Normal quotes

42-04.md

@@ -71,16 +71,16 @@
        } while (--DeltaX);
     }
 
-Listing 42.1 isn’t particularly fast, because it calls **DrawPixel()**
+Listing 42.1 isn't particularly fast, because it calls **DrawPixel()**
 for each pixel. On the other hand, **DrawPixel()** makes it easy to try
 out Wu antialiasing in a variety of modes; just adapt the code in
 Listing 42.3 for the 256-color mode you want to support. For example,
 Listing 42.5 shows code to draw Wu-antialiased lines in 640x480
 256-color mode on SuperVGAs built around the Tseng Labs ET4000 chip with
-at least 512K of display memory installed. It’s well worth checking out
+at least 512K of display memory installed. It's well worth checking out
 Wu antialiasing at 640x480. Although antialiased lines look much
-smoother than normal lines at 320x200 resolution, they’re far from
-perfect, because the pixels are so big that the eye can’t blend them
+smoother than normal lines at 320x200 resolution, they're far from
+perfect, because the pixels are so big that the eye can't blend them
 properly. At 640x480, however, Wu-antialiased lines look fabulous; from
 a couple of feet away, they look as straight and smooth as if they were
 drawn with a ruler.
@@ -136,10 +136,10 @@ says that 32 intensities are enough; on my system, eight and even four
 levels looked pretty good. I found that gamma correction, which gives
 linearly spaced intensity steps, improved antialiasing quality
 significantly. Fortunately, we can program the palette with
-gamma-corrected values, so our drawing code doesn’t have to do any extra
+gamma-corrected values, so our drawing code doesn't have to do any extra
 work.
 
-Listing 42.1 isn’t very fast, so I implemented Wu antialiasing in
+Listing 42.1 isn't very fast, so I implemented Wu antialiasing in
 assembly, hard-coded for mode 13H. The implementation is shown in full
 in Listing 42.6. High-speed graphics code and fast VGAs go together like
 peanut butter and jelly, which is to say very well indeed; the assembly