void thresholdImpl( const SurfaceT<T> &srcSurface, T value, const Area &srcArea, const ivec2 &dstLT, SurfaceT<T> *dstSurface )
{
std::pair<Area,ivec2> srcDst = clippedSrcDst( srcSurface.getBounds(), srcArea, dstSurface->getBounds(), dstLT );
const Area &area( srcDst.first );
const ivec2 &dstOffset( srcDst.second );
ptrdiff_t srcRowBytes = srcSurface.getRowBytes();
uint8_t srcPixelInc = srcSurface.getPixelInc();
uint8_t srcRedOffset = srcSurface.getRedOffset(), srcGreenOffset = srcSurface.getGreenOffset(), srcBlueOffset = srcSurface.getBlueOffset();
ptrdiff_t dstRowBytes = dstSurface->getRowBytes();
uint8_t dstPixelInc = dstSurface->getPixelInc();
uint8_t dstRedOffset = dstSurface->getRedOffset(), dstGreenOffset = dstSurface->getGreenOffset(), dstBlueOffset = dstSurface->getBlueOffset();
const T maxValue = CHANTRAIT<T>::max();
for( int32_t y = 0; y < area.getHeight(); ++y ) {
T *dstPtr = reinterpret_cast<T*>( reinterpret_cast<uint8_t*>( dstSurface->getData() + ( dstOffset.x + area.getX1() ) * dstPixelInc ) + ( y + dstOffset.y ) * dstRowBytes );
const T *srcPtr = reinterpret_cast<const T*>( reinterpret_cast<const uint8_t*>( srcSurface.getData() + area.getX1() * srcPixelInc ) + ( y + area.getY1() ) * srcRowBytes );
for( int32_t x = area.getX1(); x < area.getX2(); ++x ) {
dstPtr[dstRedOffset] = ( srcPtr[srcRedOffset] > value ) ? maxValue : 0;
dstPtr[dstGreenOffset] = ( srcPtr[srcGreenOffset] > value ) ? maxValue : 0;
dstPtr[dstBlueOffset] = ( srcPtr[srcBlueOffset] > value ) ? maxValue : 0;;
dstPtr += dstPixelInc;
srcPtr += srcPixelInc;
}
}
}
