Copying PGraphics to PImage using .get() or .copy() clears PGraphics object, if the renderer is P2D

Created by: agrshch

Description

An attempt of copying information from PGraphics to PImage using get() or copy() clears the PGraphics object if P2D renderer is used. It makes impossible many things, for example using PGraphics (or its copy) as a texture for the shader.

Expected Behavior

successful copying, like with default renderer

Current Behavior

both PGraphics and PImage are empty.

Steps to Reproduce

PGraphics img1;

void setup() {
size(300, 300, P2D);

img1 = createGraphics(200, 200, P2D);

img1.beginDraw();
img1.background(120);
img1.endDraw();

PImage img2 = img1.get(); // if comment out this line — grey rectangle appears
}

void draw() {
background(255);
image(img1, 100, 20);
}

Your Environment

• Processing version: 4.2
• Operating System and OS version: Mac OS 10.15.7
• Other information:

まず、提供されたP2Dスケッチを実行し、Javaコアライブラリ内のPGraphicsのget()およびcopy()エントリポイントを追跡します。P2Dの動作をデフォルトのレンダラーと比較し、ソースとデスティネーションが空になる理由を確認します。P2DでコピーによってPGraphicsの内容が保持され、内容のあるPImageが生成されれば完了です。