Detailed imp-style sprites for all 30 creatures in the high-res style; sprite texture in bands

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

art/generated/sprites/scripts/gen.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+# Generate creature sprite sheets with fal-ai/nano-banana-pro/edit, the imp's lower row as style ref.
+import base64, json, os, sys, urllib.request, concurrent.futures as cf
+
+OUT = "/home/zink/Projects/dungeoncraft/art/generated/sprites"
+REF = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "style-ref.png")
+KEY = open(os.path.expanduser("~/.config/dungeoncraft/fal-key")).read().strip()
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from creatures import CREATURES, prompt_for
+
+ref_uri = "data:image/png;base64," + base64.b64encode(open(REF, "rb").read()).decode()
+
+
+def gen(cid, suffix=""):
+    body = {"prompt": prompt_for(cid), "image_urls": [ref_uri], "aspect_ratio": "21:9",
+            "resolution": "2K", "num_images": 1, "output_format": "png"}
+    req = urllib.request.Request("https://fal.run/fal-ai/nano-banana-pro/edit",
+                                 data=json.dumps(body).encode(),
+                                 headers={"Authorization": "Key " + KEY, "Content-Type": "application/json"})
+    try:
+        with urllib.request.urlopen(req, timeout=600) as r:
+            res = json.load(r)
+        url = res["images"][0]["url"]
+        with urllib.request.urlopen(url, timeout=300) as r:
+            data = r.read()
+        path = f"{OUT}/{cid}-raw{suffix}.png"
+        open(path, "wb").write(data)
+        return cid, "ok " + path
+    except Exception as e:
+        msg = str(e)
+        if hasattr(e, "read"):
+            try:
+                msg += " " + e.read().decode()[:300]
+            except Exception:
+                pass
+        return cid, "ERROR " + msg
+
+
+if __name__ == "__main__":
+    ids = sys.argv[1:] or [c["id"] for c in CREATURES]
+    suffix = os.environ.get("SUFFIX", "")
+    with cf.ThreadPoolExecutor(4) as ex:
+        for cid, st in ex.map(lambda i: gen(i, suffix), ids):
+            print(cid, st, flush=True)