out_of_process_instance.h

// 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.

#ifndef PDF_OUT_OF_PROCESS_INSTANCE_H_
#define PDF_OUT_OF_PROCESS_INSTANCE_H_

#include <stdint.h>
#include <string.h>

#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include "base/containers/queue.h"
#include "base/macros.h"
#include "pdf/paint_manager.h"
#include "pdf/pdf_engine.h"
#include "pdf/preview_mode_client.h"
#include "ppapi/c/private/ppp_pdf.h"
#include "ppapi/cpp/dev/printing_dev.h"
#include "ppapi/cpp/image_data.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/private/find_private.h"
#include "ppapi/cpp/private/uma_private.h"
#include "ppapi/cpp/url_loader.h"
#include "ppapi/utility/completion_callback_factory.h"

namespace pp {
class TextInput_Dev;
}

namespace chrome_pdf {

class OutOfProcessInstance : public pp::Instance,
                             public pp::Find_Private,
                             public pp::Printing_Dev,
                             public PaintManager::Client,
                             public PDFEngine::Client,
                             public PreviewModeClient::Client {
 public:
  explicit OutOfProcessInstance(PP_Instance instance);
  ~OutOfProcessInstance() override;

  // pp::Instance implementation.
  bool Init(uint32_t argc, const char* argn[], const char* argv[]) override;
  void HandleMessage(const pp::Var& message) override;
  bool HandleInputEvent(const pp::InputEvent& event) override;
  void DidChangeView(const pp::View& view) override;
  void DidChangeFocus(bool has_focus) override;

  // pp::Find_Private implementation.
  bool StartFind(const std::string& text, bool case_sensitive) override;
  void SelectFindResult(bool forward) override;
  void StopFind() override;

  // pp::PaintManager::Client implementation.
  void OnPaint(const std::vector<pp::Rect>& paint_rects,
               std::vector<PaintManager::ReadyRect>* ready,
               std::vector<pp::Rect>* pending) override;

  // pp::Printing_Dev implementation.
  uint32_t QuerySupportedPrintOutputFormats() override;
  int32_t PrintBegin(const PP_PrintSettings_Dev& print_settings) override;
  pp::Resource PrintPages(const PP_PrintPageNumberRange_Dev* page_ranges,
                          uint32_t page_range_count) override;
  void PrintEnd() override;
  bool IsPrintScalingDisabled() override;

  // pp::Private implementation.
  pp::Var GetLinkAtPosition(const pp::Point& point);
  void GetPrintPresetOptionsFromDocument(PP_PdfPrintPresetOptions_Dev* options);
  void EnableAccessibility();
  void SetCaretPosition(const pp::FloatPoint& position);
  void MoveRangeSelectionExtent(const pp::FloatPoint& extent);
  void SetSelectionBounds(const pp::FloatPoint& base,
                          const pp::FloatPoint& extent);
  bool CanEditText();
  bool HasEditableText();
  void ReplaceSelection(const std::string& text);
  bool CanUndo();
  bool CanRedo();
  void Undo();
  void Redo();
  void HandleAccessibilityAction(
      const PP_PdfAccessibilityActionData& action_data);
  int32_t PdfPrintBegin(const PP_PrintSettings_Dev* print_settings,
                        const PP_PdfPrintSettings_Dev* pdf_print_settings);

  void FlushCallback(int32_t result);
  void DidOpen(int32_t result);
  void DidOpenPreview(int32_t result);

  // Called to print without re-entrancy issues.
  void OnPrint(int32_t);

