SkPMFloat::trunc()

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 39 matching lines @@
 
     float a() const { return fColor[SK_A32_SHIFT / 8]; }
     float r() const { return fColor[SK_R32_SHIFT / 8]; }
     float g() const { return fColor[SK_G32_SHIFT / 8]; }
     float b() const { return fColor[SK_B32_SHIFT / 8]; }
 
     // 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().
 
+    // Like get(), but truncates instead of rounding.

[reed1, 2015/03/26 13:05:10]

floor or (int) ?
i.e. can you document what happens to negative values?

[mtklein, 2015/03/26 13:26:25]

Done.

// 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]);
 
     bool isValid() const {
         return this->a() >= 0 && this->a() <= 255
             && this->r() >= 0 && this->r() <= this->a()
             && this->g() >= 0 && this->g() <= this->a()
@@ skipping 15 matching lines @@
     #include "../opts/SkPMFloat_SSSE3.h"
 #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//SkPM_DEFINED