blendMode support on Android

Processing for Android
1

Which blendMode types are supported on Android?

I’ve been looking at this documentation: https://processing.org/reference/blendMode_.html

When running using blendMode(MULTIPLY) I get the warning:

blendMode(), or this particular variation of it, is not available with this renderer.

2

I have tested the code below on an Android 10 device with APDE using images below, and I did not get any error. The blendMode() function didn’t give any error as well on my device.

PImage c1, c2;
PGraphics pg;
int mode;

int[] modes = {
    BLEND,
    ADD,
    SUBTRACT,
    DARKEST,
    LIGHTEST,
    DIFFERENCE,
    EXCLUSION,
    MULTIPLY,
    SCREEN,
    OVERLAY,
    HARD_LIGHT,
    SOFT_LIGHT,
    DODGE,
    BURN};

void setup() {
  size (600, 400);
  c1 = loadImage("1.jpg");
  c2 = loadImage("2.jpg"); 
}

void draw() {
  background(255);
  try {
  c1.blend(c2, 0, 0, 200, 400, 400, 0, 200, 400, modes[mode]); 
  } catch(Exception e) {
    println("mode "+mode+" not possible");
  }
  image(c1, 0, 0); 
  image(c2, 0, 0); 
}

void mousePressed() {
  mode++;
  println(mode);
  if (mode == 14) mode = 0;
}

1
2

3

Isn’t that code testing blend()?! blendMode() works differently across all the renderers.

4

True, the best renderer I think is P2D.
The code below testing the blendMode() method gives me same results on PC and Android without errors, but I don’f get the expected results; Some seem to have no effect at all.
Or maybe I am testing this the wrong way?

Edit: actually I do get warnings in P2D renderer on PC, not on Android.
and also not with the default or FX2D renderer.

blendMode(DIFFERENCE) is not supported by this renderer
blendMode(OVERLAY) is not supported by this renderer
blendMode(HARD_LIGHT) is not supported by this renderer
blendMode(SOFT_LIGHT) is not supported by this renderer
blendMode(DODGE) is not supported by this renderer
blendMode(BURN) is not supported by this renderer

Anyways also in P2D it doesn’t look right.

int mode; 
String[] txt = {"BLEND", "ADD", "SUBTRACT", "DARKEST", "LIGHTEST", "DIFFERENCE", "EXCLUSION", "MULTIPLY", "SCREEN", "OVERLAY", "HARD_LIGHT", "SOFT_LIGHT", "DODGE", "BURN"}; 
int[] modes = {BLEND, ADD, SUBTRACT, DARKEST, LIGHTEST, DIFFERENCE, EXCLUSION, MULTIPLY, SCREEN, OVERLAY, HARD_LIGHT, SOFT_LIGHT, DODGE, BURN}; 

void setup() { 
  size (600, 600, P2D); 
  textSize(30);
  println(mode+"  "+txt[mode]); 
} 

void draw() { 
  push();
  blendMode(modes[mode]); 
  fill(255, 0, 0); 
  rect(0, 0, 200, 600); 
  rect(0, 0, 600, 200); 
  fill(0, 255, 0); 
  rect(200, 0, 200, 600); 
  rect(0, 200, 600, 200); 
  fill(0, 0, 255); 
  rect(400, 0, 200, 600); 
  rect(0, 400, 600, 200); 
  pop();
  fill(0); 
  text(txt[mode], 10, 50);
  fill(255);
  text(txt[mode], 230, 50);
} 

void mousePressed() { 
  mode++; 
  if (mode == 14) mode = 0;
  println(mode+"  "+txt[mode]); 
}
5

Thanks guys - I’ll give P2D a go and see how that goes!