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// 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/memory/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;
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 base::SharedMemory::IsHandleValid(dib);
}
skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
if ((!memory() && !Map()) || !VerifyCanvasSize(w, h))
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(shared_memory_.handle()))
return false;
#if defined(OS_ANDROID)
if (!shared_memory_.Map(0))
return false;
size_ = shared_memory_.mapped_size();
#else
if (memory())
return true;
size_t size;
bool success = base::SharedMemory::GetSizeFromSharedMemoryHandle(
shared_memory_.handle(), &size);
if (!success || !shared_memory_.Map(size))
return false;
size_ = size;
#endif
return true;
}
void* TransportDIB::memory() const {
return shared_memory_.memory();
}
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