Benchmark: Canvas roundrect perf

HTML Preparation code:

<canvas id="canvas1" width="512" height="512"></canvas>

<style>
 canvas { border: 1px solid black; }
</style>

<script>
var canvas = document.getElementById('canvas1');
var ctx = canvas.getContext('2d');

</script>

Tests:

Own roundRect
function roundRect(canvas, x, y, w, h, r) { if (w < 2 * r) r = Math.round(w / 2); if (h < 2 * r) r = Math.round(h / 2); canvas.beginPath(); canvas.moveTo(x + r, y); canvas.arcTo(x + w, y, x + w, y + h, r); canvas.arcTo(x + w, y + h, x, y + h, r); canvas.arcTo(x, y + h, x, y, r); canvas.arcTo(x, y, x + w, y, r); canvas.closePath(); } roundRect(ctx, 10, 10, 200, 100, 20);
roundRect
ctx.roundRect(10, 10, 200, 100, 20);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Own roundRect
roundRect

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
Own roundRect	2475950.8 Ops/sec
roundRect	2063494.8 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 Definition and test cases.

**Benchmark Definition:**
The provided JSON defines two benchmarking scenarios for measuring the performance of JavaScript code that draws a rounded rectangle using the 2D drawing context (`ctx`) on a canvas element.

**Options Compared:**

1. **Native `roundRect` method**: The first benchmark definition uses the native `roundRect` method available on the `ctx` object, which is implemented in the browser's rendering engine.
2. **Custom `roundRect` function**: The second benchmark definition defines a custom `roundRect` function that takes five arguments (`x`, `y`, `w`, `h`, and `r`) to calculate and draw the rounded rectangle.

**Pros and Cons of Each Approach:**

1. **Native `roundRect` method**:
	* Pros: Likely faster and more optimized since it's implemented in the browser's rendering engine.
	* Cons: May not be available on older browsers or with specific canvas features enabled.
2. **Custom `roundRect` function**:
	* Pros: Can provide more control over the drawing process, allowing for potential optimizations or edge cases that might be missed by the native implementation.
	* Cons: May introduce overhead due to the additional function call and calculation.

**Other Considerations:**

* The use of `Math.round()` to calculate the rounded radius (`r`) can lead to integer precision issues, potentially affecting performance.
* Using a custom function instead of the native method might require additional setup or dependencies.

**Library Usage:**
None mentioned in this benchmark definition.

**Special JS Features/Syntax:**
None explicitly mentioned. However, it's worth noting that the use of `var` for variable declarations is an older syntax (ES5). Modern JavaScript would typically use `let` or `const` instead.

**Alternative Approaches:**

* To measure the performance of other drawing functions or methods on the canvas element, additional benchmark definitions could be added.
* Using a different rendering engine or browser to compare performance might be necessary to accurately evaluate the native implementation's speed.
* Adding more test cases with varying input sizes, shapes, or complexity can help identify potential bottlenecks and optimize the custom `roundRect` function.

By analyzing these aspects of the benchmark definition, developers can better understand the trade-offs between using the native `roundRect` method versus implementing their own custom function.

Related benchmarks:

Canvas roundrect perf (version: 0)

Comparing performance of: Own roundRect vs roundRect

Created: 2 years ago by: Guest

Jump to the latest result

Own roundRect

roundRect

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):