height; ++y)
  {
    if (header.imageType == ImageType::UncompressedIndexed)
    {
      assert(header.bitsPerPixel == 8);
      for (int x = 0; x < header.width; ++x)
      {
        auto colormapIdx = read8(file);
        auto color       = header.colormap[colormapIdx];
        setColorInImage(image, color, x, y, header);
      }
    }
    else if (header.imageType == ImageType::UncompressedRgb)
    {
      color_t color{};
      for (int x = 0; x < header.width; ++x)
      {
        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;
        }
        setColorInImage(image, color, x, y, header);
      }
    }
    else if (header.imageType == ImageType::UncompressedGray)
    {
      assert(header.bitsPerPixel == 8);
      for (int x = 0; x < header.width; ++x)
      {
        auto greyValue = read8(file);
        setColorInImage(image, rgba(greyValue, greyValue, greyValue, 255), x, y, header);
      }
    }
    else if (header.imageType == ImageType::RleIndexed || header.imageType == ImageType::RleGray)
    {
      assert(header.bitsPerPixel == 8);