Add the pdf plugin's source in src\pdf.

pdf/pdfium/pdfium_engine.cc

+// 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 "pdf/pdfium/pdfium_engine.h"
+
+#include <math.h>
+
+#include "base/json/json_writer.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/stl_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_piece.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "pdf/draw_utils.h"
+#include "pdf/pdfium/pdfium_mem_buffer_file_read.h"
+#include "pdf/pdfium/pdfium_mem_buffer_file_write.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/pp_input_event.h"
+#include "ppapi/c/ppb_core.h"
+#include "ppapi/c/private/ppb_pdf.h"
+#include "ppapi/cpp/dev/memory_dev.h"
+#include "ppapi/cpp/input_event.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/private/pdf.h"
+#include "ppapi/cpp/trusted/browser_font_trusted.h"
+#include "ppapi/cpp/url_response_info.h"
+#include "ppapi/cpp/var.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdf_ext.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdf_flatten.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdf_searchex.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdf_sysfontinfo.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdf_transformpage.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdfedit.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdfoom.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdfppo.h"
+#include "third_party/pdfium/fpdfsdk/include/fpdfsave.h"
+#include "third_party/pdfium/fpdfsdk/include/pdfwindow/PDFWindow.h"
+#include "third_party/pdfium/fpdfsdk/include/pdfwindow/PWL_FontMap.h"
+#include "ui/events/keycodes/keyboard_codes.h"
+
+namespace chrome_pdf {
+
+#define kPageShadowTop    3
+#define kPageShadowBottom 7
+#define kPageShadowLeft   5
+#define kPageShadowRight  5
+
+#define kPageSeparatorThickness 4
+#define kHighlightColorR 153
+#define kHighlightColorG 193
+#define kHighlightColorB 218
+
+#define kPendingPageColorR 238
+#define kPendingPageColorG 238
+#define kPendingPageColorB 238
+#define kPendingPageColorA 255
+
+#define kFormHighlightColor 0xFFE4DD
+#define kFormHighlightAlpha 100
+
+#define kMaxPasswordTries 3
+
+// See Table 3.20 in
+// http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
+#define kPDFPermissionPrintLowQualityMask  1 << 2
+#define kPDFPermissionPrintHighQualityMask 1 << 11
+#define kPDFPermissionCopyMask             1 << 4
+#define kPDFPermissionCopyAccessibleMask   1 << 9
+
+#define kLoadingTextVerticalOffset 50
+
+// The maximum amount of time we'll spend doing a paint before we give back
+// control of the thread.
+#define kMaxProgressivePaintTimeMs 50
+
+// The maximum amount of time we'll spend doing the first paint. This is less
+// than the above to keep things smooth if the user is scrolling quickly. We
+// try painting a little because with accelerated compositing, we get flushes
+// only every 16 ms. If we were to wait until the next flush to paint the rest
+// of the pdf, we would never get to draw the pdf and would only draw the
+// scrollbars. This value is picked to give enough time for gpu related code to
+// do its thing and still fit within the timelimit for 60Hz. For the
+// non-composited case, this doesn't make things worse since we're still
+// painting the scrollbars > 60 Hz.
+#define kMaxInitialProgressivePaintTimeMs 10
+
+// Copied from printing/units.cc because we don't want to depend on printing
+// since it brings in libpng which causes duplicate symbols with PDFium.
+const int kPointsPerInch = 72;
+const int kPixelsPerInch = 96;
+
+struct ClipBox {
+  float left;
+  float right;
+  float top;
+  float bottom;
+};
+
+int ConvertUnit(int value, int old_unit, int new_unit) {
+  // With integer arithmetic, to divide a value with correct rounding, you need
+  // to add half of the divisor value to the dividend value. You need to do the
+  // reverse with negative number.
+  if (value >= 0) {
+    return ((value * new_unit) + (old_unit / 2)) / old_unit;
+  } else {
+    return ((value * new_unit) - (old_unit / 2)) / old_unit;
+  }
+}
+
+std::vector<uint32_t> GetPageNumbersFromPrintPageNumberRange(
+    const PP_PrintPageNumberRange_Dev* page_ranges,
+    uint32_t page_range_count) {
+  std::vector<uint32_t> page_numbers;
+  for (uint32_t index = 0; index < page_range_count; ++index) {
+    for (uint32_t page_number = page_ranges[index].first_page_number;
+         page_number <= page_ranges[index].last_page_number; ++page_number) {
+      page_numbers.push_back(page_number);
+    }
+  }
+  return page_numbers;
+}
+
+#if defined(OS_LINUX)
+
+PP_Instance g_last_instance_id;
+
+struct PDFFontSubstitution {
+  const char* pdf_name;
+  const char* face;
+  bool bold;
+  bool italic;
+};
+
+// This list is for CPWL_FontMap::GetDefaultFontByCharset().
+// We pretend to have these font natively and let the browser (or underlying
+// fontconfig) to pick the proper font on the system.
+void EnumFonts(struct _FPDF_SYSFONTINFO* sysfontinfo, void* mapper) {
+  FPDF_AddInstalledFont(mapper, "Arial", FXFONT_DEFAULT_CHARSET);
+
+  int i = 0;
+  while (CPWL_FontMap::defaultTTFMap[i].charset != -1) {
+    FPDF_AddInstalledFont(mapper,
+                          CPWL_FontMap::defaultTTFMap[i].fontname,
+                          CPWL_FontMap::defaultTTFMap[i].charset);
+    ++i;
+  }
+}
+
+const PDFFontSubstitution PDFFontSubstitutions[] = {
+    {"Courier", "Courier New", false, false},
+    {"Courier-Bold", "Courier New", true, false},
+    {"Courier-BoldOblique", "Courier New", true, true},
+    {"Courier-Oblique", "Courier New", false, true},
+    {"Helvetica", "Arial", false, false},
+    {"Helvetica-Bold", "Arial", true, false},
+    {"Helvetica-BoldOblique", "Arial", true, true},
+    {"Helvetica-Oblique", "Arial", false, true},
+    {"Times-Roman", "Times New Roman", false, false},
+    {"Times-Bold", "Times New Roman", true, false},
+    {"Times-BoldItalic", "Times New Roman", true, true},
+    {"Times-Italic", "Times New Roman", false, true},
+
+    // MS P?(Mincho|Gothic) are the most notable fonts in Japanese PDF files
+    // without embedding the glyphs. Sometimes the font names are encoded
+    // in Japanese Windows's locale (CP932/Shift_JIS) without space.
+    // Most Linux systems don't have the exact font, but for outsourcing
+    // fontconfig to find substitutable font in the system, we pass ASCII
+    // font names to it.
