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feat(open-sse): support dynamic image aspect ratios for antigravity image generation #3395

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feat(open-sse): support dynamic image aspect ratios for antigravity image generation #3395

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17 changes: 15 additions & 2 deletions open-sse/handlers/imageProviders/antigravity.js
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
// Antigravity image adapter - delegates to the executor for correct request
// envelope (project, model, requestType, sessionId) and auth headers.
import { nowSec } from "./_base.js";
import { nowSec, sizeToAspectRatio } from "./_base.js";
import { getExecutor } from "../../executors/index.js";

// Convert image input (data URI or raw base64) to Gemini inlineData part
Expand Down Expand Up @@ -31,6 +31,19 @@ export default {
const executor = getExecutor("antigravity");
if (!executor) throw new Error("Antigravity executor not found");

// Ensure we use an image model for image generation
const isImageModel = (m) => /image|imagen|image-generation/i.test(m || "");
let targetModel = isImageModel(model) ? model : "gemini-3.1-flash-image";

// If body.size is provided, resolve aspect ratio and append to model
if (body.size && typeof body.size === "string") {
const ratio = sizeToAspectRatio(body.size);
const suffix = ratio.replace(":", "x");
if (!targetModel.includes(suffix)) {
targetModel = `${targetModel}-${suffix}`;
}
}

// Build parts: text prompt + optional input image for editing
const parts = [{ text: body.prompt }];
const imageInput = body.image || (Array.isArray(body.images) && body.images[0]);
Expand All @@ -44,7 +57,7 @@ export default {
};

const result = await executor.execute({
model,
model: targetModel,
body: chatBody,
stream: false,
credentials,
Expand Down