blob: e05aa794c49004e6973a1221795d1a3ce134664f [file] [log] [blame]
// Copyright (c) 2012 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 "components/printing/renderer/print_render_frame_helper.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <memory>
#include <string>
#include <utility>
#include "base/auto_reset.h"
#include "base/json/json_writer.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/metrics/histogram_macros.h"
#include "base/process/process_handle.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "build/build_config.h"
#include "components/grit/components_resources.h"
#include "components/printing/common/print_messages.h"
#include "content/public/common/web_preferences.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_thread.h"
#include "content/public/renderer/render_view.h"
#include "mojo/public/cpp/system/buffer.h"
#include "mojo/public/cpp/system/platform_handle.h"
#include "net/base/escape.h"
#include "printing/features/features.h"
#include "printing/metafile_skia_wrapper.h"
#include "printing/pdf_metafile_skia.h"
#include "printing/units.h"
#include "third_party/WebKit/common/page/page_visibility_state.mojom.h"
#include "third_party/WebKit/common/sandbox_flags.h"
#include "third_party/WebKit/public/platform/Platform.h"
#include "third_party/WebKit/public/platform/WebDoubleSize.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/platform/WebURLRequest.h"
#include "third_party/WebKit/public/web/WebConsoleMessage.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElement.h"
#include "third_party/WebKit/public/web/WebFrameClient.h"
#include "third_party/WebKit/public/web/WebFrameOwnerProperties.h"
#include "third_party/WebKit/public/web/WebFrameWidget.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
#include "third_party/WebKit/public/web/WebPlugin.h"
#include "third_party/WebKit/public/web/WebPluginDocument.h"
#include "third_party/WebKit/public/web/WebPrintParams.h"
#include "third_party/WebKit/public/web/WebPrintPresetOptions.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "third_party/WebKit/public/web/WebSettings.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "third_party/WebKit/public/web/WebViewClient.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "ui/base/resource/resource_bundle.h"
using content::WebPreferences;
namespace printing {
namespace {
#define STATIC_ASSERT_ENUM(a, b) \
static_assert(static_cast<int>(a) == static_cast<int>(b), \
"mismatching enums: " #a)
// Check blink and printing enums are kept in sync.
STATIC_ASSERT_ENUM(blink::kWebUnknownDuplexMode, UNKNOWN_DUPLEX_MODE);
STATIC_ASSERT_ENUM(blink::kWebSimplex, SIMPLEX);
STATIC_ASSERT_ENUM(blink::kWebLongEdge, LONG_EDGE);
STATIC_ASSERT_ENUM(blink::kWebShortEdge, SHORT_EDGE);
enum PrintPreviewHelperEvents {
PREVIEW_EVENT_REQUESTED,
PREVIEW_EVENT_CACHE_HIT, // Unused
PREVIEW_EVENT_CREATE_DOCUMENT,
PREVIEW_EVENT_NEW_SETTINGS, // Unused
PREVIEW_EVENT_MAX,
};
const double kMinDpi = 1.0;
// Also set in third_party/WebKit/Source/core/page/PrintContext.h
const float kPrintingMinimumShrinkFactor = 1.33333333f;
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
bool g_is_preview_enabled = true;
#else
bool g_is_preview_enabled = false;
#endif
const char kPageLoadScriptFormat[] =
"document.open(); document.write(%s); document.close();";
const char kPageSetupScriptFormat[] = "setup(%s);";
void ExecuteScript(blink::WebLocalFrame* frame,
const char* script_format,
const base::Value& parameters) {
std::string json;
base::JSONWriter::Write(parameters, &json);
std::string script = base::StringPrintf(script_format, json.c_str());
frame->ExecuteScript(blink::WebString::FromUTF8(script));
}
int GetDPI(const PrintMsg_Print_Params* print_params) {
#if defined(OS_MACOSX)
// On the Mac, the printable area is in points, don't do any scaling based
// on dpi.
return kPointsPerInch;
#else
return static_cast<int>(print_params->dpi);
#endif // defined(OS_MACOSX)
}
bool PrintMsg_Print_Params_IsValid(const PrintMsg_Print_Params& params) {
return !params.content_size.IsEmpty() && !params.page_size.IsEmpty() &&
!params.printable_area.IsEmpty() && params.document_cookie &&
params.dpi && params.margin_top >= 0 && params.margin_left >= 0 &&
params.dpi > kMinDpi && params.document_cookie != 0;
}
// Helper function to check for fit to page
bool IsWebPrintScalingOptionFitToPage(const PrintMsg_Print_Params& params) {
return params.print_scaling_option ==
blink::kWebPrintScalingOptionFitToPrintableArea;
}
PrintMsg_Print_Params GetCssPrintParams(
blink::WebLocalFrame* frame,
int page_index,
const PrintMsg_Print_Params& page_params) {
PrintMsg_Print_Params page_css_params = page_params;
int dpi = GetDPI(&page_params);
blink::WebDoubleSize page_size_in_pixels(
ConvertUnitDouble(page_params.page_size.width(), dpi, kPixelsPerInch),
ConvertUnitDouble(page_params.page_size.height(), dpi, kPixelsPerInch));
int margin_top_in_pixels =
ConvertUnit(page_params.margin_top, dpi, kPixelsPerInch);
int margin_right_in_pixels = ConvertUnit(
page_params.page_size.width() - page_params.content_size.width() -
page_params.margin_left,
dpi, kPixelsPerInch);
int margin_bottom_in_pixels = ConvertUnit(
page_params.page_size.height() - page_params.content_size.height() -
page_params.margin_top,
dpi, kPixelsPerInch);
int margin_left_in_pixels =
ConvertUnit(page_params.margin_left, dpi, kPixelsPerInch);
if (frame) {
frame->PageSizeAndMarginsInPixels(
page_index, page_size_in_pixels, margin_top_in_pixels,
margin_right_in_pixels, margin_bottom_in_pixels, margin_left_in_pixels);
}
double new_content_width = page_size_in_pixels.Width() -
margin_left_in_pixels - margin_right_in_pixels;
double new_content_height = page_size_in_pixels.Height() -
margin_top_in_pixels - margin_bottom_in_pixels;
// Invalid page size and/or margins. We just use the default setting.
if (new_content_width < 1 || new_content_height < 1) {
CHECK(frame != nullptr);
page_css_params = GetCssPrintParams(nullptr, page_index, page_params);
return page_css_params;
}
page_css_params.page_size =
gfx::Size(ConvertUnit(page_size_in_pixels.Width(), kPixelsPerInch, dpi),
ConvertUnit(page_size_in_pixels.Height(), kPixelsPerInch, dpi));
page_css_params.content_size =
gfx::Size(ConvertUnit(new_content_width, kPixelsPerInch, dpi),
ConvertUnit(new_content_height, kPixelsPerInch, dpi));
page_css_params.margin_top =
ConvertUnit(margin_top_in_pixels, kPixelsPerInch, dpi);
page_css_params.margin_left =
ConvertUnit(margin_left_in_pixels, kPixelsPerInch, dpi);
return page_css_params;
}
double FitPrintParamsToPage(const PrintMsg_Print_Params& page_params,
PrintMsg_Print_Params* params_to_fit) {
double content_width =
static_cast<double>(params_to_fit->content_size.width());
double content_height =
static_cast<double>(params_to_fit->content_size.height());
int default_page_size_height = page_params.page_size.height();
int default_page_size_width = page_params.page_size.width();
int css_page_size_height = params_to_fit->page_size.height();
int css_page_size_width = params_to_fit->page_size.width();
double scale_factor = 1.0f;
if (page_params.page_size == params_to_fit->page_size)
return scale_factor;
if (default_page_size_width < css_page_size_width ||
default_page_size_height < css_page_size_height) {
double ratio_width =
static_cast<double>(default_page_size_width) / css_page_size_width;
double ratio_height =
static_cast<double>(default_page_size_height) / css_page_size_height;
scale_factor = ratio_width < ratio_height ? ratio_width : ratio_height;
content_width *= scale_factor;
content_height *= scale_factor;
}
params_to_fit->margin_top = static_cast<int>(
(default_page_size_height - css_page_size_height * scale_factor) / 2 +
(params_to_fit->margin_top * scale_factor));
params_to_fit->margin_left = static_cast<int>(
(default_page_size_width - css_page_size_width * scale_factor) / 2 +
(params_to_fit->margin_left * scale_factor));
params_to_fit->content_size = gfx::Size(static_cast<int>(content_width),
static_cast<int>(content_height));
params_to_fit->page_size = page_params.page_size;
return scale_factor;
}
void CalculatePageLayoutFromPrintParams(
const PrintMsg_Print_Params& params,
double scale_factor,
PageSizeMargins* page_layout_in_points) {
bool fit_to_page = IsWebPrintScalingOptionFitToPage(params);
int dpi = GetDPI(&params);
int content_width = params.content_size.width();
int content_height = params.content_size.height();
// Scale the content to its normal size for purpose of computing page layout.
// Otherwise we will get negative margins.
bool scale = fit_to_page || params.print_to_pdf;
if (scale && scale_factor >= PrintRenderFrameHelper::kEpsilon) {
content_width =
static_cast<int>(static_cast<double>(content_width) * scale_factor);
content_height =
static_cast<int>(static_cast<double>(content_height) * scale_factor);
}
int margin_bottom =
params.page_size.height() - content_height - params.margin_top;
int margin_right =
params.page_size.width() - content_width - params.margin_left;
page_layout_in_points->content_width =
ConvertUnit(content_width, dpi, kPointsPerInch);
page_layout_in_points->content_height =
ConvertUnit(content_height, dpi, kPointsPerInch);
page_layout_in_points->margin_top =
ConvertUnit(params.margin_top, dpi, kPointsPerInch);
page_layout_in_points->margin_right =
ConvertUnit(margin_right, dpi, kPointsPerInch);
page_layout_in_points->margin_bottom =
ConvertUnit(margin_bottom, dpi, kPointsPerInch);
page_layout_in_points->margin_left =
ConvertUnit(params.margin_left, dpi, kPointsPerInch);
}
void EnsureOrientationMatches(const PrintMsg_Print_Params& css_params,
PrintMsg_Print_Params* page_params) {
if ((page_params->page_size.width() > page_params->page_size.height()) ==
(css_params.page_size.width() > css_params.page_size.height())) {
return;
}
// Swap the |width| and |height| values.
