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cef/libcef/utility/printing_handler.cc

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// Copyright 2014 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 "libcef/utility/printing_handler.h"
#include "base/file_util.h"
#include "base/lazy_instance.h"
#include "base/path_service.h"
#include "base/scoped_native_library.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_utility_printing_messages.h"
#include "content/public/utility/utility_thread.h"
#include "printing/page_range.h"
#include "printing/pdf_render_settings.h"
#if defined(OS_WIN)
#include "base/win/iat_patch_function.h"
#include "printing/emf_win.h"
#include "ui/gfx/gdi_util.h"
#endif
#if defined(ENABLE_FULL_PRINTING)
#include "printing/backend/print_backend.h"
#endif
namespace {
bool Send(IPC::Message* message) {
return content::UtilityThread::Get()->Send(message);
}
void ReleaseProcessIfNeeded() {
content::UtilityThread::Get()->ReleaseProcessIfNeeded();
}
class PdfFunctionsBase {
public:
PdfFunctionsBase() : render_pdf_to_bitmap_func_(NULL),
get_pdf_doc_info_func_(NULL) {}
bool Init() {
base::FilePath pdf_module_path;
if (!PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf_module_path) ||
!base::PathExists(pdf_module_path)) {
return false;
}
pdf_lib_.Reset(base::LoadNativeLibrary(pdf_module_path, NULL));
if (!pdf_lib_.is_valid()) {
LOG(WARNING) << "Couldn't load PDF plugin";
return false;
}
render_pdf_to_bitmap_func_ =
reinterpret_cast<RenderPDFPageToBitmapProc>(
pdf_lib_.GetFunctionPointer("RenderPDFPageToBitmap"));
LOG_IF(WARNING, !render_pdf_to_bitmap_func_) <<
"Missing RenderPDFPageToBitmap";
get_pdf_doc_info_func_ =
reinterpret_cast<GetPDFDocInfoProc>(
pdf_lib_.GetFunctionPointer("GetPDFDocInfo"));
LOG_IF(WARNING, !get_pdf_doc_info_func_) << "Missing GetPDFDocInfo";
if (!render_pdf_to_bitmap_func_ || !get_pdf_doc_info_func_ ||
!PlatformInit(pdf_module_path, pdf_lib_)) {
Reset();
}
return IsValid();
}
bool IsValid() const {
return pdf_lib_.is_valid();
}
void Reset() {
pdf_lib_.Reset(NULL);
}
bool RenderPDFPageToBitmap(const void* pdf_buffer,
int pdf_buffer_size,
int page_number,
void* bitmap_buffer,
int bitmap_width,
int bitmap_height,
int dpi_x,
int dpi_y,
bool autorotate) {
if (!render_pdf_to_bitmap_func_)
return false;
return render_pdf_to_bitmap_func_(pdf_buffer, pdf_buffer_size, page_number,
bitmap_buffer, bitmap_width,
bitmap_height, dpi_x, dpi_y, autorotate);
}
bool GetPDFDocInfo(const void* pdf_buffer,
int buffer_size,
int* page_count,
double* max_page_width) {
if (!get_pdf_doc_info_func_)
return false;
return get_pdf_doc_info_func_(pdf_buffer, buffer_size, page_count,
max_page_width);
}
protected:
virtual bool PlatformInit(
const base::FilePath& pdf_module_path,
const base::ScopedNativeLibrary& pdf_lib) {
return true;
}
private:
// Exported by PDF plugin.
typedef bool (*RenderPDFPageToBitmapProc)(const void* pdf_buffer,
int pdf_buffer_size,
int page_number,
void* bitmap_buffer,
int bitmap_width,
int bitmap_height,
int dpi_x,
int dpi_y,
bool autorotate);
typedef bool (*GetPDFDocInfoProc)(const void* pdf_buffer,
int buffer_size, int* page_count,
double* max_page_width);
RenderPDFPageToBitmapProc render_pdf_to_bitmap_func_;
GetPDFDocInfoProc get_pdf_doc_info_func_;
base::ScopedNativeLibrary pdf_lib_;
DISALLOW_COPY_AND_ASSIGN(PdfFunctionsBase);
};
#if defined(OS_WIN)
// The 2 below IAT patch functions are almost identical to the code in
// render_process_impl.cc. This is needed to work around specific Windows APIs
// used by the Chrome PDF plugin that will fail in the sandbox.
static base::win::IATPatchFunction g_iat_patch_createdca;
HDC WINAPI UtilityProcess_CreateDCAPatch(LPCSTR driver_name,
LPCSTR device_name,
LPCSTR output,
const DEVMODEA* init_data) {
if (driver_name && (std::string("DISPLAY") == driver_name)) {
// CreateDC fails behind the sandbox, but not CreateCompatibleDC.
