Motown: Rename Ratio and LinearFunction classes

services/media/common/test/timeline_function_test.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/services/media/common/cpp/timeline_function.h"
+#include "services/media/common/test/test_base.h"
+
+namespace mojo {
+namespace media {
+namespace {
+
+class TimelineFunctionTest : public TestBase {
+ public:
+  // Verifies that a TimelineFunction instantiated in three different ways with
+  // the given arguments has the expected properties.
+  void VerifyBasics(int64_t reference_time,
+                    int64_t subject_time,
+                    uint32_t reference_delta,
+                    uint32_t subject_delta) {
+    TimelineFunction under_test_1(reference_time, subject_time, reference_delta,
+                                  subject_delta);
+    VerifyBasics(under_test_1, reference_time, subject_time, reference_delta,
+                 subject_delta);
+
+    TimelineFunction under_test_2(reference_time, subject_time,
+                                  TimelineRate(subject_delta, reference_delta));
+    VerifyBasics(under_test_2, reference_time, subject_time, reference_delta,
+                 subject_delta);
+
+    TimelineFunction under_test_3(TimelineRate(subject_delta, reference_delta));
+    VerifyBasics(under_test_3, 0, 0, reference_delta, subject_delta);
+
+    EXPECT_EQ(under_test_1, under_test_1);
+    EXPECT_EQ(under_test_1, under_test_2);
+    EXPECT_EQ(under_test_2, under_test_1);
+    EXPECT_EQ(under_test_2, under_test_2);
+
+    if (reference_time == 0 && subject_time == 0) {
+      EXPECT_EQ(under_test_1, under_test_3);
+      EXPECT_EQ(under_test_2, under_test_3);
+      EXPECT_EQ(under_test_3, under_test_1);
+      EXPECT_EQ(under_test_3, under_test_2);
+    } else {
+      EXPECT_NE(under_test_1, under_test_3);
+      EXPECT_NE(under_test_2, under_test_3);
+      EXPECT_NE(under_test_3, under_test_1);
+      EXPECT_NE(under_test_3, under_test_2);
+    }
+  }
+
+  // Verifies that the given TimelineFunction instantiated with the given
+  // arguments has the expected properties.
+  void VerifyBasics(const TimelineFunction& under_test,
+                    int64_t reference_time,
+                    int64_t subject_time,
+                    uint32_t reference_delta,
+                    uint32_t subject_delta) {
+    TimelineRate::Reduce(&subject_delta, &reference_delta);
+    EXPECT_EQ(reference_time, under_test.reference_time());
+    EXPECT_EQ(subject_time, under_test.subject_time());
+    EXPECT_EQ(reference_delta, under_test.reference_delta());
+    EXPECT_EQ(subject_delta, under_test.subject_delta());
+    EXPECT_EQ(reference_delta, under_test.rate().reference_delta());
+    EXPECT_EQ(subject_delta, under_test.rate().subject_delta());
+  }
+
+  // Verifies that the inverse of a TimelineFunction instantiated in three
+  // different ways with the given arguments has the expected properties.
+  void VerifyInverse(int64_t reference_time,
+                     int64_t subject_time,
+                     uint32_t reference_delta,
+                     uint32_t subject_delta) {
+    TimelineFunction under_test_1(reference_time, subject_time, reference_delta,
+                                  subject_delta);
+    VerifyBasics(under_test_1.Inverse(), subject_time, reference_time,
+                 subject_delta, reference_delta);
+
+    TimelineFunction under_test_2(reference_time, subject_time,
+                                  TimelineRate(subject_delta, reference_delta));
+    VerifyBasics(under_test_2.Inverse(), subject_time, reference_time,
+                 subject_delta, reference_delta);
+
+    TimelineFunction under_test_3(TimelineRate(subject_delta, reference_delta));
+    VerifyBasics(under_test_3.Inverse(), 0, 0, subject_delta, reference_delta);
+  }
+
+  // Verifies that TimelineFunction::Apply, in its various forms, works as
+  // expected for the given arguments.
