android/source/src/java/org/mozilla/gecko/gfx/DisplayPortMetrics.java

   1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   4  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 package org.mozilla.gecko.gfx;
   7
   8 import android.graphics.RectF;
   9
  10 import org.mozilla.gecko.util.FloatUtils;
  11
  12 /*
  13  * This class keeps track of the area we request Gecko to paint, as well
  14  * as the resolution of the paint. The area may be different from the visible
  15  * area of the page, and the resolution may be different from the resolution
  16  * used in the compositor to render the page. This is so that we can ask Gecko
  17  * to paint a much larger area without using extra memory, and then render some
  18  * subsection of that with compositor scaling.
  19  */
  20 public final class DisplayPortMetrics {
  21     private final RectF mPosition;
  22     private final float mResolution;
  23
  24     public RectF getPosition() {
  25         return mPosition;
  26     }
  27
  28     public float getResolution() {
  29         return mResolution;
  30     }
  31
  32     public DisplayPortMetrics() {
  33         this(0, 0, 0, 0, 1);
  34     }
  35
  36     public DisplayPortMetrics(float left, float top, float right, float bottom, float resolution) {
  37         mPosition = new RectF(left, top, right, bottom);
  38         mResolution = resolution;
  39     }
  40
  41     public boolean contains(RectF rect) {
  42         return mPosition.contains(rect);
  43     }
  44
  45     public boolean fuzzyEquals(DisplayPortMetrics metrics) {
  46         return RectUtils.fuzzyEquals(mPosition, metrics.mPosition)
  47             && FloatUtils.fuzzyEquals(mResolution, metrics.mResolution);
  48     }
  49
  50     public String toJSON() {
  51         StringBuffer sb = new StringBuffer(256);
  52         sb.append("{ \"left\": ").append(mPosition.left)
  53           .append(", \"top\": ").append(mPosition.top)
  54           .append(", \"right\": ").append(mPosition.right)
  55           .append(", \"bottom\": ").append(mPosition.bottom)
  56           .append(", \"resolution\": ").append(mResolution)
  57           .append('}');
  58         return sb.toString();
  59     }
  60
  61     @Override
  62     public String toString() {
  63         return "DisplayPortMetrics v=(" + mPosition.left + ","
  64                 + mPosition.top + "," + mPosition.right + ","
  65                 + mPosition.bottom + ") z=" + mResolution;
  66     }
  67 }