/*
 * Copyright (c) 2012, 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.image.impl;

import com.sun.javafx.image.AlphaType;
import com.sun.javafx.image.IntPixelAccessor;
import com.sun.javafx.image.IntPixelGetter;
import com.sun.javafx.image.IntPixelSetter;
import com.sun.javafx.image.IntToBytePixelConverter;
import com.sun.javafx.image.IntToIntPixelConverter;
import com.sun.javafx.image.PixelUtils;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;

public class IntArgb {
    public static final IntPixelGetter     getter = Accessor.instance;
    public static final IntPixelSetter     setter = Accessor.instance;
    public static final IntPixelAccessor accessor = Accessor.instance;

    public static final IntToBytePixelConverter ToByteBgraConverter =
        new IntTo4ByteSameConverter(IntArgb.getter, ByteBgra.setter);
    public static final IntToBytePixelConverter ToByteBgraPreConverter =
        IntArgb.ToByteBgraPreConv.instance;
    public static final IntToIntPixelConverter ToIntArgbConverter =
        BaseIntToIntConverter.create(accessor);
    public static final IntToIntPixelConverter ToIntArgbPreConverter =
        IntArgb.ToIntArgbPreConv.instance;

    static class Accessor implements IntPixelAccessor {
        static final IntPixelAccessor instance = new Accessor();
        private Accessor() {}

        @Override
        public AlphaType getAlphaType() {
            return AlphaType.NONPREMULTIPLIED;
        }

        @Override
        public int getNumElements() {
            return 1;
        }

        @Override
        public int getArgb(int arr[], int offset) {
            return arr[offset];
        }

        @Override
        public int getArgbPre(int arr[], int offset) {
            return PixelUtils.NonPretoPre(arr[offset]);
        }

        @Override
        public int getArgb(IntBuffer buffer, int offset) {
            return buffer.get(offset);
        }

        @Override
        public int getArgbPre(IntBuffer buffer, int offset) {
            return PixelUtils.NonPretoPre(buffer.get(offset));
        }

        @Override
        public void setArgb(int arr[], int offset, int argb) {
            arr[offset] = argb;
        }

        @Override
        public void setArgbPre(int arr[], int offset, int argbpre) {
            arr[offset] = PixelUtils.PretoNonPre(argbpre);
        }

        @Override
        public void setArgb(IntBuffer buffer, int offset, int argb) {
            buffer.put(offset, argb);
        }

        @Override
        public void setArgbPre(IntBuffer buffer, int offset, int argbpre) {
            buffer.put(offset, PixelUtils.PretoNonPre(argbpre));
        }
    }

    public static class ToIntArgbPreConv extends BaseIntToIntConverter {
        public static final IntToIntPixelConverter instance =
            new ToIntArgbPreConv();

        private ToIntArgbPreConv() {
            super(IntArgb.getter, IntArgbPre.setter);
        }

        @Override
        void doConvert(int srcarr[], int srcoff, int srcscanints,
                       int dstarr[], int dstoff, int dstscanints,
                       int w, int h)
        {
            srcscanints -= w;
            dstscanints -= w;
            while (--h >= 0) {
                for (int x = 0; x < w; x++) {
                    int pixel = srcarr[srcoff++];
                    int a = pixel >>> 24;
                    if (a < 0xff) {
                        if (a == 0) {
                            pixel = 0;
                        } else {
                            int r = (((pixel >> 16) & 0xff) * a + 0x7f) / 0xff;
                            int g = (((pixel >>  8) & 0xff) * a + 0x7f) / 0xff;
                            int b = (((pixel      ) & 0xff) * a + 0x7f) / 0xff;
                            pixel = (a << 24) | (r << 16) | (g << 8) | b;
                        }
                    }
                    dstarr[dstoff++] = pixel;
                }
                srcoff += srcscanints;
                dstoff += dstscanints;
            }
        }

        @Override
        void doConvert(IntBuffer srcbuf, int srcoff, int srcscanints,
                       IntBuffer dstbuf, int dstoff, int dstscanints,
                       int w, int h)
        {
            while (--h >= 0) {
                for (int x = 0; x < w; x++) {
                    int pixel = srcbuf.get(srcoff + x);
                    int a = pixel >>> 24;
                    if (a < 0xff) {
                        if (a == 0) {
                            pixel = 0;
                        } else {
                            int r = (((pixel >> 16) & 0xff) * a + 0x7f) / 0xff;
                            int g = (((pixel >>  8) & 0xff) * a + 0x7f) / 0xff;
                            int b = (((pixel      ) & 0xff) * a + 0x7f) / 0xff;
                            pixel = (a << 24) | (r << 16) | (g << 8) | b;
                        }
                    }
                    dstbuf.put(dstoff + x, pixel);
                }
                srcoff += srcscanints;
                dstoff += dstscanints;
            }
        }
    }

    static class ToByteBgraPreConv extends BaseIntToByteConverter {
        public static final IntToBytePixelConverter instance =
            new ToByteBgraPreConv();

        private ToByteBgraPreConv() {
            super(IntArgb.getter, ByteBgraPre.setter);
        }

        @Override
        void doConvert(int  srcarr[], int srcoff, int srcscanints,
                       byte dstarr[], int dstoff, int dstscanbytes,
                       int w, int h)
        {
            srcscanints -= w;
            dstscanbytes -= w * 4;
            while (--h >= 0) {
                for (int x = 0; x < w; x++) {
                    int pixel = srcarr[srcoff++];
                    int a = pixel >>> 24;
                    int r = pixel >>  16;
                    int g = pixel >>   8;
                    int b = pixel       ;
                    if (a < 0xff) {
                        if (a == 0) {
                            b = g = r = 0;
                        } else {
                            b = ((b & 0xff) * a + 0x7f) / 0xff;
                            g = ((g & 0xff) * a + 0x7f) / 0xff;
                            r = ((r & 0xff) * a + 0x7f) / 0xff;
                        }
                    }
                    dstarr[dstoff++] = (byte) b;
                    dstarr[dstoff++] = (byte) g;
                    dstarr[dstoff++] = (byte) r;
                    dstarr[dstoff++] = (byte) a;
                }
                srcoff += srcscanints;
                dstoff += dstscanbytes;
            }
        }

        @Override
        void doConvert(IntBuffer  srcbuf, int srcoff, int srcscanints,
                       ByteBuffer dstbuf, int dstoff, int dstscanbytes,
                       int w, int h)
        {
            dstscanbytes -= w * 4;
            while (--h >= 0) {
                for (int x = 0; x < w; x++) {
                    int pixel = srcbuf.get(srcoff + x);
                    int a = pixel >>> 24;
                    int r = pixel >>  16;
                    int g = pixel >>   8;
                    int b = pixel       ;
                    if (a < 0xff) {
                        if (a == 0) {
                            b = g = r = 0;
                        } else {
                            b = ((b & 0xff) * a + 0x7f) / 0xff;
                            g = ((g & 0xff) * a + 0x7f) / 0xff;
                            r = ((r & 0xff) * a + 0x7f) / 0xff;
                        }
                    }
                    dstbuf.put(dstoff    , (byte) b);
                    dstbuf.put(dstoff + 1, (byte) g);
                    dstbuf.put(dstoff + 2, (byte) r);
                    dstbuf.put(dstoff + 3, (byte) a);
                    dstoff += 4;
                }
                srcoff += srcscanints;
                dstoff += dstscanbytes;
            }
        }
    }
}
