1 files changed, 130 insertions, 0 deletions
diff --git a/src/com/android/camera/ui/HistogramView.java b/src/com/android/camera/ui/HistogramView.java
new file mode 100644
index 000000000..2ae2c40a8
--- /dev/null
+++ b/src/com/android/camera/ui/HistogramView.java
@@ -0,0 +1,130 @@
+/*
+ * 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.util.AttributeSet;
+import android.view.View;
+
+import com.android.camera.CameraManager;
+
+public class HistogramView extends View {
+    private static final int STATS_SIZE = 256;
+
+    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);
+        mPaintRect.setColor(0xFFFFFFFF);
+        mPaintRect.setStyle(Paint.Style.FILL);
+    }
+
+    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.RGB_565);
+        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();
+            }
+        }
+    }
+
+    private void drawGraph() {
+        final float border = 5;
+        float graphheight = mHeight - (2 * border);
+        float graphwidth = mWidth - (2 * border);
+        float bargap = 0.0f;
+        float barwidth = graphwidth/STATS_SIZE;
+
+        mCanvas.drawColor(0xFFAAAAAA);
+        mPaint.setColor(Color.BLACK);
+
+        for (int k = 0; k <= (graphheight /32) ; k++) {
+            float y = (float)(32 * k)+ border;
+            mCanvas.drawLine(border, y, graphwidth + border , y, mPaint);
+        }
+        for (int j = 0; j <= (graphwidth /32); j++) {
+            float x = (float)(32 * j)+ border;
+            mCanvas.drawLine(x, border, x, graphheight + border, mPaint);
+        }
+
+        //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];
+        }
+
+        for (int i = 1; i <= STATS_SIZE; i++)  {
+            float scaled = Math.min(STATS_SIZE,
+                    (float) mData[i] * (float) STATS_SIZE / (float) maxValue);
+            float left = (bargap * (i+1)) + (barwidth * i) + border;
+            float top = graphheight + border;
+            float right = left + barwidth;
+            float bottom = top - scaled;
+            mCanvas.drawRect(left, top, right, bottom, mPaintRect);
+        }
+    }
+}
+