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#!/usr/bin/env python3
"""
Full end-to-end transcoder test with automatic fallback.
- Generates a swirl image
- Compresses it using native OR WASM (AUTO mode)
- Writes test.ktx2
- Decodes it using whichever backends are available:
* AUTO (native if present, otherwise WASM)
* Native (if available)
* WASM (if available)
- Produces PNG outputs for all successful backends
"""
import numpy as np
from math import sin, cos, atan2, hypot
from PIL import Image
import sys
from basisu_py.codec import Encoder, EncoderBackend
from basisu_py.transcoder import Transcoder, TranscoderBackend
from basisu_py.constants import (
BasisTexFormat,
BasisQuality,
BasisEffort,
BasisFlags,
)
# -------------------------------------------------------------------
# Create an RGBA swirl test image
# -------------------------------------------------------------------
def make_swirl(w=256, h=256):
arr = np.zeros((h, w, 4), dtype=np.uint8)
cx, cy = w / 2.0, h / 2.0
for y in range(h):
for x in range(w):
dx, dy = x - cx, y - cy
dist = hypot(dx, dy)
angle = atan2(dy, dx)
r = int((sin(dist * 0.15) * 0.5 + 0.5) * 255)
g = int((sin(angle * 3.0) * 0.5 + 0.5) * 255)
b = int((cos(dist * 0.10 + angle * 2.0) * 0.5 + 0.5) * 255)
arr[y, x] = (r, g, b, 255)
return arr
# -------------------------------------------------------------------
# Try loading transcoder with a backend, return (success, transcoder)
# -------------------------------------------------------------------
def try_transcoder(backend):
try:
t = Transcoder(backend)
print(f"[OK] Loaded transcoder backend '{backend}' ({t.backend_name})")
return True, t
except Exception as e:
print(f"[SKIP] Backend '{backend}' unavailable:", e)
return False, None
# -------------------------------------------------------------------
# Try loading encoder with a backend, return blob or None
# -------------------------------------------------------------------
def try_encoder(backend, img):
try:
enc = Encoder(backend)
print(f"[OK] Loaded encoder backend '{backend}' ({enc.backend_name})")
except Exception as e:
print(f"[SKIP] Encoder backend '{backend}' unavailable:", e)
return None
try:
print(f"[Test] Compressing swirl -> KTX2 using {enc.backend_name}...")
blob = enc.compress(
img,
format=-1,
quality=BasisQuality.MAX,
effort=BasisEffort.DEFAULT,
flags=BasisFlags.KTX2_OUTPUT | BasisFlags.SRGB
)
return blob
except Exception as e:
print(f"[FAIL] Compression failed on backend '{backend}':", e)
return None
# -------------------------------------------------------------------
# Decode blob with a given transcoder
# -------------------------------------------------------------------
def decode_with_backend(name, t, blob):
try:
rgba = t.decode_rgba(blob)
outname = f"decoded_{name}.png"
Image.fromarray(rgba, mode="RGBA").save(outname)
print(f" --> {name}: decoded successfully, wrote {outname}")
except Exception as e:
print(f" [FAIL] decode_rgba on backend '{name}':", e)
# -------------------------------------------------------------------
# Main test
# -------------------------------------------------------------------
if __name__ == "__main__":
print("========== BasisU End-to-End Compression & Transcoding Test ==========")
# -------------------------------------------------------
# Generate swirl test
# -------------------------------------------------------
img = make_swirl(256, 256)
print("[Test] Generated swirl:", img.shape)
# -------------------------------------------------------
# Try AUTO encoder (native if available, else WASM)
# -------------------------------------------------------
blob = try_encoder(EncoderBackend.AUTO, img)
if blob is None:
print("[FAIL] Could not encode using AUTO backend; aborting.")
sys.exit(1)
# Save test.ktx2
with open("test.ktx2", "wb") as f:
f.write(blob)
print("[Test] Wrote: test.ktx2")
# -------------------------------------------------------
# Test transcoding using AUTO
# -------------------------------------------------------
print("\n[Test] Decoding via AUTO backend...")
ok_auto, t_auto = try_transcoder(TranscoderBackend.AUTO)
if ok_auto:
decode_with_backend("auto", t_auto, blob)
# -------------------------------------------------------
# Test NATIVE explicitly (if available)
# -------------------------------------------------------
print("\n[Test] Decoding via NATIVE backend...")
ok_native, t_native = try_transcoder(TranscoderBackend.NATIVE)
if ok_native:
decode_with_backend("native", t_native, blob)
# -------------------------------------------------------
# Test WASM explicitly (if available)
# -------------------------------------------------------
print("\n[Test] Decoding via WASM backend...")
ok_wasm, t_wasm = try_transcoder(TranscoderBackend.WASM)
if ok_wasm:
decode_with_backend("wasm", t_wasm, blob)
print("\n========== DONE ==========")
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