765 lines
32 KiB
TypeScript
765 lines
32 KiB
TypeScript
import {ElementPaint, parseStackingContexts, StackingContext} from '../stacking-context';
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import {asString, Color, isTransparent} from '../../css/types/color';
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import {Logger} from '../../core/logger';
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import {ElementContainer} from '../../dom/element-container';
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import {BORDER_STYLE} from '../../css/property-descriptors/border-style';
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import {CSSParsedDeclaration} from '../../css/index';
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import {TextContainer} from '../../dom/text-container';
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import {Path, transformPath} from '../path';
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import {BACKGROUND_CLIP} from '../../css/property-descriptors/background-clip';
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import {BoundCurves, calculateBorderBoxPath, calculateContentBoxPath, calculatePaddingBoxPath} from '../bound-curves';
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import {isBezierCurve} from '../bezier-curve';
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import {Vector} from '../vector';
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import {CSSImageType, CSSURLImage, isLinearGradient, isRadialGradient} from '../../css/types/image';
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import {parsePathForBorder} from '../border';
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import {Cache} from '../../core/cache-storage';
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import {calculateBackgroundRendering, getBackgroundValueForIndex} from '../background';
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import {isDimensionToken} from '../../css/syntax/parser';
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import {TextBounds} from '../../css/layout/text';
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import {fromCodePoint, toCodePoints} from 'css-line-break';
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import {ImageElementContainer} from '../../dom/replaced-elements/image-element-container';
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import {contentBox} from '../box-sizing';
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import {CanvasElementContainer} from '../../dom/replaced-elements/canvas-element-container';
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import {SVGElementContainer} from '../../dom/replaced-elements/svg-element-container';
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import {ReplacedElementContainer} from '../../dom/replaced-elements/index';
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import {EffectTarget, IElementEffect, isClipEffect, isTransformEffect} from '../effects';
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import {contains} from '../../core/bitwise';
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import {calculateGradientDirection, calculateRadius, processColorStops} from '../../css/types/functions/gradient';
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import {FIFTY_PERCENT, getAbsoluteValue} from '../../css/types/length-percentage';
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import {TEXT_DECORATION_LINE} from '../../css/property-descriptors/text-decoration-line';
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import {FontMetrics} from '../font-metrics';
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import {DISPLAY} from '../../css/property-descriptors/display';
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import {Bounds} from '../../css/layout/bounds';
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import {LIST_STYLE_TYPE} from '../../css/property-descriptors/list-style-type';
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import {computeLineHeight} from '../../css/property-descriptors/line-height';
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import {CHECKBOX, INPUT_COLOR, InputElementContainer, RADIO} from '../../dom/replaced-elements/input-element-container';
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import {TEXT_ALIGN} from '../../css/property-descriptors/text-align';
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import {TextareaElementContainer} from '../../dom/elements/textarea-element-container';
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import {SelectElementContainer} from '../../dom/elements/select-element-container';
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import {IFrameElementContainer} from '../../dom/replaced-elements/iframe-element-container';
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import {TextShadow} from '../../css/property-descriptors/text-shadow';
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export type RenderConfigurations = RenderOptions & {
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backgroundColor: Color | null;
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};
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export interface RenderOptions {
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id: string;
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scale: number;
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canvas?: HTMLCanvasElement;
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x: number;
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y: number;
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scrollX: number;
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scrollY: number;
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width: number;
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height: number;
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windowWidth: number;
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windowHeight: number;
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cache: Cache;
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}
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const MASK_OFFSET = 10000;
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export class CanvasRenderer {
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canvas: HTMLCanvasElement;
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ctx: CanvasRenderingContext2D;
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options: RenderConfigurations;
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private readonly _activeEffects: IElementEffect[] = [];
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private readonly fontMetrics: FontMetrics;
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constructor(options: RenderConfigurations) {
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this.canvas = options.canvas ? options.canvas : document.createElement('canvas');
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this.ctx = this.canvas.getContext('2d') as CanvasRenderingContext2D;
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this.options = options;
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this.canvas.width = Math.floor(options.width * options.scale);
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this.canvas.height = Math.floor(options.height * options.scale);
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this.canvas.style.width = `${options.width}px`;
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this.canvas.style.height = `${options.height}px`;
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this.fontMetrics = new FontMetrics(document);
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this.ctx.scale(this.options.scale, this.options.scale);
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this.ctx.translate(-options.x + options.scrollX, -options.y + options.scrollY);
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this.ctx.textBaseline = 'bottom';
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this._activeEffects = [];
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Logger.getInstance(options.id).debug(
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`Canvas renderer initialized (${options.width}x${options.height} at ${options.x},${options.y}) with scale ${
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options.scale
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}`
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);
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}
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applyEffects(effects: IElementEffect[], target: EffectTarget) {
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while (this._activeEffects.length) {
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this.popEffect();
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}
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effects.filter(effect => contains(effect.target, target)).forEach(effect => this.applyEffect(effect));
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}