page_params->page_size.SetSize(page_params->page_size.height(),
page_params->page_size.width());
page_params->content_size.SetSize(page_params->content_size.height(),
page_params->content_size.width());
page_params->printable_area.set_size(
gfx::Size(page_params->printable_area.height(),
page_params->printable_area.width()));
}
void ComputeWebKitPrintParamsInDesiredDpi(
const PrintMsg_Print_Params& print_params,
blink::WebPrintParams* webkit_print_params) {
int dpi = GetDPI(&print_params);
webkit_print_params->printer_dpi = dpi;
webkit_print_params->rasterize_pdf = print_params.rasterize_pdf;
webkit_print_params->print_scaling_option = print_params.print_scaling_option;
webkit_print_params->print_content_area.width =
ConvertUnit(print_params.content_size.width(), dpi, kPointsPerInch);
webkit_print_params->print_content_area.height =
ConvertUnit(print_params.content_size.height(), dpi, kPointsPerInch);
webkit_print_params->printable_area.x =
ConvertUnit(print_params.printable_area.x(), dpi, kPointsPerInch);
webkit_print_params->printable_area.y =
ConvertUnit(print_params.printable_area.y(), dpi, kPointsPerInch);
webkit_print_params->printable_area.width =
ConvertUnit(print_params.printable_area.width(), dpi, kPointsPerInch);
webkit_print_params->printable_area.height =
ConvertUnit(print_params.printable_area.height(), dpi, kPointsPerInch);
webkit_print_params->paper_size.width =
ConvertUnit(print_params.page_size.width(), dpi, kPointsPerInch);
webkit_print_params->paper_size.height =
ConvertUnit(print_params.page_size.height(), dpi, kPointsPerInch);
}
blink::WebPlugin* GetPlugin(const blink::WebLocalFrame* frame) {
return frame->GetDocument().IsPluginDocument()
? frame->GetDocument().To<blink::WebPluginDocument>().Plugin()
: nullptr;
}
bool PrintingNodeOrPdfFrame(const blink::WebLocalFrame* frame,
const blink::WebNode& node) {
if (!node.IsNull())
return true;
blink::WebPlugin* plugin = GetPlugin(frame);
return plugin && plugin->SupportsPaginatedPrint();
}
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
// Returns true if the current destination printer is PRINT_TO_PDF.
bool IsPrintToPdfRequested(const base::DictionaryValue& job_settings) {
bool print_to_pdf = false;
if (!job_settings.GetBoolean(kSettingPrintToPDF, &print_to_pdf))
NOTREACHED();
return print_to_pdf;
}
bool PrintingFrameHasPageSizeStyle(blink::WebLocalFrame* frame,
int total_page_count) {
if (!frame)
return false;
bool frame_has_custom_page_size_style = false;
for (int i = 0; i < total_page_count; ++i) {
if (frame->HasCustomPageSizeStyle(i)) {
frame_has_custom_page_size_style = true;
break;
}
}
return frame_has_custom_page_size_style;
}
#endif // BUILDFLAG(ENABLE_PRINT_PREVIEW)
#if BUILDFLAG(ENABLE_PRINTING)
// Disable scaling when either:
// - The PDF specifies disabling scaling.
// - All the pages in the PDF are the same size,
// - |ignore_page_size| is false and the uniform size is the same as the paper
// size.
bool PDFShouldDisableScalingBasedOnPreset(
const blink::WebPrintPresetOptions& options,
const PrintMsg_Print_Params& params,
bool ignore_page_size) {
if (options.is_scaling_disabled)
return true;
if (!options.is_page_size_uniform)
return false;
int dpi = GetDPI(&params);
if (!dpi) {
// Likely |params| is invalid, in which case the return result does not
// matter. Check for this so ConvertUnit() does not divide by zero.
return true;
}
if (ignore_page_size)
return false;
blink::WebSize page_size(
ConvertUnit(params.page_size.width(), dpi, kPointsPerInch),
ConvertUnit(params.page_size.height(), dpi, kPointsPerInch));
return options.uniform_page_size == page_size;
}
bool PDFShouldDisableScaling(blink::WebLocalFrame* frame,
const blink::WebNode& node,
const PrintMsg_Print_Params& params,
bool ignore_page_size) {
const bool kDefaultPDFShouldDisableScalingSetting = true;
blink::WebPrintPresetOptions preset_options;
if (!frame->GetPrintPresetOptionsForPlugin(node, &preset_options))
return kDefaultPDFShouldDisableScalingSetting;
return PDFShouldDisableScalingBasedOnPreset(preset_options, params,
ignore_page_size);
}
#endif
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
MarginType GetMarginsForPdf(blink::WebLocalFrame* frame,
const blink::WebNode& node,
const PrintMsg_Print_Params& params) {
return PDFShouldDisableScaling(frame, node, params, false)
? NO_MARGINS
: PRINTABLE_AREA_MARGINS;
}
#endif
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
bool FitToPageEnabled(const base::DictionaryValue& job_settings) {
bool fit_to_paper_size = false;
if (!job_settings.GetBoolean(kSettingFitToPageEnabled, &fit_to_paper_size)) {
NOTREACHED();
}
return fit_to_paper_size;
}
// Returns the print scaling option to retain/scale/crop the source page size
// to fit the printable area of the paper.
//
// We retain the source page size when the current destination printer is
// SAVE_AS_PDF.
//
// We crop the source page size to fit the printable area or we print only the
// left top page contents when
// (1) Source is PDF and the user has requested not to fit to printable area
// via |job_settings|.
// (2) Source is PDF. This is the first preview request and print scaling
// option is disabled for initiator renderer plugin.
//
// In all other cases, we scale the source page to fit the printable area.
blink::WebPrintScalingOption GetPrintScalingOption(
blink::WebLocalFrame* frame,
const blink::WebNode& node,
bool source_is_html,
const base::DictionaryValue& job_settings,
const PrintMsg_Print_Params& params) {
if (params.print_to_pdf)
return blink::kWebPrintScalingOptionSourceSize;
if (!source_is_html) {
if (!FitToPageEnabled(job_settings))
return blink::kWebPrintScalingOptionNone;
bool no_plugin_scaling = PDFShouldDisableScaling(frame, node, params, true);
if (params.is_first_request && no_plugin_scaling)
return blink::kWebPrintScalingOptionNone;
}
return blink::kWebPrintScalingOptionFitToPrintableArea;
}
#endif // BUILDFLAG(ENABLE_PRINT_PREVIEW)
// Helper function to scale and round an integer value with a double valued
// scaling.
int ScaleAndRound(int value, double scaling) {
return static_cast<int>(static_cast<double>(value) / scaling);
}
// Helper function to scale the width and height of a gfx::Size by scaling.
gfx::Size ScaleAndRoundSize(gfx::Size original, double scaling) {
return gfx::Size(ScaleAndRound(original.width(), scaling),
ScaleAndRound(original.height(), scaling));
}
PrintMsg_Print_Params CalculatePrintParamsForCss(
blink::WebLocalFrame* frame,
int page_index,
const PrintMsg_Print_Params& page_params,
bool ignore_css_margins,
bool fit_to_page,
double* scale_factor) {
PrintMsg_Print_Params css_params =
GetCssPrintParams(frame, page_index, page_params);
PrintMsg_Print_Params params = page_params;
EnsureOrientationMatches(css_params, &params);
params.content_size = ScaleAndRoundSize(params.content_size, *scale_factor);
if (ignore_css_margins && fit_to_page)
return params;
PrintMsg_Print_Params result_params = css_params;
// If not printing a pdf or fitting to page, scale the page size.
bool scale = !params.print_to_pdf;
double page_scaling = scale ? *scale_factor : 1.0f;
if (!fit_to_page) {
result_params.page_size =
ScaleAndRoundSize(result_params.page_size, page_scaling);
}
if (ignore_css_margins) {
// Since not fitting to page, scale the page size and margins.
params.margin_left = ScaleAndRound(params.margin_left, page_scaling);
params.margin_top = ScaleAndRound(params.margin_top, page_scaling);
params.page_size = ScaleAndRoundSize(params.page_size, page_scaling);
result_params.margin_top = params.margin_top;
result_params.margin_left = params.margin_left;
DCHECK(!fit_to_page);
// Since we are ignoring the margins, the css page size is no longer
// valid for content.
int default_margin_right = params.page_size.width() -
params.content_size.width() - params.margin_left;
int default_margin_bottom = params.page_size.height() -
params.content_size.height() -
params.margin_top;
result_params.content_size =
gfx::Size(result_params.page_size.width() - result_params.margin_left -
default_margin_right,
result_params.page_size.height() - result_params.margin_top -
default_margin_bottom);
} else {
// Using the CSS parameters. Scale CSS content size.
result_params.content_size =
ScaleAndRoundSize(result_params.content_size, *scale_factor);
if (fit_to_page) {
double factor = FitPrintParamsToPage(params, &result_params);
if (scale_factor)
*scale_factor *= factor;
} else {
// Already scaled the page, need to also scale the CSS margins since they
// are begin applied
result_params.margin_left =
ScaleAndRound(result_params.margin_left, page_scaling);
result_params.margin_top =
ScaleAndRound(result_params.margin_top, page_scaling);
}
}
return result_params;
}
} // namespace
FrameReference::FrameReference(blink::WebLocalFrame* frame) {
Reset(frame);
}
FrameReference::FrameReference() {
Reset(nullptr);
}
FrameReference::~FrameReference() {}
void FrameReference::Reset(blink::WebLocalFrame* frame) {
if (frame) {
view_ = frame->View();
// Make sure this isn't called too early in the |frame| lifecycle... i.e.
// calling this in WebFrameClient::BindToFrame() doesn't work.
// TODO(dcheng): It's a bit awkward that lifetime details like this leak out
// of Blink. Fixing https://crbug.com/727166 should allow this to be
// addressed.
DCHECK(view_);
frame_ = frame;
} else {
view_ = nullptr;
frame_ = nullptr;
}
}
blink::WebLocalFrame* FrameReference::GetFrame() {
if (view_ == nullptr || frame_ == nullptr)
return nullptr;
for (blink::WebFrame* frame = view_->MainFrame(); frame != nullptr;
frame = frame->TraverseNext()) {
if (frame == frame_)
return frame_;
}
return nullptr;
}
blink::WebView* FrameReference::view() {
return view_;
}
// static - Not anonymous so that platform implementations can use it.
void PrintRenderFrameHelper::PrintHeaderAndFooter(
blink::WebCanvas* canvas,
int page_number,
int total_pages,
const blink::WebLocalFrame& source_frame,
float webkit_scale_factor,
const PageSizeMargins& page_layout,
const PrintMsg_Print_Params& params) {
cc::PaintCanvasAutoRestore auto_restore(canvas, true);
canvas->scale(1 / webkit_scale_factor, 1 / webkit_scale_factor);
blink::WebSize page_size(page_layout.margin_left + page_layout.margin_right +
page_layout.content_width,
page_layout.margin_top + page_layout.margin_bottom +
page_layout.content_height);
blink::WebView* web_view = blink::WebView::Create(
/* client = */ nullptr, blink::mojom::PageVisibilityState::kVisible,
/* opener = */ nullptr);
web_view->GetSettings()->SetJavaScriptEnabled(true);
class HeaderAndFooterClient final : public blink::WebFrameClient {
public:
// WebFrameClient:
void BindToFrame(blink::WebLocalFrame* frame) override { frame_ = frame; }
void FrameDetached(DetachType detach_type) override {
frame_->FrameWidget()->Close();
frame_->Close();
frame_ = nullptr;
}
private:
blink::WebLocalFrame* frame_;
};
HeaderAndFooterClient frame_client;
blink::WebLocalFrame* frame = blink::WebLocalFrame::CreateMainFrame(
web_view, &frame_client, nullptr, nullptr);
blink::WebWidgetClient web_widget_client;
blink::WebFrameWidget::Create(&web_widget_client, frame);
base::Value html(base::UTF8ToUTF16(
ui::ResourceBundle::GetSharedInstance().GetRawDataResource(
IDR_PRINT_PREVIEW_PAGE)));
// Load page with script to avoid async operations.
