DDSMetadata.java

/*
 * Copyright (c) 2024, 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 of the copyright holder 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 HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 */

package com.twelvemonkeys.imageio.plugins.dds;

import javax.imageio.ImageTypeSpecifier;

import com.twelvemonkeys.imageio.StandardImageMetadataSupport;

final class DDSMetadata extends StandardImageMetadataSupport {
    DDSMetadata(ImageTypeSpecifier type, DDSHeader header) {
        super(builder(type)
                      .withCompressionTypeName(compressionName(header))
                      .withFormatVersion("1.0")
        );
    }

    private static String compressionName(DDSHeader header) {
        // If the fourCC is valid, compression is one of the DXTn versions, otherwise None
        int flags = header.getPixelFormatFlags();

        if ((flags & DDS.PIXEL_FORMAT_FLAG_FOURCC) != 0) {
            // DXTn
            DDSType type = DDSType.valueOf(header.getFourCC());

            return type.name();
        }

        return "None";
    }
}