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applyEffect(effect: IElementEffect) {
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this.ctx.save();
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if (isTransformEffect(effect)) {
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this.ctx.translate(effect.offsetX, effect.offsetY);
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this.ctx.transform(
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effect.matrix[0],
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effect.matrix[1],
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effect.matrix[2],
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effect.matrix[3],
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effect.matrix[4],
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effect.matrix[5]
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);
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this.ctx.translate(-effect.offsetX, -effect.offsetY);
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}
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if (isClipEffect(effect)) {
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this.path(effect.path);
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this.ctx.clip();
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}
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this._activeEffects.push(effect);
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}
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popEffect() {
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this._activeEffects.pop();
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this.ctx.restore();
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}
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async renderStack(stack: StackingContext) {
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const styles = stack.element.container.styles;
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if (styles.isVisible()) {
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this.ctx.globalAlpha = styles.opacity;
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await this.renderStackContent(stack);
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}
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}
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async renderNode(paint: ElementPaint) {
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if (paint.container.styles.isVisible()) {
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await this.renderNodeBackgroundAndBorders(paint);
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await this.renderNodeContent(paint);
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}
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}
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renderTextWithLetterSpacing(text: TextBounds, letterSpacing: number) {
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if (letterSpacing === 0) {
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this.ctx.fillText(text.text, text.bounds.left, text.bounds.top + text.bounds.height);
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} else {
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const letters = toCodePoints(text.text).map(i => fromCodePoint(i));
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letters.reduce((left, letter) => {
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this.ctx.fillText(letter, left, text.bounds.top + text.bounds.height);
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return left + this.ctx.measureText(letter).width;
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}, text.bounds.left);
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}
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}
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private createFontStyle(styles: CSSParsedDeclaration): string[] {
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const fontVariant = styles.fontVariant
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.filter(variant => variant === 'normal' || variant === 'small-caps')
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.join('');
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const fontFamily = styles.fontFamily.join(', ');
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const fontSize = isDimensionToken(styles.fontSize)
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? `${styles.fontSize.number}${styles.fontSize.unit}`
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: `${styles.fontSize.number}px`;
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return [
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[styles.fontStyle, fontVariant, styles.fontWeight, fontSize, fontFamily].join(' '),
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fontFamily,
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fontSize
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];
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}
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async renderTextNode(text: TextContainer, styles: CSSParsedDeclaration) {
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const [font, fontFamily, fontSize] = this.createFontStyle(styles);
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this.ctx.font = font;
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text.textBounds.forEach(text => {
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this.ctx.fillStyle = asString(styles.color);
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this.renderTextWithLetterSpacing(text, styles.letterSpacing);
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const textShadows: TextShadow = styles.textShadow;
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if (textShadows.length && text.text.trim().length) {
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textShadows
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.slice(0)
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.reverse()
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.forEach(textShadow => {
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this.ctx.shadowColor = asString(textShadow.color);
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this.ctx.shadowOffsetX = textShadow.offsetX.number * this.options.scale;
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this.ctx.shadowOffsetY = textShadow.offsetY.number * this.options.scale;
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this.ctx.shadowBlur = textShadow.blur.number;
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this.ctx.fillText(text.text, text.bounds.left, text.bounds.top + text.bounds.height);
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});
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this.ctx.shadowColor = '';
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this.ctx.shadowOffsetX = 0;
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this.ctx.shadowOffsetY = 0;
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this.ctx.shadowBlur = 0;
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}
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if (styles.textDecorationLine.length) {
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this.ctx.fillStyle = asString(styles.textDecorationColor || styles.color);
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styles.textDecorationLine.forEach(textDecorationLine => {
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switch (textDecorationLine) {
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case TEXT_DECORATION_LINE.UNDERLINE:
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// Draws a line at the baseline of the font
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// TODO As some browsers display the line as more than 1px if the font-size is big,
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// need to take that into account both in position and size
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const {baseline} = this.fontMetrics.getMetrics(fontFamily, fontSize);
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this.ctx.fillRect(
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text.bounds.left,
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Math.round(text.bounds.top + baseline),
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text.bounds.width,
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1
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);
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break;
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case TEXT_DECORATION_LINE.OVERLINE:
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this.ctx.fillRect(text.bounds.left, Math.round(text.bounds.top), text.bounds.width, 1);
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break;
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case TEXT_DECORATION_LINE.LINE_THROUGH:
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// TODO try and find exact position for line-through
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const {middle} = this.fontMetrics.getMetrics(fontFamily, fontSize);
