Benchmark: Image vs ImageBitmap vs canvas with context2d

Script Preparation code:

var img = new Image();
var imageBitmap;
var doneLoading = false;

let canvas = document.createElement('canvas');
canvas.width = 640;
canvas.height = 480;

let canvas2 = document.createElement('canvas');
canvas2.width = 640;
canvas2.height = 480;

let canvas3 = document.createElement('canvas');
canvas3.width = 640;
canvas3.height = 480;

var ctx = canvas.getContext('2d');
var ctx2 = canvas2.getContext('2d');
var ctx3 = canvas2.getContext('2d');

var cv = document.createElement('canvas');
cv.width = 700;
cv.height = 700;
var cvx = cv.getContext('2d');

img.addEventListener('load', function() {
  
  cvx.drawImage(img,0,0);
  
    Promise.all([
    createImageBitmap(img)
  ]).then(function(images) {
  imageBitmap = images[0];
  doneLoading = true;
}, false);
    
});

img.src = 'https://1.bp.blogspot.com/-52MtzD0GfX0/WvP52CL1WjI/AAAAAAAAOVw/_OpK4JHeWK01d-7IiZ6vzojYGhXqLRXrACLcBGAs/s1600/EMxediL.jpg';

Tests:

Image
if (doneLoading) ctx.drawImage(img,0,0);
ImageBitmap
if (doneLoading) ctx2.drawImage(imageBitmap,0,0);
canvas
if (doneLoading) cvx.drawImage(cv,0,0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Image
ImageBitmap
canvas

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0

Browser/OS: Firefox 145 on Windows

View result in a separate tab

Test name	Executions per second
Image	577810.6 Ops/sec
ImageBitmap	529525.9 Ops/sec
canvas	5576.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the details of this benchmark.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark that compares the performance of three different approaches to draw an image:

1. Using a raw Image
2. Using an ImageBitmap
3. Using a canvas element with context 2D

The benchmark is designed to test the number of executions per second (ExecutionsPerSecond) for each approach.

**Options Compared**

The three options being compared are:

* Raw Image: This method uses the native `drawImage()` function on the `img` object.
* ImageBitmap: This method uses the `createImageBitmap()` function and then draws the image using the `drawImage()` function on an ImageBitmap object.
* Canvas with context 2D: This method creates a new canvas element, gets its 2D drawing context, and draws the image using the `drawImage()` function.

**Pros and Cons of Each Approach**

1. **Raw Image**: This approach is simple and efficient, but it may not be suitable for large images or images with complex pixel data.
	* Pros: Fast and lightweight
	* Cons: May not handle large images or complex pixel data well
2. **ImageBitmap**: This approach uses the `createImageBitmap()` function to convert the image to a more convenient format, which can improve performance for some use cases.
	* Pros: Can handle larger images and more complex pixel data than raw Image
	* Cons: May introduce overhead due to the conversion process
3. **Canvas with context 2D**: This approach uses the canvas element to draw the image, which provides a high degree of control over the rendering process.
	* Pros: Provides fine-grained control over rendering and can handle complex pixel data well
	* Cons: May be slower than raw Image or ImageBitmap due to the overhead of creating and manipulating the canvas element

**Library Used**

The `createImageBitmap()` function is used in the ImageBitmap test case. This function converts an image into a bitmap format that can be manipulated as a 2D array of pixels.

**Special JavaScript Feature/Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. The code is standard JavaScript and uses only native functions and features.

**Other Alternatives**

If you wanted to test different approaches, you could consider the following alternatives:

* Using WebGL or WebGPU: These APIs provide high-performance rendering capabilities and can be used to render images.
* Using a library like Pixi.js or Fabric.js: These libraries provide a higher-level API for working with graphics and canvas elements, which can simplify some aspects of rendering.
* Testing different image formats: You could test using different image formats, such as WebP or AVIF, to see how they perform in the benchmark.

Overall, this benchmark provides a good starting point for comparing the performance of different approaches to drawing images in JavaScript. By testing each approach with and without the ImageBitmap conversion, you can get a better understanding of their relative performance characteristics.

Related benchmarks:

Image vs ImageBitmap vs canvas with context2d (version: 0)

Testing draw calls using a raw Image versus an ImageBitmap vs canvas

Comparing performance of: Image vs ImageBitmap vs canvas

Created: 4 years ago by: Guest

Jump to the latest result

Image

ImageBitmap

canvas

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):