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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| /** | ||
| * Copyright (c) 2017 The xterm.js authors. All rights reserved. | ||
| * @license MIT | ||
| */ | ||
|
|
||
| import { ITerminal } from '../../Types'; | ||
| import { | ||
| ICharAtlas, | ||
| ICharAtlasConfig, | ||
| IGlyphIdentifier, | ||
| generateConfig, | ||
| configEquals, | ||
| } from './CharAtlasUtils'; | ||
| import NoneCharAtlas from './NoneCharAtlas'; | ||
| import DynamicCharAtlas from './DynamicCharAtlas'; | ||
| import { IColorSet } from '../Types'; | ||
|
|
||
| const charAtlasImplementations = { | ||
| 'none': NoneCharAtlas, | ||
| 'static': NoneCharAtlas, // TODO: implement | ||
| 'dynamic': DynamicCharAtlas, | ||
| }; | ||
|
|
||
| interface ICharAtlasCacheEntry { | ||
| atlas: ICharAtlas; | ||
| config: ICharAtlasConfig; | ||
| // N.B. This implementation potentially holds onto copies of the terminal forever, so | ||
| // this may cause memory leaks. | ||
| ownedBy: ITerminal[]; | ||
| } | ||
|
|
||
| const charAtlasCache: ICharAtlasCacheEntry[] = []; | ||
|
|
||
| /** | ||
| * Acquires a char atlas, either generating a new one or returning an existing | ||
| * one that is in use by another terminal. | ||
| * | ||
| * @param terminal The terminal. | ||
| * @param colors The colors to use. | ||
| */ | ||
| export function acquireCharAtlas( | ||
| terminal: ITerminal, | ||
| colors: IColorSet, | ||
| scaledCharWidth: number, | ||
| scaledCharHeight: number, | ||
| ): ICharAtlas { | ||
| const newConfig = generateConfig(scaledCharWidth, scaledCharHeight, terminal, colors); | ||
|
|
||
| // Check to see if the terminal already owns this config | ||
| for (let i = 0; i < charAtlasCache.length; i++) { | ||
| const entry = charAtlasCache[i]; | ||
| const ownedByIndex = entry.ownedBy.indexOf(terminal); | ||
| if (ownedByIndex >= 0) { | ||
| if (configEquals(entry.config, newConfig)) { | ||
| return entry.atlas; | ||
| } else { | ||
| // The configs differ, release the terminal from the entry | ||
| if (entry.ownedBy.length === 1) { | ||
| charAtlasCache.splice(i, 1); | ||
| } else { | ||
| entry.ownedBy.splice(ownedByIndex, 1); | ||
| } | ||
| break; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Try match a char atlas from the cache | ||
| for (let i = 0; i < charAtlasCache.length; i++) { | ||
| const entry = charAtlasCache[i]; | ||
| if (configEquals(entry.config, newConfig)) { | ||
| // Add the terminal to the cache entry and return | ||
| entry.ownedBy.push(terminal); | ||
| return entry.atlas; | ||
| } | ||
| } | ||
|
|
||
| const newEntry: ICharAtlasCacheEntry = { | ||
| atlas: new charAtlasImplementations[terminal.options.experimentalCharAtlas]( | ||
| document, | ||
| newConfig, | ||
| ), | ||
| config: newConfig, | ||
| ownedBy: [terminal], | ||
| }; | ||
| charAtlasCache.push(newEntry); | ||
| return newEntry.atlas; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /** | ||
| * Copyright (c) 2017 The xterm.js authors. All rights reserved. | ||
| * @license MIT | ||
| */ | ||
|
|
||
| import { ITerminal } from '../../Types'; | ||
| import { ITheme } from 'xterm'; | ||
| import { IColorSet } from '../Types'; | ||
|
|
||
| export interface IGlyphIdentifier { | ||
| char: string; | ||
| bg: number; | ||
| fg: number; | ||
| bold: boolean; | ||
| dim: boolean; | ||
| } | ||
|
|
||
| export const CHAR_ATLAS_CELL_SPACING = 1; | ||
| export const INVERTED_DEFAULT_COLOR = -1; | ||
| export const DIM_OPACITY = 0.5; | ||
|
|
||
| export interface ICharAtlasConfig { | ||
| type: 'none' | 'static' | 'dynamic'; | ||
| devicePixelRatio: number; | ||
| fontSize: number; | ||
| fontFamily: string; | ||
| fontWeight: string; | ||
| fontWeightBold: string; | ||
| scaledCharWidth: number; | ||
| scaledCharHeight: number; | ||
| allowTransparency: boolean; | ||
| colors: IColorSet; | ||
| } | ||
|
|
||
| export interface ICharAtlas { | ||
| /** | ||
| * Perform any work needed to warm the cache before it can be used. | ||
| */ | ||
| warmUp(): Promise<any>; | ||
|
|
||
| /** | ||
| * May be called before warmUp finishes, however it is okay for the implementation to | ||
| * do nothing and return false in that case. | ||
| * | ||
| * @param ctx Where to draw the character onto. | ||
| * @param glyph Information about what to draw | ||
| * @param x The position on the context to start drawing at | ||
| * @param y The position on the context to start drawing at | ||
| * @returns The success state. True if we drew the character. | ||
| */ | ||
| draw( | ||
| ctx: CanvasRenderingContext2D, | ||
| glyph: IGlyphIdentifier, | ||
| x: number, | ||
| y: number | ||
| ): boolean; | ||
| } | ||
|
|
||
| export function generateConfig(scaledCharWidth: number, scaledCharHeight: number, terminal: ITerminal, colors: IColorSet): ICharAtlasConfig { | ||
| const clonedColors = { | ||
| foreground: colors.foreground, | ||
| background: colors.background, | ||
| cursor: null, | ||
| cursorAccent: null, | ||
| selection: null, | ||
| ansi: colors.ansi.slice(0, 16) | ||
| }; | ||
| return { | ||
| type: terminal.options.experimentalCharAtlas, | ||
| devicePixelRatio: window.devicePixelRatio, | ||
| scaledCharWidth, | ||
| scaledCharHeight, | ||
| fontFamily: terminal.options.fontFamily, | ||
| fontSize: terminal.options.fontSize, | ||
| fontWeight: terminal.options.fontWeight, | ||
| fontWeightBold: terminal.options.fontWeightBold, | ||
| allowTransparency: terminal.options.allowTransparency, | ||
| colors: clonedColors | ||
| }; | ||
| } | ||
|
|
||
| export function configEquals(a: ICharAtlasConfig, b: ICharAtlasConfig): boolean { | ||
| for (let i = 0; i < a.colors.ansi.length; i++) { | ||
| if (a.colors.ansi[i] !== b.colors.ansi[i]) { | ||
| return false; | ||
| } | ||
| } | ||
| return a.type === b.type && | ||
| a.devicePixelRatio === b.devicePixelRatio && | ||
| a.fontFamily === b.fontFamily && | ||
| a.fontSize === b.fontSize && | ||
| a.fontWeight === b.fontWeight && | ||
| a.fontWeightBold === b.fontWeightBold && | ||
| a.allowTransparency === b.allowTransparency && | ||
| a.scaledCharWidth === b.scaledCharWidth && | ||
| a.scaledCharHeight === b.scaledCharHeight && | ||
| a.colors.foreground === b.colors.foreground && | ||
| a.colors.background === b.colors.background; | ||
| } |
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