/*
 * Copyright (C) 2019 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.
 */

package com.android.server.wm.utils;

import static android.graphics.Bitmap.Config.ARGB_8888;

import static org.junit.Assert.assertEquals;

import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.ColorSpace;
import android.hardware.HardwareBuffer;
import android.platform.test.annotations.Presubmit;

import com.android.internal.policy.TransitionAnimation;

import org.junit.Test;

@Presubmit
public class RotationAnimationUtilsTest {

    private static final int BITMAP_HEIGHT = 100;
    private static final int BITMAP_WIDTH = 100;

    private ColorSpace mColorSpace = ColorSpace.get(ColorSpace.Named.DISPLAY_P3);

    @Test
    public void blackLuma() {
        Bitmap swBitmap = createBitmap(0);
        HardwareBuffer hb = swBitmapToHardwareBuffer(swBitmap);
        float borderLuma = TransitionAnimation.getBorderLuma(hb, mColorSpace);

        assertEquals(0, borderLuma, 0);
    }

    @Test
    public void whiteLuma() {
        Bitmap swBitmap = createBitmap(1);
        HardwareBuffer hb = swBitmapToHardwareBuffer(swBitmap);
        float borderLuma = TransitionAnimation.getBorderLuma(hb, mColorSpace);
        assertEquals(1, borderLuma, 0);
    }

    @Test
    public void unevenBitmapDimens() {
        Bitmap swBitmap = createBitmap(1, BITMAP_WIDTH + 1, BITMAP_HEIGHT + 1);
        HardwareBuffer hb = swBitmapToHardwareBuffer(swBitmap);
        float borderLuma = TransitionAnimation.getBorderLuma(hb, mColorSpace);
        assertEquals(1, borderLuma, 0);
    }

    @Test
    public void whiteImageBlackBorderLuma() {
        Bitmap swBitmap = createBitmap(1);
        setBorderLuma(swBitmap, 0);
        HardwareBuffer hb = swBitmapToHardwareBuffer(swBitmap);
        float borderLuma = TransitionAnimation.getBorderLuma(hb, mColorSpace);
        assertEquals(0, borderLuma, 0);
    }

    @Test
    public void blackImageWhiteBorderLuma() {
        Bitmap swBitmap = createBitmap(0);
        setBorderLuma(swBitmap, 1);
        HardwareBuffer hb = swBitmapToHardwareBuffer(swBitmap);
        float borderLuma = TransitionAnimation.getBorderLuma(hb, mColorSpace);
        assertEquals(1, borderLuma, 0);
    }

    private Bitmap createBitmap(float luma) {
        return createBitmap(luma, BITMAP_WIDTH, BITMAP_HEIGHT);
    }

    private Bitmap createBitmap(float luma, int width, int height) {
        Bitmap bitmap = Bitmap.createBitmap(width, height, ARGB_8888);
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                bitmap.setPixel(i, j, Color.argb(1, luma, luma, luma));
            }
        }
        return bitmap;
    }

    private HardwareBuffer swBitmapToHardwareBuffer(Bitmap swBitmap) {
        Bitmap hwBitmap = swBitmap.copy(Bitmap.Config.HARDWARE, false);
        return hwBitmap.getHardwareBuffer();
    }

    private void setBorderLuma(Bitmap swBitmap, float luma) {
        int i;
        int width = swBitmap.getWidth();
        int height = swBitmap.getHeight();
        for (i = 0; i < width; i++) {
            swBitmap.setPixel(i, 0, Color.argb(1, luma, luma, luma));
            swBitmap.setPixel(i, height - 1, Color.argb(1, luma, luma, luma));
        }
        for (i = 0; i < height; i++) {
            swBitmap.setPixel(0, i, Color.argb(1, luma, luma, luma));
            swBitmap.setPixel(width - 1, i, Color.argb(1, luma, luma, luma));
        }
    }
}