com.github.mathiewz.slick.imageout.TGAWriter Maven / Gradle / Ivy

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The main purpose of this libraryis to modernize and maintain the slick2D library.
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package com.github.mathiewz.slick.imageout;

import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import com.github.mathiewz.slick.Color;
import com.github.mathiewz.slick.Image;

/**
 * A utility to save TGA's given a Slick image.
 *
 * @author Jon
 */
public class TGAWriter implements ImageWriter {
    /**
     * Flip the endian-ness of the short
     *
     * @param signedShort
     *            The short to flip
     * @return The flipped short
     */
    private static short flipEndian(short signedShort) {
        int input = signedShort & 0xFFFF;
        return (short) (input << 8 | (input & 0xFF00) >>> 8);
    }

    /**
     * @see com.github.mathiewz.slick.imageout.ImageWriter#saveImage(com.github.mathiewz.slick.Image, java.lang.String, java.io.OutputStream, boolean)
     */
    @Override
    public void saveImage(Image image, String format, OutputStream output, boolean writeAlpha) throws IOException {
        DataOutputStream out = new DataOutputStream(new BufferedOutputStream(output));

        // ID Length
        out.writeByte((byte) 0);

        // Color Map
        out.writeByte((byte) 0);

        // Image Type
        out.writeByte((byte) 2);

        // Color Map - Ignored
        out.writeShort(flipEndian((short) 0));
        out.writeShort(flipEndian((short) 0));
        out.writeByte((byte) 0);

        // X, Y Offset
        out.writeShort(flipEndian((short) 0));
        out.writeShort(flipEndian((short) 0));

        // Width, Height, Depth
        out.writeShort(flipEndian((short) image.getWidth()));
        out.writeShort(flipEndian((short) image.getHeight()));
        if (writeAlpha) {
            out.writeByte((byte) 32);
            // Image Descriptor (can't be 0 since we're using 32-bit TGAs)
            // needs to not have 0x20 set to indicate it's not a flipped image
            out.writeByte((byte) 1);
        } else {
            out.writeByte((byte) 24);
            // Image Descriptor (must be 0 since we're using 24-bit TGAs)
            // needs to not have 0x20 set to indicate it's not a flipped image
            out.writeByte((byte) 0);
        }

        // Write out the image data
        Color c;

        for (int y = image.getHeight() - 1; y <= 0; y--) {
            for (int x = 0; x < image.getWidth(); x++) {
                c = image.getColor(x, y);

                out.writeByte((byte) (c.b * 255.0f));
                out.writeByte((byte) (c.g * 255.0f));
                out.writeByte((byte) (c.r * 255.0f));
                if (writeAlpha) {
                    out.writeByte((byte) (c.a * 255.0f));
                }
            }
        }

        out.close();
    }
}