  // PDFEngine::Client implementation.
  void ProposeDocumentLayout(const DocumentLayout& layout) override;
  void Invalidate(const pp::Rect& rect) override;
  void DidScroll(const pp::Point& point) override;
  void ScrollToX(int x_in_screen_coords) override;
  void ScrollToY(int y_in_screen_coords, bool compensate_for_toolbar) override;
  void ScrollBy(const pp::Point& point) override;
  void ScrollToPage(int page) override;
  void NavigateTo(const std::string& url,
                  WindowOpenDisposition disposition) override;
  void NavigateToDestination(int page,
                             const float* x,
                             const float* y,
                             const float* zoom) override;
  void UpdateCursor(PP_CursorType_Dev cursor) override;
  void UpdateTickMarks(const std::vector<pp::Rect>& tickmarks) override;
  void NotifyNumberOfFindResultsChanged(int total, bool final_result) override;
  void NotifySelectedFindResultChanged(int current_find_index) override;
  void GetDocumentPassword(
      pp::CompletionCallbackWithOutput<pp::Var> callback) override;
  void Beep() override;
  void Alert(const std::string& message) override;
  bool Confirm(const std::string& message) override;
  std::string Prompt(const std::string& question,
                     const std::string& default_answer) override;
  std::string GetURL() override;
  void Email(const std::string& to,
             const std::string& cc,
             const std::string& bcc,
             const std::string& subject,
             const std::string& body) override;
  void Print() override;
  void SubmitForm(const std::string& url,
                  const void* data,
                  int length) override;
  pp::URLLoader CreateURLLoader() override;
  std::vector<SearchStringResult> SearchString(const base::char16* string,
                                               const base::char16* term,
                                               bool case_sensitive) override;
  void DocumentLoadComplete(
      const PDFEngine::DocumentFeatures& document_features) override;
  void DocumentLoadFailed() override;
  pp::Instance* GetPluginInstance() override;
  void DocumentHasUnsupportedFeature(const std::string& feature) override;
  void DocumentLoadProgress(uint32_t available, uint32_t doc_size) override;
  void FormTextFieldFocusChange(bool in_focus) override;
  bool IsPrintPreview() override;
  uint32_t GetBackgroundColor() override;
  void IsSelectingChanged(bool is_selecting) override;
  void SelectionChanged(const pp::Rect& left, const pp::Rect& right) override;
  void IsEditModeChanged(bool is_edit_mode) override;
  float GetToolbarHeightInScreenCoords() override;

  // PreviewModeClient::Client implementation.
  void PreviewDocumentLoadComplete() override;
  void PreviewDocumentLoadFailed() override;

  // Helper functions for implementing PPP_PDF.
  void RotateClockwise();
  void RotateCounterclockwise();
  void SetTwoUpView(bool enable_two_up_view);

  // Creates a file name for saving a PDF file, given the source URL. Exposed
  // for testing.
  static std::string GetFileNameFromUrl(const std::string& url);

 private:
  void ResetRecentlySentFindUpdate(int32_t);

  // Called whenever the plugin geometry changes to update the location of the
  // background parts, and notifies the pdf engine.
  void OnGeometryChanged(double old_zoom, float old_device_scale);

  // Figures out the location of any background rectangles (i.e. those that
  // aren't painted by the PDF engine).
  void CalculateBackgroundParts();

  // Computes document width/height in device pixels, based on current zoom and
  // device scale
  int GetDocumentPixelWidth() const;
  int GetDocumentPixelHeight() const;

  // Draws a rectangle with the specified dimensions and color in our buffer.
  void FillRect(const pp::Rect& rect, uint32_t color);

  void LoadUrl(const std::string& url, bool is_print_preview);

  // Creates a URL loader and allows it to access all urls, i.e. not just the
  // frame's origin.
  pp::URLLoader CreateURLLoaderInternal();

  bool ShouldSaveEdits() const;
  void SaveToFile(const std::string& token);
  void SaveToBuffer(const std::string& token);
  void ConsumeSaveToken(const std::string& token);

  void FormDidOpen(int32_t result);

  void UserMetricsRecordAction(const std::string& action);

  // Start loading accessibility information.
  void LoadAccessibility();

  // Send accessibility information about the given page index.
  void SendNextAccessibilityPage(int32_t page_index);

  // Send the accessibility information about the current viewport. This is
  // done once when accessibility is first loaded and again when the geometry
  // changes.
  void SendAccessibilityViewportInfo();

  enum DocumentLoadState {
    LOAD_STATE_LOADING,
    LOAD_STATE_COMPLETE,
    LOAD_STATE_FAILED,
  };

  // Set new zoom scale.
  void SetZoom(double scale);

