blob: bb730312d312a45b339045eebf6d43fa346a3ee7 [file] [log] [blame]
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/child/pdf_child_init.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_WIN)
#include "base/command_line.h"
#include "base/no_destructor.h"
#include "base/win/current_module.h"
#include "base/win/iat_patch_function.h"
#include "base/win/windows_version.h"
#include "content/public/child/child_thread.h"
#include "content/public/common/content_switches.h"
#include "sandbox/policy/mojom/sandbox.mojom.h"
#include "sandbox/policy/sandbox_type.h"
#include "sandbox/policy/switches.h"
#endif
namespace {
#if BUILDFLAG(IS_WIN)
typedef decltype(::GetFontData)* GetFontDataPtr;
GetFontDataPtr g_original_get_font_data = nullptr;
DWORD WINAPI GetFontDataPatch(HDC hdc,
DWORD table,
DWORD offset,
LPVOID buffer,
DWORD length) {
DWORD rv = g_original_get_font_data(hdc, table, offset, buffer, length);
if (rv == GDI_ERROR && hdc) {
HFONT font = static_cast<HFONT>(GetCurrentObject(hdc, OBJ_FONT));
LOGFONT logfont;
if (GetObject(font, sizeof(LOGFONT), &logfont)) {
if (content::ChildThread::Get())
content::ChildThread::Get()->PreCacheFont(logfont);
rv = g_original_get_font_data(hdc, table, offset, buffer, length);
if (content::ChildThread::Get())
content::ChildThread::Get()->ReleaseCachedFonts();
}
}
return rv;
}
#endif // BUILDFLAG(IS_WIN)
} // namespace
void MaybePatchGdiGetFontData() {
#if BUILDFLAG(IS_WIN)
// Only patch utility processes which explicitly need GDI.
auto& command_line = *base::CommandLine::ForCurrentProcess();
auto service_sandbox_type =
sandbox::policy::SandboxTypeFromCommandLine(command_line);
bool need_gdi =
service_sandbox_type == sandbox::mojom::Sandbox::kPrintCompositor ||
service_sandbox_type == sandbox::mojom::Sandbox::kPdfConversion;
if (!need_gdi)
return;
#if defined(COMPONENT_BUILD)
HMODULE module = ::GetModuleHandleA("pdfium.dll");
DCHECK(module);
#else
HMODULE module = CURRENT_MODULE();
#endif // defined(COMPONENT_BUILD)
// Need to patch GetFontData() for font loading to work correctly.
// TODO(crbug.com/pdfium/11): Can be removed once PDFium switches to use Skia.
static base::NoDestructor<base::win::IATPatchFunction> patch_get_font_data;
patch_get_font_data->PatchFromModule(
module, "gdi32.dll", "GetFontData",
reinterpret_cast<void*>(GetFontDataPatch));
g_original_get_font_data = reinterpret_cast<GetFontDataPtr>(
patch_get_font_data->original_function());
#endif // BUILDFLAG(IS_WIN)
}