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Index › Programming Questions & Help › Syntax Questions › saving a screenshot to a PImage
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saving a screenshot to a PImage (Read 1178 times)
ddf
saving a screenshot to a PImage
Jan 9th, 2007, 3:51pm  
I'm trying save a screenshot of my game to a PImage so I can use it as a background image after a state change. The code I'm using is being executed at the beginning of the draw loop, before anything has been drawn but also before any calls to background(), which I assume means that the pixel buffer still has stuff in it. Am I wrong? Here's the code (back is a PImage, the declaration is elsewhere):

Code:

back = createImage(width, height, ARGB);
loadPixels();
arraycopy(pixels, back.pixels);
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st33d
Re: saving a screenshot to a PImage
Reply #1 - Jan 9th, 2007, 4:16pm  
createGraphics doesn't create a PImage.

Try this:
Code:

PImage back;
void setup(){
  size(400, 400);
  back = new PImage(400, 400, ARGB);
  rect(0,0,width, height);
  loadPixels();
  back.copy(g,0,0,width,height,0,0,width,height);
  background(0);
}
void draw(){
  image(back, 0, 0);
  rect(mouseX, mouseY, 50, 50);
  if(mousePressed){
    loadPixels();
    back.copy(g,0,0,width,height,0,0,width,height);
    back.updatePixels();
  }
}

(Going to post a bug about 'g', I shouldn't have to reference it but I can't get this code to work without it.)
(Edit: Oh, I already have)
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fry
Re: saving a screenshot to a PImage
Reply #2 - Jan 9th, 2007, 7:52pm  
this should be all you need:

PImage saved = get();
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ddf
Re: saving a screenshot to a PImage
Reply #3 - Jan 9th, 2007, 10:55pm  
back = get(); does the trick.

What doesn't work is:

background(back);

I had to change that line to:

image(back, 0, 0);

as in steed's example. The doc for background() claims you can use an image as an argument, is this some kind of weird special case bug?
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fry
Re: saving a screenshot to a PImage
Reply #4 - Jan 10th, 2007, 12:13am  
that might be a special case bug. try changing the renderer to P3D instead of JAVA2D (if that's what you're using) and see if the image shows up.
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ddf
Re: saving a screenshot to a PImage
Reply #5 - Jan 10th, 2007, 12:29am  
Oh, right, forgot to mention, I did try that.

background(back); works with P3D and JAVA2D.

It does not work with OPENGL, which is the mode I'm running in.
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fry
Re: saving a screenshot to a PImage
Reply #6 - Jan 10th, 2007, 3:31pm  
gotcha, that's this bug:
http://dev.processing.org/bugs/show_bug.cgi?id=91
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