remove SK_SCALAR_IS_[FLOAT,FIXED] and assume floats

src/effects/SkArithmeticMode.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkArithmeticMode.h"
 #include "SkColorPriv.h"
 #include "SkFlattenableBuffers.h"
@@ skipping 166 matching lines @@
         if (i < 3) {
             str->append(" ");
         }
     }
 }
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static bool fitsInBits(SkScalar x, int bits) {
-#ifdef SK_SCALAR_IS_FIXED
-    x = SkAbs32(x);
-    x += 1 << 7;
-    x >>= 8;
-    return x < (1 << (bits - 1));
-#else
     return SkScalarAbs(x) < (1 << (bits - 1));
-#endif
 }
 
 #if 0 // UNUSED
 static int32_t toDot8(SkScalar x) {
-#ifdef SK_SCALAR_IS_FIXED
-    x += 1 << 7;
-    x >>= 8;
-    return x;
-#else
     return (int32_t)(x * 256);
-#endif
 }
 #endif
 
 SkXfermode* SkArithmeticMode::Create(SkScalar k1, SkScalar k2,
                                      SkScalar k3, SkScalar k4) {
     if (fitsInBits(k1, 8) && fitsInBits(k2, 16) &&
         fitsInBits(k2, 16) && fitsInBits(k2, 24)) {
 
 #if 0 // UNUSED
         int32_t i1 = toDot8(k1);
@@ skipping 201 matching lines @@
                                              background);
     }
     return true;
 }
 
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkArithmeticMode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArithmeticMode_scalar)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END