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// Copyright 2013 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 "ui/compositor/transform_animation_curve_adapter.h"
#include <sstream>
#include "base/time/time.h"
#include "cc/base/time_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/compositor/test/test_utils.h"
namespace ui {
namespace {
// Check that the inverse transform curve gives the gives a transform that when
// applied on top of the parent transform gives the original transform
TEST(InverseTransformCurveAdapterTest, InversesTransform) {
gfx::Transform parent_start, parent_target;
parent_start.Scale(0.5, 3.0);
parent_start.Translate(-20.0, 30.0);
parent_target.Translate(0, 100);
gfx::Transform child_transform;
child_transform.Rotate(-30.0);
base::TimeDelta duration = base::TimeDelta::FromSeconds(1);
const gfx::Transform effective_child_transform =
parent_start * child_transform;
TransformAnimationCurveAdapter parent_curve(gfx::Tween::LINEAR,
parent_start,
parent_target,
duration);
InverseTransformCurveAdapter child_curve(parent_curve,
child_transform,
duration);
static const int kSteps = 1000;
double step = 1.0 / kSteps;
for (int i = 0; i <= kSteps ; ++i) {
base::TimeDelta time_step = cc::TimeUtil::Scale(duration, i * step);
std::ostringstream message;
message << "Step " << i << " of " << kSteps;
SCOPED_TRACE(message.str());
gfx::Transform progress_parent_transform = parent_curve.GetValue(time_step);
gfx::Transform progress_child_transform = child_curve.GetValue(time_step);
CheckApproximatelyEqual(effective_child_transform,
progress_parent_transform *
progress_child_transform);
}
}
} // namespace
} // namespace ui
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