Part 1 of cc/ directory shuffles: base

cc/math_util_unittest.cc

-// Copyright 2012 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 "cc/math_util.h"
-
-#include <cmath>
-
-#include "cc/test/geometry_test_utils.h"
-#include "testing/gmock/include/gmock/gmock.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "ui/gfx/rect.h"
-#include "ui/gfx/rect_f.h"
-#include "ui/gfx/transform.h"
-
-namespace cc {
-namespace {
-
-TEST(MathUtilTest, verifyProjectionOfPerpendicularPlane)
-{
-    // In this case, the m33() element of the transform becomes zero, which could cause a
-    // divide-by-zero when projecting points/quads.
-
-    gfx::Transform transform;
-    transform.MakeIdentity();
-    transform.matrix().setDouble(2, 2, 0);
-
-    gfx::RectF rect = gfx::RectF(0, 0, 1, 1);
-    gfx::RectF projectedRect = MathUtil::projectClippedRect(transform, rect);
-
-    EXPECT_EQ(0, projectedRect.x());
-    EXPECT_EQ(0, projectedRect.y());
-    EXPECT_TRUE(projectedRect.IsEmpty());
-}
-
-TEST(MathUtilTest, verifyEnclosingClippedRectUsesCorrectInitialBounds)
-{
-    HomogeneousCoordinate h1(-100, -100, 0, 1);
-    HomogeneousCoordinate h2(-10, -10, 0, 1);
-    HomogeneousCoordinate h3(10, 10, 0, -1);
-    HomogeneousCoordinate h4(100, 100, 0, -1);
-
-    // The bounds of the enclosing clipped rect should be -100 to -10 for both x and y.
-    // However, if there is a bug where the initial xmin/xmax/ymin/ymax are initialized to
-    // numeric_limits<float>::min() (which is zero, not -flt_max) then the enclosing
-    // clipped rect will be computed incorrectly.
-    gfx::RectF result = MathUtil::computeEnclosingClippedRect(h1, h2, h3, h4);
-
-    EXPECT_FLOAT_RECT_EQ(gfx::RectF(gfx::PointF(-100, -100), gfx::SizeF(90, 90)), result);
-}
-
-TEST(MathUtilTest, verifyEnclosingRectOfVerticesUsesCorrectInitialBounds)
-{
-    gfx::PointF vertices[3];
-    int numVertices = 3;
-
-    vertices[0] = gfx::PointF(-10, -100);
-    vertices[1] = gfx::PointF(-100, -10);
-    vertices[2] = gfx::PointF(-30, -30);
-
-    // The bounds of the enclosing rect should be -100 to -10 for both x and y. However,
-    // if there is a bug where the initial xmin/xmax/ymin/ymax are initialized to
-    // numeric_limits<float>::min() (which is zero, not -flt_max) then the enclosing
-    // clipped rect will be computed incorrectly.
-    gfx::RectF result = MathUtil::computeEnclosingRectOfVertices(vertices, numVertices);
-
-    EXPECT_FLOAT_RECT_EQ(gfx::RectF(gfx::PointF(-100, -100), gfx::SizeF(90, 90)), result);
-}
-
-TEST(MathUtilTest, smallestAngleBetweenVectors)
-{
-    gfx::Vector2dF x(1, 0);
-    gfx::Vector2dF y(0, 1);
-    gfx::Vector2dF testVector(0.5, 0.5);
-
-    // Orthogonal vectors are at an angle of 90 degress.
-    EXPECT_EQ(90, MathUtil::smallestAngleBetweenVectors(x, y));
-
-    // A vector makes a zero angle with itself.
-    EXPECT_EQ(0, MathUtil::smallestAngleBetweenVectors(x, x));
-    EXPECT_EQ(0, MathUtil::smallestAngleBetweenVectors(y, y));
-    EXPECT_EQ(0, MathUtil::smallestAngleBetweenVectors(testVector, testVector));
-
-    // Parallel but reversed vectors are at 180 degrees.
-    EXPECT_FLOAT_EQ(180, MathUtil::smallestAngleBetweenVectors(x, -x));
-    EXPECT_FLOAT_EQ(180, MathUtil::smallestAngleBetweenVectors(y, -y));
-    EXPECT_FLOAT_EQ(180, MathUtil::smallestAngleBetweenVectors(testVector, -testVector));
-
-    // The test vector is at a known angle.
-    EXPECT_FLOAT_EQ(45, std::floor(MathUtil::smallestAngleBetweenVectors(testVector, x)));
-    EXPECT_FLOAT_EQ(45, std::floor(MathUtil::smallestAngleBetweenVectors(testVector, y)));
-}
-
-TEST(MathUtilTest, vectorProjection)
-{
-    gfx::Vector2dF x(1, 0);
-    gfx::Vector2dF y(0, 1);
-    gfx::Vector2dF testVector(0.3f, 0.7f);
-
-    // Orthogonal vectors project to a zero vector.
-    EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 0), MathUtil::projectVector(x, y));
-    EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 0), MathUtil::projectVector(y, x));
-
-    // Projecting a vector onto the orthonormal basis gives the corresponding component of the
-    // vector.
-    EXPECT_VECTOR_EQ(gfx::Vector2dF(testVector.x(), 0), MathUtil::projectVector(testVector, x));
-    EXPECT_VECTOR_EQ(gfx::Vector2dF(0, testVector.y()), MathUtil::projectVector(testVector, y));
-
-    // Finally check than an arbitrary vector projected to another one gives a vector parallel to
-    // the second vector.
-    gfx::Vector2dF targetVector(0.5, 0.2f);
-    gfx::Vector2dF projectedVector = MathUtil::projectVector(testVector, targetVector);
-    EXPECT_EQ(projectedVector.x() / targetVector.x(),
-              projectedVector.y() / targetVector.y());
-}
-
-}  // namespace
-}  // namespace cc