def load_jxr_data(data):
with TemporaryDirectory() as tdir:
if isinstance(tdir, bytes):
tdir = os.fsdecode(tdir)
with lopen(os.path.join(tdir, 'input.jxr'), 'wb') as f:
f.write(data)
cmd = [get_exe_path('JxrDecApp'), '-i', 'input.jxr', '-o', 'output.tif']
creationflags = subprocess.DETACHED_PROCESS if iswindows else 0
subprocess.Popen(cmd, cwd=tdir, stdout=lopen(os.devnull, 'wb'), stderr=subprocess.STDOUT, creationflags=creationflags).wait()
i = QImage()
if not i.load(os.path.join(tdir, 'output.tif')):
raise NotImage('Failed to convert JPEG-XR image')
return i
def encode_jpeg(file_path, quality=80):
from calibre.utils.speedups import ReadOnlyFileBuffer
quality = max(0, min(100, int(quality)))
exe = get_exe_path('cjpeg')
cmd = [exe] + '-optimize -progressive -maxmemory 100M -quality'.split() + [str(quality)]
img = QImage()
if not img.load(file_path):
raise ValueError('%s is not a valid image file' % file_path)
ba = QByteArray()
buf = QBuffer(ba)
buf.open(QIODevice.OpenModeFlag.WriteOnly)
if not img.save(buf, 'PPM'):
raise ValueError('Failed to export image to PPM')
return run_optimizer(file_path, cmd, as_filter=True, input_data=ReadOnlyFileBuffer(ba.data()))
