400 lines
14 KiB
JavaScript
400 lines
14 KiB
JavaScript
/* @flow */
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'use strict';
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import type Color from './Color';
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import type {Path} from './drawing/Path';
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import type Size from './drawing/Size';
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import type Logger from './Logger';
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import type {BackgroundImage} from './parsing/background';
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import type {Border, BorderSide} from './parsing/border';
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import type {Font} from './parsing/font';
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import type {TextDecoration} from './parsing/textDecoration';
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import type {TextShadow} from './parsing/textShadow';
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import type {Matrix} from './parsing/transform';
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import type {BoundCurves} from './Bounds';
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import type {Gradient} from './Gradient';
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import type {ImageStore, ImageElement} from './ImageLoader';
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import type NodeContainer from './NodeContainer';
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import type StackingContext from './StackingContext';
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import type {TextBounds} from './TextBounds';
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import {
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Bounds,
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parsePathForBorder,
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calculateContentBox,
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calculatePaddingBox,
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calculatePaddingBoxPath
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} from './Bounds';
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import {FontMetrics} from './Font';
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import {parseGradient} from './Gradient';
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import TextContainer from './TextContainer';
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import {
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BACKGROUND_ORIGIN,
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calculateBackgroungPaintingArea,
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calculateBackgroundPosition,
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calculateBackgroundRepeatPath,
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calculateBackgroundSize
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} from './parsing/background';
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import {BORDER_STYLE} from './parsing/border';
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export type RenderOptions = {
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scale: number,
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backgroundColor: ?Color,
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imageStore: ImageStore,
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fontMetrics: FontMetrics,
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logger: Logger,
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width: number,
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height: number
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};
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export interface RenderTarget<Output> {
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clip(clipPaths: Array<Path>, callback: () => void): void,
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drawImage(image: ImageElement, source: Bounds, destination: Bounds): void,
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drawShape(path: Path, color: Color): void,
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fill(color: Color): void,
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getTarget(): Promise<Output>,
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rectangle(x: number, y: number, width: number, height: number, color: Color): void,
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render(options: RenderOptions): void,
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renderLinearGradient(bounds: Bounds, gradient: Gradient): void,
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renderRepeat(
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path: Path,
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image: ImageElement,
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imageSize: Size,
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offsetX: number,
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offsetY: number
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): void,
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renderTextNode(
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textBounds: Array<TextBounds>,
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color: Color,
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font: Font,
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textDecoration: TextDecoration | null,
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textShadows: Array<TextShadow> | null
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): void,
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setOpacity(opacity: number): void,
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transform(offsetX: number, offsetY: number, matrix: Matrix, callback: () => void): void
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}
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export default class Renderer {
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target: RenderTarget<*>;
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options: RenderOptions;
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_opacity: ?number;
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constructor(target: RenderTarget<*>, options: RenderOptions) {
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this.target = target;
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this.options = options;
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target.render(options);
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}
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renderNode(container: NodeContainer) {
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if (container.isVisible()) {
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this.renderNodeBackgroundAndBorders(container);
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this.renderNodeContent(container);
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}
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}
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renderNodeContent(container: NodeContainer) {
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const callback = () => {
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if (container.childNodes.length) {
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container.childNodes.forEach(child => {
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if (child instanceof TextContainer) {
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const style = child.parent.style;
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this.target.renderTextNode(
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child.bounds,
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style.color,
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style.font,
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style.textDecoration,
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style.textShadow
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);
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} else {
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this.target.drawShape(child, container.style.color);
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}
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});
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}
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if (container.image) {
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const image = this.options.imageStore.get(container.image);
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if (image) {
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const contentBox = calculateContentBox(
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container.bounds,
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container.style.padding,
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container.style.border
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);
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const width = typeof image.width === 'number' ? image.width : contentBox.width;
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const height =
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typeof image.height === 'number' ? image.height : contentBox.height;
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this.target.clip([calculatePaddingBoxPath(container.curvedBounds)], () => {
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this.target.drawImage(image, new Bounds(0, 0, width, height), contentBox);
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});
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}
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}
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};
