pixel flipper, data sifter. trying to see what I can while I'm here
formData = {
const formData = new FormData()
formData.append("init_image", await blobify(canvas));
formData.append("init_image_mode", "IMAGE_STRENGTH");
formData.append("image_strength", 0.35);
formData.append("text_prompts[0][text]", form.pos);
formData.append("text_prompts[0][weight]", 1.0);
formData.append("text_prompts[1][text]", form.neg);
formData.append("text_prompts[1][weight]", -1.0);
formData.append("cfg_scale", 7);
formData.append("clip_guidance_preset", "FAST_BLUE");
// The API seems to use the dimensions of the input image over these
// formData.append("height", 512);
// formData.append("width", 512);
// formData.append("samples", form.samples);
formData.append("samples", 2);
formData.append("steps", 40);
formData.append('sampler', 'K_EULER_ANCESTRAL')
return formData;
}
new Map(formData.entries())
// The submit button in the form at the top of the notebook just calls the following function:
// stabilityI2Ibasic(engine, formData)
submit = function* (formData) {
if(!formData) return null;
// Observable specific thing
yield "loading";
yield fetch(`https://api.stability.ai/v1beta/generation/${engine}/image-to-image`, {
method: 'POST',
headers: {
'Authorization': `Bearer ${apiKey}`,
// DO NOT set content-type, prevents browser from setting an important boundary property
// 'Content-Type': 'multipart/form-data',
'Accept': "application/json",
},
body: formData
})
.then(response => {
if(response.status !== 200) {
return response.text()
}
return response.json()
})
}
blobify = (canvas) => {
return new Promise((resolve, reject) => {
canvas.toBlob((blob) => {
resolve(blob)
}, 'image/png')
})
}
canvas = resizeToCanvas(url)
url = form.init_image ? await form.init_image.url() : await FileAttachment("openart_ship_drawing.png").url()
async function resizeToCanvas(url, scale = 1) {
let img = new Image();
img.crossOrigin = '*';
img.src = url;
await new Promise(resolve => img.addEventListener('load', resolve));
let w = img.width
let h = img.height
// resize the image appropriately
let f = factorize(w, h, 512)
let sw = Math.floor(f.width * scale)
let sh = Math.floor(f.height * scale)
let ctx = DOM.canvas(sw, sh).getContext('2d');
ctx.drawImage(img, 0, 0, sw, sh);
ctx.canvas.originalWidth = img.width
ctx.canvas.originalHeight = img.height
return ctx.canvas;
}
function factorize(w, h, target) {
// target should be power of 2 probably, like 512 or 1024
let factor = target / Math.max(w, h)
factor = Math.ceil(Math.min(w, h) * factor / 64) * 64 / Math.min(w, h)
w = Math.floor((w * factor) / 64) * 64
h = Math.floor((h * factor) / 64) * 64
return { width: w , height: h }
}
f = factorize(sampleWidth, sampleHeight, factor)
cf = factorize(canvas.originalWidth, canvas.originalHeight, factor)
stability("v1beta/user/balance")
function stability(endpoint, params) {
let url = `https://api.stability.ai/${endpoint}`
return fetch(url, {
headers: {
"Authorization": `Bearer ${apiKey}`
}
}).then(response => {
if(response.status !== 200) {
return response.text()
}
return response.json()
})
}
engines = stability("v1beta/engines/list")
import { loading as spinner } from "@mateh/loading"
import {textcolor} from "@observablehq/text-color-annotations-in-markdown"
// this lets us avoid resubmitting our request everytime our form changes
import {guard} from "@mootari/inputs-submit"
// https://talk.observablehq.com/t/when-do-event-listeners-need-to-be-manually-removed/7160
// this lets us cancel a fetch request if our cell's recalculate before the fetch is complete
function toSignal(invalidation) {
const controller = new AbortController;
invalidation.then(() => controller.abort());
return controller.signal;
}
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