Do padding in canvas instead of CSS

js/term/screen.js

@@ -55,6 +55,7 @@ module.exports = class TermScreen extends EventEmitter {
       devicePixelRatio: 1,
       fontFamily: '"DejaVu Sans Mono", "Liberation Mono", "Inconsolata", "Menlo", monospace',
       fontSize: 20,
+      padding: 6,
       gridScaleX: 1.0,
       gridScaleY: 1.2,
       fitIntoWidth: 0,
@@ -67,11 +68,15 @@ module.exports = class TermScreen extends EventEmitter {
     // scaling caused by fitIntoWidth/fitIntoHeight
     this._windowScale = 1
 
+    // actual padding, as it may be disabled by fullscreen mode etc.
+    this._padding = 0
+
     // properties of this.window that require updating size and redrawing
     this.windowState = {
       width: 0,
       height: 0,
       devicePixelRatio: 0,
+      padding: 0,
       gridScaleX: 0,
       gridScaleY: 0,
       fontFamily: '',
@@ -313,8 +318,8 @@ module.exports = class TermScreen extends EventEmitter {
     let cellSize = this.getCellSize()
 
     return [
-      Math.floor((x + (rounded ? cellSize.width / 2 : 0)) / cellSize.width),
-      Math.floor(y / cellSize.height)
+      Math.floor((x - this._padding + (rounded ? cellSize.width / 2 : 0)) / cellSize.width),
+      Math.floor((y - this._padding) / cellSize.height)
     ]
   }
 
@@ -328,7 +333,7 @@ module.exports = class TermScreen extends EventEmitter {
   gridToScreen (x, y, withScale = false) {
     let cellSize = this.getCellSize()
 
-    return [x * cellSize.width, y * cellSize.height].map(v => withScale ? v * this._windowScale : v)
+    return [x * cellSize.width, y * cellSize.height].map(v => this._padding + (withScale ? v * this._windowScale : v))
   }
 
   /**
@@ -378,13 +383,14 @@ module.exports = class TermScreen extends EventEmitter {
         width,
         height,
         fitIntoWidth,
-        fitIntoHeight
+        fitIntoHeight,
+        padding
       } = this.window
       const cellSize = this.getCellSize()
 
       // real height of the canvas element in pixels
-      let realWidth = width * cellSize.width
-      let realHeight = height * cellSize.height
+      let realWidth = width * cellSize.width + 2 * padding
+      let realHeight = height * cellSize.height + 2 * padding
 
       if (fitIntoWidth && fitIntoHeight) {
         let terminalAspect = realWidth / realHeight
@@ -409,13 +415,16 @@ module.exports = class TermScreen extends EventEmitter {
 
       // store new window scale
       this._windowScale = realWidth / (width * cellSize.width)
+      // and padding
+      // TODO: disable in fullscreen mode
+      this._padding = padding
 
       // the DPR must be rounded to a very nice value to prevent gaps between cells
       let devicePixelRatio = this._window.devicePixelRatio = Math.round(this._windowScale * (window.devicePixelRatio || 1) * 2) / 2
 
-      this.canvas.width = width * devicePixelRatio * cellSize.width
+      this.canvas.width = (width * cellSize.width + 2 * padding) * devicePixelRatio
       this.canvas.style.width = `${realWidth}px`
-      this.canvas.height = height * devicePixelRatio * cellSize.height
+      this.canvas.height = (height * cellSize.height + 2 * padding) * devicePixelRatio
       this.canvas.style.height = `${realHeight}px`
 
       // the screen has been cleared (by changing canvas width)

js/term/screen_renderer.js

@@ -159,9 +159,26 @@ module.exports = class ScreenRenderer {
    */
   drawBackground ({ x, y, cellWidth, cellHeight, bg }) {
     const ctx = this.ctx
+    const { width, height } = this.screen.window
     ctx.fillStyle = this.getColor(bg)
-    ctx.clearRect(x * cellWidth, y * cellHeight, cellWidth, cellHeight)
-    ctx.fillRect(x * cellWidth, y * cellHeight, cellWidth, cellHeight)
+    let screenX = x * cellWidth + this.screen._padding
+    let screenY = y * cellHeight + this.screen._padding
+    let isBorderCell = x === 0 || y === 0 || x === width - 1 || y === height - 1
+    if (isBorderCell) {
+      let left = screenX
+      let top = screenY
+      let right = screenX + cellWidth
+      let bottom = screenY + cellHeight
+      if (x === 0) left -= this.screen._padding
+      else if (x === width - 1) right += this.screen._padding
+      if (y === 0) top -= this.screen._padding
+      else if (y === height - 1) bottom += this.screen._padding
+      ctx.clearRect(left, top, right - left, bottom - top)
+      ctx.fillRect(left, top, right - left, bottom - top)
+    } else {
+      ctx.clearRect(screenX, screenY, cellWidth, cellHeight)
+      ctx.fillRect(screenX, screenY, cellWidth, cellHeight)
+    }
   }
 
