Merge remote-tracking branch 'upstream/master' into rounding
This commit is contained in:
Daniel Imms
@@ -0,0 +1,585 @@
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/**
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* Copyright (c) 2017 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { IRenderDimensions } from 'browser/renderer/Types';
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import { IRenderLayer } from './Types';
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import { ICellData, IColor } from 'common/Types';
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import { DEFAULT_COLOR, WHITESPACE_CELL_CHAR, WHITESPACE_CELL_CODE, Attributes } from 'common/buffer/Constants';
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import { IGlyphIdentifier } from './atlas/Types';
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import { DIM_OPACITY, INVERTED_DEFAULT_COLOR, TEXT_BASELINE } from 'browser/renderer/Constants';
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import { BaseCharAtlas } from './atlas/BaseCharAtlas';
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import { acquireCharAtlas } from './atlas/CharAtlasCache';
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import { AttributeData } from 'common/buffer/AttributeData';
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import { IColorSet } from 'browser/Types';
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import { CellData } from 'common/buffer/CellData';
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import { IBufferService, IDecorationService, IOptionsService } from 'common/services/Services';
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import { excludeFromContrastRatioDemands, throwIfFalsy } from 'browser/renderer/RendererUtils';
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import { channels, color, rgba } from 'common/Color';
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import { removeElementFromParent } from 'browser/Dom';
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import { tryDrawCustomChar } from 'browser/renderer/CustomGlyphs';
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export abstract class BaseRenderLayer implements IRenderLayer {
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private _canvas: HTMLCanvasElement;
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protected _ctx!: CanvasRenderingContext2D;
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private _scaledCharWidth: number = 0;
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private _scaledCharHeight: number = 0;
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private _scaledCellWidth: number = 0;
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private _scaledCellHeight: number = 0;
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private _scaledCharLeft: number = 0;
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private _scaledCharTop: number = 0;
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private _selectionStart: [number, number] | undefined;
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private _selectionEnd: [number, number] | undefined;
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private _columnSelectMode: boolean = false;
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protected _charAtlas: BaseCharAtlas | undefined;
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/**
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* An object that's reused when drawing glyphs in order to reduce GC.
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*/
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private _currentGlyphIdentifier: IGlyphIdentifier = {
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chars: '',
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code: 0,
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bg: 0,
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fg: 0,
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bold: false,
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dim: false,
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italic: false
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};
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public get canvas(): HTMLCanvasElement { return this._canvas; }
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constructor(
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private _container: HTMLElement,
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id: string,
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zIndex: number,
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private _alpha: boolean,
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protected _colors: IColorSet,
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private _rendererId: number,
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protected readonly _bufferService: IBufferService,
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protected readonly _optionsService: IOptionsService,
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protected readonly _decorationService: IDecorationService
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) {
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this._canvas = document.createElement('canvas');
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this._canvas.classList.add(`xterm-${id}-layer`);
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this._canvas.style.zIndex = zIndex.toString();
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this._initCanvas();
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this._container.appendChild(this._canvas);
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}
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public dispose(): void {
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removeElementFromParent(this._canvas);
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this._charAtlas?.dispose();
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}
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private _initCanvas(): void {
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this._ctx = throwIfFalsy(this._canvas.getContext('2d', { alpha: this._alpha }));
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// Draw the background if this is an opaque layer
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if (!this._alpha) {
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this._clearAll();
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}
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}
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public onOptionsChanged(): void {}
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public onBlur(): void {}
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public onFocus(): void {}
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public onCursorMove(): void {}
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public onGridChanged(startRow: number, endRow: number): void {}
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public onSelectionChanged(start: [number, number] | undefined, end: [number, number] | undefined, columnSelectMode: boolean = false): void {
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this._selectionStart = start;
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this._selectionEnd = end;
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this._columnSelectMode = columnSelectMode;
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}
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public setColors(colorSet: IColorSet): void {
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this._refreshCharAtlas(colorSet);
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}
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protected _setTransparency(alpha: boolean): void {
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// Do nothing when alpha doesn't change
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if (alpha === this._alpha) {
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return;
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}
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// Create new canvas and replace old one
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const oldCanvas = this._canvas;
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this._alpha = alpha;
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// Cloning preserves properties
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this._canvas = this._canvas.cloneNode() as HTMLCanvasElement;
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this._initCanvas();
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this._container.replaceChild(this._canvas, oldCanvas);
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// Regenerate char atlas and force a full redraw
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this._refreshCharAtlas(this._colors);
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this.onGridChanged(0, this._bufferService.rows - 1);
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}
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/**
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* Refreshes the char atlas, aquiring a new one if necessary.
