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// Copyright 2014 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.
#include "ui/gl/gl_image_shared_memory.h"
#include "base/logging.h"
#include "base/memory/shared_memory.h"
#include "base/numerics/safe_math.h"
#include "base/process/process_handle.h"
#include "base/sys_info.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "base/trace_event/memory_dump_manager.h"
#include "base/trace_event/process_memory_dump.h"
#include "ui/gfx/buffer_format_util.h"
namespace gl {
GLImageSharedMemory::GLImageSharedMemory(const gfx::Size& size,
unsigned internalformat)
: GLImageMemory(size, internalformat) {}
GLImageSharedMemory::~GLImageSharedMemory() {
DCHECK(!shared_memory_);
}
bool GLImageSharedMemory::Initialize(
const base::SharedMemoryHandle& handle,
gfx::GenericSharedMemoryId shared_memory_id,
gfx::BufferFormat format,
size_t offset,
size_t stride) {
if (NumberOfPlanesForBufferFormat(format) != 1)
return false;
base::CheckedNumeric<size_t> checked_size = stride;
checked_size *= GetSize().height();
if (!checked_size.IsValid())
return false;
if (!base::SharedMemory::IsHandleValid(handle))
return false;
base::SharedMemory shared_memory(handle, true);
// Duplicate the handle.
base::SharedMemoryHandle duped_shared_memory_handle;
if (!shared_memory.ShareToProcess(base::GetCurrentProcessHandle(),
&duped_shared_memory_handle)) {
DVLOG(0) << "Failed to duplicate shared memory handle.";
return false;
}
// Minimize the amount of adress space we use but make sure offset is a
// multiple of page size as required by MapAt().
size_t memory_offset = offset % base::SysInfo::VMAllocationGranularity();
size_t map_offset = base::SysInfo::VMAllocationGranularity() *
(offset / base::SysInfo::VMAllocationGranularity());
checked_size += memory_offset;
if (!checked_size.IsValid())
return false;
scoped_ptr<base::SharedMemory> duped_shared_memory(
new base::SharedMemory(duped_shared_memory_handle, true));
if (!duped_shared_memory->MapAt(static_cast<off_t>(map_offset),
checked_size.ValueOrDie())) {
DVLOG(0) << "Failed to map shared memory.";
return false;
}
if (!GLImageMemory::Initialize(
static_cast<uint8_t*>(duped_shared_memory->memory()) + memory_offset,
format, stride)) {
return false;
}
DCHECK(!shared_memory_);
shared_memory_ = std::move(duped_shared_memory);
shared_memory_id_ = shared_memory_id;
return true;
}
void GLImageSharedMemory::Destroy(bool have_context) {
GLImageMemory::Destroy(have_context);
shared_memory_.reset();
}
void GLImageSharedMemory::OnMemoryDump(
base::trace_event::ProcessMemoryDump* pmd,
uint64_t process_tracing_id,
const std::string& dump_name) {
size_t size_in_bytes = 0;
if (shared_memory_)
size_in_bytes = stride() * GetSize().height();
// Dump under "/shared_memory", as the base class may also dump to
// "/texture_memory".
base::trace_event::MemoryAllocatorDump* dump =
pmd->CreateAllocatorDump(dump_name + "/shared_memory");
dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
static_cast<uint64_t>(size_in_bytes));
auto guid = GetGenericSharedMemoryGUIDForTracing(process_tracing_id,
shared_memory_id_);
pmd->CreateSharedGlobalAllocatorDump(guid);
pmd->AddOwnershipEdge(dump->guid(), guid);
}
} // namespace gl
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