+  void VerifyApply(int64_t reference_time,
+                   int64_t subject_time,
+                   uint32_t reference_delta,
+                   uint32_t subject_delta,
+                   int64_t reference_input,
+                   int64_t expected_result) {
+    // Verify the static method.
+    EXPECT_EQ(expected_result, TimelineFunction::Apply(
+                                   reference_time, subject_time,
+                                   TimelineRate(subject_delta, reference_delta),
+                                   reference_input));
+
+    // Verify the instance method.
+    TimelineFunction under_test(reference_time, subject_time, reference_delta,
+                                subject_delta);
+    EXPECT_EQ(expected_result, under_test.Apply(reference_input));
+
+    // Verify the operator.
+    EXPECT_EQ(expected_result, under_test(reference_input));
+  }
+
+  // Verifies that TimelineFunction::ApplyInverse, in its various forms, works
+  // as
+  // expected for the given arguments.
+  void VerifyApplyInverse(int64_t reference_time,
+                          int64_t subject_time,
+                          uint32_t reference_delta,
+                          uint32_t subject_delta,
+                          int64_t subject_input,
+                          int64_t expected_result) {
+    // Verify the static method.
+    EXPECT_EQ(expected_result,
+              TimelineFunction::ApplyInverse(
+                  reference_time, subject_time,
+                  TimelineRate(subject_delta, reference_delta), subject_input));
+
+    // Verify the instance method.
+    TimelineFunction under_test(reference_time, subject_time, reference_delta,
+                                subject_delta);
+    EXPECT_EQ(expected_result, under_test.ApplyInverse(subject_input));
+  }
+
+  // Verifies that TimelineFunction::Compose works as expected with the given
+  // inputs.
+  void VerifyCompose(const TimelineFunction& a,
+                     const TimelineFunction& b,
+                     bool exact,
+                     const TimelineFunction& expected_result) {
+    // Verify the static method.
+    EXPECT_EQ(expected_result, TimelineFunction::Compose(a, b, exact));
+  }
+};
+
+// Tests TimelineFunction basics for various instantiation arguments.
+TEST_F(TimelineFunctionTest, Basics) {
+  VerifyBasics(0, 0, 1, 0);
+  VerifyBasics(0, 0, 1, 1);
+  VerifyBasics(1, 1, 10, 10);
+  VerifyBasics(1234, 5678, 4321, 8765);
+  VerifyBasics(-1234, 5678, 4321, 8765);
+  VerifyBasics(-1234, -5678, 4321, 8765);
+  VerifyBasics(1234, -5678, 4321, 8765);
+}
+
+// Tests TimelineFunction::Inverse.
+TEST_F(TimelineFunctionTest, Inverse) {
+  VerifyInverse(0, 0, 1, 1);
+  VerifyInverse(1, 1, 10, 10);
+  VerifyInverse(1234, 5678, 4321, 8765);
+  VerifyInverse(-1234, 5678, 4321, 8765);
+  VerifyInverse(-1234, -5678, 4321, 8765);
+  VerifyInverse(1234, -5678, 4321, 8765);
+}
+
+// Tests TimelineFunction::Apply in its variations.