+    {"MS-PGothic", "MS PGothic", false, false},
+    {"MS-Gothic", "MS Gothic", false, false},
+    {"MS-PMincho", "MS PMincho", false, false},
+    {"MS-Mincho", "MS Mincho", false, false},
+    // MS PGothic in Shift_JIS encoding.
+    {"\x82\x6C\x82\x72\x82\x6F\x83\x53\x83\x56\x83\x62\x83\x4E",
+     "MS PGothic", false, false},
+    // MS Gothic in Shift_JIS encoding.
+    {"\x82\x6C\x82\x72\x83\x53\x83\x56\x83\x62\x83\x4E",
+     "MS Gothic", false, false},
+    // MS PMincho in Shift_JIS encoding.
+    {"\x82\x6C\x82\x72\x82\x6F\x96\xBE\x92\xA9",
+     "MS PMincho", false, false},
+    // MS Mincho in Shift_JIS encoding.
+    {"\x82\x6C\x82\x72\x96\xBE\x92\xA9",
+     "MS Mincho", false, false},
+};
+
+void* MapFont(struct _FPDF_SYSFONTINFO*, int weight, int italic,
+              int charset, int pitch_family, const char* face, int* exact) {
+  pp::BrowserFontDescription description;
+
+  // Pretend the system does not have the Symbol font to force a fallback to
+  // the built in Symbol font in CFX_FontMapper::FindSubstFont().
+  if (strcmp(face, "Symbol") == 0)
+    return NULL;
+
+  if (pitch_family & FXFONT_FF_FIXEDPITCH) {
+    description.set_family(PP_BROWSERFONT_TRUSTED_FAMILY_MONOSPACE);
+  } else if (pitch_family & FXFONT_FF_ROMAN) {
+    description.set_family(PP_BROWSERFONT_TRUSTED_FAMILY_SERIF);
+  }
+
+  // Map from the standard PDF fonts to TrueType font names.
+  size_t i;
+  for (i = 0; i < arraysize(PDFFontSubstitutions); ++i) {
+    if (strcmp(face, PDFFontSubstitutions[i].pdf_name) == 0) {
+      description.set_face(PDFFontSubstitutions[i].face);
+      if (PDFFontSubstitutions[i].bold)
+        description.set_weight(PP_BROWSERFONT_TRUSTED_WEIGHT_BOLD);
+      if (PDFFontSubstitutions[i].italic)
+        description.set_italic(true);
+      break;
+    }
+  }
+
+  if (i == arraysize(PDFFontSubstitutions)) {
+    // TODO(kochi): Pass the face in UTF-8. If face is not encoded in UTF-8,
+    // convert to UTF-8 before passing.
+    description.set_face(face);
+  }
+
+  if (!pp::PDF::IsAvailable()) {
+    NOTREACHED();
+    return NULL;
+  }
+
+  PP_Resource font_resource = pp::PDF::GetFontFileWithFallback(
+      pp::InstanceHandle(g_last_instance_id),
+      &description.pp_font_description(),
+      static_cast<PP_PrivateFontCharset>(charset));
+  long res_id = font_resource;
+  return reinterpret_cast<void*>(res_id);
+}
+
+unsigned long GetFontData(struct _FPDF_SYSFONTINFO*, void* font_id,
+                          unsigned int table, unsigned char* buffer,
+                          unsigned long buf_size) {
+  if (!pp::PDF::IsAvailable()) {
+    NOTREACHED();
+    return 0;
+  }
+
+  uint32_t size = buf_size;
+  long res_id = reinterpret_cast<long>(font_id);
+  if (!pp::PDF::GetFontTableForPrivateFontFile(res_id, table, buffer, &size))
+    return 0;
+  return size;
+}
+
+void DeleteFont(struct _FPDF_SYSFONTINFO*, void* font_id) {
+  long res_id = reinterpret_cast<long>(font_id);
+  pp::Module::Get()->core()->ReleaseResource(res_id);
+}
+
+FPDF_SYSFONTINFO g_font_info = {
+  1,
+  0,
+  EnumFonts,
+  MapFont,
+  0,
+  GetFontData,
+  0,
+  0,
+  DeleteFont
+};
+#endif  // defined(OS_LINUX)
+
+void OOM_Handler(_OOM_INFO*) {
+  // Kill the process.  This is important for security, since the code doesn't
+  // NULL-check many memory allocations.  If a malloc fails, returns NULL, and
+  // the buffer is then used, it provides a handy mapping of memory starting at
+  // address 0 for an attacker to utilize.
+  abort();
+  // Paranoia, just in case.
+  *(volatile char*)0 = '\0';
+}
+
+OOM_INFO g_oom_info = {
+  1,
+  OOM_Handler
+};
+
+PDFiumEngine* g_engine_for_unsupported;
+
+void Unsupported_Handler(UNSUPPORT_INFO*, int type) {
+  if (!g_engine_for_unsupported) {
+    NOTREACHED();
+    return;
+  }
+
+  g_engine_for_unsupported->UnsupportedFeature(type);
+}
+
+UNSUPPORT_INFO g_unsuppored_info = {
+  1,
+  Unsupported_Handler
+};
+
+// Set the destination page size and content area in points based on source
+// page rotation and orientation.
+//
+// |rotated| True if source page is rotated 90 degree or 270 degree.
+// |is_src_page_landscape| is true if the source page orientation is landscape.
+// |page_size| has the actual destination page size in points.
+// |content_rect| has the actual destination page printable area values in
+// points.
+void SetPageSizeAndContentRect(bool rotated,
+                               bool is_src_page_landscape,
+                               pp::Size* page_size,
+                               pp::Rect* content_rect) {
+  bool is_dst_page_landscape = page_size->width() > page_size->height();
+  bool page_orientation_mismatched = is_src_page_landscape !=
+                                     is_dst_page_landscape;
+  bool rotate_dst_page = rotated ^ page_orientation_mismatched;
+  if (rotate_dst_page) {
+    page_size->SetSize(page_size->height(), page_size->width());
+    content_rect->SetRect(content_rect->y(), content_rect->x(),
+                          content_rect->height(), content_rect->width());
+  }
+}
+
+// Calculate the scale factor between |content_rect| and a page of size
+// |src_width| x |src_height|.
+//
+// |scale_to_fit| is true, if we need to calculate the scale factor.
+// |content_rect| specifies the printable area of the destination page, with
+// origin at left-bottom. Values are in points.
+// |src_width| specifies the source page width in points.
+// |src_height| specifies the source page height in points.
+// |rotated| True if source page is rotated 90 degree or 270 degree.
