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:

首先运行提供的 P2D sketch，并跟踪 Java 核心库中 PGraphics 的 get() 和 copy() 入口点。将 P2D 的行为与默认渲染器进行比较，检查源和目标为何会变为空。完成的标准是：复制操作保留 PGraphics 的内容，并在 P2D 下生成一个有内容的 PImage。