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/*
* Copyright (C) 2020 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.cts.mockime;
import android.graphics.Bitmap;
import android.graphics.Color;
import androidx.annotation.AnyThread;
import androidx.annotation.NonNull;
/**
* A utility class to put a unique image on {@link MockIme} so that whether the software keyboard is
* visible to the user or not can be determined from the screenshot.
*/
public final class Watermark {
/**
* Tolerance level between the expected color and the actual color in each color channel.
*
* <p>See Bug 174534092 about why we ended up having this.</p>
*/
private static final int TOLERANCE = 4;
/**
* A utility class that represents A8R8G8B bitmap as an integer array.
*/
private static final class BitmapImage {
@NonNull
private final int[] mPixels;
private final int mWidth;
private final int mHeight;
BitmapImage(@NonNull int[] pixels, int width, int height) {
mWidth = width;
mHeight = height;
mPixels = pixels;
}
/**
* Create {@link BitmapImage} from {@link Bitmap}.
*
* @param bitmap {@link Bitmap} from which {@link BitmapImage} will be created.
* @return A new instance of {@link BitmapImage}.
*/
@AnyThread
static BitmapImage createFromBitmap(@NonNull Bitmap bitmap) {
final int width = bitmap.getWidth();
final int height = bitmap.getHeight();
final int[] pixels = new int[width * height];
bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
return new BitmapImage(pixels, width, height);
}
/**
* @return Width of this image.
*/
@AnyThread
int getWidth() {
return mWidth;
}
/**
* @return Height of this image.
*/
@AnyThread
int getHeight() {
return mHeight;
}
/**
* @return {@link Bitmap} that has the same pixel patterns.
*/
@AnyThread
@NonNull
Bitmap toBitmap() {
return Bitmap.createBitmap(mPixels, mWidth, mHeight, Bitmap.Config.ARGB_8888);
}
/**
* Checks if the same image can be found in the specified {@link BitmapImage} within
* within {@link #TOLERANCE}.
*
* @param targetImage {@link BitmapImage} to be checked.
* @param offsetX X offset in the {@code targetImage} used when comparing.
* @param offsetY Y offset in the {@code targetImage} used when comparing.
* @return {@true} if two given images are the same within {@link #TOLERANCE}.
*/
@AnyThread
boolean robustMatch(@NonNull BitmapImage targetImage, int offsetX, int offsetY) {
final int targetWidth = targetImage.getWidth();
final int targetHeight = targetImage.getHeight();
final int[] targetPixels = targetImage.mPixels;
final int[] sourcePixels = mPixels;
if (offsetX < 0 || targetWidth <= mWidth - 1 + offsetX) return false;
if (offsetY < 0 || targetHeight <= mHeight - 1 + offsetY) return false;
for (int y = 0; y < mHeight; ++y) {
for (int x = 0; x < mWidth; ++x) {
final int targetX = x + offsetX;
final int targetY = y + offsetY;
final int targetPx = targetPixels[targetY * targetWidth + targetX];
final int sourcePx = sourcePixels[y * mWidth + x];
// Compares two given pixels (targetPx & sourcePx) to determine whether those
// two pixels are considered to be the same within {@link #TOLERANCE}.
boolean match = targetPx == sourcePx
|| (Math.abs(Color.red(targetPx) - Color.red(sourcePx)) <= TOLERANCE
&& Math.abs(Color.green(targetPx) - Color.green(sourcePx)) <= TOLERANCE
&& Math.abs(Color.blue(targetPx) - Color.blue(sourcePx)) <= TOLERANCE);
if (!match) {
return false;
}
}
}
return true;
}
}
/**
* Not intended to be instantiated.