ExecuteScript(frame, kPageLoadScriptFormat, html);
auto options = std::make_unique<base::DictionaryValue>();
options->SetDouble(kSettingHeaderFooterDate, base::Time::Now().ToJsTime());
options->SetDouble("width", page_size.width);
options->SetDouble("height", page_size.height);
options->SetDouble("topMargin", page_layout.margin_top);
options->SetDouble("bottomMargin", page_layout.margin_bottom);
options->SetInteger("pageNumber", page_number);
options->SetInteger("totalPages", total_pages);
options->SetString("url", params.url);
base::string16 title = source_frame.GetDocument().Title().Utf16();
options->SetString("title", title.empty() ? params.title : title);
options->SetString("headerTemplate", params.header_template);
options->SetString("footerTemplate", params.footer_template);
ExecuteScript(frame, kPageSetupScriptFormat, *options);
blink::WebPrintParams webkit_params(page_size);
webkit_params.printer_dpi = GetDPI(&params);
frame->PrintBegin(webkit_params);
frame->PrintPage(0, canvas);
frame->PrintEnd();
web_view->Close();
}
// static - Not anonymous so that platform implementations can use it.
float PrintRenderFrameHelper::RenderPageContent(blink::WebLocalFrame* frame,
int page_number,
const gfx::Rect& canvas_area,
const gfx::Rect& content_area,
double scale_factor,
blink::WebCanvas* canvas) {
cc::PaintCanvasAutoRestore auto_restore(canvas, true);
canvas->translate((content_area.x() - canvas_area.x()) / scale_factor,
(content_area.y() - canvas_area.y()) / scale_factor);
return frame->PrintPage(page_number, canvas);
}
// Class that calls the Begin and End print functions on the frame and changes
// the size of the view temporarily to support full page printing..
class PrepareFrameAndViewForPrint : public blink::WebViewClient,
public blink::WebFrameClient {
public:
PrepareFrameAndViewForPrint(const PrintMsg_Print_Params& params,
blink::WebLocalFrame* frame,
const blink::WebNode& node,
bool ignore_css_margins);
~PrepareFrameAndViewForPrint() override;
// Optional. Replaces |frame_| with selection if needed. Will call |on_ready|
// when completed.
void CopySelectionIfNeeded(const WebPreferences& preferences,
const base::Closure& on_ready);
// Prepares frame for printing.
void StartPrinting();
blink::WebLocalFrame* frame() { return frame_.GetFrame(); }
const blink::WebNode& node() const { return node_to_print_; }
int GetExpectedPageCount() const { return expected_pages_count_; }
void FinishPrinting();
bool IsLoadingSelection() {
// It's not selection if not |owns_web_view_|.
return owns_web_view_ && frame() && frame()->IsLoading();
}
private:
// blink::WebViewClient:
void DidStopLoading() override;
// TODO(ojan): Remove this override and have this class use a non-null
// layerTreeView.
bool AllowsBrokenNullLayerTreeView() const override;
// blink::WebFrameClient:
blink::WebLocalFrame* CreateChildFrame(
blink::WebLocalFrame* parent,
blink::WebTreeScopeType scope,
const blink::WebString& name,
const blink::WebString& fallback_name,
blink::WebSandboxFlags sandbox_flags,
const blink::ParsedFeaturePolicy& container_policy,
const blink::WebFrameOwnerProperties& frame_owner_properties) override;
void FrameDetached(DetachType detach_type) override;
std::unique_ptr<blink::WebURLLoaderFactory> CreateURLLoaderFactory() override;
void CallOnReady();
void ResizeForPrinting();
void RestoreSize();
void CopySelection(const WebPreferences& preferences);
FrameReference frame_;
blink::WebNode node_to_print_;
bool owns_web_view_;
blink::WebPrintParams web_print_params_;
gfx::Size prev_view_size_;
gfx::Size prev_scroll_offset_;
int expected_pages_count_;
base::Closure on_ready_;
bool should_print_backgrounds_;
bool should_print_selection_only_;
bool is_printing_started_;
base::WeakPtrFactory<PrepareFrameAndViewForPrint> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
};
PrepareFrameAndViewForPrint::PrepareFrameAndViewForPrint(
const PrintMsg_Print_Params& params,
blink::WebLocalFrame* frame,
const blink::WebNode& node,
bool ignore_css_margins)
: frame_(frame),
node_to_print_(node),
owns_web_view_(false),
expected_pages_count_(0),
should_print_backgrounds_(params.should_print_backgrounds),
should_print_selection_only_(params.selection_only),
is_printing_started_(false),
weak_ptr_factory_(this) {
PrintMsg_Print_Params print_params = params;
if (!should_print_selection_only_ ||
!PrintingNodeOrPdfFrame(frame, node_to_print_)) {
bool fit_to_page =
ignore_css_margins && IsWebPrintScalingOptionFitToPage(print_params);
ComputeWebKitPrintParamsInDesiredDpi(params, &web_print_params_);
frame->PrintBegin(web_print_params_, node_to_print_);
double scale_factor = 1.0f;
if (print_params.scale_factor >= PrintRenderFrameHelper::kEpsilon)
scale_factor = print_params.scale_factor;
print_params = CalculatePrintParamsForCss(
frame, 0, print_params, ignore_css_margins, fit_to_page, &scale_factor);
frame->PrintEnd();
}
ComputeWebKitPrintParamsInDesiredDpi(print_params, &web_print_params_);
}
PrepareFrameAndViewForPrint::~PrepareFrameAndViewForPrint() {
FinishPrinting();
}
void PrepareFrameAndViewForPrint::ResizeForPrinting() {
// Layout page according to printer page size. Since WebKit shrinks the
// size of the page automatically (from 133.3% to 200%) we trick it to
// think the page is 133.3% larger so the size of the page is correct for
// minimum (default) scaling.
// The scaling factor 1.25 was originally chosen as a magic number that
// was 'about right'. However per https://crbug.com/273306 1.333 seems to be
// the number that produces output with the correct physical size for elements
// that are specified in cm, mm, pt etc.
// This is important for sites that try to fill the page.
gfx::Size print_layout_size(web_print_params_.print_content_area.width,
web_print_params_.print_content_area.height);
print_layout_size.set_height(
ScaleAndRound(print_layout_size.height(), kPrintingMinimumShrinkFactor));
if (!frame())
return;
// Plugins do not need to be resized. Resizing the PDF plugin causes a
// flicker in the top left corner behind the preview. See crbug.com/739973.
if (PrintingNodeOrPdfFrame(frame(), node_to_print_))
return;
// Backup size and offset if it's a local frame.
blink::WebView* web_view = frame_.view();
if (blink::WebFrame* web_frame = web_view->MainFrame()) {
// TODO(lukasza, weili): Support restoring scroll offset of a remote main
// frame - https://crbug.com/734815.
if (web_frame->IsWebLocalFrame())
prev_scroll_offset_ = web_frame->ToWebLocalFrame()->GetScrollOffset();
}
prev_view_size_ = web_view->Size();
web_view->Resize(print_layout_size);
}
void PrepareFrameAndViewForPrint::StartPrinting() {
ResizeForPrinting();
blink::WebView* web_view = frame_.view();
web_view->GetSettings()->SetShouldPrintBackgrounds(should_print_backgrounds_);
expected_pages_count_ =
frame()->PrintBegin(web_print_params_, node_to_print_);
is_printing_started_ = true;
}
void PrepareFrameAndViewForPrint::CopySelectionIfNeeded(
const WebPreferences& preferences,
const base::Closure& on_ready) {
on_ready_ = on_ready;
if (should_print_selection_only_) {
CopySelection(preferences);
} else {
// Call immediately, async call crashes scripting printing.
CallOnReady();
}
}
void PrepareFrameAndViewForPrint::CopySelection(
const WebPreferences& preferences) {
ResizeForPrinting();
std::string url_str = "data:text/html;charset=utf-8,";
url_str.append(
net::EscapeQueryParamValue(frame()->SelectionAsMarkup().Utf8(), false));
RestoreSize();
// Create a new WebView with the same settings as the current display one.
// Except that we disable javascript (don't want any active content running
// on the page).
WebPreferences prefs = preferences;
prefs.javascript_enabled = false;
blink::WebView* web_view = blink::WebView::Create(
/* client = */ this, blink::mojom::PageVisibilityState::kVisible,
/* opener = */ nullptr);
owns_web_view_ = true;
content::RenderView::ApplyWebPreferences(prefs, web_view);
blink::WebLocalFrame* main_frame =
blink::WebLocalFrame::CreateMainFrame(web_view, this, nullptr, nullptr);
frame_.Reset(main_frame);
blink::WebFrameWidget::Create(this, main_frame);
node_to_print_.Reset();
// When loading is done this will call didStopLoading() and that will do the
// actual printing.
blink::WebURLRequest request = blink::WebURLRequest(GURL(url_str));
frame()->LoadRequest(request);
}
bool PrepareFrameAndViewForPrint::AllowsBrokenNullLayerTreeView() const {
return true;
}
void PrepareFrameAndViewForPrint::DidStopLoading() {
DCHECK(!on_ready_.is_null());
// Don't call callback here, because it can delete |this| and WebView that is
// called didStopLoading.
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(&PrepareFrameAndViewForPrint::CallOnReady,
weak_ptr_factory_.GetWeakPtr()));
}
blink::WebLocalFrame* PrepareFrameAndViewForPrint::CreateChildFrame(
blink::WebLocalFrame* parent,
blink::WebTreeScopeType scope,
const blink::WebString& name,
const blink::WebString& fallback_name,
blink::WebSandboxFlags sandbox_flags,
const blink::ParsedFeaturePolicy& container_policy,
const blink::WebFrameOwnerProperties& frame_owner_properties) {
// This is called when printing a selection and when this selection contains
// an iframe. This is not supported yet. An empty rectangle will be displayed
// instead.
