/**
* @param sampleLegendFile
* @return
*/
private Dimension getSizeFromSample(File sampleLegendFile) {
PngReader pngReader = null;
try {
// reads size using PNGJ reader, that can read metadata without reading
// the full image
pngReader = new PngReader(sampleLegendFile);
return new Dimension(pngReader.imgInfo.cols, pngReader.imgInfo.rows);
} finally {
if (pngReader != null) {
pngReader.close();
}
}
}
public static void reencode(String orig, FilterType filterType, int cLevel) {
long t0 = System.currentTimeMillis();
String suffix =
filterType.toString().replace("FILTER_", "").toLowerCase() + "_" + String.valueOf(cLevel);
String dest = orig.replaceAll("\\.png$", "") + "_" + suffix + ".png";
PngReader pngr = FileHelper.createPngReader(new File(orig));
PngWriter pngw = FileHelper.createPngWriter(new File(dest), pngr.imgInfo, true);
pngw.setFilterType(filterType);
pngw.setCompLevel(cLevel);
pngw.copyChunksFirst(pngr, ChunkCopyBehaviour.COPY_ALL);
for (int row = 0; row < pngr.imgInfo.rows; row++) {
ImageLine l1 = pngr.readRow(row);
pngw.writeRow(l1, row);
}
pngr.end();
pngw.copyChunksLast(pngr, ChunkCopyBehaviour.COPY_ALL);
pngw.end();
long t1 = System.currentTimeMillis();
long size0 = (new File(orig)).length();
long size1 = (new File(dest)).length();
double sizerel = (size1 * 1000.0) / size0;
System.out.printf("%s\t%d\t%.2f\n", dest, (t1 - t0), sizerel);
}