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package com.sun.prism.impl.shape;

import com.sun.javafx.geom.RectBounds;
import com.sun.javafx.geom.Path2D;
import com.sun.javafx.geom.Rectangle;
import com.sun.javafx.geom.Shape;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.openpisces.AlphaConsumer;
import com.sun.openpisces.Renderer;
import com.sun.prism.BasicStroke;
import com.sun.prism.impl.PrismSettings;
import java.nio.ByteBuffer;

public class OpenPiscesRasterizer implements ShapeRasterizer {
    private static MaskData emptyData = MaskData.create(new byte[1], 0, 0, 1, 1);

    private static Consumer savedConsumer;

    @Override
    public MaskData getMaskData(Shape shape,
                                BasicStroke stroke,
                                RectBounds xformBounds,
                                BaseTransform xform,
                                boolean close, boolean antialiasedShape)
    {
        if (stroke != null && stroke.getType() != BasicStroke.TYPE_CENTERED) {
            // RT-27427
            // TODO: Optimize the combinatorial strokes for simple
            // shapes and/or teach the rasterizer to be able to
            // do a "differential fill" between two shapes.
            // Note that most simple shapes will use a more optimized path
            // than this method for the INNER/OUTER strokes anyway.
            shape = stroke.createStrokedShape(shape);
            stroke = null;
        }
        if (xformBounds == null) {
            if (stroke != null) {
                // Note that all places that pass null for xformbounds also
                // pass null for stroke so that the following is not typically
                // executed, but just here as a safety net.
                shape = stroke.createStrokedShape(shape);
                stroke = null;
            }

            xformBounds = new RectBounds();
            //TODO: Need to verify that this is a safe cast ... (RT-27427)
            xformBounds = (RectBounds) xform.transform(shape.getBounds(), xformBounds);
        }
        Rectangle rclip = new Rectangle(xformBounds);
        if (rclip.isEmpty()) {
            return emptyData;
        }
        Renderer renderer = null;
        if (shape instanceof Path2D) {
            renderer = OpenPiscesPrismUtils.setupRenderer((Path2D) shape, stroke, xform, rclip,
                    antialiasedShape);
        }
        if (renderer == null) {
            renderer = OpenPiscesPrismUtils.setupRenderer(shape, stroke, xform, rclip,
                    antialiasedShape);
        }
        int outpix_xmin = renderer.getOutpixMinX();
        int outpix_ymin = renderer.getOutpixMinY();
        int outpix_xmax = renderer.getOutpixMaxX();
        int outpix_ymax = renderer.getOutpixMaxY();
        int w = outpix_xmax - outpix_xmin;
        int h = outpix_ymax - outpix_ymin;
        if (w <= 0 || h <= 0) {
            return emptyData;
        }

        Consumer consumer = savedConsumer;
        if (consumer == null || w * h > consumer.getAlphaLength()) {
            int csize = (w * h + 0xfff) & (~0xfff);
            savedConsumer = consumer = new Consumer(csize);
            if (PrismSettings.verbose) {
                System.out.println("new alphas");
            }
        }
        consumer.setBoundsNoClone(outpix_xmin, outpix_ymin, w, h);
        renderer.produceAlphas(consumer);
        return consumer.getMaskData();
    }

    private static class Consumer implements AlphaConsumer {
        static byte savedAlphaMap[];
        int x, y, width, height;
        byte alphas[];
        byte alphaMap[];
        ByteBuffer alphabuffer;
        MaskData maskdata = new MaskData();

        public Consumer(int alphalen) {
            this.alphas = new byte[alphalen];
            alphabuffer = ByteBuffer.wrap(alphas);
        }

        public void setBoundsNoClone(int x, int y, int w, int h) {
            this.x = x;
            this.y = y;
            this.width = w;
            this.height = h;
            maskdata.update(alphabuffer, x, y, w, h);
        }

        @Override
        public int getOriginX() {
            return x;
        }

        @Override
        public int getOriginY() {
            return y;
        }

        @Override
        public int getWidth() {
            return width;
        }

        @Override
        public int getHeight() {
            return height;
        }

        public byte[] getAlphasNoClone() {
            return alphas;
        }

        public int getAlphaLength() {
            return alphas.length;
        }

        public MaskData getMaskData() {
            return maskdata;
        }

        @Override
        public void setMaxAlpha(int maxalpha) {
            byte map[] = savedAlphaMap;
            if (map == null || map.length != maxalpha+1) {
                map = new byte[maxalpha+1];
                for (int i = 0; i <= maxalpha; i++) {
                    map[i] = (byte) ((i*255 + maxalpha/2)/maxalpha);
                }
                savedAlphaMap = map;
            }
            this.alphaMap = map;
        }

        @Override
        public void setAndClearRelativeAlphas(int[] alphaRow, int pix_y,
                                              int pix_from, int pix_to)
        {
//            System.out.println("setting row "+(pix_y - y)+
//                               " out of "+width+" x "+height);
            int w = width;
            int off = (pix_y - y) * w;
            byte out[] = this.alphas;
            byte map[] = this.alphaMap;
            int a = 0;
            for (int i = 0; i < w; i++) {
                a += alphaRow[i];
                alphaRow[i] = 0;
                out[off+i] = map[a];
            }
        }

        public void setAndClearRelativeAlphas2(int[] alphaDeltas, int pix_y,
                                               int pix_from, int pix_to)
        {
            if (pix_to >= pix_from) {
                byte out[] = this.alphas;
                byte map[] = this.alphaMap;
                int from = pix_from - x;
                int to = pix_to - x;
                int w = width;
                int off = (pix_y - y) * w;

                int i = 0;
                while (i < from) {
                    out[off+i] = 0;
                    i++;
                }
                int curAlpha = 0;
                while (i <= to) {
                    curAlpha += alphaDeltas[i];
                    alphaDeltas[i] = 0;
                    byte a = map[curAlpha];
                    out[off+i] = a;
                    i++;
                }
                alphaDeltas[i] = 0;
                while (i < w) {
                    out[off+i] = 0;
                    i++;
                }
            } else {
                java.util.Arrays.fill(alphaDeltas, 0);
            }
        }
    }
}