// Please see: https://crbug.com/732780.
return nullptr;
}
void PrepareFrameAndViewForPrint::FrameDetached(DetachType detach_type) {
blink::WebLocalFrame* frame = frame_.GetFrame();
DCHECK(frame);
frame->FrameWidget()->Close();
frame->Close();
frame_.Reset(nullptr);
}
std::unique_ptr<blink::WebURLLoaderFactory>
PrepareFrameAndViewForPrint::CreateURLLoaderFactory() {
return blink::Platform::Current()->CreateDefaultURLLoaderFactory();
}
void PrepareFrameAndViewForPrint::CallOnReady() {
return on_ready_.Run(); // Can delete |this|.
}
void PrepareFrameAndViewForPrint::RestoreSize() {
if (!frame())
return;
// Do not restore plugins, since they are not resized.
if (PrintingNodeOrPdfFrame(frame(), node_to_print_))
return;
blink::WebView* web_view = frame_.GetFrame()->View();
web_view->Resize(prev_view_size_);
if (blink::WebFrame* web_frame = web_view->MainFrame()) {
// TODO(lukasza, weili): Support restoring scroll offset of a remote main
// frame - https://crbug.com/734815.
if (web_frame->IsWebLocalFrame())
web_frame->ToWebLocalFrame()->SetScrollOffset(prev_scroll_offset_);
}
}
void PrepareFrameAndViewForPrint::FinishPrinting() {
blink::WebLocalFrame* frame = frame_.GetFrame();
if (frame) {
blink::WebView* web_view = frame->View();
if (is_printing_started_) {
is_printing_started_ = false;
if (!owns_web_view_) {
web_view->GetSettings()->SetShouldPrintBackgrounds(false);
RestoreSize();
}
frame->PrintEnd();
}
if (owns_web_view_) {
DCHECK(!frame->IsLoading());
owns_web_view_ = false;
web_view->Close();
}
}
frame_.Reset(nullptr);
on_ready_.Reset();
}
bool PrintRenderFrameHelper::Delegate::IsScriptedPrintEnabled() {
return true;
}
PrintRenderFrameHelper::PrintRenderFrameHelper(
content::RenderFrame* render_frame,
std::unique_ptr<Delegate> delegate)
: content::RenderFrameObserver(render_frame),
content::RenderFrameObserverTracker<PrintRenderFrameHelper>(render_frame),
reset_prep_frame_view_(false),
is_print_ready_metafile_sent_(false),
ignore_css_margins_(false),
is_printing_enabled_(true),
notify_browser_of_print_failure_(true),
delegate_(std::move(delegate)),
print_node_in_progress_(false),
is_loading_(false),
is_scripted_preview_delayed_(false),
ipc_nesting_level_(0),
render_frame_gone_(false),
weak_ptr_factory_(this) {
if (!delegate_->IsPrintPreviewEnabled())
DisablePreview();
}
PrintRenderFrameHelper::~PrintRenderFrameHelper() {}
// static
void PrintRenderFrameHelper::DisablePreview() {
g_is_preview_enabled = false;
}
bool PrintRenderFrameHelper::IsScriptInitiatedPrintAllowed(
blink::WebLocalFrame* frame,
bool user_initiated) {
if (!is_printing_enabled_ || !delegate_->IsScriptedPrintEnabled())
return false;
// If preview is enabled, then the print dialog is tab modal, and the user
// can always close the tab on a mis-behaving page (the system print dialog
// is app modal). If the print was initiated through user action, don't
// throttle. Or, if the command line flag to skip throttling has been set.
return user_initiated || g_is_preview_enabled ||
scripting_throttler_.IsAllowed(frame);
}
void PrintRenderFrameHelper::DidStartProvisionalLoad(
blink::WebDocumentLoader* document_loader) {
is_loading_ = true;
}
void PrintRenderFrameHelper::DidFailProvisionalLoad(
const blink::WebURLError& error) {
DidFinishLoad();
}
void PrintRenderFrameHelper::DidFinishLoad() {
is_loading_ = false;
if (!on_stop_loading_closure_.is_null()) {
on_stop_loading_closure_.Run();
on_stop_loading_closure_.Reset();
}
}
void PrintRenderFrameHelper::ScriptedPrint(bool user_initiated) {
// Allow Prerendering to cancel this print request if necessary.
if (delegate_->CancelPrerender(render_frame()))
return;
blink::WebLocalFrame* web_frame = render_frame()->GetWebFrame();
if (!IsScriptInitiatedPrintAllowed(web_frame, user_initiated))
return;
if (delegate_->OverridePrint(web_frame))
return;
if (g_is_preview_enabled) {
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
print_preview_context_.InitWithFrame(web_frame);
RequestPrintPreview(PRINT_PREVIEW_SCRIPTED);
#endif
} else {
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
auto weak_this = weak_ptr_factory_.GetWeakPtr();
web_frame->DispatchBeforePrintEvent();
if (!weak_this)
return;
Print(web_frame, blink::WebNode(), true /* is_scripted? */);
if (weak_this)
web_frame->DispatchAfterPrintEvent();
#endif
}
// WARNING: |this| may be gone at this point. Do not do any more work here and
// just return.
}
bool PrintRenderFrameHelper::OnMessageReceived(const IPC::Message& message) {
// The class is not designed to handle recursive messages. This is not
// expected during regular flow. However, during rendering of content for
// printing, lower level code may run nested run loop. E.g. PDF may has
// script to show message box http://crbug.com/502562. In that moment browser
// may receive updated printer capabilities and decide to restart print
// preview generation. When this happened message handling function may
// choose to ignore message or safely crash process.
++ipc_nesting_level_;
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PrintRenderFrameHelper, message)
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
IPC_MESSAGE_HANDLER(PrintMsg_PrintPages, OnPrintPages)
IPC_MESSAGE_HANDLER(PrintMsg_PrintForSystemDialog, OnPrintForSystemDialog)
#endif // BUILDFLAG(ENABLE_BASIC_PRINTING)
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
IPC_MESSAGE_HANDLER(PrintMsg_InitiatePrintPreview, OnInitiatePrintPreview)
IPC_MESSAGE_HANDLER(PrintMsg_PrintPreview, OnPrintPreview)
IPC_MESSAGE_HANDLER(PrintMsg_PrintingDone, OnPrintingDone)
IPC_MESSAGE_HANDLER(PrintMsg_ClosePrintPreviewDialog,
OnClosePrintPreviewDialog)
#endif // BUILDFLAG(ENABLE_PRINT_PREVIEW)
IPC_MESSAGE_HANDLER(PrintMsg_SetPrintingEnabled, OnSetPrintingEnabled)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
--ipc_nesting_level_;
if (ipc_nesting_level_ == 0 && render_frame_gone_)
base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
return handled;
}
void PrintRenderFrameHelper::OnDestruct() {
if (ipc_nesting_level_ > 0) {
render_frame_gone_ = true;
return;
}
delete this;
}
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
void PrintRenderFrameHelper::OnPrintPages() {
if (ipc_nesting_level_ > 1)
return;
auto weak_this = weak_ptr_factory_.GetWeakPtr();
blink::WebLocalFrame* frame = render_frame()->GetWebFrame();
frame->DispatchBeforePrintEvent();
if (!weak_this)
return;
// If we are printing a PDF extension frame, find the plugin node and print
// that instead.
auto plugin = delegate_->GetPdfElement(frame);
Print(frame, plugin, false /* is_scripted? */);
if (weak_this)
frame->DispatchAfterPrintEvent();
// WARNING: |this| may be gone at this point. Do not do any more work here and
// just return.
}
void PrintRenderFrameHelper::OnPrintForSystemDialog() {
if (ipc_nesting_level_ > 1)
return;
blink::WebLocalFrame* frame = print_preview_context_.source_frame();
if (!frame) {
NOTREACHED();
return;
}
auto weak_this = weak_ptr_factory_.GetWeakPtr();
Print(frame, print_preview_context_.source_node(), false);
if (weak_this)
frame->DispatchAfterPrintEvent();
// WARNING: |this| may be gone at this point. Do not do any more work here and
// just return.
}
#endif // BUILDFLAG(ENABLE_BASIC_PRINTING)
void PrintRenderFrameHelper::GetPageSizeAndContentAreaFromPageLayout(
const PageSizeMargins& page_layout_in_points,
gfx::Size* page_size,
gfx::Rect* content_area) {
*page_size = gfx::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);
*content_area = gfx::Rect(page_layout_in_points.margin_left,
page_layout_in_points.margin_top,
page_layout_in_points.content_width,
page_layout_in_points.content_height);
}
void PrintRenderFrameHelper::UpdateFrameMarginsCssInfo(
const base::DictionaryValue& settings) {
int margins_type = 0;
if (!settings.GetInteger(kSettingMarginsType, &margins_type))
margins_type = DEFAULT_MARGINS;
ignore_css_margins_ = (margins_type != DEFAULT_MARGINS);
}
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
void PrintRenderFrameHelper::OnPrintPreview(
const base::DictionaryValue& settings) {
if (ipc_nesting_level_ > 1)
return;
print_preview_context_.OnPrintPreview();
UMA_HISTOGRAM_ENUMERATION("PrintPreview.PreviewEvent",
PREVIEW_EVENT_REQUESTED, PREVIEW_EVENT_MAX);
if (!print_preview_context_.source_frame()) {
DidFinishPrinting(FAIL_PREVIEW);
return;
}
if (!UpdatePrintSettings(print_preview_context_.source_frame(),
print_preview_context_.source_node(), settings)) {
if (print_preview_context_.last_error() != PREVIEW_ERROR_BAD_SETTING) {
DidFinishPrinting(INVALID_SETTINGS);
} else {
DidFinishPrinting(FAIL_PREVIEW);
}
return;
}
// Set the options from document if we are previewing a pdf and send a
// message to browser.
if (print_pages_params_->params.is_first_request &&
!print_preview_context_.IsModifiable()) {
PrintHostMsg_SetOptionsFromDocument_Params options;
if (SetOptionsFromPdfDocument(&options))
Send(new PrintHostMsg_SetOptionsFromDocument(routing_id(), options));
}
is_print_ready_metafile_sent_ = false;
// PDF printer device supports alpha blending.
print_pages_params_->params.supports_alpha_blend = true;
bool generate_draft_pages = false;
if (!settings.GetBoolean(kSettingGenerateDraftData, &generate_draft_pages)) {
NOTREACHED();
}
print_preview_context_.set_generate_draft_pages(generate_draft_pages);
PrepareFrameForPreviewDocument();
}
void PrintRenderFrameHelper::PrepareFrameForPreviewDocument() {
reset_prep_frame_view_ = false;
if (!print_pages_params_ || CheckForCancel()) {
DidFinishPrinting(FAIL_PREVIEW);
return;
}
// Don't reset loading frame or WebKit will fail assert. Just retry when
// current selection is loaded.
