1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROIDFW_ATTRIBUTERESOLUTION_H
18#define ANDROIDFW_ATTRIBUTERESOLUTION_H
19
20#include <androidfw/ResourceTypes.h>
21
22namespace android {
23
24// Offsets into the outValues array populated by the methods below. outValues is a uint32_t
25// array, but each logical element takes up 6 uint32_t-sized physical elements.
26enum {
27  STYLE_NUM_ENTRIES = 6,
28  STYLE_TYPE = 0,
29  STYLE_DATA = 1,
30  STYLE_ASSET_COOKIE = 2,
31  STYLE_RESOURCE_ID = 3,
32  STYLE_CHANGING_CONFIGURATIONS = 4,
33  STYLE_DENSITY = 5
34};
35
36// These are all variations of the same method. They each perform the exact same operation,
37// but on various data sources. I *think* they are re-written to avoid an extra branch
38// in the inner loop, but after one branch miss (some pointer != null), the branch predictor should
39// predict the rest of the iterations' branch correctly.
40// TODO(adamlesinski): Run performance tests against these methods and a new, single method
41// that uses all the sources and branches to the right ones within the inner loop.
42
43// `out_values` must NOT be nullptr.
44// `out_indices` may be nullptr.
45bool ResolveAttrs(ResTable::Theme* theme, uint32_t def_style_attr, uint32_t def_style_res,
46                  uint32_t* src_values, size_t src_values_length, uint32_t* attrs,
47                  size_t attrs_length, uint32_t* out_values, uint32_t* out_indices);
48
49// `out_values` must NOT be nullptr.
50// `out_indices` is NOT optional and must NOT be nullptr.
51void ApplyStyle(ResTable::Theme* theme, ResXMLParser* xml_parser, uint32_t def_style_attr,
52                uint32_t def_style_res, const uint32_t* attrs, size_t attrs_length,
53                uint32_t* out_values, uint32_t* out_indices);
54
55// `out_values` must NOT be nullptr.
56// `out_indices` may be nullptr.
57bool RetrieveAttributes(const ResTable* res, ResXMLParser* xml_parser, uint32_t* attrs,
58                        size_t attrs_length, uint32_t* out_values, uint32_t* out_indices);
59
60}  // namespace android
61
62#endif /* ANDROIDFW_ATTRIBUTERESOLUTION_H */
63