fabric/dist/src/filters/Invert.mjs

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

import { _defineProperty } from "../../_virtual/_@oxc-project_runtime@0.122.0/helpers/defineProperty.mjs";
import { classRegistry } from "../ClassRegistry.mjs";
import { BaseFilter } from "./BaseFilter.mjs";
import { fragmentSource } from "./shaders/invert.mjs";
//#region src/filters/Invert.ts
const invertDefaultValues = {
	alpha: false,
	invert: true
};
/**
* @example
* const filter = new Invert();
* object.filters.push(filter);
* object.applyFilters(canvas.renderAll.bind(canvas));
*/
var Invert = class extends BaseFilter {
	/**
	* Apply the Invert operation to a Uint8Array representing the pixels of an image.
	*
	* @param {Object} options
	* @param {ImageData} options.imageData The Uint8Array to be filtered.
	*/
	applyTo2d({ imageData: { data } }) {
		for (let i = 0; i < data.length; i += 4) {
			data[i] = 255 - data[i];
			data[i + 1] = 255 - data[i + 1];
			data[i + 2] = 255 - data[i + 2];
			if (this.alpha) data[i + 3] = 255 - data[i + 3];
		}
	}
	getFragmentSource() {
		return fragmentSource;
	}
	/**
	* Invert filter isNeutralState implementation
	* Used only in image applyFilters to discard filters that will not have an effect
	* on the image
	* @param {Object} options
	**/
	isNeutralState() {
		return !this.invert;
	}
	/**
	* Send data from this filter to its shader program's uniforms.
	*
	* @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.
	* @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects
	*/
	sendUniformData(gl, uniformLocations) {
		gl.uniform1i(uniformLocations.uInvert, Number(this.invert));
		gl.uniform1i(uniformLocations.uAlpha, Number(this.alpha));
	}
};
_defineProperty(Invert, "type", "Invert");
_defineProperty(Invert, "defaults", invertDefaultValues);
_defineProperty(Invert, "uniformLocations", ["uInvert", "uAlpha"]);
classRegistry.setClass(Invert);
//#endregion
export { Invert };

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