pleroma-fe/src/components/still-image/still-image.js

const StillImage = {
  props: [
    'src',
    'referrerpolicy',
    'mimetype',
    'imageLoadError',
    'imageLoadHandler',
    'alt',
    'height',
    'width',
    'dataSrc',
    'loading',
  ],
  data() {
    return {
      // for lazy loading, see loadLazy()
      realSrc: this.src,
      stopGifs: this.$store.getters.mergedConfig.stopGifs,
    }
  },
  computed: {
    animated() {
      if (!this.realSrc) {
        return false
      }

      return (
        this.stopGifs &&
        (this.mimetype === 'image/gif' || this.realSrc.endsWith('.gif'))
      )
    },
    style() {
      const appendPx = (str) => (/\d$/.test(str) ? str + 'px' : str)
      return {
        height: this.height ? appendPx(this.height) : null,
        width: this.width ? appendPx(this.width) : null,
      }
    },
  },
  methods: {
    loadLazy() {
      if (this.dataSrc) {
        this.realSrc = this.dataSrc
      }
    },
    onLoad() {
      if (!this.realSrc) {
        return
      }
      const image = this.$refs.src
      if (!image) return
      this.imageLoadHandler && this.imageLoadHandler(image)
      const canvas = this.$refs.canvas
      if (!canvas) return
      const width = image.naturalWidth
      const height = image.naturalHeight
      canvas.width = width
      canvas.height = height
      canvas.getContext('2d').drawImage(image, 0, 0, width, height)
    },
    onError() {
      this.imageLoadError && this.imageLoadError()
    },
  },
  watch: {
    src() {
      this.realSrc = this.src
    },
    dataSrc() {
      this.$el.removeAttribute('data-loaded')
    },
  },
}

export default StillImage