feat: add blur hash

Signed-off-by: Innei <[email protected]>

package.json

@@ -56,6 +56,7 @@
     "@xterm/addon-fit": "0.10.0",
     "@xterm/xterm": "5.5.0",
     "ansi_up": "6.0.2",
+    "blurhash": "2.0.5",
     "buffer": "6.0.3",
     "canvas-confetti": "1.9.3",
     "class-transformer": "0.5.1",
@@ -127,5 +128,6 @@
     "vite-plugin-wasm": "3.3.0",
     "vite-tsconfig-paths": "4.3.2",
     "windicss": "3.5.6"
-  }
-}
+  },
+  "packageManager": "[email protected]"
+}

src/components/drawer/components/image-detail-section.tsx

@@ -1,3 +1,4 @@
+import { decode } from 'blurhash'
 import { uniqBy } from 'lodash-es'
 import {
   NButton,
@@ -10,11 +11,12 @@ import {
   NInput,
   NInputNumber,
 } from 'naive-ui'
-import { getDominantColor } from '~/utils/image'
-import { isVideoExt, pickImagesFromMarkdown } from '~/utils/markdown'
 import type { Image as ImageModel } from '~/models/base'
 import type { PropType } from 'vue'
 
+import { getBlurHash, getDominantColor } from '~/utils/image'
+import { isVideoExt, pickImagesFromMarkdown } from '~/utils/markdown'
+
 export const ImageDetailSection = defineComponent({
   props: {
     images: {
@@ -57,6 +59,7 @@ export const ImageDetailSection = defineComponent({
                   width: existImageInfo?.width,
                   type: existImageInfo?.type,
                   accent: existImageInfo?.accent,
+                  blurHash: existImageInfo?.blurHash,
                 } as any
               })
               .concat(props.images),
@@ -127,6 +130,7 @@ export const ImageDetailSection = defineComponent({
                   src: item.src,
                   type: ext,
                   accent: getDominantColor($image),
+                  blurHash: getBlurHash($image),
                 })
               })
               $image.onerror = (err) => {
@@ -232,6 +236,14 @@ export const ImageDetailSection = defineComponent({
                     ></NColorPicker>
                   </NFormItem>
 
+                  <NFormItem label="Blur Preview">
+                    <div>
+                      {image.blurHash && (
+                        <BlurHashPreview hash={image.blurHash} />
+                      )}
+                    </div>
+                  </NFormItem>
+
                   <NFormItem label="操作">
                     <div class="flex w-full justify-end">
                       <NButtonGroup>
@@ -267,3 +279,33 @@ export const ImageDetailSection = defineComponent({
     )
   },
 })
+
+const BlurHashPreview = defineComponent({
+  props: {
+    hash: {
+      type: String,
+      required: true,
+    },
+  },
+  setup(props) {
+    const canvasRef = ref<HTMLCanvasElement | null>(null)
+
+    onMounted(() => {
+      const canvas = canvasRef.value!
+      const ctx = canvas.getContext('2d')!
+      const pixels = decode(props.hash, 32, 32)
+      const imageData = ctx.createImageData(32, 32)
+      imageData.data.set(pixels)
+      ctx.putImageData(imageData, 0, 0)
+    })
+
+    return () => (
+      <canvas
+        ref={canvasRef}
+        class="bg-cover bg-center"
+        height={32}
+        width={32}
+      ></canvas>
+    )
+  },
+})

src/models/base.ts

@@ -12,6 +12,7 @@ export interface Image {
   type: string
   accent?: string
   src: string
+  blurHash?: string
 }
 
 export class BaseModel {

src/utils/image.ts

@@ -1,9 +1,10 @@
 // @see https://stackoverflow.com/questions/2541481/get-average-color-of-image-via-javascript
-// @ts-nocheck
+
+import { encode } from 'blurhash'
 
 export function getDominantColor(imageObject: HTMLImageElement) {
   const canvas = document.createElement('canvas'),
-    ctx = canvas.getContext('2d')
+    ctx = canvas.getContext('2d')!
 
   canvas.width = 1
   canvas.height = 1
@@ -26,3 +27,20 @@ export function rgbToHex(red: number, green: number, blue: number) {
 export function rgbObjectToHex(rgb: { r: number; g: number; b: number }) {
   return rgbToHex(rgb.r, rgb.g, rgb.b)
 }
+
+export function getBlurHash(imageObject: HTMLImageElement) {
+  const canvas = document.createElement('canvas'),
+    ctx = canvas.getContext('2d')!
+
+  canvas.width = imageObject.naturalWidth
+  canvas.height = imageObject.naturalHeight
+
+  ctx.drawImage(imageObject, 0, 0)
+
+  const imageData = ctx.getImageData(0, 0, 32, 32)
+  const pixels = new Uint8ClampedArray(imageData.data)
+  const componentX = 4
+  const componentY = 4
+
+  return encode(pixels, 32, 32, componentX, componentY)
+}