disabled perspective correction for lines in P2D and handling loadPixels() call outside beginDraw/endDraw

java/libraries/opengl/src/processing/opengl/PGraphics2D.java

@@ -28,6 +28,7 @@ public class PGraphics2D extends PGraphicsOpenGL {
   public PGraphics2D() {
     super();
     hints[ENABLE_ACCURATE_2D] = true;
+    hints[ENABLE_PERSPECTIVE_CORRECTED_LINES] = false;
   }
   
 }

java/libraries/opengl/src/processing/opengl/PGraphicsOpenGL.java

@@ -4674,6 +4674,12 @@ public class PGraphicsOpenGL extends PGraphics {
   // Initializes the pixels array, copying the current contents of the
   // color buffer into it.
   public void loadPixels() {
+    boolean needEndDraw = false;
+    if (!drawing) {
+      beginDraw();
+      needEndDraw = true;
+    }
+    
     if (!setgetPixels) {
       // Draws any remaining geometry in case the user is still not
       // setting/getting new pixels.
@@ -4690,6 +4696,10 @@ public class PGraphicsOpenGL extends PGraphics {
         pixelsToTexture();
       }
     }
+    
+    if (needEndDraw) {
+      endDraw();
+    }
   }