/*
 * Copyright (c) 2010, 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 sun.java2d.xr;

import java.awt.*;
import java.awt.MultipleGradientPaint.*;
import java.awt.geom.*;
import java.awt.image.*;
import sun.java2d.*;
import sun.java2d.loops.*;
import sun.java2d.xr.XRSurfaceData.XRInternalSurfaceData;

abstract class XRPaints {
    static XRCompositeManager xrCompMan;

    static final XRGradient xrGradient = new XRGradient();
    static final XRLinearGradient xrLinearGradient = new XRLinearGradient();
    static final XRRadialGradient xrRadialGradient = new XRRadialGradient();
    static final XRTexture xrTexture = new XRTexture();

    public static void register(XRCompositeManager xrComp) {
        xrCompMan = xrComp;
    }

    private static XRPaints getXRPaint(SunGraphics2D sg2d) {
        switch (sg2d.paintState) {
        case SunGraphics2D.PAINT_GRADIENT:
            return xrGradient;

        case SunGraphics2D.PAINT_LIN_GRADIENT:
            return xrLinearGradient;

        case SunGraphics2D.PAINT_RAD_GRADIENT:
            return xrRadialGradient;

        case SunGraphics2D.PAINT_TEXTURE:
            return xrTexture;

        default:
            return null;
        }
    }

    
Attempts to locate an implementation corresponding to the paint state of
the provided SunGraphics2D object. If no implementation can be found, or
if the paint cannot be accelerated under the conditions of the
SunGraphics2D, this method returns false; otherwise, returns true.
/**
     * Attempts to locate an implementation corresponding to the paint state of
     * the provided SunGraphics2D object. If no implementation can be found, or
     * if the paint cannot be accelerated under the conditions of the
     * SunGraphics2D, this method returns false; otherwise, returns true.
     */
    static boolean isValid(SunGraphics2D sg2d) {
        XRPaints impl = getXRPaint(sg2d);
        return (impl != null && impl.isPaintValid(sg2d));
    }

    static void setPaint(SunGraphics2D sg2d, Paint paint) {
        XRPaints impl = getXRPaint(sg2d);
        if (impl != null) {
            impl.setXRPaint(sg2d, paint);
        }
    }

    
Returns true if this implementation is able to accelerate the Paint
object associated with, and under the conditions of, the provided
SunGraphics2D instance; otherwise returns false.
/**
     * Returns true if this implementation is able to accelerate the Paint
     * object associated with, and under the conditions of, the provided
     * SunGraphics2D instance; otherwise returns false.
     */
    abstract boolean isPaintValid(SunGraphics2D sg2d);

    abstract void setXRPaint(SunGraphics2D sg2d, Paint paint);

    private static class XRGradient extends XRPaints {
        private XRGradient() {
        }

        
There are no restrictions for accelerating GradientPaint, so this
method always returns true.
/**
         * There are no restrictions for accelerating GradientPaint, so this
         * method always returns true.
         */
        @Override
        boolean isPaintValid(SunGraphics2D sg2d) {
            return true;
        }

        void setXRPaint(SunGraphics2D sg2d, Paint pt) {
            GradientPaint paint = (GradientPaint) pt;

            int repeat = paint.isCyclic() ? XRUtils.RepeatReflect : XRUtils.RepeatPad;
            float fractions[] = {0, 1};
            int[] pixels = convertToIntArgbPixels(new Color[] { paint.getColor1(), paint.getColor2() });

            Point2D pt1 = paint.getPoint1();
            Point2D pt2 = paint.getPoint2();

            XRBackend con = xrCompMan.getBackend();
            int gradient = con.createLinearGradient(pt1, pt2, fractions, pixels, repeat);
            xrCompMan.setGradientPaint(new XRSurfaceData.XRInternalSurfaceData(con, gradient));
        }
    }

    public int getGradientLength(Point2D pt1, Point2D pt2) {
           double xDiff = Math.max(pt1.getX(), pt2.getX()) - Math.min(pt1.getX(), pt2.getX());
           double yDiff = Math.max(pt1.getY(), pt2.getY()) - Math.min(pt1.getY(), pt2.getY());
           return (int) Math.ceil(Math.sqrt(xDiff*xDiff + yDiff*yDiff));
    }

    private static class XRLinearGradient extends XRPaints {

        @Override
        boolean isPaintValid(SunGraphics2D sg2d) {
            return ((LinearGradientPaint) sg2d.getPaint()).getColorSpace() == ColorSpaceType.SRGB;
        }

        @Override
        void setXRPaint(SunGraphics2D sg2d, Paint pt) {
            LinearGradientPaint paint = (LinearGradientPaint) pt;

            Color[] colors = paint.getColors();
            Point2D pt1 = paint.getStartPoint();
            Point2D pt2 = paint.getEndPoint();

            int repeat = XRUtils.getRepeatForCycleMethod(paint.getCycleMethod());
            float[] fractions = paint.getFractions();
            int[] pixels = convertToIntArgbPixels(colors);

