org.jpedal.fonts.tt.hinting.Cvt Maven / Gradle / Ivy

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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * Cvt.java
 * ---------------
 */
package org.jpedal.fonts.tt.hinting;

import org.jpedal.fonts.tt.FontFile2;
import org.jpedal.fonts.tt.Table;
import org.jpedal.utils.LogWriter;


public class Cvt extends Table {

    final short[] unscaledCvt;

    final int[] cvt;
    double scale;

    /**
     * debug message on first time we show message Cvt.get(): Key out of range.
     */
    private static boolean messageDisplayed;

    Cvt(final FontFile2 currentFontFile) {

        //LogWriter.writeMethod("{readCvtTable}", 0);

        //move to start and check exists
        final int startPointer = currentFontFile.selectTable(FontFile2.CVT);

        //read table
        if (startPointer != 0) {
            final int len = currentFontFile.getOffset(FontFile2.CVT) / 2;
            unscaledCvt = new short[len];
            cvt = new int[len];
            for (int i = 0; i < len; i++) {
                unscaledCvt[i] = currentFontFile.getFWord();
            }

        } else {
            unscaledCvt = new short[]{};
            cvt = new int[]{};
        }
    }


    /**
     * Scales the CVT to match the font
     *
     * @param scale The new scale
     */
    public void scale(final double scale) {
        this.scale = scale;
        for (int i = 0; i < unscaledCvt.length; i++) {
            cvt[i] = (int) ((scale * unscaledCvt[i]) + 0.5);
        }
    }

    /**
     * Put a new value in the table in pixels (already scaled)
     *
     * @param key   Which value to replace
     * @param value The (scaled) value
     */
    public void putInPixels(final int key, final int value) {
        if (key >= 0 && key < cvt.length) {
            cvt[key] = value;
        } else if (LogWriter.isRunningFromIDE) {
            System.err.println("Cvt.putInPixels(): Key out of range. (" + key + ')');
        }
    }

    /**
     * Put a new value in the table in FUnits (needs scaling)
     *
     * @param key   Which value to replace
     * @param value The (unscaled) value
     */
    public void putInFUnits(final int key, int value) {
        value = (int) ((value * scale) + 0.5);
        if (key >= 0 && key < cvt.length) {
            cvt[key] = value;
        } else if (LogWriter.isRunningFromIDE) {
            System.err.println("Cvt.putInFUnits(): Key out of range. (" + key + ')');
        }
    }

    /**
     * Get a value
     *
     * @param key The value to get
     * @return The (scaled) value
     */
    public int get(final int key) {
        if (key >= 0 && key < cvt.length) {
            return cvt[key];
        } else if (!messageDisplayed && LogWriter.isRunningFromIDE) { //only for first case
            System.err.println("Cvt.get(): Key out of range. (" + key + ')');
            messageDisplayed = true;
        }

        return 0;
    }

    String[] getCVTForDebug() {
        final String[] result = new String[cvt.length];
        for (int i = 0; i < cvt.length; i++) {
            result[i] = i + ": " + cvt[i] + "       (" + java.text.NumberFormat.getNumberInstance().format(cvt[i] / 64d) + ')';
        }
        return result;
    }
}