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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.gfx;
import org.json.JSONException;
import org.json.JSONObject;
public class IntSize {
public final int width, height;
public IntSize(IntSize size) { width = size.width; height = size.height; }
public IntSize(int inWidth, int inHeight) { width = inWidth; height = inHeight; }
public IntSize(FloatSize size) {
width = Math.round(size.width);
height = Math.round(size.height);
}
public IntSize(JSONObject json) {
try {
width = json.getInt("width");
height = json.getInt("height");
} catch (JSONException e) {
throw new RuntimeException(e);
}
}
public int getArea() {
return width * height;
}
public boolean equals(IntSize size) {
return ((size.width == width) && (size.height == height));
}
public boolean isPositive() {
return (width > 0 && height > 0);
}
@Override
public String toString() { return "(" + width + "," + height + ")"; }
public IntSize scale(float factor) {
return new IntSize(Math.round(width * factor),
Math.round(height * factor));
}
/* Returns the power of two that is greater than or equal to value */
public static int nextPowerOfTwo(int value) {
// code taken from http://acius2.blogspot.com/2007/11/calculating-next-power-of-2.html
if (0 == value--) {
return 1;
}
value = (value >> 1) | value;
value = (value >> 2) | value;
value = (value >> 4) | value;
value = (value >> 8) | value;
value = (value >> 16) | value;
return value + 1;
}
public IntSize nextPowerOfTwo() {
return new IntSize(nextPowerOfTwo(width), nextPowerOfTwo(height));
}
public static boolean isPowerOfTwo(int value) {
if (value == 0)
return false;
return (value & (value - 1)) == 0;
}
public static int largestPowerOfTwoLessThan(float value) {
int val = (int) Math.floor(value);
if (val <= 0) {
throw new IllegalArgumentException("Error: value must be > 0");
}
// keep dropping the least-significant set bits until only one is left
int bestVal = val;
while (val != 0) {
bestVal = val;
val &= (val - 1);
}
return bestVal;
}
}
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