How Flutter Renders UIsįlutter uses composition aggressively. So when there are UI changes or animations, the engine makes them so fast as if it was a native application. The Flutter engine is so powerful that it can efficiently re-render UIs at a speed of 60 frames per second (60 fps). It also has implementations of Flutter's core APIs (like texts and network I/O) at basic levels. The Flutter engine doesn't only contain Skia. Skia is a 2D graphics library that handles graphics rasterization on various hardware and software. The Flutter engine uses Skia for graphics. But this is more about the efficiency of the engine. This also explains how Flutter is efficiently cross-platform, in terms of UI rendering. Each Flutter app (built for any given platform) contains the engine which handles painting at runtime. The Flutter engine is in charge of interpreting Flutter code to exactly what is drawn on the device's screen. As a Flutter developer, you are in charge of every pixel painted on the device screen.įlutter achieves this with the help of its engine. UI rendering in Flutter is pixel-perfect. This makes the built app small in size (very close to a native app). During the build step, only the app and the Flutter engine are shipped. It is used when you launch the flutter build command. So, the performance of Flutter apps is close (if not equal to) that of native apps.ĭart's Ahead-Of-Time compiler is used to bundle the Flutter code. Naturally, Dart can compile to native code. Adapted from ĭon't worry about performance. So Flutter exposes everything to you to build the app in any way you want it. ![]() It also provides APIs for platform-specific services (through method channels). The Flutter framework gives you APIs for painting and events (through widgets). Same Flutter app working on desktop, mobile, and web. So, Flutter is cheap.Īdding features to your app is fast because you only have to make code updates once in Flutter and that's all. You need to write the code only once in Flutter and you can rest assured that the app will work across the other platforms. So, you don't need to hire developers for each platform. How Flutter is cross-platformįlutter code can run on desktop, mobile, and web platforms. To add a feature, you would've needed to update the code across all these platforms which is tedious. ![]() In the past, you would've needed to hire developers who were proficient at each platform to implement your app on each of those platforms. Making applications for the various desktop and mobile operating systems requires separate SDKs and skillsets. Or, use any frontend JavaScript framework like Angular, React, or Vue. To make your product accessible as a website, you have to use HTML, CSS, and JavaScript. For mobile, you will need to write code for Android (with Kotlin/Java and XML) and iOS (with Swift). For desktop, you will need to write code for macOS (with Swift), Linux (with C), and Windows (with C++). Having support for desktop, mobile, and web platforms is tough. You want your product to have such cross-platform ability so users on any device can use your product comfortably. ![]() Software is cross-platform when it is available for different Operating Systems. Now let's look at each of these features in more detail.
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