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* @param colorSet The color set to use for the char atlas.
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*/
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private _refreshCharAtlas(colorSet: IColorSet): void {
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if (this._scaledCharWidth <= 0 && this._scaledCharHeight <= 0) {
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return;
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}
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this._charAtlas = acquireCharAtlas(this._optionsService.rawOptions, this._rendererId, colorSet, this._scaledCharWidth, this._scaledCharHeight);
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this._charAtlas.warmUp();
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}
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public resize(dim: IRenderDimensions): void {
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this._scaledCellWidth = dim.scaledCellWidth;
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this._scaledCellHeight = dim.scaledCellHeight;
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this._scaledCharWidth = dim.scaledCharWidth;
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this._scaledCharHeight = dim.scaledCharHeight;
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this._scaledCharLeft = dim.scaledCharLeft;
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this._scaledCharTop = dim.scaledCharTop;
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this._canvas.width = dim.scaledCanvasWidth;
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this._canvas.height = dim.scaledCanvasHeight;
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this._canvas.style.width = `${dim.canvasWidth}px`;
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this._canvas.style.height = `${dim.canvasHeight}px`;
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// Draw the background if this is an opaque layer
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if (!this._alpha) {
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this._clearAll();
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}
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this._refreshCharAtlas(this._colors);
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}
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public abstract reset(): void;
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public clearTextureAtlas(): void {
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this._charAtlas?.clear();
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}
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/**
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* Fills 1+ cells completely. This uses the existing fillStyle on the context.
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* @param x The column to start at.
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* @param y The row to start at
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* @param width The number of columns to fill.
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* @param height The number of rows to fill.
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*/
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protected _fillCells(x: number, y: number, width: number, height: number): void {
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this._ctx.fillRect(
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x * this._scaledCellWidth,
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y * this._scaledCellHeight,
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width * this._scaledCellWidth,
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height * this._scaledCellHeight);
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}
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/**
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* Fills a 1px line (2px on HDPI) at the middle of the cell. This uses the
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* existing fillStyle on the context.
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* @param x The column to fill.
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* @param y The row to fill.
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*/
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protected _fillMiddleLineAtCells(x: number, y: number, width: number = 1): void {
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const cellOffset = Math.ceil(this._scaledCellHeight * 0.5);
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this._ctx.fillRect(
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x * this._scaledCellWidth,
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(y + 1) * this._scaledCellHeight - cellOffset - window.devicePixelRatio,
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width * this._scaledCellWidth,
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window.devicePixelRatio);
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}
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/**
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* Fills a 1px line (2px on HDPI) at the bottom of the cell. This uses the
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* existing fillStyle on the context.
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* @param x The column to fill.
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* @param y The row to fill.
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*/
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protected _fillBottomLineAtCells(x: number, y: number, width: number = 1): void {
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this._ctx.fillRect(
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x * this._scaledCellWidth,
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(y + 1) * this._scaledCellHeight - window.devicePixelRatio - 1 /* Ensure it's drawn within the cell */,
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width * this._scaledCellWidth,
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window.devicePixelRatio);
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}
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/**
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* Fills a 1px line (2px on HDPI) at the left of the cell. This uses the
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* existing fillStyle on the context.
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* @param x The column to fill.
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* @param y The row to fill.
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*/
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protected _fillLeftLineAtCell(x: number, y: number, width: number): void {
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this._ctx.fillRect(
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x * this._scaledCellWidth,
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y * this._scaledCellHeight,
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window.devicePixelRatio * width,
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this._scaledCellHeight);
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}
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/**
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* Strokes a 1px rectangle (2px on HDPI) around a cell. This uses the existing
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* strokeStyle on the context.
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* @param x The column to fill.
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* @param y The row to fill.
