ESPTerm web interface submodule, separated to make testing and development easier
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espterm-front-end/js/term/debug_screen.js

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const { mk } = require('../utils')
module.exports = function attachDebugScreen (screen) {
const debugCanvas = mk('canvas')
const ctx = debugCanvas.getContext('2d')
debugCanvas.style.position = 'absolute'
// hackity hack should probably set this in CSS
debugCanvas.style.top = '6px'
debugCanvas.style.left = '6px'
debugCanvas.style.pointerEvents = 'none'
let addCanvas = function () {
if (!debugCanvas.parentNode) screen.canvas.parentNode.appendChild(debugCanvas)
}
let removeCanvas = function () {
if (debugCanvas.parentNode) debugCanvas.parentNode.removeChild(debugCanvas)
}
let updateCanvasSize = function () {
let { width, height, devicePixelRatio } = screen.window
let cellSize = screen.getCellSize()
debugCanvas.width = width * cellSize.width * devicePixelRatio
debugCanvas.height = height * cellSize.height * devicePixelRatio
debugCanvas.style.width = `${width * cellSize.width}px`
debugCanvas.style.height = `${height * cellSize.height}px`
}
let startTime, endTime, lastReason
let cells = new Map()
let clippedRects = []
let startDrawing
screen._debug = {
drawStart (reason) {
lastReason = reason
startTime = Date.now()
clippedRects = []
},
drawEnd () {
endTime = Date.now()
console.log(`Draw: ${lastReason} (${(endTime - startTime)} ms) with fancy graphics: ${screen.window.graphics}`)
startDrawing()
},
setCell (cell, flags) {
cells.set(cell, [flags, Date.now()])
},
clipRect (...args) {
clippedRects.push(args)
}
}
let clipPattern
{
let patternCanvas = document.createElement('canvas')
patternCanvas.width = patternCanvas.height = 12
let pctx = patternCanvas.getContext('2d')
pctx.lineWidth = 1
pctx.strokeStyle = '#00f'
pctx.beginPath()
pctx.moveTo(0, 0)
pctx.lineTo(0 - 4, 12)
pctx.moveTo(4, 0)
pctx.lineTo(4 - 4, 12)
pctx.moveTo(8, 0)
pctx.lineTo(8 - 4, 12)
pctx.moveTo(12, 0)
pctx.lineTo(12 - 4, 12)
pctx.moveTo(16, 0)
pctx.lineTo(16 - 4, 12)
pctx.stroke()
clipPattern = ctx.createPattern(patternCanvas, 'repeat')
}
let isDrawing = false
let drawLoop = function () {
if (isDrawing) window.requestAnimationFrame(drawLoop)
let { devicePixelRatio, width, height } = screen.window
let { width: cellWidth, height: cellHeight } = screen.getCellSize()
let screenLength = width * height
let now = Date.now()
ctx.setTransform(devicePixelRatio, 0, 0, devicePixelRatio, 0, 0)
ctx.clearRect(0, 0, width * cellWidth, height * cellHeight)
let activeCells = 0
for (let cell = 0; cell < screenLength; cell++) {
if (!cells.has(cell) || cells.get(cell)[0] === 0) continue
let [flags, timestamp] = cells.get(cell)
let elapsedTime = (now - timestamp) / 1000
if (elapsedTime > 1) continue
activeCells++
ctx.globalAlpha = 0.5 * Math.max(0, 1 - elapsedTime)
let x = cell % width
let y = Math.floor(cell / width)
if (flags & 1) {
// redrawn
ctx.fillStyle = '#f0f'
}
if (flags & 2) {
// updated
ctx.fillStyle = '#0f0'
}
ctx.fillRect(x * cellWidth, y * cellHeight, cellWidth, cellHeight)
if (flags & 4) {
// wide cell
ctx.lineWidth = 2
ctx.strokeStyle = '#f00'
ctx.strokeRect(x * cellWidth, y * cellHeight, cellWidth, cellHeight)
}
}
if (clippedRects.length) {
ctx.globalAlpha = 0.5
ctx.beginPath()
for (let rect of clippedRects) {
ctx.rect(...rect)
}
ctx.fillStyle = clipPattern
ctx.fill()
}
if (activeCells === 0) {
isDrawing = false
removeCanvas()
}
}
startDrawing = function () {
if (isDrawing) return
addCanvas()
updateCanvasSize()
isDrawing = true
drawLoop()
}
// debug toolbar
const toolbar = mk('div')
toolbar.classList.add('debug-toolbar')
let toolbarAttached = false
const attachToolbar = function () {
screen.canvas.parentNode.appendChild(toolbar)
}
const detachToolbar = function () {
toolbar.parentNode.removeChild(toolbar)
}
screen.on('update-window:debug', debug => {
if (debug !== toolbarAttached) {
toolbarAttached = debug
if (debug) attachToolbar()
else detachToolbar()
}
})
screen.on('draw', () => {
if (!toolbarAttached) return
let cursorCell = screen.cursor.y * screen.window.width + screen.cursor.x
let cellFG = screen.screenFG[cursorCell]
let cellBG = screen.screenBG[cursorCell]
let cellCode = (screen.screen[cursorCell] || '').codePointAt(0)
let cellAttrs = screen.screenAttrs[cursorCell]
let hexcode = cellCode.toString(16).toUpperCase()
if (hexcode.length < 4) hexcode = `0000${hexcode}`.substr(-4)
hexcode = `U+${hexcode}`
toolbar.textContent = `Cursor cell (${cursorCell}): ${hexcode} FG: ${cellFG} BG: ${cellBG} Attrs: ${cellAttrs.toString(2)}`
})
}