Fix step timing outside range [0,1]

third_party/WebKit/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 397 matching lines @@
   EXPECT_NEAR(0.034, cubic_custom_timing->Evaluate(0.25, tolerance), tolerance);
   EXPECT_NEAR(-0.217, cubic_custom_timing->Evaluate(0.50, tolerance),
               tolerance);
   EXPECT_NEAR(-0.335, cubic_custom_timing->Evaluate(0.75, tolerance),
               tolerance);
 }
 
 TEST_F(TimingFunctionTest, StepsEvaluate) {
   RefPtr<TimingFunction> steps_timing_start =
       StepsTimingFunction::Preset(StepsTimingFunction::StepPosition::START);
-  EXPECT_EQ(0.00, steps_timing_start->Evaluate(-1.10, 0));
+  EXPECT_EQ(-1.00, steps_timing_start->Evaluate(-1.10, 0));
   EXPECT_EQ(0.00, steps_timing_start->Evaluate(-0.10, 0));
   EXPECT_EQ(1.00, steps_timing_start->Evaluate(0.00, 0));
   EXPECT_EQ(1.00, steps_timing_start->Evaluate(0.20, 0));
   EXPECT_EQ(1.00, steps_timing_start->Evaluate(0.60, 0));
   EXPECT_EQ(1.00, steps_timing_start->Evaluate(1.00, 0));
-  EXPECT_EQ(1.00, steps_timing_start->Evaluate(2.00, 0));
+  EXPECT_EQ(3.00, steps_timing_start->Evaluate(2.00, 0));
 
   RefPtr<TimingFunction> steps_timing_middle =
       StepsTimingFunction::Preset(StepsTimingFunction::StepPosition::MIDDLE);
-  EXPECT_EQ(0.00, steps_timing_middle->Evaluate(-2.50, 0));
+  EXPECT_EQ(-2.00, steps_timing_middle->Evaluate(-2.50, 0));
   EXPECT_EQ(0.00, steps_timing_middle->Evaluate(0.00, 0));
   EXPECT_EQ(0.00, steps_timing_middle->Evaluate(0.49, 0));
   EXPECT_EQ(1.00, steps_timing_middle->Evaluate(0.50, 0));
   EXPECT_EQ(1.00, steps_timing_middle->Evaluate(1.00, 0));
-  EXPECT_EQ(1.00, steps_timing_middle->Evaluate(2.50, 0));
+  EXPECT_EQ(3.00, steps_timing_middle->Evaluate(2.50, 0));
 
   RefPtr<TimingFunction> steps_timing_end =
       StepsTimingFunction::Preset(StepsTimingFunction::StepPosition::END);
-  EXPECT_EQ(0.00, steps_timing_end->Evaluate(-2.00, 0));
+  EXPECT_EQ(-2.00, steps_timing_end->Evaluate(-2.00, 0));
   EXPECT_EQ(0.00, steps_timing_end->Evaluate(0.00, 0));
   EXPECT_EQ(0.00, steps_timing_end->Evaluate(0.20, 0));
   EXPECT_EQ(0.00, steps_timing_end->Evaluate(0.60, 0));
   EXPECT_EQ(1.00, steps_timing_end->Evaluate(1.00, 0));
-  EXPECT_EQ(1.00, steps_timing_end->Evaluate(2.00, 0));
+  EXPECT_EQ(2.00, steps_timing_end->Evaluate(2.00, 0));
 
