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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/public/renderer/render_thread.h"
#include "printing/metafile.h"
#include "printing/metafile_impl.h"
#include "printing/metafile_skia_wrapper.h"
#include "printing/page_size_margins.h"
#include "skia/ext/platform_device.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"
#if !defined(OS_CHROMEOS)
#include "base/process_util.h"
#endif // !defined(OS_CHROMEOS)
using WebKit::WebFrame;
using WebKit::WebNode;
bool PrintWebViewHelper::RenderPreviewPage(int page_number) {
PrintMsg_PrintPage_Params page_params;
page_params.params = print_preview_context_.print_params();
page_params.page_number = page_number;
scoped_ptr<printing::Metafile> draft_metafile;
printing::Metafile* initial_render_metafile =
print_preview_context_.metafile();
if (print_preview_context_.IsModifiable() && is_print_ready_metafile_sent_) {
draft_metafile.reset(new printing::PreviewMetafile);
initial_render_metafile = draft_metafile.get();
}
base::TimeTicks begin_time = base::TimeTicks::Now();
PrintPageInternal(page_params,
print_preview_context_.GetPrintCanvasSize(),
print_preview_context_.frame(), initial_render_metafile);
print_preview_context_.RenderedPreviewPage(
base::TimeTicks::Now() - begin_time);
if (draft_metafile.get()) {
draft_metafile->FinishDocument();
} else if (print_preview_context_.IsModifiable() &&
print_preview_context_.generate_draft_pages()){
DCHECK(!draft_metafile.get());
draft_metafile.reset(
print_preview_context_.metafile()->GetMetafileForCurrentPage());
}
return PreviewPageRendered(page_number, draft_metafile.get());
}
bool PrintWebViewHelper::PrintPages(const PrintMsg_PrintPages_Params& params,
WebFrame* frame,
const WebNode& node) {
printing::NativeMetafile metafile;
if (!metafile.Init())
return false;
PrepareFrameAndViewForPrint prep_frame_view(params.params, frame, node);
int page_count = 0;
if (!RenderPages(params, frame, node, &page_count, &prep_frame_view,
&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 =
content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(buf_size);
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,
const WebKit::WebNode& node,
int* page_count,
PrepareFrameAndViewForPrint* prepare,
printing::Metafile* metafile) {
PrintMsg_Print_Params print_params = params.params;
UpdatePrintableSizeInPrintParameters(frame, node, prepare, &print_params);
*page_count = prepare->GetExpectedPageCount();
if (!*page_count)
return false;
#if !defined(OS_CHROMEOS)
Send(new PrintHostMsg_DidGetPrintedPagesCount(routing_id(),
print_params.document_cookie,
*page_count));
#endif
PrintMsg_PrintPage_Params page_params;
page_params.params = print_params;
const gfx::Size& canvas_size = prepare->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);
}
}
prepare->FinishPrinting();
metafile->FinishDocument();
return true;
}
void PrintWebViewHelper::PrintPageInternal(
const PrintMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame,
printing::Metafile* metafile) {
printing::PageSizeMargins page_layout_in_points;
GetPageSizeAndMarginsInPoints(frame, params.page_number, params.params,
&page_layout_in_points);
gfx::Size page_size(
page_layout_in_points.content_width +
page_layout_in_points.margin_right +
page_layout_in_points.margin_left,
page_layout_in_points.content_height +
page_layout_in_points.margin_top +
page_layout_in_points.margin_bottom);
gfx::Rect content_area(page_layout_in_points.margin_left,
page_layout_in_points.margin_top,
page_layout_in_points.content_width,
page_layout_in_points.content_height);
SkDevice* 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, metafile);
skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
frame->printPage(params.page_number, canvas.get());
if (params.params.display_header_footer) {
// |page_number| is 0-based, so 1 is added.
// The scale factor on Linux is 1.
PrintHeaderAndFooter(canvas.get(), params.page_number + 1,
print_preview_context_.total_page_count(), 1,
page_layout_in_points, *header_footer_info_);
}
// Done printing. Close the device context to retrieve the compiled metafile.
if (!metafile->FinishPage())
NOTREACHED() << "metafile failed";
}
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