if (prep_frame_view_ && prep_frame_view_->IsLoadingSelection()) {
reset_prep_frame_view_ = true;
return;
}
const PrintMsg_Print_Params& print_params = print_pages_params_->params;
prep_frame_view_ = std::make_unique<PrepareFrameAndViewForPrint>(
print_params, print_preview_context_.source_frame(),
print_preview_context_.source_node(), ignore_css_margins_);
prep_frame_view_->CopySelectionIfNeeded(
render_frame()->GetWebkitPreferences(),
base::Bind(&PrintRenderFrameHelper::OnFramePreparedForPreviewDocument,
weak_ptr_factory_.GetWeakPtr()));
}
void PrintRenderFrameHelper::OnFramePreparedForPreviewDocument() {
if (reset_prep_frame_view_) {
PrepareFrameForPreviewDocument();
return;
}
DidFinishPrinting(CreatePreviewDocument() ? OK : FAIL_PREVIEW);
}
bool PrintRenderFrameHelper::CreatePreviewDocument() {
if (!print_pages_params_ || CheckForCancel())
return false;
UMA_HISTOGRAM_ENUMERATION("PrintPreview.PreviewEvent",
PREVIEW_EVENT_CREATE_DOCUMENT, PREVIEW_EVENT_MAX);
const PrintMsg_Print_Params& print_params = print_pages_params_->params;
const std::vector<int>& pages = print_pages_params_->pages;
if (!print_preview_context_.CreatePreviewDocument(
std::move(prep_frame_view_), pages, print_params.printed_doc_type)) {
return false;
}
PageSizeMargins default_page_layout;
double scale_factor =
print_params.scale_factor >= kEpsilon ? print_params.scale_factor : 1.0f;
ComputePageLayoutInPointsForCss(print_preview_context_.prepared_frame(), 0,
print_params, ignore_css_margins_,
&scale_factor, &default_page_layout);
bool has_page_size_style =
PrintingFrameHasPageSizeStyle(print_preview_context_.prepared_frame(),
print_preview_context_.total_page_count());
int dpi = GetDPI(&print_params);
gfx::Rect printable_area_in_points(
ConvertUnit(print_params.printable_area.x(), dpi, kPointsPerInch),
ConvertUnit(print_params.printable_area.y(), dpi, kPointsPerInch),
ConvertUnit(print_params.printable_area.width(), dpi, kPointsPerInch),
ConvertUnit(print_params.printable_area.height(), dpi, kPointsPerInch));
double fit_to_page_scale_factor = 1.0f;
if (!print_preview_context_.IsModifiable()) {
blink::WebLocalFrame* source_frame = print_preview_context_.source_frame();
const blink::WebNode& source_node = print_preview_context_.source_node();
blink::WebPrintPresetOptions preset_options;
if (source_frame->GetPrintPresetOptionsForPlugin(source_node,
&preset_options)) {
if (preset_options.is_page_size_uniform) {
// Figure out if the sizes have the same orientation
bool is_printable_area_landscape = printable_area_in_points.width() >
printable_area_in_points.height();
bool is_preset_landscape = preset_options.uniform_page_size.width >
preset_options.uniform_page_size.height;
bool rotate = is_printable_area_landscape != is_preset_landscape;
// Match orientation for computing scaling
double printable_width = rotate ? printable_area_in_points.height()
: printable_area_in_points.width();
double printable_height = rotate ? printable_area_in_points.width()
: printable_area_in_points.height();
double scale_width =
printable_width /
static_cast<double>(preset_options.uniform_page_size.width);
double scale_height =
printable_height /
static_cast<double>(preset_options.uniform_page_size.height);
fit_to_page_scale_factor = std::min(scale_width, scale_height);
} else {
fit_to_page_scale_factor = 0.0f;
}
}
}
int fit_to_page_scaling = static_cast<int>(100.0f * fit_to_page_scale_factor);
// Margins: Send default page layout to browser process.
Send(new PrintHostMsg_DidGetDefaultPageLayout(
routing_id(), default_page_layout, printable_area_in_points,
has_page_size_style));
PrintHostMsg_DidGetPreviewPageCount_Params params;
params.page_count = print_preview_context_.total_page_count();
params.fit_to_page_scaling = fit_to_page_scaling;
params.preview_request_id = print_params.preview_request_id;
params.clear_preview_data = print_preview_context_.generate_draft_pages() ||
!print_preview_context_.IsModifiable();
Send(new PrintHostMsg_DidGetPreviewPageCount(routing_id(), params));
if (CheckForCancel())
return false;
while (!print_preview_context_.IsFinalPageRendered()) {
int page_number = print_preview_context_.GetNextPageNumber();
DCHECK_GE(page_number, 0);
if (!RenderPreviewPage(page_number, print_params))
return false;
if (CheckForCancel())
return false;
// We must call PrepareFrameAndViewForPrint::FinishPrinting() (by way of
// print_preview_context_.AllPagesRendered()) before calling
// FinalizePrintReadyDocument() when printing a PDF because the plugin
// code does not generate output until we call FinishPrinting(). We do not
// generate draft pages for PDFs, so IsFinalPageRendered() and
// IsLastPageOfPrintReadyMetafile() will be true in the same iteration of
// the loop.
if (print_preview_context_.IsFinalPageRendered())
print_preview_context_.AllPagesRendered();
if (print_preview_context_.IsLastPageOfPrintReadyMetafile()) {
DCHECK(print_preview_context_.IsModifiable() ||
print_preview_context_.IsFinalPageRendered());
if (!FinalizePrintReadyDocument())
return false;
}
}
print_preview_context_.Finished();
return true;
}
#if !defined(OS_MACOSX) && BUILDFLAG(ENABLE_PRINT_PREVIEW)
bool PrintRenderFrameHelper::RenderPreviewPage(
int page_number,
const PrintMsg_Print_Params& print_params) {
std::unique_ptr<PdfMetafileSkia> draft_metafile;
PdfMetafileSkia* initial_render_metafile = print_preview_context_.metafile();
if (print_preview_context_.IsModifiable() && is_print_ready_metafile_sent_) {
draft_metafile =
std::make_unique<PdfMetafileSkia>(print_params.printed_doc_type);
initial_render_metafile = draft_metafile.get();
}
base::TimeTicks begin_time = base::TimeTicks::Now();
PrintPageInternal(print_params, page_number,
print_preview_context_.total_page_count(),
print_preview_context_.prepared_frame(),
initial_render_metafile, nullptr, nullptr);
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 =
print_preview_context_.metafile()->GetMetafileForCurrentPage(
print_params.printed_doc_type);
}
return PreviewPageRendered(page_number, draft_metafile.get());
}
#endif // !defined(OS_MACOSX) && BUILDFLAG(ENABLE_PRINT_PREVIEW)
bool PrintRenderFrameHelper::FinalizePrintReadyDocument() {
DCHECK(!is_print_ready_metafile_sent_);
print_preview_context_.FinalizePrintReadyDocument();
PdfMetafileSkia* metafile = print_preview_context_.metafile();
PrintHostMsg_DidPreviewDocument_Params preview_params;
if (!CopyMetafileDataToReadOnlySharedMem(
*metafile, &preview_params.metafile_data_handle)) {
LOG(ERROR) << "CopyMetafileDataToReadOnlySharedMem failed";
print_preview_context_.set_error(PREVIEW_ERROR_METAFILE_COPY_FAILED);
return false;
}
preview_params.data_size = metafile->GetDataSize();
preview_params.document_cookie = print_pages_params_->params.document_cookie;
preview_params.expected_pages_count =
print_preview_context_.total_page_count();
preview_params.modifiable = print_preview_context_.IsModifiable();
preview_params.preview_request_id =
print_pages_params_->params.preview_request_id;
is_print_ready_metafile_sent_ = true;
Send(new PrintHostMsg_MetafileReadyForPrinting(routing_id(), preview_params));
return true;
}
#endif // BUILDFLAG(ENABLE_PRINT_PREVIEW)
void PrintRenderFrameHelper::OnPrintingDone(bool success) {
if (ipc_nesting_level_ > 1)
return;
notify_browser_of_print_failure_ = false;
if (!success)
LOG(ERROR) << "Failure in OnPrintingDone";
DidFinishPrinting(success ? OK : FAIL_PRINT);
}
void PrintRenderFrameHelper::OnSetPrintingEnabled(bool enabled) {
is_printing_enabled_ = enabled;
}
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
void PrintRenderFrameHelper::OnInitiatePrintPreview(bool has_selection) {
if (ipc_nesting_level_ > 1)
return;
blink::WebLocalFrame* frame = render_frame()->GetWebFrame();
// If we are printing a PDF extension frame, find the plugin node and print
// that instead.
auto plugin = delegate_->GetPdfElement(frame);
if (!plugin.IsNull()) {
PrintNode(plugin);
return;
}
print_preview_context_.InitWithFrame(frame);
RequestPrintPreview(has_selection
? PRINT_PREVIEW_USER_INITIATED_SELECTION
: PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME);
}
void PrintRenderFrameHelper::OnClosePrintPreviewDialog() {
print_preview_context_.source_frame()->DispatchAfterPrintEvent();
}
#endif
bool PrintRenderFrameHelper::IsPrintingEnabled() const {
return is_printing_enabled_;
}
void PrintRenderFrameHelper::PrintNode(const blink::WebNode& node) {
if (node.IsNull() || !node.GetDocument().GetFrame()) {
// This can occur when the context menu refers to an invalid WebNode.
// See http://crbug.com/100890#c17 for a repro case.
return;
}
if (print_node_in_progress_) {
// This can happen as a result of processing sync messages when printing
// from ppapi plugins. It's a rare case, so its OK to just fail here.
// See http://crbug.com/159165.
return;
}
print_node_in_progress_ = true;
if (g_is_preview_enabled) {
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
print_preview_context_.InitWithNode(node);
RequestPrintPreview(PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE);
#endif
} else {
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
// Make a copy of the node, in case RenderView::OnContextMenuClosed() resets
// its |context_menu_node_|.
blink::WebNode duplicate_node(node);
auto self = weak_ptr_factory_.GetWeakPtr();
Print(duplicate_node.GetDocument().GetFrame(), duplicate_node,
false /* is_scripted? */);
// Check if |this| is still valid.
if (!self)
return;
#endif
}
print_node_in_progress_ = false;
}
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
void PrintRenderFrameHelper::Print(blink::WebLocalFrame* frame,
const blink::WebNode& node,
bool is_scripted) {
// If still not finished with earlier print request simply ignore.
if (prep_frame_view_)
return;
FrameReference frame_ref(frame);
int expected_page_count = 0;
if (!CalculateNumberOfPages(frame, node, &expected_page_count)) {
DidFinishPrinting(FAIL_PRINT_INIT);
return; // Failed to init print page settings.
}
// Some full screen plugins can say they don't want to print.
if (!expected_page_count) {
DidFinishPrinting(FAIL_PRINT);
return;
}
// Ask the browser to show UI to retrieve the final print settings.
