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Compare of different Canvas Context2D properties RW
(version: 0)
Compare of different Canvas Context2D properties RW
Comparing performance of:
Fill Color Read vs Fill Color Write vs Line width read vs Line width write vs Custom Property Read vs Custom Property Write
Created:
5 years ago
by:
Guest
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Script Preparation code:
window.ctx = document.createElement('canvas').getContext('2d'); ctx.customProp = 2;
Tests:
Fill Color Read
const fillColor = ctx.fillStyle
Fill Color Write
ctx.fillStyle = 'rgba(255, 0, 0, 0.5)';
Line width read
const lineWidth = ctx.lineWidth;
Line width write
ctx.lineWidth = 2;
Custom Property Read
const customProp = ctx.customProp;
Custom Property Write
ctx.customProp = 2;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (6)
Previous results
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Test case name
Result
Fill Color Read
Fill Color Write
Line width read
Line width write
Custom Property Read
Custom Property Write
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested, the different approaches compared, their pros and cons, and other considerations. **Benchmark Overview** The benchmark measures the performance of different properties in the `Canvas Context2D` API, specifically: 1. Reading and writing fill color (`fillStyle`) 2. Reading and writing line width (`lineWidth`) 3. Reading and writing a custom property (`customProp`) **Approaches Compared** There are three approaches compared: ### 1. Direct Property Access This approach involves directly accessing the `fillStyle`, `lineWidth`, or `customProp` properties. Pros: Simple, straightforward access to the properties. Cons: May involve unnecessary computations or memory allocations if the property is not cached or optimized. Example: ```javascript const fillColor = ctx.fillStyle; ``` ### 2. Property Assignment and Read This approach involves assigning a value to the property (e.g., `fillStyle`) followed by reading its current value. Pros: May optimize caching or computations for the property. Cons: Introduces additional overhead due to assignment and read operations. Example: ```javascript ctx.fillStyle = 'rgba(255, 0, 0, 0.5)'; const fillColor = ctx.fillStyle; ``` ### 3. Property Read-Write-Read (RW-RW-R) This approach involves reading the property's initial value, assigning a new value, and then reading the updated value. Pros: May optimize caching or computations for the property by reusing the cached value. Cons: Introduces additional overhead due to repeated reads and writes. Example: ```javascript const lineWidth = ctx.lineWidth; ctx.lineWidth = 2; const lineWidthUpdated = ctx.lineWidth; ``` **Library Used** The `Canvas Context2D` API is a built-in JavaScript library for working with 2D graphics in web browsers. The `customProp` property is not part of the standard Canvas API, suggesting that it's a custom or experimental feature. **Special JS Feature/Syntax** There is no special JavaScript feature or syntax used in this benchmark. However, it's worth noting that the use of `customProp` suggests that the benchmark may be testing a non-standard or experimental feature. **Other Alternatives** If you're interested in comparing different Canvas API properties, here are some alternative approaches: * Use other properties like `strokeStyle`, `strokeWidth`, or `fillOpacity`. * Compare performance with and without caching or optimization. * Experiment with different rendering contexts (e.g., `CanvasRenderingContext2D` vs. `WebGLContext2`). **Benchmark Preparation Code** The provided script preparation code creates a new `canvas` element, gets its 2D drawing context (`ctx`), and sets the `customProp` property to `2`. **Individual Test Cases** Each test case is defined by a JSON object with two properties: * `Benchmark Definition`: The JavaScript code that defines the benchmark. * `Test Name`: A descriptive name for the test case. These test cases cover different aspects of the Canvas API, such as reading and writing fill color, line width, and custom property values.
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