+TEST_F(TimelineFunctionTest, Apply) {
+  VerifyApply(0, 0, 1, 0, 0, 0);
+  VerifyApply(0, 0, 1, 0, 1000, 0);
+  VerifyApply(0, 1234, 1, 0, 0, 1234);
+  VerifyApply(0, 1234, 1, 0, 1000, 1234);
+  VerifyApply(0, 1234, 1, 0, -1000, 1234);
+  VerifyApply(0, -1234, 1, 0, 0, -1234);
+  VerifyApply(0, -1234, 1, 0, 1000, -1234);
+  VerifyApply(0, -1234, 1, 0, -1000, -1234);
+  VerifyApply(0, 0, 1, 1, 0, 0);
+  VerifyApply(0, 0, 1, 1, 1000, 1000);
+  VerifyApply(0, 1234, 1, 1, 0, 1234);
+  VerifyApply(0, 1234, 1, 1, 1000, 2234);
+  VerifyApply(0, 1234, 1, 1, -1000, 234);
+  VerifyApply(0, -1234, 1, 1, 0, -1234);
+  VerifyApply(0, -1234, 1, 1, 1000, -234);
+  VerifyApply(0, -1234, 1, 1, -1000, -2234);
+  VerifyApply(10, 0, 1, 0, 0, 0);
+  VerifyApply(10, 0, 1, 1, 0, -10);
+  VerifyApply(-10, 0, 1, 0, 0, 0);
+  VerifyApply(-10, 0, 1, 1, 0, 10);
+  VerifyApply(0, 1234, 2, 1, 0, 1234);
+  VerifyApply(0, 1234, 2, 1, 1234, 1234 + 1234 / 2);
+  VerifyApply(0, 1234, 1, 2, 1234, 1234 + 1234 * 2);
+}
+
+// Tests TimelineFunction::Apply in its variations.
+TEST_F(TimelineFunctionTest, ApplyInverse) {
+  VerifyApplyInverse(0, 0, 1, 1, 0, 0);
+  VerifyApplyInverse(0, 0, 1, 1, 1000, 1000);
+  VerifyApplyInverse(0, 1234, 1, 1, 1234, 0);
+  VerifyApplyInverse(0, 1234, 1, 1, 2234, 1000);
+  VerifyApplyInverse(0, 1234, 1, 1, 234, -1000);
+  VerifyApplyInverse(0, -1234, 1, 1, -1234, 0);
+  VerifyApplyInverse(0, -1234, 1, 1, -234, 1000);
+  VerifyApplyInverse(0, -1234, 1, 1, -2234, -1000);
+  VerifyApplyInverse(10, 0, 1, 1, -10, 0);
+  VerifyApplyInverse(-10, 0, 1, 1, 10, 0);
+  VerifyApplyInverse(0, 1234, 2, 1, 1234, 0);
+  VerifyApplyInverse(0, 1234, 2, 1, 1234 + 1234 / 2, 1234);
+  VerifyApplyInverse(0, 1234, 1, 2, 1234 + 1234 * 2, 1234);
+}
+
+// Tests TimelineFunction::Compose.
+TEST_F(TimelineFunctionTest, Compose) {
+  VerifyCompose(TimelineFunction(0, 0, 1, 0), TimelineFunction(0, 0, 1, 0),
+                true, TimelineFunction(0, 0, 1, 0));
+  VerifyCompose(TimelineFunction(0, 0, 1, 1), TimelineFunction(0, 0, 1, 1),
+                true, TimelineFunction(0, 0, 1, 1));
+  VerifyCompose(TimelineFunction(1, 0, 1, 1), TimelineFunction(0, 0, 1, 1),
+                true, TimelineFunction(0, -1, 1, 1));
+  VerifyCompose(TimelineFunction(10, 10, 1, 1), TimelineFunction(0, 0, 1, 1),
+                true, TimelineFunction(0, 0, 1, 1));
+  VerifyCompose(TimelineFunction(0, 0, 1, 2), TimelineFunction(0, 0, 1, 2),
+                true, TimelineFunction(0, 0, 1, 4));
+  VerifyCompose(TimelineFunction(0, 0, 2, 1), TimelineFunction(0, 0, 2, 1),
+                true, TimelineFunction(0, 0, 4, 1));
+  VerifyCompose(TimelineFunction(0, 0, 2, 1), TimelineFunction(0, 0, 1, 2),
+                true, TimelineFunction(0, 0, 1, 1));
+}
+
+}  // namespace
+}  // namespace media
+}  // namespace mojo