  // Reduces the document to 1 page and appends |print_preview_page_count_| - 1
  // blank pages to the document for print preview.
  void AppendBlankPrintPreviewPages();

  // Process the preview page data information. |src_url| specifies the preview
  // page data location. The |src_url| is in the format:
  // chrome://print/id/page_number/print.pdf
  // |dest_page_index| specifies the blank page index that needs to be replaced
  // with the new page data.
  void ProcessPreviewPageInfo(const std::string& src_url, int dest_page_index);
  // Load the next available preview page into the blank page.
  void LoadAvailablePreviewPage();

  // Called after a preview page has loaded or failed to load.
  void LoadNextPreviewPage();

  // Send a notification that the print preview has loaded.
  void SendPrintPreviewLoadedNotification();

  // Send document metadata. (e.g. PDF title and bookmarks.)
  void SendDocumentMetadata();

  // Send the loading progress, where |percentage| represents the progress, or
  // -1 for loading error.
  void SendLoadingProgress(double percentage);

  // Bound the given scroll offset to the document.
  pp::FloatPoint BoundScrollOffsetToDocument(
      const pp::FloatPoint& scroll_offset);

  // Add a sample to an enumerated histogram and filter out print preview usage.
  template <typename T>
  void HistogramEnumeration(const char* name, T sample);

  // Wrappers for |uma_| so histogram reporting only occurs when the PDF Viewer
  // is not being used for print preview.
  void HistogramCustomCountsDeprecated(const std::string& name,
                                       int32_t sample,
                                       int32_t min,
                                       int32_t max,
                                       uint32_t bucket_count);
  void HistogramEnumerationDeprecated(const std::string& name,
                                      int32_t sample,
                                      int32_t boundary_value);

  pp::ImageData image_data_;
  // Used when the plugin is embedded in a page and we have to create the loader
  // ourself.
  pp::URLLoader embed_loader_;
  pp::URLLoader embed_preview_loader_;

  PP_CursorType_Dev cursor_;  // The current cursor.

  // Size, in pixels, of plugin rectangle.
  pp::Size plugin_size_;
  // Size, in DIPs, of plugin rectangle.
  pp::Size plugin_dip_size_;
  // Remaining area, in pixels, to render the pdf in after accounting for
  // horizontal centering.
  pp::Rect available_area_;
  // Size of entire document in pixels (i.e. if each page is 800 pixels high and
  // there are 10 pages, the height will be 8000).
  pp::Size document_size_;
  // The scroll offset in CSS pixels.
  pp::Point scroll_offset_;

  // Enumeration of pinch states.
  // This should match PinchPhase enum in
  // chrome/browser/resources/pdf/viewport.js
  enum PinchPhase {
    PINCH_NONE = 0,
    PINCH_START = 1,
    PINCH_UPDATE_ZOOM_OUT = 2,
    PINCH_UPDATE_ZOOM_IN = 3,
    PINCH_END = 4
  };

  // Current zoom factor.
  double zoom_;
  // True if we request a new bitmap rendering.
  bool needs_reraster_;
  // The scroll position for the last raster, before any transformations are
  // applied.
  pp::FloatPoint scroll_offset_at_last_raster_;
  // True if last bitmap was smaller than screen.
  bool last_bitmap_smaller_;
  // Current device scale factor. Multiply by |device_scale_| to convert from
  // viewport to screen coordinates. Divide by |device_scale_| to convert from
  // screen to viewport coordinates.
  float device_scale_;
  // True if the plugin is full-page.
  bool full_;

  PaintManager paint_manager_;

  struct BackgroundPart {
    pp::Rect location;
    uint32_t color;
  };
  std::vector<BackgroundPart> background_parts_;

  struct PrintSettings {
    PrintSettings() { Clear(); }

    void Clear();

    // This is set to true when PdfPrintBegin() is called and false when
    // PrintEnd() is called.
    bool is_printing;

    // To know whether this was an actual print operation, so we don't double
    // count UMA logging.
    bool print_pages_called;

    // Generic print settings.
    PP_PrintSettings_Dev pepper_print_settings;

    // PDF-specific print settings.
    PP_PdfPrintSettings_Dev pdf_print_settings;
  };

