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 22 namespace 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. 26 enum { 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. 45 bool 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. 51 void 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. 57 bool 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