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this.ctx.fillRect(
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text.bounds.left,
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Math.ceil(text.bounds.top + middle),
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text.bounds.width,
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1
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);
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break;
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}
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});
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}
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});
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}
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renderReplacedElement(
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container: ReplacedElementContainer,
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curves: BoundCurves,
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image: HTMLImageElement | HTMLCanvasElement
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) {
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if (image && container.intrinsicWidth > 0 && container.intrinsicHeight > 0) {
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const box = contentBox(container);
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const path = calculatePaddingBoxPath(curves);
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this.path(path);
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this.ctx.save();
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this.ctx.clip();
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this.ctx.drawImage(
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image,
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0,
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0,
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container.intrinsicWidth,
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container.intrinsicHeight,
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box.left,
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box.top,
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box.width,
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box.height
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);
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this.ctx.restore();
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}
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}
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async renderNodeContent(paint: ElementPaint) {
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this.applyEffects(paint.effects, EffectTarget.CONTENT);
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const container = paint.container;
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const curves = paint.curves;
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const styles = container.styles;
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for (const child of container.textNodes) {
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await this.renderTextNode(child, styles);
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}
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if (container instanceof ImageElementContainer) {
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try {
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const image = await this.options.cache.match(container.src);
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this.renderReplacedElement(container, curves, image);
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} catch (e) {
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Logger.getInstance(this.options.id).error(`Error loading image ${container.src}`);
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}
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}
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if (container instanceof CanvasElementContainer) {
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this.renderReplacedElement(container, curves, container.canvas);
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}
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if (container instanceof SVGElementContainer) {
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try {
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const image = await this.options.cache.match(container.svg);
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this.renderReplacedElement(container, curves, image);
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} catch (e) {
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Logger.getInstance(this.options.id).error(`Error loading svg ${container.svg.substring(0, 255)}`);
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}
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}
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if (container instanceof IFrameElementContainer && container.tree) {
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const iframeRenderer = new CanvasRenderer({
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id: this.options.id,
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scale: this.options.scale,
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backgroundColor: container.backgroundColor,
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x: 0,
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y: 0,
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scrollX: 0,
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scrollY: 0,
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width: container.width,
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height: container.height,
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cache: this.options.cache,
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windowWidth: container.width,
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windowHeight: container.height
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});
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const canvas = await iframeRenderer.render(container.tree);
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if (container.width && container.height) {
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this.ctx.drawImage(
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canvas,
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0,
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0,
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container.width,
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container.height,
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container.bounds.left,
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container.bounds.top,
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container.bounds.width,
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container.bounds.height
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);
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}
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}
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if (container instanceof InputElementContainer) {
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const size = Math.min(container.bounds.width, container.bounds.height);
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if (container.type === CHECKBOX) {
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if (container.checked) {
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this.ctx.save();
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this.path([
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new Vector(container.bounds.left + size * 0.39363, container.bounds.top + size * 0.79),
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new Vector(container.bounds.left + size * 0.16, container.bounds.top + size * 0.5549),
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new Vector(container.bounds.left + size * 0.27347, container.bounds.top + size * 0.44071),
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new Vector(container.bounds.left + size * 0.39694, container.bounds.top + size * 0.5649),
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new Vector(container.bounds.left + size * 0.72983, container.bounds.top + size * 0.23),
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new Vector(container.bounds.left + size * 0.84, container.bounds.top + size * 0.34085),
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new Vector(container.bounds.left + size * 0.39363, container.bounds.top + size * 0.79)
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]);
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this.ctx.fillStyle = asString(INPUT_COLOR);
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this.ctx.fill();
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this.ctx.restore();
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}
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} else if (container.type === RADIO) {
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if (container.checked) {
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this.ctx.save();
