blob: 873e352f41302aa64a5e7909b722f8d977b7d7b8 [file] [log] [blame]
// Copyright 2015 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 "chrome/child/pdf_child_init.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "build/build_config.h"
#include "chrome/common/chrome_paths.h"
#include "content/public/child/child_thread.h"
#if defined(OS_WIN)
#include "base/win/current_module.h"
#include "base/win/iat_patch_function.h"
namespace chrome {
namespace {
#if defined(OS_WIN)
static base::win::IATPatchFunction g_iat_patch_createdca;
HDC WINAPI CreateDCAPatch(LPCSTR driver_name,
LPCSTR device_name,
LPCSTR output,
const void* init_data) {
DCHECK(std::string("DISPLAY") == std::string(driver_name));
// CreateDC fails behind the sandbox, but not CreateCompatibleDC.
return CreateCompatibleDC(NULL);
typedef DWORD (WINAPI* GetFontDataPtr) (HDC hdc,
DWORD table,
DWORD offset,
LPVOID buffer,
DWORD length);
GetFontDataPtr g_original_get_font_data = NULL;
static base::win::IATPatchFunction g_iat_patch_get_font_data;
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)) {
std::vector<char> font_data;
if (content::ChildThread::Get())
rv = g_original_get_font_data(hdc, table, offset, buffer, length);
if (content::ChildThread::Get())
return rv;
#endif // OS_WIN
} // namespace
void InitializePDF() {
#if defined(OS_WIN)
// Need to patch a few functions for font loading to work correctly. This can
// be removed once we switch PDF to use Skia.
HMODULE current_module = CURRENT_MODULE();
g_iat_patch_createdca.PatchFromModule(current_module, "gdi32.dll",
"CreateDCA", CreateDCAPatch);
g_iat_patch_get_font_data.PatchFromModule(current_module, "gdi32.dll",
"GetFontData", GetFontDataPatch);
g_original_get_font_data = reinterpret_cast<GetFontDataPtr>(
#endif // OS_WIN
} // namespace chrome