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const paths = container.getClipPaths();
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if (paths.length) {
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this.target.clip(paths, callback);
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} else {
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callback();
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}
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}
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renderNodeBackgroundAndBorders(container: NodeContainer) {
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const HAS_BACKGROUND =
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!container.style.background.backgroundColor.isTransparent() ||
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container.style.background.backgroundImage.length;
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const renderableBorders = container.style.border.filter(
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border =>
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border.borderStyle !== BORDER_STYLE.NONE && !border.borderColor.isTransparent()
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);
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const callback = () => {
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const backgroundPaintingArea = calculateBackgroungPaintingArea(
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container.curvedBounds,
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container.style.background.backgroundClip
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);
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if (HAS_BACKGROUND) {
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this.target.clip([backgroundPaintingArea], () => {
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if (!container.style.background.backgroundColor.isTransparent()) {
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this.target.fill(container.style.background.backgroundColor);
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}
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this.renderBackgroundImage(container);
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});
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}
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renderableBorders.forEach((border, side) => {
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this.renderBorder(border, side, container.curvedBounds);
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});
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};
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if (HAS_BACKGROUND || renderableBorders.length) {
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const paths = container.parent ? container.parent.getClipPaths() : [];
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if (paths.length) {
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this.target.clip(paths, callback);
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} else {
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callback();
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}
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}
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}
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renderBackgroundImage(container: NodeContainer) {
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container.style.background.backgroundImage.slice(0).reverse().forEach(backgroundImage => {
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if (backgroundImage.source.method === 'url' && backgroundImage.source.args.length) {
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this.renderBackgroundRepeat(container, backgroundImage);
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} else {
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const gradient = parseGradient(backgroundImage.source, container.bounds);
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if (gradient) {
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const bounds = container.bounds;
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this.target.renderLinearGradient(bounds, gradient);
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}
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}
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});
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}
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renderBackgroundRepeat(container: NodeContainer, background: BackgroundImage) {
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const image = this.options.imageStore.get(background.source.args[0]);
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if (image) {
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const bounds = container.bounds;
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const paddingBox = calculatePaddingBox(bounds, container.style.border);
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const backgroundImageSize = calculateBackgroundSize(background, image, bounds);
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// TODO support CONTENT_BOX
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const backgroundPositioningArea =
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container.style.background.backgroundOrigin === BACKGROUND_ORIGIN.BORDER_BOX
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? bounds
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: paddingBox;
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const position = calculateBackgroundPosition(
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background.position,
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backgroundImageSize,
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backgroundPositioningArea
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);
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const path = calculateBackgroundRepeatPath(
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background,
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position,
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backgroundImageSize,
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backgroundPositioningArea,
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bounds
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);
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const offsetX = Math.round(paddingBox.left + position.x);
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const offsetY = Math.round(paddingBox.top + position.y);
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this.target.renderRepeat(path, image, backgroundImageSize, offsetX, offsetY);
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}
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}
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renderBorder(border: Border, side: BorderSide, curvePoints: BoundCurves) {
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this.target.drawShape(parsePathForBorder(curvePoints, side), border.borderColor);
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}
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renderStack(stack: StackingContext) {
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if (stack.container.isVisible()) {
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const opacity = stack.getOpacity();
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if (opacity !== this._opacity) {
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this.target.setOpacity(stack.getOpacity());
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this._opacity = opacity;
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}
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const transform = stack.container.style.transform;
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if (transform !== null) {
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this.target.transform(
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stack.container.bounds.left + transform.transformOrigin[0].value,
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stack.container.bounds.top + transform.transformOrigin[1].value,
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transform.transform,
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() => this.renderStackContent(stack)
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);
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} else {
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this.renderStackContent(stack);
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}
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}
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}
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renderStackContent(stack: StackingContext) {
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const [
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negativeZIndex,
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zeroOrAutoZIndexOrTransformedOrOpacity,
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positiveZIndex,
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nonPositionedFloats,
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nonPositionedInlineLevel
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] = splitStackingContexts(stack);
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const [inlineLevel, nonInlineLevel] = splitDescendants(stack);
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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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this.renderNodeBackgroundAndBorders(stack.container);
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// 2. the child stacking contexts with negative stack levels (most negative first).
