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/*
* Copyright (C) 2014 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.systemui.recents;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
/* Common code */
public class Utilities {
/**
* Calculates a consistent animation duration (ms) for all animations depending on the movement
* of the object being animated.
*/
public static int calculateTranslationAnimationDuration(int distancePx) {
return calculateTranslationAnimationDuration(distancePx, 100);
}
public static int calculateTranslationAnimationDuration(int distancePx, int minDuration) {
RecentsConfiguration config = RecentsConfiguration.getInstance();
return Math.max(minDuration, (int) (1000f /* ms/s */ *
(Math.abs(distancePx) / config.animationPxMovementPerSecond)));
}
/** Scales a rect about its centroid */
public static void scaleRectAboutCenter(Rect r, float scale) {
if (scale != 1.0f) {
int cx = r.centerX();
int cy = r.centerY();
r.offset(-cx, -cy);
r.left = (int) (r.left * scale + 0.5f);
r.top = (int) (r.top * scale + 0.5f);
r.right = (int) (r.right * scale + 0.5f);
r.bottom = (int) (r.bottom * scale + 0.5f);
r.offset(cx, cy);
}
}
/** Calculates the luminance-preserved greyscale of a given color. */
private static int colorToGreyscale(int color) {
return Math.round(0.2126f * Color.red(color) + 0.7152f * Color.green(color) +
0.0722f * Color.blue(color));
}
/** Returns the ideal color to draw on top of a specified background color. */
public static int getIdealColorForBackgroundColor(int color, int lightRes, int darkRes) {
int greyscale = colorToGreyscale(color);
return (greyscale < 128) ? lightRes : darkRes;
}
/** Returns the ideal drawable to draw on top of a specified background color. */
public static Drawable getIdealResourceForBackgroundColor(int color, Drawable lightRes,
Drawable darkRes) {
int greyscale = colorToGreyscale(color);
return (greyscale < 128) ? lightRes : darkRes;
}
}
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