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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"
#import <AppKit/AppKit.h>
#include "base/logging.h"
#include "base/mac/scoped_nsautorelease_pool.h"
#include "base/metrics/histogram.h"
#include "chrome/common/print_messages.h"
#include "printing/metafile.h"
#include "printing/metafile_impl.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
using WebKit::WebFrame;
void PrintWebViewHelper::PrintPageInternal(
const PrintMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame) {
printing::NativeMetafile metafile;
if (!metafile.Init())
return;
float scale_factor = frame->getPrintPageShrink(params.page_number);
int page_number = params.page_number;
// Render page for printing.
gfx::Rect content_area(params.params.printable_size);
RenderPage(params.params.printable_size, content_area, scale_factor,
page_number, frame, &metafile);
metafile.FinishDocument();
PrintHostMsg_DidPrintPage_Params page_params;
page_params.data_size = metafile.GetDataSize();
page_params.page_number = page_number;
page_params.document_cookie = params.params.document_cookie;
page_params.actual_shrink = scale_factor;
page_params.page_size = params.params.page_size;
page_params.content_area = gfx::Rect(params.params.margin_left,
params.params.margin_top,
params.params.printable_size.width(),
params.params.printable_size.height());
// Ask the browser to create the shared memory for us.
if (!CopyMetafileDataToSharedMem(&metafile,
&(page_params.metafile_data_handle))) {
page_params.data_size = 0;
}
Send(new PrintHostMsg_DidPrintPage(routing_id(), page_params));
}
bool PrintWebViewHelper::CreatePreviewDocument(
const PrintMsg_PrintPages_Params& params, WebKit::WebFrame* frame,
WebKit::WebNode* node) {
PrintMsg_Print_Params printParams = params.params;
UpdatePrintableSizeInPrintParameters(frame, node, &printParams);
PrepareFrameAndViewForPrint prep_frame_view(printParams,
frame, node, frame->view());
int page_count = prep_frame_view.GetExpectedPageCount();
if (!page_count)
return false;
printing::PreviewMetafile metafile;
if (!metafile.Init())
return false;
float scale_factor = frame->getPrintPageShrink(0);
gfx::Rect content_area(printParams.margin_left, printParams.margin_top,
printParams.printable_size.width(),
printParams.printable_size.height());
// Record the begin time.
base::TimeTicks begin_time = base::TimeTicks::Now();
if (params.pages.empty()) {
for (int i = 0; i < page_count; ++i) {
RenderPage(printParams.page_size, content_area, scale_factor, i, frame,
&metafile);
}
} else {
for (size_t i = 0; i < params.pages.size(); ++i) {
if (params.pages[i] >= page_count)
break;
RenderPage(printParams.page_size, content_area, scale_factor,
static_cast<int>(params.pages[i]), frame, &metafile);
}
}
// 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);
metafile.FinishDocument();
PrintHostMsg_DidPreviewDocument_Params preview_params;
preview_params.data_size = metafile.GetDataSize();
preview_params.document_cookie = params.params.document_cookie;
preview_params.expected_pages_count = page_count;
preview_params.modifiable = IsModifiable(frame, node);
// Ask the browser to create the shared memory for us.
if (!CopyMetafileDataToSharedMem(&metafile,
&(preview_params.metafile_data_handle))) {
return false;
}
Send(new PrintHostMsg_PagesReadyForPreview(routing_id(), preview_params));
return true;
}
void PrintWebViewHelper::RenderPage(
const gfx::Size& page_size, const gfx::Rect& content_area,
const float& scale_factor, int page_number, WebFrame* frame,
printing::Metafile* metafile) {
bool success = metafile->StartPage(page_size, content_area, scale_factor);
DCHECK(success);
// printPage can create autoreleased references to |context|. PDF contexts
// don't write all their data until they are destroyed, so we need to make
// certain that there are no lingering references.
{
base::mac::ScopedNSAutoreleasePool pool;
frame->printPage(page_number, metafile->context());
}
// Done printing. Close the device context to retrieve the compiled metafile.
metafile->FinishPage();
}
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