            AffineTransform at = paint.getTransform();
            try {
                at.invert();
            } catch (NoninvertibleTransformException ex) {
                ex.printStackTrace();
            }

            XRBackend con = xrCompMan.getBackend();
            int gradient = con.createLinearGradient(pt1, pt2, fractions, pixels, repeat);
            XRInternalSurfaceData x11sd = new XRSurfaceData.XRInternalSurfaceData(con, gradient);
            x11sd.setStaticSrcTx(at);
            xrCompMan.setGradientPaint(x11sd);
        }
    }

    private static class XRRadialGradient extends XRPaints {

        @Override
        boolean isPaintValid(SunGraphics2D sg2d) {
            RadialGradientPaint grad = (RadialGradientPaint) sg2d.paint;
            return grad.getFocusPoint().equals(grad.getCenterPoint())
                   && grad.getColorSpace() == ColorSpaceType.SRGB;
        }

        @Override
        void setXRPaint(SunGraphics2D sg2d, Paint pt) {
            RadialGradientPaint paint = (RadialGradientPaint) pt;
            Color[] colors = paint.getColors();
            Point2D center = paint.getCenterPoint();

            int repeat = XRUtils.getRepeatForCycleMethod(paint.getCycleMethod());
            float[] fractions = paint.getFractions();
            int[] pixels = convertToIntArgbPixels(colors);
            float radius = paint.getRadius();

            float cx = (float) center.getX();
            float cy = (float) center.getY();

            AffineTransform at = paint.getTransform();
            try {
                at.invert();
            } catch (NoninvertibleTransformException ex) {
                ex.printStackTrace();
            }

            XRBackend con = xrCompMan.getBackend();
            int gradient = con.createRadialGradient(cx, cy, 0, radius, fractions, pixels, repeat);
            XRInternalSurfaceData x11sd = new XRSurfaceData.XRInternalSurfaceData(con, gradient);
            x11sd.setStaticSrcTx(at);
            xrCompMan.setGradientPaint(x11sd);
        }
    }

    private static class XRTexture extends XRPaints {

        private XRSurfaceData getAccSrcSurface(XRSurfaceData dstData, BufferedImage bi) {
            // REMIND: this is a hack that attempts to cache the system
            // memory image from the TexturePaint instance into an
            // XRender pixmap...
            SurfaceData srcData = dstData.getSourceSurfaceData(bi, SunGraphics2D.TRANSFORM_ISIDENT, CompositeType.SrcOver, null);
            if (!(srcData instanceof XRSurfaceData)) {
                srcData = dstData.getSourceSurfaceData(bi, SunGraphics2D.TRANSFORM_ISIDENT, CompositeType.SrcOver, null);
                if (!(srcData instanceof XRSurfaceData)) {
                    throw new InternalError("Surface not cachable");
                }
            }

            return (XRSurfaceData) srcData;
        }

        @Override
        boolean isPaintValid(SunGraphics2D sg2d) {
            TexturePaint paint = (TexturePaint) sg2d.paint;
            BufferedImage bi = paint.getImage();
            XRSurfaceData dstData = (XRSurfaceData) sg2d.getDestSurface();

            return getAccSrcSurface(dstData, bi) != null;
        }

        @Override
        void setXRPaint(SunGraphics2D sg2d, Paint pt) {
            TexturePaint paint = (TexturePaint) pt;
            BufferedImage bi = paint.getImage();
            Rectangle2D anchor = paint.getAnchorRect();

            XRSurfaceData dstData = (XRSurfaceData) sg2d.surfaceData;
            XRSurfaceData srcData = (XRSurfaceData) getAccSrcSurface(dstData, bi);

            AffineTransform at = new AffineTransform();
            at.translate(anchor.getX(), anchor.getY());
            at.scale(anchor.getWidth() / ((double) bi.getWidth()), anchor.getHeight() / ((double) bi.getHeight()));

            try {
                at.invert();
            } catch (NoninvertibleTransformException ex) {
                at.setToIdentity();
            }
            srcData.setStaticSrcTx(at);

            srcData.validateAsSource(at, XRUtils.RepeatNormal, XRUtils.ATransOpToXRQuality(sg2d.interpolationType));
            xrCompMan.setTexturePaint(srcData);
        }
    }

    public int[] convertToIntArgbPixels(Color[] colors) {
        int[] pixels = new int[colors.length];
        for (int i = 0; i < colors.length; i++) {
            pixels[i] = colorToIntArgbPixel(colors[i]);
        }
        return pixels;
    }

    public int colorToIntArgbPixel(Color c) {
        int rgb = c.getRGB();
        int a = (int) Math.round(xrCompMan.getExtraAlpha() * (rgb >>> 24));
        return ((a << 24) | (rgb & 0x00FFFFFF));
    }
}