Function setMapPixelsOwnership

src/OpenLoco/src/Ui/Windows/MapWindow.cpp:814–935

0x0046CD31

    // 0x0046CD31
    static void setMapPixelsOwnership(PaletteIndex_t* mapPtr, PaletteIndex_t* mapAltPtr, Pos2 pos, Pos2 delta)
    {
        for (auto rowCountLeft = kMapColumns; rowCountLeft > 0; rowCountLeft--)
        {
            // Coords shouldn't be at map edge
            if (!(pos.x > 0 && pos.y > 0 && pos.x < kMapWidth - kTileSize && pos.y < kMapHeight - kTileSize))
            {
                pos += delta;
                mapPtr += kRenderedMapWidth + 1;
                mapAltPtr += kRenderedMapWidth + 1;
                continue;
            }

            bool haveTrackOrRoad = false; // ch
            PaletteIndex_t colourFlash0{}, colourFlash1{}, colour0{}, colour1{};
            auto tile = TileManager::get(pos);
            for (auto& el : tile)
            {
                switch (el.type())
                {
                    case ElementType::surface:
                    {
                        auto* surfaceEl = el.as<SurfaceElement>();
                        if (surfaceEl == nullptr)
                        {
                            continue;
                        }

                        uint8_t terrainColour0{}, terrainColour1{};
                        if (surfaceEl->water() == 0)
                        {
                            const auto* landObj = ObjectManager::get<LandObject>(surfaceEl->terrain());
                            const auto* landImage = Gfx::getG1Element(landObj->mapPixelImage);
                            terrainColour0 = landImage->offset[0];
                            terrainColour1 = landImage->offset[1];
                        }
                        else
                        {
                            const auto* waterObj = ObjectManager::get<WaterObject>();
                            const auto* waterImage = Gfx::getG1Element(waterObj->mapPixelImage);
                            terrainColour0 = waterImage->offset[0];
                            terrainColour1 = waterImage->offset[1];
                        }

                        colour0 = colourFlash0 = terrainColour0;
                        if (!haveTrackOrRoad)
                        {
                            colour1 = colourFlash1 = terrainColour1;
                        }
                        break;
                    }

                    case ElementType::track:
                    case ElementType::station:
                    case ElementType::road:
                    {
                        if (el.isGhost() || el.isAiAllocated())
                        {