pdf/pdf_engine.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef PDF_PDF_ENGINE_H_
   6 #define PDF_PDF_ENGINE_H_
   7
   8 #include "build/build_config.h"
   9
  10 #if defined(OS_WIN)
  11 #include <windows.h>
  12 #endif
  13
  14 #include <string>
  15 #include <vector>
  16
  17 #include "base/strings/string16.h"
  18
  19 #include "ppapi/c/dev/pp_cursor_type_dev.h"
  20 #include "ppapi/c/dev/ppp_printing_dev.h"
  21 #include "ppapi/c/ppb_input_event.h"
  22 #include "ppapi/cpp/completion_callback.h"
  23 #include "ppapi/cpp/image_data.h"
  24 #include "ppapi/cpp/rect.h"
  25 #include "ppapi/cpp/size.h"
  26 #include "ppapi/cpp/url_loader.h"
  27 #include "ppapi/cpp/var_array.h"
  28
  29 namespace pp {
  30 class InputEvent;
  31 class VarDictionary;
  32 }
  33
  34 const uint32 kBackgroundColor = 0xFFCCCCCC;
  35
  36 namespace chrome_pdf {
  37
  38 class Stream;
  39
  40 #if defined(OS_MACOSX)
  41 const uint32 kDefaultKeyModifier = PP_INPUTEVENT_MODIFIER_METAKEY;
  42 #else  // !OS_MACOSX
  43 const uint32 kDefaultKeyModifier = PP_INPUTEVENT_MODIFIER_CONTROLKEY;
  44 #endif  // OS_MACOSX
  45
  46 // Do one time initialization of the SDK.
  47 bool InitializeSDK();
  48 // Tells the SDK that we're shutting down.
  49 void ShutdownSDK();
  50
  51 // This class encapsulates a PDF rendering engine.
  52 class PDFEngine {
  53  public:
  54
  55   enum DocumentPermission {
  56     PERMISSION_COPY,
  57     PERMISSION_COPY_ACCESSIBLE,
  58     PERMISSION_PRINT_LOW_QUALITY,
  59     PERMISSION_PRINT_HIGH_QUALITY,
  60   };
  61
  62   // The interface that's provided to the rendering engine.
  63   class Client {
  64    public:
  65     // Informs the client about the document's size in pixels.
  66     virtual void DocumentSizeUpdated(const pp::Size& size) = 0;
  67
  68     // Informs the client that the given rect needs to be repainted.
  69     virtual void Invalidate(const pp::Rect& rect) = 0;
  70
  71     // Informs the client to scroll the plugin area by the given offset.
  72     virtual void Scroll(const pp::Point& point) = 0;
  73
  74     // Scroll the horizontal/vertical scrollbars to a given position.
  75     virtual void ScrollToX(int position) = 0;
  76     virtual void ScrollToY(int position) = 0;
  77
  78     // Scroll to the specified page.
  79     virtual void ScrollToPage(int page) = 0;
  80
  81     // Navigate to the given url.
  82     virtual void NavigateTo(const std::string& url, bool open_in_new_tab) = 0;
  83
  84     // Updates the cursor.
  85     virtual void UpdateCursor(PP_CursorType_Dev cursor) = 0;
  86
  87     // Updates the tick marks in the vertical scrollbar.
  88     virtual void UpdateTickMarks(const std::vector<pp::Rect>& tickmarks) = 0;
  89
  90     // Updates the number of find results for the current search term.  If
  91     // there are no matches 0 should be passed in.  Only when the plugin has
  92     // finished searching should it pass in the final count with final_result
  93     // set to true.
  94     virtual void NotifyNumberOfFindResultsChanged(int total,
  95                                                   bool final_result) = 0;
  96
  97     // Updates the index of the currently selected search item.
  98     virtual void NotifySelectedFindResultChanged(int current_find_index) = 0;
  99
 100     // Prompts the user for a password to open this document. The callback is
 101     // called when the password is retrieved.
 102     virtual void GetDocumentPassword(
 103         pp::CompletionCallbackWithOutput<pp::Var> callback) = 0;
 104
 105     // Puts up an alert with the given message.
 106     virtual void Alert(const std::string& message) = 0;
 107
 108     // Puts up a confirm with the given message, and returns true if the user
 109     // presses OK, or false if they press cancel.
 110     virtual bool Confirm(const std::string& message) = 0;
 111
 112     // Puts up a prompt with the given message and default answer and returns
 113     // the answer.
 114     virtual std::string Prompt(const std::string& question,
 115                                const std::string& default_answer) = 0;
 116
 117     // Returns the url of the pdf.
 118     virtual std::string GetURL() = 0;
 119
 120     // Send an email.
 121     virtual void Email(const std::string& to,
 122                        const std::string& cc,
 123                        const std::string& bcc,
 124                        const std::string& subject,
 125                        const std::string& body) = 0;
 126
 127     // Put up the print dialog.
 128     virtual void Print() = 0;
 129
 130     // Submit the data using HTTP POST.