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this.ctx.beginPath();
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this.ctx.arc(
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container.bounds.left + size / 2,
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container.bounds.top + size / 2,
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size / 4,
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0,
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Math.PI * 2,
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true
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);
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this.ctx.fillStyle = asString(INPUT_COLOR);
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this.ctx.fill();
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this.ctx.restore();
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}
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}
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}
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if (isTextInputElement(container) && container.value.length) {
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[this.ctx.font] = this.createFontStyle(styles);
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this.ctx.fillStyle = asString(styles.color);
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this.ctx.textBaseline = 'middle';
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this.ctx.textAlign = canvasTextAlign(container.styles.textAlign);
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const bounds = contentBox(container);
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let x = 0;
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switch (container.styles.textAlign) {
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case TEXT_ALIGN.CENTER:
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x += bounds.width / 2;
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break;
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case TEXT_ALIGN.RIGHT:
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x += bounds.width;
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break;
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}
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const textBounds = bounds.add(x, 0, 0, -bounds.height / 2 + 1);
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this.ctx.save();
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this.path([
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new Vector(bounds.left, bounds.top),
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new Vector(bounds.left + bounds.width, bounds.top),
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new Vector(bounds.left + bounds.width, bounds.top + bounds.height),
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new Vector(bounds.left, bounds.top + bounds.height)
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]);
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this.ctx.clip();
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this.renderTextWithLetterSpacing(new TextBounds(container.value, textBounds), styles.letterSpacing);
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this.ctx.restore();
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this.ctx.textBaseline = 'bottom';
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this.ctx.textAlign = 'left';
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}
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if (contains(container.styles.display, DISPLAY.LIST_ITEM)) {
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if (container.styles.listStyleImage !== null) {
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const img = container.styles.listStyleImage;
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if (img.type === CSSImageType.URL) {
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let image;
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const url = (img as CSSURLImage).url;
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try {
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image = await this.options.cache.match(url);
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this.ctx.drawImage(image, container.bounds.left - (image.width + 10), container.bounds.top);
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} catch (e) {
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Logger.getInstance(this.options.id).error(`Error loading list-style-image ${url}`);
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}
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}
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} else if (paint.listValue && container.styles.listStyleType !== LIST_STYLE_TYPE.NONE) {
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[this.ctx.font] = this.createFontStyle(styles);
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this.ctx.fillStyle = asString(styles.color);
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this.ctx.textBaseline = 'middle';
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this.ctx.textAlign = 'right';
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const bounds = new Bounds(
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container.bounds.left,
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container.bounds.top + getAbsoluteValue(container.styles.paddingTop, container.bounds.width),
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container.bounds.width,
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computeLineHeight(styles.lineHeight, styles.fontSize.number) / 2 + 1
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);
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this.renderTextWithLetterSpacing(new TextBounds(paint.listValue, bounds), styles.letterSpacing);
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this.ctx.textBaseline = 'bottom';
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this.ctx.textAlign = 'left';
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}
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}
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}
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async renderStackContent(stack: StackingContext) {
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// https://www.w3.org/TR/css-position-3/#painting-order
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// 1. the background and borders of the element forming the stacking context.
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await this.renderNodeBackgroundAndBorders(stack.element);
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// 2. the child stacking contexts with negative stack levels (most negative first).
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for (const child of stack.negativeZIndex) {
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await this.renderStack(child);
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}
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// 3. For all its in-flow, non-positioned, block-level descendants in tree order:
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await this.renderNodeContent(stack.element);
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for (const child of stack.nonInlineLevel) {
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await this.renderNode(child);
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}
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// 4. All non-positioned floating descendants, in tree order. For each one of these,
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// treat the element as if it created a new stacking context, but any positioned descendants and descendants
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// which actually create a new stacking context should be considered part of the parent stacking context,
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// not this new one.
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for (const child of stack.nonPositionedFloats) {
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await this.renderStack(child);
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}
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// 5. the in-flow, inline-level, non-positioned descendants, including inline tables and inline blocks.
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for (const child of stack.nonPositionedInlineLevel) {
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await this.renderStack(child);
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}
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for (const child of stack.inlineLevel) {
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await this.renderNode(child);
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}
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// 6. All positioned, opacity or transform descendants, in tree order that fall into the following categories:
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// All positioned descendants with 'z-index: auto' or 'z-index: 0', in tree order.