return CreateCompatibleDC(NULL);
}
NOTREACHED();
return CreateDCA(driver_name, device_name, output, init_data);
}
static base::win::IATPatchFunction g_iat_patch_get_font_data;
DWORD WINAPI UtilityProcess_GetFontDataPatch(
HDC hdc, DWORD table, DWORD offset, LPVOID buffer, DWORD length) {
int rv = GetFontData(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)) {
content::UtilityThread::Get()->PreCacheFont(logfont);
rv = GetFontData(hdc, table, offset, buffer, length);
content::UtilityThread::Get()->ReleaseCachedFonts();
}
}
return rv;
}
class PdfFunctionsWin : public PdfFunctionsBase {
public:
PdfFunctionsWin() : render_pdf_to_dc_func_(NULL) {
}
bool PlatformInit(
const base::FilePath& pdf_module_path,
const base::ScopedNativeLibrary& pdf_lib) OVERRIDE {
// Patch the IAT for handling specific APIs known to fail in the sandbox.
if (!g_iat_patch_createdca.is_patched()) {
g_iat_patch_createdca.Patch(pdf_module_path.value().c_str(),
"gdi32.dll", "CreateDCA",
UtilityProcess_CreateDCAPatch);
}
if (!g_iat_patch_get_font_data.is_patched()) {
g_iat_patch_get_font_data.Patch(pdf_module_path.value().c_str(),
"gdi32.dll", "GetFontData",
UtilityProcess_GetFontDataPatch);
}
render_pdf_to_dc_func_ =
reinterpret_cast<RenderPDFPageToDCProc>(
pdf_lib.GetFunctionPointer("RenderPDFPageToDC"));
LOG_IF(WARNING, !render_pdf_to_dc_func_) << "Missing RenderPDFPageToDC";
return render_pdf_to_dc_func_ != NULL;
}
bool RenderPDFPageToDC(const void* pdf_buffer,
int buffer_size,
int page_number,
HDC dc,
int dpi_x,
int dpi_y,
int bounds_origin_x,
int bounds_origin_y,
int bounds_width,
int bounds_height,
bool fit_to_bounds,
bool stretch_to_bounds,
bool keep_aspect_ratio,
bool center_in_bounds,
bool autorotate) {
if (!render_pdf_to_dc_func_)
return false;
return render_pdf_to_dc_func_(pdf_buffer, buffer_size, page_number,
dc, dpi_x, dpi_y, bounds_origin_x,
bounds_origin_y, bounds_width, bounds_height,
fit_to_bounds, stretch_to_bounds,
keep_aspect_ratio, center_in_bounds,
autorotate);
}
private:
// Exported by PDF plugin.
typedef bool (*RenderPDFPageToDCProc)(
const void* pdf_buffer, int buffer_size, int page_number, HDC dc,
int dpi_x, int dpi_y, int bounds_origin_x, int bounds_origin_y,
int bounds_width, int bounds_height, bool fit_to_bounds,
bool stretch_to_bounds, bool keep_aspect_ratio, bool center_in_bounds,
bool autorotate);
RenderPDFPageToDCProc render_pdf_to_dc_func_;
DISALLOW_COPY_AND_ASSIGN(PdfFunctionsWin);
};
typedef PdfFunctionsWin PdfFunctions;
#else // OS_WIN
typedef PdfFunctionsBase PdfFunctions;
#endif // OS_WIN
base::LazyInstance<PdfFunctions> g_pdf_lib = LAZY_INSTANCE_INITIALIZER;
} // namespace
PrintingHandler::PrintingHandler() {}
PrintingHandler::~PrintingHandler() {}
// static
void PrintingHandler::PreSandboxStartup() {
g_pdf_lib.Get().Init();
}
bool PrintingHandler::OnMessageReceived(const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PrintingHandler, message)
#if defined(WIN_PDF_METAFILE_FOR_PRINTING)
IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafiles,
OnRenderPDFPagesToMetafile)
#endif
IPC_MESSAGE_HANDLER(ChromeUtilityMsg_GetPrinterCapsAndDefaults,
OnGetPrinterCapsAndDefaults)
IPC_MESSAGE_HANDLER(ChromeUtilityMsg_GetPrinterSemanticCapsAndDefaults,
OnGetPrinterSemanticCapsAndDefaults)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
#if defined(WIN_PDF_METAFILE_FOR_PRINTING)
void PrintingHandler::OnRenderPDFPagesToMetafile(
IPC::PlatformFileForTransit pdf_transit,
const base::FilePath& metafile_path,
const printing::PdfRenderSettings& settings,
const std::vector<printing::PageRange>& page_ranges_const) {
bool succeeded = false;
base::File pdf_file = IPC::PlatformFileForTransitToFile(pdf_transit);
int highest_rendered_page_number = 0;
double scale_factor = 1.0;
std::vector<printing::PageRange> page_ranges = page_ranges_const;
succeeded = RenderPDFToWinMetafile(pdf_file.Pass(),
metafile_path,
settings,
&page_ranges,
&highest_rendered_page_number,
&scale_factor);
if (succeeded) {
// TODO(vitalybuka|scottmg): http://crbug.com/170859. These could
// potentially be sent as each page is converted so that the spool could
// start sooner.
