PGraphics alpha issue

Loadus

Hey guys,

I was tinkering with PGraphics and noticed a little glitch when I drew stuff on the screen on Android. Can someone test this out and confirm that the right side rectangles look like they've had their alpha clipped somehow:

  PGraphics surface; 

  int amount = 1000; 

  surface = createGraphics(displayWidth, displayHeight); 

  surface.beginDraw(); 

    for (int i = 0; i < amount; i++)
    {
      float x = displayWidth * 0.5 + random(-100, 100); 
      float y = displayHeight * 0.5 + random(-100, 100);
      float scale = random(10, 200); 
      float angle = random(360);

      noStroke(); 
      fill(0, 0, 0, 2); 
      pushMatrix(); 
        translate(x - 300, y); 
        rotate(angle); 
        rect(0, 0, scale, scale);
      popMatrix(); 

      surface.noStroke(); 
      surface.fill(0, 0, 0, 2);
      surface.pushMatrix(); 
        surface.translate(x + 300, y);
        surface.rotate(angle);  
        surface.rect(0, 0, scale, scale);
      surface.popMatrix();  
    } 

  surface.endDraw(); 

  image(surface, 0, 0);

Is there something wrong in my code or is Android blending the surface with some odd colorspace (like RGB565)? OR if you see the two rectangle stacks as 1:1 it might just be my device. I tried using getSurfaceHolder().setFormat(1) which worked beautifully at showing the images but this little hiccup is left. Can anyone point me into the right direction here? Cheers! ^.^

Loadus

After fiddling around with these, it seems that the oddities are the result of bad blending (values get rounded and do not accumulate properly) in the hardware and is not a problem in Processing.

akenaton

@loadus i tested (2 phones) & got the same result as you; trying to add OPENGL as renderer in createGraphics() works... But only for the surface!: the other one disappears... As for pixelFormat i think that android default is not ARGB 888 but 565...But i have not tried to change that till now....