Renamed and moved InputWindow and related files
In preparation for the hierarchy listener interface, moved the
InputWindow structs into libgui and have libinput dependant on libgui.
Also renamed InputWindow to exclude Input since it will be used for more
generic purposes.
Test: Builds and flashes
Bug: 188792659
Change-Id: I24262cbc14d409c00273de0024a672394a959e5f
diff --git a/include/ftl/Flags.h b/include/ftl/Flags.h
new file mode 100644
index 0000000..27c8476
--- /dev/null
+++ b/include/ftl/Flags.h
@@ -0,0 +1,280 @@
+/*
+ * Copyright (C) 2020 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 <android-base/stringprintf.h>
+
+#include <array>
+#include <cstdint>
+#include <optional>
+#include <string>
+#include <type_traits>
+
+#include <ftl/NamedEnum.h>
+#include "utils/BitSet.h"
+
+#pragma once
+
+namespace android {
+
+namespace details {
+
+template <typename F>
+inline constexpr auto flag_count = sizeof(F) * __CHAR_BIT__;
+
+template <typename F, typename T, T... I>
+constexpr auto generate_flag_values(std::integer_sequence<T, I...> seq) {
+ constexpr size_t count = seq.size();
+
+ std::array<F, count> values{};
+ for (size_t i = 0, v = 0; v < count; ++i) {
+ values[v++] = static_cast<F>(T{1} << i);
+ }
+
+ return values;
+}
+
+template <typename F>
+inline constexpr auto flag_values = generate_flag_values<F>(
+ std::make_integer_sequence<std::underlying_type_t<F>, flag_count<F>>{});
+
+template <typename F, std::size_t... I>
+constexpr auto generate_flag_names(std::index_sequence<I...>) noexcept {
+ return std::array<std::optional<std::string_view>, sizeof...(I)>{
+ {enum_value_name<F, flag_values<F>[I]>()...}};
+}
+
+template <typename F>
+inline constexpr auto flag_names =
+ generate_flag_names<F>(std::make_index_sequence<flag_count<F>>{});
+
+// A trait for determining whether a type is specifically an enum class or not.
+template <typename T, bool = std::is_enum_v<T>>
+struct is_enum_class : std::false_type {};
+
+// By definition, an enum class is an enum that is not implicitly convertible to its underlying
+// type.
+template <typename T>
+struct is_enum_class<T, true>
+ : std::bool_constant<!std::is_convertible_v<T, std::underlying_type_t<T>>> {};
+
+template <typename T>
+inline constexpr bool is_enum_class_v = is_enum_class<T>::value;
+} // namespace details
+
+template <auto V>
+constexpr auto flag_name() {
+ using F = decltype(V);
+ return details::enum_value_name<F, V>();
+}
+
+template <typename F>
+constexpr std::optional<std::string_view> flag_name(F flag) {
+ using U = std::underlying_type_t<F>;
+ auto idx = static_cast<size_t>(__builtin_ctzl(static_cast<U>(flag)));
+ return details::flag_names<F>[idx];
+}
+
+/* A class for handling flags defined by an enum or enum class in a type-safe way. */
+template <typename F>
+class Flags {
+ // F must be an enum or its underlying type is undefined. Theoretically we could specialize this
+ // further to avoid this restriction but in general we want to encourage the use of enums
+ // anyways.
+ static_assert(std::is_enum_v<F>, "Flags type must be an enum");
+ using U = typename std::underlying_type_t<F>;
+
+public:
+ constexpr Flags(F f) : mFlags(static_cast<U>(f)) {}
+ constexpr Flags() : mFlags(0) {}
+ constexpr Flags(const Flags<F>& f) : mFlags(f.mFlags) {}
+
+ // Provide a non-explicit construct for non-enum classes since they easily convert to their
+ // underlying types (e.g. when used with bitwise operators). For enum classes, however, we
+ // should force them to be explicitly constructed from their underlying types to make full use
+ // of the type checker.
+ template <typename T = U>
+ constexpr Flags(T t, typename std::enable_if_t<!details::is_enum_class_v<F>, T>* = nullptr)
+ : mFlags(t) {}
+ template <typename T = U>
+ explicit constexpr Flags(T t,
+ typename std::enable_if_t<details::is_enum_class_v<F>, T>* = nullptr)
+ : mFlags(t) {}
+
+ class Iterator {
+ // The type can't be larger than 64-bits otherwise it won't fit in BitSet64.
