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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 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.prism.image;

import com.sun.prism.Graphics;
import com.sun.prism.ResourceFactory;
import com.sun.prism.Texture;

public class CompoundCoords {
    // position in the sub-Image matrix
    private int xImg0, xImg1;
    private int yImg0, yImg1;
    private Coords tileCoords[];

    public CompoundCoords(CompoundImage t, Coords crd) {
        int xImg0 = find1(fastFloor(crd.u0), t.uSubdivision);
        int xImg1 = find2(fastCeil(crd.u1),  t.uSubdivision);
        int yImg0 = find1(fastFloor(crd.v0), t.vSubdivision);
        int yImg1 = find2(fastCeil(crd.v1),  t.vSubdivision);

        // exit if uv`s are outside of the grid
        if (xImg0 < 0 || xImg1 < 0 || yImg0 < 0 || yImg1 < 0) return;

        this.xImg0 = xImg0;  this.xImg1 = xImg1;
        this.yImg0 = yImg0;  this.yImg1 = yImg1;
        tileCoords = new Coords[(xImg1 - xImg0 + 1) * (yImg1 - yImg0 + 1)];

        float xMedian[] = new float[xImg1-xImg0];
        float yMedian[] = new float[yImg1-yImg0];

        for (int x = xImg0; x < xImg1; ++x) {
            xMedian[x - xImg0] = crd.getX(t.uSubdivision[x + 1]);
        }
        for (int y = yImg0; y < yImg1; ++y) {
            yMedian[y - yImg0] = crd.getY(t.vSubdivision[y + 1]);
        }

        int idx = 0;
        for (int y = yImg0; y <= yImg1; ++y) {
            float v0 = (y == yImg0 ? crd.v0 : t.vSubdivision[y]) - t.v0[y];
            float v1 = (y == yImg1 ? crd.v1 : t.vSubdivision[y + 1]) - t.v0[y];
            float y0 = y == yImg0 ? crd.y0 : yMedian[y - yImg0 - 1];
            float y1 = y == yImg1 ? crd.y1 : yMedian[y - yImg0];

            for (int x = xImg0; x <= xImg1; ++x) {
                Coords segment = new Coords();
                segment.v0 = v0;
                segment.v1 = v1;
                segment.y0 = y0;
                segment.y1 = y1;

                segment.u0 = (x == xImg0 ? crd.u0 : t.uSubdivision[x]) - t.u0[x];
                segment.u1 = (x == xImg1 ? crd.u1 : t.uSubdivision[x + 1]) - t.u0[x];
                segment.x0 = x == xImg0 ? crd.x0 : xMedian[x - xImg0-1];
                segment.x1 = x == xImg1 ? crd.x1 : xMedian[x - xImg0];

                tileCoords[idx++] = segment;
            }
        }
    }

    public void draw(Graphics g, CompoundImage t, float xS, float yS) {
        if (tileCoords == null) return;

        ResourceFactory factory = g.getResourceFactory();

        int idx = 0;
        for (int y = yImg0; y <= yImg1; ++y) {
            for (int x = xImg0; x <= xImg1; ++x) {
                Texture tex = t.getTile(x, y, factory);
                tileCoords[idx++].draw(tex, g, xS, yS);
                tex.unlock();
            }
        }
    }

    // find n that : array[n] <= x < array[n+1]
    private static int find1(int x, int array[]) {
        // RT-27419
        // TODO: we may use b-search, probably later
        // since the length is really small, plain 'for' is OK for now
        for (int i = 0; i < array.length - 1; ++i) {
            if (array[i] <= x && x < array[i + 1]) {
                return i;
            }
        }
        return -1;
    }

    // find n that : array[n] < x <= array[n+1]
    private static int find2(int x, int array[]) {
        // RT-27419
        // TODO: we may use b-search, probably later
        // since the length is really small, plain 'for' is OK for now
        for (int i = 0; i < array.length - 1; ++i) {
            if (array[i] < x && x <= array[i + 1]) {
                return i;
            }
        }
        return -1;
    }

    private static int fastFloor(float x) {
        int ix = (int) x;
        return (ix <= x) ? ix : ix - 1;
    }

    private static int fastCeil(float x) {
        int ix = (int) x;
        return (ix >= x) ? ix : ix + 1;
    }
}