From 7eeea5e694c142803a37564ef8886d4fc4d2dab4 Mon Sep 17 00:00:00 2001
From: Innei <i@innei.in>
Date: Mon, 11 Nov 2024 15:35:17 +0800
Subject: [PATCH] feat: discover rsshub card background use single color

Signed-off-by: Innei <i@innei.in>
---
 .../modules/discover/recommendations-card.tsx | 40 ++++++++++++++-----
 apps/renderer/src/modules/feed/feed-icon.tsx  |  1 -
 packages/utils/src/color.ts                   | 16 ++++++++
 3 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/apps/renderer/src/modules/discover/recommendations-card.tsx b/apps/renderer/src/modules/discover/recommendations-card.tsx
index fbe17b2c4..21f7ed482 100644
--- a/apps/renderer/src/modules/discover/recommendations-card.tsx
+++ b/apps/renderer/src/modules/discover/recommendations-card.tsx
@@ -1,8 +1,10 @@
 import { Card, CardContent, CardHeader, CardTitle } from "@follow/components/ui/card/index.jsx"
+import { getDominantColor } from "@follow/utils/color"
+import { cn, getUrlIcon } from "@follow/utils/utils"
 import clsx from "clsx"
 import { upperFirst } from "lodash-es"
 import type { FC } from "react"
-import { memo, useMemo } from "react"
+import { memo, useEffect, useMemo, useState } from "react"
 import { useTranslation } from "react-i18next"
 
 import { useModalStack } from "~/components/ui/modal/stacked/hooks"
@@ -46,13 +48,8 @@ export const RecommendationCard: FC<RecommendationCardProps> = memo(
       <Card className={styles["recommendations-card"]}>
         <CardHeader className="relative p-5 pb-3 @container">
           <div className="absolute left-0 top-0 h-[50px] w-full overflow-hidden @[280px]:h-[80px] dark:brightness-75">
-            <span className="opacity-50 blur-2xl">
-              <FeedIcon
-                disableFadeIn
-                siteUrl={`https://${data.url}`}
-                size={400}
-                className="pointer-events-none size-[500px]"
-              />
+            <span className="pointer-events-none opacity-50">
+              <BackgroundGradient className="size-full" url={data.url} />
             </span>
           </div>
 
@@ -85,7 +82,7 @@ export const RecommendationCard: FC<RecommendationCardProps> = memo(
               >
                 <button
                   type="button"
-                  className="relative rounded p-0.5 px-1 duration-200 before:absolute before:inset-y-0 before:-left-2 before:my-auto before:size-1.5 before:rounded-full before:bg-accent before:content-[''] group-hover:bg-muted"
+                  className="relative rounded p-0.5 px-1 text-left duration-200 before:absolute before:inset-y-0 before:-left-2 before:mb-auto before:mt-2 before:size-1.5 before:rounded-full before:bg-accent before:content-[''] group-hover:bg-muted"
                   onClick={() => {
                     present({
                       id: `recommendation-content-${route}`,
@@ -155,3 +152,28 @@ export const RecommendationCard: FC<RecommendationCardProps> = memo(
     )
   },
 )
+
+const BackgroundGradient = memo(({ url, className }: { url: string; className?: string }) => {
+  const [color, setColor] = useState<string>()
+
+  useEffect(() => {
+    const { src } = getUrlIcon(`https://${url}`)
+    const image = new Image()
+    image.src = src
+    image.crossOrigin = "anonymous"
+    image.onload = () => {
+      try {
+        const color = getDominantColor(image)
+        setColor(color)
+      } catch {
+        setColor("#333")
+      }
+    }
+  }, [url])
+  return (
+    <div
+      className={cn("pointer-events-none size-[500px]", className)}
+      style={{ backgroundColor: color }}
+    />
+  )
+})
diff --git a/apps/renderer/src/modules/feed/feed-icon.tsx b/apps/renderer/src/modules/feed/feed-icon.tsx
index b4abb75c0..e23e6ea9a 100644
--- a/apps/renderer/src/modules/feed/feed-icon.tsx
+++ b/apps/renderer/src/modules/feed/feed-icon.tsx
@@ -20,7 +20,6 @@ const getFeedIconSrc = ({
   fallback?: boolean
   proxy?: { height: number; width: number }
 } = {}) => {
-  // src ? getProxyUrl(src) : "";
   if (src) {
     if (proxy) {
       return [
diff --git a/packages/utils/src/color.ts b/packages/utils/src/color.ts
index b38cf8baf..ea85e0be8 100644
--- a/packages/utils/src/color.ts
+++ b/packages/utils/src/color.ts
@@ -111,3 +111,19 @@ export const getBackgroundGradient = (seed?: Nullable<string>) => {
     bgAccentUltraLight,
   ]
 }
+
+export function getDominantColor(imageObject: HTMLImageElement) {
+  const canvas = document.createElement("canvas"),
+    ctx = canvas.getContext("2d")!
+
+  canvas.width = 1
+  canvas.height = 1
+
+  // draw the image to one pixel and let the browser find the dominant color
+  ctx.drawImage(imageObject, 0, 0, 1, 1)
+
+  // get pixel color
+  const i = ctx.getImageData(0, 0, 1, 1).data
+
+  return `#${((1 << 24) + (i[0] << 16) + (i[1] << 8) + i[2]).toString(16).slice(1)}`
+}