From 951d1217b1e4acb1ca88a004e92a93c349c8802a Mon Sep 17 00:00:00 2001
From: Julian Waller <git@julusian.co.uk>
Date: Mon, 28 Mar 2022 23:25:59 +0100
Subject: [PATCH] feat: customisable font scale

---
 src/atem.ts               | 15 ++++++++++++++-
 src/lib/multiviewLabel.ts | 20 +++++++++++++-------
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/src/atem.ts b/src/atem.ts
index b6071d9df..a3b8b9f0f 100644
--- a/src/atem.ts
+++ b/src/atem.ts
@@ -240,11 +240,13 @@ export class BasicAtem extends EventEmitter<AtemEvents> {
 
 export class Atem extends BasicAtem {
 	#multiviewerFontFace: Promise<FontFace>
+	#multiviewerFontScale: number
 
 	constructor(options?: AtemOptions) {
 		super(options)
 
 		this.#multiviewerFontFace = PLazy.from(async () => loadFont())
+		this.#multiviewerFontScale = 1.0
 	}
 
 	/**
@@ -264,6 +266,17 @@ export class Atem extends BasicAtem {
 
 		this.#multiviewerFontFace = Promise.resolve(loadedFont)
 	}
+	/**
+	 * Set the scale factor for the multiviewer text. Default is 1
+	 */
+	public setMultiviewerFontScale(scale: number | null): void {
+		if (typeof scale === 'number') {
+			if (scale <= 0) throw new Error('Scale must be greater than 0')
+			this.#multiviewerFontScale = scale
+		} else if (scale === null) {
+			this.#multiviewerFontScale = 1.0
+		}
+	}
 
 	public async changeProgramInput(input: number, me = 0): Promise<void> {
 		const command = new Commands.ProgramInputCommand(me, input)
@@ -1019,7 +1032,7 @@ export class Atem extends BasicAtem {
 
 		const fontFace = await this.#multiviewerFontFace
 
-		const buffer = generateMultiviewerLabel(fontFace, text, props)
+		const buffer = generateMultiviewerLabel(fontFace, this.#multiviewerFontScale, text, props)
 		// Note: we should probably validate the buffer looks like it doesn't contain crashy data, but as we generate we can trust it
 		return this.dataTransferManager.uploadMultiViewerLabel(inputId, buffer)
 	}
diff --git a/src/lib/multiviewLabel.ts b/src/lib/multiviewLabel.ts
index ac20a8a04..15fb3518d 100644
--- a/src/lib/multiviewLabel.ts
+++ b/src/lib/multiviewLabel.ts
@@ -136,17 +136,19 @@ function calculateWidthAndTrimText(
 
 function drawTextToBuffer(
 	face: FontFace,
+	fontScale: number,
 	buffer: Buffer,
 	spec: ResolutionSpec,
 	rawText: string,
 	bufferYOffset: number,
 	bufferWidth: number
 ): void {
-	face.setPixelSizes(spec.fontHeight, spec.fontHeight)
+	const fontHeight = spec.fontHeight * fontScale
+	face.setPixelSizes(fontHeight, fontHeight)
 
 	const { width: textWidth, str: newStr } = calculateWidthAndTrimText(face, rawText, spec.width - spec.xPad * 2)
 	const boundaryWidth = Math.floor(textWidth + spec.xPad * 2)
-	const boundaryHeight = Math.floor(spec.fontHeight + spec.yPadTop + spec.yPadBottom)
+	const boundaryHeight = Math.floor(fontHeight + spec.yPadTop + spec.yPadBottom)
 	const bufferXOffset = Math.floor((bufferWidth - spec.width) / 2)
 
 	// Fill background of boundary, and a 2px border
@@ -190,7 +192,7 @@ function drawTextToBuffer(
 
 	const maxLeft = boundaryXOffset + spec.width + spec.xPad
 	let charLeft = boundaryXOffset + spec.xPad
-	const textTop = boundaryYOffset + spec.fontHeight + spec.yPadTop
+	const textTop = boundaryYOffset + fontHeight + spec.yPadTop
 
 	// Draw text characters
 	for (let i = 0; i < newStr.length; i++) {
@@ -239,7 +241,12 @@ export interface GenerateMultiviewerLabelProps {
  * @param props Specify which resolutions to generate for
  * @returns Buffer
  */
-export function generateMultiviewerLabel(face: FontFace, str: string, props: GenerateMultiviewerLabelProps): Buffer {
+export function generateMultiviewerLabel(
+	face: FontFace,
+	fontScale: number,
+	str: string,
+	props: GenerateMultiviewerLabelProps
+): Buffer {
 	// Calculate the sizes
 	let width: number | undefined
 	let height = 0
@@ -264,7 +271,7 @@ export function generateMultiviewerLabel(face: FontFace, str: string, props: Gen
 
 	let yOffset = 0
 	const drawRes = (spec: ResolutionSpec): void => {
-		drawTextToBuffer(face, buffer, spec, str, yOffset, width2)
+		drawTextToBuffer(face, fontScale, buffer, spec, str, yOffset, width2)
 		yOffset += spec.height
 	}
 
@@ -325,8 +332,7 @@ export function calculateGenerateMultiviewerLabelProps(
 }
 
 export async function loadFont(fontPath?: string): Promise<FontFace> {
-	// if (!fontPath) fontPath = path.join(__dirname, '../../assets/roboto/Roboto-Regular.ttf')
-	if (!fontPath) fontPath = path.join(__dirname, '../../assets/Helvetica.ttf')
+	if (!fontPath) fontPath = path.join(__dirname, '../../assets/roboto/Roboto-Regular.ttf')
 
 	const fontFile = await readFile(fontPath)
 	return NewMemoryFace(fontFile)