🌈️ apply a wallpaper based on the weather outside
feat(apply): initial Windows multi-monitor setup
Angel Wang
(Jun 26, 2026, 7:37 PM -0600)
725d5c5a
823b6dca
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-4
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src/apply/application.ts
+76
-4
src/apply/application.ts
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import lab from "@colordx/core/plugins/lab"
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import type { ImageAnalysisData } from "../analyze/analysis.ts"
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import { chalkDebug } from "../utils.ts"
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import * as path from "@std/path"
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extend([lab])
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···
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return matchingImages
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}
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export function setWindowsWallpaper() {
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const user32 = Deno.dlopen("user32.dll", {
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SystemParametersInfoA: { parameters: ["u16", "u16", "pointer", "u16"], result: "void" }
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})
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export async function setWindowsWallpaper(tempImagePath: string, ...imagePaths: string[]) {
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interface Rect {
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left: number
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top: number
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right: number
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bottom: number
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}
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interface Vector2 {
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width: number
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height: number
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}
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const pathToUser32 = path.fromFileUrl(
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"file:///C:/Windows/System32/user32.dll",
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); // jank
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const user32 = Deno.dlopen(pathToUser32, {
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SystemParametersInfoA: {
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parameters: ["u16", "u16", "pointer", "u16"],
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result: "bool",
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},
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EnumDisplayMonitors: {
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parameters: ["pointer", "pointer", "pointer", "i32"],
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result: "bool",
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},
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});
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const monitors: Vector2[] = []
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const monitorEnum = new Deno.UnsafeCallback({
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parameters: ["pointer", "pointer", "pointer", "i32"],
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result: "bool",
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}, (_hMon, _hdc, lprcMonitor, _pData) => {
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// grab the buffer of our data...
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const buffer = Deno.UnsafePointerView.getArrayBuffer(lprcMonitor!, 16)
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// ..convert it to an Int32 array...
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const array = Array.from(new Int32Array(buffer))
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// ..then populate: left - right top - bottom
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const rect = { width: Math.abs(array[2] - array[0]), height: Math.abs(array[1] - array[3]) }
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monitors.push(rect)
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return true
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});
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user32.symbols.EnumDisplayMonitors(null, null, monitorEnum.pointer, 0);
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// from this point on monitorsRect is populated
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console.log(monitors)
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for (let i = 0; i < monitors.length; i++) {
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const monitor = monitors[i]
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if (monitor.width >= monitor.height) {
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await $`magick ${imagePaths[i]} -resize ${monitor.width}x -format "%m" ${path.join(tempImagePath, `monitorImage${i}.png`)}`
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} else {
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await $`magick ${imagePaths[i]} -resize x${monitor.height} -format "%m" ${path.join(tempImagePath, `monitorImage${i}.png`)}`
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}
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}
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// TODO: this isn't the right order of images
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console.log(await $`magick ${path.join(tempImagePath, `monitorImage*.png`)} +append ${path.join(tempImagePath, "out.png")}`)
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const pointer = Deno.UnsafePointer.of(
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Buffer.from(
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"C:\\Users\\angelcube\\Pictures\\wallpaper\\vocaloid_morningglory_lobelia.jpg",
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"ascii",
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),
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);
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user32.symbols.SystemParametersInfoA(20, 0, pointer, 3);
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user32.close();
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}