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// Copyright (c) 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 "ui/gfx/transform_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/point3_f.h"
#include "ui/gfx/geometry/rect.h"
namespace gfx {
namespace {
TEST(TransformUtilTest, GetScaleTransform) {
const Point kAnchor(20, 40);
const float kScale = 0.5f;
Transform scale = GetScaleTransform(kAnchor, kScale);
const int kOffset = 10;
for (int sign_x = -1; sign_x <= 1; ++sign_x) {
for (int sign_y = -1; sign_y <= 1; ++sign_y) {
Point test(kAnchor.x() + sign_x * kOffset,
kAnchor.y() + sign_y * kOffset);
scale.TransformPoint(&test);
EXPECT_EQ(Point(kAnchor.x() + sign_x * kOffset * kScale,
kAnchor.y() + sign_y * kOffset * kScale),
test);
}
}
}
TEST(TransformUtilTest, SnapRotation) {
Transform result(Transform::kSkipInitialization);
Transform transform;
transform.RotateAboutZAxis(89.99);
Rect viewport(1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_TRUE(snapped) << "Viewport should snap for this rotation.";
}
TEST(TransformUtilTest, SnapRotationDistantViewport) {
const int kOffset = 5000;
Transform result(Transform::kSkipInitialization);
Transform transform;
transform.RotateAboutZAxis(89.99);
Rect viewport(kOffset, kOffset, 1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_FALSE(snapped) << "Distant viewport shouldn't snap by more than 1px.";
}
TEST(TransformUtilTest, NoSnapRotation) {
Transform result(Transform::kSkipInitialization);
Transform transform;
const int kOffset = 5000;
transform.RotateAboutZAxis(89.9);
Rect viewport(kOffset, kOffset, 1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_FALSE(snapped) << "Viewport should not snap for this rotation.";
}
// Translations should always be snappable, the most we would move is 0.5
// pixels towards either direction to the nearest value in each component.
TEST(TransformUtilTest, SnapTranslation) {
Transform result(Transform::kSkipInitialization);
Transform transform;
transform.Translate3d(
SkDoubleToMScalar(1.01), SkDoubleToMScalar(1.99), SkDoubleToMScalar(3.0));
Rect viewport(1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_TRUE(snapped) << "Viewport should snap for this translation.";
}
TEST(TransformUtilTest, SnapTranslationDistantViewport) {
Transform result(Transform::kSkipInitialization);
Transform transform;
const int kOffset = 5000;
transform.Translate3d(
SkDoubleToMScalar(1.01), SkDoubleToMScalar(1.99), SkDoubleToMScalar(3.0));
Rect viewport(kOffset, kOffset, 1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_TRUE(snapped)
<< "Distant viewport should still snap by less than 1px.";
}
TEST(TransformUtilTest, SnapScale) {
Transform result(Transform::kSkipInitialization);
Transform transform;
transform.Scale3d(SkDoubleToMScalar(5.0),
SkDoubleToMScalar(2.00001),
SkDoubleToMScalar(1.0));
Rect viewport(1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_TRUE(snapped) << "Viewport should snap for this scaling.";
}
TEST(TransformUtilTest, NoSnapScale) {
Transform result(Transform::kSkipInitialization);
Transform transform;
transform.Scale3d(
SkDoubleToMScalar(5.0), SkDoubleToMScalar(2.1), SkDoubleToMScalar(1.0));
Rect viewport(1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_FALSE(snapped) << "Viewport shouldn't snap for this scaling.";
}
TEST(TransformUtilTest, SnapCompositeTransform) {
Transform result(Transform::kSkipInitialization);
Transform transform;
transform.Translate3d(SkDoubleToMScalar(30.5), SkDoubleToMScalar(20.0),
SkDoubleToMScalar(10.1));
transform.RotateAboutZAxis(89.99);
transform.Scale3d(SkDoubleToMScalar(1.0),
SkDoubleToMScalar(3.00001),
SkDoubleToMScalar(2.0));
Rect viewport(1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
ASSERT_TRUE(snapped) << "Viewport should snap all components.";
Point3F point;
point = Point3F(viewport.origin());
result.TransformPoint(&point);
EXPECT_EQ(Point3F(31.f, 20.f, 10.f), point) << "Transformed origin";
point = Point3F(viewport.top_right());
result.TransformPoint(&point);
EXPECT_EQ(Point3F(31.f, 1940.f, 10.f), point) << "Transformed top-right";
point = Point3F(viewport.bottom_left());
result.TransformPoint(&point);
EXPECT_EQ(Point3F(-3569.f, 20.f, 10.f), point) << "Transformed bottom-left";
point = Point3F(viewport.bottom_right());
result.TransformPoint(&point);
EXPECT_EQ(Point3F(-3569.f, 1940.f, 10.f), point)
<< "Transformed bottom-right";
}
TEST(TransformUtilTest, NoSnapSkewedCompositeTransform) {
Transform result(Transform::kSkipInitialization);
Transform transform;
transform.RotateAboutZAxis(89.99);
transform.Scale3d(SkDoubleToMScalar(1.0),
SkDoubleToMScalar(3.00001),
SkDoubleToMScalar(2.0));
transform.Translate3d(SkDoubleToMScalar(30.5), SkDoubleToMScalar(20.0),
SkDoubleToMScalar(10.1));
transform.SkewX(20.0);
Rect viewport(1920, 1200);
bool snapped = SnapTransform(&result, transform, viewport);
EXPECT_FALSE(snapped) << "Skewed viewport should not snap.";
}
TEST(TransformUtilTest, TransformAboutPivot) {
Transform transform;
transform.Scale(3, 4);
transform = TransformAboutPivot(Point(7, 8), transform);
Point point;
point = Point(0, 0);
transform.TransformPoint(&point);
EXPECT_EQ(Point(-14, -24).ToString(), point.ToString());
point = Point(1, 1);
transform.TransformPoint(&point);
EXPECT_EQ(Point(-11, -20).ToString(), point.ToString());
}
} // namespace
} // namespace gfx
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