+double CalculateScaleFactor(bool scale_to_fit,
+                            const pp::Rect& content_rect,
+                            double src_width, double src_height, bool rotated) {
+  if (!scale_to_fit || src_width == 0 || src_height == 0)
+    return 1.0;
+
+  double actual_source_page_width = rotated ? src_height : src_width;
+  double actual_source_page_height = rotated ? src_width : src_height;
+  double ratio_x = static_cast<double>(content_rect.width()) /
+                   actual_source_page_width;
+  double ratio_y = static_cast<double>(content_rect.height()) /
+                   actual_source_page_height;
+  return std::min(ratio_x, ratio_y);
+}
+
+// Compute source clip box boundaries based on the crop box / media box of
+// source page and scale factor.
+//
+// |page| Handle to the source page. Returned by FPDF_LoadPage function.
+// |scale_factor| specifies the scale factor that should be applied to source
+// clip box boundaries.
+// |rotated| True if source page is rotated 90 degree or 270 degree.
+// |clip_box| out param to hold the computed source clip box values.
+void CalculateClipBoxBoundary(FPDF_PAGE page, double scale_factor, bool rotated,
+                              ClipBox* clip_box) {
+  if (!FPDFPage_GetCropBox(page, &clip_box->left, &clip_box->bottom,
+                           &clip_box->right, &clip_box->top)) {
+    if (!FPDFPage_GetMediaBox(page, &clip_box->left, &clip_box->bottom,
+                              &clip_box->right, &clip_box->top)) {
+      // Make the default size to be letter size (8.5" X 11"). We are just
+      // following the PDFium way of handling these corner cases. PDFium always
+      // consider US-Letter as the default page size.
+      float paper_width = 612;
+      float paper_height = 792;
+      clip_box->left = 0;
+      clip_box->bottom = 0;
+      clip_box->right = rotated ? paper_height : paper_width;
+      clip_box->top = rotated ? paper_width : paper_height;
+    }
+  }
+  clip_box->left *= scale_factor;
+  clip_box->right *= scale_factor;
+  clip_box->bottom *= scale_factor;
+  clip_box->top *= scale_factor;
+}
+
+// Calculate the clip box translation offset for a page that does need to be
+// scaled. All parameters are in points.
+//
+// |content_rect| specifies the printable area of the destination page, with
+// origin at left-bottom.
+// |source_clip_box| specifies the source clip box positions, relative to
+// origin at left-bottom.
+// |offset_x| and |offset_y| will contain the final translation offsets for the
+// source clip box, relative to origin at left-bottom.
+void CalculateScaledClipBoxOffset(const pp::Rect& content_rect,
+                                  const ClipBox& source_clip_box,
+                                  double* offset_x, double* offset_y) {
+  const float clip_box_width = source_clip_box.right - source_clip_box.left;
+  const float clip_box_height = source_clip_box.top - source_clip_box.bottom;
+
+  // Center the intended clip region to real clip region.
+  *offset_x = (content_rect.width() - clip_box_width) / 2 + content_rect.x() -
+              source_clip_box.left;
+  *offset_y = (content_rect.height() - clip_box_height) / 2 + content_rect.y() -
+              source_clip_box.bottom;
+}
+
+// Calculate the clip box offset for a page that does not need to be scaled.
+// All parameters are in points.
+//
+// |content_rect| specifies the printable area of the destination page, with
+// origin at left-bottom.
+// |rotation| specifies the source page rotation values which are N / 90
+// degrees.
+// |page_width| specifies the screen destination page width.
+// |page_height| specifies the screen destination page height.
+// |source_clip_box| specifies the source clip box positions, relative to origin
+// at left-bottom.
+// |offset_x| and |offset_y| will contain the final translation offsets for the
+// source clip box, relative to origin at left-bottom.
+void CalculateNonScaledClipBoxOffset(const pp::Rect& content_rect, int rotation,
+                                     int page_width, int page_height,
+                                     const ClipBox& source_clip_box,
+                                     double* offset_x, double* offset_y) {
+  // Align the intended clip region to left-top corner of real clip region.
+  switch (rotation) {
+    case 0:
+      *offset_x = -1 * source_clip_box.left;
+      *offset_y = page_height - source_clip_box.top;
+      break;
+    case 1:
+      *offset_x = 0;
+      *offset_y = -1 * source_clip_box.bottom;
+      break;
+    case 2:
+      *offset_x = page_width - source_clip_box.right;
+      *offset_y = 0;
+      break;
+    case 3:
+      *offset_x = page_height - source_clip_box.right;
+      *offset_y = page_width - source_clip_box.top;
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+}
+
+// Do an in-place transformation of objects on |page|. Translate all objects on
+// |page| in |source_clip_box| by (|offset_x|, |offset_y|) and scale them by
+// |scale_factor|.
+//
+// |page| Handle to the page. Returned by FPDF_LoadPage function.
+// |source_clip_box| specifies the source clip box positions, relative to
+// origin at left-bottom.
+// |scale_factor| specifies the scale factor that should be applied to page
+// objects.
+// |offset_x| and |offset_y| specifies the translation offsets for the page
+// objects, relative to origin at left-bottom.
+
+void TransformPageObjects(FPDF_PAGE page, const ClipBox& source_clip_box,
+                          const double scale_factor, double offset_x,
+                          double offset_y) {
+  const int obj_count = FPDFPage_CountObject(page);
+
+  // Create a new clip path.
+  FPDF_CLIPPATH clip_path = FPDF_CreateClipPath(
+      source_clip_box.left + offset_x, source_clip_box.bottom + offset_y,
+      source_clip_box.right + offset_x, source_clip_box.top + offset_y);
+
+  for (int obj_idx = 0; obj_idx < obj_count; ++obj_idx) {
+    FPDF_PAGEOBJECT page_obj = FPDFPage_GetObject(page, obj_idx);
+    FPDFPageObj_Transform(page_obj, scale_factor, 0, 0, scale_factor,
+                          offset_x, offset_y);
+    FPDFPageObj_TransformClipPath(page_obj, scale_factor, 0, 0, scale_factor,
+                                  offset_x, offset_y);
+  }
+  FPDFPage_TransformAnnots(page, scale_factor, 0, 0, scale_factor,
+                           offset_x, offset_y);
+  FPDFPage_GenerateContent(page);
+
+  // Add a extra clip path to the new pdf page here.
+  FPDFPage_InsertClipPath(page, clip_path);
+
+  // Destroy the clip path.
+  FPDF_DestroyClipPath(clip_path);
+}
+
+bool InitializeSDK(void* data) {
+  FPDF_InitLibrary(data);
+
+#if defined(OS_LINUX)
+  // Font loading doesn't work in the renderer sandbox in Linux.