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*/
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protected _strokeRectAtCell(x: number, y: number, width: number, height: number): void {
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this._ctx.lineWidth = window.devicePixelRatio;
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this._ctx.strokeRect(
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x * this._scaledCellWidth + window.devicePixelRatio / 2,
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y * this._scaledCellHeight + (window.devicePixelRatio / 2),
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width * this._scaledCellWidth - window.devicePixelRatio,
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(height * this._scaledCellHeight) - window.devicePixelRatio);
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}
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/**
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* Clears the entire canvas.
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*/
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protected _clearAll(): void {
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if (this._alpha) {
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this._ctx.clearRect(0, 0, this._canvas.width, this._canvas.height);
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} else {
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this._ctx.fillStyle = this._colors.background.css;
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this._ctx.fillRect(0, 0, this._canvas.width, this._canvas.height);
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}
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}
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/**
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* Clears 1+ cells completely.
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* @param x The column to start at.
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||||
* @param y The row to start at.
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||||
* @param width The number of columns to clear.
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||||
* @param height The number of rows to clear.
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*/
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protected _clearCells(x: number, y: number, width: number, height: number): void {
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if (this._alpha) {
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this._ctx.clearRect(
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x * this._scaledCellWidth,
|
||||
y * this._scaledCellHeight,
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width * this._scaledCellWidth,
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height * this._scaledCellHeight);
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||||
} else {
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||||
this._ctx.fillStyle = this._colors.background.css;
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||||
this._ctx.fillRect(
|
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x * this._scaledCellWidth,
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y * this._scaledCellHeight,
|
||||
width * this._scaledCellWidth,
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||||
height * this._scaledCellHeight);
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||||
}
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}
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/**
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* Draws a truecolor character at the cell. The character will be clipped to
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||||
* ensure that it fits with the cell, including the cell to the right if it's
|
||||
* a wide character. This uses the existing fillStyle on the context.
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||||
* @param cell The cell data for the character to draw.
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||||
* @param x The column to draw at.
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||||
* @param y The row to draw at.
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||||
* @param color The color of the character.
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||||
*/
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||||
protected _fillCharTrueColor(cell: CellData, x: number, y: number): void {
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||||
this._ctx.font = this._getFont(false, false);
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||||
this._ctx.textBaseline = TEXT_BASELINE;
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this._clipRow(y);
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// Draw custom characters if applicable
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let drawSuccess = false;
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if (this._optionsService.rawOptions.customGlyphs !== false) {
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||||
drawSuccess = tryDrawCustomChar(this._ctx, cell.getChars(), x * this._scaledCellWidth, y * this._scaledCellHeight, this._scaledCellWidth, this._scaledCellHeight);
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||||
}
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||||
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||||
// Draw the character
|
||||
if (!drawSuccess) {
|
||||
this._ctx.fillText(
|
||||
cell.getChars(),
|
||||
x * this._scaledCellWidth + this._scaledCharLeft,
|
||||
y * this._scaledCellHeight + this._scaledCharTop + this._scaledCharHeight);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Draws one or more characters at a cell. If possible this will draw using
|
||||
* the character atlas to reduce draw time.
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||||
* @param chars The character or characters.
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||||
* @param code The character code.
|
||||
* @param width The width of the characters.
|
||||
* @param x The column to draw at.
|
||||
* @param y The row to draw at.
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||||
* @param fg The foreground color, in the format stored within the attributes.
|
||||
* @param bg The background color, in the format stored within the attributes.
|
||||
* This is used to validate whether a cached image can be used.
|
||||
* @param bold Whether the text is bold.
