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length = binaryString.length;\n const binaryArray = new Uint8Array(length);\n\n for (let i = 0; i < length; i++) {\n binaryArray[i] = binaryString.charCodeAt(i);\n }\n\n return new Blob([binaryArray], {\n type: 'image/png',\n });\n}\n\nexport async function getBlobFromCanvasAsync(\n canvas: HTMLCanvasElement,\n quality?: number\n): Promise<Blob> {\n if (canvas.toBlob) {\n return new Promise((resolve, reject) => {\n canvas.toBlob(\n blob => {\n if (blob == null) {\n reject('Failed to convert canvas to blob!');\n } else {\n resolve(blob);\n }\n },\n '2d',\n quality\n );\n });\n }\n return getBlobFromCanvasElement(canvas);\n}\n\nexport function resolveUrl(url: string, baseUrl: string): string {\n const doc = document.implementation.createHTMLDocument();\n const base = doc.createElement('base');\n doc.head.appendChild(base);\n const a = doc.createElement('a');\n doc.body.appendChild(a);\n base.href = baseUrl;\n a.href = url;\n return a.href;\n}\n\nexport function getImageElementFromURIAsync(uri: string): Promise<HTMLImageElement> {\n return new Promise((resolve, reject) => {\n const image = new Image();\n image.onload = () => {\n resolve(image);\n };\n image.onerror = () => {\n reject(`Image could not be loaded ${image.src}`);\n };\n image.src = uri;\n });\n}\n\nexport function getSourceAndEncodeAsync(\n url: string,\n preventCaching: boolean = false,\n missingImageSource: string | undefined = undefined\n): Promise<string> {\n const TIMEOUT = 30000;\n if (preventCaching) {\n // Cache bypass so we dont have CORS issues with cached images\n // Source: https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache\n url += (/\\?/.test(url) ? '&' : '?') + Date.now();\n }\n\n return new Promise(resolve => {\n const request = new XMLHttpRequest();\n\n request.onreadystatechange = done;\n request.ontimeout = timeout;\n request.responseType = 'blob';\n request.timeout = TIMEOUT;\n request.open('GET', url, true);\n request.send();\n\n let placeholder;\n if (missingImageSource) {\n const split = missingImageSource.split(/,/);\n if (split && split[1]) {\n placeholder = split[1];\n }\n }\n\n function done() {\n if (request.readyState !== 4) {\n return;\n }\n\n if (request.status !== 200) {\n if (placeholder) {\n resolve(placeholder);\n } else {\n fail(`cannot fetch resource: ${url}, status: ${request.status}`);\n }\n\n return;\n }\n\n const encoder = new FileReader();\n\n encoder.onloadend = () => {\n const { result } = encoder;\n if (typeof result === 'string') {\n const content = result.split(/,/)[1];\n resolve(content);\n } else {\n resolve('');\n }\n };\n encoder.readAsDataURL(request.response);\n }\n\n function timeout(): void {\n if (placeholder) {\n resolve(placeholder);\n } else {\n fail(`timeout of ${TIMEOUT}ms occured while fetching resource: ${url}`);\n }\n }\n\n function fail(message: string): void {\n throw new Error(message);\n }\n });\n}\n\nexport function formatDataAsUrl(content: string, type: string): string {\n return `data:${type};base64,${content}`;\n}\n\nexport function getEscapedString(string: string): string {\n return string.replace(/([.*+?^${}()|\\[\\]\\/\\\\])/g, '\\\\$1');\n}\n\nexport function getEscapedXHTMLString(input: string): string {\n return input.replace(/#/g, '%23').replace(/\\n/g, '%0A');\n}\n\nexport function getWidthForElement(element: Element): number {\n const rightBorder = getPixelSizeForStyleProperty(element, 'border-right-width');\n const leftBorder = getPixelSizeForStyleProperty(element, 'border-left-width');\n return element.scrollWidth + rightBorder + leftBorder;\n}\n\nexport function getHeightForElement(element: Element): number {\n const bottomBorder = getPixelSizeForStyleProperty(element, 'border-bottom-width');\n const topBorder = getPixelSizeForStyleProperty(element, 'border-top-width');\n return element.scrollHeight + bottomBorder + topBorder;\n}\n\nfunction getPixelSizeForStyleProperty(element: Element, styleProperty: string): number {\n const value = window.getComputedStyle(element).getPropertyValue(styleProperty);\n return parseFloat(value.replace('px', ''));\n}\n"]} |