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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
* http://paperjs.org/
*
* Copyright (c) 2011 - 2020, Jürg Lehni & Jonathan Puckey
* http://juerglehni.com/ & https://puckey.studio/
*
* Distributed under the MIT license. See LICENSE file for details.
*
* All rights reserved.
*/
// TODO: remove eslint-disable comment and deal with errors over time
/* eslint-disable */
import { ref } from '~/globals';
import { Base } from '~/straps';
import { Matrix } from '~/basic/Matrix';
import { Point } from '~/basic/Point';
import { Rectangle } from '~/basic/Rectangle';
import { Numerical } from '~/util/Numerical';
import { Change } from '~/item/ChangeFlag';
import { LinkedSize, Size } from '~/basic/Size';
import { Item } from './Item';
/**
* @name Raster
*
* @class The Raster item represents an image in a Paper.js project.
*
* @extends Item
*/
export const Raster = Item.extend(
/** @lends Raster# */ {
_class: 'Raster',
_applyMatrix: false,
_canApplyMatrix: false,
// Raster doesn't make the distinction between the different bounds,
// so use the same name for all of them
_boundsOptions: { stroke: false, handle: false },
_serializeFields: {
crossOrigin: null, // NOTE: Needs to be set before source to work!
source: null,
},
// Prioritize `crossOrigin` over `source`:
_prioritize: ['crossOrigin'],
_smoothing: 'low',
// Enforce creation of beans, as bean getters have hidden parameters.
// See #getContext(_change) below.
beans: true,
// TODO: Implement type, width, height.
// TODO: Have SymbolItem & Raster inherit from a shared class?
/**
* Creates a new raster item from the passed argument, and places it in the
* active layer. `source` can either be a DOM Image, a Canvas, or a string
* describing the URL to load the image from, or the ID of a DOM element to
* get the image from (either a DOM Image or a Canvas).
*
* @name Raster#initialize
* @param {HTMLImageElement|HTMLCanvasElement|String} [source] the source of
* the raster
* @param {Point} [position] the center position at which the raster item is
* placed
*
* @example {@paperscript height=300} // Creating a raster using a url
* var url = 'http://assets.paperjs.org/images/marilyn.jpg';
* var raster = new Raster(url);
*
* // If you create a Raster using a url, you can use the onLoad
* // handler to do something once it is loaded:
* raster.onLoad = function() {
* console.log('The image has loaded.');
* };
*
* @example // Creating a raster using the id of a DOM Image:
*
* // Create a raster using the id of the image:
* var raster = new Raster('art');
*
* @example // Creating a raster using a DOM Image:
*
* // Find the element using its id:
* var imageElement = document.getElementById('art');
*
* // Create the raster:
* var raster = new Raster(imageElement);
*/
/**
* Creates a new empty raster of the given size, and places it in the
* active layer.
*
* @name Raster#initialize
* @param {Size} size the size of the raster
* @param {Point} [position] the center position at which the raster item is
* placed
*
* @example {@paperscript height=150}
* // Creating an empty raster and fill it with random pixels:
* var width = 100;
* var height = 100;
*
* // Create an empty raster placed at view center.
* var raster = new Raster(new Size(width, height), view.center);
*
* // For all of its pixels...
* for (var i = 0; i < width; i++) {
* for (var j = 0; j < height; j++) {
* // ...set a random color.
* raster.setPixel(i, j, Color.random());
* }
* }
*/
/**
* Creates a new raster from an object description, and places it in the
* active layer.
*
* @name Raster#initialize
* @param {Object} object an object containing properties to be set on the
* raster
*
* @example {@paperscript height=300}
* var raster = new Raster({
* source: 'http://assets.paperjs.org/images/marilyn.jpg',
* position: view.center
* });
*
* raster.scale(0.5);
* raster.rotate(10);
*/
initialize: function Raster(source, position) {
// Support three forms of item initialization:
// - One object literal describing all the different properties.
// - An image (Image|Canvas|String) and an optional position (Point).
// - A size (Size) describing the canvas that will be created and an
// optional position (Point).
// If _initialize can set properties through object literal, we're done.
