Benchmark: Setting Canvas Pixel with preformat

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; d[0] = px.r; d[1] = px.g; d[2] = px.b; d[3] = px.a; $ctx.putImageData($px, px.x, px.y); }
fillrect/preformat
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/preformat

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided benchmark measures the performance of four different approaches to draw a single pixel on a canvas element in JavaScript.

**Approaches Compared**

1. **Preformatted string concatenation**: This approach uses string concatenation to build the `rgba` color string, e.g., `"rgba(${px.r}, ${px.g}, ${px.b}, ${(px.a / 255)}``.
2. **Array.join() method**: This approach uses the `join()` method to concatenate the array elements into a single string, e.g., `[px.r,px.g,px.b,px.a/255].join()`.
3. **Image Data manipulation**: This approach directly manipulates the image data using `putImageData`, e.g., `$ctx.putImageData($px, px.x, px.y)`.
4. **Template literal (preformatted string)**: This approach uses a template literal to build the `rgba` color string, e.g., `rgba(${px.r}, ${px.g}, ${px.b}, ${(px.a / 255)})`.

**Pros and Cons of Each Approach**

1. **Preformatted string concatenation**: Pros:
	* Easy to read and maintain.
	* Fast performance due to direct string manipulation.
Cons:
	* Less readable for complex color values.
2. **Array.join() method**: Pros:
	* More readable than preformatted string concatenation for complex color values.
Cons:
	* Slower performance due to string creation and concatenation.
3. **Image Data manipulation**: Pros:
	* Fast performance due to native image data manipulation.
Cons:
	* Less readable for JavaScript developers without image processing expertise.
4. **Template literal (preformatted string)**: Pros:
	* More readable than preformatted string concatenation for complex color values.
Cons:
	* May have slower performance due to template literal compilation.

**Library and Syntax**

No external libraries are used in this benchmark, only native JavaScript features.

**Special JS Feature or Syntax**

None mentioned in the benchmark definition.

**Other Alternatives**

Alternative approaches to drawing a single pixel on a canvas element could include:

1. Using `CanvasRenderingContext2D.createImageData()` and `fillRect()`.
2. Using `WebGL` and `Buffer` APIs.
3. Using `Pixi.js` or other libraries optimized for 2D rendering.

Note that these alternatives may have different performance characteristics, readability, and maintainability compared to the approaches tested in this benchmark.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36

Browser/OS: Chrome 95 on Windows

View result in a separate tab

Test name	Executions per second
fillRect/concat	702.7 Ops/sec
fillRect/join	648.3 Ops/sec
1×1 Image Data	107.4 Ops/sec
fillrect/preformat	516.8 Ops/sec

Related benchmarks:

Setting Canvas Pixel with preformat (version: 0)

Added additional test to test using preformatted strings vs concat vs join

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

Created: 2 years ago by: Guest

Jump to the latest result

fillRect/concat

fillRect/join

1×1 Image Data

fillrect/preformat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):