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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "RuleGenerator.h"
#include <algorithm>
#include <cmath>
#include <vector>
#include <androidfw/ResourceTypes.h>
using namespace android;
namespace split {
// Calculate the point at which the density selection changes between l and h.
static inline int findMid(int l, int h) {
double root = sqrt((h*h) + (8*l*h));
return (double(-h) + root) / 2.0;
}
sp<Rule> RuleGenerator::generateDensity(const Vector<int>& allDensities, size_t index) {
sp<Rule> densityRule = new Rule();
densityRule->op = Rule::AND_SUBRULES;
const bool anyDensity = allDensities[index] == ResTable_config::DENSITY_ANY;
sp<Rule> any = new Rule();
any->op = Rule::EQUALS;
any->key = Rule::SCREEN_DENSITY;
any->longArgs.add((int)ResTable_config::DENSITY_ANY);
any->negate = !anyDensity;
densityRule->subrules.add(any);
if (!anyDensity) {
if (index > 0) {
sp<Rule> gt = new Rule();
gt->op = Rule::GREATER_THAN;
gt->key = Rule::SCREEN_DENSITY;
gt->longArgs.add(findMid(allDensities[index - 1], allDensities[index]) - 1);
densityRule->subrules.add(gt);
}
if (index + 1 < allDensities.size() && allDensities[index + 1] != ResTable_config::DENSITY_ANY) {
sp<Rule> lt = new Rule();
lt->op = Rule::LESS_THAN;
lt->key = Rule::SCREEN_DENSITY;
lt->longArgs.add(findMid(allDensities[index], allDensities[index + 1]));
densityRule->subrules.add(lt);
}
}
return densityRule;
}
sp<Rule> RuleGenerator::generateAbi(const Vector<abi::Variant>& splitAbis, size_t index) {
const abi::Variant thisAbi = splitAbis[index];
const Vector<abi::Variant>& familyVariants = abi::getVariants(abi::getFamily(thisAbi));
Vector<abi::Variant>::const_iterator start =
std::find(familyVariants.begin(), familyVariants.end(), thisAbi);
Vector<abi::Variant>::const_iterator end = familyVariants.end();
if (index + 1 < splitAbis.size()) {
end = std::find(start, familyVariants.end(), splitAbis[index + 1]);
}
sp<Rule> abiRule = new Rule();
abiRule->op = Rule::CONTAINS_ANY;
abiRule->key = Rule::NATIVE_PLATFORM;
while (start != end) {
abiRule->stringArgs.add(String8(abi::toString(*start)));
++start;
}
return abiRule;
}
sp<Rule> RuleGenerator::generate(const SortedVector<SplitDescription>& group, size_t index) {
sp<Rule> rootRule = new Rule();
rootRule->op = Rule::AND_SUBRULES;
if (group[index].config.locale != 0) {
sp<Rule> locale = new Rule();
locale->op = Rule::EQUALS;
locale->key = Rule::LANGUAGE;
char str[RESTABLE_MAX_LOCALE_LEN];
group[index].config.getBcp47Locale(str);
locale->stringArgs.add(String8(str));
rootRule->subrules.add(locale);
}
if (group[index].config.sdkVersion != 0) {
sp<Rule> sdk = new Rule();
sdk->op = Rule::GREATER_THAN;
sdk->key = Rule::SDK_VERSION;
sdk->longArgs.add(group[index].config.sdkVersion - 1);
rootRule->subrules.add(sdk);
}
if (group[index].config.density != 0) {
size_t densityIndex = 0;
Vector<int> allDensities;
allDensities.add(group[index].config.density);
const size_t groupSize = group.size();
for (size_t i = 0; i < groupSize; i++) {
if (group[i].config.density != group[index].config.density) {
// This group differs by density.
allDensities.clear();
for (size_t j = 0; j < groupSize; j++) {
allDensities.add(group[j].config.density);
}
densityIndex = index;
break;
}
}
rootRule->subrules.add(generateDensity(allDensities, densityIndex));
}
if (group[index].abi != abi::Variant_none) {
size_t abiIndex = 0;
Vector<abi::Variant> allVariants;
allVariants.add(group[index].abi);
const size_t groupSize = group.size();
for (size_t i = 0; i < groupSize; i++) {
if (group[i].abi != group[index].abi) {
// This group differs by ABI.
allVariants.clear();
for (size_t j = 0; j < groupSize; j++) {
allVariants.add(group[j].abi);
}
abiIndex = index;
break;
}
}
rootRule->subrules.add(generateAbi(allVariants, abiIndex));
}
return rootRule;
}
} // namespace split
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