mirror of
https://github.com/niklasvh/html2canvas.git
synced 2023-08-10 21:13:10 +03:00
feat: box-shadow rendering (#1848)
* feat: box-shadow rendering * test: add box-shadow test
This commit is contained in:
Niklas von Hertzen
GitHub
parent
522a443055
commit
5f31b74177
@ -72,6 +72,7 @@ import {content} from './property-descriptors/content';
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import {counterIncrement} from './property-descriptors/counter-increment';
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import {counterReset} from './property-descriptors/counter-reset';
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import {quotes} from './property-descriptors/quotes';
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import {boxShadow} from './property-descriptors/box-shadow';
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export class CSSParsedDeclaration {
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backgroundClip: ReturnType<typeof backgroundClip.parse>;
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@ -97,6 +98,7 @@ export class CSSParsedDeclaration {
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borderRightWidth: ReturnType<typeof borderRightWidth.parse>;
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borderBottomWidth: ReturnType<typeof borderBottomWidth.parse>;
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borderLeftWidth: ReturnType<typeof borderLeftWidth.parse>;
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boxShadow: ReturnType<typeof boxShadow.parse>;
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color: Color;
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display: ReturnType<typeof display.parse>;
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float: ReturnType<typeof float.parse>;
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@ -158,6 +160,7 @@ export class CSSParsedDeclaration {
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this.borderRightWidth = parse(borderRightWidth, declaration.borderRightWidth);
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this.borderBottomWidth = parse(borderBottomWidth, declaration.borderBottomWidth);
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this.borderLeftWidth = parse(borderLeftWidth, declaration.borderLeftWidth);
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this.boxShadow = parse(boxShadow, declaration.boxShadow);
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this.color = parse(color, declaration.color);
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this.display = parse(display, declaration.display);
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this.float = parse(float, declaration.cssFloat);
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59
src/css/property-descriptors/box-shadow.ts
Normal file
59
src/css/property-descriptors/box-shadow.ts
Normal file
@ -0,0 +1,59 @@
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import {PropertyDescriptorParsingType, IPropertyListDescriptor} from '../IPropertyDescriptor';
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import {CSSValue, isIdentWithValue, parseFunctionArgs} from '../syntax/parser';
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import {ZERO_LENGTH} from '../types/length-percentage';
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import {color, Color} from '../types/color';
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import {isLength, Length} from '../types/length';
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export type BoxShadow = BoxShadowItem[];
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interface BoxShadowItem {
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inset: boolean;
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color: Color;
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offsetX: Length;
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offsetY: Length;
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blur: Length;
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spread: Length;
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}
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export const boxShadow: IPropertyListDescriptor<BoxShadow> = {
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name: 'box-shadow',
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initialValue: 'none',
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type: PropertyDescriptorParsingType.LIST,
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prefix: false,
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parse: (tokens: CSSValue[]): BoxShadow => {
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if (tokens.length === 1 && isIdentWithValue(tokens[0], 'none')) {
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return [];
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}
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return parseFunctionArgs(tokens).map((values: CSSValue[]) => {
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const shadow: BoxShadowItem = {
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color: 0x000000ff,
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offsetX: ZERO_LENGTH,
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offsetY: ZERO_LENGTH,
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blur: ZERO_LENGTH,
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spread: ZERO_LENGTH,
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inset: false
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};
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let c = 0;
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for (let i = 0; i < values.length; i++) {
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const token = values[i];
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if (isIdentWithValue(token, 'inset')) {
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shadow.inset = true;
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} else if (isLength(token)) {
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if (c === 0) {
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shadow.offsetX = token;
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} else if (c === 1) {
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shadow.offsetY = token;
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} else if (c === 2) {
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shadow.blur = token;
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} else {
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shadow.spread = token;
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}
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c++;
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} else {
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shadow.color = color.parse(token);
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}
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}
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return shadow;
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});
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}
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};
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@ -30,6 +30,15 @@ export class BezierCurve implements IPath {
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return firstHalf ? new BezierCurve(this.start, ab, abbc, dest) : new BezierCurve(dest, bccd, cd, this.end);