 131     virtual void SubmitForm(const std::string& url,
 132                             const void* data,
 133                             int length) = 0;
 134
 135     // Pops up a file selection dialog and returns the result.
 136     virtual std::string ShowFileSelectionDialog() = 0;
 137
 138     // Creates and returns new URL loader for partial document requests.
 139     virtual pp::URLLoader CreateURLLoader() = 0;
 140
 141     // Calls the client's OnCallback() function in delay_in_ms with the given
 142     // id.
 143     virtual void ScheduleCallback(int id, int delay_in_ms) = 0;
 144
 145     // Searches the given string for "term" and returns the results.  Unicode-
 146     // aware.
 147     struct SearchStringResult {
 148       int start_index;
 149       int length;
 150     };
 151     virtual void SearchString(const base::char16* string,
 152                               const base::char16* term,
 153                               bool case_sensitive,
 154                               std::vector<SearchStringResult>* results) = 0;
 155
 156     // Notifies the client that the engine has painted a page from the document.
 157     virtual void DocumentPaintOccurred() = 0;
 158
 159     // Notifies the client that the document has finished loading.
 160     virtual void DocumentLoadComplete(int page_count) = 0;
 161
 162     // Notifies the client that the document has failed to load.
 163     virtual void DocumentLoadFailed() = 0;
 164
 165     virtual pp::Instance* GetPluginInstance() = 0;
 166
 167     // Notifies that an unsupported feature in the PDF was encountered.
 168     virtual void DocumentHasUnsupportedFeature(const std::string& feature) = 0;
 169
 170     // Notifies the client about document load progress.
 171     virtual void DocumentLoadProgress(uint32 available, uint32 doc_size) = 0;
 172
 173     // Notifies the client about focus changes for form text fields.
 174     virtual void FormTextFieldFocusChange(bool in_focus) = 0;
 175
 176     // Returns true if the plugin has been opened within print preview.
 177     virtual bool IsPrintPreview() = 0;
 178   };
 179
 180   // Factory method to create an instance of the PDF Engine.
 181   static PDFEngine* Create(Client* client);
 182
 183   virtual ~PDFEngine() {}
 184   // Most of these functions are similar to the Pepper functions of the same
 185   // name, so not repeating the description here unless it's different.
 186   virtual bool New(const char* url) = 0;
 187   virtual bool New(const char* url,
 188                    const char* headers) = 0;
 189   virtual void PageOffsetUpdated(const pp::Point& page_offset) = 0;
 190   virtual void PluginSizeUpdated(const pp::Size& size) = 0;
 191   virtual void ScrolledToXPosition(int position) = 0;
 192   virtual void ScrolledToYPosition(int position) = 0;
 193   // Paint is called a series of times. Before these n calls are made, PrePaint
 194   // is called once. After Paint is called n times, PostPaint is called once.
 195   virtual void PrePaint() = 0;
 196   virtual void Paint(const pp::Rect& rect,
 197                      pp::ImageData* image_data,
 198                      std::vector<pp::Rect>* ready,
 199                      std::vector<pp::Rect>* pending) = 0;
 200   virtual void PostPaint() = 0;
 201   virtual bool HandleDocumentLoad(const pp::URLLoader& loader) = 0;
 202   virtual bool HandleEvent(const pp::InputEvent& event) = 0;
 203   virtual uint32_t QuerySupportedPrintOutputFormats() = 0;
 204   virtual void PrintBegin() = 0;
 205   virtual pp::Resource PrintPages(
 206       const PP_PrintPageNumberRange_Dev* page_ranges,
 207       uint32_t page_range_count,
 208       const PP_PrintSettings_Dev& print_settings) = 0;
 209   virtual void PrintEnd() = 0;
 210   virtual void StartFind(const char* text, bool case_sensitive) = 0;
 211   virtual bool SelectFindResult(bool forward) = 0;
 212   virtual void StopFind() = 0;
 213   virtual void ZoomUpdated(double new_zoom_level) = 0;
 214   virtual void RotateClockwise() = 0;
 215   virtual void RotateCounterclockwise() = 0;
 216   virtual std::string GetSelectedText() = 0;
 217   virtual std::string GetLinkAtPosition(const pp::Point& point) = 0;
 218   virtual bool IsSelecting() = 0;
 219   // Checks the permissions associated with this document.
 220   virtual bool HasPermission(DocumentPermission permission) const = 0;
 221   virtual void SelectAll() = 0;
 222   // Gets the number of pages in the document.
 223   virtual int GetNumberOfPages() = 0;
 224   // Gets the 0-based page number of |destination|, or -1 if it does not exist.
 225   virtual int GetNamedDestinationPage(const std::string& destination) = 0;
 226   // Gets the index of the first visible page, or -1 if none are visible.
 227   virtual int GetFirstVisiblePage() = 0;
 228   // Gets the index of the most visible page, or -1 if none are visible.
