THPDFZopfliFlateInfo Record
THPDFZopfliFlateInfo reports whether Zopfli was attempted, completed, rejected by a budget, or selected over the zlib baseline
Size fields expose the input, baseline, Zopfli, final output, and bytes saved over the baseline, while iteration, block, elapsed-time, and diagnostic fields explain the decision
UsedZopfli is true only when the completed result is strictly smaller than the baseline and remains within every configured budget