Benchmark: NO GETIMAGEDATA! PutImageData vs just DrawImage

HTML Preparation code:

<canvas id='master' width='100' height='100'></canvas>master<br><br>
<canvas id='pid' width='100' height='100'></canvas>pid1<br><br>
<canvas id='di' width='100' height='100'></canvas>di1<br><br>
<canvas id='pid2' width='100' height='100'></canvas>pid2<br><br>
<canvas id='di2' width='100' height='100'></canvas>di2

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');
var pid2 = document.getElementById('pid2').getContext('2d');
var di2 = document.getElementById('di2').getContext('2d');

masterctx.fillRect(0,0,50,50);
masterctx.fillStyle = "red";
masterctx.fillRect(50,50,100,100);

var imgData = masterctx.getImageData(0,0,100,100);
var imgDatas = masterctx.getImageData(25,0,50,100);

Tests:

DrawImage whole master into di canvas
di.drawImage(master,0,0);
PutImageData whole master into pid canvas
pid.putImageData(imgData,0,0);
DrawImage half master into di2 canvas
di2.drawImage(master,25,0,50,100,25,0,50,100);
PutImageData half master into pid2 canvas
pid2.putImageData(imgDatas,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 di2 canvas
PutImageData half master into pid2 canvas

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Windows

View result in a separate tab

Test name	Executions per second
DrawImage whole master into di canvas	271356.2 Ops/sec
PutImageData whole master into pid canvas	24757.6 Ops/sec
DrawImage half master into di2 canvas	293920.6 Ops/sec
PutImageData half master into pid2 canvas	24470.7 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 world of JavaScript benchmarks!

The provided benchmark measures the performance difference between two approaches: `DrawImage` and `PutImageData`. We'll break down each test case, explore the options being compared, and discuss their pros and cons.

**Test Case 1:** DrawImage whole master into di canvas

```javascript
di.drawImage(master,0,0);
```

In this test case, the entire canvas (`master`) is drawn onto another canvas (`di`) using `DrawImage`. The browser has to create a new image from scratch for each execution.

**Pros:**

* Simple and efficient (no need to store image data)
* Suitable for real-time graphics rendering

**Cons:**

* Can be slow due to frequent canvas creation
* May not perform well on older browsers or low-end hardware

**Test Case 2:** PutImageData whole master into pid canvas

```javascript
pid.putImageData(imgData,0,0);
```

In this test case, the entire canvas (`master`) is stored as image data (`imgData`) and then drawn onto another canvas (`pid`). This approach stores the image data once and reuses it.

**Pros:**

* Can be faster than DrawImage (no need to create new images)
* Suitable for situations where the same image needs to be drawn multiple times

**Cons:**

* Requires extra memory storage for image data
* May not perform well on older browsers or low-end hardware due to increased memory usage

**Test Case 3:** DrawImage half master into di2 canvas

```javascript
di2.drawImage(master,25,0,50,100,25,0,50,100);
```

In this test case, a portion of the original canvas (`master`) is drawn onto another canvas (`di2`). This approach can be faster than storing the entire image data.

**Pros:**

* Can be more efficient than storing the entire image data
* Suitable for situations where only a part of the image needs to be rendered

**Cons:**

* Requires manual calculation of the draw rectangle (can lead to errors)
* May not perform well on older browsers or low-end hardware due to increased complexity

**Test Case 4:** PutImageData half master into pid2 canvas

```javascript
pid2.putImageData(imgDatas,25,0);
```

In this test case, a portion of the original image data (`imgDatas`) is drawn onto another canvas (`pid2`). This approach can be faster than drawing the entire image using DrawImage.

**Pros:**

* Can be more efficient than drawing the entire image
* Suitable for situations where only a part of the image needs to be rendered

**Cons:**

* Requires extra memory storage for image data
* May not perform well on older browsers or low-end hardware due to increased memory usage

**Library:**

The `ImageBitmap` API is used in some test cases, but it's not explicitly mentioned in the benchmark definition. However, given the context, it's likely that `ImageBitmap` is being used behind the scenes to store and manipulate image data.

**Special JS feature:**

There doesn't appear to be any special JavaScript features or syntax used in this benchmark. The focus is on comparing the performance of two approaches (`DrawImage` and `PutImageData`) rather than showcasing advanced JavaScript features.

**Alternatives:**

Other alternatives for drawing images onto canvases include:

* Using `CanvasRenderingContext2D.drawImage()`: This method draws an image directly from a URL, not requiring explicit image data.
* Using `WebGL` or other 3D graphics APIs: These APIs provide more advanced rendering capabilities and may offer better performance in certain situations.

Keep in mind that the choice of approach depends on the specific requirements of your application. Drawing images onto canvases can be optimized for different scenarios, so it's essential to consider factors like performance, memory usage, and ease of use when selecting an approach.

Related benchmarks:

NO GETIMAGEDATA! PutImageData vs just DrawImage (version: 0)

v3

Comparing performance of: DrawImage whole master into di canvas vs PutImageData whole master into pid canvas vs DrawImage half master into di2 canvas vs PutImageData half master into pid2 canvas

Created: 4 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 di2 canvas

PutImageData half master into pid2 canvas

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):