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// For those with 'z-index: auto', treat the element as if it created a new stacking context,
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// but any positioned descendants and descendants which actually create a new stacking context should be
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// considered part of the parent stacking context, not this new one. For those with 'z-index: 0',
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// treat the stacking context generated atomically.
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//
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// All opacity descendants with opacity less than 1
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//
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// All transform descendants with transform other than none
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for (const child of stack.zeroOrAutoZIndexOrTransformedOrOpacity) {
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await this.renderStack(child);
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}
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// 7. Stacking contexts formed by positioned descendants with z-indices greater than or equal to 1 in z-index
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// order (smallest first) then tree order.
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for (const child of stack.positiveZIndex) {
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await this.renderStack(child);
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}
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}
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mask(paths: Path[]) {
|
|
this.ctx.beginPath();
|
|
this.ctx.moveTo(0, 0);
|
|
this.ctx.lineTo(this.canvas.width, 0);
|
|
this.ctx.lineTo(this.canvas.width, this.canvas.height);
|
|
this.ctx.lineTo(0, this.canvas.height);
|
|
this.ctx.lineTo(0, 0);
|
|
this.formatPath(paths.slice(0).reverse());
|
|
this.ctx.closePath();
|
|
}
|
|
|
|
path(paths: Path[]) {
|
|
this.ctx.beginPath();
|
|
this.formatPath(paths);
|
|
this.ctx.closePath();
|
|
}
|
|
|
|
formatPath(paths: Path[]) {
|
|
paths.forEach((point, index) => {
|
|
const start: Vector = isBezierCurve(point) ? point.start : point;
|
|
if (index === 0) {
|
|
this.ctx.moveTo(start.x, start.y);
|
|
} else {
|
|
this.ctx.lineTo(start.x, start.y);
|
|
}
|
|
|
|
if (isBezierCurve(point)) {
|
|
this.ctx.bezierCurveTo(
|
|
point.startControl.x,
|
|
point.startControl.y,
|
|
point.endControl.x,
|
|
point.endControl.y,
|
|
point.end.x,
|
|
point.end.y
|
|
);
|
|
}
|
|
});
|
|
}
|
|
|
|
renderRepeat(path: Path[], pattern: CanvasPattern | CanvasGradient, offsetX: number, offsetY: number) {
|
|
this.path(path);
|
|
this.ctx.fillStyle = pattern;
|
|
this.ctx.translate(offsetX, offsetY);
|
|
this.ctx.fill();
|
|
this.ctx.translate(-offsetX, -offsetY);
|
|
}
|
|
|
|
resizeImage(image: HTMLImageElement, width: number, height: number): HTMLCanvasElement | HTMLImageElement {
|
|
if (image.width === width && image.height === height) {
|
|
return image;
|
|
}
|
|
|
|
const canvas = (this.canvas.ownerDocument as Document).createElement('canvas');
|
|
canvas.width = width;
|
|
canvas.height = height;
|
|
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
|
|
ctx.drawImage(image, 0, 0, image.width, image.height, 0, 0, width, height);
|
|
return canvas;
|
|
}
|
|
|
|
async renderBackgroundImage(container: ElementContainer) {
|
|
let index = container.styles.backgroundImage.length - 1;
|
|
for (const backgroundImage of container.styles.backgroundImage.slice(0).reverse()) {
