// LERC 1 compression
static CPLErr CompressLERC(buf_mgr &dst, buf_mgr &src, const ILImage &img, double precision)
{
CntZImage zImg;
// Fill data into zImg
#define FILL(T) CntZImgFill(zImg, (T *)(src.buffer), img)
switch (img.dt) {
case GDT_Byte: FILL(GByte); break;
case GDT_UInt16: FILL(GUInt16); break;
case GDT_Int16: FILL(GInt16); break;
case GDT_Int32: FILL(GInt32); break;
case GDT_UInt32: FILL(GUInt32); break;
case GDT_Float32: FILL(float); break;
case GDT_Float64: FILL(double); break;
default: break;
}
#undef FILL
Byte *ptr = (Byte *)dst.buffer;
// if it can't compress in output buffer it will crash
if (!zImg.write(&ptr, precision)) {
CPLError(CE_Failure,CPLE_AppDefined,"MRF: Error during LERC compression");
return CE_Failure;
}
// write changes the value of the pointer, we can find the size by testing how far it moved
dst.size = ptr - (Byte *)dst.buffer;
CPLDebug("MRF_LERC","LERC Compressed to %d\n", (int)dst.size);
return CE_None;
}