// Otherwise we need to check the type of object:
if (!this._initialize(source, position !== undefined && Point.read(arguments))) {
var image,
type = typeof source,
object = type === 'string' ? globalThis.document.getElementById(source) : type === 'object' ? source : null;
if (object && object !== Item.NO_INSERT) {
if (object.getContext || object.naturalHeight != null) {
image = object;
} else if (object) {
// See if the arguments describe the raster size:
var size = Size.read(arguments);
if (!size.isZero()) {
// @ts-expect-error = Expected 3 arguments, but got 1
image = ref.CanvasProvider.getCanvas(size);
}
}
}
if (image) {
// #setImage() handles both canvas and image types.
this.setImage(image);
} else {
this.setSource(source);
}
}
if (!this._size) {
this._size = new Size();
this._loaded = false;
}
},
_equals: function (item) {
return this.getSource() === item.getSource();
},
copyContent: function (source) {
var image = source._image,
canvas = source._canvas;
if (image) {
this._setImage(image);
} else if (canvas) {
// If the Raster contains a Canvas object, we need to create a new
// one and draw this raster's canvas on it.
// @ts-expect-error = Expected 3 arguments, but got 1
var copyCanvas = ref.CanvasProvider.getCanvas(source._size);
copyCanvas.getContext('2d').drawImage(canvas, 0, 0);
this._setImage(copyCanvas);
}
// TODO: Shouldn't this be copied with attributes instead of content?
this._crossOrigin = source._crossOrigin;
},
/**
* The size of the raster in pixels.
*
* @bean
* @type Size
*/
getSize: function () {
var size = this._size;
return new LinkedSize(size ? size.width : 0, size ? size.height : 0, this, 'setSize');
},
setSize: function (_size, _clear) {
var size = Size.read(arguments);
if (!size.equals(this._size)) {
// NOTE: this._size could be null
if (size.width > 0 && size.height > 0) {
// Get reference to image before changing canvas.
var element = !_clear && this.getElement();
// NOTE: Setting canvas internally sets _size.
// NOTE: No need to release canvas because #_setImage() does so.
// @ts-expect-error = Expected 3 arguments, but got 1
this._setImage(ref.CanvasProvider.getCanvas(size));
if (element) {
// Draw element back onto the new, resized canvas.
this.getContext(true).drawImage(element, 0, 0, size.width, size.height);
}
} else {
// 0-width / height dimensions do not require the creation of
// an internal canvas. Just reflect the size for now.
if (this._canvas) ref.CanvasProvider.release(this._canvas);
this._size = size.clone();
}
} else if (_clear) {
// We can reuse the canvas, but need to clear it.
this.clear();
}
},
/**
* The width of the raster in pixels.
*
* @bean
* @type Number
*/
getWidth: function () {
return this._size ? this._size.width : 0;
},
setWidth: function (width) {
this.setSize(width, this.getHeight());
},
/**
* The height of the raster in pixels.
*
* @bean
* @type Number
*/
getHeight: function () {
return this._size ? this._size.height : 0;
},
setHeight: function (height) {
this.setSize(this.getWidth(), height);
},
/**
* The loading state of the raster image.
*
* @bean
* @type Boolean
*/
getLoaded: function () {
return this._loaded;
},
isEmpty: function () {
var size = this._size;
return !size || (size.width === 0 && size.height === 0);
},
/**
* The resolution of the raster at its current size, in PPI (pixels per
* inch).
*
* @bean
* @type Size
*/
getResolution: function () {
var matrix = this._matrix,
orig = new Point(0, 0).transform(matrix),
u = new Point(1, 0).transform(matrix).subtract(orig),
v = new Point(0, 1).transform(matrix).subtract(orig);
return new Size(72 / u.getLength(), 72 / v.getLength());
},
/**
* @private
* @bean
* @deprecated use {@link #resolution} instead.
*/
getPpi: '#getResolution',
/**
* The HTMLImageElement or Canvas element of the raster, if one is
* associated.
* Note that for consistency, a {@link #onLoad} event will be triggered on
* the raster even if the image has already finished loading before, or if
* we are setting the raster to a canvas.
