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/*
* Copyright 2018 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 android.hardware.display;
/**
* @hide
*/
public final class DisplayedContentSample {
private long mNumFrames;
private long[] mSamplesComponent0;
private long[] mSamplesComponent1;
private long[] mSamplesComponent2;
private long[] mSamplesComponent3;
/**
* Construct an object representing a color histogram of pixels that were displayed on screen.
*
* @param numFrames The number of frames represented by this sample.
* @param mSamplesComponent0 is a histogram counting how many times and for how long a pixel
* of a given value was displayed onscreen for FORMAT_COMPONENT_0. The buckets of the
* histogram are evenly weighted, the number of buckets is device specific.
* The units are in pixels * milliseconds, with 1 pixel millisecond being 1 pixel displayed
* onscreen for 1ms.
* eg, for RGBA_8888, if sampleComponent0 is {100, 50, 30, 20}, then red component was
* onscreen for 100 pixel milliseconds in range 0x00->0x3F, 30 pixel milliseconds in
* range 0x40->0x7F, etc.
* @param mSamplesComponent1 is the same sample definition as sampleComponent0, but for the
* second component of format.
* @param mSamplesComponent2 is the same sample definition as sampleComponent0, but for the
* third component of format.
* @param mSamplesComponent3 is the same sample definition as sampleComponent0, but for the
* fourth component of format.
*/
public DisplayedContentSample(long numFrames,
long[] sampleComponent0,
long[] sampleComponent1,
long[] sampleComponent2,
long[] sampleComponent3) {
mNumFrames = numFrames;
mSamplesComponent0 = sampleComponent0;
mSamplesComponent1 = sampleComponent1;
mSamplesComponent2 = sampleComponent2;
mSamplesComponent3 = sampleComponent3;
}
public enum ColorComponent {
CHANNEL0,
CHANNEL1,
CHANNEL2,
CHANNEL3,
}
/**
* Returns a color histogram according to component channel.
*
* @param component the component to return, according to the PixelFormat ordering
* (eg, for RGBA, CHANNEL0 is R, CHANNEL1 is G, etc).
*
* @return an evenly weighted histogram counting how many times a pixel was
* displayed onscreen that fell into the corresponding bucket, with the first entry
* corresponding to the normalized 0.0 value, and the last corresponding to the 1.0
* value for that PixelFormat component.
*/
public long[] getSampleComponent(ColorComponent component) {
switch (component) {
case CHANNEL0: return mSamplesComponent0;
case CHANNEL1: return mSamplesComponent1;
case CHANNEL2: return mSamplesComponent2;
case CHANNEL3: return mSamplesComponent3;
default: throw new ArrayIndexOutOfBoundsException();
}
}
/**
* Return the number of frames this sample was collected over.
*
* @return the number of frames that this sample was collected over.
*/
public long getNumFrames() {
return mNumFrames;
}
}
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