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// Copyright (c) 2009 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 <limits>
#include <windows.h>
#include "base/logging.h"
#include "base/sys_info.h"
#include "chrome/common/transport_dib.h"
#include "skia/ext/platform_canvas.h"
TransportDIB::TransportDIB() {
}
TransportDIB::~TransportDIB() {
}
TransportDIB::TransportDIB(HANDLE handle)
: shared_memory_(handle, false /* read write */) {
}
// static
TransportDIB* TransportDIB::Create(size_t size, uint32 sequence_num) {
size_t allocation_granularity = base::SysInfo::VMAllocationGranularity();
size = size / allocation_granularity + 1;
size = size * allocation_granularity;
TransportDIB* dib = new TransportDIB;
if (!dib->shared_memory_.Create(L"", false /* read write */,
true /* open existing */, size)) {
delete dib;
return NULL;
}
dib->size_ = size;
dib->sequence_num_ = sequence_num;
return dib;
}
// static
TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) {
TransportDIB* dib = new TransportDIB(handle);
if (!dib->shared_memory_.Map(0 /* map whole shared memory segment */)) {
LOG(ERROR) << "Failed to map transport DIB"
<< " handle:" << handle
<< " error:" << GetLastError();
delete dib;
return NULL;
}
// There doesn't seem to be any way to find the size of the shared memory
// region! GetFileSize indicates that the handle is invalid. Thus, we
// conservatively set the size to the maximum and hope that the renderer
// isn't about to ask us to read off the end of the array.
dib->size_ = std::numeric_limits<size_t>::max();
return dib;
}
skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
return new skia::PlatformCanvas(w, h, true, handle());
}
void* TransportDIB::memory() const {
return shared_memory_.memory();
}
TransportDIB::Handle TransportDIB::handle() const {
return shared_memory_.handle();
}
TransportDIB::Id TransportDIB::id() const {
return Id(shared_memory_.handle(), sequence_num_);
}
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