56 lines
1.3 KiB
JavaScript
56 lines
1.3 KiB
JavaScript
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// Find all JPEG-2000 images and turn them into regular images.
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var doc = new PDFDocument(scriptArgs[0]);
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function isJPXImage(ref) {
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if ("Filter" in ref) {
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var filter = ref.Filter;
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if (filter == "JPXDecode")
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return true;
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if (filter.isArray())
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for (var i = 0; i < filter.length; ++i)
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if (filter[i] == "JPXDecode")
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return true;
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}
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return false;
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}
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var i, n, ref;
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var jpxList = {};
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var smaskList = {};
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// Preload and destroy all JPX images.
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n = doc.countObjects();
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for (i=1; i < n; ++i) {
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ref = doc.newIndirect(i, 0);
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if (isJPXImage(ref)) {
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print("Loading JPX image:", i)
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jpxList[i] = doc.loadImage(ref);
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if ("SMask" in ref)
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smaskList[i] = ref.SMask;
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ref.writeObject(null); // make sure we don't reuse the JPX image resource
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}
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}
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for (i in jpxList) {
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ref = doc.newIndirect(i, 0);
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var jpx = jpxList[i];
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var pix = jpx.toPixmap();
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var raw = new Image(pix);
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// Create a new image, then copy the data to the old object, then delete it.
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print("Decompressed image:", i);
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var img = doc.addImage(raw);
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if (i in smaskList)
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img.SMask = smaskList[i];
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ref.writeObject(img.resolve());
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ref.writeRawStream(img.readRawStream());
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doc.deleteObject(img);
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// Invoke the GC to free intermediate pixmaps and images.
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gc();
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}
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doc.save(scriptArgs[1], "compress,garbage=compact");
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