Fix invisible cursor with graphics=1

js/debug_screen.js

@@ -25,6 +25,7 @@ window.attachDebugScreen = function (screen) {
 
   let startTime, endTime, lastReason
   let cells = new Map()
+  let clippedRects = []
 
   let startDrawing
 
@@ -32,6 +33,7 @@ window.attachDebugScreen = function (screen) {
     drawStart (reason) {
       lastReason = reason
       startTime = Date.now()
+      clippedRects = []
     },
     drawEnd () {
       endTime = Date.now()
@@ -40,7 +42,32 @@ window.attachDebugScreen = function (screen) {
     },
     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
@@ -90,6 +117,18 @@ window.attachDebugScreen = function (screen) {
       }
     }
 
+    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()

js/term_screen.js

@@ -708,7 +708,7 @@ window.TermScreen = class TermScreen extends EventEmitter {
     let overline = false
     if (attrs & (1 << 1)) ctx.globalAlpha = 0.5
     if (attrs & (1 << 3)) underline = true
-    if (attrs & (1 << 5)) text = TermScreen.alphaToFraktur(text)
+    if (attrs & (1 << 5)) text = this.alphaToFraktur(text)
     if (attrs & (1 << 6)) strike = true
     if (attrs & (1 << 7)) overline = true
 
@@ -963,12 +963,12 @@ window.TermScreen = class TermScreen extends EventEmitter {
         bg = -2
       }
 
-      let didUpdate = text !== this.drawnScreen[cell] ||
+      let didUpdate = text !== this.drawnScreen[cell] || // text updated
-        fg !== this.drawnScreenFG[cell] ||
+        fg !== this.drawnScreenFG[cell] || // foreground updated, and this cell has text
-        bg !== this.drawnScreenBG[cell] ||
+        bg !== this.drawnScreenBG[cell] || // background updated
-        attrs !== this.drawnScreenAttrs[cell] ||
+        attrs !== this.drawnScreenAttrs[cell] || // attributes updated
-        isCursor !== wasCursor ||
+        isCursor !== wasCursor || // cursor blink/position updated
-        (isCursor && this.cursor.style !== this.drawnCursor[2])
+        (isCursor && this.cursor.style !== this.drawnCursor[2]) // cursor style updated
 
       let font = attrs & FONT_MASK
       if (!fontGroups.has(font)) fontGroups.set(font, [])
@@ -985,7 +985,7 @@ window.TermScreen = class TermScreen extends EventEmitter {
 
     // decide for each cell if it should be redrawn
     let updateRedrawMapAt = cell => {
-      let shouldUpdate = updateMap.get(cell) || redrawMap.get(cell)
+      let shouldUpdate = updateMap.get(cell) || redrawMap.get(cell) || false
 
       // TODO: fonts (necessary?)
       let text = this.screen[cell]
@@ -997,7 +997,10 @@ window.TermScreen = class TermScreen extends EventEmitter {
         let adjacentDidUpdate = false
 
         for (let adjacentCell of this.getAdjacentCells(cell, checkRadius)) {
-          if (updateMap.get(adjacentCell)) {
+          // update this cell if:
+          // - the adjacent cell updated (For now, this'll always be true because characters can be slightly larger than they say they are)
+          // - the adjacent cell updated and this cell or the adjacent cell is wide
+          if (updateMap.get(adjacentCell) && (this.window.graphics < 2 || isWideCell || isTextWide(this.screen[adjacentCell]))) {
             adjacentDidUpdate = true
             break
           }
@@ -1013,6 +1016,7 @@ window.TermScreen = class TermScreen extends EventEmitter {
 
     // mask to redrawing regions only
     if (this.window.graphics >= 1) {
+      let debug = this.window.debug && this._debug
       ctx.save()
       ctx.beginPath()
       for (let y = 0; y < height; y++) {
@@ -1023,11 +1027,13 @@ window.TermScreen = class TermScreen extends EventEmitter {
           if (redrawing && regionStart === null) regionStart = x
           if (!redrawing && regionStart !== null) {
             ctx.rect(regionStart * cellWidth, y * cellHeight, (x - regionStart) * cellWidth, cellHeight)
+            if (debug) this._debug.clipRect(regionStart * cellWidth, y * cellHeight, (x - regionStart) * cellWidth, cellHeight)
             regionStart = null
           }
         }
         if (regionStart !== null) {
           ctx.rect(regionStart * cellWidth, y * cellHeight, (width - regionStart) * cellWidth, cellHeight)
+          if (debug) this._debug.clipRect(regionStart * cellWidth, y * cellHeight, (width - regionStart) * cellWidth, cellHeight)
         }
       }
       ctx.clip()
@@ -1040,10 +1046,21 @@ window.TermScreen = class TermScreen extends EventEmitter {
 
         if (redrawMap.get(cell)) {
           this.drawCellBackground({ x, y, cellWidth, cellHeight, bg })
+
+          if (this.window.debug && this._debug) {
+            // set cell flags
+            let flags = (+redrawMap.get(cell))
+            flags |= (+updateMap.get(cell)) << 1
+            flags |= (+isTextWide(text)) << 2
+            this._debug.setCell(cell, flags)
+          }
         }
       }
     }
 
+    // reset drawn cursor
+    this.drawnCursor = [-1, -1, -1]
+
     // pass 2: characters
     for (let font of fontGroups.keys()) {
       // set font once because in Firefox, this is a really slow action for some
@@ -1068,15 +1085,6 @@ window.TermScreen = class TermScreen extends EventEmitter {
 
           if (isCursor) this.drawnCursor = [x, y, this.cursor.style]
 
-          if (this.window.debug && this._debug) {
-            // set cell flags
-            let flags = 1 // always redrawn
-            flags |= (+updateMap.get(cell)) << 1
-            flags |= (+isTextWide(text)) << 2
-            this._debug.setCell(cell, flags)
-          }
-        }
-
           if (isCursor && !inSelection) {
             ctx.save()
             ctx.beginPath()
@@ -1108,6 +1116,7 @@ window.TermScreen = class TermScreen extends EventEmitter {
           }
         }
       }
+    }
 
     if (this.window.graphics >= 1) ctx.restore()
 
@@ -1483,7 +1492,7 @@ window.TermScreen = class TermScreen extends EventEmitter {
    * @param {string} character - the character
    * @returns {string} the converted character
    */
-  static alphaToFraktur (character) {
+  alphaToFraktur (character) {
     if (character >= 'a' && character <= 'z') {
       character = String.fromCodePoint(0x1d51e - 0x61 + character.charCodeAt(0))
     } else if (character >= 'A' && character <= 'Z') {