Send(new ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_Succeeded(
page_ranges, scale_factor));
} else {
Send(new ChromeUtilityHostMsg_RenderPDFPagesToMetafile_Failed());
}
ReleaseProcessIfNeeded();
}
#endif
#if defined(WIN_PDF_METAFILE_FOR_PRINTING)
bool PrintingHandler::RenderPDFToWinMetafile(
base::File pdf_file,
const base::FilePath& metafile_path,
const printing::PdfRenderSettings& settings,
std::vector<printing::PageRange>* page_ranges,
int* highest_rendered_page_number,
double* scale_factor) {
DCHECK(page_ranges);
*highest_rendered_page_number = -1;
*scale_factor = 1.0;
if (!g_pdf_lib.Get().IsValid())
return false;
// TODO(sanjeevr): Add a method to the PDF DLL that takes in a file handle
// and a page range array. That way we don't need to read the entire PDF into
// memory.
int64 length = pdf_file.GetLength();
if (length < 0)
return false;
std::vector<char> buffer;
buffer.resize(length);
if (length != pdf_file.Read(0, &buffer.front(), length))
return false;
int total_page_count = 0;
if (!g_pdf_lib.Get().GetPDFDocInfo(&buffer.front(), buffer.size(),
&total_page_count, NULL)) {
return false;
}
// If no range supplied, do all pages.
if (page_ranges->empty()) {
printing::PageRange page_range_all;
page_range_all.from = 0;
page_range_all.to = total_page_count - 1;
page_ranges->push_back(page_range_all);
}
bool ret = false;
std::vector<printing::PageRange>::const_iterator iter;
for (iter = page_ranges->begin(); iter != page_ranges->end(); ++iter) {
for (int page_number = iter->from; page_number <= iter->to; ++page_number) {
if (page_number >= total_page_count)
break;
printing::Emf metafile;
metafile.InitToFile(metafile_path.InsertBeforeExtensionASCII(
base::StringPrintf(".%d", page_number)));
// We need to scale down DC to fit an entire page into DC available area.
// Current metafile is based on screen DC and have current screen size.
// Writing outside of those boundaries will result in the cut-off output.
// On metafiles (this is the case here), scaling down will still record
// original coordinates and we'll be able to print in full resolution.
// Before playback we'll need to counter the scaling up that will happen
// in the service (print_system_win.cc).
*scale_factor = gfx::CalculatePageScale(metafile.context(),
settings.area().right(),
settings.area().bottom());
gfx::ScaleDC(metafile.context(), *scale_factor);
// The underlying metafile is of type Emf and ignores the arguments passed
// to StartPage.
metafile.StartPage(gfx::Size(), gfx::Rect(), 1);
if (g_pdf_lib.Get().RenderPDFPageToDC(
&buffer.front(), buffer.size(), page_number, metafile.context(),
settings.dpi(), settings.dpi(), settings.area().x(),
settings.area().y(), settings.area().width(),
settings.area().height(), true, false, true, true,
settings.autorotate())) {
if (*highest_rendered_page_number < page_number)
*highest_rendered_page_number = page_number;
ret = true;
}
metafile.FinishPage();
metafile.FinishDocument();
}
}
return ret;
}
#endif // defined(WIN_PDF_METAFILE_FOR_PRINTING)
void PrintingHandler::OnGetPrinterCapsAndDefaults(
const std::string& printer_name) {
scoped_refptr<printing::PrintBackend> print_backend =
printing::PrintBackend::CreateInstance(NULL);
printing::PrinterCapsAndDefaults printer_info;
if (print_backend->GetPrinterCapsAndDefaults(printer_name, &printer_info)) {
Send(new ChromeUtilityHostMsg_GetPrinterCapsAndDefaults_Succeeded(
printer_name, printer_info));
} else {
Send(new ChromeUtilityHostMsg_GetPrinterCapsAndDefaults_Failed(
printer_name));
}
ReleaseProcessIfNeeded();
}
void PrintingHandler::OnGetPrinterSemanticCapsAndDefaults(
const std::string& printer_name) {
scoped_refptr<printing::PrintBackend> print_backend =
printing::PrintBackend::CreateInstance(NULL);
printing::PrinterSemanticCapsAndDefaults printer_info;
if (print_backend->GetPrinterSemanticCapsAndDefaults(printer_name,
&printer_info)) {
Send(new ChromeUtilityHostMsg_GetPrinterSemanticCapsAndDefaults_Succeeded(
printer_name, printer_info));
} else {
Send(new ChromeUtilityHostMsg_GetPrinterSemanticCapsAndDefaults_Failed(
printer_name));
}
ReleaseProcessIfNeeded();
}
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