Benchmark: Image vs ImageBitmap 2

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;

var ctx = canvas.getContext('2d');
var ctx2 = canvas2.getContext('2d');

img.addEventListener('load', function() {
  Promise.all([
    createImageBitmap(img)
  ]).then(function(images) {
  imageBitmap = images[0];
  doneLoading = true;
}, false);
});

img.src = 'https://media.discordapp.net/attachments/447410261289205781/574359442913492992/unknown.png';

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Image
ImageBitmap

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Linux

View result in a separate tab

Test name	Executions per second
Image	96173616.0 Ops/sec
ImageBitmap	104321040.0 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 explanation of the provided benchmark.

**Benchmark Definition and Script Preparation Code**

The benchmark is designed to compare the performance of two approaches: using an `Image` object and using an `ImageBitmap`. The script preparation code sets up the necessary environment for both tests:

1. It creates two canvases with the same dimensions.
2. It gets a reference to the 2D drawing context for each canvas (`ctx` and `ctx2`).
3. It defines a variable `img` as an instance of the `Image` object, which will be used to load an image from a URL.
4. It sets up an event listener on the `img` object to handle when the image is loaded.

**Benchmark Definition and Individual Test Cases**

The benchmark definition consists of two individual test cases:

1. **"Image"`**: This test case uses the `ctx.drawImage()` method to draw the `img` object onto the canvas.
2. **"ImageBitmap"`**: This test case uses the `ctx2.drawImage()` method to draw an `ImageBitmap` object onto the canvas, which is created from the loaded `imageBitmap` variable.

**Options Compared**

The benchmark compares the performance of two approaches:

1. **Using an `Image` object**: The `img` object is used directly in the `ctx.drawImage()` method.
2. **Using an `ImageBitmap`**: The loaded image is converted to an `ImageBitmap` object, which is then used in the `ctx2.drawImage()` method.

**Pros and Cons of Each Approach**

**Using an `Image` object**:

Pros:

* More straightforward and intuitive approach
* May be faster since it avoids additional conversions

Cons:

* May require more resources (e.g., memory) due to the large image size
* May introduce additional overhead due to the direct drawing operations

**Using an `ImageBitmap`**:

Pros:

* Can avoid some of the overhead associated with direct drawing operations
* May be more efficient since it allows for more optimized rendering pipelines

Cons:

* Requires converting the image to an `ImageBitmap` object, which may introduce additional latency
* May require more resources (e.g., memory) due to the additional conversion step

**Other Considerations**

The benchmark also takes into account other factors that might affect performance, such as:

* The device platform and operating system used for testing
* The number of executions per second (which can indicate the overall throughput of the test)

**Library Used: ImageBitmap**

The `ImageBitmap` API is a modern JavaScript API introduced in ECMAScript 2018. It allows converting an image to a bitmap representation, which can be useful for various purposes, such as:

* Converting images between different formats (e.g., PNG to JPEG)
* Creating thumbnails or miniatures of images
* Optimizing image processing workflows

**Special JS Feature/Syntax**

The benchmark uses the `Promise.all()` method to wait for both the image to load and the conversion to an `ImageBitmap` object to complete before proceeding with the test. This allows handling asynchronous operations in a more elegant way.

However, without further context or information, it's difficult to say if this is a special JavaScript feature or syntax. If you have any additional questions or clarification regarding this point, please let me know!

Related benchmarks:

Image vs ImageBitmap 2 (version: 0)

Comparing performance of: Image vs ImageBitmap

Created: 7 years ago by: Guest

Jump to the latest result

Image

ImageBitmap

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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