*/
private Watermark() {
}
private static final BitmapImage sImage;
static {
final long[] bitImage = new long[] {
0b0000000000000000000000000000000000000000000000000000000000000000L,
0b0000000000000000000000000000000000000000000000000000000000000000L,
0b0000000000000000000000000000000000000000000000000000000000000000L,
0b0001111111111111111111111111111111111111111111111111111111111000L,
0b0001111111111111111111111111111111111111111111111111111111111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001100011111011001110101101100000001101101011100110111110011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111100000100110001010010011111110010010100011001000001111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001110011111011001110101101100000001101101011100110111110011000L,
0b0001110101001011101111000011110111011110000111101110100101011000L,
0b0001100100000100110001010010011111110010010100011001000001011000L,
0b0001101110110100010000111100001000100001111000010001011011111000L,
0b0001111111111011001110101101100000001101101011100110111111111000L,
0b0001110011001011101111000011110111011110000111101110100110011000L,
0b0001100001000100110001010010011111110010010100011001000100011000L,
0b0001101101010100010000111100001000100001111000010001010101111000L,
0b0001111110011011001110101101100000001101101011100110110011111000L,
0b0001110010111011101111000011110111011110000111101110111010011000L,
0b0001100001111100110001010010011111110010010100011001111100011000L,
0b0001101101001000010000111100001000100001111000010000100101111000L,
0b0001111110000101001110101101100000001101101011100101000011111000L,
0b0001110010110100101111000011110111011110000111101001011010011000L,
0b0001100001111011110001010010011111110010010100011110111100011000L,
0b0001101101001011100000111100001000100001111000001110100101111000L,
0b0001111110000100010110101101100000001101101011010001000011111000L,
0b0001110010110100010011000011110111011110000110010001011010011000L,
0b0001100001111011101111010010011111110010010111101110111100011000L,
0b0001101101001011101111011100001000100001110111101110100101111000L,
0b0001111110000100010001011101100000001101110100010001000011111000L,
0b0001110010110100010000111101110111011101111000010001011010011000L,
0b0001100001111011101110100101100010001101001011101110111100011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111110000100010001011010011101110010110100010001000011111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001100001111011101110100101100010001101001011101110111100011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111110000100010001011010011101110010110100010001000011111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001100001111011101110100101100010001101001011101110111100011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111110000100010001011010011101110010110100010001000011111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001100001111011101110100101100010001101001011101110111100011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111110000100010001011010011101110010110100010001000011111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001100001111011101110100101100010001101001011101110111100011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111110000100010001011010011101110010110100010001000011111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001100001111011101110100101100010001101001011101110111100011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111110000100010001011010011101110010110100010001000011111000L,
0b0001110010110100010000111100001000100001111000010001011010011000L,
0b0001100001111011101110100101100010001101001011101110111100011000L,
0b0001101101001011101111000011110111011110000111101110100101111000L,
0b0001111110000100010001011010011101110010110100010001000011111000L,
0b0001111111111111111111111111111111111111111111111111111111111000L,
0b0001111111111111111111111111111111111111111111111111111111111000L,
0b0000000000000000000000000000000000000000000000000000000000000000L,
0b0000000000000000000000000000000000000000000000000000000000000000L,
0b0000000000000000000000000000000000000000000000000000000000000000L,
};
final int size = 64;
final long mask = 0b1000000000000000000000000000000000000000000000000000000000000000L;
final int[] pixels = new int[size * size];
for (int y = 0; y < size; ++y) {
for (int x = 0; x < size; ++x) {
pixels[y * size + x] =
((bitImage[y] << x) & mask) == mask ? 0xffffffff : 0xff000000;
}
}
sImage = new BitmapImage(pixels, size, size);
}
/**
* @return {@link Bitmap} object of the unique image.
*/
public static Bitmap create() {
return sImage.toBitmap();
}
/**
* Check the unique image can be found in the specified {@link Bitmap}.
*
* @param bitmap {@link Bitmap} to be checked.
* @return {@code true} if the corresponding unique image is found in the {@code bitmap}.
*/
public static boolean detect(@NonNull Bitmap bitmap) {
final BitmapImage targetImage = BitmapImage.createFromBitmap(bitmap);
// Search from the bottom line with an assumption that the IME is shown at the bottom.
final int targetImageHeight = targetImage.getHeight();
final int targetImageWidth = targetImage.getWidth();
for (int offsetY = targetImageHeight - 1; offsetY >= 0; --offsetY) {
for (int offsetX = 0; offsetX < targetImageWidth; ++offsetX) {
if (sImage.robustMatch(targetImage, offsetX, offsetY)) {
return true;
}
}
}
return false;
}
}
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