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/AssetManager2.h" 21 #include "androidfw/ResourceTypes.h" 22 23 namespace android { 24 25 // Offsets into the outValues array populated by the methods below. outValues is a uint32_t 26 // array, but each logical element takes up 7 uint32_t-sized physical elements. 27 // Keep these in sync with android.content.res.TypedArray java class 28 enum { 29 STYLE_NUM_ENTRIES = 7, 30 STYLE_TYPE = 0, 31 STYLE_DATA = 1, 32 STYLE_ASSET_COOKIE = 2, 33 STYLE_RESOURCE_ID = 3, 34 STYLE_CHANGING_CONFIGURATIONS = 4, 35 STYLE_DENSITY = 5, 36 STYLE_SOURCE_RESOURCE_ID = 6 37 }; 38 39 // These are all variations of the same method. They each perform the exact same operation, 40 // but on various data sources. I *think* they are re-written to avoid an extra branch 41 // in the inner loop, but after one branch miss (some pointer != null), the branch predictor should 42 // predict the rest of the iterations' branch correctly. 43 // TODO(adamlesinski): Run performance tests against these methods and a new, single method 44 // that uses all the sources and branches to the right ones within the inner loop. 45 46 // `out_values` must NOT be nullptr. 47 // `out_indices` may be nullptr. 48 base::expected<std::monostate, IOError> ResolveAttrs(Theme* theme, uint32_t def_style_attr, 49 uint32_t def_style_resid, uint32_t* src_values, 50 size_t src_values_length, uint32_t* attrs, 51 size_t attrs_length, uint32_t* out_values, 52 uint32_t* out_indices); 53 54 // `out_values` must NOT be nullptr. 55 // `out_indices` is NOT optional and must NOT be nullptr. 56 base::expected<std::monostate, IOError> ApplyStyle(Theme* theme, ResXMLParser* xml_parser, 57 uint32_t def_style_attr, 58 uint32_t def_style_resid, 59 const uint32_t* attrs, size_t attrs_length, 60 uint32_t* out_values, uint32_t* out_indices); 61 62 // `out_values` must NOT be nullptr. 63 // `out_indices` may be nullptr. 64 base::expected<std::monostate, IOError> RetrieveAttributes(AssetManager2* assetmanager, 65 ResXMLParser* xml_parser, 66 uint32_t* attrs, 67 size_t attrs_length, 68 uint32_t* out_values, 69 uint32_t* out_indices); 70 71 } // namespace android 72 73 #endif /* ANDROIDFW_ATTRIBUTERESOLUTION_H */ 74