blob: 25a787533da63658346b9851bf8d80e0e459d102 [file] [log] [blame]
// Copyright (c) 2012 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/surface/transport_dib.h"
#include <sys/stat.h>
#include <unistd.h>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/posix/eintr_wrapper.h"
#include "base/shared_memory.h"
#include "skia/ext/platform_canvas.h"
TransportDIB::TransportDIB()
: size_(0) {
}
TransportDIB::TransportDIB(TransportDIB::Handle dib)
: shared_memory_(dib, false /* read write */),
size_(0) {
}
TransportDIB::~TransportDIB() {
}
// static
TransportDIB* TransportDIB::Create(size_t size, uint32 sequence_num) {
TransportDIB* dib = new TransportDIB;
// We will use ashmem_get_size_region() to figure out the size in Map(size).
if (!dib->shared_memory_.CreateAndMapAnonymous(size)) {
delete dib;
return NULL;
}
dib->size_ = size;
return dib;
}
// static
TransportDIB* TransportDIB::Map(Handle handle) {
scoped_ptr<TransportDIB> dib(CreateWithHandle(handle));
if (!dib->Map())
return NULL;
return dib.release();
}
// static
TransportDIB* TransportDIB::CreateWithHandle(Handle handle) {
return new TransportDIB(handle);
}
// static
bool TransportDIB::is_valid_handle(Handle dib) {
return dib.fd >= 0;
}
// static
bool TransportDIB::is_valid_id(Id id) {
// Same as is_valid_handle().
return id.fd >= 0;
}
skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
if (!memory() && !Map())
return NULL;
return skia::CreatePlatformCanvas(w, h, true,
reinterpret_cast<uint8_t*>(memory()),
skia::RETURN_NULL_ON_FAILURE);
}
bool TransportDIB::Map() {
if (!is_valid_handle(handle()))
return false;
// We will use ashmem_get_size_region() to figure out the size in Map(size).
if (!shared_memory_.Map(0))
return false;
// TODO: Note that using created_size() below is a hack. See the comment in
// SharedMemory::Map().
size_ = shared_memory_.created_size();
return true;
}
void* TransportDIB::memory() const {
return shared_memory_.memory();
}
TransportDIB::Id TransportDIB::id() const {
// Use FileDescriptor as id.
return shared_memory_.handle();
}
TransportDIB::Handle TransportDIB::handle() const {
return shared_memory_.handle();
}