fabric/dist/src/filters/Canvas2dFilterBackend.mjs.map

Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.

{"version":3,"file":"Canvas2dFilterBackend.mjs","names":[],"sources":["../../../src/filters/Canvas2dFilterBackend.ts"],"sourcesContent":["/**\n * Canvas 2D filter backend.\n */\nimport type { BaseFilter } from './BaseFilter';\nimport type { T2DPipelineState, TPipelineResources } from './typedefs';\n\nexport class Canvas2dFilterBackend {\n  /**\n   * Experimental. This object is a sort of repository of help layers used to avoid\n   * of recreating them during frequent filtering. If you are previewing a filter with\n   * a slider you probably do not want to create help layers every filter step.\n   * in this object there will be appended some canvases, created once, resized sometimes\n   * cleared never. Clearing is left to the developer.\n   **/\n  resources: TPipelineResources = {};\n\n  /**\n   * Apply a set of filters against a source image and draw the filtered output\n   * to the provided destination canvas.\n   *\n   * @param {EnhancedFilter} filters The filter to apply.\n   * @param {HTMLImageElement|HTMLCanvasElement} sourceElement The source to be filtered.\n   * @param {Number} sourceWidth The width of the source input.\n   * @param {Number} sourceHeight The height of the source input.\n   * @param {HTMLCanvasElement} targetCanvas The destination for filtered output to be drawn.\n   */\n  applyFilters(\n    filters: BaseFilter<string>[],\n    sourceElement: CanvasImageSource,\n    sourceWidth: number,\n    sourceHeight: number,\n    targetCanvas: HTMLCanvasElement,\n  ): T2DPipelineState | void {\n    const ctx = targetCanvas.getContext('2d', {\n      willReadFrequently: true,\n      desynchronized: true,\n    });\n    if (!ctx) {\n      return;\n    }\n    ctx.drawImage(sourceElement, 0, 0, sourceWidth, sourceHeight);\n    const imageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight);\n    const originalImageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight);\n    const pipelineState: T2DPipelineState = {\n      sourceWidth,\n      sourceHeight,\n      imageData,\n      originalEl: sourceElement,\n      originalImageData,\n      canvasEl: targetCanvas,\n      ctx,\n      filterBackend: this,\n    };\n    filters.forEach((filter) => {\n      filter.applyTo(pipelineState);\n    });\n    const { imageData: imageDataPostFilter } = pipelineState;\n    if (\n      imageDataPostFilter.width !== sourceWidth ||\n      imageDataPostFilter.height !== sourceHeight\n    ) {\n      targetCanvas.width = imageDataPostFilter.width;\n      targetCanvas.height = imageDataPostFilter.height;\n    }\n    ctx.putImageData(imageDataPostFilter, 0, 0);\n    return pipelineState;\n  }\n}\n"],"mappings":";;AAMA,IAAa,wBAAb,MAAmC;;;;;;;;;;;GAQjC;GAAgC,EAAE;GAAC;;;;;;;;;;;;CAYnC,aACE,SACA,eACA,aACA,cACA,cACyB;EACzB,MAAM,MAAM,aAAa,WAAW,MAAM;GACxC,oBAAoB;GACpB,gBAAgB;GACjB,CAAC;AACF,MAAI,CAAC,IACH;AAEF,MAAI,UAAU,eAAe,GAAG,GAAG,aAAa,aAAa;EAG7D,MAAM,gBAAkC;GACtC;GACA;GACA,WALgB,IAAI,aAAa,GAAG,GAAG,aAAa,aAAa;GAMjE,YAAY;GACZ,mBANwB,IAAI,aAAa,GAAG,GAAG,aAAa,aAAa;GAOzE,UAAU;GACV;GACA,eAAe;GAChB;AACD,UAAQ,SAAS,WAAW;AAC1B,UAAO,QAAQ,cAAc;IAC7B;EACF,MAAM,EAAE,WAAW,wBAAwB;AAC3C,MACE,oBAAoB,UAAU,eAC9B,oBAAoB,WAAW,cAC/B;AACA,gBAAa,QAAQ,oBAAoB;AACzC,gBAAa,SAAS,oBAAoB;;AAE5C,MAAI,aAAa,qBAAqB,GAAG,EAAE;AAC3C,SAAO"}