   /**
@@ -194,12 +211,15 @@ module.exports = class ScreenRenderer {
 
     ctx.fillStyle = this.getColor(fg)
 
+    let screenX = x * cellWidth + this.screen._padding
+    let screenY = y * cellHeight + this.screen._padding
+
     let codePoint = text.codePointAt(0)
     if (codePoint >= 0x2580 && codePoint <= 0x259F) {
       // block elements
       ctx.beginPath()
-      const left = x * cellWidth
-      const top = y * cellHeight
+      const left = screenX
+      const top = screenY
       const cw = cellWidth
       const ch = cellHeight
       const c2w = cellWidth / 2
@@ -251,16 +271,16 @@ module.exports = class ScreenRenderer {
           for (let dx = 0; dx < cw; dx += dotSpacingX) {
             // prevent overflow
             let dotSizeY = Math.min(dotSize, ch - dy)
-            ctx.rect(x * cw + (alignRight ? cw - dx - dotSize : dx), y * ch + dy, dotSize, dotSizeY)
+            ctx.rect(left + (alignRight ? cw - dx - dotSize : dx), top + dy, dotSize, dotSizeY)
           }
           alignRight = !alignRight
         }
       } else if (codePoint === 0x2594) {
         // upper one eighth block >▔<
-        ctx.rect(x * cw, y * ch, cw, ch / 8)
+        ctx.rect(left, top, cw, ch / 8)
       } else if (codePoint === 0x2595) {
         // right one eighth block >▕<
-        ctx.rect((x + 7 / 8) * cw, y * ch, cw / 8, ch)
+        ctx.rect(left + (7 / 8) * cw, top, cw / 8, ch)
       } else if (codePoint === 0x2596) {
         // left bottom quadrant >▖<
         ctx.rect(left, top + c2h, c2w, c2h)
@@ -302,7 +322,7 @@ module.exports = class ScreenRenderer {
       ctx.fill()
     } else {
       // Draw other characters using the text renderer
-      ctx.fillText(text, (x + 0.5) * cellWidth, (y + 0.5) * cellHeight)
+      ctx.fillText(text, screenX + 0.5 * cellWidth, screenY + 0.5 * cellHeight)
     }
 
     // -- line drawing - a reference for a possible future rect/line implementation ---
@@ -324,21 +344,21 @@ module.exports = class ScreenRenderer {
       ctx.beginPath()
 
       if (underline) {
-        let lineY = Math.round(y * cellHeight + charSize.height) + 0.5
-        ctx.moveTo(x * cellWidth, lineY)
-        ctx.lineTo((x + 1) * cellWidth, lineY)
+        let lineY = Math.round(screenY + charSize.height) + 0.5
+        ctx.moveTo(screenX, lineY)
+        ctx.lineTo(screenX + cellWidth, lineY)
       }
 
       if (strike) {
-        let lineY = Math.round((y + 0.5) * cellHeight) + 0.5
-        ctx.moveTo(x * cellWidth, lineY)
-        ctx.lineTo((x + 1) * cellWidth, lineY)
+        let lineY = Math.round(screenY + 0.5 * cellHeight) + 0.5
+        ctx.moveTo(screenX, lineY)
+        ctx.lineTo(screenX + cellWidth, lineY)
       }
 
       if (overline) {
-        let lineY = Math.round(y * cellHeight) + 0.5
-        ctx.moveTo(x * cellWidth, lineY)
-        ctx.lineTo((x + 1) * cellWidth, lineY)
+        let lineY = Math.round(screenY) + 0.5
+        ctx.moveTo(screenX, lineY)
+        ctx.lineTo(screenX + cellWidth, lineY)
       }
 
       ctx.stroke()
@@ -570,17 +590,19 @@ module.exports = class ScreenRenderer {
           if (isCursor && !inSelection) {
             ctx.save()
             ctx.beginPath()
+            let screenX = x * cellWidth + this.screen._padding
+            let screenY = y * cellHeight + this.screen._padding
             if (this.screen.cursor.style === 'block') {
               // block
-              ctx.rect(x * cellWidth, y * cellHeight, cellWidth, cellHeight)
+              ctx.rect(screenX, screenY, cellWidth, cellHeight)
             } else if (this.screen.cursor.style === 'bar') {
               // vertical bar
               let barWidth = 2
-              ctx.rect(x * cellWidth, y * cellHeight, barWidth, cellHeight)
+              ctx.rect(screenX, screenY, barWidth, cellHeight)
             } else if (this.screen.cursor.style === 'line') {
               // underline
               let lineHeight = 2
-              ctx.rect(x * cellWidth, y * cellHeight + charSize.height, cellWidth, lineHeight)
+              ctx.rect(screenX, screenY + charSize.height, cellWidth, lineHeight)
             }
             ctx.clip()
 

sass/pages/_term.scss

@@ -18,7 +18,6 @@ body.term {
 #screen {
 	white-space: nowrap;
 	background: #111213;
-	padding: 6px;
 	display: inline-block;
 	border: 2px solid #3983CD;
 	position: relative;