Method UpdatePixel

src/Map.cpp:196–331

bool cMap::UpdatePixel(unsigned int a_X, unsigned int a_Z)
{
	unsigned int PixelWidth = GetPixelWidth();

	int BlockX = m_CenterX + ((a_X - (m_Width  / 2)) * PixelWidth);
	int BlockZ = m_CenterZ + ((a_Z - (m_Height / 2)) * PixelWidth);

	int ChunkX, ChunkY, ChunkZ;
	m_World->BlockToChunk(BlockX, 0, BlockZ, ChunkX, ChunkY, ChunkZ);

	int RelX = BlockX - (ChunkX * cChunkDef::Width);
	int RelZ = BlockZ - (ChunkZ * cChunkDef::Width);

	class cCalculatePixelCb :
		public cChunkCallback
	{
		cMap * m_Map;

		int m_RelX, m_RelZ;

		ColorID m_PixelData;

	public:
		cCalculatePixelCb(cMap * a_Map, int a_RelX, int a_RelZ)
			: m_Map(a_Map), m_RelX(a_RelX), m_RelZ(a_RelZ), m_PixelData(E_BASE_COLOR_TRANSPARENT) {}

		virtual bool Item(cChunk * a_Chunk) override
		{
			if (a_Chunk == NULL)
			{
				return false;
			}

			unsigned int PixelWidth = m_Map->GetPixelWidth();

			if (m_Map->GetDimension() == dimNether)
			{
				// TODO 2014-02-22 xdot: Nether maps

				return false;
			}

			typedef std::map<ColorID, unsigned int> ColorCountMap;
			ColorCountMap ColorCounts;

			// Count surface blocks
			for (unsigned int X = m_RelX; X < m_RelX + PixelWidth; ++X)
			{
				for (unsigned int Z = m_RelZ; Z < m_RelZ + PixelWidth; ++Z)
				{
					// unsigned int WaterDepth = 0;

					BLOCKTYPE TargetBlock = E_BLOCK_AIR;
					NIBBLETYPE TargetMeta = 0;

					int Height = a_Chunk->GetHeight(X, Z);

					while (Height > 0)