{
// PrintHostMsg_ScriptedPrint in GetPrintSettingsFromUser() will reset
// |print_scaling_option|, so save the value here and restore it afterwards.
blink::WebPrintScalingOption scaling_option =
print_pages_params_->params.print_scaling_option;
PrintMsg_PrintPages_Params print_settings;
auto self = weak_ptr_factory_.GetWeakPtr();
GetPrintSettingsFromUser(frame_ref.GetFrame(), node, expected_page_count,
is_scripted, &print_settings);
// Check if |this| is still valid.
if (!self)
return;
print_settings.params.print_scaling_option = scaling_option;
SetPrintPagesParams(print_settings);
if (!print_settings.params.dpi || !print_settings.params.document_cookie) {
DidFinishPrinting(OK); // Release resources and fail silently on failure.
return;
}
}
// Render Pages for printing.
if (!RenderPagesForPrint(frame_ref.GetFrame(), node)) {
LOG(ERROR) << "RenderPagesForPrint failed";
DidFinishPrinting(FAIL_PRINT);
}
scripting_throttler_.Reset();
}
#endif // BUILDFLAG(ENABLE_BASIC_PRINTING)
void PrintRenderFrameHelper::DidFinishPrinting(PrintingResult result) {
int cookie =
print_pages_params_ ? print_pages_params_->params.document_cookie : 0;
switch (result) {
case OK:
break;
case FAIL_PRINT_INIT:
DCHECK(!notify_browser_of_print_failure_);
break;
case FAIL_PRINT:
if (notify_browser_of_print_failure_ && print_pages_params_) {
Send(new PrintHostMsg_PrintingFailed(routing_id(), cookie));
}
break;
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
case FAIL_PREVIEW:
if (!is_print_ready_metafile_sent_) {
if (notify_browser_of_print_failure_) {
LOG(ERROR) << "CreatePreviewDocument failed";
Send(new PrintHostMsg_PrintPreviewFailed(routing_id(), cookie));
} else {
Send(new PrintHostMsg_PrintPreviewCancelled(routing_id(), cookie));
}
}
print_preview_context_.Failed(notify_browser_of_print_failure_);
break;
case INVALID_SETTINGS:
Send(new PrintHostMsg_PrintPreviewInvalidPrinterSettings(routing_id(),
cookie));
print_preview_context_.Failed(false);
break;
#endif // BUILDFLAG(ENABLE_PRINT_PREVIEW)
}
prep_frame_view_.reset();
print_pages_params_.reset();
notify_browser_of_print_failure_ = true;
}
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
void PrintRenderFrameHelper::OnFramePreparedForPrintPages() {
PrintPages();
FinishFramePrinting();
}
void PrintRenderFrameHelper::PrintPages() {
if (!prep_frame_view_) // Printing is already canceled or failed.
return;
prep_frame_view_->StartPrinting();
int page_count = prep_frame_view_->GetExpectedPageCount();
if (!page_count) {
LOG(ERROR) << "Can't print 0 pages.";
return DidFinishPrinting(FAIL_PRINT);
}
const PrintMsg_PrintPages_Params& params = *print_pages_params_;
const PrintMsg_Print_Params& print_params = params.params;
#if !defined(OS_ANDROID)
// TODO(vitalybuka): should be page_count or valid pages from params.pages.
// See http://crbug.com/161576
Send(new PrintHostMsg_DidGetPrintedPagesCount(
routing_id(), print_params.document_cookie, page_count));
#endif // !defined(OS_ANDROID)
if (print_params.preview_ui_id < 0) {
// Printing for system dialog.
int printed_count = params.pages.empty() ? page_count : params.pages.size();
UMA_HISTOGRAM_COUNTS("PrintPreview.PageCount.SystemDialog", printed_count);
}
if (!PrintPagesNative(prep_frame_view_->frame(), page_count)) {
LOG(ERROR) << "Printing failed.";
return DidFinishPrinting(FAIL_PRINT);
}
}
#if defined(OS_MACOSX) || defined(OS_WIN)
bool PrintRenderFrameHelper::PrintPagesNative(blink::WebLocalFrame* frame,
int page_count) {
const PrintMsg_PrintPages_Params& params = *print_pages_params_;
const PrintMsg_Print_Params& print_params = params.params;
std::vector<int> printed_pages = GetPrintedPages(params, page_count);
if (printed_pages.empty())
return false;
PdfMetafileSkia metafile(print_params.printed_doc_type);
CHECK(metafile.Init());
PrintHostMsg_DidPrintDocument_Params page_params;
PrintPageInternal(print_params, printed_pages[0], page_count, frame,
&metafile, &page_params.page_size,
&page_params.content_area);
for (size_t i = 1; i < printed_pages.size(); ++i) {
PrintPageInternal(print_params, printed_pages[i], page_count, frame,
&metafile, nullptr, nullptr);
}
// blink::printEnd() for PDF should be called before metafile is closed.
FinishFramePrinting();
metafile.FinishDocument();
if (!CopyMetafileDataToReadOnlySharedMem(metafile,
&page_params.metafile_data_handle)) {
return false;
}
page_params.data_size = metafile.GetDataSize();
page_params.document_cookie = print_params.document_cookie;
#if defined(OS_WIN)
page_params.physical_offsets = printer_printable_area_.origin();
#endif
Send(new PrintHostMsg_DidPrintDocument(routing_id(), page_params));
return true;
}
#endif // defined(OS_MACOSX) || defined(OS_WIN)
void PrintRenderFrameHelper::FinishFramePrinting() {
prep_frame_view_.reset();
}
#endif // BUILDFLAG(ENABLE_BASIC_PRINTING)
// static - Not anonymous so that platform implementations can use it.
void PrintRenderFrameHelper::ComputePageLayoutInPointsForCss(
blink::WebLocalFrame* frame,
int page_index,
const PrintMsg_Print_Params& page_params,
bool ignore_css_margins,
double* scale_factor,
PageSizeMargins* page_layout_in_points) {
double input_scale_factor = *scale_factor;
PrintMsg_Print_Params params = CalculatePrintParamsForCss(
frame, page_index, page_params, ignore_css_margins,
IsWebPrintScalingOptionFitToPage(page_params), scale_factor);
CalculatePageLayoutFromPrintParams(params, input_scale_factor,
page_layout_in_points);
}
// static - Not anonymous so that platform implementations can use it.
std::vector<int> PrintRenderFrameHelper::GetPrintedPages(
const PrintMsg_PrintPages_Params& params,
int page_count) {
std::vector<int> printed_pages;
if (params.pages.empty()) {
for (int i = 0; i < page_count; ++i) {
printed_pages.push_back(i);
}
} else {
for (int page : params.pages) {
if (page >= 0 && page < page_count) {
printed_pages.push_back(page);
}
}
}
return printed_pages;
}
bool PrintRenderFrameHelper::InitPrintSettings(bool fit_to_paper_size) {
PrintMsg_PrintPages_Params settings;
Send(new PrintHostMsg_GetDefaultPrintSettings(routing_id(),
&settings.params));
// Check if the printer returned any settings, if the settings is empty, we
// can safely assume there are no printer drivers configured. So we safely
// terminate.
bool result = true;
if (!PrintMsg_Print_Params_IsValid(settings.params))
result = false;
// Reset to default values.
ignore_css_margins_ = false;
settings.pages.clear();
settings.params.print_scaling_option =
fit_to_paper_size ? blink::kWebPrintScalingOptionFitToPrintableArea
: blink::kWebPrintScalingOptionSourceSize;
SetPrintPagesParams(settings);
return result;
}
bool PrintRenderFrameHelper::CalculateNumberOfPages(blink::WebLocalFrame* frame,
const blink::WebNode& node,
int* number_of_pages) {
DCHECK(frame);
bool fit_to_paper_size = !(PrintingNodeOrPdfFrame(frame, node));
if (!InitPrintSettings(fit_to_paper_size)) {
notify_browser_of_print_failure_ = false;
Send(new PrintHostMsg_ShowInvalidPrinterSettingsError(routing_id()));
return false;
}
const PrintMsg_Print_Params& params = print_pages_params_->params;
PrepareFrameAndViewForPrint prepare(params, frame, node, ignore_css_margins_);
prepare.StartPrinting();
*number_of_pages = prepare.GetExpectedPageCount();
return true;
}
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
bool PrintRenderFrameHelper::SetOptionsFromPdfDocument(
PrintHostMsg_SetOptionsFromDocument_Params* options) {
blink::WebLocalFrame* source_frame = print_preview_context_.source_frame();
const blink::WebNode& source_node = print_preview_context_.source_node();
blink::WebPrintPresetOptions preset_options;
if (!source_frame->GetPrintPresetOptionsForPlugin(source_node,
&preset_options)) {
return false;
}
options->is_scaling_disabled = PDFShouldDisableScalingBasedOnPreset(
preset_options, print_pages_params_->params, false);
options->copies = preset_options.copies;
// TODO(thestig) This should be a straight pass-through, but print preview
// does not currently support short-edge printing.
switch (preset_options.duplex_mode) {
case blink::kWebSimplex:
options->duplex = SIMPLEX;
break;
case blink::kWebLongEdge:
options->duplex = LONG_EDGE;
break;
default:
options->duplex = UNKNOWN_DUPLEX_MODE;
break;
}
return true;
}
bool PrintRenderFrameHelper::UpdatePrintSettings(
blink::WebLocalFrame* frame,
const blink::WebNode& node,
const base::DictionaryValue& passed_job_settings) {
const base::DictionaryValue* job_settings = &passed_job_settings;
base::DictionaryValue modified_job_settings;
if (job_settings->empty()) {
print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
return false;
}
bool source_is_html = !PrintingNodeOrPdfFrame(frame, node);
if (!source_is_html) {
modified_job_settings.MergeDictionary(job_settings);
modified_job_settings.SetBoolean(kSettingHeaderFooterEnabled, false);
modified_job_settings.SetInteger(kSettingMarginsType, NO_MARGINS);
job_settings = &modified_job_settings;
}
// Send the cookie so that UpdatePrintSettings can reuse PrinterQuery when
// possible.
int cookie =
print_pages_params_ ? print_pages_params_->params.document_cookie : 0;
PrintMsg_PrintPages_Params settings;
bool canceled = false;
Send(new PrintHostMsg_UpdatePrintSettings(routing_id(), cookie, *job_settings,
&settings, &canceled));
if (canceled) {
notify_browser_of_print_failure_ = false;
return false;
}
if (!job_settings->GetInteger(kPreviewUIID, &settings.params.preview_ui_id)) {
NOTREACHED();
print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
return false;
}
// Validate expected print preview settings.
