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drawPixel(output, pos, ...color) is slow
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>benchmark</title> | |
| </head> | |
| <body> | |
| Open DevTools | |
| <script> | |
| setTimeout(function() { | |
| "use strict" | |
| const length = 100000000; | |
| const output = new Uint8ClampedArray(length); | |
| const color = [255, 255, 255]; | |
| function bench(name, fn) { | |
| const date = Date.now(); | |
| fn(); | |
| console.log(name, "// => ", Date.now() - date, "ms"); | |
| } | |
| bench("drawPixel(output, pos, ...color)", function() { | |
| for (let pos = 0; pos < length; pos++) { | |
| drawPixel(output, pos, ...color); | |
| } | |
| }); | |
| bench("drawPixel(output, pos, color[0], color[1], color[2])", function() { | |
| for (let pos = 0; pos < length; pos++) { | |
| drawPixel(output, pos, color[0], color[1], color[2]); | |
| } | |
| }); | |
| bench("drawColorFn(output, color)(pos)", function() { | |
| const drawPixel = drawColorFn(output, color); | |
| for (let pos = 0; pos < length; pos++) { | |
| drawPixel(pos); | |
| } | |
| }); | |
| function drawPixel(output, pos, r, g, b) { | |
| output[pos + 0] = r; | |
| output[pos + 1] = g; | |
| output[pos + 2] = b; | |
| output[pos + 3] = 255; | |
| } | |
| function drawColorFn(output, c) { | |
| const r = c[0]; | |
| const g = c[1]; | |
| const b = c[2]; | |
| return function(pos) { | |
| output[pos + 0] = r; | |
| output[pos + 1] = g; | |
| output[pos + 2] = b; | |
| output[pos + 3] = 255; | |
| }; | |
| } | |
| }, 1); | |
| </script> | |
| </body> | |
| </html> |
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