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}
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add(deltaX: number, deltaY: number): BezierCurve {
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return new BezierCurve(
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this.start.add(deltaX, deltaY),
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this.startControl.add(deltaX, deltaY),
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this.endControl.add(deltaX, deltaY),
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this.end.add(deltaX, deltaY)
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);
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}
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reverse(): BezierCurve {
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return new BezierCurve(this.end, this.endControl, this.startControl, this.start);
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}
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@ -5,7 +5,7 @@ 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} from '../path';
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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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@ -55,6 +55,8 @@ export interface RenderOptions {
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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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@ -471,9 +473,24 @@ export class CanvasRenderer {
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}
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}
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mask(paths: Path[]) {
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this.ctx.beginPath();
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this.ctx.moveTo(0, 0);
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this.ctx.lineTo(this.canvas.width, 0);
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this.ctx.lineTo(this.canvas.width, this.canvas.height);
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this.ctx.lineTo(0, this.canvas.height);
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this.ctx.lineTo(0, 0);
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this.formatPath(paths.slice(0).reverse());
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this.ctx.closePath();
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}
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path(paths: Path[]) {
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this.ctx.beginPath();
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this.formatPath(paths);
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this.ctx.closePath();
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}
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formatPath(paths: Path[]) {
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paths.forEach((point, index) => {
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const start: Vector = isBezierCurve(point) ? point.start : point;
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if (index === 0) {
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@ -493,8 +510,6 @@ export class CanvasRenderer {
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);
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}
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});
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this.ctx.closePath();
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}
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renderRepeat(path: Path[], pattern: CanvasPattern | CanvasGradient, offsetX: number, offsetY: number) {
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@ -626,7 +641,7 @@ export class CanvasRenderer {
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paint.curves
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);
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if (hasBackground) {
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if (hasBackground || styles.boxShadow.length) {
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this.ctx.save();
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this.path(backgroundPaintingArea);
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this.ctx.clip();
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@ -639,6 +654,41 @@ export class CanvasRenderer {
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await this.renderBackgroundImage(paint.container);
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this.ctx.restore();
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styles.boxShadow
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.slice(0)
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.reverse()
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.forEach(shadow => {
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this.ctx.save();
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const borderBoxArea = calculateBorderBoxPath(paint.curves);
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const maskOffset = shadow.inset ? 0 : MASK_OFFSET;
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const shadowPaintingArea = transformPath(
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borderBoxArea,
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-maskOffset + (shadow.inset ? 1 : -1) * shadow.spread.number,
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(shadow.inset ? 1 : -1) * shadow.spread.number,
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shadow.spread.number * (shadow.inset ? -2 : 2),
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shadow.spread.number * (shadow.inset ? -2 : 2)
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);
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if (shadow.inset) {
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this.path(borderBoxArea);
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this.ctx.clip();
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this.mask(shadowPaintingArea);
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} else {
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this.mask(borderBoxArea);
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this.ctx.clip();
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this.path(shadowPaintingArea);
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}
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this.ctx.shadowOffsetX = shadow.offsetX.number + maskOffset;
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this.ctx.shadowOffsetY = shadow.offsetY.number;
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this.ctx.shadowColor = asString(shadow.color);
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this.ctx.shadowBlur = shadow.blur.number;
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this.ctx.fillStyle = shadow.inset ? asString(shadow.color) : 'rgba(0,0,0,1)';
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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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let side = 0;
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@ -7,6 +7,7 @@ export enum PathType {
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export interface IPath {
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type: PathType;
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add(deltaX: number, deltaY: number): IPath;
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}
