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1# Copyright 2013 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15import os.path
16import its.caps
17import its.device
18import its.image
19import its.objects
20import its.target
21
22NAME = os.path.basename(__file__).split('.')[0]
23Y_DELTA = 0.1
24GRADIENT_DELTA = 0.1
25
26
27def main():
28    """Test that the android.flash.mode parameter is applied."""
29
30    with its.device.ItsSession() as cam:
31        props = cam.get_camera_properties()
32        its.caps.skip_unless(its.caps.compute_target_exposure(props) and
33                             its.caps.flash(props) and
34                             its.caps.per_frame_control(props))
35
36        flash_modes_reported = []
37        flash_states_reported = []
38        means = []
39        grads = []
40
41        # Manually set the exposure to be a little on the dark side, so that
42        # it should be obvious whether the flash fired or not, and use a
43        # linear tonemap.
44        debug = its.caps.debug_mode()
45        largest_yuv = its.objects.get_largest_yuv_format(props)
46        if debug:
47            fmt = largest_yuv
48        else:
49            match_ar = (largest_yuv['width'], largest_yuv['height'])
50            fmt = its.objects.get_smallest_yuv_format(props, match_ar=match_ar)
51
52        e, s = its.target.get_target_exposure_combos(cam)['midExposureTime']
53        e /= 4
54        req = its.objects.manual_capture_request(s, e, 0.0, True, props)
55
56        for f in [0, 1, 2]:
57            req['android.flash.mode'] = f
58            cap = cam.do_capture(req, fmt)
59            flash_modes_reported.append(cap['metadata']['android.flash.mode'])
60            flash_states_reported.append(cap['metadata']['android.flash.state'])
61            y, _, _ = its.image.convert_capture_to_planes(cap, props)
62            its.image.write_image(y, '%s_%d.jpg' % (NAME, f))
63            tile = its.image.get_image_patch(y, 0.375, 0.375, 0.25, 0.25)
64            its.image.write_image(tile, '%s_%d_tile.jpg' % (NAME, f))
65            means.append(its.image.compute_image_means(tile)[0])
66            grads.append(its.image.compute_image_max_gradients(tile)[0])
67
68        assert flash_modes_reported == [0, 1, 2]
69        assert flash_states_reported[0] not in [3, 4]
70        assert flash_states_reported[1] in [3, 4]
71        assert flash_states_reported[2] in [3, 4]
72
73        print 'Brightnesses:', means
74        print 'Max gradients: ', grads
75        assert means[1]-means[0] > Y_DELTA or grads[1]-grads[0] > GRADIENT_DELTA
76        assert means[2]-means[0] > Y_DELTA or grads[2]-grads[0] > GRADIENT_DELTA
77
78if __name__ == '__main__':
79    main()
80
81