+  FPDF_SetSystemFontInfo(&g_font_info);
+#endif
+
+  FSDK_SetOOMHandler(&g_oom_info);
+  FSDK_SetUnSpObjProcessHandler(&g_unsuppored_info);
+
+  return true;
+}
+
+void ShutdownSDK() {
+  FPDF_DestroyLibrary();
+}
+
+PDFEngine* PDFEngine::Create(PDFEngine::Client* client) {
+  return new PDFiumEngine(client);
+}
+
+PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
+    : client_(client),
+      current_zoom_(1.0),
+      current_rotation_(0),
+      doc_loader_(this),
+      password_tries_remaining_(0),
+      doc_(NULL),
+      form_(NULL),
+      defer_page_unload_(false),
+      selecting_(false),
+      next_page_to_search_(-1),
+      last_page_to_search_(-1),
+      last_character_index_to_search_(-1),
+      current_find_index_(-1),
+      permissions_(0),
+      fpdf_availability_(NULL),
+      next_timer_id_(0),
+      last_page_mouse_down_(-1),
+      first_visible_page_(-1),
+      most_visible_page_(-1),
+      called_do_document_action_(false),
+      render_grayscale_(false),
+      progressive_paint_timeout_(0),
+      getting_password_(false) {
+  find_factory_.Initialize(this);
+  password_factory_.Initialize(this);
+
+  file_access_.m_FileLen = 0;
+  file_access_.m_GetBlock = &GetBlock;
+  file_access_.m_Param = &doc_loader_;
+
+  file_availability_.version = 1;
+  file_availability_.IsDataAvail = &IsDataAvail;
+  file_availability_.loader = &doc_loader_;
+
+  download_hints_.version = 1;
+  download_hints_.AddSegment = &AddSegment;
+  download_hints_.loader = &doc_loader_;
+
+  // Initialize FPDF_FORMFILLINFO member variables.  Deriving from this struct
+  // allows the static callbacks to be able to cast the FPDF_FORMFILLINFO in
+  // callbacks to ourself instead of maintaining a map of them to
+  // PDFiumEngine.
+  FPDF_FORMFILLINFO::version = 1;
+  FPDF_FORMFILLINFO::m_pJsPlatform = this;
+  FPDF_FORMFILLINFO::Release = NULL;
+  FPDF_FORMFILLINFO::FFI_Invalidate = Form_Invalidate;
+  FPDF_FORMFILLINFO::FFI_OutputSelectedRect = Form_OutputSelectedRect;
+  FPDF_FORMFILLINFO::FFI_SetCursor = Form_SetCursor;
+  FPDF_FORMFILLINFO::FFI_SetTimer = Form_SetTimer;
+  FPDF_FORMFILLINFO::FFI_KillTimer = Form_KillTimer;
+  FPDF_FORMFILLINFO::FFI_GetLocalTime = Form_GetLocalTime;
+  FPDF_FORMFILLINFO::FFI_OnChange = Form_OnChange;
+  FPDF_FORMFILLINFO::FFI_GetPage = Form_GetPage;
+  FPDF_FORMFILLINFO::FFI_GetCurrentPage = Form_GetCurrentPage;
+  FPDF_FORMFILLINFO::FFI_GetRotation = Form_GetRotation;
+  FPDF_FORMFILLINFO::FFI_ExecuteNamedAction = Form_ExecuteNamedAction;
+  FPDF_FORMFILLINFO::FFI_SetTextFieldFocus = Form_SetTextFieldFocus;
+  FPDF_FORMFILLINFO::FFI_DoURIAction = Form_DoURIAction;
+  FPDF_FORMFILLINFO::FFI_DoGoToAction = Form_DoGoToAction;
+
+  IPDF_JSPLATFORM::version = 1;
+  IPDF_JSPLATFORM::app_alert = Form_Alert;
+  IPDF_JSPLATFORM::app_beep = Form_Beep;
+  IPDF_JSPLATFORM::app_response = Form_Response;
+  IPDF_JSPLATFORM::Doc_getFilePath = Form_GetFilePath;
+  IPDF_JSPLATFORM::Doc_mail = Form_Mail;
+  IPDF_JSPLATFORM::Doc_print = Form_Print;
+  IPDF_JSPLATFORM::Doc_submitForm = Form_SubmitForm;
+  IPDF_JSPLATFORM::Doc_gotoPage = Form_GotoPage;
+  IPDF_JSPLATFORM::Field_browse = Form_Browse;
+
+  IFSDK_PAUSE::version = 1;
+  IFSDK_PAUSE::user = NULL;
+  IFSDK_PAUSE::NeedToPauseNow = Pause_NeedToPauseNow;
+}
+
+PDFiumEngine::~PDFiumEngine() {
+  STLDeleteElements(&pages_);
+  if (doc_) {
+    if (form_) {
+      FORM_DoDocumentAAction(form_, FPDFDOC_AACTION_WC);
+      FPDFDOC_ExitFormFillEnviroument(form_);
+    }
+    FPDF_CloseDocument(doc_);
+  }
+
+  if (fpdf_availability_)
+    FPDFAvail_Destroy(fpdf_availability_);
+}
+
+int PDFiumEngine::GetBlock(void* param, unsigned long position,
+                           unsigned char* buffer, unsigned long size) {
+  DocumentLoader* loader = static_cast<DocumentLoader*>(param);
+  return loader->GetBlock(position, size, buffer);
+}
+
+bool PDFiumEngine::IsDataAvail(FX_FILEAVAIL* param,
+                               size_t offset, size_t size) {
+  PDFiumEngine::FileAvail* file_avail =
+      static_cast<PDFiumEngine::FileAvail*>(param);
+  return file_avail->loader->IsDataAvailable(offset, size);
+}
+
+void PDFiumEngine::AddSegment(FX_DOWNLOADHINTS* param,
+                              size_t offset, size_t size) {
+  PDFiumEngine::DownloadHints* download_hints =
+      static_cast<PDFiumEngine::DownloadHints*>(param);
+  return download_hints->loader->RequestData(offset, size);
+}
+
+bool PDFiumEngine::New(const char* url) {
+  url_ = url;
+  headers_ = std::string();
+  return true;
+}
+
+bool PDFiumEngine::New(const char* url,
+                       const char* headers) {
+  url_ = url;
+  if (!headers)
+    headers_ = std::string();
+  else
+    headers_ = headers;
+  return true;
+}
+
+void PDFiumEngine::PageOffsetUpdated(const pp::Point& page_offset) {
+  page_offset_ = page_offset;
+}
+
+void PDFiumEngine::PluginSizeUpdated(const pp::Size& size) {
+  CancelPaints();
+
+  plugin_size_ = size;
+  CalculateVisiblePages();
+}
+
+void PDFiumEngine::ScrolledToXPosition(int position) {
+  CancelPaints();
+
+  int old_x = position_.x();
+  position_.set_x(position);
+  CalculateVisiblePages();
+  client_->Scroll(pp::Point(old_x - position, 0));
+}
+
+void PDFiumEngine::ScrolledToYPosition(int position) {
+  CancelPaints();
+
+  int old_y = position_.y();
+  position_.set_y(position);
+  CalculateVisiblePages();
+  client_->Scroll(pp::Point(0, old_y - position));
+}
+
+void PDFiumEngine::PrePaint() {
+  for (size_t i = 0; i < progressive_paints_.size(); ++i)
+    progressive_paints_[i].painted_ = false;
+}
+
+void PDFiumEngine::Paint(const pp::Rect& rect,
+                         pp::ImageData* image_data,
+                         std::vector<pp::Rect>* ready,
+                         std::vector<pp::Rect>* pending) {
+  pp::Rect leftover = rect;
+  for (size_t i = 0; i < visible_pages_.size(); ++i) {
+    int index = visible_pages_[i];
+    pp::Rect page_rect = pages_[index]->rect();
+    // Convert the current page's rectangle to screen rectangle.  We do this
+    // instead of the reverse (converting the dirty rectangle from screen to
+    // page coordinates) because then we'd have to convert back to screen
+    // coordinates, and the rounding errors sometime leave pixels dirty or even
+    // move the text up or down a pixel when zoomed.
