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In my case speed requirement is critical, but your reply makes me think!
I need a more general approach that always starts from the original, instead of considering the last zoomed stuff.. this solves also the problem of zooming out back thanks!

Greetings Elder0010.

I'll have to dust off my C64.

shame on you 

Hey there, i'm trying to code a realtime text zoomscroller but i'm having some issues to find a proper algorithm.

Here is what i have in mind:
assuming that each char is an 8X8 pixel square for example:
00000000
00000000
01111100
01100100
01111100
01100000
01100000
01000000
(this can be the letter P - 1 byte per line)

assuming that i want to zoom from 1X1 to 2X2, for each step of the algorithm i have to double only certain couple of pixels, for x and y like

STEP1 (one step per frame - i double the the border pixels)
//X zoom
foreach row of the char (1 byte)
  double pixel (row+0)  //first  pixel of each row
  double pixel (row+7)  //Last pixel of each row
endforeach

//Y zoom
foreach col of the char (1 byte, formed by "vertical" pixels)
  double pixel (colum+0) //First pixel of each column
  double pixel (column+56) //last pixel of each column
endforeach
-----------------------------------------------------------------------
STEP2 (i double the leftborder+1 pixel and rightborder-1 pixels)
//X zoom
foreach row of the char (1 byte)
  double pixel (row+1)  //second  pixel of each row
  double pixel (row+6)  //last-1 pixel of each row
endforeach

//Y zoom
foreach col of the char (1 byte, formed by "vertical" pixels)
  double pixel (colum+1) //Second pixel of each column
  double pixel (column+56) //last-1 pixel of each column
endforeach

(repeat for 7 frames to obtain a 1X1 to 2X2 zoom)

What do you think? This effect is quite common in all oldschool demos, so i know that it's doable with my C64. My approach is surely NOT optimized

thank you guys! the atmosphere seems very friendly here!

Hey guys, i've just registered. I'm not an expert and i really would like to improve my skill in coding
Currently i have released a trackmo and an intro and i'm in Onslaught.
You can find my productions here http://csdb.dk/scener/?id=22731.