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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_X_XPROTO_INTERNAL_H_
#define UI_GFX_X_XPROTO_INTERNAL_H_
#ifndef IS_X11_IMPL
#error "This file should only be included by //ui/gfx/x:xprotos"
#endif
#include <bitset>
#include <type_traits>
#include "base/component_export.h"
#include "base/logging.h"
#include "base/memory/ref_counted_memory.h"
#include "base/optional.h"
#include "ui/gfx/x/connection.h"
#include "ui/gfx/x/xproto_types.h"
namespace x11 {
template <class Reply>
class Future;
template <typename T, typename Enable = void>
struct EnumBase {
using type = T;
};
template <typename T>
struct EnumBase<T, typename std::enable_if_t<std::is_enum<T>::value>> {
using type = typename std::underlying_type<T>::type;
};
template <typename T>
using EnumBaseType = typename EnumBase<T>::type;
template <typename T>
void ReadError(T* error, ReadBuffer* buf);
// Calls free() on the underlying data when the count drops to 0.
class COMPONENT_EXPORT(X11) MallocedRefCountedMemory
: public base::RefCountedMemory {
public:
explicit MallocedRefCountedMemory(void* data);
MallocedRefCountedMemory(const MallocedRefCountedMemory&) = delete;
MallocedRefCountedMemory& operator=(const MallocedRefCountedMemory&) = delete;
const uint8_t* front() const override;
size_t size() const override;
private:
~MallocedRefCountedMemory() override;
uint8_t* const data_;
};
// Wraps another RefCountedMemory, giving a view into it. Similar to
// base::StringPiece, the data is some contiguous subarray, but unlike
// StringPiece, a counted reference is kept on the underlying memory.
class COMPONENT_EXPORT(X11) OffsetRefCountedMemory
: public base::RefCountedMemory {
public:
OffsetRefCountedMemory(scoped_refptr<base::RefCountedMemory> memory,
size_t offset,
size_t size);
OffsetRefCountedMemory(const OffsetRefCountedMemory&) = delete;
OffsetRefCountedMemory& operator=(const OffsetRefCountedMemory&) = delete;
const uint8_t* front() const override;
size_t size() const override;
private:
~OffsetRefCountedMemory() override;
scoped_refptr<base::RefCountedMemory> memory_;
size_t offset_;
size_t size_;
};
// Wraps a bare pointer and does not take any action when the reference count
// reaches 0. This is used to wrap stack-alloctaed or persistent data so we can
// pass those to Read/ReadEvent/ReadReply which expect RefCountedMemory.
class COMPONENT_EXPORT(X11) UnretainedRefCountedMemory
: public base::RefCountedMemory {
public:
explicit UnretainedRefCountedMemory(const void* data);
UnretainedRefCountedMemory(const UnretainedRefCountedMemory&) = delete;
UnretainedRefCountedMemory& operator=(const UnretainedRefCountedMemory&) =
delete;
const uint8_t* front() const override;
size_t size() const override;
private:
~UnretainedRefCountedMemory() override;
const uint8_t* const data_;
};
template <typename T>
void Read(T* t, ReadBuffer* buf) {
static_assert(std::is_trivially_copyable<T>::value, "");
detail::VerifyAlignment(t, buf->offset);
memcpy(t, buf->data->data() + buf->offset, sizeof(*t));
buf->offset += sizeof(*t);
}
inline void Pad(WriteBuffer* buf, size_t amount) {
uint8_t zero = 0;
for (size_t i = 0; i < amount; i++)
buf->Write(&zero);
}
inline void Pad(ReadBuffer* buf, size_t amount) {
buf->offset += amount;
}
inline void Align(WriteBuffer* buf, size_t align) {
Pad(buf, (align - (buf->offset() % align)) % align);
}
inline void Align(ReadBuffer* buf, size_t align) {
Pad(buf, (align - (buf->offset % align)) % align);
}
base::Optional<unsigned int> SendRequestImpl(x11::Connection* connection,
WriteBuffer* buf,
bool is_void,
bool reply_has_fds);
template <typename Reply>
Future<Reply> SendRequest(x11::Connection* connection,
WriteBuffer* buf,
bool reply_has_fds,
const char* request_name) {
auto sequence = SendRequestImpl(connection, buf, std::is_void<Reply>::value,
reply_has_fds);
return {sequence ? connection : nullptr, sequence,
sequence ? request_name : nullptr};
}
// Helper function for xcbproto popcount. Given an integral type, returns the
// number of 1 bits present.
template <typename T>
size_t PopCount(T t) {
return std::bitset<sizeof(T) * 8>(static_cast<EnumBaseType<T>>(t)).count();
}
// Helper function for xcbproto sumof. Given a function |f| and a container
// |t|, maps the elements uisng |f| and reduces by summing the results.
template <typename F, typename T>
auto SumOf(F&& f, T& t) {
decltype(f(t[0])) sum = 0;
for (auto& v : t)
sum += f(v);
return sum;
}
// Helper function for xcbproto case. Checks for equality between |t| and |s|.
template <typename T, typename S>
bool CaseEq(T t, S s) {
return t == static_cast<decltype(t)>(s);
}
// Helper function for xcbproto bitcase expressions. Checks if the bitmasks |t|
// and |s| have any intersection.
template <typename T, typename S>
bool CaseAnd(T t, S s) {
return static_cast<EnumBaseType<T>>(t) & static_cast<EnumBaseType<T>>(s);
}
// Helper function for xcbproto & expressions. Computes |t| & |s|.
template <typename T, typename S>
auto BitAnd(T t, S s) {
return static_cast<EnumBaseType<T>>(t) & static_cast<EnumBaseType<T>>(s);
}
// Helper function for xcbproto ~ expressions.
template <typename T>
auto BitNot(T t) {
return ~static_cast<EnumBaseType<T>>(t);
}
// Helper function for generating switch values. |switch_var| is the value to
// modify. |enum_val| is the value to set |switch_var| to if this is a regular
// case, or the bit to be set in |switch_var| if this is a bit case. This
// function is a no-op when |condition| is false.
template <typename T>
auto SwitchVar(T enum_val, bool condition, bool is_bitcase, T* switch_var) {
using EnumInt = EnumBaseType<T>;
if (!condition)
return;
EnumInt switch_int = static_cast<EnumInt>(*switch_var);
if (is_bitcase) {
*switch_var = static_cast<T>(switch_int | static_cast<EnumInt>(enum_val));
} else {
DCHECK(!switch_int);
*switch_var = enum_val;
}
}
template <typename T>
std::unique_ptr<T> MakeExtension(Connection* connection,
Future<QueryExtensionReply> future) {
auto reply = future.Sync();
return std::make_unique<T>(connection,
reply ? *reply.reply : QueryExtensionReply{});
}
} // namespace x11
#endif // UI_GFX_X_XPROTO_INTERNAL_H_
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