*
* @bean
* @type HTMLImageElement|HTMLCanvasElement
*/
getImage: function () {
return this._image;
},
setImage: function (image) {
var that = this;
function emit(event) {
var view = that.getView(),
type = (event && event.type) || 'load';
if (view && that.responds(type)) {
ref.paper = view._scope;
that.emit(type, new ref.Event(event));
}
}
this._setImage(image);
if (this._loaded) {
// Emit load event with a delay, so behavior is the same as when
// it's actually loaded and we give the code time to install event.
setTimeout(emit, 0);
} else if (image) {
// Trigger the load event on the image once it's loaded
ref.DomEvent.add(image, {
load: function (event) {
that._setImage(image);
emit(event);
},
error: emit,
});
}
},
/**
* Internal version of {@link #setImage(image)} that does not trigger
* events. This is used by #setImage(), but also in other places where
* underlying canvases are replaced, resized, etc.
*/
_setImage: function (image) {
if (this._canvas) ref.CanvasProvider.release(this._canvas);
// Due to similarities, we can handle both canvas and image types here.
if (image && image.getContext) {
// A Canvas object
this._image = null;
this._canvas = image;
this._loaded = true;
} else {
// A Image object
this._image = image;
this._canvas = null;
this._loaded = !!(image && image.src && image.complete);
}
// Both canvas and image have width / height attributes. Due to IE,
// naturalWidth / Height needs to be checked for a swell, because it
// apparently can have width / height set to 0 when the image is
// invisible in the document.
this._size = new Size(
image ? image.naturalWidth || image.width : 0,
image ? image.naturalHeight || image.height : 0
);
this._context = null;
this._changed(/*#=*/ Change.GEOMETRY | Change.PIXELS);
},
/**
* The Canvas object of the raster. If the raster was created from an image,
* accessing its canvas causes the raster to try and create one and draw the
* image into it. Depending on security policies, this might fail, in which
* case `null` is returned instead.
*
* @bean
* @type HTMLCanvasElement
*/
getCanvas: function () {
if (!this._canvas) {
// @ts-expect-error = Expected 3 arguments, but got 1
var ctx = ref.CanvasProvider.getContext(this._size);
// Since drawImage into canvas might fail based on security policies
// wrap the call in try-catch and only set _canvas if we succeeded.
try {
if (this._image) ctx.drawImage(this._image, 0, 0);
this._canvas = ctx.canvas;
} catch (e) {
ref.CanvasProvider.release(ctx);
}
}
return this._canvas;
},
// #setCanvas() is a simple alias to #setImage()
setCanvas: '#setImage',
/**
* The Canvas 2D drawing context of the raster.
*
* @bean
* @type CanvasRenderingContext2D
*/
getContext: function (_change) {
if (!this._context) this._context = this.getCanvas().getContext('2d');
// Support a hidden parameter that indicates if the context will be used
// to change the Raster object. We can notify such changes ahead since
// they are only used afterwards for redrawing.
if (_change) {
// Also set _image to null since the Raster stops representing it.
// NOTE: This should theoretically be in our own _changed() handler
// for ChangeFlag.PIXELS, but since it's only happening in one place
// this is fine:
this._image = null;
this._changed(/*#=*/ Change.PIXELS);
}
return this._context;
},
setContext: function (context) {
this._context = context;
},
/**
* The source of the raster, which can be set using a DOM Image, a Canvas,
* a data url, a string describing the URL to load the image from, or the
* ID of a DOM element to get the image from (either a DOM Image or a
* Canvas). Reading this property will return the url of the source image or
* a data-url.
* Note that for consistency, a {@link #onLoad} event will be triggered on
* the raster even if the image has already finished loading before.
*
* @bean
* @type HTMLImageElement|HTMLCanvasElement|String
*
* @example {@paperscript}
* var raster = new Raster();
* raster.source = 'http://paperjs.org/about/paper-js.gif';
* raster.position = view.center;
*
* @example {@paperscript}
* var raster = new Raster({
* source: 'http://paperjs.org/about/paper-js.gif',
* position: view.center
* });
*/
getSource: function () {
var image = this._image;
return (image && image.src) || this.toDataURL();
},
setSource: function (src) {
var image = new globalThis.Image(),
crossOrigin = this._crossOrigin;
if (crossOrigin) image.crossOrigin = crossOrigin;
// Prevent setting image source to `null`, as this isn't supported by
// browsers, and it would actually throw exceptions in JSDOM.
// TODO: Look into fixing this bug in JSDOM.
if (src) image.src = src;
this.setImage(image);
},
/**
* The crossOrigin value to be used when loading the image resource, in
* order to support CORS. Note that this needs to be set before setting the
* {@link #source} property in order to always work (e.g. when the image is
* cached in the browser).