|
|
if (backgroundImage.type === CSSImageType.URL) {
|
|
let image;
|
|
const url = (backgroundImage as CSSURLImage).url;
|
|
try {
|
|
image = await this.options.cache.match(url);
|
|
} catch (e) {
|
|
Logger.getInstance(this.options.id).error(`Error loading background-image ${url}`);
|
|
}
|
|
|
|
if (image) {
|
|
const [path, x, y, width, height] = calculateBackgroundRendering(container, index, [
|
|
image.width,
|
|
image.height,
|
|
image.width / image.height
|
|
]);
|
|
const pattern = this.ctx.createPattern(
|
|
this.resizeImage(image, width, height),
|
|
'repeat'
|
|
) as CanvasPattern;
|
|
this.renderRepeat(path, pattern, x, y);
|
|
}
|
|
} else if (isLinearGradient(backgroundImage)) {
|
|
const [path, x, y, width, height] = calculateBackgroundRendering(container, index, [null, null, null]);
|
|
const [lineLength, x0, x1, y0, y1] = calculateGradientDirection(backgroundImage.angle, width, height);
|
|
|
|
const canvas = document.createElement('canvas');
|
|
canvas.width = width;
|
|
canvas.height = height;
|
|
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
|
|
const gradient = ctx.createLinearGradient(x0, y0, x1, y1);
|
|
|
|
processColorStops(backgroundImage.stops, lineLength).forEach(colorStop =>
|
|
gradient.addColorStop(colorStop.stop, asString(colorStop.color))
|
|
);
|
|
|
|
ctx.fillStyle = gradient;
|
|
ctx.fillRect(0, 0, width, height);
|
|
if (width > 0 && height > 0) {
|
|
const pattern = this.ctx.createPattern(canvas, 'repeat') as CanvasPattern;
|
|
this.renderRepeat(path, pattern, x, y);
|
|
}
|
|
} else if (isRadialGradient(backgroundImage)) {
|
|
const [path, left, top, width, height] = calculateBackgroundRendering(container, index, [
|
|
null,
|
|
null,
|
|
null
|
|
]);
|
|
const position = backgroundImage.position.length === 0 ? [FIFTY_PERCENT] : backgroundImage.position;
|
|
const x = getAbsoluteValue(position[0], width);
|
|
const y = getAbsoluteValue(position[position.length - 1], height);
|
|
|
|
const [rx, ry] = calculateRadius(backgroundImage, x, y, width, height);
|
|
if (rx > 0 && rx > 0) {
|
|
const radialGradient = this.ctx.createRadialGradient(left + x, top + y, 0, left + x, top + y, rx);
|
|
|
|
processColorStops(backgroundImage.stops, rx * 2).forEach(colorStop =>
|
|
radialGradient.addColorStop(colorStop.stop, asString(colorStop.color))
|
|
);
|
|
|
|
this.path(path);
|
|
this.ctx.fillStyle = radialGradient;
|
|
if (rx !== ry) {
|
|
// transforms for elliptical radial gradient
|
|
const midX = container.bounds.left + 0.5 * container.bounds.width;
|
|
const midY = container.bounds.top + 0.5 * container.bounds.height;
|
|
const f = ry / rx;
|
|
const invF = 1 / f;
|
|
|
|
this.ctx.save();
|
|
this.ctx.translate(midX, midY);
|
|
this.ctx.transform(1, 0, 0, f, 0, 0);
|
|
this.ctx.translate(-midX, -midY);
|
|
|
|
this.ctx.fillRect(left, invF * (top - midY) + midY, width, height * invF);
|
|
this.ctx.restore();
|
|
} else {
|
|
this.ctx.fill();
|
|
}
|
|
}
|
|
}
|
|
index--;
|
|
}
|
|
}
|
|
|
|
async renderBorder(color: Color, side: number, curvePoints: BoundCurves) {
|
|
this.path(parsePathForBorder(curvePoints, side));
|
|
this.ctx.fillStyle = asString(color);
|
|
this.ctx.fill();
|
|
}
|
|
|
|
async renderNodeBackgroundAndBorders(paint: ElementPaint) {
|
|
this.applyEffects(paint.effects, EffectTarget.BACKGROUND_BORDERS);
|
|
const styles = paint.container.styles;
|
|
const hasBackground = !isTransparent(styles.backgroundColor) || styles.backgroundImage.length;
|
|
|
|
const borders = [
|
|
{style: styles.borderTopStyle, color: styles.borderTopColor},
|
|
{style: styles.borderRightStyle, color: styles.borderRightColor},
|
|