+    pp::Rect page_rect_in_screen = GetPageScreenRect(index);
+    pp::Rect dirty_in_screen = page_rect_in_screen.Intersect(leftover);
+    if (dirty_in_screen.IsEmpty())
+      continue;
+
+    leftover = leftover.Subtract(dirty_in_screen);
+
+    if (pages_[index]->available()) {
+      int progressive = GetProgressiveIndex(index);
+      if (progressive != -1 &&
+          progressive_paints_[progressive].rect != dirty_in_screen) {
+        // The PDFium code can only handle one progressive paint at a time, so
+        // queue this up. Previously we used to merge the rects when this
+        // happened, but it made scrolling up on complex PDFs very slow since
+        // there would be a damaged rect at the top (from scroll) and at the
+        // bottom (from toolbar).
+        pending->push_back(dirty_in_screen);
+        continue;
+      }
+
+      if (progressive == -1) {
+        progressive = StartPaint(index, dirty_in_screen);
+        progressive_paint_timeout_ = kMaxInitialProgressivePaintTimeMs;
+      } else {
+        progressive_paint_timeout_ = kMaxProgressivePaintTimeMs;
+      }
+
+      progressive_paints_[progressive].painted_ = true;
+      if (ContinuePaint(progressive, image_data)) {
+        FinishPaint(progressive, image_data);
+        ready->push_back(dirty_in_screen);
+      } else {
+        pending->push_back(dirty_in_screen);
+      }
+    } else {
+      PaintUnavailablePage(index, dirty_in_screen, image_data);
+      ready->push_back(dirty_in_screen);
+    }
+  }
+}
+
+void PDFiumEngine::PostPaint() {
+  for (size_t i = 0; i < progressive_paints_.size(); ++i) {
+    if (progressive_paints_[i].painted_)
+      continue;
+
+    // This rectangle must have been merged with another one, that's why we
+    // weren't asked to paint it. Remove it or otherwise we'll never finish
+    // painting.
+    FPDF_RenderPage_Close(
+        pages_[progressive_paints_[i].page_index]->GetPage());
+    FPDFBitmap_Destroy(progressive_paints_[i].bitmap);
+    progressive_paints_.erase(progressive_paints_.begin() + i);
+    --i;
+  }
+}
+
+bool PDFiumEngine::HandleDocumentLoad(const pp::URLLoader& loader) {
+  password_tries_remaining_ = kMaxPasswordTries;
+  return doc_loader_.Init(loader, url_, headers_);
+}
+
+pp::Instance* PDFiumEngine::GetPluginInstance() {
+  return client_->GetPluginInstance();
+}
+
+pp::URLLoader PDFiumEngine::CreateURLLoader() {
+  return client_->CreateURLLoader();
+}
+
+void PDFiumEngine::AppendPage(PDFEngine* engine, int index) {
+  // Unload and delete the blank page before appending.
+  pages_[index]->Unload();
+  pages_[index]->set_calculated_links(false);
+  pp::Size curr_page_size = GetPageSize(index);
+  FPDFPage_Delete(doc_, index);
+  FPDF_ImportPages(doc_,
+                   static_cast<PDFiumEngine*>(engine)->doc(),
+                   "1",
+                   index);
+  pp::Size new_page_size = GetPageSize(index);
+  if (curr_page_size != new_page_size)
+    LoadPageInfo(true);
+  client_->Invalidate(GetPageScreenRect(index));
+}
+
+pp::Point PDFiumEngine::GetScrollPosition() {
+  return position_;
+}
+
+void PDFiumEngine::SetScrollPosition(const pp::Point& position) {
+  position_ = position;
+}
+
+bool PDFiumEngine::IsProgressiveLoad() {
+  return doc_loader_.is_partial_document();
+}
+
+void PDFiumEngine::OnPartialDocumentLoaded() {
+  file_access_.m_FileLen = doc_loader_.document_size();
+  fpdf_availability_ = FPDFAvail_Create(&file_availability_, &file_access_);
+  DCHECK(fpdf_availability_);
+
+  // Currently engine does not deal efficiently with some non-linearized files.
+  // See http://code.google.com/p/chromium/issues/detail?id=59400
+  // To improve user experience we download entire file for non-linearized PDF.
+  if (!FPDFAvail_IsLinearized(fpdf_availability_)) {
+    doc_loader_.RequestData(0, doc_loader_.document_size());
+    return;
+  }
+
+  LoadDocument();
+}
+
+void PDFiumEngine::OnPendingRequestComplete() {
+  if (!doc_ || !form_) {
+    LoadDocument();
+    return;
+  }
+
+  // LoadDocument() will result in |pending_pages_| being reset so there's no
+  // need to run the code below in that case.
+  bool update_pages = false;
+  std::vector<int> still_pending;
+  for (size_t i = 0; i < pending_pages_.size(); ++i) {
+    if (CheckPageAvailable(pending_pages_[i], &still_pending)) {
+      update_pages = true;
+      if (IsPageVisible(pending_pages_[i]))
+        client_->Invalidate(GetPageScreenRect(pending_pages_[i]));
+    }
+  }
+  pending_pages_.swap(still_pending);
+  if (update_pages)
+    LoadPageInfo(true);
+}
+
+void PDFiumEngine::OnNewDataAvailable() {
+  client_->DocumentLoadProgress(doc_loader_.GetAvailableData(),
+                                doc_loader_.document_size());
+}
+
+void PDFiumEngine::OnDocumentComplete() {
+  if (!doc_ || !form_) {
+    file_access_.m_FileLen = doc_loader_.document_size();
+    LoadDocument();
+    return;
+  }
+
+  bool need_update = false;
+  for (size_t i = 0; i < pages_.size(); ++i) {
+    if (pages_[i]->available())
+      continue;
+
+    pages_[i]->set_available(true);
+    // We still need to call IsPageAvail() even if the whole document is
+    // already downloaded.
