int QueryRGBBufferSize(const Header &header, const int element) {
return QueryRGBBufferSizeInternal(header.ImageDescriptor(element),
header.Width() * header.Height(),
header.ComponentByteCount(element));
}
int QueryRGBBufferSize(const Header &header, const int element, const Block &block) {
return QueryRGBBufferSizeInternal(header.ImageDescriptor(element),
(block.x2 - block.x1 + 1) * (block.y2 - block.y1 + 1),
header.ComponentByteCount(element));
}