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/*
Ported to JavaScript by Lazar Laszlo 2011
lazarsoft@gmail.com, www.lazarsoft.info
*/
/*
*
* Copyright 2007 ZXing authors
*
* 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.
*/
function BitMatrix( width, height)
{
if(!height)
height=width;
if (width < 1 || height < 1)
{
throw "Both dimensions must be greater than 0";
}
this.width = width;
this.height = height;
var rowSize = width >> 5;
if ((width & 0x1f) != 0)
{
rowSize++;
}
this.rowSize = rowSize;
this.bits = new Array(rowSize * height);
for(var i=0;i<this.bits.length;i++)
this.bits[i]=0;
this.__defineGetter__("Width", function()
{
return this.width;
});
this.__defineGetter__("Height", function()
{
return this.height;
});
this.__defineGetter__("Dimension", function()
{
if (this.width != this.height)
{
throw "Can't call getDimension() on a non-square matrix";
}
return this.width;
});
this.get_Renamed=function( x, y)
{
var offset = y * this.rowSize + (x >> 5);
return ((URShift(this.bits[offset], (x & 0x1f))) & 1) != 0;
}
this.set_Renamed=function( x, y)
{
var offset = y * this.rowSize + (x >> 5);
this.bits[offset] |= 1 << (x & 0x1f);
}
this.flip=function( x, y)
{
var offset = y * this.rowSize + (x >> 5);
this.bits[offset] ^= 1 << (x & 0x1f);
}
this.clear=function()
{
var max = this.bits.length;
for (var i = 0; i < max; i++)
{
this.bits[i] = 0;
}
}
this.setRegion=function( left, top, width, height)
{
if (top < 0 || left < 0)
{
throw "Left and top must be nonnegative";
}
if (height < 1 || width < 1)
{
throw "Height and width must be at least 1";
}
var right = left + width;
var bottom = top + height;
if (bottom > this.height || right > this.width)
{
throw "The region must fit inside the matrix";
}
for (var y = top; y < bottom; y++)
{
var offset = y * this.rowSize;
for (var x = left; x < right; x++)
{
this.bits[offset + (x >> 5)] |= 1 << (x & 0x1f);
}
}
}
}