*
* @bean
* @type String
*
* @example {@paperscript}
* var raster = new Raster({
* crossOrigin: 'anonymous',
* source: 'http://assets.paperjs.org/images/marilyn.jpg',
* position: view.center
* });
*
* console.log(view.element.toDataURL('image/png').substring(0, 32));
*/
getCrossOrigin: function () {
var image = this._image;
return (image && image.crossOrigin) || this._crossOrigin || '';
},
setCrossOrigin: function (crossOrigin) {
this._crossOrigin = crossOrigin;
var image = this._image;
if (image) image.crossOrigin = crossOrigin;
},
/**
* Determines if the raster is drawn with pixel smoothing when scaled up or
* down, and if so, at which quality its pixels are to be smoothed. The
* settings of this property control both the `imageSmoothingEnabled` and
* `imageSmoothingQuality` properties of the `CanvasRenderingContext2D`
* interface.
*
* By default, smoothing is enabled at `'low'` quality. It can be set to of
* `'off'` to scale the raster's pixels by repeating the nearest neighboring
* pixels, or to `'low'`, `'medium'` or `'high'` to control the various
* degrees of available image smoothing quality.
*
* For backward compatibility, it can can also be set to `false` (= `'off'`)
* or `true` (= `'low'`).
*
* @bean
* @type String
* @default 'low'
* @values 'low', 'medium', 'high', 'off'
*
* @example {@paperscript} var raster = new Raster({source:
* 'http://assets.paperjs.org/images/marilyn.jpg', smoothing: 'off'
* });
* raster.scale(5);
*/
getSmoothing: function () {
return this._smoothing;
},
setSmoothing: function (smoothing) {
this._smoothing = typeof smoothing === 'string' ? smoothing : smoothing ? 'low' : 'off';
this._changed(/*#=*/ Change.ATTRIBUTE);
},
// DOCS: document Raster#getElement
getElement: function () {
// Only return the internal element if the content is actually ready.
return this._canvas || (this._loaded && this._image);
},
},
/** @lends Raster# */ {
// Explicitly deactivate the creation of beans, as we have functions here
// that look like bean getters but actually read arguments.
// See #getSubCanvas(), #getSubRaster(), #getSubRaster(), #getPixel(),
// #getImageData()
beans: false,
/**
* Extracts a part of the Raster's content as a sub image, and returns it as
* a Canvas object.
*
* @param {Rectangle} rect the boundaries of the sub image in pixel
* coordinates
*
* @return {HTMLCanvasElement} the sub image as a Canvas object
*/
getSubCanvas: function (/* rect */) {
var rect = Rectangle.read(arguments),
// @ts-expect-error = Expected 3 arguments, but got 1
ctx = ref.CanvasProvider.getContext(rect.getSize());
ctx.drawImage(this.getCanvas(), rect.x, rect.y, rect.width, rect.height, 0, 0, rect.width, rect.height);
return ctx.canvas;
},
/**
* Extracts a part of the raster item's content as a new raster item, placed
* in exactly the same place as the original content.
*
* @param {Rectangle} rect the boundaries of the sub raster in pixel
* coordinates
*
* @return {Raster} the sub raster as a newly created raster item
*/
getSubRaster: function (/* rect */) {
var rect = Rectangle.read(arguments),
raster = new Raster(Item.NO_INSERT);
raster._setImage(this.getSubCanvas(rect));
raster.translate(rect.getCenter().subtract(this.getSize().divide(2)));
raster._matrix.prepend(this._matrix);
raster.insertAbove(this);
return raster;
},
/**
* Returns a Base 64 encoded `data:` URL representation of the raster.
*
* @return {String}
*/
toDataURL: function () {
// See if the linked image is base64 encoded already, if so reuse it,
// otherwise try using canvas.toDataURL()
var image = this._image,
src = image && image.src;
if (/^data:/.test(src)) return src;
var canvas = this.getCanvas();
return canvas ? canvas.toDataURL.apply(canvas, arguments) : null;
},
/**
* Draws an image on the raster.
