implement imageMode(CENTER)

core/src/processing/core/PGraphicsJava2D.java

@@ -1386,6 +1386,11 @@ public class PGraphicsJava2D extends PGraphics {
 
   protected void setImpl(int dx, int dy, int sx, int sy, int sw, int sh,
                          PImage src) {
+    if (imageMode == CENTER) {
+      dx -= src.width/2;  // not sw, since it's already cropped
+      dy -= src.height/2;
+    }
+
     WritableRaster raster = ((BufferedImage) image).getRaster();
     if ((sx == 0) && (sy == 0) && (sw == src.width) && (sh == src.height)) {
       raster.setDataElements(dx, dy, src.width, src.height, src.pixels);

core/src/processing/core/PImage.java

@@ -400,6 +400,10 @@ public class PImage implements PConstants, Cloneable {
     int sw = src.width;
     int sh = src.height;
 
+    if (imageMode == CENTER) {
+      dx -= src.width/2;
+      dy -= src.height/2;
+    }
     if (dx < 0) {  // off left edge
       sx -= dx;
       sw += dx;

core/todo.txt

@@ -7,6 +7,7 @@ o     write up examples for these instead?
 o     start an integration section?
 X get() in java2d not honoring imageMode or rectMode
 X add imageMode(CENTER) implementation
+X   add a bunch of changes to the reference to support this
 
 cleanup
 X switch to requestImage() (done in 0145)

opengl/src/processing/opengl/PGraphicsOpenGL.java

@@ -2457,6 +2457,10 @@ public class PGraphicsOpenGL extends PGraphics3D {
    * vertically. Both have their components all swapped to native.
    */
   public void set(int x, int y, PImage source) {
+    if (imageMode == CENTER) {
+      x -= source.width / 2;
+      y -= source.height / 2;
+    }
     int backup[] = new int[source.pixels.length];
     System.arraycopy(source.pixels, 0, backup, 0, source.pixels.length);
     javaToNativeARGB(source);