Zubnix/ skia-wasm-port
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Description
Port of the Skia drawing library to wasm, for use in javascript (node & browser)
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This project has been superseded by Google's CanvasKit
skia-wasm-port
Port of the Skia drawing library to wasm, for use in node & browser.
Skia is the drawing library used by Chrome and Firefox to provide the actual rendering of web pages.
Goal
The goal of this project is to make skia available to Javascript without the need to rely on native code. The end result would be a library able to do fast complex 2d drawings in both node & the browser.
State
Currently a limited set of skia functions are defined (wip), so the library is not very usable yet. You do get a static archive that contains all llvm bitcode needed to generate the final wasm, as well as a script to generate this llvm bitcode from Skia sources. This library will become usable as soon as enough bindings are defined.
An example is currently available under
example_star.jsthat can be run with node. Running in the browser is also possible if the png file saving is adjusted accordingly. The example exactly matches the one found on the Skia website.
example_star.jsdemonstrates path rendering:
example_gradient.jsdemonstrates gradient shader:
example_text.jsdemonstrates font rendering:
WebGL
Skia WASM can also run in the browser while utilizing a WebGL accelerated back-end. This however requires some modifications to the existing Skia code, which is expected to be implemented upstream in the future. The provided Skia bitcode in this repository includes the needed WebGL changes. More information can be found here
A WebGL port of the Skia SDL example can be found in
docs/webgl.js. You can try it out here. If the page fails to load, try disabling any adblocker.
Defining bindings
Bindings are defined using Embind. Currently defined bindings live in
skia_bindings.cpp.
Building Bindings
This library requires git lfs
Make sure you have the emscripten sdk installed. Current code has been tested on the linux-incoming-64bit version.
Make sure you define the correct paths in
build_bindings.shand run
build_bindings.sh. You should get a
skia.jsand a
skia.wasmfile. To test the build, simply run
example_star.js.
Building Skia bitcode
Clone the official Skia git repository and copy over the
build_skia_wasm_bitcode.shscript together with the
wasm_compatible_build.patch, then simply execute
bash build_skia_wasm_bitcode.sh. Make sure you define the correct paths in the build script!