*
* @param {CanvasImageSource} image
* @param {Point} point the offset of the image as a point in pixel
* coordinates
*/
drawImage: function (image /*, point */) {
var point = Point.read(arguments, 1);
this.getContext(true).drawImage(image, point.x, point.y);
},
/**
* Calculates the average color of the image within the given path,
* rectangle or point. This can be used for creating raster image
* effects.
*
* @param {Path|Rectangle|Point} object
* @return {Color} the average color contained in the area covered by the
* specified path, rectangle or point
*/
getAverageColor: function (object) {
var bounds, path;
if (!object) {
bounds = this.getBounds();
} else if (object instanceof ref.PathItem) {
// TODO: What if the path is smaller than 1 px?
// TODO: How about rounding of bounds.size?
path = object;
bounds = object.getBounds();
} else if (typeof object === 'object') {
if ('width' in object) {
bounds = new Rectangle(object);
} else if ('x' in object) {
// Create a rectangle of 1px size around the specified point.
bounds = new Rectangle(object.x - 0.5, object.y - 0.5, 1, 1);
}
}
if (!bounds) return null;
// Use a sample size of max 32 x 32 pixels, into which the path is
// scaled as a clipping path, and then the actual image is drawn in and
// sampled.
var sampleSize = 32,
width = Math.min(bounds.width, sampleSize),
height = Math.min(bounds.height, sampleSize);
// Reuse the same sample context for speed. Memory consumption is low
// since it's only 32 x 32 pixels.
var ctx = Raster._sampleContext;
if (!ctx) {
// @ts-expect-error = Expected 3 arguments, but got 1
ctx = Raster._sampleContext = ref.CanvasProvider.getContext(new Size(sampleSize));
} else {
// Clear the sample canvas:
ctx.clearRect(0, 0, sampleSize + 1, sampleSize + 1);
}
ctx.save();
// Scale the context so that the bounds ends up at the given sample size
var matrix = new Matrix().scale(width / bounds.width, height / bounds.height).translate(-bounds.x, -bounds.y);
matrix.applyToContext(ctx);
// If a path was passed, draw it as a clipping mask:
// See Project#draw() for an explanation of new Base()
if (path) path.draw(ctx, new Base({ clip: true, matrices: [matrix] }));
// Now draw the image clipped into it.
this._matrix.applyToContext(ctx);
var element = this.getElement(),
size = this._size;
if (element) ctx.drawImage(element, -size.width / 2, -size.height / 2);
ctx.restore();
// Get pixel data from the context and calculate the average color value
// from it, taking alpha into account.
var pixels = ctx.getImageData(0.5, 0.5, Math.ceil(width), Math.ceil(height)).data,
channels = [0, 0, 0],
total = 0;
for (var i = 0, l = pixels.length; i < l; i += 4) {
var alpha = pixels[i + 3];
total += alpha;
alpha /= 255;
channels[0] += pixels[i] * alpha;
channels[1] += pixels[i + 1] * alpha;
channels[2] += pixels[i + 2] * alpha;
}
for (var i = 0; i < 3; i++) channels[i] /= total;
return total ? ref.Color.read(channels) : null;
},
/**
* {@grouptitle Pixels}
* Gets the color of a pixel in the raster.
*
* @name Raster#getPixel
* @function
* @param {Number} x the x offset of the pixel in pixel coordinates
* @param {Number} y the y offset of the pixel in pixel coordinates
* @return {Color} the color of the pixel
*/
/**
* Gets the color of a pixel in the raster.
*
* @name Raster#getPixel
* @function
* @param {Point} point the offset of the pixel as a point in pixel
* coordinates
* @return {Color} the color of the pixel
*/
getPixel: function (/* point */) {
var point = Point.read(arguments);
var data = this.getContext().getImageData(point.x, point.y, 1, 1).data;
// Alpha is separate now:
return new ref.Color('rgb', [data[0] / 255, data[1] / 255, data[2] / 255], data[3] / 255);
},
/**
* Sets the color of the specified pixel to the specified color.
*
* @name Raster#setPixel
* @function
* @param {Number} x the x offset of the pixel in pixel coordinates
* @param {Number} y the y offset of the pixel in pixel coordinates
* @param {Color} color the color that the pixel will be set to
*/
/**
* Sets the color of the specified pixel to the specified color.
