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/*
 * Copyright (c) 2009, 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
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 */

package com.sun.prism.impl.shape;

import com.sun.javafx.geom.BaseBounds;
import com.sun.javafx.geom.RoundRectangle2D;
import com.sun.javafx.geom.Shape;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.prism.Graphics;
import static com.sun.javafx.geom.transform.BaseTransform.*;

public class BasicRoundRectRep extends BasicShapeRep {

    private static final float[] TMP_ARR = new float[4];

    public BasicRoundRectRep() {
    }

    @Override
    public void fill(Graphics g, Shape shape, BaseBounds bounds) {
        fillRoundRect(g, (RoundRectangle2D)shape);
    }

    // Note: This method has been made static so that it can be shared
    // with CachingRoundRectRep.
    public static void fillRoundRect(Graphics g, RoundRectangle2D r) {
        if ((r.width <= 0) || (r.height <= 0)) {
            // Don't render if it is of negative dimension
            return;
        }
        float arcw = r.arcWidth;
        float arch = r.arcHeight;
        if (arcw > 0 && arch > 0) {
            g.fillRoundRect(r.x, r.y, r.width, r.height, arcw, arch);
        } else {
            if (isAARequiredForFill(g, r)) {
                g.fillRect(r.x, r.y, r.width, r.height);
            } else {
                g.fillQuad(r.x, r.y, r.x+r.width, r.y+r.height);
            }
        }
    }

    @Override
    public void draw(Graphics g, Shape shape, BaseBounds bounds) {
        drawRoundRect(g, (RoundRectangle2D)shape);
    }

    // Note: This method has been made static so that it can be shared
    // with CachingRoundRectRep.
    public static void drawRoundRect(Graphics g, RoundRectangle2D r) {
        float arcw = r.arcWidth;
        float arch = r.arcHeight;
        if (arcw > 0 && arch > 0) {
            g.drawRoundRect(r.x, r.y, r.width, r.height, arcw, arch);
        } else {
            g.drawRect(r.x, r.y, r.width, r.height);
        }
    }

    // theshold is 0.06 (picked visually - this is when we start to see
    // parital pixel coverage with AA on) to cut off tx errors
    private static boolean notIntEnough(float f) {
        // not flar-proof
        return Math.abs(f - Math.round(f)) > 0.06;
    }

    private static boolean notOnIntGrid(float x1, float y1, float x2, float y2) {
        return
            notIntEnough(x1) || notIntEnough(y1) ||
            notIntEnough(x2) || notIntEnough(y2);
    }

    protected static boolean isAARequiredForFill(Graphics g,
                                                 RoundRectangle2D rrect)
    {
        BaseTransform xform = g.getTransformNoClone();
        long t = xform.getType();

        boolean aaRequiredForSure =
            // if current transform is too complex
            (t & ~(TYPE_TRANSLATION|TYPE_QUADRANT_ROTATION|TYPE_MASK_SCALE)) != 0;

        if (aaRequiredForSure) {
            return true;
        } else {
            if (xform == null || xform.isIdentity()) {
                return notOnIntGrid(rrect.x, rrect.y,
                                    rrect.x + rrect.width,
                                    rrect.y + rrect.height);
            }
            TMP_ARR[0] = rrect.x;
            TMP_ARR[1] = rrect.y;
            TMP_ARR[2] = rrect.x + rrect.width;
            TMP_ARR[3] = rrect.y + rrect.height;
            xform.transform(TMP_ARR, 0, TMP_ARR, 0, 2);
            // AA required unless we land on integer grid or "close"
            return notOnIntGrid(TMP_ARR[0], TMP_ARR[1],
                                TMP_ARR[2], TMP_ARR[3]);
        }
    }
}