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export const equalPath = (a: Path[], b: Path[]): boolean => {
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@ -17,4 +18,20 @@ export const equalPath = (a: Path[], b: Path[]): boolean => {
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return false;
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};
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export const transformPath = (path: Path[], deltaX: number, deltaY: number, deltaW: number, deltaH: number): Path[] => {
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return path.map((point, index) => {
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switch (index) {
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case 0:
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return point.add(deltaX, deltaY);
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case 1:
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return point.add(deltaX + deltaW, deltaY);
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case 2:
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return point.add(deltaX + deltaW, deltaY + deltaH);
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case 3:
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return point.add(deltaX, deltaY + deltaH);
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}
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return point;
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});
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};
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export type Path = Vector | BezierCurve;
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@ -10,6 +10,10 @@ export class Vector implements IPath {
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this.x = x;
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this.y = y;
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}
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add(deltaX: number, deltaY: number): Vector {
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return new Vector(this.x + deltaX, this.y + deltaY);
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}
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}
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export const isVector = (path: Path): path is Vector => path.type === PathType.VECTOR;
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118
tests/reftests/background/box-shadow.html
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118
tests/reftests/background/box-shadow.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>box-shadow tests</title>
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<script type="text/javascript" src="../../test.js"></script>
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<style>
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.boxshadow {
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margin: 10px;
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display: inline-block;
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min-height: 50px;
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// border-radius: 10px;
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}
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body {
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max-width: 800px;
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}
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</style>
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</head>
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<body>
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<div style="box-shadow: 0 0 0 0.5em;" class="boxshadow">0 0 0 0.5em;</div>
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<div style="box-shadow: 0 0 1em;" class="boxshadow">0 0 1em;</div>
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<div style="box-shadow: 1em 0.5em;" class="boxshadow">1em 0.5em;</div>
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<div style="box-shadow: 1em 0.5em 1em;" class="boxshadow">1em 0.5em 1em;</div>
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<div style="box-shadow: 0 2em 1em -0.7em;" class="boxshadow">0 2em 1em -0.7em;</div>
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<div style="box-shadow: 0.3em 0.3em lightgreen;" class="boxshadow">0.3em 0.3em lightgreen;</div>
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<div style="box-shadow: 0.3em 0.3em 0 0.6em lightgreen;" class="boxshadow">0.3em 0.3em 0 0.6em lightgreen;</div>
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<div style="box-shadow: 0 2em 0 -0.9em lightgreen;" class="boxshadow">0 2em 0 -0.9em lightgreen;</div>
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<div style="box-shadow: 2em 1.5em 0 -0.7em lightgreen;" class="boxshadow">2em 1.5em 0 -0.7em lightgreen;</div>
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<div style="box-shadow: 9em 1.2em 0 -0.6em lightgreen;" class="boxshadow">9em 1.2em 0 -0.6em lightgreen;</div>
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<div style="box-shadow: -27.3em 0 lightgreen;" class="boxshadow">-27.3em 0 lightgreen;</div>
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<div style="box-shadow: 0 2em 0 -1em lightgreen;" class="boxshadow">0 2em 0 -1em lightgreen;</div>
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<div style="box-shadow: 0 0 1em maroon;" class="boxshadow">0 0 1em maroon;</div>
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<div style="box-shadow: 0 0 1em 0.5em maroon;" class="boxshadow">0 0 1em 0.5em maroon;</div>
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<div style="margin-top:3em;box-shadow: 0 0 1em 1em maroon;" class="boxshadow">0 0 1em 1em maroon;</div>
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<div style="box-shadow: -0.4em -0.4em 1em olive;" class="boxshadow">-0.4em -0.4em 1em olive;</div>
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<div style="box-shadow: 0.4em 0.4em 1em olive;" class="boxshadow">0.4em 0.4em 1em olive;</div>
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<div style="box-shadow: 0.4em 0.4em 1em -0.2em olive;" class="boxshadow">0.4em 0.4em 1em -0.2em olive;</div>
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<div style="box-shadow: 0.4em 0.4em 1em 0.4em olive;" class="boxshadow">0.4em 0.4em 1em 0.4em olive;</div>
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<div style="box-shadow: 0 1.5em 0.5em -1em olive;" class="boxshadow">0 1.5em 0.5em -1em olive;</div>
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<div style="box-shadow: inset 0.2em 0.4em red, inset -1em -0.7em red;" class="boxshadow">inset 0.2em 0.4em red, inset
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-1em -0.7em red;
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</div>
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<div style="box-shadow: inset 11em 0 red;" class="boxshadow">inset 11em 0 red;</div>
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<div style="box-shadow: inset -1em 0 red;" class="boxshadow">inset -1em 0 red;</div>
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<div style="box-shadow: inset 13em 0 3em -3em orange, inset -3em 0 3em -3em blue;" class="boxshadow">inset 13em 0 3em
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-3em orange,inset -3em 0 3em -3em blue;
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</div>
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<div style="box-shadow: inset 11em 0 2em orange;" class="boxshadow">inset 11em 0 2em orange;</div>
