mirror of
https://bitbucket.org/chromiumembedded/cef
synced 2025-06-05 21:39:12 +02:00
ebee84755e
This change introduces a few minor CEF API behavior changes: - A CefProcessMessage object cannot be reused after being passed to SendProcessMessage. - The |extra_info| argument to CefRenderProcessHandler::OnBrowserCreated may now be NULL. Where appropriate, we now utilize the default UTF string encoding format and shared memory to reduce copies and conversions for the cross-process transfer of arbitrary-length strings. For example, CefFrame::GetSource/GetText now involves zero UTF conversions and zero copies in the browser process for the CefString delivered to CefStringVisitor::Visit().
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// Copyright 2021 The Chromium Embedded Framework Authors. Portions copyright
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// 2011 The Chromium Authors. All rights reserved. Use of this source code is
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// governed by a BSD-style license that can be found in the LICENSE file.
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#include "libcef/common/string_util.h"
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#include "base/memory/read_only_shared_memory_region.h"
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#include "base/memory/ref_counted_memory.h"
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#include "third_party/blink/public/platform/web_string.h"
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namespace string_util {
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void GetCefString(const blink::WebString& source, CefString& cef_string) {
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#if defined(CEF_STRING_TYPE_UTF8)
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cef_string.FromString(source.Utf8());
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#else
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cef_string.FromString16(source.Utf16());
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#endif
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}
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void GetCefString(scoped_refptr<base::RefCountedMemory> source,
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CefString& cef_string) {
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if (source && source->size() > 0U) {
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#if defined(CEF_STRING_TYPE_UTF8) || defined(CEF_STRING_TYPE_UTF16)
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// Reference existing UTF8 or UTF16 data.
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cef_string.FromString(source->front_as<CefString::char_type>(),
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source->size() / sizeof(CefString::char_type),
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/*copy=*/false);
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#else
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// Must convert from UTF16.
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cef_string.FromString16(
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source->front_as<std::u16string::value_type>(),
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source->size() / sizeof(std::u16string::value_type));
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#endif
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} else {
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cef_string.clear();
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}
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}
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base::ReadOnlySharedMemoryRegion CreateSharedMemoryRegion(
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const blink::WebString& source) {
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base::ReadOnlySharedMemoryRegion region;
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if (!source.IsEmpty()) {
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#if defined(CEF_STRING_TYPE_UTF8)
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const std::string& string = source.Utf8();
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const size_t byte_size = string.length();
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#else
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const std::u16string& string = source.Utf16();
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const size_t byte_size =
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string.length() * sizeof(std::u16string::value_type);
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#endif
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auto mapped_region = base::ReadOnlySharedMemoryRegion::Create(byte_size);
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if (mapped_region.IsValid()) {
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memcpy(mapped_region.mapping.memory(), string.data(), byte_size);
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region = std::move(mapped_region.region);
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}
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}
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return region;
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}
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void ExecuteWithScopedCefString(base::ReadOnlySharedMemoryRegion region,
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ScopedCefStringCallback callback) {
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auto shared_buf =
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base::RefCountedSharedMemoryMapping::CreateFromWholeRegion(region);
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CefString str;
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GetCefString(shared_buf, str);
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std::move(callback).Run(str);
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}
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} // namespace string_util
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