Capturable

🚀A Jetpack Compose utility library for converting Composable content into Bitmap image 🖼️.
Made with ❤️ for Android Developers and Composers

💡Introduction

In the previous View system, drawing Bitmap Image from View was very straightforward. But that's not the case with Jetpack Compose since it's different in many aspects from previous system. This library helps easy way to achieve the same results.

🚀 Implementation

You can check /app directory which includes example application for demonstration.

Gradle setup

In build.gradle of app module, include this dependency

dependencies {
    implementation "dev.shreyaspatil:capturable:2.1.0"
}

You can find latest version and changelogs in the releases.

Usage

1. Setup the controller

To be able to capture Composable content, you need instance of CaptureController by which you can decide when to capture the content. You can get the instance as follow.

@Composable
fun TicketScreen() {
    val captureController = rememberCaptureController()
}

rememberCaptureController() is a Composable function.

2. Add the content

The component which needs to be captured, a capturable() Modifier should be applied on that @Composable component as follows.

@Composable
fun TicketScreen() {
    val captureController = rememberCaptureController()

    // Composable content to be captured.
    // Here, everything inside below Column will be get captured
    Column(modifier = Modifier.capturable(captureController)) {
        MovieTicketContent(...)
    }
}

3. Capture the content

To capture the content, use CaptureController#captureAsync() as follows.

// Example: Capture the content when button is clicked
val scope = rememberCoroutineScope()
Button(onClick = {
    // Capture content
    scope.launch {
        val bitmapAsync = captureController.captureAsync()
        try {
            val bitmap = bitmapAsync.await()
            // Do something with `bitmap`.
        } catch (error: Throwable) {
            // Error occurred, do something.
        }
    }
}) { ... }

On calling this method, request for capturing the content will be sent and ImageBitmap will be returned asynchronously. This method is safe to be called from Main thread.

By default, it captures the Bitmap using Bitmap.Config ARGB_8888. If you want to modify, you can provide config from Bitmap.Config enum.

Example:

captureController.captureAsync(Bitmap.Config.ALPHA_8)

That's all needed!

📄 API Documentation

Visit the API documentation of this library to get more information in detail.

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🙋‍♂️ Contribute

Read contribution guidelines for more information regarding contribution.

💬 Discuss?

Have any questions, doubts or want to present your opinions, views? You're always welcome. You can start discussions.

📝 License

MIT License

Copyright (c) 2022 Shreyas Patil

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.