Kandinsky: Use KDCoordinateMax

Change-Id: I2b00caec2919496c0b69313f2b4a24b8c69688da

kandinsky/include/kandinsky/types.h

@@ -4,6 +4,7 @@
 #include <stdint.h>
 
 typedef int16_t KDCoordinate;
+#define KDCoordinateMax ((KDCoordinate)((1<<15)-1))
 
 typedef struct {
   KDCoordinate x;

kandinsky/src/pixel.c

@@ -5,8 +5,8 @@
 static KDRect sDrawingArea = {
   .x = 0,
   .y = 0,
-  .width = 9999, // TODO: KDCoordinateMax
-  .height = 9999 // TODO: KDCoordinateMax
+  .width = KDCoordinateMax,
+  .height = KDCoordinateMax
 };
 
 void KDSetDrawingArea(KDRect rect) {