|
||||
*/
|
||||
protected _drawChars(cell: ICellData, x: number, y: number): void {
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||||
const contrastColor = this._getContrastColor(cell, x, y);
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||||
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||||
// skip cache right away if we draw in RGB
|
||||
// Note: to avoid bad runtime JoinedCellData will be skipped
|
||||
// in the cache handler itself (atlasDidDraw == false) and
|
||||
// fall through to uncached later down below
|
||||
if (contrastColor || cell.isFgRGB() || cell.isBgRGB()) {
|
||||
this._drawUncachedChars(cell, x, y, contrastColor);
|
||||
return;
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||||
}
|
||||
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||||
let fg;
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||||
let bg;
|
||||
if (cell.isInverse()) {
|
||||
fg = (cell.isBgDefault()) ? INVERTED_DEFAULT_COLOR : cell.getBgColor();
|
||||
bg = (cell.isFgDefault()) ? INVERTED_DEFAULT_COLOR : cell.getFgColor();
|
||||
} else {
|
||||
bg = (cell.isBgDefault()) ? DEFAULT_COLOR : cell.getBgColor();
|
||||
fg = (cell.isFgDefault()) ? DEFAULT_COLOR : cell.getFgColor();
|
||||
}
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||||
|
||||
const drawInBrightColor = this._optionsService.rawOptions.drawBoldTextInBrightColors && cell.isBold() && fg < 8;
|
||||
|
||||
fg += drawInBrightColor ? 8 : 0;
|
||||
this._currentGlyphIdentifier.chars = cell.getChars() || WHITESPACE_CELL_CHAR;
|
||||
this._currentGlyphIdentifier.code = cell.getCode() || WHITESPACE_CELL_CODE;
|
||||
this._currentGlyphIdentifier.bg = bg;
|
||||
this._currentGlyphIdentifier.fg = fg;
|
||||
this._currentGlyphIdentifier.bold = !!cell.isBold();
|
||||
this._currentGlyphIdentifier.dim = !!cell.isDim();
|
||||
this._currentGlyphIdentifier.italic = !!cell.isItalic();
|
||||
|
||||
// Don't try cache the glyph if it uses any decoration foreground/background override.
|
||||
let hasOverrides = false;
|
||||
for (const d of this._decorationService.getDecorationsAtCell(x, y)) {
|
||||
if (d.backgroundColorRGB || d.foregroundColorRGB) {
|
||||
hasOverrides = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
const atlasDidDraw = hasOverrides ? false : this._charAtlas?.draw(this._ctx, this._currentGlyphIdentifier, x * this._scaledCellWidth + this._scaledCharLeft, y * this._scaledCellHeight + this._scaledCharTop);
|
||||
|
||||
if (!atlasDidDraw) {
|
||||
this._drawUncachedChars(cell, x, y);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Draws one or more characters at one or more cells. The character(s) will be
|
||||
* clipped to ensure that they fit with the cell(s), including the cell to the
|
||||
* right if the last character is a wide character.
|
||||
* @param chars The character.
|
||||
* @param width The width of the character.
|
||||
* @param fg The foreground color, in the format stored within the attributes.
|
||||
* @param x The column to draw at.
|
||||
* @param y The row to draw at.
|
||||
*/
|
||||
private _drawUncachedChars(cell: ICellData, x: number, y: number, fgOverride?: IColor): void {
|
||||
this._ctx.save();
|
||||
this._ctx.font = this._getFont(!!cell.isBold(), !!cell.isItalic());
|
||||
this._ctx.textBaseline = TEXT_BASELINE;
|
||||
|
||||
if (cell.isInverse()) {
|
||||
if (fgOverride) {
|
||||
this._ctx.fillStyle = fgOverride.css;
|
||||
} else if (cell.isBgDefault()) {
|
||||
this._ctx.fillStyle = color.opaque(this._colors.background).css;
|
||||
} else if (cell.isBgRGB()) {
|
||||
this._ctx.fillStyle = `rgb(${AttributeData.toColorRGB(cell.getBgColor()).join(',')})`;
