protected internal virtual void initChilds()
{
Subband subb_LL = LL;
Subband subb_HL = HL;
Subband subb_LH = LH;
Subband subb_HH = HH;
// LL subband
subb_LL.level = level + 1;
subb_LL.ulcx = (ulcx + 1) >> 1;
subb_LL.ulcy = (ulcy + 1) >> 1;
subb_LL.ulx = ulx;
subb_LL.uly = uly;
subb_LL.w = ((ulcx + w + 1) >> 1) - subb_LL.ulcx;
subb_LL.h = ((ulcy + h + 1) >> 1) - subb_LL.ulcy;
// If this subband in in the all LL path (i.e. it's global orientation
// is LL) then child LL band contributes to a lower resolution level.
subb_LL.resLvl = (orientation == WT_ORIENT_LL)?resLvl - 1:resLvl;
subb_LL.anGainExp = anGainExp;
subb_LL.sbandIdx = (sbandIdx << 2);
// HL subband
subb_HL.orientation = WT_ORIENT_HL;
subb_HL.level = subb_LL.level;
subb_HL.ulcx = ulcx >> 1;
subb_HL.ulcy = subb_LL.ulcy;
subb_HL.ulx = ulx + subb_LL.w;
subb_HL.uly = uly;
subb_HL.w = ((ulcx + w) >> 1) - subb_HL.ulcx;
subb_HL.h = subb_LL.h;
subb_HL.resLvl = resLvl;
subb_HL.anGainExp = anGainExp + 1;
subb_HL.sbandIdx = (sbandIdx << 2) + 1;
// LH subband
subb_LH.orientation = WT_ORIENT_LH;
subb_LH.level = subb_LL.level;
subb_LH.ulcx = subb_LL.ulcx;
subb_LH.ulcy = ulcy >> 1;
subb_LH.ulx = ulx;
subb_LH.uly = uly + subb_LL.h;
subb_LH.w = subb_LL.w;
subb_LH.h = ((ulcy + h) >> 1) - subb_LH.ulcy;
subb_LH.resLvl = resLvl;
subb_LH.anGainExp = anGainExp + 1;
subb_LH.sbandIdx = (sbandIdx << 2) + 2;
// HH subband
subb_HH.orientation = WT_ORIENT_HH;
subb_HH.level = subb_LL.level;
subb_HH.ulcx = subb_HL.ulcx;
subb_HH.ulcy = subb_LH.ulcy;
subb_HH.ulx = subb_HL.ulx;
subb_HH.uly = subb_LH.uly;
subb_HH.w = subb_HL.w;
subb_HH.h = subb_LH.h;
subb_HH.resLvl = resLvl;
subb_HH.anGainExp = anGainExp + 2;
subb_HH.sbandIdx = (sbandIdx << 2) + 3;
}
