Apply multiple effect on bitmap without saving it

Question

My requirement is to load multiple Effect on bitmap. I am following apply-effects-on-image-using-effects for it. I got success for applying the effect but My requirements is to give brightness effect separately. That means user can able to give Brightness effect after applying any other effect without saving the file.

I know that after saving file and render that file again makes it possible. But i need it without saving image file.

Right now, if i apply Brightness on any applied effect the applied effect is gone and Brightness shows its effect. It because of the below code:

mEffect = effectFactory.createEffect(EffectFactory.EFFECT_BRIGHTNESS);

Here, mEffect is always initialize to give the new effect on texture. Without that i am not able to load the effect.

So, My question is, how to load multiple effect on same texture without saving it.

Answer 1

Create 3 textures, instead of 2:

private int[] mTextures = new int[3];

private void loadTextures() {
    // Generate textures
    GLES20.glGenTextures(3, mTextures, 0);
    ...

after that, you can apply sequentially two effects one after another, like that:

private void applyEffect() {
    if (mNeedSecondEffect) {
       mEffect.apply(mTextures[0], mImageWidth, mImageHeight, mTextures[2]);
       mSecondEffect.apply(mTextures[2], mImageWidth, mImageHeight, mTextures[1]);
    } else {
       mEffect.apply(mTextures[0], mImageWidth, mImageHeight, mTextures[1]);
    }
}

using 2 textures for effects you can apply a cascade of any amount of effects, changing source and destination textures.

EDIT For multiple effects try this:

Let's imagine you have an array of effects cascade

 Effect mEffectArray[] = ...; // the effect objects to be applied
 int mEffectCount = ... ; // number of effects used right now for output 

Then your applyEffect() method will be something like this:

private void applyEffect() {
    if (mEffectCount > 0) { // if there is any effect
        mEffectArray[0].apply(mTextures[0], mImageWidth, mImageHeight, mTextures[1]); // apply first effect
        for (int i = 1; i < mEffectCount; i++) { // if more that one effect
            int sourceTexture = mTextures[1]; 
            int destinationTexture = mTextures[2];
            mEffectArray[i].apply(sourceTexture, mImageWidth, mImageHeight, destinationTexture);
            mTextures[1] = destinationTexture; // changing the textures array, so 1 is always the texture for output, 
            mTextures[2] = sourceTexture; // 2 is always the sparse texture
        }
    }
}