Web Animations: Allow timing inputs outside the range [0, 1]

Source/platform/animation/TimingFunctionTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 200 matching lines @@
     RefPtr<TimingFunction> stepsB = StepsTimingFunction::create(1, StepsTimingFunction::StepAtStart);
     EXPECT_NE(*stepsA, *stepsB);
     EXPECT_NE(*stepsB, *stepsA);
 }
 
 TEST_F(TimingFunctionTest, LinearEvaluate)
 {
     RefPtr<TimingFunction> linearTiming = LinearTimingFunction::preset();
     EXPECT_EQ(0.2, linearTiming->evaluate(0.2, 0));
     EXPECT_EQ(0.6, linearTiming->evaluate(0.6, 0));
+    EXPECT_EQ(-0.2, linearTiming->evaluate(-0.2, 0));
+    EXPECT_EQ(1.6, linearTiming->evaluate(1.6, 0));
 }
 
 TEST_F(TimingFunctionTest, CubicEvaluate)
 {
     double tolerance = 0.01;
     RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
     EXPECT_NEAR(0.418, cubicEaseTiming->evaluate(0.25, tolerance), tolerance);
     EXPECT_NEAR(0.805, cubicEaseTiming->evaluate(0.50, tolerance), tolerance);
     EXPECT_NEAR(0.960, cubicEaseTiming->evaluate(0.75, tolerance), tolerance);
 
@@ skipping 14 matching lines @@
 
     RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
     EXPECT_NEAR(0.034, cubicCustomTiming->evaluate(0.25, tolerance), tolerance);
     EXPECT_NEAR(-0.217, cubicCustomTiming->evaluate(0.50, tolerance), tolerance);
     EXPECT_NEAR(-0.335, cubicCustomTiming->evaluate(0.75, tolerance), tolerance);
 }
 
 TEST_F(TimingFunctionTest, StepsEvaluate)
 {
     RefPtr<TimingFunction> stepsTimingStart = StepsTimingFunction::preset(StepsTimingFunction::Start);
+    EXPECT_EQ(0.00, stepsTimingStart->evaluate(-1.10, 0));
+    EXPECT_EQ(0.00, stepsTimingStart->evaluate(-0.10, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.00, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.20, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.60, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(1.00, 0));
+    EXPECT_EQ(1.00, stepsTimingStart->evaluate(2.00, 0));
 
     RefPtr<TimingFunction> stepsTimingMiddle = StepsTimingFunction::preset(StepsTimingFunction::Middle);
+    EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(-2.50, 0));
     EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.49, 0));
     EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(0.50, 0));
     EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(1.00, 0));
+    EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(2.50, 0));
 
     RefPtr<TimingFunction> stepsTimingEnd = StepsTimingFunction::preset(StepsTimingFunction::End);
+    EXPECT_EQ(0.00, stepsTimingEnd->evaluate(-2.00, 0));
     EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.20, 0));
     EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.60, 0));
     EXPECT_EQ(1.00, stepsTimingEnd->evaluate(1.00, 0));
+    EXPECT_EQ(1.00, stepsTimingEnd->evaluate(2.00, 0));
 
     RefPtr<TimingFunction> stepsTimingCustomStart = StepsTimingFunction::create(4, StepsTimingFunction::StepAtStart);
+    EXPECT_EQ(0.00, stepsTimingCustomStart->evaluate(-0.50, 0));
     EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.00, 0));
     EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.24, 0));
     EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.25, 0));
     EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.49, 0));
     EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.50, 0));
     EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.74, 0));
     EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(0.75, 0));
     EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(1.00, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(1.50, 0));
 
     RefPtr<TimingFunction> stepsTimingCustomMiddle = StepsTimingFunction::create(4, StepsTimingFunction::StepAtMiddle);
+    EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(-2.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.12, 0));
     EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.13, 0));
     EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.37, 0));
     EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.38, 0));
     EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.62, 0));
     EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.63, 0));
     EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.87, 0));
     EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(0.88, 0));
     EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(1.00, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(3.00, 0));
 
     RefPtr<TimingFunction> stepsTimingCustomEnd = StepsTimingFunction::create(4, StepsTimingFunction::StepAtEnd);
+    EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(-2.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.24, 0));
     EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.25, 0));
     EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.49, 0));
     EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.50, 0));
     EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.74, 0));
     EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.75, 0));
     EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.99, 0));
     EXPECT_EQ(1.00, stepsTimingCustomEnd->evaluate(1.00, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomEnd->evaluate(2.00, 0));
 }
 
 } // namespace
 
 } // namespace WebCore