From 3e89d2998588f8e35c524e523ba2ee853f0f6475 Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Mon, 20 Apr 2026 11:31:17 +0200
Subject: refactor: restructure files to their domains,  new preview overlay
 system, and dep graph

---
 apps/web/src/text/measure-element.ts | 133 +++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 apps/web/src/text/measure-element.ts

(limited to 'apps/web/src/text/measure-element.ts')

diff --git a/apps/web/src/text/measure-element.ts b/apps/web/src/text/measure-element.ts
new file mode 100644
index 00000000..3a49696f
--- /dev/null
+++ b/apps/web/src/text/measure-element.ts
@@ -0,0 +1,133 @@
+import { CORNER_RADIUS_MIN } from "@/text/background";
+import { resolveNumberAtTime } from "@/animation";
+import { DEFAULTS } from "@/timeline/defaults";
+import type { TextBackground, TextElement } from "@/timeline";
+import {
+	getTextVisualRect,
+} from "./layout";
+import {
+	measureTextLayout,
+	type MeasuredTextLayout,
+} from "./primitives";
+
+export interface ResolvedTextBackground extends TextBackground {
+	paddingX: number;
+	paddingY: number;
+	offsetX: number;
+	offsetY: number;
+	cornerRadius: number;
+}
+
+export interface MeasuredTextElement extends MeasuredTextLayout {
+	resolvedBackground: ResolvedTextBackground;
+	visualRect: { left: number; top: number; width: number; height: number };
+}
+
+let textMeasurementContext:
+	| CanvasRenderingContext2D
+	| OffscreenCanvasRenderingContext2D
+	| null = null;
+
+export function getTextMeasurementContext():
+	| CanvasRenderingContext2D
+	| OffscreenCanvasRenderingContext2D {
+	if (textMeasurementContext) {
+		return textMeasurementContext;
+	}
+
+	if (typeof OffscreenCanvas !== "undefined") {
+		const canvas = new OffscreenCanvas(1, 1);
+		const context = canvas.getContext("2d");
+		if (context) {
+			textMeasurementContext = context;
+			return context;
+		}
+	}
+
+	if (typeof document !== "undefined") {
+		const canvas = document.createElement("canvas");
+		const context = canvas.getContext("2d");
+		if (context) {
+			textMeasurementContext = context;
+			return context;
+		}
+	}
+
+	throw new Error("Failed to create text measurement context");
+}
+
+export function measureTextElement({
+	element,
+	canvasHeight,
+	localTime,
+	ctx,
+}: {
+	element: TextElement;
+	canvasHeight: number;
+	localTime: number;
+	ctx: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D;
+}): MeasuredTextElement {
+	const measuredLayout = measureTextLayout({
+		text: {
+			content: element.content,
+			fontSize: element.fontSize,
+			fontFamily: element.fontFamily,
+			fontWeight: element.fontWeight,
+			fontStyle: element.fontStyle,
+			textAlign: element.textAlign,
+			textDecoration: element.textDecoration,
+			letterSpacing: element.letterSpacing,
+			lineHeight: element.lineHeight,
+		},
+		canvasHeight,
+		ctx,
+	});
+
+	const bg = element.background;
+	const resolvedBackground: ResolvedTextBackground = {
+		...bg,
+		paddingX: resolveNumberAtTime({
+			baseValue: bg.paddingX ?? DEFAULTS.text.background.paddingX,
+			animations: element.animations,
+			propertyPath: "background.paddingX",
+			localTime,
+		}),
+		paddingY: resolveNumberAtTime({
+			baseValue: bg.paddingY ?? DEFAULTS.text.background.paddingY,
+			animations: element.animations,
+			propertyPath: "background.paddingY",
+			localTime,
+		}),
+		offsetX: resolveNumberAtTime({
+			baseValue: bg.offsetX ?? DEFAULTS.text.background.offsetX,
+			animations: element.animations,
+			propertyPath: "background.offsetX",
+			localTime,
+		}),
+		offsetY: resolveNumberAtTime({
+			baseValue: bg.offsetY ?? DEFAULTS.text.background.offsetY,
+			animations: element.animations,
+			propertyPath: "background.offsetY",
+			localTime,
+		}),
+		cornerRadius: resolveNumberAtTime({
+			baseValue: bg.cornerRadius ?? CORNER_RADIUS_MIN,
+			animations: element.animations,
+			propertyPath: "background.cornerRadius",
+			localTime,
+		}),
+	};
+
+	const visualRect = getTextVisualRect({
+		textAlign: element.textAlign,
+		block: measuredLayout.block,
+		background: resolvedBackground,
+		fontSizeRatio: measuredLayout.fontSizeRatio,
+	});
+
+	return {
+		...measuredLayout,
+		resolvedBackground,
+		visualRect,
+	};
+}
-- 
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