skia WIPjarred/canvas

1 files changed, 86 insertions, 0 deletions

diff --git a/src/deps/skia/include/private/SkTLogic.h b/src/deps/skia/include/private/SkTLogic.h
new file mode 100644
index 000000000..a2c2f4cfd
--- /dev/null
+++ b/src/deps/skia/include/private/SkTLogic.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ *
+ * This header provides some std:: features early in the skstd namespace
+ * and several Skia-specific additions in the sknonstd namespace.
+ */
+
+#ifndef SkTLogic_DEFINED
+#define SkTLogic_DEFINED
+
+#include <cstddef>
+#include <type_traits>
+#include <utility>
+#include "include/private/SkTo.h"
+
+namespace skstd {
+
+// C++17, <variant>
+struct monostate {};
+
+// C++17, <type_traits>
+template<typename...> struct conjunction : std::true_type { };
+template<typename T> struct conjunction<T> : T { };
+template<typename T, typename... Ts>
+struct conjunction<T, Ts...> : std::conditional<bool(T::value), conjunction<Ts...>, T>::type { };
+
+// C++17, std::data, std::size
+template<typename Container>
+constexpr auto data(Container& c) -> decltype(c.data()) { return c.data(); }
+template<typename Container>
+constexpr auto data(const Container& c) -> decltype(c.data()) { return c.data(); }
+template<typename Array, size_t N>
+constexpr auto data(Array(&a)[N]) -> decltype(a) { return a; }
+template<typename T>
+constexpr const T* data(std::initializer_list<T> i) { return i.begin(); }
+
+template<typename Container>
+constexpr auto size(Container& c) -> decltype(c.size()) { return c.size(); }
+template<typename Array, size_t N>
+constexpr size_t size(Array(&)[N]) { return N; }
+template<typename T>
+constexpr const T* size(std::initializer_list<T> i) { return i.end() - i.begin(); }
+}  // namespace skstd
+
+// The sknonstd namespace contains things we would like to be proposed and feel std-ish.
+namespace sknonstd {
+
+// The name 'copy' here is fraught with peril. In this case it means 'append', not 'overwrite'.
+// Alternate proposed names are 'propagate', 'augment', or 'append' (and 'add', but already taken).
+// std::experimental::propagate_const already exists for other purposes in TSv2.
+// These also follow the <dest, source> pattern used by boost.
+template <typename D, typename S> struct copy_const {
+    using type = std::conditional_t<std::is_const<S>::value, std::add_const_t<D>, D>;
+};
+template <typename D, typename S> using copy_const_t = typename copy_const<D, S>::type;
+
+template <typename D, typename S> struct copy_volatile {
+    using type = std::conditional_t<std::is_volatile<S>::value, std::add_volatile_t<D>, D>;
+};
+template <typename D, typename S> using copy_volatile_t = typename copy_volatile<D, S>::type;
+
+template <typename D, typename S> struct copy_cv {
+    using type = copy_volatile_t<copy_const_t<D, S>, S>;
+};
+template <typename D, typename S> using copy_cv_t = typename copy_cv<D, S>::type;
+
+// The name 'same' here means 'overwrite'.
+// Alternate proposed names are 'replace', 'transfer', or 'qualify_from'.
+// same_xxx<D, S> can be written as copy_xxx<remove_xxx_t<D>, S>
+template <typename D, typename S> using same_const = copy_const<std::remove_const_t<D>, S>;
+template <typename D, typename S> using same_const_t = typename same_const<D, S>::type;
+template <typename D, typename S> using same_volatile =copy_volatile<std::remove_volatile_t<D>,S>;
+template <typename D, typename S> using same_volatile_t = typename same_volatile<D, S>::type;
+template <typename D, typename S> using same_cv = copy_cv<std::remove_cv_t<D>, S>;
+template <typename D, typename S> using same_cv_t = typename same_cv<D, S>::type;
+
+}  // namespace sknonstd
+
+template <typename Container>
+constexpr int SkCount(const Container& c) { return SkTo<int>(skstd::size(c)); }
+
+#endif