Custom common powerline glyph rendering

Fixes #3827

demo/client.ts

@@ -585,6 +585,32 @@ function powerlineSymbolTest() {
   term.writeln(`0xA_  ${s('\ue0a0')}${s('\ue0a1')}${s('\ue0a2')}`);
   term.writeln(`0xB_  ${s('\ue0b0')}${s('\ue0b1')}${s('\ue0b2')}${s('\ue0b3')}`);
   term.writeln('');
+  term.writeln(
+    `\x1b[7m` +
+    ` inverse \ue0b1 \x1b[0;40m\ue0b0` +
+    ` 0 \ue0b1 \x1b[30;41m\ue0b0\x1b[39m` +
+    ` 1 \ue0b1 \x1b[31;42m\ue0b0\x1b[39m` +
+    ` 2 \ue0b1 \x1b[32;43m\ue0b0\x1b[39m` +
+    ` 3 \ue0b1 \x1b[33;44m\ue0b0\x1b[39m` +
+    ` 4 \ue0b1 \x1b[34;45m\ue0b0\x1b[39m` +
+    ` 5 \ue0b1 \x1b[35;46m\ue0b0\x1b[39m` +
+    ` 6 \ue0b1 \x1b[36;47m\ue0b0\x1b[39m` +
+    ` 7 \ue0b1 \x1b[37;49m\ue0b0\x1b[0m`
+  );
+  term.writeln('');
+  term.writeln(
+    `\x1b[7m` +
+    ` inverse \ue0b3 \x1b[0;7;40m\ue0b2\x1b[27m` +
+    ` 0 \ue0b3 \x1b[7;30;41m\ue0b2\x1b[27;39m` +
+    ` 1 \ue0b3 \x1b[7;31;42m\ue0b2\x1b[27;39m` +
+    ` 2 \ue0b3 \x1b[7;32;43m\ue0b2\x1b[27;39m` +
+    ` 3 \ue0b3 \x1b[7;33;44m\ue0b2\x1b[27;39m` +
+    ` 4 \ue0b3 \x1b[7;34;45m\ue0b2\x1b[27;39m` +
+    ` 5 \ue0b3 \x1b[7;35;46m\ue0b2\x1b[27;39m` +
+    ` 6 \ue0b3 \x1b[7;36;47m\ue0b2\x1b[27;39m` +
+    ` 7 \ue0b3 \x1b[7;37;49m\ue0b2\x1b[0m`
+  );
+  term.writeln('');
   term.writeln('Powerline extra symbols:');
   term.writeln('      0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F');
   term.writeln(`0xA_                 ${s('\ue0a3')}`);

src/browser/renderer/CustomGlyphs.ts

@@ -325,6 +325,35 @@ export const boxDrawingDefinitions: { [character: string]: { [fontWeight: number
   '╰': { [Style.NORMAL]: 'C.5,0,.5,.5,1,.5' }
 };
 
+interface IVectorShape {
+  d: string;
+  type: VectorType;
+}
+
+const enum VectorType {
+  FILL,
+  STROKE
+}
+
+/**
+ * This contains the definitions of the primarily used box drawing characters as vector shapes. The
+ * reason these characters are defined specially is to avoid common problems if a user's font has
+ * not been patched with powerline characters and also to get pixel perfect rendering as rendering
+ * issues can occur around AA/SPAA.
+ *
+ * Original symbols defined in https://github.com/powerline/fontpatcher
+ */
+export const powerlineDefinitions: { [index: string]: IVectorShape } = {
+  // Right triangle solid
+  '\u{E0B0}': { d: 'M0,0 L1,.5 L0,1', type: VectorType.FILL },
+  // Right triangle line
+  '\u{E0B1}': { d: 'M0,0 L1,.5 L0,1', type: VectorType.STROKE },
+  // Left triangle solid
+  '\u{E0B2}': { d: 'M1,0 L0,.5 L1,1', type: VectorType.FILL },
+  // Left triangle line
+  '\u{E0B3}': { d: 'M1,0 L0,.5 L1,1', type: VectorType.STROKE }
+};
+
 /**
  * Try drawing a custom block element or box drawing character, returning whether it was
  * successfully drawn.
@@ -355,6 +384,12 @@ export function tryDrawCustomChar(
     return true;
   }
 
+  const powerlineDefinition = powerlineDefinitions[c];
+  if (powerlineDefinition) {
+    drawPowerlineChar(ctx, powerlineDefinition, xOffset, yOffset, scaledCellWidth, scaledCellHeight);
+    return true;
+  }
+
   return false;
 }
 
@@ -518,6 +553,38 @@ function drawBoxDrawingChar(
   }
 }
 
+function drawPowerlineChar(
+  ctx: CanvasRenderingContext2D,
+  charDefinition: IVectorShape,
+  xOffset: number,
+  yOffset: number,
+  scaledCellWidth: number,
+  scaledCellHeight: number
+): void {
+  ctx.beginPath();
+  ctx.lineWidth = window.devicePixelRatio;
+  for (const instruction of charDefinition.d.split(' ')) {
+    const type = instruction[0];
+    const f = svgToCanvasInstructionMap[type];
+    if (!f) {
+      console.error(`Could not find drawing instructions for "${type}"`);
+      continue;
+    }
+    const args: string[] = instruction.substring(1).split(',');
+    if (!args[0] || !args[1]) {
+      continue;
+    }
+    f(ctx, translateArgs(args, scaledCellWidth, scaledCellHeight, xOffset, yOffset));
+  }
+  if (charDefinition.type === VectorType.STROKE) {
+    ctx.strokeStyle = ctx.fillStyle;
+    ctx.stroke();
+  } else {
+    ctx.fill();
+  }
+  ctx.closePath();
+}
+
 function clamp(value: number, max: number, min: number = 0): number {
   return Math.max(Math.min(value, max), min);
 }