+    FPDFAvail_IsPageAvail(fpdf_availability_, i, &download_hints_);
+    need_update = true;
+    if (IsPageVisible(i))
+      client_->Invalidate(GetPageScreenRect(i));
+  }
+  if (need_update)
+    LoadPageInfo(true);
+
+  FinishLoadingDocument();
+}
+
+void PDFiumEngine::FinishLoadingDocument() {
+  DCHECK(doc_loader_.IsDocumentComplete() && doc_);
+  if (called_do_document_action_)
+    return;
+  called_do_document_action_ = true;
+
+  // These can only be called now, as the JS might end up needing a page.
+  FORM_DoDocumentJSAction(form_);
+  FORM_DoDocumentOpenAction(form_);
+  if (most_visible_page_ != -1) {
+    FPDF_PAGE new_page = pages_[most_visible_page_]->GetPage();
+    FORM_DoPageAAction(new_page, form_, FPDFPAGE_AACTION_OPEN);
+  }
+
+  if (doc_) // This can only happen if loading |doc_| fails.
+    client_->DocumentLoadComplete(pages_.size());
+}
+
+void PDFiumEngine::UnsupportedFeature(int type) {
+  std::string feature;
+  switch (type) {
+    case FPDF_UNSP_DOC_XFAFORM:
+      feature = "XFA";
+      break;
+    case FPDF_UNSP_DOC_PORTABLECOLLECTION:
+      feature = "Portfolios_Packages";
+      break;
+    case FPDF_UNSP_DOC_ATTACHMENT:
+    case FPDF_UNSP_ANNOT_ATTACHMENT:
+      feature = "Attachment";
+      break;
+    case FPDF_UNSP_DOC_SECURITY:
+      feature = "Rights_Management";
+      break;
+    case FPDF_UNSP_DOC_SHAREDREVIEW:
+      feature = "Shared_Review";
+      break;
+    case FPDF_UNSP_DOC_SHAREDFORM_ACROBAT:
+    case FPDF_UNSP_DOC_SHAREDFORM_FILESYSTEM:
+    case FPDF_UNSP_DOC_SHAREDFORM_EMAIL:
+      feature = "Shared_Form";
+      break;
+    case FPDF_UNSP_ANNOT_3DANNOT:
+      feature = "3D";
+      break;
+    case FPDF_UNSP_ANNOT_MOVIE:
+      feature = "Movie";
+      break;
+    case FPDF_UNSP_ANNOT_SOUND:
+      feature = "Sound";
+      break;
+    case FPDF_UNSP_ANNOT_SCREEN_MEDIA:
+    case FPDF_UNSP_ANNOT_SCREEN_RICHMEDIA:
+      feature = "Screen";
+      break;
+    case FPDF_UNSP_ANNOT_SIG:
+      feature = "Digital_Signature";
+      break;
+  }
+  client_->DocumentHasUnsupportedFeature(feature);
+}
+
+void PDFiumEngine::ContinueFind(int32_t result) {
+  StartFind(current_find_text_.c_str(), !!result);
+}
+
+bool PDFiumEngine::HandleEvent(const pp::InputEvent& event) {
+  DCHECK(!defer_page_unload_);
+  defer_page_unload_ = true;
+  bool rv = false;
+  switch (event.GetType()) {
+    case PP_INPUTEVENT_TYPE_MOUSEDOWN:
+      rv = OnMouseDown(pp::MouseInputEvent(event));
+      break;
+    case PP_INPUTEVENT_TYPE_MOUSEUP:
+      rv = OnMouseUp(pp::MouseInputEvent(event));
+      break;
+    case PP_INPUTEVENT_TYPE_MOUSEMOVE:
+      rv = OnMouseMove(pp::MouseInputEvent(event));
+      break;
+    case PP_INPUTEVENT_TYPE_KEYDOWN:
+      rv = OnKeyDown(pp::KeyboardInputEvent(event));
+      break;
+    case PP_INPUTEVENT_TYPE_KEYUP:
+      rv = OnKeyUp(pp::KeyboardInputEvent(event));
+      break;
+    case PP_INPUTEVENT_TYPE_CHAR:
+      rv = OnChar(pp::KeyboardInputEvent(event));
+      break;
+    default:
+      break;
+  }
+
+  DCHECK(defer_page_unload_);
+  defer_page_unload_ = false;
+  for (size_t i = 0; i < deferred_page_unloads_.size(); ++i)
+    pages_[deferred_page_unloads_[i]]->Unload();
+  deferred_page_unloads_.clear();
+  return rv;
+}
+
+uint32_t PDFiumEngine::QuerySupportedPrintOutputFormats() {
+  if (!HasPermission(PDFEngine::PERMISSION_PRINT_LOW_QUALITY))
+    return 0;
+  return PP_PRINTOUTPUTFORMAT_PDF;
+}
+
+void PDFiumEngine::PrintBegin() {
+  FORM_DoDocumentAAction(form_, FPDFDOC_AACTION_WP);
+}
+
+pp::Resource PDFiumEngine::PrintPages(
+    const PP_PrintPageNumberRange_Dev* page_ranges, uint32_t page_range_count,
+    const PP_PrintSettings_Dev& print_settings) {
+  if (HasPermission(PDFEngine::PERMISSION_PRINT_HIGH_QUALITY))
+    return PrintPagesAsPDF(page_ranges, page_range_count, print_settings);
+  else if (HasPermission(PDFEngine::PERMISSION_PRINT_LOW_QUALITY))
+    return PrintPagesAsRasterPDF(page_ranges, page_range_count, print_settings);
+  return pp::Resource();
+}
+
+pp::Buffer_Dev PDFiumEngine::PrintPagesAsRasterPDF(
+    const PP_PrintPageNumberRange_Dev* page_ranges, uint32_t page_range_count,
+    const PP_PrintSettings_Dev& print_settings) {
+  if (!page_range_count)
+    return pp::Buffer_Dev();
+
+  // If document is not downloaded yet, disable printing.
