thestig@chromium.org
431dc5a0d1
TBR=evmar Review URL: http://codereview.chromium.org/149471 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20406 0039d316-1c4b-4281-b951-d872f2087c98
78 linhas
2.1 KiB
C++
78 linhas
2.1 KiB
C++
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <limits>
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#include <windows.h>
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#include "base/logging.h"
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#include "base/sys_info.h"
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#include "chrome/common/transport_dib.h"
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#include "skia/ext/platform_canvas.h"
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TransportDIB::TransportDIB() {
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}
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TransportDIB::~TransportDIB() {
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}
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TransportDIB::TransportDIB(HANDLE handle)
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: shared_memory_(handle, false /* read write */) {
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}
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// static
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TransportDIB* TransportDIB::Create(size_t size, uint32 sequence_num) {
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size_t allocation_granularity = base::SysInfo::VMAllocationGranularity();
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size = size / allocation_granularity + 1;
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size = size * allocation_granularity;
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TransportDIB* dib = new TransportDIB;
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if (!dib->shared_memory_.Create(L"", false /* read write */,
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true /* open existing */, size)) {
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delete dib;
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return NULL;
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}
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dib->size_ = size;
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dib->sequence_num_ = sequence_num;
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return dib;
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}
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// static
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TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) {
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TransportDIB* dib = new TransportDIB(handle);
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if (!dib->shared_memory_.Map(0 /* map whole shared memory segment */)) {
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LOG(ERROR) << "Failed to map transport DIB"
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<< " handle:" << handle
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<< " error:" << GetLastError();
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delete dib;
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return NULL;
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}
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// There doesn't seem to be any way to find the size of the shared memory
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// region! GetFileSize indicates that the handle is invalid. Thus, we
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// conservatively set the size to the maximum and hope that the renderer
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// isn't about to ask us to read off the end of the array.
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dib->size_ = std::numeric_limits<size_t>::max();
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return dib;
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}
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skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
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return new skia::PlatformCanvas(w, h, true, handle());
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}
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void* TransportDIB::memory() const {
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return shared_memory_.memory();
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}
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TransportDIB::Handle TransportDIB::handle() const {
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return shared_memory_.handle();
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}
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TransportDIB::Id TransportDIB::id() const {
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return Id(shared_memory_.handle(), sequence_num_);
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}
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