net.sourceforge.plantuml.zopfli.Katajainen Maven / Gradle / Ivy

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 * are owned by the author of their corresponding sources code (that is, their
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 * this BSD license.
 *
 * The generated images can then be used without any reference to the BSD license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
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 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */

package net.sourceforge.plantuml.zopfli;

import net.sourceforge.plantuml.zopfli.Cookie.Node;

class Katajainen {
    // ::remove folder when __HAXE__

	static void lengthLimitedCodeLengths(Cookie cookie, int[] frequencies, int maxBits, int[] bitLengths) {
		cookie.resetPool();
		int n = frequencies.length;
		int nn = 0;
		Node[] leaves = cookie.leaves1;
		for (int i = 0; i < n; i++) {
			if (frequencies[i] != 0) {
				leaves[nn] = cookie.node(frequencies[i], i, null);
				nn++;
			}
		}

		if (nn == 0) {
			return;
		}
		if (nn == 1) {
			bitLengths[leaves[0].count] = 1;
			return;
		}

		Node[] leaves2 = cookie.leaves2;
		System.arraycopy(leaves, 0, leaves2, 0, nn);
		sort(leaves2, leaves, 0, nn);

		Node[] list0 = cookie.list0;
		Node node0 = cookie.node(leaves[0].weight, 1, null);

		Node[] list1 = cookie.list1;
		Node node1 = cookie.node(leaves[1].weight, 2, null);

		for (int i = 0; i < maxBits; ++i) {
			list0[i] = node0;
			list1[i] = node1;
		}

		int numBoundaryPmRuns = 2 * nn - 4;
		for (int i = 0; i < numBoundaryPmRuns; i++) {
			boolean last = i == numBoundaryPmRuns - 1;
			boundaryPm(cookie, leaves, list0, list1, nn, maxBits - 1, last);
		}

		for (Node node = list1[maxBits - 1]; node != null; node = node.tail) {
			for (int i = node.count - 1; i >= 0; --i) {
				bitLengths[leaves[i].count]++;
			}
		}
	}

	private static void boundaryPm(Cookie cookie, Node[] leaves, Node[] list0, Node[] list1, int numSymbols, int index,
			boolean last) {
		int lastCount = list1[index].count;

		if (index == 0 && lastCount >= numSymbols) {
			return;
		}

		list0[index] = list1[index];

		if (index == 0) {
			list1[index] = cookie.node(leaves[lastCount].weight, lastCount + 1, null);
		} else {
			int sum = list0[index - 1].weight + list1[index - 1].weight;
			if (lastCount < numSymbols && sum > leaves[lastCount].weight) {
				list1[index] = cookie.node(leaves[lastCount].weight, lastCount + 1, list1[index].tail);
			} else {
				list1[index] = cookie.node(sum, lastCount, list1[index - 1]);
				if (!last) {
					boundaryPm(cookie, leaves, list0, list1, numSymbols, index - 1, false);
					boundaryPm(cookie, leaves, list0, list1, numSymbols, index - 1, false);
				}
			}
		}
	}

	private static void sort(Node[] src, Node[] dest, int low, int high) {
		int length = high - low;

		if (length < 7) {
			for (int i = low + 1; i < high; i++)
				for (int j = i, k = i - 1; j > low && (dest[k].weight > dest[j].weight); --j, --k) {
					Node t = dest[j];
					dest[j] = dest[k];
					dest[k] = t;
				}
			return;
		}

		int mid = (low + high) >>> 1;
		sort(dest, src, low, mid);
		sort(dest, src, mid, high);

		for (int i = low, p = low, q = mid; i < high; i++) {
			if (q >= high || p < mid && (src[p].weight <= src[q].weight))
				dest[i] = src[p++];
			else
				dest[i] = src[q++];
		}
	}
}