Method loadSpk

src/Engine/Surface.cpp:278–325

* Loads the contents of an X-Com SPK image file into * the surface. SPK files are compressed with a custom * algorithm since they're usually full-screen images. * @param filename Filename of the SPK image. * @sa http://www.ufopaedia.org/index.php?title=Image_Formats#SPK */

 * @sa http://www.ufopaedia.org/index.php?title=Image_Formats#SPK
 */
void Surface::loadSpk(const std::string &filename)
{
	// Load file and put pixels in surface
	std::ifstream imgFile (filename.c_str(), std::ios::in | std::ios::binary);
	if (!imgFile)
	{
		throw Exception(filename + " not found");
	}

	// Lock the surface
	lock();

	Uint16 flag;
	Uint8 value;
	int x = 0, y = 0;

	while (imgFile.read((char*)&flag, sizeof(flag)))
	{
		flag = SDL_SwapLE16(flag);

		if (flag == 65535)
		{
			imgFile.read((char*)&flag, sizeof(flag));
			flag = SDL_SwapLE16(flag);

			for (int i = 0; i < flag * 2; ++i)
			{
				setPixelIterative(&x, &y, 0);
			}
		}
		else if (flag == 65534)
		{
			imgFile.read((char*)&flag, sizeof(flag));
			flag = SDL_SwapLE16(flag);

			for (int i = 0; i < flag * 2; ++i)
			{
				imgFile.read((char*)&value, 1);
				setPixelIterative(&x, &y, value);
			}
		}
	}

	// Unlock the surface
	unlock();

	imgFile.close();
}

/**
 * Loads the contents of a TFTD BDY image file into