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Revamped still-image

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This commit is contained in:
Mergan 2023-09-12 02:48:53 -07:00
parent 174f98b1cb
commit e13c4b6b85
2 changed files with 75 additions and 30 deletions
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103
src/components/still-image/still-image.js
View file

@ -39,27 +39,18 @@ const StillImage = {
this.imageLoadError && this.imageLoadError()
},
detectAnimation (image) {
// If there are no file extensions, the mimetype isn't set, and no mediaproxy is available, we can't figure out
// the mimetype of the image.
const hasFileExtension = this.src.split('/').pop().includes('.') // TODO: Better check?
const mediaProxyAvailable = this.$store.state.instance.mediaProxyAvailable
if (!hasFileExtension && this.mimetype === undefined && !mediaProxyAvailable) {
// It's a bit aggressive to assume all images we can't find the mimetype of is animated, but necessary for
// people in need of reduced motion accessibility. As such, we'll consider those images animated if the user
// agent is set to prefer reduced motion. Otherwise, it'll just be used as an early exit.
if (window.matchMedia('(prefers-reduced-motion: reduce)').matches)
this.isAnimated = true
return
// It's a bit aggressive to assume all images we can't find the mimetype of is animated, but necessary for
// people in need of reduced motion accessibility. As such, we'll consider those images animated if the user
// agent is set to prefer reduced motion. Otherwise, it'll just be used as an early exit.
if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
this.isAnimated = true
}
if (this.mimetype === 'image/gif' || this.src.endsWith('.gif')) {
this.isAnimated = true
return
}
const mediaProxyAvailable = this.$store.state.instance.mediaProxyAvailable
// harmless CORS errors without-- clean console with
if (!mediaProxyAvailable) return
// Animated JPEGs?
if (!(this.src.endsWith('.webp') || this.src.endsWith('.png'))) return
// Browser Cache should ensure image doesn't get loaded twice if cache exists
fetch(image.src, {
referrerPolicy: 'same-origin'
@ -68,11 +59,16 @@ const StillImage = {
// We don't need to read the whole file so only call it once
data.body.getReader().read()
.then(reader => {
if (this.src.endsWith('.webp') && this.isAnimatedWEBP(reader.value)) {
// Ordered from least to most intensive
if (this.isGIF(reader.value)) {
this.isAnimated = true
return
}
if (this.src.endsWith('.png') && this.isAnimatedPNG(reader.value)) {
if (this.isAnimatedWEBP(reader.value)) {
this.isAnimated = true
return
}
if (this.isAnimatedPNG(reader.value)) {
this.isAnimated = true
}
})
@ -81,6 +77,20 @@ const StillImage = {
// this.imageLoadError && this.imageLoadError()
})
},
isGIF (data) {
// I am a perfectly sane individual
//
// GIF HEADER CHUNK
// === START HEADER ===
// 47 49 46 38 ("GIF8")
const gifHeader = [0x47, 0x49, 0x46];
for (let i = 0; i < 3; i++) {
if (data[i] !== gifHeader[i]) {
return false;
}
}
return true
},
isAnimatedWEBP (data) {
/**
* WEBP HEADER CHUNK
@ -114,16 +124,51 @@ const StillImage = {
const idatPos = str.indexOf('IDAT')
return (str.substring(0, idatPos > 0 ? idatPos : 0).indexOf('acTL') > 0)
},
drawThumbnail () {
const canvas = this.$refs.canvas
if (!this.$refs.canvas) return
const image = this.$refs.src
const width = image.naturalWidth
const height = image.naturalHeight
canvas.width = width
canvas.height = height
canvas.getContext('2d').drawImage(image, 0, 0, width, height)
}
drawThumbnail() {
const canvas = this.$refs.canvas;
if (!canvas) return;
const context = canvas.getContext('2d');
const image = this.$refs.src;
const parentElement = canvas.parentElement;
// Draw the quick, unscaled version first
context.drawImage(image, 0, 0, parentElement.clientWidth, parentElement.clientHeight);
// Use requestAnimationFrame to schedule the scaling to the next frame
requestAnimationFrame(() => {
// Adjust for high-DPI displays
const ratio = window.devicePixelRatio || 1;
canvas.width = parentElement.clientWidth * ratio;
canvas.height = parentElement.clientHeight * ratio;
canvas.style.width = `${parentElement.clientWidth}px`;
canvas.style.height = `${parentElement.clientHeight}px`;
context.scale(ratio, ratio);
// Maintain the aspect ratio of the image
const imgAspectRatio = image.naturalWidth / image.naturalHeight;
const canvasAspectRatio = parentElement.clientWidth / parentElement.clientHeight;
let drawWidth, drawHeight;
if (imgAspectRatio > canvasAspectRatio) {
drawWidth = parentElement.clientWidth;
drawHeight = parentElement.clientWidth / imgAspectRatio;
} else {
drawHeight = parentElement.clientHeight;
drawWidth = parentElement.clientHeight * imgAspectRatio;
}
context.clearRect(0, 0, canvas.width, canvas.height); // Clear the previous unscaled image
context.imageSmoothingEnabled = true;
context.imageSmoothingQuality = 'high';
// Draw the good one for realsies
const dx = (parentElement.clientWidth - drawWidth) / 2;
const dy = (parentElement.clientHeight - drawHeight) / 2;
context.drawImage(image, dx, dy, drawWidth, drawHeight);
});
}
},
updated () {
// On computed animated change

2
src/components/still-image/still-image.vue
View file

@ -60,7 +60,7 @@
&.animated {
&::before {
zoom: var(--_still_image-label-scale, 1);
content: 'gif';
content: var(--image-type-label, 'A?');
position: absolute;
line-height: 1;
font-size: 0.7em;