public void Read(ref int[,] array, int offsetX, int offsetY, int width, int height, int min, int max)
{
int lastX = offsetX + width, lastY = offsetY + height;
int count = max - min;
int bits = IntegerMath.ILog2(IntegerMath.ToPowerOf2(Math.Abs(count)));
if (max >= 0)
{
for (int y = offsetY; y < lastY; y++)
{
for (int x = offsetX; x < lastX; x++)
{
array[x, y] = br.ReadBits(bits) + min;
}
}
}
else
{
for (int y = offsetY; y < lastY; y++)
{
for (int x = offsetX; x < lastX; x++)
{
array[x, y] = -br.ReadBits(bits) + min;
}
}
}
}
/// <summary>
/// Perfroms a inverse two dimensional isotropic wavelet transformation for the declared area of the array. The result is copied back to the declared array.
/// </summary>
/// <param name="array">2d float array on which the transformation should be performed</param>
/// <param name="offsetX">x position of the area</param>
/// <param name="offsetY">y position of the area</param>
/// <param name="width">width of the area</param>
/// <param name="height">height of the area</param>
/// <exception cref="ArgumentException"></exception>
virtual public void BackTransformIsotropic2D(ref float[,] array, int offsetX, int offsetY, int width, int height)
{
//There might be better/simpler solutions to solve this transformation... However, it's working ;-)
int szHorizontal, szVertical; //horizontal size(width) and vertical size(height)
int iDifference = IntegerMath.ILog2(width) - IntegerMath.ILog2(height);
szHorizontal = szMinHorz;
szVertical = szMinVert;
CheckArguments(offsetX, offsetY, width, height);
if (iDifference > 0) // width is greater than height
{
for (int i = 0; i < iDifference; i++)
{
for (int y = offsetY; y < szVertical + offsetY; y++)
{
//back transform horizontal
BackTransformRow(ref array, y, offsetX, szHorizontal);
}
szHorizontal <<= 1; // multiply width by 2
}
}
else if (iDifference < 0) // height is greater than width
{
for (int i = 0; i < -iDifference; i++)
{
for (int x = offsetX; x < szHorizontal + offsetX; x++)
{
//back transform vertical
BackTransformColumn(ref array, x, offsetY, szVertical);
}
szVertical <<= 1; // multiply height by 2
}
}
while (szHorizontal <= width) //just necessary to check the width, as the number of remaining horizontal and vertical transformations are equal now. (szVertical <= iHeight) || (szHorizontal <= iWidth))
{
for (int x = offsetX; x < szHorizontal + offsetX; x++)
{
//back transform vertical
BackTransformColumn(ref array, x, offsetY, szVertical);
}
for (int y = offsetY; y < szVertical + offsetY; y++)
{
//back transform horizontal
BackTransformRow(ref array, y, offsetX, szHorizontal);
}
szVertical <<= 1;
szHorizontal <<= 1;
}
}
public void Write(ref int[,] array, int offsetX, int offsetY, int width, int height, ref int posMin, ref int posMax, ref int negMin, ref int negMax)
{
int countPos, countNeg, bitsPos, bitsNeg, lastX = offsetX + width, lastY = offsetY + height;
int val, iCount = 0, x, y;
bool bDo, bLastZero;
posMin = int.MaxValue;
posMax = int.MinValue;
negMin = int.MaxValue;
negMax = int.MinValue;
for (y = offsetY; y < lastY; y++)
{
for (x = offsetX; x < lastX; x++)
{
val = array[x, y];
if (val > 0)
{
if (val > posMax)
{
posMax = val;
}
if (val < posMin)
{
posMin = val;
}
}
else if (val < 0)
{
if (val > negMax)
{
negMax = val;
}
if (val < negMin)
{
negMin = val;
}
}
}
}
countPos = posMax - posMin;
bitsPos = IntegerMath.ILog2(IntegerMath.ToPowerOf2(Math.Abs(countPos) + 1));
countNeg = negMax - negMin;
bitsNeg = IntegerMath.ILog2(IntegerMath.ToPowerOf2(Math.Abs(countNeg) + 1));
x = 0;
y = 0;
bLastZero = false;
if (0 >= 0)
{
val = array[x, y];
bDo = true;
while (bDo)
{
iCount++;
val = array[x, y];
if ((val < 0) || (val > 0))
{
if (bLastZero == true)
{
bLastZero = false;
bDo = false;
}
}
else
{
if (bLastZero == false)
{
bLastZero = true;
bDo = false;
}
}
x++;
iCount++;
if (x > lastX)
{
y++;
x = offsetX;
}
if (y > lastY)
{
bDo = false;
}
}
for (y = offsetY; y < lastY; y++)
{
for (x = offsetX; x < lastX; x++)
{
val = array[x, y];
if (val > 0)
{
bw.WriteBits(val - posMin, bitsPos);
}
else if (val < 0)
{
bw.WriteBits(-val + negMax, bitsNeg);
}
else
{
}
}
}
}
else
{
}
}