250X increase in BufferedImage draw time from 1.5 to 1.6
I had a program running fine in 1.5, had 3-4ms to draw 45 of the image to the screen, for a large image scaled small before drawing. Now after 1.6, I'm getting 820 ms for the same thing, and -version:1.5 will return it to 3-4. Did something change from 1.5 to 1.6? drawing the loaded image to a second image before drawing seems to drastically speed it up, as shown in this code.
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
publicclass Testextends JFrame{
public Test(java.awt.image.BufferedImage bu){
b=new BufferedImage(bu.getWidth(),bu.getHeight(),BufferedImage.TYPE_INT_ARGB);
b.getGraphics().drawImage(bu,b.getWidth(),b.getHeight(),null);
c=bu;
}
publicstaticvoid main(String[] args){
Test t;
try{
t=new Test(javax.imageio.ImageIO.read(new java.io.File("tank.png")));
t.setSize(640,480);
t.setVisible(true);
for(int i=0;i<20;t.repaint())
t.invalidate();
System.out.println("done");
}catch(Exception e){
System.out.println("error");
e.printStackTrace();
}
}
publicvoid paint(java.awt.Graphics g){
System.out.println("c");
long t=System.nanoTime();
for(int i=0;i<50;i++){
g.drawImage(c,(i%10)*50,(i/10)*50,50,50,null);
}
System.out.println(System.nanoTime()-t);
System.out.println("b");
t=System.nanoTime();
for(int i=0;i<50;i++){
g.drawImage(b,(i%10)*50,(i/10)*50,50,50,null);
}
System.out.println(System.nanoTime()-t);
System.out.println("c");
t=System.nanoTime();
for(int i=0;i<50;i++){
g.drawImage(c,(i%10)*50,(i/10)*50,50,50,null);
}
System.out.println(System.nanoTime()-t);
try{
Thread.currentThread().sleep(100);}catch(Exception e){
}
}
BufferedImage b;
BufferedImage c;
}
I got this output (partial)
c
735032245
b
5980649
c
621233145
c
636763611
b
5810794
c
674099920
c
684414360
b
8663950
c
722404663
c
653634191
b
6532674
c
674372301
c
684147566
b
5422477
c
643982684
c
665757240
b
6029816
c
682749902
c
654843563
b
5109588
c
656486789
c
655536388
b
5046451
c
630079801
c
669861114
b
5156241
c
663675970
c
658672541
b
5067124
c
701646718
c
739559357
b
6100775
c
683766233
c
717030237
b
6912052
c
745393060
c
675646486
b
4612038
c
735275852
c
742058837
b
4696407
c
806628776
c
711131722
b
16984282
c
707504166
c
648611765
b
5418845
c
654920947
c
646268171
b
17911494
c
639430710
c
678515286
b
4755073
c
617724040
c
648390787
b
4743899
c
657646153
c
652459740
b
4634109
c
661877138
c
649476400
b
4591086
c
642310964
c
681698651
b
5361295
c
679005572
c
675222131
b
4662604
c
676943857
c
687534309
b
6773207
c
641403307
c
669728136
b
5059303
c
658017150
c
672984695
b
4617905
c
648743346
c
634762798
b
4681600
c
690653980
c
638157643
b
4729372
c
748789022
c
674756429
b
6717054
c
697223809
c
689808062
b
4664000
c
638143115
c
678560264
b
4724343
c
674861190
c
670472085
b
7397309
c
660327779
c
690909878
b
4992534
c
747887790
c
621971228
b
17102732
c
628246886
c
628726277
b
5182781
c
632977376
c
661510611
b
16858287
c
645003485
The image I used is at http://greyscribes.com/images/uploaded/Tank.png
