Portable Network Graphics Specification (Third Edition)

Library Documentation

1. import javax.imageio.ImageIO;
   import java.awt.image.BufferedImage;
   import java.io.*;
   
   import com.librian.lib.APNGCollector;
   
   import static com.librian.lib.APNGCollector.*;
   
   void main() throws Exception {
       BufferedImage i1 = ImageIO.read(new File("./example/1.png")),
                     i2 = ImageIO.read(new File("./example/2.png")),
                     i3 = ImageIO.read(new File("./example/3.png")),
                     i4 = ImageIO.read(new File("./example/4.png"));
   
       APNGCollector apng = new APNGCollector(i1, 0, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i2, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i3, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i2, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_PREVIOUS, APNG_BLEND_OP_OVER);
       apng.addFrame(i4, 40, 48, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i2, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i3, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
   
       FileOutputStream f = new FileOutputStream("./test.png");
       f.write(apng.build());
       f.close();
   }

   input:
   

   output:
   
   

2. import javax.imageio.ImageIO;
   import java.awt.image.BufferedImage;
   import java.io.*;
   
   import com.librian.lib.APNGCollector;
   
   import static com.librian.lib.APNGCollector.*;
   
   void main() throws Exception {
       BufferedImage i1 = ImageIO.read(new File("./example/1.png")),
                     i2 = ImageIO.read(new File("./example/2.png")),
                     i3 = ImageIO.read(new File("./example/3.png")),
                     i4 = ImageIO.read(new File("./example/4.png"));
   
       APNGCollector apng = new APNGCollector(i1, 0);
       apng.addFrame(i2, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i3, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i2, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_PREVIOUS, APNG_BLEND_OP_OVER);
       apng.addFrame(i4, 40, 48, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i2, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
       apng.addFrame(i3, 26, 40, (short) 70, (short) 100, APNG_DISPOSE_OP_NONE, APNG_BLEND_OP_OVER);
   
       FileOutputStream f = new FileOutputStream("./test.png");
       f.write(apng.build());
       f.close();
   }

   input:
   

   output:
   
   

3. import javax.imageio.ImageIO;
   import java.awt.image.BufferedImage;
   import java.io.*;
   
   import com.librian.lib.APNGSeparator;
   
   void main() throws Exception {        
       FileInputStream stream = new FileInputStream("./test.png");
       APNGSeparator separator = new APNGSeparator(stream);
   
       // #1
       int i = 0;
       for (BufferedImage img : separator.getFrames(true))
           ImageIO.write(img, "PNG", new File(STR."./1_\{++i}.png"));
   
       // #2
       i = 0;
       for (BufferedImage img : separator.getFrames(false)) {
           // Bright border for frame with transparent background.
           var output = new BufferedImage(img.getWidth() + 2, img.getHeight() + 2, BufferedImage.TYPE_INT_ARGB);
           output.getGraphics().drawImage(img, 1, 1, null);
           output.getGraphics().drawRect(0, 0, output.getWidth() - 1, output.getHeight() - 1);
   
           ImageIO.write(output, "PNG", new File(STR."./2_\{++i}.png"));
       }
       stream.close();
   }

   input:
   
   output:
   

   1. <- static image
      
   2. <- static image
      

4. import javax.imageio.ImageIO;
   import java.awt.image.BufferedImage;
   import java.io.*;
   
   import com.librian.lib.APNGSeparator;
   import com.librian.lib.Frame;
   
   void main() throws Exception {
       FileInputStream stream = new FileInputStream("./test.png");
       APNGSeparator separator = new APNGSeparator(stream);
   
       int i = 0;
       for (Frame img : separator.getRawFrames()) {
           // Bright border for frame with transparent background.
           var output = new BufferedImage(
                   img.image.getWidth() + 2,
                   img.image.getHeight() + 2,
                   BufferedImage.TYPE_INT_ARGB);
           output.getGraphics().drawImage(img.image, 1, 1, null);
           output.getGraphics().drawRect(0, 0, output.getWidth() - 1, output.getHeight() - 1);
   
           ImageIO.write(output, "PNG", new File(STR."./\{++i}.png"));
       }
   
       stream.close();
   }

   input:
   
   output:
   <- static image