fabric/dist/src/util/misc/isTransparent.mjs.map

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

{"version":3,"file":"isTransparent.mjs","names":[],"sources":["../../../../src/util/misc/isTransparent.ts"],"sourcesContent":["/**\n * Returns true if context has transparent pixel\n * at specified location (taking tolerance into account)\n * @param {CanvasRenderingContext2D} ctx context\n * @param {Number} x x coordinate in canvasElementCoordinate, not fabric space. integer\n * @param {Number} y y coordinate in canvasElementCoordinate, not fabric space. integer\n * @param {Number} tolerance Tolerance pixels around the point, not alpha tolerance, integer\n * @return {boolean} true if transparent\n */\nexport const isTransparent = (\n  ctx: CanvasRenderingContext2D,\n  x: number,\n  y: number,\n  tolerance: number,\n): boolean => {\n  tolerance = Math.round(tolerance);\n  const size = tolerance * 2 + 1;\n  const { data } = ctx.getImageData(x - tolerance, y - tolerance, size, size);\n\n  // Split image data - for tolerance > 1, pixelDataSize = 4;\n  for (let i = 3; i < data.length; i += 4) {\n    const alphaChannel = data[i];\n    if (alphaChannel > 0) {\n      return false;\n    }\n  }\n  return true;\n};\n"],"mappings":";;;;;;;;;;AASA,MAAa,iBACX,KACA,GACA,GACA,cACY;AACZ,aAAY,KAAK,MAAM,UAAU;CACjC,MAAM,OAAO,YAAY,IAAI;CAC7B,MAAM,EAAE,SAAS,IAAI,aAAa,IAAI,WAAW,IAAI,WAAW,MAAM,KAAK;AAG3E,MAAK,IAAI,IAAI,GAAG,IAAI,KAAK,QAAQ,KAAK,EAEpC,KADqB,KAAK,KACP,EACjB,QAAO;AAGX,QAAO"}