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<div style="box-shadow: inset 0 0.3em red;" class="boxshadow">inset 0 0.3em red;</div>
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<div style="box-shadow: inset 0 -1.1em red;" class="boxshadow">inset 0 -1.1em red;</div>
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<div style="box-shadow: inset 1em 0 1em -1em blue;" class="boxshadow">inset 1em 0 1em -1em blue;</div>
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<div style="box-shadow: inset 0 0 0.5em blue;" class="boxshadow">inset 0 0 0.5em blue;</div>
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<div style="box-shadow: inset 0 0 2em blue;" class="boxshadow">inset 0 0 2em blue;</div>
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<div style="box-shadow: inset 0 2em 3em -1em green;" class="boxshadow">inset 0 2em 3em -1em green;</div>
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<div style="box-shadow: inset 0 2em 3em -2em green;" class="boxshadow">inset 0 2em 3em -2em green;</div>
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<div style="box-shadow: inset 0 2em 3em -3em green;" class="boxshadow">inset 0 2em 3em -3em green;</div>
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<div style="box-shadow: inset 0 0 1em khaki;" class="boxshadow">inset 0 0 1em khaki;</div>
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<div style="box-shadow: inset 0 0 1em khaki, inset 0 0 1em khaki, inset 0 0 1em khaki, inset 0 0 1em khaki;"
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class="boxshadow">inset 0 0 1em khaki, inset 0 0 1em khaki, inset 0 0 1em khaki, inset 0 0 1em khaki;
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</div>
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<div style="box-shadow: inset 0 0 0.5em 0.5em khaki;" class="boxshadow">inset 0 0 0.5em 0.5em khaki;</div>
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<div class="boxshadow">/* seamless if <blur-radius> ≤ <spread-radius> */</div>
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<div style="box-shadow: inset 0 0 0.5em 0.5em khaki;background:black;color:gold;" class="boxshadow">inset 0 0 0.5em
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0.5em khaki;
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</div>
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<div style="box-shadow: inset 0 0 2em 2em khaki;background:red;padding:2em;" class="boxshadow">inset 0 0 2em 2em
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khaki;
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</div>
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<div style="box-shadow: 0 0 0.5em 0.5em teal;background:teal;color:gold;" class="boxshadow">0 0 0.5em 0.5em teal;</div>
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<div style="box-shadow: inset 0 0 0.5em 0.5em indigo, 0 0 0.5em 0.5em indigo;padding:1em;margin-top:3em;"
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class="boxshadow">inset 0 0 0.5em 0.5em indigo,
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0 0 0.5em 0.5em indigo;
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</div>
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<div style="box-shadow: inset 0 0 1em black, inset 0 0 1em black, inset 0 0 1em black, inset 0 0 1em black;"
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class="boxshadow">inset 0 0 1em black, inset 0 0 1em black,
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inset 0 0 1em black, inset 0 0 1em black;
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</div>
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<div style="box-shadow: inset 0 0 0.7em 0.5em black;" class="boxshadow">inset 0 0 0.7em 0.5em black;
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/* should be very similar to above */
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</div>
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<div style="box-shadow: inset 0 2em 3em -1.5em green, inset 0 -2em 3em -2em blue;" class="boxshadow">inset 0 2em 3em
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-1.5em green,
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inset 0 -2em 3em -2em blue;
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</div>
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<div style="box-shadow: inset 1em 1em 2em -1em blue;" class="boxshadow">inset 1em 1em 2em -1em blue;</div>
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<div style="box-shadow: inset 1em 1em 2em -1em blue, inset -1em -1em 2em -1em red;" class="boxshadow">inset 1em 1em 2em
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-1em blue,
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inset -1em -1em 2em -1em red;
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</div>
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<div style="box-shadow: inset 0 2em 3em -2em white, inset 0 -2em 3em -2.5em black;background:red;" class="boxshadow">
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inset 0 2em 3em -2em white,
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inset 0 -2em 3em -2.5em black;
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</div>
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<div style="box-shadow: inset 1em 1em 1em -1em white, inset -1em -1em 1em -1em black;background:red;" class="boxshadow">
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inset 1em 1em 1em -1em white,
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inset -1em -1em 1em -1em black;
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</div>
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<div style="box-shadow: inset -1em -1em 1em -1em black, inset 1em 1em 1em -1em white;background:red;" class="boxshadow">
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inset -1em -1em 1em -1em black,
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inset 1em 1em 1em -1em white;
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</div>
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<div
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style="box-shadow: inset -0.3em -0.3em 0.6em rgba(0,0,0,0.5), inset 0.3em 0.3em 0.6em rgba(256,256,256,0.7);background:red;"
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class="boxshadow">inset -0.3em -0.3em 0.6em rgba(0,0,0,0.5),
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inset 0.3em 0.3em 0.6em rgba(256,256,256,0.7);
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</div>
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<div
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style="box-shadow: inset 0.3em 0.3em 0.6em rgba(256,256,256,0.5), inset -0.3em -0.3em 0.6em rgba(0,0,0,0.5);background:red;"
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class="boxshadow">inset 0.3em 0.3em 0.6em rgba(256,256,256,0.5),
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inset -0.3em -0.3em 0.6em rgba(0,0,0,0.5);
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</div>
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<div style="box-shadow: 0.2em 0.2em 0.7em black, inset 0 0 0.7em red;" class="boxshadow">0.2em 0.2em 0.7em black, inset
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0 0 0.7em red;
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</div>
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</body>
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</html>
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