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/*
* Copyright (C) 2012 The Android Open Source Project
* Copyright (C) 2013-2015 The CyanogenMod 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.camera.ui;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.util.AttributeSet;
import android.util.MathUtils;
import android.view.View;
import com.android.camera.CameraManager;
import org.codeaurora.snapcam.R;
public class HistogramView extends View {
private static final String TAG = "CAM_" + HistogramView.class.getSimpleName();
private static final int STATS_SIZE = 256;
private static final int CELL_COUNT = 64;
private int[] mData = new int[STATS_SIZE + 1];
private boolean mDataValid;
private Bitmap mBitmap;
private Paint mPaint = new Paint();
private Paint mPaintRect = new Paint();
private Canvas mCanvas = new Canvas();
private float mWidth;
private float mHeight;
private CameraManager.CameraProxy mGraphCameraDevice;
public HistogramView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
setWillNotDraw(false);
}
public void setCamera(CameraManager.CameraProxy camera) {
mGraphCameraDevice = camera;
if (camera == null) {
mDataValid = false;
}
}
public void updateData(int[] data) {
if (data.length == mData.length) {
System.arraycopy(data, 0, mData, 0, data.length);
drawGraph();
mDataValid = true;
invalidate();
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_4444);
mCanvas.setBitmap(mBitmap);
mWidth = w;
mHeight = h;
if (mDataValid) {
drawGraph();
}
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas) {
if (mDataValid && mBitmap != null) {
canvas.drawBitmap(mBitmap, 0, 0, null);
if (mGraphCameraDevice != null) {
mGraphCameraDevice.sendHistogramData();
}
}
}
public void setOrientation(int orientation) {
setRotation(-orientation);
int top = getContext().getResources().getDimensionPixelSize(R.dimen.preview_top_margin);
if (orientation == 0 || orientation == 180) {
setTranslationX(0);
setTranslationY(0);
} else {
setTranslationX(mHeight / 2);
setTranslationY(-(top / 2));
}
}
private void drawGraph() {
float padding = 10;
float height = mHeight - (padding * 2);
float width = mWidth - (padding * 2);
int cellWidth = Math.round(width / CELL_COUNT);
mCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
mPaintRect.setColor(Color.WHITE);
//Assumption: The first element contains the maximum value.
int maxValue = Integer.MIN_VALUE;
if (mData[0] == 0) {
for (int i = 1; i <= STATS_SIZE; i++) {
maxValue = Math.max(maxValue, mData[i]);
}
} else {
maxValue = mData[0];
}
int[] values = new int[CELL_COUNT];
int cell = 0;
float sum = 0.0f;
for (int i = 1; i < STATS_SIZE; i++) {
sum += (float) mData[i] / (float) maxValue;
if ((i % cellWidth) == 0) {
float mean = sum / cellWidth;
int value = Math.round(MathUtils.lerp(0, height, mean));
values[cell] = value;
float left = padding + (cell * cellWidth);
float right = left + cellWidth - 2;
float bottom = mHeight - (padding / 2);
float top = bottom - value;
mCanvas.drawRect(left, top, right, bottom, mPaintRect);
sum = 0.0f;
cell++;
}
}
}
}
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