Even with a bit more knowledge of Processing, the answer is basically the same...
I experimented a bit with mask(): problem, it doesn't work with a JAVA2D graphics, and on a P2D graphics, it alters the transparent background.
I give here my experimentation, it might be OK if the restrictions doesn't affect you.
Code:void setup()
{
size(500, 500);
background(#9900CC);
PGraphics g = createGraphics(500, 500, P2D);
g.beginDraw();
// g.noStroke();
for (int i = 0; i < 50; i++)
{
g.fill(random(100, 200));
g.rect(random(10, 300), random(10, 300), random(100, 200), random(100, 200));
}
g.fill(0, 0); // Transparent Black
// Doesn't work!
g.rect(100, 100, 300, 300);
g.endDraw();
PGraphics msk = createGraphics(500, 500, JAVA2D);
msk.beginDraw();
msk.background(255);
msk.fill(0);
msk.rect(100, 100, 300, 300);
msk.endDraw();
g.mask(msk);
image(g, 0, 0);
}
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