/*
 * Copyright (c) 2014, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name "TwelveMonkeys" nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.imageio.plugins.psd;

import javax.imageio.stream.ImageInputStream;
import java.io.IOException;

/**
 * PSDGlobalLayerMask
 *
 * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
 * @author last modified by $Author: haraldk$
 * @version $Id: PSDGlobalLayerMask.java,v 1.0 May 8, 2008 5:33:48 PM haraldk Exp$
 */
final class PSDGlobalLayerMask {
    final int colorSpace;
    final short[] colors = new short[4];
    final int opacity;
    final int kind;

    PSDGlobalLayerMask(final ImageInputStream pInput, final long globalLayerMaskLength) throws IOException {
        colorSpace = pInput.readUnsignedShort(); // Undocumented

        pInput.readFully(colors, 0, colors.length);

        opacity = pInput.readUnsignedShort(); // 0-100

        // Kind: 0: Selected (ie inverted), 1: Color protected, 128: Use value stored per layer (actually, the value is 80, not 0x80)
        kind = pInput.readUnsignedByte();

        // Skip "Variable: Filler zeros"
        pInput.skipBytes(globalLayerMaskLength - 17);
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder(getClass().getSimpleName());
        builder.append("[");
        builder.append("color space: 0x").append(Integer.toHexString(colorSpace));
        builder.append(", colors: [");

        for (int i = 0; i < colors.length; i++) {
            if (i > 0) {
                builder.append(", ");
            }

            builder.append("0x").append(Integer.toHexString(colors[i]));
        }

        builder.append("], opacity: ").append(opacity);
        builder.append(", kind: ").append(kind);
        builder.append("]");

        return builder.toString();
    }
}