+  if (doc_ && !doc_loader_.IsDocumentComplete())
+    return pp::Buffer_Dev();
+
+  FPDF_DOCUMENT output_doc = FPDF_CreateNewDocument();
+  if (!output_doc)
+    return pp::Buffer_Dev();
+
+  SaveSelectedFormForPrint();
+
+  std::vector<PDFiumPage> pages_to_print;
+  // width and height of source PDF pages.
+  std::vector<std::pair<double, double> > source_page_sizes;
+  // Collect pages to print and sizes of source pages.
+  std::vector<uint32_t> page_numbers =
+      GetPageNumbersFromPrintPageNumberRange(page_ranges, page_range_count);
+  for (size_t i = 0; i < page_numbers.size(); ++i) {
+    uint32_t page_number = page_numbers[i];
+    FPDF_PAGE pdf_page = FPDF_LoadPage(doc_, page_number);
+    double source_page_width = FPDF_GetPageWidth(pdf_page);
+    double source_page_height = FPDF_GetPageHeight(pdf_page);
+    source_page_sizes.push_back(std::make_pair(source_page_width,
+                                               source_page_height));
+
+    int width_in_pixels = ConvertUnit(source_page_width,
+                                      static_cast<int>(kPointsPerInch),
+                                      print_settings.dpi);
+    int height_in_pixels = ConvertUnit(source_page_height,
+                                       static_cast<int>(kPointsPerInch),
+                                       print_settings.dpi);
+
+    pp::Rect rect(width_in_pixels, height_in_pixels);
+    pages_to_print.push_back(PDFiumPage(this, page_number, rect, true));
+    FPDF_ClosePage(pdf_page);
+  }
+
+#if defined(OS_LINUX)
+  g_last_instance_id = client_->GetPluginInstance()->pp_instance();
+#endif
+
+  size_t i = 0;
+  for (; i < pages_to_print.size(); ++i) {
+    double source_page_width = source_page_sizes[i].first;
+    double source_page_height = source_page_sizes[i].second;
+    const pp::Size& bitmap_size(pages_to_print[i].rect().size());
+
+    // Use temp_doc to compress image by saving PDF to buffer.
+    FPDF_DOCUMENT temp_doc = FPDF_CreateNewDocument();
+    if (!temp_doc)
+      break;
+
+    FPDF_PAGE output_page = FPDFPage_New(temp_doc, 0, source_page_width,
+                                         source_page_height);
+
+    pp::ImageData image = pp::ImageData(client_->GetPluginInstance(),
+                                        PP_IMAGEDATAFORMAT_BGRA_PREMUL,
+                                        bitmap_size,
+                                        false);
+
+    FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(bitmap_size.width(),
+                                             bitmap_size.height(),
+                                             FPDFBitmap_BGRx,
+                                             image.data(),
+                                             image.stride());
+
+    // Clear the bitmap
+    FPDFBitmap_FillRect(bitmap, 0, 0, bitmap_size.width(),
+                        bitmap_size.height(), 255, 255, 255, 255);
+
+    pp::Rect page_rect = pages_to_print[i].rect();
+    FPDF_RenderPageBitmap(bitmap, pages_to_print[i].GetPrintPage(),
+                          page_rect.x(), page_rect.y(),
+                          page_rect.width(), page_rect.height(),
+                          print_settings.orientation,
+                          FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
+
+    double ratio_x = (static_cast<double>(bitmap_size.width()) *
+                          kPointsPerInch) / print_settings.dpi;
+    double ratio_y = (static_cast<double>(bitmap_size.height()) *
+                         kPointsPerInch) / print_settings.dpi;
+
+    // Add the bitmap to an image object and add the image object to the output
+    // page.
+    FPDF_PAGEOBJECT img_obj = FPDFPageObj_NewImgeObj(output_doc);
+    FPDFImageObj_SetBitmap(&output_page, 1, img_obj, bitmap);
+    FPDFImageObj_SetMatrix(img_obj, ratio_x, 0, 0, ratio_y, 0, 0);
+    FPDFPage_InsertObject(output_page, img_obj);
+    FPDFPage_GenerateContent(output_page);
+    FPDF_ClosePage(output_page);
+
+    pages_to_print[i].ClosePrintPage();
+    FPDFBitmap_Destroy(bitmap);
+
+    pp::Buffer_Dev buffer = GetFlattenedPrintData(temp_doc);
+    FPDF_CloseDocument(temp_doc);
+
+    PDFiumMemBufferFileRead file_read(buffer.data(), buffer.size());
+    temp_doc = FPDF_LoadCustomDocument(&file_read, NULL);
+    if (!temp_doc)
+      break;
+
+    FPDF_BOOL imported = FPDF_ImportPages(output_doc, temp_doc, "1", i);
+    FPDF_CloseDocument(temp_doc);
+    if (!imported)
+      break;
+  }
+
+  pp::Buffer_Dev buffer;
+  if (i == pages_to_print.size()) {
+    FPDF_CopyViewerPreferences(output_doc, doc_);
+    FitContentsToPrintableAreaIfRequired(output_doc, print_settings);
+    // Now flatten all the output pages.
+    buffer = GetFlattenedPrintData(output_doc);
+  }
+  FPDF_CloseDocument(output_doc);
+  return buffer;
+}
+
+pp::Buffer_Dev PDFiumEngine::GetFlattenedPrintData(const FPDF_DOCUMENT& doc) {
+  int page_count = FPDF_GetPageCount(doc);
+  bool flatten_succeeded = true;
+  for (int i = 0; i < page_count; ++i) {
+    FPDF_PAGE page = FPDF_LoadPage(doc, i);
+    DCHECK(page);
+    if (page) {
+      int flatten_ret = FPDFPage_Flatten(page, FLAT_PRINT);
+      FPDF_ClosePage(page);
+      if (flatten_ret == FLATTEN_FAIL) {
+        flatten_succeeded = false;
+        break;
+      }
+    } else {
+      flatten_succeeded = false;
+      break;
+    }
+  }
+  if (!flatten_succeeded) {
+    FPDF_CloseDocument(doc);
+    return pp::Buffer_Dev();
+  }
+
+  pp::Buffer_Dev buffer;
+  PDFiumMemBufferFileWrite output_file_write;
+  if (FPDF_SaveAsCopy(doc, &output_file_write, 0)) {
+    buffer = pp::Buffer_Dev(
+        client_->GetPluginInstance(), output_file_write.size());
+    if (!buffer.is_null()) {
+      memcpy(buffer.data(), output_file_write.buffer().c_str(),
+             output_file_write.size());
+    }
+  }
+  return buffer;
+}
+
+pp::Buffer_Dev PDFiumEngine::PrintPagesAsPDF(
+    const PP_PrintPageNumberRange_Dev* page_ranges, uint32_t page_range_count,
+    const PP_PrintSettings_Dev& print_settings) {
+  if (!page_range_count)
+    return pp::Buffer_Dev();
+
+  DCHECK(doc_);
+  FPDF_DOCUMENT output_doc = FPDF_CreateNewDocument();
+  if (!output_doc)
+    return pp::Buffer_Dev();
+
+  SaveSelectedFormForPrint();
+
+  std::string page_number_str;
+  for (uint32_t index = 0; index < page_range_count; ++index) {
+    if (!page_number_str.empty())
+      page_number_str.append(",");
+    page_number_str.append(
+        base::IntToString(page_ranges[index].first_page_number + 1));
+    if (page_ranges[index].first_page_number !=
+            page_ranges[index].last_page_number) {
+      page_number_str.append("-");
+      page_number_str.append(
+          base::IntToString(page_ranges[index].last_page_number + 1));
+    }
+  }
+
+  std::vector<uint32_t> page_numbers =
+      GetPageNumbersFromPrintPageNumberRange(page_ranges, page_range_count);
+  for (size_t i = 0; i < page_numbers.size(); ++i) {
+    uint32_t page_number = page_numbers[i];
+    pages_[page_number]->GetPage();
+    if (!IsPageVisible(page_numbers[i]))
+      pages_[page_number]->Unload();
+  }
+
+  FPDF_CopyViewerPreferences(output_doc, doc_);
+  if (!FPDF_ImportPages(output_doc, doc_, page_number_str.c_str(), 0)) {
+    FPDF_CloseDocument(output_doc);
+    return pp::Buffer_Dev();
+  }
+
+  FitContentsToPrintableAreaIfRequired(output_doc, print_settings);
+
+  // Now flatten all the output pages.
