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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 "printing/page_size_margins.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#if defined(USE_SKIA)
#include "printing/metafile_skia_wrapper.h"
#include "skia/ext/platform_device.h"
#include "skia/ext/vector_canvas.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCanvas.h"
#endif
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;
int page_number = params.page_number;
gfx::Size page_size_in_dpi;
gfx::Rect content_area_in_dpi;
RenderPage(print_pages_params_->params, page_number, frame, false, &metafile,
&page_size_in_dpi, &content_area_in_dpi);
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.page_size = page_size_in_dpi;
page_params.content_area = content_area_in_dpi;
// 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::RenderPreviewPage(int page_number) {
PrintMsg_Print_Params printParams = print_preview_context_.print_params();
scoped_ptr<printing::Metafile> draft_metafile;
printing::Metafile* initial_render_metafile =
print_preview_context_.metafile();
#if defined(USE_SKIA)
bool render_to_draft = print_preview_context_.IsModifiable() &&
is_print_ready_metafile_sent_;
#else
// If the page needs to be in both draft metafile and print ready metafile,
// we should always render to the draft metafile first and then copy that
// into the print ready metafile because CG does not allow us to do it in
// the other order.
bool render_to_draft = print_preview_context_.IsModifiable() &&
print_preview_context_.generate_draft_pages();
#endif
if (render_to_draft) {
draft_metafile.reset(new printing::PreviewMetafile());
if (!draft_metafile->Init()) {
print_preview_context_.set_error(
PREVIEW_ERROR_MAC_DRAFT_METAFILE_INIT_FAILED);
LOG(ERROR) << "Draft PreviewMetafile Init failed";
return false;
}
initial_render_metafile = draft_metafile.get();
}
base::TimeTicks begin_time = base::TimeTicks::Now();
gfx::Size page_size;
RenderPage(printParams, page_number, print_preview_context_.frame(), true,
initial_render_metafile, &page_size, NULL);
print_preview_context_.RenderedPreviewPage(
base::TimeTicks::Now() - begin_time);
if (draft_metafile.get()) {
draft_metafile->FinishDocument();
#if !defined(USE_SKIA)
if (!is_print_ready_metafile_sent_) {
// With CG, we rendered into a new metafile so we could get it as a draft
// document. Now we need to add it to print ready document. But the
// document has already been scaled and adjusted for margins, so do a 1:1
// drawing.
printing::Metafile* print_ready_metafile =
print_preview_context_.metafile();
bool success = print_ready_metafile->StartPage(page_size,
gfx::Rect(page_size), 1.0);
DCHECK(success);
// StartPage unconditionally flips the content over, flip it back since it
// was already flipped in |draft_metafile|.
CGContextTranslateCTM(print_ready_metafile->context(), 0,
page_size.height());
CGContextScaleCTM(print_ready_metafile->context(), 1.0, -1.0);
draft_metafile->RenderPage(1,
print_ready_metafile->context(),
draft_metafile->GetPageBounds(1).ToCGRect(),
false /* shrink_to_fit */,
false /* stretch_to_fit */,
true /* center_horizontally */,
true /* center_vertically */);
print_ready_metafile->FinishPage();
}
#endif
} else {
#if defined(USE_SKIA)
if (print_preview_context_.IsModifiable() &&
print_preview_context_.generate_draft_pages()) {
DCHECK(!draft_metafile.get());
draft_metafile.reset(
print_preview_context_.metafile()->GetMetafileForCurrentPage());
}
#endif
}
return PreviewPageRendered(page_number, draft_metafile.get());
}
void PrintWebViewHelper::RenderPage(
const PrintMsg_Print_Params& params, int page_number, WebFrame* frame,
bool is_preview, printing::Metafile* metafile, gfx::Size* page_size,
gfx::Rect* content_rect) {
double scale_factor = 1.0f;
double webkit_shrink_factor = frame->getPrintPageShrink(page_number);
printing::PageSizeMargins page_layout_in_points;
gfx::Rect content_area;
ComputePageLayoutInPointsForCss(frame, page_number, params,
ignore_css_margins_, fit_to_page_,
&scale_factor, &page_layout_in_points);
GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, page_size,
&content_area);
if (content_rect)
*content_rect = content_area;
scale_factor *= webkit_shrink_factor;
{
#if defined(USE_SKIA)
SkDevice* device = metafile->StartPageForVectorCanvas(
*page_size, content_area, scale_factor);
if (!device)
return;
SkRefPtr<skia::VectorCanvas> canvas = new skia::VectorCanvas(device);
canvas->unref(); // SkRefPtr and new both took a reference.
WebKit::WebCanvas* canvas_ptr = canvas.get();
printing::MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
skia::SetIsPreviewMetafile(*canvas, is_preview);
#else
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;
CGContextRef cgContext = metafile->context();
CGContextRef canvas_ptr = cgContext;
// For CoreGraphics, print in the margins before printing in the content
// area so that we don't spill over. Webkit draws a white background in the
// content area and this acts as a clip.
// TODO(aayushkumar): Combine the calls to PrintHeaderAndFooter once we
// can draw in the margins safely in Skia in any order.
if (print_pages_params_->params.display_header_footer) {
PrintHeaderAndFooter(canvas_ptr, page_number + 1,
print_preview_context_.total_page_count(),
scale_factor, page_layout_in_points,
*header_footer_info_);
}
#endif // !USE_SKIA
frame->printPage(page_number, canvas_ptr);
#if defined(USE_SKIA)
if (print_pages_params_->params.display_header_footer) {
// |page_number| is 0-based, so 1 is added.
PrintHeaderAndFooter(canvas_ptr, page_number + 1,
print_preview_context_.total_page_count(),
scale_factor, page_layout_in_points,
*header_footer_info_);
}
#endif // defined(USE_SKIA)
}
// Done printing. Close the device context to retrieve the compiled metafile.
metafile->FinishPage();
}
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