{style: styles.borderBottomStyle, color: styles.borderBottomColor},
|
|
{style: styles.borderLeftStyle, color: styles.borderLeftColor}
|
|
];
|
|
|
|
const backgroundPaintingArea = calculateBackgroundCurvedPaintingArea(
|
|
getBackgroundValueForIndex(styles.backgroundClip, 0),
|
|
paint.curves
|
|
);
|
|
|
|
if (hasBackground || styles.boxShadow.length) {
|
|
this.ctx.save();
|
|
this.path(backgroundPaintingArea);
|
|
this.ctx.clip();
|
|
|
|
if (!isTransparent(styles.backgroundColor)) {
|
|
this.ctx.fillStyle = asString(styles.backgroundColor);
|
|
this.ctx.fill();
|
|
}
|
|
|
|
await this.renderBackgroundImage(paint.container);
|
|
|
|
this.ctx.restore();
|
|
|
|
styles.boxShadow
|
|
.slice(0)
|
|
.reverse()
|
|
.forEach(shadow => {
|
|
this.ctx.save();
|
|
const borderBoxArea = calculateBorderBoxPath(paint.curves);
|
|
const maskOffset = shadow.inset ? 0 : MASK_OFFSET;
|
|
const shadowPaintingArea = transformPath(
|
|
borderBoxArea,
|
|
-maskOffset + (shadow.inset ? 1 : -1) * shadow.spread.number,
|
|
(shadow.inset ? 1 : -1) * shadow.spread.number,
|
|
shadow.spread.number * (shadow.inset ? -2 : 2),
|
|
shadow.spread.number * (shadow.inset ? -2 : 2)
|
|
);
|
|
|
|
if (shadow.inset) {
|
|
this.path(borderBoxArea);
|
|
this.ctx.clip();
|
|
this.mask(shadowPaintingArea);
|
|
} else {
|
|
this.mask(borderBoxArea);
|
|
this.ctx.clip();
|
|
this.path(shadowPaintingArea);
|
|
}
|
|
|
|
this.ctx.shadowOffsetX = shadow.offsetX.number + maskOffset;
|
|
this.ctx.shadowOffsetY = shadow.offsetY.number;
|
|
this.ctx.shadowColor = asString(shadow.color);
|
|
this.ctx.shadowBlur = shadow.blur.number;
|
|
this.ctx.fillStyle = shadow.inset ? asString(shadow.color) : 'rgba(0,0,0,1)';
|
|
|
|
this.ctx.fill();
|
|
this.ctx.restore();
|
|
});
|
|
}
|
|
|
|
let side = 0;
|
|
for (const border of borders) {
|
|
if (border.style !== BORDER_STYLE.NONE && !isTransparent(border.color)) {
|
|
await this.renderBorder(border.color, side, paint.curves);
|
|
}
|
|
side++;
|
|
}
|
|
}
|
|
|
|
async render(element: ElementContainer): Promise<HTMLCanvasElement> {
|
|
if (this.options.backgroundColor) {
|
|
this.ctx.fillStyle = asString(this.options.backgroundColor);
|
|
this.ctx.fillRect(
|
|
this.options.x - this.options.scrollX,
|
|
this.options.y - this.options.scrollY,
|
|
this.options.width,
|
|
this.options.height
|
|
);
|
|
}
|
|
|
|
const stack = parseStackingContexts(element);
|
|
|
|
await this.renderStack(stack);
|
|
this.applyEffects([], EffectTarget.BACKGROUND_BORDERS);
|
|
return this.canvas;
|
|
}
|
|
}
|
|
|
|
const isTextInputElement = (
|
|
container: ElementContainer
|
|
): container is InputElementContainer | TextareaElementContainer | SelectElementContainer => {
|
|
if (container instanceof TextareaElementContainer) {
|
|
return true;
|
|
} else if (container instanceof SelectElementContainer) {
|
|
return true;
|
|
} else if (container instanceof InputElementContainer && container.type !== RADIO && container.type !== CHECKBOX) {
|
|
return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
const calculateBackgroundCurvedPaintingArea = (clip: BACKGROUND_CLIP, curves: BoundCurves): Path[] => {
|
|
switch (clip) {
|
|
case BACKGROUND_CLIP.BORDER_BOX:
|
|
return calculateBorderBoxPath(curves);
|
|
case BACKGROUND_CLIP.CONTENT_BOX:
|
|
return calculateContentBoxPath(curves);
|
|
case BACKGROUND_CLIP.PADDING_BOX:
|
|
default:
|
|
return calculatePaddingBoxPath(curves);
|
|
}
|
|
};
|
|
|
|
const canvasTextAlign = (textAlign: TEXT_ALIGN): CanvasTextAlign => {
|
|
switch (textAlign) {
|
|
case TEXT_ALIGN.CENTER:
|
|
return 'center';
|
|
case TEXT_ALIGN.RIGHT:
|
|
return 'right';
|
|
case TEXT_ALIGN.LEFT:
|
|
default:
|
|
return 'left';
|
|
}
|
|
};
|