libs/hwui/tests/unit/MatrixTests.cpp

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <gtest/gtest.h>

#include "Matrix.h"
#include "Rect.h"

using namespace android::uirenderer;

TEST(Matrix, mapRect_emptyScaleSkew) {
    // Skew, so we don't hit identity/translate/simple fast paths
    Matrix4 scaleMatrix;
    scaleMatrix.loadScale(10, 10, 1);
    scaleMatrix.skew(0.1f, 0.1f);

    // non-zero empty rect, so sorting x/y would make rect non-empty
    Rect empty(15, 20, 15, 100);
    ASSERT_TRUE(empty.isEmpty());
    scaleMatrix.mapRect(empty);
    EXPECT_EQ(Rect(170, 215, 250, 1015), empty);
    EXPECT_FALSE(empty.isEmpty())
        << "Empty 'line' rect doesn't remain empty when skewed.";
}

TEST(Matrix, mapRect_emptyRotate) {
    // Skew, so we don't hit identity/translate/simple fast paths
    Matrix4 skewMatrix;
    skewMatrix.loadRotate(45);

    // non-zero empty rect, so sorting x/y would make rect non-empty
    Rect lineRect(0, 100);
    ASSERT_TRUE(lineRect.isEmpty());
    skewMatrix.mapRect(lineRect);
    EXPECT_FALSE(lineRect.isEmpty())
        << "Empty 'line' rect doesn't remain empty when rotated.";
}