Implement rescaleOverlappingGlyphs in webgl

Part of #4969

src/browser/renderer/shared/RendererUtils.ts

@@ -27,6 +27,19 @@ function isBoxOrBlockGlyph(codepoint: number): boolean {
   return 0x2500 <= codepoint && codepoint <= 0x259F;
 }
 
+export function isEmoji(codepoint: number): boolean {
+  return (
+    codepoint >= 0x1F600 && codepoint <= 0x1F64F || // Emoticons
+    codepoint >= 0x1F300 && codepoint <= 0x1F5FF ||  // Misc Symbols and Pictographs
+    codepoint >= 0x1F680 && codepoint <= 0x1F6FF ||  // Transport and Map
+    codepoint >= 0x2600 && codepoint <= 0x26FF ||    // Misc symbols
+    codepoint >= 0x2700 && codepoint <= 0x27BF ||    // Dingbats
+    codepoint >= 0xFE00 && codepoint <= 0xFE0F ||    // Variation Selectors
+    codepoint >= 0x1F900 && codepoint <= 0x1F9FF ||  // Supplemental Symbols and Pictographs
+    codepoint >= 0x1F1E6 && codepoint <= 0x1F1FF
+  );
+}
+
 export function treatGlyphAsBackgroundColor(codepoint: number): boolean {
   return isPowerlineGlyph(codepoint) || isBoxOrBlockGlyph(codepoint);
 }

src/browser/services/RenderService.ts

@@ -87,7 +87,8 @@ export class RenderService extends Disposable implements IRenderService {
       'fontSize',
       'fontWeight',
       'fontWeightBold',
-      'minimumContrastRatio'
+      'minimumContrastRatio',
+      'rescaleOverlappingGlyphs'
     ], () => {
       this.clear();
       this.handleResize(bufferService.cols, bufferService.rows);

src/common/services/OptionsService.ts

@@ -44,6 +44,7 @@ export const DEFAULT_OPTIONS: Readonly<Required<ITerminalOptions>> = {
   allowTransparency: false,
   tabStopWidth: 8,
   theme: {},
+  rescaleOverlappingGlyphs: false,
   rightClickSelectsWord: isMac,
   windowOptions: {},
   windowsMode: false,

src/common/services/Services.ts

@@ -234,6 +234,7 @@ export interface ITerminalOptions {
   macOptionIsMeta?: boolean;
   macOptionClickForcesSelection?: boolean;
   minimumContrastRatio?: number;
+  rescaleOverlappingGlyphs?: boolean;
   rightClickSelectsWord?: boolean;
   rows?: number;
   screenReaderMode?: boolean;