1 files changed, 134 insertions, 0 deletions
diff --git a/ui/android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java b/ui/android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java
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+++ b/ui/android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.ui.gfx;
+
+import android.content.Context;
+import android.graphics.PixelFormat;
+import android.telephony.TelephonyManager;
+import android.util.DisplayMetrics;
+import android.view.Display;
+import android.view.WindowManager;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+/**
+ * This class facilitates access to android information typically only
+ * available using the Java SDK, including {@link Display} properties.
+ *
+ * Currently the information consists of very raw display information (height, width, DPI scale)
+ * regarding the main display.
+ */
+@JNINamespace("gfx")
+public class DeviceDisplayInfo {
+
+  private WindowManager mWinManager;
+
+  private DeviceDisplayInfo(Context context) {
+      Context appContext = context.getApplicationContext();
+      mWinManager = (WindowManager) appContext.getSystemService(Context.WINDOW_SERVICE);
+  }
+
+  /**
+   * @return Display height in physical pixels.
+   */
+  @CalledByNative
+  public int getDisplayHeight() {
+      return getMetrics().heightPixels;
+  }
+
+  /**
+   * @return Display width in physical pixels.
+   */
+  @CalledByNative
+  public int getDisplayWidth() {
+      return getMetrics().widthPixels;
+  }
+
+  /**
+   * @return Bits per pixel.
+   */
+  @CalledByNative
+  public int getBitsPerPixel() {
+      PixelFormat info = new PixelFormat();
+      PixelFormat.getPixelFormatInfo(getDisplay().getPixelFormat(), info);
+      return info.bitsPerPixel;
+  }
+
+  /**
+   * @return Bits per component.
+   */
+  @CalledByNative
+  public int getBitsPerComponent() {
+      int format = getDisplay().getPixelFormat();
+      switch (format) {
+      case PixelFormat.RGBA_4444:
+          return 4;
+
+      case PixelFormat.RGBA_5551:
+          return 5;
+
+      case PixelFormat.RGBA_8888:
+      case PixelFormat.RGBX_8888:
+      case PixelFormat.RGB_888:
+          return 8;
+
+      case PixelFormat.RGB_332:
+          return 2;
+
+      case PixelFormat.RGB_565:
+          return 5;
+
+      // Non-RGB formats.
+      case PixelFormat.A_8:
+      case PixelFormat.LA_88:
+      case PixelFormat.L_8:
+          return 0;
+
+      // Unknown format. Use 8 as a sensible default.
+      default:
+          return 8;
+      }
+  }
+
+  /**
+   * @return A scaling factor for the Density Independent Pixel unit.
+   *         1.0 is 160dpi, 0.75 is 120dpi, 2.0 is 320dpi.
+   */
+  @CalledByNative
+  public double getDIPScale() {
+      return getMetrics().density;
+  }
+
+  /**
+   * @return Display refresh rate in frames per second.
+   */
+  @CalledByNative
+  public double getRefreshRate() {
+      double result = getDisplay().getRefreshRate();
+      // Sanity check.
+      return (result >= 61 || result < 30) ? 0 : result;
+  }
+
+  private Display getDisplay() {
+      return mWinManager.getDefaultDisplay();
+  }
+
+  private DisplayMetrics getMetrics() {
+      DisplayMetrics metrics = new DisplayMetrics();
+      getDisplay().getMetrics(metrics);
+      return metrics;
+  }
+
+  /**
+   * Creates DeviceDisplayInfo for a given Context.
+   * @param context A context to use.
+   * @return DeviceDisplayInfo associated with a given Context.
+   */
+  @CalledByNative
+  public static DeviceDisplayInfo create(Context context) {
+      return new DeviceDisplayInfo(context);
+  }
+}