Benchmark: drawImage() scaling up & down performance

Script Preparation code:

$sourceWidth = 1000;
$sourceHeight = 1000;
$sourceCanvas = document.createElement("canvas");
$sourceCanvas.width = $sourceWidth;
$sourceCanvas.height = $sourceHeight;
$sourceContext = $sourceCanvas.getContext("2d");
$sourceContext.fillStyle = "rgba(0,100,200,1)";
$sourceContext.fillRect(0, 0, $sourceWidth, $sourceHeight);

$destCanvas = document.createElement("canvas");
$destCanvas.width = 3000;
$destCanvas.height = 3000;
$destContext = $destCanvas.getContext("2d");

Tests:

Scaling from a small canvas area to a small canvas area (no scaling)
$destContext.drawImage($sourceCanvas, 0, 0, $sourceWidth, $sourceHeight, 0, 0, $sourceWidth, $sourceHeight); // Force the drawImage call to be evaluated within this benchmark code: $destContext.getImageData(0, 0, 1, 1);
Scaling from a small canvas area to a smaller canvas area
$destContext.drawImage($sourceCanvas, 0, 0, $sourceWidth, $sourceHeight, 0, 0, 100, 100); // Force the drawImage call to be evaluated within this benchmark code: $destContext.getImageData(0, 0, 1, 1);
Scaling from a small canvas area to a large canvas area
$destContext.drawImage($sourceCanvas, 0, 0, $sourceWidth, $sourceHeight, 0, 0, 3000, 3000); // Force the drawImage call to be evaluated within this benchmark code: $destContext.getImageData(0, 0, 1, 1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Scaling from a small canvas area to a small canvas area (no scaling)
Scaling from a small canvas area to a smaller canvas area
Scaling from a small canvas area to a large canvas area

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 16 on iOS 16.2

View result in a separate tab

Test name	Executions per second
Scaling from a small canvas area to a small canvas area (no scaling)	778.2 Ops/sec
Scaling from a small canvas area to a smaller canvas area	1142.0 Ops/sec
Scaling from a small canvas area to a large canvas area	229.1 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is tested on the provided JSON?**

The provided JSON represents a JavaScript benchmark test case that measures the performance of the `drawImage()` method in scaling an image within a canvas element.

**Options compared:**

There are three options being compared:

1. **Scaling from a small canvas area to a small canvas area (no scaling)**: The source canvas is not scaled, and the destination canvas has a larger size.
2. **Scaling from a small canvas area to a smaller canvas area**: The source canvas is scaled down to fit within a smaller rectangle on the destination canvas.
3. **Scaling from a small canvas area to a large canvas area**: The source canvas is scaled up to fill an even larger rectangle on the destination canvas.

**Pros and cons of each approach:**

1. **No scaling (small to small)**:
	* Pros: This option measures the performance of drawing without any scaling, which can provide insights into basic rendering capabilities.
	* Cons: It may not accurately represent real-world use cases where images are frequently scaled.
2. **Scaling down (small to smaller)**:
	* Pros: This option simulates a common scenario where images need to be resized for various purposes, such as thumbnail generation or image compression.
	* Cons: The scaling process might introduce additional computational overhead that could affect performance.
3. **Scaling up (small to large)**:
	* Pros: This option measures the performance of drawing with significant scaling, which can help identify potential bottlenecks in rendering images at larger sizes.
	* Cons: It may require more processing power and memory compared to the other options.

**Library used:**

The `Canvas` API is used to create canvas elements and access their 2D drawing contexts. The `drawImage()` method is used to draw the scaled image onto the destination canvas.

**Special JavaScript features or syntax:**

None mentioned in this benchmark test case. However, it's worth noting that other test cases might use specific JavaScript features like ES6 classes, async/await, or promises to simulate real-world scenarios.

**Alternative approaches:**

To improve performance, consider the following alternatives:

1. **Use a more efficient image scaling algorithm**: Instead of using the `drawImage()` method, which can be slow due to the need for multiple render passes, consider using a library like `sharp` or `imageio` that provides optimized image processing functions.
2. **Optimize canvas context settings**: Adjust the canvas context's pixel density and other properties to optimize rendering performance.
3. **Use Web Workers**: Offload image scaling tasks to separate threads to take advantage of multi-core processors.

Keep in mind that these alternatives may require additional development effort and might not be compatible with all browsers or platforms.

Related benchmarks:

drawImage() scaling up & down performance (version: 0)

Comparing performance of: Scaling from a small canvas area to a small canvas area (no scaling) vs Scaling from a small canvas area to a smaller canvas area vs Scaling from a small canvas area to a large canvas area

Created: one year ago by: Guest

Jump to the latest result

Scaling from a small canvas area to a small canvas area (no scaling)

Scaling from a small canvas area to a smaller canvas area

Scaling from a small canvas area to a large canvas area

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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