 229   virtual int GetMostVisiblePage() = 0;
 230   // Gets the rectangle of the page including shadow.
 231   virtual pp::Rect GetPageRect(int index) = 0;
 232   // Gets the rectangle of the page excluding any additional areas.
 233   virtual pp::Rect GetPageContentsRect(int index) = 0;
 234   // Gets the offset of the vertical scrollbar from the top in document
 235   // coordinates.
 236   virtual int GetVerticalScrollbarYPosition() = 0;
 237   // Paints page thumbnail to the ImageData.
 238   virtual void PaintThumbnail(pp::ImageData* image_data, int index) = 0;
 239   // Set color / grayscale rendering modes.
 240   virtual void SetGrayscale(bool grayscale) = 0;
 241   // Callback for timer that's set with ScheduleCallback().
 242   virtual void OnCallback(int id) = 0;
 243   // Gets the JSON representation of the PDF file
 244   virtual std::string GetPageAsJSON(int index) = 0;
 245   // Gets the PDF document's print scaling preference. True if the document can
 246   // be scaled to fit.
 247   virtual bool GetPrintScaling() = 0;
 248   // Returns number of copies to be printed.
 249   virtual int GetCopiesToPrint() = 0;
 250
 251   // Returns a VarArray of Bookmarks, each a VarDictionary containing the
 252   // following key/values:
 253   // - "title" - a string Var.
 254   // - "page" - an int Var.
 255   // - "children" - a VarArray(), with each entry containing a VarDictionary of
 256   //   the same structure.
 257   virtual pp::VarArray GetBookmarks() = 0;
 258
 259   // Append blank pages to make a 1-page document to a |num_pages| document.
 260   // Always retain the first page data.
 261   virtual void AppendBlankPages(int num_pages) = 0;
 262   // Append the first page of the document loaded with the |engine| to this
 263   // document at page |index|.
 264   virtual void AppendPage(PDFEngine* engine, int index) = 0;
 265
 266   // Allow client to query and reset scroll positions in document coordinates.
 267   // Note that this is meant for cases where the device scale factor changes,
 268   // and not for general scrolling - the engine will not repaint due to this.
 269   virtual pp::Point GetScrollPosition() = 0;
 270   virtual void SetScrollPosition(const pp::Point& position) = 0;
 271
 272   virtual bool IsProgressiveLoad() = 0;
 273   virtual pp::VarDictionary GetNamedDestinations() = 0;
 274 };
 275
 276 // Interface for exports that wrap the PDF engine.
 277 class PDFEngineExports {
 278  public:
 279   struct RenderingSettings {
 280    RenderingSettings(int dpi_x,
 281                      int dpi_y,
 282                      const pp::Rect& bounds,
 283                      bool fit_to_bounds,
 284                      bool stretch_to_bounds,
 285                      bool keep_aspect_ratio,
 286                      bool center_in_bounds,
 287                      bool autorotate)
 288       : dpi_x(dpi_x), dpi_y(dpi_y), bounds(bounds),
 289         fit_to_bounds(fit_to_bounds), stretch_to_bounds(stretch_to_bounds),
 290         keep_aspect_ratio(keep_aspect_ratio),
 291         center_in_bounds(center_in_bounds), autorotate(autorotate) {
 292     }
 293     int dpi_x;
 294     int dpi_y;
 295     pp::Rect bounds;
 296     bool fit_to_bounds;
 297     bool stretch_to_bounds;
 298     bool keep_aspect_ratio;
 299     bool center_in_bounds;
 300     bool autorotate;
 301   };
 302
 303   PDFEngineExports() {}
 304   virtual ~PDFEngineExports() {}
 305   static PDFEngineExports* Create();
 306 #if defined(OS_WIN)
 307   // See the definition of RenderPDFPageToDC in pdf.cc for details.
 308   virtual bool RenderPDFPageToDC(const void* pdf_buffer,
 309                                  int buffer_size,
 310                                  int page_number,
 311                                  const RenderingSettings& settings,
 312                                  HDC dc) = 0;
 313 #endif  // OS_WIN
 314   // See the definition of RenderPDFPageToBitmap in pdf.cc for details.
 315   virtual bool RenderPDFPageToBitmap(const void* pdf_buffer,
 316                                      int pdf_buffer_size,
 317                                      int page_number,
 318                                      const RenderingSettings& settings,
 319                                      void* bitmap_buffer) = 0;
 320
 321   virtual bool GetPDFDocInfo(const void* pdf_buffer,
 322                              int buffer_size,
 323                              int* page_count,
 324                              double* max_page_width) = 0;
 325
 326   // See the definition of GetPDFPageSizeByIndex in pdf.cc for details.
 327   virtual bool GetPDFPageSizeByIndex(const void* pdf_buffer,
 328                                      int pdf_buffer_size, int page_number,
 329                                      double* width, double* height) = 0;
 330 };
 331
 332 }  // namespace chrome_pdf
 333
 334 #endif  // PDF_PDF_ENGINE_H_