Hallo!

I have the following problem:

I simply load an image and set it as background and always get the following exception:

----8<-----
java.lang.RuntimeException: background image must be the same size as your application
at processing.core.PGraphicsJava2D.background(PGraphicsJava2D.java:1051)
at processing.core.PApplet.background(PApplet.java:7928)
at Temporary_2607_5256.draw(Temporary_2607_5256.java:11)
at processing.core.PApplet.handleDisplay(PApplet.java:1355)
at processing.core.PGraphics.requestDisplay(PGraphics.java:564)
at processing.core.PApplet.run(PApplet.java:1450)
at java.lang.Thread.run(Unknown Source)
----8<-----

The same code works on windows.

A minimum example would be the following:

----8<-----
PImage bg;

void setup()
{
 size(200, 200);
 
 bg = loadImage("test.jpg");
}

void draw() {
background(bg);
}
----8<-----


Is this a known bug or a workaround ?

Many thanks,
LG
Georg

PS: I use processing 0124 Beta

you're probably hitting this linux-specific bug:
http://dev.processing.org/bugs/show_bug.cgi?id=341

for now, you can use image(bg, 0, 0) at the beginning of setup.

generallly yes, though it depends on how it's used. if you need to call background() to clear the zbuffer (i.e. with P3D), then it's slower because you're replacing all the pixels twice.

actually, hopefully you can use set() instead of image() (though set() also needs a bounds fix check so it may have the same problem--another bug). set() is faster because it does a direct copy of the pixels (same as background()) rather than scaling/transforming the image.