Parameters passed to the blit function

Listing 3 is very similar to Listing 2.

However, the last three parameters to the blit function are different between the two.

The last two parameters in Listing 3 specify that:

• A rectangular area (294x321) of the source bitmap
• Is to be copied to the destination bitmap.

The first two parameters specify that:

• The upper-left corner of the rectangle is at 0,0 in the source bitmap.

(Those four parameters taken together specify that the entire source bitmap is to be copied, but I needed to know the dimensions of the original image in order to know that.)