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// File: Voxel_ColorDS.cxx
// Created: Mon May 08 12:36:31 2008
// Author: Vladislav ROMASHKO
// <vladislav.romashko@opencascade.com>
#include <Voxel_ColorDS.ixx>
#include <stdlib.h>
static Standard_Byte gbits[8] = {1, 2, 4, 8, 16, 32, 64, 128};
static Standard_Byte gnbits[8] = {255-1, 255-2, 255-4, 255-8, 255-16, 255-32, 255-64, 255-128};
// Empty constructor
Voxel_ColorDS::Voxel_ColorDS():Voxel_DS()
{
}
// Constructor with intialization.
Voxel_ColorDS::Voxel_ColorDS(const Standard_Real x, const Standard_Real y, const Standard_Real z,
const Standard_Real xlen, const Standard_Real ylen, const Standard_Real zlen,
const Standard_Integer nbx, const Standard_Integer nby, const Standard_Integer nbz)
:Voxel_DS()
{
Init(x, y, z, xlen, ylen, zlen, nbx, nby, nbz);
}
// Initialization.
void Voxel_ColorDS::Init(const Standard_Real x, const Standard_Real y, const Standard_Real z,
const Standard_Real xlen, const Standard_Real ylen, const Standard_Real zlen,
const Standard_Integer nbx, const Standard_Integer nby, const Standard_Integer nbz)
{
Destroy();
Voxel_DS::Init(x, y, z, xlen, ylen, zlen, nbx, nby, nbz);
if (!myNbX || !myNbY || !myNbZ)
return;
Standard_Integer nb_bytes = RealToInt(ceil(myNbXY * myNbZ / 2.0));
Standard_Integer nb_slices = RealToInt(ceil(nb_bytes / 32.0));
myData = (Standard_Address) calloc(nb_slices, sizeof(Standard_Byte*));
}
// Destructor
void Voxel_ColorDS::Destroy()
{
if (myData)
{
SetZero();
free((Standard_Byte**)myData);
myData = 0;
}
}
void Voxel_ColorDS::SetZero()
{
if (myData)
{
Standard_Integer nb_bytes = RealToInt(ceil(myNbXY * myNbZ / 2.0));
Standard_Integer ix = 0, nb_slices = RealToInt(ceil(nb_bytes / 32.0));
for (; ix < nb_slices; ix++)
{
if (((Standard_Byte**)myData)[ix])
{
free(((Standard_Byte**)myData)[ix]);
((Standard_Byte**)myData)[ix] = 0;
}
}
}
}
// Access to the boolean information attached to a particular voxel:
// Info: (ix >= 0 && ix < theNb_x), etc.
void Voxel_ColorDS::Set(const Standard_Integer ix, const Standard_Integer iy, const Standard_Integer iz,
const Standard_Byte data)
{
Standard_Integer ibit = 4 * (ix + myNbX * iy + myNbXY * iz);
Standard_Integer islice = ibit >> 8;
if (!data && !((Standard_Byte**)myData)[islice])
return; // don't allocate a slice of data for setting a 0 value
// Allocate the slice if it is not done yet.
if (!((Standard_Byte**)myData)[islice])
{
((Standard_Byte**)myData)[islice] = (Standard_Byte*) calloc(32/*number of bytes in slice*/, sizeof(Standard_Byte));
}
// Index within 32 bytes of the slice.
Standard_Integer ibit_in_current_slice = ibit - (islice << 8);
Standard_Integer ibyte = ibit_in_current_slice >> 3;
// Value (byte)
Standard_Byte value = ((Standard_Byte*)((Standard_Byte**)myData)[islice])[ibyte];
// Position of data in the 8 bit-"value":
// It is either 0 (first part of the byte) or 2 (second part of the byte)
Standard_Integer shift = ibit_in_current_slice - (ibyte << 3);
// Set data
Standard_Integer i = 0, j = 0, nb = 4; // first part of byte
if (shift == 4)
{
// second part of byte
i = 4;
nb = 8;
}
for (; i < nb; i++, j++)
{
if (data & gbits[j]) // if j-th bit is 1
{
value |= gbits[i]; // set 1 to the i-th bit
}
else
{
value &= gnbits[i]; // set 0 to the i-th bit
}
}
((Standard_Byte*)((Standard_Byte**)myData)[islice])[ibyte] = value;
}
Standard_Byte Voxel_ColorDS::Get(const Standard_Integer ix, const Standard_Integer iy, const Standard_Integer iz) const
{
Standard_Byte ret = 0;
Standard_Integer ibit = 4 * (ix + myNbX * iy + myNbXY * iz);
Standard_Integer islice = ibit >> 8;
// If the slice of data is not allocated, it means that its values are 0.
if (!((Standard_Byte**)myData)[islice])
return ret;
// Index within 8 bytes of the slice.
Standard_Integer ibit_in_current_slice = ibit - (islice << 8);
Standard_Integer ibyte = ibit_in_current_slice >> 3;
// Value (byte)
Standard_Byte value = ((Standard_Byte*)((Standard_Byte**)myData)[islice])[ibyte];
// Position of data in the 8 bit-"value".
Standard_Integer shift = ibit_in_current_slice - (ibyte << 3);
// Return a byte with 4 first bits filled-in by the value.
Standard_Integer i = 0, j = 0, nb = 4; // first part of byte
if (shift == 4)
{
// second part of byte
i = 4;
nb = 8;
}
for (; i < nb; i++, j++)
{
if (value & gbits[i]) // if i-th bit is 1
{
ret |= gbits[j]; // set 1 to the j-th bit
}
}
return ret;
}
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