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feat(fabric.filters) Added vibrance filter (for increasing saturation…
… of muted colors) (#7189)
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(function(global) { | ||
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'use strict'; | ||
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var fabric = global.fabric || (global.fabric = { }), | ||
filters = fabric.Image.filters, | ||
createClass = fabric.util.createClass; | ||
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/** | ||
* Vibrance filter class | ||
* @class fabric.Image.filters.Vibrance | ||
* @memberOf fabric.Image.filters | ||
* @extends fabric.Image.filters.BaseFilter | ||
* @see {@link fabric.Image.filters.Vibrance#initialize} for constructor definition | ||
* @see {@link http://fabricjs.com/image-filters|ImageFilters demo} | ||
* @example | ||
* var filter = new fabric.Image.filters.Vibrance({ | ||
* vibrance: 1 | ||
* }); | ||
* object.filters.push(filter); | ||
* object.applyFilters(); | ||
*/ | ||
filters.Vibrance = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Vibrance.prototype */ { | ||
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/** | ||
* Filter type | ||
* @param {String} type | ||
* @default | ||
*/ | ||
type: 'Vibrance', | ||
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fragmentSource: 'precision highp float;\n' + | ||
'uniform sampler2D uTexture;\n' + | ||
'uniform float uVibrance;\n' + | ||
'varying vec2 vTexCoord;\n' + | ||
'void main() {\n' + | ||
'vec4 color = texture2D(uTexture, vTexCoord);\n' + | ||
'float max = max(color.r, max(color.g, color.b));\n' + | ||
'float avg = (color.r + color.g + color.b) / 3.0;\n' + | ||
'float amt = (abs(max - avg) * 2.0) * uVibrance;\n' + | ||
'color.r += max != color.r ? (max - color.r) * amt : 0.00;\n' + | ||
'color.g += max != color.g ? (max - color.g) * amt : 0.00;\n' + | ||
'color.b += max != color.b ? (max - color.b) * amt : 0.00;\n' + | ||
'gl_FragColor = color;\n' + | ||
'}', | ||
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/** | ||
* Vibrance value, from -1 to 1. | ||
* Increases/decreases the saturation of more muted colors with less effect on saturated colors. | ||
* A value of 0 has no effect. | ||
* | ||
* @param {Number} vibrance | ||
* @default | ||
*/ | ||
vibrance: 0, | ||
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mainParameter: 'vibrance', | ||
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/** | ||
* Constructor | ||
* @memberOf fabric.Image.filters.Vibrance.prototype | ||
* @param {Object} [options] Options object | ||
* @param {Number} [options.vibrance=0] Vibrance value for the image (between -1 and 1) | ||
*/ | ||
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/** | ||
* Apply the Vibrance operation to a Uint8ClampedArray representing the pixels of an image. | ||
* | ||
* @param {Object} options | ||
* @param {ImageData} options.imageData The Uint8ClampedArray to be filtered. | ||
*/ | ||
applyTo2d: function(options) { | ||
if (this.vibrance === 0) { | ||
return; | ||
} | ||
var imageData = options.imageData, | ||
data = imageData.data, len = data.length, | ||
adjust = -this.vibrance, i, max, avg, amt; | ||
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for (i = 0; i < len; i += 4) { | ||
max = Math.max(data[i], data[i + 1], data[i + 2]); | ||
avg = (data[i] + data[i + 1] + data[i + 2]) / 3; | ||
amt = ((Math.abs(max - avg) * 2 / 255) * adjust); | ||
data[i] += max !== data[i] ? (max - data[i]) * amt : 0; | ||
data[i + 1] += max !== data[i + 1] ? (max - data[i + 1]) * amt : 0; | ||
data[i + 2] += max !== data[i + 2] ? (max - data[i + 2]) * amt : 0; | ||
} | ||
}, | ||
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/** | ||
* Return WebGL uniform locations for this filter's shader. | ||
* | ||
* @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader. | ||
* @param {WebGLShaderProgram} program This filter's compiled shader program. | ||
*/ | ||
getUniformLocations: function(gl, program) { | ||
return { | ||
uVibrance: gl.getUniformLocation(program, 'uVibrance'), | ||
}; | ||
}, | ||
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/** | ||
* 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: function(gl, uniformLocations) { | ||
gl.uniform1f(uniformLocations.uVibrance, -this.vibrance); | ||
}, | ||
}); | ||
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/** | ||
* Returns filter instance from an object representation | ||
* @static | ||
* @param {Object} object Object to create an instance from | ||
* @param {Function} [callback] to be invoked after filter creation | ||
* @return {fabric.Image.filters.Vibrance} Instance of fabric.Image.filters.Vibrance | ||
*/ | ||
fabric.Image.filters.Vibrance.fromObject = fabric.Image.filters.BaseFilter.fromObject; | ||
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})(typeof exports !== 'undefined' ? exports : this); |