Benchmark: Setting Canvas Pixel

HTML Preparation code:

<canvas id="c" width="800" height="300"></canvas>

Script Preparation code:

$c = document.getElementById('c');
$ctx = $c.getContext('2d');
$ctx.clearRect(0, 0, 800, 300);
$px = $ctx.createImageData(800, 300);
$pxls = [];
for (var i=0; i<10000; ++i) $pxls.push({
   x: Math.random() * 800 << 0,
   y: Math.random() * 300 << 0,
   r: Math.random() * 255 << 0,
   g: Math.random() * 255 << 0,
   b: Math.random() * 255 << 0,
   a: Math.random() * 128 << 0 + 128
});
$i = 0;

Tests:

fillRect/concat
for (var i=500;i--;){ var px = $pxls[$i++ % 10000]; $ctx.fillStyle = 'rgba(' + px.r + ',' + px.g + ',' + px.b + ',' + (px.a / 255) + ')'; $ctx.fillRect(px.x, px.y, 1, 1); }
fillRect/join
for (var i=500;i--;){ var px = $pxls[$i++ % 10000]; $ctx.fillStyle = 'rgba(' + [px.r,px.g,px.b,px.a/255].join() + ')'; $ctx.fillRect(px.x, px.y, 1, 1); }
1×1 Image Data
for (var i=500;i--;){ var px=$pxls[$i++ % 10000], d=$px.data; d[0] = px.r; d[1] = px.g; d[2] = px.b; d[3] = px.a; $ctx.putImageData($px, px.x, px.y); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fillRect/concat
fillRect/join
1×1 Image Data

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.108 (Dart) Safari/537.36

Browser/OS: Chrome 50 on Linux

View result in a separate tab

Test name	Executions per second
fillRect/concat	550.7 Ops/sec
fillRect/join	407.5 Ops/sec
1×1 Image Data	15.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what's being tested.

**Benchmark Purpose**

The test is designed to measure the performance of different ways to draw pixels on a canvas using JavaScript. Specifically, it compares three approaches:

1. Using `fillStyle` with concatenated strings (`fillRect/concat`)
2. Using `fillStyle` with an array expression (`fillRect/join`)
3. Using `putImageData` with an image data array (`1×1 Image Data`)

**Options Comparison**

The benchmark tests these three options because they are common ways to draw pixels on a canvas using JavaScript. Here's a brief analysis of each option:

* **fillRect/concat**: This method uses string concatenation to build the `fillStyle` string, which can lead to slower performance due to the overhead of creating and manipulating strings.
* **fillRect/join**: This method uses an array expression to build the `fillStyle` string, which is more efficient than concatenation because it avoids creating intermediate strings. However, it may still have some overhead due to the creation and manipulation of arrays.
* **1×1 Image Data**: This method uses `putImageData` to draw a single pixel at a time. It's likely the fastest option because it avoids any overhead related to string manipulation or array creation.

**Pros and Cons**

Here are some pros and cons of each approach:

* **fillRect/concat**: Pros: simple to implement, easy to understand. Cons: may be slower due to string concatenation.
* **fillRect/join**: Pros: more efficient than concatenation, but still has some overhead due to array creation. Cons: can be less intuitive for beginners.
* **1×1 Image Data**: Pros: likely the fastest option, avoids any overhead related to string manipulation or array creation. Cons: may require more complex implementation.

**Library Usage**

In this benchmark, no libraries are explicitly mentioned as being used. However, it's worth noting that `putImageData` is a standard JavaScript method for drawing images on a canvas, so it doesn't introduce any external dependencies.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax being tested in this benchmark. The code uses standard JavaScript syntax and features, such as string concatenation, array expressions, and `putImageData`.

**Alternatives**

If you're looking for alternatives to these approaches, here are a few options:

* Instead of using `fillRect/concat`, you could use the `createCanvas` method provided by modern browsers (e.g., `const canvas = document.createElement('canvas');`) or a library like CanvasJS.
* For `fillRect/join`, you could consider using a faster string manipulation method, such as using a `StringBuilder` class (available in some JavaScript engines).
* For `1×1 Image Data`, you could use other methods for drawing pixels on a canvas, such as using the `createPixelArray` method or a library like Pixi.js.

Overall, this benchmark provides a useful comparison of different approaches to drawing pixels on a canvas using JavaScript. By understanding the pros and cons of each option, developers can choose the fastest and most efficient approach for their specific use case.

Related benchmarks:

Setting Canvas Pixel (version: 0)

Comparing performance of: fillRect/concat vs fillRect/join vs 1×1 Image Data

Created: 7 years ago by: Guest

Jump to the latest result

fillRect/concat

fillRect/join

1×1 Image Data

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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