kon3gor / lubricant

Yet another dynamic blur library.

// root build.gradle
allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

// app/build.gradle
repositories {
    implementation("com.github.Miha-x64:Lubricant:852f8498f1")
}

Motivation?

Most libraries use RenderScript which shows poor performance to me. Also, most of them use onPreDraw as invalidation listener catching all invalidations across the window.

Name?

In order to apply a post-effect, you need to lubricate Android SDK heavily. Also, in Russian, “blurry” and “lubricated” is the same word, as well as “unclear” or “smooth”.

Architecture

Layer 1: static blur

StackBlur class provides blurRgb and blurArgb methods for applying blur effect to an ARGB_8888 bitmap. For blurArgb it must be premultiplied which is almost always true.

The Stack Blur Algorithm by Mario Klingemann ported by Yahel Bouaziz found on StackOverflow is used and improved for better speed and less memory consumption.

Layer 2: DynamicBlur

This class is used to hold a bitmap, and manage downscaling, drawing, and blurring.

Layer 3: ViewBlurDrawable, PostEffectView

A ready-to-use drawable taking image from PostEffectView.

Just drop a PostEffectRecyclerView into layout and set rv.blurDrawable(…) as a background for some overlaid view. See MainLayout for examples.

Blur in Vector Drawables

Under construction.

Blur for VideoView?

Check out VidEffects library which allows you to apply a shader on a video. This is not enough for quality backdrop effect, so this challenge remains to me.