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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 "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.h"
#include "chrome/common/print_messages.h"
#include "content/common/view_messages.h"
#include "printing/metafile.h"
#include "printing/metafile_impl.h"
#include "printing/metafile_skia_wrapper.h"
#include "skia/ext/vector_canvas.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "ui/gfx/point.h"
#if !defined(OS_CHROMEOS)
#include "base/process_util.h"
#endif // !defined(OS_CHROMEOS)
using WebKit::WebFrame;
using WebKit::WebNode;
bool PrintWebViewHelper::CreatePreviewDocument(
const PrintMsg_PrintPages_Params& params, WebKit::WebFrame* frame,
WebKit::WebNode* node) {
int page_count = 0;
printing::PreviewMetafile metafile;
if (!metafile.Init())
return false;
// Record the begin time.
base::TimeTicks begin_time = base::TimeTicks::Now();
if (!RenderPages(params, frame, node, false, &page_count, &metafile))
return false;
// Calculate the time taken to render the requested page for preview and add
// the net time in the histogram.
UMA_HISTOGRAM_TIMES("PrintPreview.RenderTime",
base::TimeTicks::Now() - begin_time);
// Get the size of the resulting metafile.
uint32 buf_size = metafile.GetDataSize();
DCHECK_GT(buf_size, 0u);
PrintHostMsg_DidPreviewDocument_Params preview_params;
preview_params.data_size = buf_size;
preview_params.document_cookie = params.params.document_cookie;
preview_params.expected_pages_count = page_count;
preview_params.modifiable = IsModifiable(frame, node);
if (!CopyMetafileDataToSharedMem(&metafile,
&(preview_params.metafile_data_handle))) {
return false;
}
Send(new PrintHostMsg_PagesReadyForPreview(routing_id(), preview_params));
return true;
}
bool PrintWebViewHelper::PrintPages(const PrintMsg_PrintPages_Params& params,
WebFrame* frame,
WebNode* node) {
int page_count = 0;
bool send_expected_page_count =
#if defined(OS_CHROMEOS)
false;
#else
true;
#endif // defined(OS_CHROMEOS)
printing::NativeMetafile metafile;
if (!metafile.Init())
return false;
if (!RenderPages(params, frame, node, send_expected_page_count, &page_count,
&metafile)) {
return false;
}
// 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.
Send(new PrintHostMsg_AllocateTempFileForPrinting(&fd, &sequence_number));
if (!metafile.SaveToFD(fd))
return false;
// Tell the browser we've finished writing the file.
Send(new PrintHostMsg_TempFileForPrintingWritten(sequence_number));
return true;
#else
PrintHostMsg_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;
Send(new ViewHostMsg_AllocateSharedMemoryBuffer(buf_size,
&shared_mem_handle));
if (!base::SharedMemory::IsHandleValid(shared_mem_handle)) {
NOTREACHED() << "AllocateSharedMemoryBuffer returned bad handle";
return false;
}
{
base::SharedMemory shared_buf(shared_mem_handle, false);
if (!shared_buf.Map(buf_size)) {
NOTREACHED() << "Map failed";
return false;
}
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));
}
if (params.pages.empty()) {
// Send the first page with a valid handle.
printed_page_params.page_number = 0;
Send(new PrintHostMsg_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;
for (int i = 1; i < page_count; ++i) {
printed_page_params.page_number = i;
Send(new PrintHostMsg_DidPrintPage(routing_id(), printed_page_params));
}
} else {
// Send the first page with a valid handle.
printed_page_params.page_number = params.pages[0];
Send(new PrintHostMsg_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;
for (size_t i = 1; i < params.pages.size(); ++i) {
printed_page_params.page_number = params.pages[i];
Send(new PrintHostMsg_DidPrintPage(routing_id(), printed_page_params));
}
}
return true;
#endif // defined(OS_CHROMEOS)
}
bool PrintWebViewHelper::RenderPages(const PrintMsg_PrintPages_Params& params,
WebKit::WebFrame* frame,
WebKit::WebNode* node,
bool send_expected_page_count,
int* page_count,
printing::Metafile* metafile) {
PrintMsg_Print_Params printParams = params.params;
UpdatePrintableSizeInPrintParameters(frame, node, &printParams);
PrepareFrameAndViewForPrint prep_frame_view(printParams, frame, node,
frame->view());
*page_count = prep_frame_view.GetExpectedPageCount();
if (send_expected_page_count) {
Send(new PrintHostMsg_DidGetPrintedPagesCount(routing_id(),
printParams.document_cookie,
*page_count));
}
if (!*page_count)
return false;
PrintMsg_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;
PrintPageInternal(page_params, canvas_size, frame, metafile);
}
} else {
for (size_t i = 0; i < params.pages.size(); ++i) {
page_params.page_number = params.pages[i];
PrintPageInternal(page_params, canvas_size, frame, metafile);
}
}
metafile->FinishDocument();
return true;
}
void PrintWebViewHelper::PrintPageInternal(
const PrintMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame,
printing::Metafile* metafile) {
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);
gfx::Size page_size(
content_width_in_points + margin_right_in_points +
margin_left_in_points,
content_height_in_points + margin_top_in_points +
margin_bottom_in_points);
gfx::Rect content_area(margin_left_in_points, margin_top_in_points,
content_width_in_points, content_height_in_points);
skia::PlatformDevice* device = metafile->StartPageForVectorCanvas(
page_size, content_area, 1.0f);
if (!device)
return;
// The printPage method take a reference to the canvas we pass down, so it
// can't be a stack object.
SkRefPtr<skia::VectorCanvas> canvas = new skia::VectorCanvas(device);
canvas->unref(); // SkRefPtr and new both took a reference.
printing::MetafileSkiaWrapper::SetMetafileOnCanvas(canvas.get(), metafile);
frame->printPage(params.page_number, canvas.get());
// 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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