  PrintSettings print_settings_;

  std::unique_ptr<PDFEngine> engine_;

  // The PreviewModeClient used for print preview. Will be passed to
  // |preview_engine_|.
  std::unique_ptr<PreviewModeClient> preview_client_;

  // This engine is used to render the individual preview page data. This is
  // used only in print preview mode. This will use |PreviewModeClient|
  // interface which has very limited access to the pp::Instance.
  std::unique_ptr<PDFEngine> preview_engine_;

  std::string url_;

  // Used for submitting forms.
  pp::URLLoader form_loader_;

  pp::CompletionCallbackFactory<OutOfProcessInstance> callback_factory_;

  // The callback for receiving the password from the page.
  std::unique_ptr<pp::CompletionCallbackWithOutput<pp::Var>> password_callback_;

  // True if we haven't painted the plugin viewport yet.
  bool first_paint_;

  DocumentLoadState document_load_state_;
  DocumentLoadState preview_document_load_state_;

  // A UMA resource for histogram reporting.
  pp::UMAPrivate uma_;

  // Used so that we only tell the browser once about an unsupported feature, to
  // avoid the infobar going up more than once.
  bool told_browser_about_unsupported_feature_;

  // Keeps track of which unsupported features we reported, so we avoid spamming
  // the stats if a feature shows up many times per document.
  std::set<std::string> unsupported_features_reported_;

  // Number of pages in print preview mode for non-PDF source, 0 if print
  // previewing a PDF, and -1 if not in print preview mode.
  int print_preview_page_count_;

  // Number of pages loaded in print preview mode for non-PDF source. Always
  // less than or equal to |print_preview_page_count_|.
  int print_preview_loaded_page_count_;

  // Used to manage loaded print preview page information. A |PreviewPageInfo|
  // consists of data source URL string and the page index in the destination
  // document.
  // The URL string embeds a page number that can be found with
  // ExtractPrintPreviewPageIndex(). This page number is always greater than 0.
  // The page index is always in the range of [0, print_preview_page_count_).
  using PreviewPageInfo = std::pair<std::string, int>;
  base::queue<PreviewPageInfo> preview_pages_info_;

  // Used to signal the browser about focus changes to trigger the OSK.
  // TODO(abodenha@chromium.org) Implement full IME support in the plugin.
  // http://crbug.com/132565
  std::unique_ptr<pp::TextInput_Dev> text_input_;

  // The last document load progress value sent to the web page.
  double last_progress_sent_;

  // Whether an update to the number of find results found was sent less than
  // |kFindResultCooldownMs| milliseconds ago.
  bool recently_sent_find_update_;

  // The tickmarks.
  std::vector<pp::Rect> tickmarks_;

  // Whether the plugin has received a viewport changed message. Nothing should
  // be painted until this is received.
  bool received_viewport_message_;

  // If true, this means we told the RenderView that we're starting a network
  // request so that it can start the throbber. We will tell it again once the
  // document finishes loading.
  bool did_call_start_loading_;

  // If this is true, then don't scroll the plugin in response to DidChangeView
  // messages. This will be true when the extension page is in the process of
  // zooming the plugin so that flickering doesn't occur while zooming.
  bool stop_scrolling_;

  // The background color of the PDF viewer.
  uint32_t background_color_;

  // The blank space above the first page of the document reserved for the
  // toolbar.
  int top_toolbar_height_in_viewport_coords_;

  bool edit_mode_ = false;

  // The current state of accessibility: either off, enabled but waiting
  // for the document to load, or fully loaded.
  enum AccessibilityState {
    ACCESSIBILITY_STATE_OFF,
    ACCESSIBILITY_STATE_PENDING,  // Enabled but waiting for doc to load.
    ACCESSIBILITY_STATE_LOADED
  } accessibility_state_;

  // True if the plugin is loaded in print preview, otherwise false.
  bool is_print_preview_;

  DISALLOW_COPY_AND_ASSIGN(OutOfProcessInstance);
};

}  // namespace chrome_pdf

#endif  // PDF_OUT_OF_PROCESS_INSTANCE_H_