*
* @name Raster#setPixel
* @function
* @param {Point} point the offset of the pixel as a point in pixel
* coordinates
* @param {Color} color the color that the pixel will be set to
*/
setPixel: function (/* point, color */) {
var args = arguments,
point = Point.read(args),
color = ref.Color.read(args),
components = color._convert('rgb'),
alpha = color._alpha,
ctx = this.getContext(true),
imageData = ctx.createImageData(1, 1),
data = imageData.data;
data[0] = components[0] * 255;
data[1] = components[1] * 255;
data[2] = components[2] * 255;
data[3] = alpha != null ? alpha * 255 : 255;
ctx.putImageData(imageData, point.x, point.y);
},
/**
* Clears the image, if it is backed by a canvas.
*/
clear: function () {
var size = this._size;
this.getContext(true).clearRect(0, 0, size.width + 1, size.height + 1);
},
// DOCS: document Raster#createImageData
/**
* {@grouptitle Image Data}
* @param {Size} size
* @return {ImageData}
*/
createImageData: function (/* size */) {
var size = Size.read(arguments);
return this.getContext().createImageData(size.width, size.height);
},
// DOCS: document Raster#getImageData
/**
* @param {Rectangle} rect
* @return {ImageData}
*/
getImageData: function (/* rect */) {
var rect = Rectangle.read(arguments);
if (rect.isEmpty()) rect = new Rectangle(this._size);
return this.getContext().getImageData(rect.x, rect.y, rect.width, rect.height);
},
// DOCS: document Raster#putImageData
/**
* @param {ImageData} data
* @param {Point} point
*/
putImageData: function (data /*, point */) {
var point = Point.read(arguments, 1);
this.getContext(true).putImageData(data, point.x, point.y);
},
// DOCS: document Raster#setImageData
/**
* @param {ImageData} data
*/
setImageData: function (data) {
this.setSize(data);
this.getContext(true).putImageData(data, 0, 0);
},
/**
* {@grouptitle Event Handlers}
*
* The event handler function to be called when the underlying image has
* finished loading and is ready to be used. This is also triggered when
* the image is already loaded, or when a canvas is used instead of an
* image.
*
* @name Raster#onLoad
* @property
* @type ?Function
*
* @example
* var url = 'http://assets.paperjs.org/images/marilyn.jpg';
* var raster = new Raster(url);
*
* // If you create a Raster using a url, you can use the onLoad
* // handler to do something once it is loaded:
* raster.onLoad = function() {
* console.log('The image has finished loading.');
* };
*
* // As with all events in paper.js, you can also use this notation instead
* // to install multiple handlers:
* raster.on('load', function() {
* console.log('Now the image is definitely ready.');
* });
*/
/**
*
* The event handler function to be called when there is an error loading
* the underlying image.
*
* @name Raster#onError
* @property
* @type ?Function
*/
_getBounds: function (matrix, options) {
var rect = new Rectangle(this._size).setCenter(0, 0);
return matrix ? matrix._transformBounds(rect) : rect;
},
_hitTestSelf: function (point) {
if (this._contains(point)) {
var that = this;
return new ref.HitResult('pixel', that, {
offset: point.add(that._size.divide(2)).round(),
// Inject as Straps.js accessor, so #toString renders well too
color: {
get: function () {
return that.getPixel(this.offset);
},
},
});
}
},
_draw: function (ctx, param, viewMatrix) {
var element = this.getElement();
// Only draw if image is not empty (#1320).
if (element && element.width > 0 && element.height > 0) {
// Handle opacity for Rasters separately from the rest, since
// Rasters never draw a stroke. See Item#draw().
ctx.globalAlpha = Numerical.clamp(this._opacity, 0, 1);
// Call _setStyles() to make sure shadow is drawn (#1437).
this._setStyles(ctx, param, viewMatrix);
// `Raster#smoothing` controlls both the `imageSmoothingQuality`
// and `imageSmoothingEnabled` canvas context properties:
var smoothing = this._smoothing,
disabled = smoothing === 'off';
ref.DomElement.setPrefixed(
ctx,
disabled ? 'imageSmoothingEnabled' : 'imageSmoothingQuality',
disabled ? false : smoothing
);
ctx.drawImage(element, -this._size.width / 2, -this._size.height / 2);
}
},
_canComposite: function () {
return true;
},
}
);
ref.Raster = Raster;
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