if (!job_settings->GetInteger(kPreviewRequestID,
&settings.params.preview_request_id) ||
!job_settings->GetBoolean(kIsFirstRequest,
&settings.params.is_first_request)) {
NOTREACHED();
print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
return false;
}
settings.params.print_to_pdf = IsPrintToPdfRequested(*job_settings);
UpdateFrameMarginsCssInfo(*job_settings);
settings.params.print_scaling_option = GetPrintScalingOption(
frame, node, source_is_html, *job_settings, settings.params);
SetPrintPagesParams(settings);
if (PrintMsg_Print_Params_IsValid(settings.params))
return true;
print_preview_context_.set_error(PREVIEW_ERROR_INVALID_PRINTER_SETTINGS);
return false;
}
#endif // BUILDFLAG(ENABLE_PRINT_PREVIEW)
#if BUILDFLAG(ENABLE_BASIC_PRINTING)
void PrintRenderFrameHelper::GetPrintSettingsFromUser(
blink::WebLocalFrame* frame,
const blink::WebNode& node,
int expected_pages_count,
bool is_scripted,
PrintMsg_PrintPages_Params* print_settings) {
PrintHostMsg_ScriptedPrint_Params params;
params.cookie = print_pages_params_->params.document_cookie;
params.has_selection = frame->HasSelection();
params.expected_pages_count = expected_pages_count;
MarginType margin_type = DEFAULT_MARGINS;
if (PrintingNodeOrPdfFrame(frame, node))
margin_type = GetMarginsForPdf(frame, node, print_pages_params_->params);
params.margin_type = margin_type;
params.is_scripted = is_scripted;
params.is_modifiable = !PrintingNodeOrPdfFrame(frame, node);
Send(new PrintHostMsg_DidShowPrintDialog(routing_id()));
print_pages_params_.reset();
auto msg = std::make_unique<PrintHostMsg_ScriptedPrint>(routing_id(), params,
print_settings);
msg->EnableMessagePumping();
Send(msg.release());
// WARNING: |this| may be gone at this point. Do not do any more work here
// and just return.
}
bool PrintRenderFrameHelper::RenderPagesForPrint(blink::WebLocalFrame* frame,
const blink::WebNode& node) {
if (!frame || prep_frame_view_)
return false;
const PrintMsg_PrintPages_Params& params = *print_pages_params_;
const PrintMsg_Print_Params& print_params = params.params;
prep_frame_view_ = std::make_unique<PrepareFrameAndViewForPrint>(
print_params, frame, node, ignore_css_margins_);
DCHECK(!print_pages_params_->params.selection_only ||
print_pages_params_->pages.empty());
prep_frame_view_->CopySelectionIfNeeded(
render_frame()->GetWebkitPreferences(),
base::Bind(&PrintRenderFrameHelper::OnFramePreparedForPrintPages,
weak_ptr_factory_.GetWeakPtr()));
return true;
}
#endif // BUILDFLAG(ENABLE_BASIC_PRINTING)
#if !defined(OS_MACOSX)
void PrintRenderFrameHelper::PrintPageInternal(
const PrintMsg_Print_Params& params,
int page_number,
int page_count,
blink::WebLocalFrame* frame,
PdfMetafileSkia* metafile,
gfx::Size* page_size_in_dpi,
gfx::Rect* content_area_in_dpi) {
double css_scale_factor =
params.scale_factor >= kEpsilon ? params.scale_factor : 1.0f;
// Save the original page size here to avoid rounding errors incurred by
// converting to pixels and back and by scaling the page for reflow and
// scaling back. Windows uses |page_size_in_dpi| for the actual page size
// so requires an accurate value.
gfx::Size original_page_size = params.page_size;
PageSizeMargins page_layout_in_points;
ComputePageLayoutInPointsForCss(frame, page_number, params,
ignore_css_margins_, &css_scale_factor,
&page_layout_in_points);
gfx::Size page_size;
gfx::Rect content_area;
GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, &page_size,
&content_area);
// Calculate the actual page size and content area in dpi.
if (page_size_in_dpi)
*page_size_in_dpi = original_page_size;
if (content_area_in_dpi) {
// Output PDF matches paper size and should be printer edge to edge.
*content_area_in_dpi =
gfx::Rect(0, 0, page_size_in_dpi->width(), page_size_in_dpi->height());
}
gfx::Rect canvas_area =
params.display_header_footer ? gfx::Rect(page_size) : content_area;
// TODO(thestig): Figure out why Linux is different.
#if defined(OS_WIN)
float webkit_page_shrink_factor = frame->GetPrintPageShrink(page_number);
float scale_factor = css_scale_factor * webkit_page_shrink_factor;
#else
float scale_factor = css_scale_factor;
#endif
cc::PaintCanvas* canvas =
metafile->GetVectorCanvasForNewPage(page_size, canvas_area, scale_factor);
if (!canvas)
return;
MetafileSkiaWrapper::SetMetafileOnCanvas(canvas, metafile);
if (params.display_header_footer) {
#if defined(OS_WIN)
const float fudge_factor = 1;
#else
// TODO(thestig): Figure out why Linux needs this. It is almost certainly
// |kPrintingMinimumShrinkFactor| from Blink.
const float fudge_factor = kPrintingMinimumShrinkFactor;
#endif
// |page_number| is 0-based, so 1 is added.
PrintHeaderAndFooter(canvas, page_number + 1, page_count, *frame,
scale_factor / fudge_factor, page_layout_in_points,
params);
}
float webkit_scale_factor = RenderPageContent(
frame, page_number, canvas_area, content_area, scale_factor, canvas);
DCHECK_GT(webkit_scale_factor, 0.0f);
// Done printing. Close the canvas to retrieve the compiled metafile.
bool ret = metafile->FinishPage();
DCHECK(ret);
}
#endif // !defined(OS_MACOSX)
bool PrintRenderFrameHelper::CopyMetafileDataToReadOnlySharedMem(
const PdfMetafileSkia& metafile,
base::SharedMemoryHandle* shared_mem_handle) {
uint32_t buf_size = metafile.GetDataSize();
if (buf_size == 0)
return false;
mojo::ScopedSharedBufferHandle buffer =
mojo::SharedBufferHandle::Create(buf_size);
if (!buffer.is_valid())
return false;
mojo::ScopedSharedBufferMapping mapping = buffer->Map(buf_size);
if (!mapping)
return false;
if (!metafile.GetData(mapping.get(), buf_size))
return false;
MojoResult result = mojo::UnwrapSharedMemoryHandle(
buffer->Clone(mojo::SharedBufferHandle::AccessMode::READ_ONLY),
shared_mem_handle, nullptr, nullptr);
DCHECK_EQ(MOJO_RESULT_OK, result);
return true;
}
#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
void PrintRenderFrameHelper::ShowScriptedPrintPreview() {
if (is_scripted_preview_delayed_) {
is_scripted_preview_delayed_ = false;
Send(new PrintHostMsg_ShowScriptedPrintPreview(
routing_id(), print_preview_context_.IsModifiable()));
}
}
void PrintRenderFrameHelper::RequestPrintPreview(PrintPreviewRequestType type) {
auto weak_this = weak_ptr_factory_.GetWeakPtr();
print_preview_context_.source_frame()->DispatchBeforePrintEvent();
if (!weak_this)
return;
const bool is_modifiable = print_preview_context_.IsModifiable();
const bool has_selection = print_preview_context_.HasSelection();
PrintHostMsg_RequestPrintPreview_Params params;
params.is_modifiable = is_modifiable;
params.has_selection = has_selection;
switch (type) {
case PRINT_PREVIEW_SCRIPTED: {
// Shows scripted print preview in two stages.
// 1. PrintHostMsg_SetupScriptedPrintPreview blocks this call and JS by
// pumping messages here.
// 2. PrintHostMsg_ShowScriptedPrintPreview shows preview once the
// document has been loaded.
is_scripted_preview_delayed_ = true;
if (is_loading_ && GetPlugin(print_preview_context_.source_frame())) {
// Wait for DidStopLoading. Plugins may not know the correct
// |is_modifiable| value until they are fully loaded, which occurs when
// DidStopLoading() is called. Defer showing the preview until then.
on_stop_loading_closure_ =
base::Bind(&PrintRenderFrameHelper::ShowScriptedPrintPreview,
weak_ptr_factory_.GetWeakPtr());
} else {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::Bind(&PrintRenderFrameHelper::ShowScriptedPrintPreview,
weak_ptr_factory_.GetWeakPtr()));
}
auto msg = std::make_unique<PrintHostMsg_SetupScriptedPrintPreview>(
routing_id());
msg->EnableMessagePumping();
auto self = weak_ptr_factory_.GetWeakPtr();
Send(msg.release());
// Check if |this| is still valid.
if (self)
is_scripted_preview_delayed_ = false;
return;
}
case PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME: {
// Wait for DidStopLoading. Continuing with this function while
// |is_loading_| is true will cause print preview to hang when try to
// print a PDF document.
if (is_loading_ && GetPlugin(print_preview_context_.source_frame())) {
on_stop_loading_closure_ =
base::Bind(&PrintRenderFrameHelper::RequestPrintPreview,
weak_ptr_factory_.GetWeakPtr(), type);
return;
}
break;
}
case PRINT_PREVIEW_USER_INITIATED_SELECTION: {
DCHECK(has_selection);
DCHECK(!GetPlugin(print_preview_context_.source_frame()));
params.selection_only = has_selection;
break;
}
case PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE: {
if (is_loading_ && GetPlugin(print_preview_context_.source_frame())) {
on_stop_loading_closure_ =
base::Bind(&PrintRenderFrameHelper::RequestPrintPreview,
weak_ptr_factory_.GetWeakPtr(), type);
return;
}
params.webnode_only = true;
break;
}
default: {
NOTREACHED();
return;
}
}
Send(new PrintHostMsg_RequestPrintPreview(routing_id(), params));
}
bool PrintRenderFrameHelper::CheckForCancel() {
const PrintMsg_Print_Params& print_params = print_pages_params_->params;
bool cancel = false;
Send(new PrintHostMsg_CheckForCancel(routing_id(), print_params.preview_ui_id,
print_params.preview_request_id,
&cancel));
if (cancel)
notify_browser_of_print_failure_ = false;
return cancel;
}
bool PrintRenderFrameHelper::PreviewPageRendered(int page_number,
PdfMetafileSkia* metafile) {
DCHECK_GE(page_number, FIRST_PAGE_INDEX);
// For non-modifiable files, |metafile| should be NULL, so do not bother
// sending a message. If we don't generate draft metafiles, |metafile| is
// NULL.