   RefPtr<TimingFunction> steps_timing_custom_start =
       StepsTimingFunction::Create(4, StepsTimingFunction::StepPosition::START);
-  EXPECT_EQ(0.00, steps_timing_custom_start->Evaluate(-0.50, 0));
+  EXPECT_EQ(-0.25, steps_timing_custom_start->Evaluate(-0.50, 0));
   EXPECT_EQ(0.25, steps_timing_custom_start->Evaluate(0.00, 0));
   EXPECT_EQ(0.25, steps_timing_custom_start->Evaluate(0.24, 0));
   EXPECT_EQ(0.50, steps_timing_custom_start->Evaluate(0.25, 0));
   EXPECT_EQ(0.50, steps_timing_custom_start->Evaluate(0.49, 0));
   EXPECT_EQ(0.75, steps_timing_custom_start->Evaluate(0.50, 0));
   EXPECT_EQ(0.75, steps_timing_custom_start->Evaluate(0.74, 0));
   EXPECT_EQ(1.00, steps_timing_custom_start->Evaluate(0.75, 0));
   EXPECT_EQ(1.00, steps_timing_custom_start->Evaluate(1.00, 0));
-  EXPECT_EQ(1.00, steps_timing_custom_start->Evaluate(1.50, 0));
+  EXPECT_EQ(1.75, steps_timing_custom_start->Evaluate(1.50, 0));
 
   RefPtr<TimingFunction> steps_timing_custom_middle =
       StepsTimingFunction::Create(4, StepsTimingFunction::StepPosition::MIDDLE);
-  EXPECT_EQ(0.00, steps_timing_custom_middle->Evaluate(-2.00, 0));
+  EXPECT_EQ(-2.00, steps_timing_custom_middle->Evaluate(-2.00, 0));
   EXPECT_EQ(0.00, steps_timing_custom_middle->Evaluate(0.00, 0));
   EXPECT_EQ(0.00, steps_timing_custom_middle->Evaluate(0.12, 0));
   EXPECT_EQ(0.25, steps_timing_custom_middle->Evaluate(0.13, 0));
   EXPECT_EQ(0.25, steps_timing_custom_middle->Evaluate(0.37, 0));
   EXPECT_EQ(0.50, steps_timing_custom_middle->Evaluate(0.38, 0));
   EXPECT_EQ(0.50, steps_timing_custom_middle->Evaluate(0.62, 0));
   EXPECT_EQ(0.75, steps_timing_custom_middle->Evaluate(0.63, 0));
   EXPECT_EQ(0.75, steps_timing_custom_middle->Evaluate(0.87, 0));
   EXPECT_EQ(1.00, steps_timing_custom_middle->Evaluate(0.88, 0));
   EXPECT_EQ(1.00, steps_timing_custom_middle->Evaluate(1.00, 0));
-  EXPECT_EQ(1.00, steps_timing_custom_middle->Evaluate(3.00, 0));
+  EXPECT_EQ(3.00, steps_timing_custom_middle->Evaluate(3.00, 0));
 
   RefPtr<TimingFunction> steps_timing_custom_end =
       StepsTimingFunction::Create(4, StepsTimingFunction::StepPosition::END);
-  EXPECT_EQ(0.00, steps_timing_custom_end->Evaluate(-2.00, 0));
+  EXPECT_EQ(-2.00, steps_timing_custom_end->Evaluate(-2.00, 0));
   EXPECT_EQ(0.00, steps_timing_custom_end->Evaluate(0.00, 0));
   EXPECT_EQ(0.00, steps_timing_custom_end->Evaluate(0.24, 0));
   EXPECT_EQ(0.25, steps_timing_custom_end->Evaluate(0.25, 0));
   EXPECT_EQ(0.25, steps_timing_custom_end->Evaluate(0.49, 0));
   EXPECT_EQ(0.50, steps_timing_custom_end->Evaluate(0.50, 0));
   EXPECT_EQ(0.50, steps_timing_custom_end->Evaluate(0.74, 0));
   EXPECT_EQ(0.75, steps_timing_custom_end->Evaluate(0.75, 0));
   EXPECT_EQ(0.75, steps_timing_custom_end->Evaluate(0.99, 0));
   EXPECT_EQ(1.00, steps_timing_custom_end->Evaluate(1.00, 0));
-  EXPECT_EQ(1.00, steps_timing_custom_end->Evaluate(2.00, 0));
+  EXPECT_EQ(2.00, steps_timing_custom_end->Evaluate(2.00, 0));
 }
 
 }  // namespace
 
 }  // namespace blink