Faster tiling methods?

Erm, this is basically the method I'm using.

It loads in a map from an array (hence the post I made on the main C++ forum). It then basically runs the array through this mass case/switch/for katamar:

Code:

int genMap()
{
     int xp = 0;
     int yp = 0;
     for(int x=0; x<10; x++)
     {
          for(int y=0; y<10; y++)
          {
               switch(map[x][y])
               {
                    case 'W': 
                         drawImg(water_tile00, xp, yp);
                         break;                        
                    case 'M':
                         drawImg(mount_tile00, xp, yp);
                         break;
                    case 'G':
                         drawImg(grass_tile00, xp, yp);
                         break;                         
               }
               if(xp == 288)
               {
                    xp = 0;
                    break;
               } 
               else
               {
                    xp = xp + 32;
               }
          }
          
          yp = yp + 32;
     }          
     return 0;
}

Just wondering if this'll get slow with bigger maps with more than three tiles. It looks like it probably will. My other method involved creating an array of SDL_Surfaces too, for some reason. No idea why. That'd add a lot more code. Array is what I want when I create a tile class, I assume (at which point, I can just hardcode in tile data, and have an array of tile pointers point to the tiles, I assume? [MY GOD REDUNDANT {Redundancy is actually my god}]).

Anyway, currently working on cleaning up source code (and adding classes proper). Maybe something'll come to me in the process.

(Also, I know I should be using tilesets and classes to handle tiles. This is more proof of concept for myself).

You can cut down on code and get a slight speed incase by having a tile index in your tile map and using it to index a tile array.
exmample

Code:

    for(int x=0; x<10; x++)
     {
          for(int y=0; y<10; y++)
             drawImg(Tiles[Map[x][Y]], xp, yp);
                         
}

And cut down more by using a linear array instead of a 2D.