if (!print_preview_context_.IsModifiable() ||
!print_preview_context_.generate_draft_pages()) {
DCHECK(!metafile);
return true;
}
if (!metafile) {
NOTREACHED();
print_preview_context_.set_error(
PREVIEW_ERROR_PAGE_RENDERED_WITHOUT_METAFILE);
return false;
}
PrintHostMsg_DidPreviewPage_Params preview_page_params;
if (!CopyMetafileDataToReadOnlySharedMem(
*metafile, &preview_page_params.metafile_data_handle)) {
LOG(ERROR) << "CopyMetafileDataToReadOnlySharedMem failed";
print_preview_context_.set_error(PREVIEW_ERROR_METAFILE_COPY_FAILED);
return false;
}
preview_page_params.data_size = metafile->GetDataSize();
preview_page_params.page_number = page_number;
preview_page_params.preview_request_id =
print_pages_params_->params.preview_request_id;
Send(new PrintHostMsg_DidPreviewPage(routing_id(), preview_page_params));
return true;
}
#endif // BUILDFLAG(ENABLE_PRINT_PREVIEW)
PrintRenderFrameHelper::PrintPreviewContext::PrintPreviewContext()
: total_page_count_(0),
current_page_index_(0),
generate_draft_pages_(true),
is_modifiable_(true),
print_ready_metafile_page_count_(0),
error_(PREVIEW_ERROR_NONE),
state_(UNINITIALIZED) {}
PrintRenderFrameHelper::PrintPreviewContext::~PrintPreviewContext() {}
void PrintRenderFrameHelper::PrintPreviewContext::InitWithFrame(
blink::WebLocalFrame* web_frame) {
DCHECK(web_frame);
DCHECK(!IsRendering());
state_ = INITIALIZED;
source_frame_.Reset(web_frame);
source_node_.Reset();
CalculateIsModifiable();
}
void PrintRenderFrameHelper::PrintPreviewContext::InitWithNode(
const blink::WebNode& web_node) {
DCHECK(!web_node.IsNull());
DCHECK(web_node.GetDocument().GetFrame());
DCHECK(!IsRendering());
state_ = INITIALIZED;
source_frame_.Reset(web_node.GetDocument().GetFrame());
source_node_ = web_node;
CalculateIsModifiable();
}
void PrintRenderFrameHelper::PrintPreviewContext::OnPrintPreview() {
DCHECK_EQ(INITIALIZED, state_);
ClearContext();
}
bool PrintRenderFrameHelper::PrintPreviewContext::CreatePreviewDocument(
std::unique_ptr<PrepareFrameAndViewForPrint> prepared_frame,
const std::vector<int>& pages,
SkiaDocumentType doc_type) {
DCHECK_EQ(INITIALIZED, state_);
state_ = RENDERING;
// Need to make sure old object gets destroyed first.
prep_frame_view_ = std::move(prepared_frame);
prep_frame_view_->StartPrinting();
total_page_count_ = prep_frame_view_->GetExpectedPageCount();
if (total_page_count_ == 0) {
LOG(ERROR) << "CreatePreviewDocument got 0 page count";
set_error(PREVIEW_ERROR_ZERO_PAGES);
return false;
}
metafile_ = std::make_unique<PdfMetafileSkia>(doc_type);
CHECK(metafile_->Init());
current_page_index_ = 0;
pages_to_render_ = pages;
// Sort and make unique.
std::sort(pages_to_render_.begin(), pages_to_render_.end());
pages_to_render_.resize(
std::unique(pages_to_render_.begin(), pages_to_render_.end()) -
pages_to_render_.begin());
// Remove invalid pages.
pages_to_render_.resize(std::lower_bound(pages_to_render_.begin(),
pages_to_render_.end(),
total_page_count_) -
pages_to_render_.begin());
print_ready_metafile_page_count_ = pages_to_render_.size();
if (pages_to_render_.empty()) {
print_ready_metafile_page_count_ = total_page_count_;
// Render all pages.
for (int i = 0; i < total_page_count_; ++i)
pages_to_render_.push_back(i);
} else if (generate_draft_pages_) {
int pages_index = 0;
for (int i = 0; i < total_page_count_; ++i) {
if (pages_index < print_ready_metafile_page_count_ &&
i == pages_to_render_[pages_index]) {
pages_index++;
continue;
}
pages_to_render_.push_back(i);
}
}
document_render_time_ = base::TimeDelta();
begin_time_ = base::TimeTicks::Now();
return true;
}
void PrintRenderFrameHelper::PrintPreviewContext::RenderedPreviewPage(
const base::TimeDelta& page_time) {
DCHECK_EQ(RENDERING, state_);
document_render_time_ += page_time;
UMA_HISTOGRAM_TIMES("PrintPreview.RenderPDFPageTime", page_time);
}
void PrintRenderFrameHelper::PrintPreviewContext::AllPagesRendered() {
DCHECK_EQ(RENDERING, state_);
state_ = DONE;
prep_frame_view_->FinishPrinting();
}
void PrintRenderFrameHelper::PrintPreviewContext::FinalizePrintReadyDocument() {
DCHECK(IsRendering());
base::TimeTicks begin_time = base::TimeTicks::Now();
metafile_->FinishDocument();
if (print_ready_metafile_page_count_ <= 0) {
NOTREACHED();
return;
}
UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderToPDFTime",
document_render_time_);
base::TimeDelta total_time =
(base::TimeTicks::Now() - begin_time) + document_render_time_;
UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTime",
total_time);
UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTimeAvgPerPage",
total_time / pages_to_render_.size());
}
void PrintRenderFrameHelper::PrintPreviewContext::Finished() {
DCHECK_EQ(DONE, state_);
state_ = INITIALIZED;
ClearContext();
}
void PrintRenderFrameHelper::PrintPreviewContext::Failed(bool report_error) {
DCHECK(state_ == INITIALIZED || state_ == RENDERING);
state_ = INITIALIZED;
if (report_error) {
DCHECK_NE(PREVIEW_ERROR_NONE, error_);
UMA_HISTOGRAM_ENUMERATION("PrintPreview.RendererError", error_,
PREVIEW_ERROR_LAST_ENUM);
}
ClearContext();
}
int PrintRenderFrameHelper::PrintPreviewContext::GetNextPageNumber() {
DCHECK_EQ(RENDERING, state_);
if (IsFinalPageRendered())
return -1;
return pages_to_render_[current_page_index_++];
}
bool PrintRenderFrameHelper::PrintPreviewContext::IsRendering() const {
return state_ == RENDERING || state_ == DONE;
}
bool PrintRenderFrameHelper::PrintPreviewContext::IsModifiable() const {
DCHECK(state_ != UNINITIALIZED);
return is_modifiable_;
}
bool PrintRenderFrameHelper::PrintPreviewContext::HasSelection() {
return IsModifiable() && source_frame()->HasSelection();
}
bool PrintRenderFrameHelper::PrintPreviewContext::
IsLastPageOfPrintReadyMetafile() const {
DCHECK(IsRendering());
return current_page_index_ == print_ready_metafile_page_count_;
}
bool PrintRenderFrameHelper::PrintPreviewContext::IsFinalPageRendered() const {
DCHECK(IsRendering());
return static_cast<size_t>(current_page_index_) == pages_to_render_.size();
}
void PrintRenderFrameHelper::PrintPreviewContext::set_generate_draft_pages(
bool generate_draft_pages) {
DCHECK_EQ(INITIALIZED, state_);
generate_draft_pages_ = generate_draft_pages;
}
void PrintRenderFrameHelper::PrintPreviewContext::set_error(
enum PrintPreviewErrorBuckets error) {
error_ = error;
}
blink::WebLocalFrame*
PrintRenderFrameHelper::PrintPreviewContext::source_frame() {
DCHECK(state_ != UNINITIALIZED);
return source_frame_.GetFrame();
}
const blink::WebNode& PrintRenderFrameHelper::PrintPreviewContext::source_node()
const {
DCHECK(state_ != UNINITIALIZED);
return source_node_;
}
blink::WebLocalFrame*
PrintRenderFrameHelper::PrintPreviewContext::prepared_frame() {
DCHECK(state_ != UNINITIALIZED);
return prep_frame_view_->frame();
}
const blink::WebNode&
PrintRenderFrameHelper::PrintPreviewContext::prepared_node() const {
DCHECK(state_ != UNINITIALIZED);
return prep_frame_view_->node();
}
int PrintRenderFrameHelper::PrintPreviewContext::total_page_count() const {
DCHECK(state_ != UNINITIALIZED);
return total_page_count_;
}
bool PrintRenderFrameHelper::PrintPreviewContext::generate_draft_pages() const {
return generate_draft_pages_;
}
PdfMetafileSkia* PrintRenderFrameHelper::PrintPreviewContext::metafile() {
DCHECK(IsRendering());
return metafile_.get();
}
int PrintRenderFrameHelper::PrintPreviewContext::last_error() const {
return error_;
}
void PrintRenderFrameHelper::PrintPreviewContext::ClearContext() {
prep_frame_view_.reset();
metafile_.reset();
pages_to_render_.clear();
error_ = PREVIEW_ERROR_NONE;
}
void PrintRenderFrameHelper::PrintPreviewContext::CalculateIsModifiable() {
// The only kind of node we can print right now is a PDF node.
is_modifiable_ = !PrintingNodeOrPdfFrame(source_frame(), source_node_);
}
void PrintRenderFrameHelper::SetPrintPagesParams(
const PrintMsg_PrintPages_Params& settings) {
print_pages_params_ = std::make_unique<PrintMsg_PrintPages_Params>(settings);
Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
settings.params.document_cookie));
}
PrintRenderFrameHelper::ScriptingThrottler::ScriptingThrottler() : count_(0) {}
bool PrintRenderFrameHelper::ScriptingThrottler::IsAllowed(
blink::WebLocalFrame* frame) {
const int kMinSecondsToIgnoreJavascriptInitiatedPrint = 2;
const int kMaxSecondsToIgnoreJavascriptInitiatedPrint = 32;
bool too_frequent = false;
// Check if there is script repeatedly trying to print and ignore it if too
// frequent. The first 3 times, we use a constant wait time, but if this
// gets excessive, we switch to exponential wait time. So for a page that
// calls print() in a loop the user will need to cancel the print dialog
// after: [2, 2, 2, 4, 8, 16, 32, 32, ...] seconds.
// This gives the user time to navigate from the page.
if (count_ > 0) {
base::TimeDelta diff = base::Time::Now() - last_print_;
int min_wait_seconds = kMinSecondsToIgnoreJavascriptInitiatedPrint;
if (count_ > 3) {
min_wait_seconds =
std::min(kMinSecondsToIgnoreJavascriptInitiatedPrint << (count_ - 3),
kMaxSecondsToIgnoreJavascriptInitiatedPrint);
}
if (diff.InSeconds() < min_wait_seconds) {
too_frequent = true;
}
}
if (!too_frequent) {
++count_;
last_print_ = base::Time::Now();
return true;
}
blink::WebString message(
blink::WebString::FromUTF8("Ignoring too frequent calls to print()."));
frame->AddMessageToConsole(blink::WebConsoleMessage(
blink::WebConsoleMessage::kLevelWarning, message));
return false;
}
void PrintRenderFrameHelper::ScriptingThrottler::Reset() {
// Reset counter on successful print.
count_ = 0;
}
} // namespace printing