Benchmark: Setting Canvas Pixel with extra test case using backtick

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(1, 1);
$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; $ctx.putImageData($px, px.x, px.y); }
fillRect/backtick
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); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its various components.

**Benchmark Definition**

The benchmark is designed to test the performance of different ways to set a pixel color on an HTML5 canvas element using JavaScript. The script preparation code creates a 2D context (`$ctx`) on a canvas element with specific dimensions (800x300 pixels) and clears the canvas. It then generates an array of pixel data (`$pxls`) containing random RGB values.

**Individual Test Cases**

There are four test cases, each comparing a different approach to set a single pixel color on the canvas:

1. `fillRect/concat`: Uses a simple string concatenation to build the RGBA color string.
2. `fillRect/join`: Utilizes the built-in `join()` method to concatenate the RGB values into a single string.
3. `1×1 Image Data`: Uses the `putImageData()` method to set the pixel data directly on the canvas context.
4. `fillRect/backtick`: Employs template literals (backticks) to format the RGBA color string.

**Options Compared**

The test cases compare the performance of different approaches to set a single pixel color:

* Concatenation vs. `join()` for building the RGBA color string
* Using `putImageData()` vs. simple string concatenation or backtick formatting

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **Concatenation (`fillRect/concat`)**:
	* Pros: Simple, widely supported, and efficient.
	* Cons: May be slower due to string concatenation overhead.
2. **Join (`fillRect/join`)**:
	* Pros: Faster than concatenation due to optimized `join()` method implementation.
	* Cons: Requires JavaScript 1.5+ for native `join()` support.
3. **Put Image Data (`1×1 Image Data`)**:
	* Pros: Can be faster and more efficient, especially when dealing with large pixel arrays.
	* Cons: May require additional memory allocations and copies due to the `putImageData()` method's behavior.

**Other Considerations**

* The use of template literals (backticks) in `fillRect/backtick` is a relatively new feature introduced in JavaScript 2015. While it provides a more concise way to format strings, its performance impact may vary depending on the specific browser and implementation.
* The test cases do not account for potential differences in hardware acceleration or canvas rendering optimizations between browsers.

**Alternatives**

Other alternatives that could be explored include:

* Using `canvas.toDataURL()` to generate an image URL from the pixel data, which might offer a different performance profile compared to setting individual pixels directly.
* Implementing custom, platform-agnostic string formatting functions to optimize the RGBA color string construction.
* Comparing performance with different canvas rendering modes or contexts (e.g., `requestAnimationFrame()`, Web Workers).

Keep in mind that these alternatives would require additional benchmarking and testing to validate their performance impact.

Related benchmarks:

Setting Canvas Pixel with extra test case using backtick (version: 0)

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

Created: 6 years ago by: Guest

Jump to the latest result

fillRect/concat

fillRect/join

1×1 Image Data

fillRect/backtick

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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