SkPMFloat::trunc()

tests/PMFloatTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPMFloat.h"
 #include "Test.h"
 
 DEF_TEST(SkPMFloat, r) {
     // Test SkPMColor <-> SkPMFloat
     SkPMColor c = SkPreMultiplyColor(0xFFCC9933);
     SkPMFloat pmf(c);
     REPORTER_ASSERT(r, SkScalarNearlyEqual(255.0f, pmf.a()));
     REPORTER_ASSERT(r, SkScalarNearlyEqual(204.0f, pmf.r()));
     REPORTER_ASSERT(r, SkScalarNearlyEqual(153.0f, pmf.g()));
     REPORTER_ASSERT(r, SkScalarNearlyEqual( 51.0f, pmf.b()));
     REPORTER_ASSERT(r, c == pmf.get());
 
     // Test rounding.
     pmf = SkPMFloat(254.5f, 203.5f, 153.1f, 50.8f);
     REPORTER_ASSERT(r, c == pmf.get());
 
+    pmf = SkPMFloat(255.9f, 204.01f, 153.0f, -0.9f);
+    REPORTER_ASSERT(r, SkPreMultiplyColor(0xFFCC9900) == pmf.trunc());
+
     // Test clamping.
     SkPMFloat clamped(SkPMFloat(510.0f, 153.0f, 1.0f, -0.2f).clamped());
     REPORTER_ASSERT(r, SkScalarNearlyEqual(255.0f, clamped.a()));
     REPORTER_ASSERT(r, SkScalarNearlyEqual(153.0f, clamped.r()));
     REPORTER_ASSERT(r, SkScalarNearlyEqual(  1.0f, clamped.g()));
     REPORTER_ASSERT(r, SkScalarNearlyEqual(  0.0f, clamped.b()));
 
     // Test SkPMFloat <-> Sk4f conversion.
     Sk4f fs = clamped;
     SkPMFloat scaled = fs * Sk4f(0.25f);
@@ skipping 11 matching lines @@
     SkPMFloat::To4PMColors(floats[0], floats[1], floats[2], floats[3], back);
     for (int i = 0; i < 4; i++) {
         REPORTER_ASSERT(r, back[i] == colors[i]);
     }
 
     SkPMFloat::ClampTo4PMColors(floats[0], floats[1], floats[2], floats[3], back);
     for (int i = 0; i < 4; i++) {
         REPORTER_ASSERT(r, back[i] == colors[i]);
     }
 }