|
||||
} else {
|
||||
let bg = cell.getBgColor();
|
||||
if (this._optionsService.rawOptions.drawBoldTextInBrightColors && cell.isBold() && bg < 8) {
|
||||
bg += 8;
|
||||
}
|
||||
this._ctx.fillStyle = this._colors.ansi[bg].css;
|
||||
}
|
||||
} else {
|
||||
if (fgOverride) {
|
||||
this._ctx.fillStyle = fgOverride.css;
|
||||
} else if (cell.isFgDefault()) {
|
||||
this._ctx.fillStyle = this._colors.foreground.css;
|
||||
} else if (cell.isFgRGB()) {
|
||||
this._ctx.fillStyle = `rgb(${AttributeData.toColorRGB(cell.getFgColor()).join(',')})`;
|
||||
} else {
|
||||
let fg = cell.getFgColor();
|
||||
if (this._optionsService.rawOptions.drawBoldTextInBrightColors && cell.isBold() && fg < 8) {
|
||||
fg += 8;
|
||||
}
|
||||
this._ctx.fillStyle = this._colors.ansi[fg].css;
|
||||
}
|
||||
}
|
||||
|
||||
this._clipRow(y);
|
||||
|
||||
// Apply alpha to dim the character
|
||||
if (cell.isDim()) {
|
||||
this._ctx.globalAlpha = DIM_OPACITY;
|
||||
}
|
||||
|
||||
// Draw custom characters if applicable
|
||||
let drawSuccess = false;
|
||||
if (this._optionsService.rawOptions.customGlyphs !== false) {
|
||||
drawSuccess = tryDrawCustomChar(this._ctx, cell.getChars(), x * this._scaledCellWidth, y * this._scaledCellHeight, this._scaledCellWidth, this._scaledCellHeight);
|
||||
}
|
||||
|
||||
// Draw the character
|
||||
if (!drawSuccess) {
|
||||
this._ctx.fillText(
|
||||
cell.getChars(),
|
||||
x * this._scaledCellWidth + this._scaledCharLeft,
|
||||
y * this._scaledCellHeight + this._scaledCharTop + this._scaledCharHeight);
|
||||
}
|
||||
|
||||
this._ctx.restore();
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Clips a row to ensure no pixels will be drawn outside the cells in the row.
|
||||
* @param y The row to clip.
|
||||
*/
|
||||
private _clipRow(y: number): void {
|
||||
this._ctx.beginPath();
|
||||
this._ctx.rect(
|
||||
0,
|
||||
y * this._scaledCellHeight,
|
||||
this._bufferService.cols * this._scaledCellWidth,
|
||||
this._scaledCellHeight);
|
||||
this._ctx.clip();
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the current font.
|
||||
* @param isBold If we should use the bold fontWeight.
|
||||
*/
|
||||
protected _getFont(isBold: boolean, isItalic: boolean): string {
|
||||
const fontWeight = isBold ? this._optionsService.rawOptions.fontWeightBold : this._optionsService.rawOptions.fontWeight;
|
||||
const fontStyle = isItalic ? 'italic' : '';
|
||||
|
||||
return `${fontStyle} ${fontWeight} ${this._optionsService.rawOptions.fontSize * window.devicePixelRatio}px ${this._optionsService.rawOptions.fontFamily}`;
|
||||
}
|
||||
|
||||
private _getContrastColor(cell: CellData, x: number, y: number): IColor | undefined {
|
||||
// Get any decoration foreground/background overrides, this must be fetched before the early
|
||||
// exist but applied after inverse
|
||||
let bgOverride: number | undefined;
|
||||
let fgOverride: number | undefined;
|
||||
let isTop = false;
|
||||
for (const d of this._decorationService.getDecorationsAtCell(x, y)) {
|
||||
if (d.options.layer !== 'top' && isTop) {
|
||||
continue;
|
||||
}
|
||||
if (d.backgroundColorRGB) {
|
||||
bgOverride = d.backgroundColorRGB.rgba;
|
||||
}
|
||||
if (d.foregroundColorRGB) {
|
||||
fgOverride = d.foregroundColorRGB.rgba;
|
||||
}
|
||||
isTop = d.options.layer === 'top';
|
||||
}
|
||||
|
||||
// Apply selection foreground if applicable
|
||||
if (!isTop) {
|
||||
if (this._colors.selectionForeground && this._isCellInSelection(x, y)) {
|
||||
fgOverride = this._colors.selectionForeground.rgba;
|
||||
}
|
||||
}
|
||||
|
||||
