SkPMFloat: fewer internal this->isValid() assertions.

src/core/SkPMFloat.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPM_DEFINED
 #define SkPM_DEFINED
 
@@ skipping 25 matching lines @@
 
     // Freely autoconvert between SkPMFloat and Sk4f.
     /*implicit*/ SkPMFloat(const Sk4f& fs) { fColors = fs; }
     /*implicit*/ operator Sk4f() const { return fColors; }
 
     float a() const { return fColors[SK_A32_SHIFT / 8]; }
     float r() const { return fColors[SK_R32_SHIFT / 8]; }
     float g() const { return fColors[SK_G32_SHIFT / 8]; }
     float b() const { return fColors[SK_B32_SHIFT / 8]; }
 
+    // N.B. All methods returning an SkPMColor call SkPMColorAssert on that result before returning.
+
     // get() and clamped() round component values to the nearest integer.
-    SkPMColor     get() const;  // May SkASSERT(this->isValid()).  Some implementations may clamp.
-    SkPMColor clamped() const;  // Will clamp all values to [0, 255].  Then may assert isValid().
+    SkPMColor     get() const;  // Assumes all values in [0, 255].  Some implementations may clamp.
+    SkPMColor clamped() const;  // Will clamp all values to [0, 255].
 
     // Like get(), but truncates instead of rounding.
     // The domain of this function is (-1.0f, 256.0f).  Values in (-1.0f, 0.0f] trunc to a zero.
     SkPMColor trunc() const;
 
     // 4-at-a-time versions of get() and clamped().  Like From4PMColors(), no alignment assumed.
     static void To4PMColors(
             const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, SkPMColor[4]);
     static void ClampTo4PMColors(
             const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, SkPMColor[4]);
@@ skipping 18 matching lines @@
     #elif SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
         #include "../opts/SkPMFloat_SSE2.h"
     #elif defined(SK_ARM_HAS_NEON)
         #include "../opts/SkPMFloat_neon.h"
     #else
         #include "../opts/SkPMFloat_none.h"
     #endif
 #endif
 
 #endif//SkPM_DEFINED