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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.javafx.font.coretext;

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.transform.BaseTransform;

class CTFontStrike extends PrismFontStrike {

    private long fontRef;
    CGAffineTransform matrix, imatrix;
    boolean subPixel = false;
    private static final boolean SUBPIXEL;
    static {
        SUBPIXEL = PrismFontFactory.getFontFactory().isSubPixelEnabled();
    }

    CTFontStrike(CTFontFile fontResource, float size,
                 BaseTransform graphicsTransform, int aaMode,
                 FontStrikeDesc desc) {
        super(fontResource, size, graphicsTransform, aaMode, desc);
        float maxDim = 80f;
        if (graphicsTransform.isTranslateOrIdentity()) {
            drawShapes = size > maxDim;
        } else {
            BaseTransform tx2d = getTransform();
            matrix = new CGAffineTransform();
            matrix.a = tx2d.getMxx();
            matrix.b = -tx2d.getMyx(); /*Inverted coordinates system */
            matrix.c = -tx2d.getMxy(); /*Inverted coordinates system */
            matrix.d = tx2d.getMyy();

            imatrix = OS.CGAffineTransformInvert(matrix);

            if (Math.abs(matrix.a * size) > maxDim ||
                Math.abs(matrix.b * size) > maxDim ||
                Math.abs(matrix.c * size) > maxDim ||
                Math.abs(matrix.d * size) > maxDim)
            {
              drawShapes = true;
            }
        }
        long psNameRef = OS.CFStringCreate(fontResource.getPSName());
        fontRef = OS.CTFontCreateWithName(psNameRef, size, matrix);
        OS.CFRelease(psNameRef);

        /* CoreText uses different precision for subpixel text according
         * to the font size. By observation, font sizes smaller than 12
         * have 4 subpixel positions. Between 12 and 17 it decreases to 3.
         * Between 18 and 33 it is only 2. Above 33 it rounds all positions
         * to integral values.
         */
        if (SUBPIXEL && matrix == null) {
            if (getAAMode() == FontResource.AA_LCD) {
                /* Prism support 3 subpixel positions for LCD text and it is better
                 * to use Prism when possible to save texture space in the glyph
                 * cache.
                 */
                subPixel = getSize() < 12;
            } else {
                /* Prism has no subpixel support for grayscale text. */
                subPixel = getSize() < 18;
            }
        }
    }

    long getFontRef() {
        return fontRef;
    }

    @Override protected DisposerRecord createDisposer(FontStrikeDesc desc) {
        CTFontFile fontResource = getFontResource();
        return new CTStrikeDisposer(fontResource, desc, fontRef);
    }

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

    @Override public boolean isSubPixelGlyph() {
        return subPixel;
    }

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

    CGRect getBBox(int glyphCode) {
        CTFontFile fontResource = getFontResource();
        return fontResource.getBBox(glyphCode, getSize());
    }
}