@tldraw/editor/dist-esm/lib/utils/browserCanvasMaxSize.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../../src/lib/utils/browserCanvasMaxSize.ts"],
  "sourcesContent": ["/** @internal */\nexport interface CanvasMaxSize {\n\tmaxWidth: number\n\tmaxHeight: number\n\tmaxArea: number\n}\n\n// Cache this, only want to do this once per browser session\nlet maxCanvasSizes: CanvasMaxSize | null = null\n\nfunction getBrowserCanvasMaxSize(): CanvasMaxSize {\n\tif (!maxCanvasSizes) {\n\t\tmaxCanvasSizes = {\n\t\t\tmaxWidth: getCanvasSize('width'), // test very wide but 1 pixel tall canvases\n\t\t\tmaxHeight: getCanvasSize('height'), // test very tall but 1 pixel wide canvases\n\t\t\tmaxArea: getCanvasSize('area'), // test square canvases\n\t\t}\n\t}\n\treturn maxCanvasSizes\n}\n\n/*!\n * Extracted from https://github.com/jhildenbiddle/canvas-size\n * MIT License: https://github.com/jhildenbiddle/canvas-size/blob/master/LICENSE\n * Copyright (c) John Hildenbiddle\n */\n\nconst MAX_SAFE_CANVAS_DIMENSION = 8192\nconst MAX_SAFE_CANVAS_AREA = 4096 * 4096\n\nconst TEST_SIZES = {\n\tarea: [\n\t\t// Chrome 70 (Mac, Win)\n\t\t// Chrome 68 (Android 4.4)\n\t\t// Edge 17 (Win)\n\t\t// Safari 7-12 (Mac)\n\t\t16384,\n\t\t// Chrome 68 (Android 7.1-9)\n\t\t14188,\n\t\t// Chrome 68 (Android 5)\n\t\t11402,\n\t\t// Firefox 63 (Mac, Win)\n\t\t11180,\n\t\t// Chrome 68 (Android 6)\n\t\t10836,\n\t\t// IE 9-11 (Win)\n\t\t8192,\n\t\t// IE Mobile (Windows Phone 8.x)\n\t\t// Safari (iOS 9 - 12)\n\t\t4096,\n\t],\n\theight: [\n\t\t// Safari 7-12 (Mac)\n\t\t// Safari (iOS 9-12)\n\t\t8388607,\n\t\t// Chrome 83 (Mac, Win)\n\t\t65535,\n\t\t// Chrome 70 (Mac, Win)\n\t\t// Chrome 68 (Android 4.4-9)\n\t\t// Firefox 63 (Mac, Win)\n\t\t32767,\n\t\t// Edge 17 (Win)\n\t\t// IE11 (Win)\n\t\t16384,\n\t\t// IE 9-10 (Win)\n\t\t8192,\n\t\t// IE Mobile (Windows Phone 8.x)\n\t\t4096,\n\t],\n\twidth: [\n\t\t// Safari 7-12 (Mac)\n\t\t// Safari (iOS 9-12)\n\t\t4194303,\n\t\t// Chrome 83 (Mac, Win)\n\t\t65535,\n\t\t// Chrome 70 (Mac, Win)\n\t\t// Chrome 68 (Android 4.4-9)\n\t\t// Firefox 63 (Mac, Win)\n\t\t32767,\n\t\t// Edge 17 (Win)\n\t\t// IE11 (Win)\n\t\t16384,\n\t\t// IE 9-10 (Win)\n\t\t8192,\n\t\t// IE Mobile (Windows Phone 8.x)\n\t\t4096,\n\t],\n} as const\n\n/**\n * Tests ability to read pixel data from canvas elements of various dimensions\n * by decreasing canvas height and/or width until a test succeeds.\n */\nexport function getCanvasSize(dimension: 'width' | 'height' | 'area') {\n\tconst cropCvs = document.createElement('canvas')\n\tcropCvs.width = 1\n\tcropCvs.height = 1\n\tconst cropCtx = cropCvs.getContext('2d')!\n\n\tfor (const size of TEST_SIZES[dimension]) {\n\t\tconst w = dimension === 'height' ? 1 : size\n\t\tconst h = dimension === 'width' ? 1 : size\n\n\t\tconst testCvs = document.createElement('canvas')\n\t\ttestCvs.width = w\n\t\ttestCvs.height = h\n\t\tconst testCtx = testCvs.getContext('2d')!\n\n\t\ttestCtx.fillRect(w - 1, h - 1, 1, 1)\n\t\tcropCtx.drawImage(testCvs, w - 1, h - 1, 1, 1, 0, 0, 1, 1)\n\n\t\tconst isTestPassed = cropCtx.getImageData(0, 0, 1, 1).data[3] !== 0\n\t\t// release memory\n\t\ttestCvs.width = 0\n\t\ttestCvs.height = 0\n\n\t\tif (isTestPassed) {\n\t\t\t// release memory\n\t\t\tcropCvs.width = 0\n\t\t\tcropCvs.height = 0\n\n\t\t\tif (dimension === 'area') {\n\t\t\t\treturn size * size\n\t\t\t} else {\n\t\t\t\treturn size\n\t\t\t}\n\t\t}\n\t}\n\n\t// didn't find a good size, release memory and error\n\tcropCvs.width = 0\n\tcropCvs.height = 0\n\n\tthrow Error('Failed to determine maximum canvas dimension')\n}\n\n/** @internal */\nexport function clampToBrowserMaxCanvasSize(width: number, height: number) {\n\tif (\n\t\twidth <= MAX_SAFE_CANVAS_DIMENSION &&\n\t\theight <= MAX_SAFE_CANVAS_DIMENSION &&\n\t\twidth * height <= MAX_SAFE_CANVAS_AREA\n\t) {\n\t\treturn [width, height]\n\t}\n\n\tconst { maxWidth, maxHeight, maxArea } = getBrowserCanvasMaxSize()\n\tconst aspectRatio = width / height\n\n\tif (width > maxWidth) {\n\t\twidth = maxWidth\n\t\theight = width / aspectRatio\n\t}\n\n\tif (height > maxHeight) {\n\t\theight = maxHeight\n\t\twidth = height * aspectRatio\n\t}\n\n\tif (width * height > maxArea) {\n\t\tconst ratio = Math.sqrt(maxArea / (width * height))\n\t\twidth *= ratio\n\t\theight *= ratio\n\t}\n\n\treturn [width, height]\n}\n"],
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