if (!bgOverride && !fgOverride && (this._optionsService.rawOptions.minimumContrastRatio === 1 || excludeFromContrastRatioDemands(cell.getCode()))) {
|
||||
return undefined;
|
||||
}
|
||||
|
||||
if (!bgOverride && !fgOverride) {
|
||||
// Try get from cache
|
||||
const adjustedColor = this._colors.contrastCache.getColor(cell.bg, cell.fg);
|
||||
if (adjustedColor !== undefined) {
|
||||
return adjustedColor || undefined;
|
||||
}
|
||||
}
|
||||
|
||||
let fgColor = cell.getFgColor();
|
||||
let fgColorMode = cell.getFgColorMode();
|
||||
let bgColor = cell.getBgColor();
|
||||
let bgColorMode = cell.getBgColorMode();
|
||||
const isInverse = !!cell.isInverse();
|
||||
const isBold = !!cell.isInverse();
|
||||
if (isInverse) {
|
||||
const temp = fgColor;
|
||||
fgColor = bgColor;
|
||||
bgColor = temp;
|
||||
const temp2 = fgColorMode;
|
||||
fgColorMode = bgColorMode;
|
||||
bgColorMode = temp2;
|
||||
}
|
||||
|
||||
const bgRgba = this._resolveBackgroundRgba(bgOverride !== undefined ? Attributes.CM_RGB : bgColorMode, bgOverride ?? bgColor, isInverse);
|
||||
const fgRgba = this._resolveForegroundRgba(fgColorMode, fgColor, isInverse, isBold);
|
||||
let result = rgba.ensureContrastRatio(bgOverride ?? bgRgba, fgOverride ?? fgRgba, this._optionsService.rawOptions.minimumContrastRatio);
|
||||
|
||||
if (!result) {
|
||||
if (!fgOverride) {
|
||||
this._colors.contrastCache.setColor(cell.bg, cell.fg, null);
|
||||
return undefined;
|
||||
}
|
||||
// If it was an override and there was no contrast change, set as the result
|
||||
result = fgOverride;
|
||||
}
|
||||
|
||||
const color: IColor = {
|
||||
css: channels.toCss(
|
||||
(result >> 24) & 0xFF,
|
||||
(result >> 16) & 0xFF,
|
||||
(result >> 8) & 0xFF
|
||||
),
|
||||
rgba: result
|
||||
};
|
||||
if (!bgOverride && !fgOverride) {
|
||||
this._colors.contrastCache.setColor(cell.bg, cell.fg, color);
|
||||
}
|
||||
|
||||
return color;
|
||||
}
|
||||
|
||||
private _resolveBackgroundRgba(bgColorMode: number, bgColor: number, inverse: boolean): number {
|
||||
switch (bgColorMode) {
|
||||
case Attributes.CM_P16:
|
||||
case Attributes.CM_P256:
|
||||
return this._colors.ansi[bgColor].rgba;
|
||||
case Attributes.CM_RGB:
|
||||
return bgColor << 8;
|
||||
case Attributes.CM_DEFAULT:
|
||||
default:
|
||||
if (inverse) {
|
||||
return this._colors.foreground.rgba;
|
||||
}
|
||||
return this._colors.background.rgba;
|
||||
}
|
||||
}
|
||||
|
||||
private _resolveForegroundRgba(fgColorMode: number, fgColor: number, inverse: boolean, bold: boolean): number {
|
||||
switch (fgColorMode) {
|
||||
case Attributes.CM_P16:
|
||||
case Attributes.CM_P256:
|
||||
if (this._optionsService.rawOptions.drawBoldTextInBrightColors && bold && fgColor < 8) {
|
||||
fgColor += 8;
|
||||
}
|
||||
return this._colors.ansi[fgColor].rgba;
|
||||
case Attributes.CM_RGB:
|
||||
return fgColor << 8;
|
||||
case Attributes.CM_DEFAULT:
|
||||
default:
|
||||
if (inverse) {
|
||||
return this._colors.background.rgba;
|
||||
}
|
||||
return this._colors.foreground.rgba;
|
||||
}
|
||||
}
|
||||
|
||||
private _isCellInSelection(x: number, y: number): boolean {
|
||||
const start = this._selectionStart;
|
||||
const end = this._selectionEnd;
|
||||
if (!start || !end) {
|
||||
return false;
|
||||
}
|
||||
if (this._columnSelectMode) {
|
||||
return x >= start[0] && y >= start[1] &&
|
||||
x < end[0] && y < end[1];
|
||||
}
|
||||
return (y > start[1] && y < end[1]) ||
|
||||
(start[1] === end[1] && y === start[1] && x >= start[0] && x < end[0]) ||
|
||||
(start[1] < end[1] && y === end[1] && x < end[0]) ||
|
||||
(start[1] < end[1] && y === start[1] && x >= start[0]);
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user