Benchmark: PutImageData vs DrawImage 2

HTML Preparation code:

<canvas id='master' width='100' height='100'></canvas>
<canvas id='pid' width='100' height='100'></canvas>
<canvas id='di' width='100' height='100'></canvas>

Script Preparation code:

var master = document.getElementById('master');
var masterctx = master.getContext('2d');
var pid = document.getElementById('pid').getContext('2d');
var di = document.getElementById('di').getContext('2d');

masterctx.fillRect(0,0,50,50);
masterctx.fillStyle = "red";
masterctx.fillRect(50,50,100,100);

var imgData1 = masterctx.getImageData(0,0,100,100);
var imgData2 = masterctx.getImageData(25,0,75,100);

Tests:

DrawImage whole master into di canvas
di.drawImage(master,0,0);
PutImageData whole master into pid canvas
pid.putImageData(imgData1,0,0);
DrawImage half master into di canvas
di.drawImage(master,25,0,50,100,25,0,50,100);
PutImageData half master into pid canvas
pid.putImageData(imgData2,25,0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
DrawImage whole master into di canvas
PutImageData whole master into pid canvas
DrawImage half master into di canvas
PutImageData half master into pid canvas

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Overview**

The provided JSON represents a JavaScript benchmark test case on the MeasureThat.net website. The test compares the performance of two 2D graphics APIs in JavaScript: `DrawImage` and `PutImageData`. The test consists of four individual benchmark cases, each measuring the execution time of drawing or putting an image data object onto a canvas.

**Test Cases**

1. **DrawImage whole master into di canvas**
This test case draws the entire `master` image (a 50x100 red rectangle) onto the `di` canvas at position (0, 0).

2. **PutImageData whole master into pid canvas**
This test case puts the `imgData1` image data object onto the `pid` canvas at position (0, 0), where `imgData1` is a subset of the original `master` image (50x100 rectangle starting from x=25 and y=0).

3. **DrawImage half master into di canvas**
This test case draws only half of the `master` image (the bottom-right 50x100 rectangle) onto the `di` canvas at position (0, 25).

4. **PutImageData half master into pid canvas**
This test case puts a subset of the original `master` image (`imgData2`) onto the `pid` canvas at position (25, 0), which is similar to the previous case but with a different subset of pixels.

**Options Compared**

The two options compared are:

1. **DrawImage**: This method draws an image from its source context onto another destination context.
2. **PutImageData**: This method puts an image data object onto another canvas or image element, effectively "pasting" the image onto the target context.

**Pros and Cons of Each Approach**

* **DrawImage**:
	+ Pros: Generally faster and more efficient than `PutImageData`, especially for larger images.
	+ Cons: Requires a separate source image, which can lead to additional memory usage and potential performance bottlenecks if not handled carefully.
* **PutImageData**:
	+ Pros: Can be useful when working with small images or when the target context is already set up, reducing unnecessary overhead.
	+ Cons: Generally slower than `DrawImage` due to the need to create an image data object from a source pixel buffer.

**Library and Purpose**

The `getImageData()` method in JavaScript returns an `ImageData` object, which contains pixel data for a specified area of an image. The `putImageData()` method takes an `ImageData` object as an argument and places its pixels onto another canvas or image element. These methods are essential tools in 2D graphics programming.

**Special JS Feature**

There is no special JavaScript feature or syntax explicitly used in this benchmark, but the use of `requestAnimationFrame()` for animation and timing-related functionality is implicit, as MeasureThat.net generates these frames automatically during benchmarking.

**Other Alternatives**

If you were to create similar benchmarks using other 2D graphics APIs or methods, you might consider:

1. **CanvasRenderingContext2D.getImageData()`: This method can be used with `drawImage()` for creating an image data object from a source pixel buffer.
2. **WebGL**: An alternative approach would be to use WebGL (Web Graphics Library) for 2D graphics rendering, which is generally faster and more efficient than canvas-based methods like `DrawImage` or `PutImageData`.

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Windows

View result in a separate tab

Test name	Executions per second
DrawImage whole master into di canvas	387301.6 Ops/sec
PutImageData whole master into pid canvas	27808.7 Ops/sec
DrawImage half master into di canvas	386118.8 Ops/sec
PutImageData half master into pid canvas	27917.6 Ops/sec

Related benchmarks:

PutImageData vs DrawImage 2 (version: 0)

Compare PutImageData with DrawImage

Comparing performance of: DrawImage whole master into di canvas vs PutImageData whole master into pid canvas vs DrawImage half master into di canvas vs PutImageData half master into pid canvas

Created: 2 years ago by: Guest

Jump to the latest result

DrawImage whole master into di canvas

PutImageData whole master into pid canvas

DrawImage half master into di canvas

PutImageData half master into pid canvas

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):