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negativeZIndex.sort(sortByZIndex).forEach(this.renderStack, this);
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// 3. For all its in-flow, non-positioned, block-level descendants in tree order:
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this.renderNodeContent(stack.container);
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nonInlineLevel.forEach(this.renderNode, this);
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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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nonPositionedFloats.forEach(this.renderStack, this);
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// 5. the in-flow, inline-level, non-positioned descendants, including inline tables and inline blocks.
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nonPositionedInlineLevel.forEach(this.renderStack, this);
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inlineLevel.forEach(this.renderNode, this);
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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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zeroOrAutoZIndexOrTransformedOrOpacity.forEach(this.renderStack, this);
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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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positiveZIndex.sort(sortByZIndex).forEach(this.renderStack, this);
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}
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render(stack: StackingContext): Promise<*> {
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if (this.options.backgroundColor) {
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this.target.rectangle(
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0,
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0,
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this.options.width,
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this.options.height,
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this.options.backgroundColor
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);
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}
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this.renderStack(stack);
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const target = this.target.getTarget();
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if (__DEV__) {
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return target.then(output => {
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this.options.logger.log(`Render completed`);
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return output;
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});
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}
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return target;
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}
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}
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const splitDescendants = (stack: StackingContext): [Array<NodeContainer>, Array<NodeContainer>] => {
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const inlineLevel = [];
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const nonInlineLevel = [];
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const length = stack.children.length;
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for (let i = 0; i < length; i++) {
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let child = stack.children[i];
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if (child.isInlineLevel()) {
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inlineLevel.push(child);
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} else {
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nonInlineLevel.push(child);
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}
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}
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return [inlineLevel, nonInlineLevel];
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};
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const splitStackingContexts = (
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stack: StackingContext
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): [
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Array<StackingContext>,
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Array<StackingContext>,
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Array<StackingContext>,
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Array<StackingContext>,
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Array<StackingContext>
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] => {
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const negativeZIndex = [];
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const zeroOrAutoZIndexOrTransformedOrOpacity = [];
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const positiveZIndex = [];
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const nonPositionedFloats = [];
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const nonPositionedInlineLevel = [];
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const length = stack.contexts.length;
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for (let i = 0; i < length; i++) {
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let child = stack.contexts[i];
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if (
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child.container.isPositioned() ||
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child.container.style.opacity < 1 ||
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child.container.isTransformed()
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) {
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if (child.container.style.zIndex.order < 0) {
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negativeZIndex.push(child);
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} else if (child.container.style.zIndex.order > 0) {
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positiveZIndex.push(child);
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} else {
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zeroOrAutoZIndexOrTransformedOrOpacity.push(child);
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}
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} else {
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if (child.container.isFloating()) {
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nonPositionedFloats.push(child);
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} else {
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nonPositionedInlineLevel.push(child);
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}
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}
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}
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return [
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negativeZIndex,
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zeroOrAutoZIndexOrTransformedOrOpacity,
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positiveZIndex,
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nonPositionedFloats,
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nonPositionedInlineLevel
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];
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};
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const sortByZIndex = (a: StackingContext, b: StackingContext): number => {
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if (a.container.style.zIndex.order > b.container.style.zIndex.order) {
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return 1;
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} else if (a.container.style.zIndex.order < b.container.style.zIndex.order) {
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return -1;
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}
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return 0;
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};
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