remove use of ubyte like a combined expressions

Author: cyborgar

enemy.p8

@@ -428,9 +428,12 @@ _move_down_else
 
   sub draw() {
     ; Look up sub-byte position
+
     ubyte cur = enemyRef[EN_DIR]
-       + (not enemyRef[EN_SUBPOS] & main.TOPMOST) * 4
-       + (not enemyRef[EN_SUBPOS] & main.LEFTMOST) * 2
+    if (enemyRef[EN_SUBPOS] & main.TOPMOST) == 0
+      cur += 4
+    if (enemyRef[EN_SUBPOS] & main.LEFTMOST) == 0
+      cur += 2
 
     ubyte tmp_x = enemyRef[EN_X]
     ubyte tmp_y = enemyRef[EN_Y]

explosion.p8

@@ -72,8 +72,10 @@ explosion {
     ; Find korrekt animation, first correct "step"
     ubyte gfx_ind = (explosionRef[EX_STAGE] - 1 ) * 8
     ; Correct for nibble shift
-    gfx_ind += (not explosionRef[EX_SUBPOS] & main.TOPMOST) * 4
-    gfx_ind += (not explosionRef[EX_SUBPOS] & main.LEFTMOST) * 2
+    if (explosionRef[EX_SUBPOS] & main.TOPMOST) == 0
+      gfx_ind += 4
+    if (explosionRef[EX_SUBPOS] & main.LEFTMOST) == 0
+      gfx_ind += 2
 
     ; Convert first byte to two PETSCII chars and draw
     ubyte gfx_byte = gfx[gfx_ind]