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chore(TS): Converting the filtering backend to ts + es6 (#8403)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,78 +1,64 @@ | ||
| //@ts-nocheck | ||
| (function (global) { | ||
| var fabric = global.fabric, | ||
| noop = function () {}; | ||
| /** | ||
| * Canvas 2D filter backend. | ||
| */ | ||
| import { T2DPipelineState } from './typedefs'; | ||
|
|
||
| fabric.Canvas2dFilterBackend = Canvas2dFilterBackend; | ||
| export class Canvas2dFilterBackend { | ||
| /** | ||
| * Experimental. This object is a sort of repository of help layers used to avoid | ||
| * of recreating them during frequent filtering. If you are previewing a filter with | ||
| * a slider you probably do not want to create help layers every filter step. | ||
| * in this object there will be appended some canvases, created once, resized sometimes | ||
| * cleared never. Clearing is left to the developer. | ||
| **/ | ||
| resources = {}; | ||
|
|
||
| /** | ||
| * Canvas 2D filter backend. | ||
| * Apply a set of filters against a source image and draw the filtered output | ||
| * to the provided destination canvas. | ||
| * | ||
| * @param {EnhancedFilter} filters The filter to apply. | ||
| * @param {HTMLImageElement|HTMLCanvasElement} sourceElement The source to be filtered. | ||
| * @param {Number} sourceWidth The width of the source input. | ||
| * @param {Number} sourceHeight The height of the source input. | ||
| * @param {HTMLCanvasElement} targetCanvas The destination for filtered output to be drawn. | ||
| */ | ||
| function Canvas2dFilterBackend() {} | ||
|
|
||
| Canvas2dFilterBackend.prototype = | ||
| /** @lends fabric.Canvas2dFilterBackend.prototype */ { | ||
| evictCachesForKey: noop, | ||
| dispose: noop, | ||
| clearWebGLCaches: noop, | ||
|
|
||
| /** | ||
| * Experimental. This object is a sort of repository of help layers used to avoid | ||
| * of recreating them during frequent filtering. If you are previewing a filter with | ||
| * a slider you probably do not want to create help layers every filter step. | ||
| * in this object there will be appended some canvases, created once, resized sometimes | ||
| * cleared never. Clearing is left to the developer. | ||
| **/ | ||
| resources: {}, | ||
|
|
||
| /** | ||
| * Apply a set of filters against a source image and draw the filtered output | ||
| * to the provided destination canvas. | ||
| * | ||
| * @param {EnhancedFilter} filters The filter to apply. | ||
| * @param {HTMLImageElement|HTMLCanvasElement} sourceElement The source to be filtered. | ||
| * @param {Number} sourceWidth The width of the source input. | ||
| * @param {Number} sourceHeight The height of the source input. | ||
| * @param {HTMLCanvasElement} targetCanvas The destination for filtered output to be drawn. | ||
| */ | ||
| applyFilters: function ( | ||
| filters, | ||
| sourceElement, | ||
| sourceWidth, | ||
| sourceHeight, | ||
| targetCanvas | ||
| ) { | ||
| var ctx = targetCanvas.getContext('2d'); | ||
| ctx.drawImage(sourceElement, 0, 0, sourceWidth, sourceHeight); | ||
| var imageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight); | ||
| var originalImageData = ctx.getImageData( | ||
| 0, | ||
| 0, | ||
| sourceWidth, | ||
| sourceHeight | ||
| ); | ||
| var pipelineState = { | ||
| sourceWidth: sourceWidth, | ||
| sourceHeight: sourceHeight, | ||
| imageData: imageData, | ||
| originalEl: sourceElement, | ||
| originalImageData: originalImageData, | ||
| canvasEl: targetCanvas, | ||
| ctx: ctx, | ||
| filterBackend: this, | ||
| }; | ||
| filters.forEach(function (filter) { | ||
| filter.applyTo(pipelineState); | ||
| }); | ||
| if ( | ||
| pipelineState.imageData.width !== sourceWidth || | ||
| pipelineState.imageData.height !== sourceHeight | ||
| ) { | ||
| targetCanvas.width = pipelineState.imageData.width; | ||
| targetCanvas.height = pipelineState.imageData.height; | ||
| } | ||
| ctx.putImageData(pipelineState.imageData, 0, 0); | ||
| return pipelineState; | ||
| }, | ||
| applyFilters( | ||
| filters: any[], | ||
| sourceElement: HTMLImageElement | HTMLCanvasElement, | ||
| sourceWidth: number, | ||
| sourceHeight: number, | ||
| targetCanvas: HTMLCanvasElement | ||
| ): T2DPipelineState | void { | ||
| const ctx = targetCanvas.getContext('2d'); | ||
| if (!ctx) { | ||
| return; | ||
| } | ||
| ctx.drawImage(sourceElement, 0, 0, sourceWidth, sourceHeight); | ||
| const imageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight); | ||
| const originalImageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight); | ||
| const pipelineState: T2DPipelineState = { | ||
| sourceWidth, | ||
| sourceHeight, | ||
| imageData, | ||
| originalEl: sourceElement, | ||
| originalImageData, | ||
| canvasEl: targetCanvas, | ||
| ctx, | ||
| filterBackend: this, | ||
| }; | ||
| })(typeof exports !== 'undefined' ? exports : window); | ||
| filters.forEach(function (filter) { | ||
| filter.applyTo(pipelineState); | ||
| }); | ||
| const { imageData: imageDataPostFilter } = pipelineState; | ||
| if ( | ||
| imageDataPostFilter.width !== sourceWidth || | ||
| imageDataPostFilter.height !== sourceHeight | ||
| ) { | ||
| targetCanvas.width = imageDataPostFilter.width; | ||
| targetCanvas.height = imageDataPostFilter.height; | ||
| } | ||
| ctx.putImageData(imageDataPostFilter, 0, 0); | ||
| return pipelineState; | ||
| } | ||
| } |
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