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85 lines
1.9 KiB
85 lines
1.9 KiB
package mightypork.gamecore.backend.lwjgl;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import javax.imageio.ImageIO;
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import mightypork.gamecore.render.Screenshot;
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/**
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* Screenshot object, can be used to extract image or write to file.<br>
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* Screenshot, once taken, can be safely processed in separate thread.<br>
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* Based on {@link BufferedImage} and {@link ImageIO}.
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*
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* @author Ondřej Hruška (MightyPork)
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*/
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public class AwtScreenshot implements Screenshot {
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private final int width;
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private final int height;
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private final int bpp;
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private final ByteBuffer bytes;
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private BufferedImage image;
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/**
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* @param width image width
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* @param height image height
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* @param bpp bits per pixel (typically 4)
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* @param buffer
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*/
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public AwtScreenshot(int width, int height, int bpp, ByteBuffer buffer)
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{
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this.width = width;
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this.height = height;
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this.bpp = bpp;
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this.bytes = buffer;
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}
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/**
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* Extract to an image.<br>
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* Subsequent calls will use a cached value.
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*
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* @return image
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*/
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public BufferedImage getImage()
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{
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if (image != null) return image;
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image = new BufferedImage(this.width, this.height, BufferedImage.TYPE_INT_RGB);
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// convert to a buffered image
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for (int x = 0; x < this.width; x++) {
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for (int y = 0; y < this.height; y++) {
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final int i = (x + (this.width * y)) * this.bpp;
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final int r = this.bytes.get(i) & 0xFF;
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final int g = this.bytes.get(i + 1) & 0xFF;
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final int b = this.bytes.get(i + 2) & 0xFF;
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image.setRGB(x, this.height - (y + 1), (0xFF << 24) | (r << 16) | (g << 8) | b);
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}
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}
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return image;
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}
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/**
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* Save to a file.<br>
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* Cached value is used if any.
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*
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* @param file target file
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* @throws IOException on error writing to file
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*/
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@Override
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public void save(File file) throws IOException
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{
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file.getParentFile().mkdirs();
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ImageIO.write(getImage(), "PNG", file);
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}
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}
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