Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\font\directwrite\DWFontStrike.java

/*
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.javafx.font.directwrite;

import com.sun.javafx.font.DisposerRecord;
import com.sun.javafx.font.FontResource;
import com.sun.javafx.font.FontStrikeDesc;
import com.sun.javafx.font.Glyph;
import com.sun.javafx.font.PrismFontFactory;
import com.sun.javafx.font.PrismFontStrike;
import com.sun.javafx.geom.Path2D;
import com.sun.javafx.geom.Point2D;
import com.sun.javafx.geom.RectBounds;
import com.sun.javafx.geom.transform.BaseTransform;

class DWFontStrike extends PrismFontStrike<DWFontFile> {
    DWRITE_MATRIX matrix;
    static final boolean SUBPIXEL_ON;
    static final boolean SUBPIXEL_Y;
    static final boolean SUBPIXEL_NATIVE;
    static {
        int mode = PrismFontFactory.getFontFactory().getSubPixelMode();
        SUBPIXEL_ON = (mode & PrismFontFactory.SUB_PIXEL_ON) != 0;
        SUBPIXEL_Y = (mode & PrismFontFactory.SUB_PIXEL_Y) != 0;
        SUBPIXEL_NATIVE = (mode & PrismFontFactory.SUB_PIXEL_NATIVE) != 0;
    }

DWFontStrike(DWFontFile fontResource, float size, BaseTransform tx,
                 int aaMode, FontStrikeDesc desc) {
        super(fontResource, size, tx, aaMode, desc);
        float maxDim = PrismFontFactory.getFontSizeLimit();
        if (tx.isTranslateOrIdentity()) {
            drawShapes = size > maxDim;
        } else {
            BaseTransform tx2d = getTransform();
            matrix = new DWRITE_MATRIX();
            matrix.m11 = (float)tx2d.getMxx();
            matrix.m12 = (float)tx2d.getMyx();
            matrix.m21 = (float)tx2d.getMxy();
            matrix.m22 = (float)tx2d.getMyy();

if (Math.abs(matrix.m11 * size) > maxDim ||
                Math.abs(matrix.m12 * size) > maxDim ||
                Math.abs(matrix.m21 * size) > maxDim ||
                Math.abs(matrix.m22 * size) > maxDim)
            {
              drawShapes = true;
            }
        }
    }

@Override protected DisposerRecord createDisposer(FontStrikeDesc desc) {
        return null;
    }

@Override
    public int getQuantizedPosition(Point2D point) {
        if (SUBPIXEL_ON && (matrix == null || SUBPIXEL_NATIVE)) {
            /* Using DirectWrite to produce subpixel glyph masks for grayscale
             * text and (by default) let Prism produce subpixel glyphs for LCD
             * using shaders (thus, saving texture and memory).
             */
            if (getAAMode() == FontResource.AA_GREYSCALE || SUBPIXEL_NATIVE) {
                float subPixel = point.x;
                point.x = (int)point.x;
                subPixel -= point.x;
                int index = 0;
                if (subPixel >= 0.66f) {
                    index = 2;
                } else if (subPixel >= 0.33f) {
                    index = 1;
                }
                if (SUBPIXEL_Y) {
                    subPixel = point.y;
                    point.y = (int)point.y;
                    subPixel -= point.y;
                    if (subPixel >= 0.66f) {
                        index += 6;
                    } else if (subPixel >= 0.33f) {
                        index += 3;
                    }
                } else {
                    point.y = (float)Math.round(point.y);
                }
                return index;
            }
        }
        return super.getQuantizedPosition(point);
    }

IDWriteFontFace getFontFace() {
        DWFontFile fontResource = getFontResource();
        return fontResource.getFontFace();
    }

RectBounds getBBox(int glyphCode) {
        DWFontFile fontResource = getFontResource();
        return fontResource.getBBox(glyphCode, getSize());
    }

int getUpem() {
        return getFontResource().getUnitsPerEm();
    }

@Override protected Path2D createGlyphOutline(int glyphCode) {
        DWFontFile fontResource = getFontResource();
        return fontResource.getGlyphOutline(glyphCode, getSize());
    }

@Override protected Glyph createGlyph(int glyphCode) {
        return new DWGlyph(this, glyphCode, drawShapes);
    }
}

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