feature: Add web support #131
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| import type { Spec } from './NativeRNCImageEditor'; | ||
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| type ImageCropDataFromSpec = Parameters<Spec['cropImage']>[1]; | ||
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| export interface ImageCropData | ||
| extends Omit<ImageCropDataFromSpec, 'resizeMode'> { | ||
| resizeMode?: 'contain' | 'cover' | 'stretch'; | ||
| // ^^^ codegen doesn't support union types yet | ||
| // so to provide more type safety we override the type here | ||
| format?: 'png' | 'jpeg' | 'webp'; // web only | ||
| } | ||
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| function drawImage( | ||
| img: HTMLImageElement, | ||
| { offset, size, displaySize }: ImageCropData | ||
| ): HTMLCanvasElement { | ||
| const canvas = document.createElement('canvas'); | ||
| const context = canvas.getContext('2d'); | ||
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| if (!context) { | ||
| throw new Error('Failed to get canvas context'); | ||
| } | ||
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| const sx = offset.x, | ||
| sy = offset.y, | ||
| sWidth = size.width, | ||
| sHeight = size.height, | ||
| dx = 0, | ||
| dy = 0, | ||
| dWidth = displaySize?.width ?? sWidth, | ||
| dHeight = displaySize?.height ?? sHeight; | ||
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| canvas.width = dWidth; | ||
| canvas.height = dHeight; | ||
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| context.drawImage(img, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight); | ||
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| return canvas; | ||
| } | ||
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| function fetchImage(imgSrc: string): Promise<HTMLImageElement> { | ||
| return new Promise<HTMLImageElement>((resolve, reject) => { | ||
| const onceOptions = { once: true }; | ||
| const img = new Image(); | ||
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| function onImageError(event: ErrorEvent) { | ||
| reject(event); | ||
| } | ||
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| function onLoad() { | ||
| resolve(img); | ||
| } | ||
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| img.addEventListener('error', onImageError, onceOptions); | ||
| img.addEventListener('load', onLoad, onceOptions); | ||
| img.crossOrigin = 'anonymous'; | ||
| img.src = imgSrc; | ||
| }); | ||
| } | ||
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| class ImageEditor { | ||
| static cropImage(imgSrc: string, cropData: ImageCropData): Promise<string> { | ||
| /** | ||
| * Returns a promise that resolves with the base64 encoded string of the cropped image | ||
| */ | ||
| return fetchImage(imgSrc).then(function onfulfilledImgToCanvas(image) { | ||
| const canvas = drawImage(image, cropData); | ||
| return canvas.toDataURL( | ||
| `image/${cropData.format ?? 'jpeg'}`, | ||
| cropData.quality ?? 1 | ||
| ); | ||
| }); | ||
| } | ||
| } | ||
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| export default ImageEditor; | ||
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You can update that iOS supports
PNGas wellThere was a problem hiding this comment.
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PNG uses lossless compression, that's why
UIImagePNGRepresentationdoes not acceptcompressionQualityparameter likeUIImageJPEGRepresentationdoes, see:react-native-image-editor/ios/RNCImageEditor.mm
Lines 113 to 121 in 47a2c57