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// Copyright (c) 2011 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/renderer/print_web_view_helper.h"
#include "base/file_descriptor_posix.h"
#include "base/logging.h"
#include "chrome/common/render_messages.h"
#include "chrome/common/render_messages_params.h"
#include "printing/native_metafile.h"
#include "skia/ext/vector_canvas.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebSize.h"
#if !defined(OS_CHROMEOS)
#include "base/process_util.h"
#endif // !defined(OS_CHROMEOS)
using printing::NativeMetafile;
using WebKit::WebFrame;
using WebKit::WebNode;
using WebKit::WebSize;
void PrintWebViewHelper::PrintPages(const ViewMsg_PrintPages_Params& params,
WebFrame* frame,
WebNode* node) {
// We only can use PDF in the renderer because Cairo needs to create a
// temporary file for a PostScript surface.
printing::NativeMetafile metafile(printing::NativeMetafile::PDF);
int page_count;
skia::VectorCanvas* canvas = NULL;
{
// Hack - when |prep_frame_view| goes out of scope, PrintEnd() gets called.
// Doing this before closing |metafile| below ensures
// webkit::ppapi::PluginInstance::PrintEnd() has a valid canvas/metafile to
// save the final output to. See pepper_plugin_instance.cc for the whole
// story.
ViewMsg_Print_Params printParams = params.params;
PrepareFrameAndViewForPrint prep_frame_view(printParams,
frame,
node,
frame->view());
page_count = prep_frame_view.GetExpectedPageCount();
#if !defined(OS_CHROMEOS)
Send(new ViewHostMsg_DidGetPrintedPagesCount(routing_id(),
printParams.document_cookie,
page_count));
#endif // !defined(OS_CHROMEOS)
if (!page_count)
return;
metafile.Init();
ViewMsg_PrintPage_Params page_params;
page_params.params = printParams;
const gfx::Size& canvas_size = prep_frame_view.GetPrintCanvasSize();
if (params.pages.empty()) {
for (int i = 0; i < page_count; ++i) {
page_params.page_number = i;
delete canvas;
PrintPage(page_params, canvas_size, frame, &metafile, &canvas);
}
} else {
for (size_t i = 0; i < params.pages.size(); ++i) {
page_params.page_number = params.pages[i];
delete canvas;
PrintPage(page_params, canvas_size, frame, &metafile, &canvas);
}
}
}
delete canvas;
metafile.Close();
// Get the size of the resulting metafile.
uint32 buf_size = metafile.GetDataSize();
DCHECK_GT(buf_size, 0u);
#if defined(OS_CHROMEOS)
int sequence_number = -1;
base::FileDescriptor fd;
// Ask the browser to open a file for us.
if (!Send(new ViewHostMsg_AllocateTempFileForPrinting(&fd,
&sequence_number))) {
return;
}
if (!metafile.SaveTo(fd))
return;
// Tell the browser we've finished writing the file.
Send(new ViewHostMsg_TempFileForPrintingWritten(sequence_number));
#else
ViewHostMsg_DidPrintPage_Params printed_page_params;
printed_page_params.data_size = 0;
printed_page_params.document_cookie = params.params.document_cookie;
base::SharedMemoryHandle shared_mem_handle;
if (!Send(new ViewHostMsg_AllocateSharedMemoryBuffer(buf_size,
&shared_mem_handle))) {
NOTREACHED() << "AllocateSharedMemoryBuffer failed";
return;
}
if (!base::SharedMemory::IsHandleValid(shared_mem_handle)) {
NOTREACHED() << "AllocateSharedMemoryBuffer returned bad handle";
return;
}
{
base::SharedMemory shared_buf(shared_mem_handle, false);
if (!shared_buf.Map(buf_size)) {
NOTREACHED() << "Map failed";
return;
}
metafile.GetData(shared_buf.memory(), buf_size);
printed_page_params.data_size = buf_size;
shared_buf.GiveToProcess(base::GetCurrentProcessHandle(),
&(printed_page_params.metafile_data_handle));
}
// Send the first page with a valid handle.
printed_page_params.page_number = 0;
Send(new ViewHostMsg_DidPrintPage(routing_id(), printed_page_params));
// Send the rest of the pages with an invalid metafile handle.
printed_page_params.metafile_data_handle.fd = -1;
if (params.pages.empty()) {
for (int i = 1; i < page_count; ++i) {
printed_page_params.page_number = i;
Send(new ViewHostMsg_DidPrintPage(routing_id(), printed_page_params));
}
} else {
for (size_t i = 1; i < params.pages.size(); ++i) {
printed_page_params.page_number = params.pages[i];
Send(new ViewHostMsg_DidPrintPage(routing_id(), printed_page_params));
}
}
#endif // defined(OS_CHROMEOS)
}
void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame,
printing::NativeMetafile* metafile,
skia::VectorCanvas** canvas) {
double content_width_in_points;
double content_height_in_points;
double margin_top_in_points;
double margin_right_in_points;
double margin_bottom_in_points;
double margin_left_in_points;
GetPageSizeAndMarginsInPoints(frame,
params.page_number,
params.params,
&content_width_in_points,
&content_height_in_points,
&margin_top_in_points,
&margin_right_in_points,
&margin_bottom_in_points,
&margin_left_in_points);
cairo_t* cairo_context =
metafile->StartPage(content_width_in_points,
content_height_in_points,
margin_top_in_points,
margin_right_in_points,
margin_bottom_in_points,
margin_left_in_points);
if (!cairo_context)
return;
*canvas = new skia::VectorCanvas(cairo_context,
canvas_size.width(),
canvas_size.height());
frame->printPage(params.page_number, *canvas);
// TODO(myhuang): We should handle transformation for paper margins.
// TODO(myhuang): We should render the header and the footer.
// Done printing. Close the device context to retrieve the compiled metafile.
if (!metafile->FinishPage())
NOTREACHED() << "metafile failed";
}
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