WASM Use Cases: Image Processing and Computation
Apply WASM in React for CPU-intensive tasks like image filters, cryptographic hashing, and data parsing.
Image Processing Pipeline
The standard image processing pipeline with WASM: get an ImageData object from a canvas, convert its pixel data to a typed array (Uint8Array), copy it into WASM linear memory, call the WASM function to apply the filter, copy the result back out, and use putImageData() to render the processed image on the canvas.
Performance: WASM vs JS Filters
Benchmark comparisons consistently show WASM grayscale and blur filter implementations outperforming equivalent JavaScript by 5-10x on large images. For a 4000x3000 pixel image, a JavaScript grayscale filter may take 80ms while the Rust WASM version completes in under 10ms. This difference is perceptible to users in real-time editing scenarios.
All lessons in this course
- What Is WebAssembly and Where React Fits
- Loading WASM Modules in React
- Rust to WASM with wasm-pack and React
- WASM Use Cases: Image Processing and Computation