Allegro Programming Tutorial, by Richard G Baldwin

Set pixel colors in the off-screen bitmap

Listing 3 uses a pair of nested for loops to:

Cycle through the rows and columns of pixels in the off-screen bitmap
- Setting the color values for each individual pixel.

Listing 3. Set pixel colors in the off-screen bitmap.

for(int row = 0;row < 255;row++){ for(int column = 0;column < 255;column++){ putpixel(buffer,column,row,makecol(column,row,128)); }//end loop row }//end loop on column