+ static_assert(sizeof(U) <= sizeof(uint64_t));
+
+ public:
+ Iterator(Flags<F> flags) : mRemainingFlags(flags.mFlags) { (*this)++; }
+ Iterator() : mRemainingFlags(0), mCurrFlag(static_cast<F>(0)) {}
+
+ // Pre-fix ++
+ Iterator& operator++() {
+ if (mRemainingFlags.isEmpty()) {
+ mCurrFlag = static_cast<F>(0);
+ } else {
+ uint64_t bit = mRemainingFlags.clearLastMarkedBit(); // counts from left
+ const U flag = 1 << (64 - bit - 1);
+ mCurrFlag = static_cast<F>(flag);
+ }
+ return *this;
+ }
+
+ // Post-fix ++
+ Iterator operator++(int) {
+ Iterator iter = *this;
+ ++*this;
+ return iter;
+ }
+
+ bool operator==(Iterator other) const {
+ return mCurrFlag == other.mCurrFlag && mRemainingFlags == other.mRemainingFlags;
+ }
+
+ bool operator!=(Iterator other) const { return !(*this == other); }
+
+ F operator*() { return mCurrFlag; }
+
+ // iterator traits
+
+ // In the future we could make this a bidirectional const iterator instead of a forward
+ // iterator but it doesn't seem worth the added complexity at this point. This could not,
+ // however, be made a non-const iterator as assigning one flag to another is a non-sensical
+ // operation.
+ using iterator_category = std::input_iterator_tag;
+ using value_type = F;
+ // Per the C++ spec, because input iterators are not assignable the iterator's reference
+ // type does not actually need to be a reference. In fact, making it a reference would imply
+ // that modifying it would change the underlying Flags object, which is obviously wrong for
+ // the same reason this can't be a non-const iterator.
+ using reference = F;
+ using difference_type = void;
+ using pointer = void;
+
+ private:
+ BitSet64 mRemainingFlags;
+ F mCurrFlag;
+ };
+
+ /*
+ * Tests whether the given flag is set.
+ */
+ bool test(F flag) const {
+ U f = static_cast<U>(flag);
+ return (f & mFlags) == f;
+ }
+
+ /* Tests whether any of the given flags are set */
+ bool any(Flags<F> f) { return (mFlags & f.mFlags) != 0; }
+
+ /* Tests whether all of the given flags are set */
+ bool all(Flags<F> f) { return (mFlags & f.mFlags) == f.mFlags; }
+
+ Flags<F> operator|(Flags<F> rhs) const { return static_cast<F>(mFlags | rhs.mFlags); }
+ Flags<F>& operator|=(Flags<F> rhs) {
+ mFlags = mFlags | rhs.mFlags;
+ return *this;
+ }
+
+ Flags<F> operator&(Flags<F> rhs) const { return static_cast<F>(mFlags & rhs.mFlags); }
+ Flags<F>& operator&=(Flags<F> rhs) {
+ mFlags = mFlags & rhs.mFlags;
+ return *this;
+ }
+
+ Flags<F> operator^(Flags<F> rhs) const { return static_cast<F>(mFlags ^ rhs.mFlags); }
+ Flags<F>& operator^=(Flags<F> rhs) {
+ mFlags = mFlags ^ rhs.mFlags;
+ return *this;
+ }
+
+ Flags<F> operator~() { return static_cast<F>(~mFlags); }
+
+ bool operator==(Flags<F> rhs) const { return mFlags == rhs.mFlags; }
+ bool operator!=(Flags<F> rhs) const { return !operator==(rhs); }
+
+ Flags<F>& operator=(const Flags<F>& rhs) {
+ mFlags = rhs.mFlags;
+ return *this;
+ }
+
+ Iterator begin() const { return Iterator(*this); }
+
+ Iterator end() const { return Iterator(); }
+
+ /*
+ * Returns the stored set of flags.
+ *
+ * Note that this returns the underlying type rather than the base enum class. This is because
+ * the value is no longer necessarily a strict member of the enum since the returned value could
+ * be multiple enum variants OR'd together.
+ */
+ U get() const { return mFlags; }
+
+ std::string string() const {
+ std::string result;
+ bool first = true;
+ U unstringified = 0;
+ for (const F f : *this) {
+ std::optional<std::string_view> flagString = flag_name(f);
+ if (flagString) {
+ appendFlag(result, flagString.value(), first);
+ } else {
+ unstringified |= static_cast<U>(f);
+ }
+ }
+
+ if (unstringified != 0) {
+ appendFlag(result, base::StringPrintf("0x%08x", unstringified), first);
+ }
+
+ if (first) {
+ result += "0x0";
+ }
+
+ return result;
+ }
+
+private:
+ U mFlags;
+
+ static void appendFlag(std::string& str, const std::string_view& flag, bool& first) {
+ if (first) {
+ first = false;
+ } else {
+ str += " | ";
+ }
+ str += flag;
+ }
+};
+
+// This namespace provides operator overloads for enum classes to make it easier to work with them
+// as flags. In order to use these, add them via a `using namespace` declaration.
+namespace flag_operators {
+
+template <typename F, typename = std::enable_if_t<details::is_enum_class_v<F>>>
+inline Flags<F> operator~(F f) {
+ using U = typename std::underlying_type_t<F>;
+ return static_cast<F>(~static_cast<U>(f));
+}
+template <typename F, typename = std::enable_if_t<details::is_enum_class_v<F>>>
+Flags<F> operator|(F lhs, F rhs) {
+ using U = typename std::underlying_type_t<F>;
+ return static_cast<F>(static_cast<U>(lhs) | static_cast<U>(rhs));
+}
+
+} // namespace flag_operators
+} // namespace android