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content / child / font_warmup_win.h [blame]
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_CHILD_FONT_WARMUP_WIN_H_
#define CONTENT_CHILD_FONT_WARMUP_WIN_H_
#include <stddef.h>
#include "base/files/file_path.h"
#include "content/common/content_export.h"
class SkFontMgr;
template <typename T> class sk_sp;
namespace content {
class GdiFontPatchData {
public:
GdiFontPatchData(const GdiFontPatchData&) = delete;
GdiFontPatchData& operator=(const GdiFontPatchData&) = delete;
virtual ~GdiFontPatchData() {}
protected:
GdiFontPatchData() {}
};
// Hook a module's imported GDI font functions to reimplement font enumeration
// and font data retrieval for DLLs which can't be easily modified.
CONTENT_EXPORT GdiFontPatchData* PatchGdiFontEnumeration(
const base::FilePath& path);
// Testing method to get the number of in-flight emulated GDI handles.
CONTENT_EXPORT size_t GetEmulatedGdiHandleCountForTesting();
// Testing method to reset the table of emulated GDI handles.
CONTENT_EXPORT void ResetEmulatedGdiHandlesForTesting();
// Sets the pre-sandbox warmup font manager directly. This should only be used
// for testing the implementation.
CONTENT_EXPORT void SetPreSandboxWarmupFontMgrForTesting(
sk_sp<SkFontMgr> fontmgr);
// Directwrite connects to the font cache service to retrieve information about
// fonts installed on the system etc. This works well outside the sandbox and
// within the sandbox as long as the lpc connection maintained by the current
// process with the font cache service remains valid. It appears that there
// are cases when this connection is dropped after which directwrite is unable
// to connect to the font cache service which causes problems with characters
// disappearing.
// Directwrite has fallback code to enumerate fonts if it is unable to connect
// to the font cache service. We need to intercept the following APIs to
// ensure that it does not connect to the font cache service.
// NtALpcConnectPort
// OpenSCManagerW
// OpenServiceW
// StartServiceW
// CloseServiceHandle.
// These are all IAT patched.
CONTENT_EXPORT void PatchServiceManagerCalls();
} // namespace content
#endif // CONTENT_CHILD_FONT_WARMUP_WIN_H_