+  pp::Buffer_Dev buffer = GetFlattenedPrintData(output_doc);
+  FPDF_CloseDocument(output_doc);
+  return buffer;
+}
+
+void PDFiumEngine::FitContentsToPrintableAreaIfRequired(
+    const FPDF_DOCUMENT& doc, const PP_PrintSettings_Dev& print_settings) {
+  // Check to see if we need to fit pdf contents to printer paper size.
+  if (print_settings.print_scaling_option !=
+          PP_PRINTSCALINGOPTION_SOURCE_SIZE) {
+    int num_pages = FPDF_GetPageCount(doc);
+    // In-place transformation is more efficient than creating a new
+    // transformed document from the source document. Therefore, transform
+    // every page to fit the contents in the selected printer paper.
+    for (int i = 0; i < num_pages; ++i) {
+      FPDF_PAGE page = FPDF_LoadPage(doc, i);
+      TransformPDFPageForPrinting(page, print_settings);
+      FPDF_ClosePage(page);
+    }
+  }
+}
+
+void PDFiumEngine::SaveSelectedFormForPrint() {
+  FORM_ForceToKillFocus(form_);
+  client_->FormTextFieldFocusChange(false);
+}
+
+void PDFiumEngine::PrintEnd() {
+  FORM_DoDocumentAAction(form_, FPDFDOC_AACTION_DP);
+}
+
+PDFiumPage::Area PDFiumEngine::GetCharIndex(
+    const pp::MouseInputEvent& event, int* page_index,
+    int* char_index, PDFiumPage::LinkTarget* target) {
+  // First figure out which page this is in.
+  pp::Point mouse_point = event.GetPosition();
+  pp::Point point(
+      static_cast<int>((mouse_point.x() + position_.x()) / current_zoom_),
+      static_cast<int>((mouse_point.y() + position_.y()) / current_zoom_));
+  return GetCharIndex(point, page_index, char_index, target);
+}
+
+PDFiumPage::Area PDFiumEngine::GetCharIndex(
+    const pp::Point& point,
+    int* page_index,
+    int* char_index,
+    PDFiumPage::LinkTarget* target) {
+  int page = -1;
+  for (size_t i = 0; i < visible_pages_.size(); ++i) {
+    if (pages_[visible_pages_[i]]->rect().Contains(point)) {
+      page = visible_pages_[i];
+      break;
+    }
+  }
+  if (page == -1)
+    return PDFiumPage::NONSELECTABLE_AREA;
+
+  // If the page hasn't finished rendering, calling into the page sometimes
+  // leads to hangs.
+  for (size_t i = 0; i < progressive_paints_.size(); ++i) {
+    if (progressive_paints_[i].page_index == page)
+      return PDFiumPage::NONSELECTABLE_AREA;
+  }
+
+  *page_index = page;
+  return pages_[page]->GetCharIndex(point, current_rotation_, char_index,
+                                    target);
+}
+
+bool PDFiumEngine::OnMouseDown(const pp::MouseInputEvent& event) {
+  if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT)
+    return false;
+
+  SelectionChangeInvalidator selection_invalidator(this);
+  selection_.clear();
+
+  int page_index = -1;
+  int char_index = -1;
+  PDFiumPage::LinkTarget target;
+  PDFiumPage::Area area = GetCharIndex(event, &page_index,
+                                       &char_index, &target);
+  if (area == PDFiumPage::WEBLINK_AREA) {
+    bool open_in_new_tab = !!(event.GetModifiers() & kDefaultKeyModifier);
+    client_->NavigateTo(target.url, open_in_new_tab);
+    client_->FormTextFieldFocusChange(false);
+    return true;
+  }
+
+  if (area == PDFiumPage::DOCLINK_AREA) {
+    client_->ScrollToPage(target.page);
+    client_->FormTextFieldFocusChange(false);
+    return true;
+  }
+
+  if (page_index != -1) {
+    last_page_mouse_down_ = page_index;
+    double page_x, page_y;
+    pp::Point point = event.GetPosition();
+    DeviceToPage(page_index, point.x(), point.y(), &page_x, &page_y);
+
+    FORM_OnLButtonDown(form_, pages_[page_index]->GetPage(), 0, page_x, page_y);
+    int control = FPDPage_HasFormFieldAtPoint(
+        form_, pages_[page_index]->GetPage(), page_x, page_y);
+    if (control > FPDF_FORMFIELD_UNKNOWN) {  // returns -1 sometimes...
+      client_->FormTextFieldFocusChange(control == FPDF_FORMFIELD_TEXTFIELD ||
+          control == FPDF_FORMFIELD_COMBOBOX);
+      return true;  // Return now before we get into the selection code.
+    }
+  }
+
+  client_->FormTextFieldFocusChange(false);
+
+  if (area != PDFiumPage::TEXT_AREA)
+    return true;  // Return true so WebKit doesn't do its own highlighting.
+
+  if (event.GetClickCount() == 1) {
+    OnSingleClick(page_index, char_index);
+  } else if (event.GetClickCount() == 2 ||
+             event.GetClickCount() == 3) {
+    OnMultipleClick(event.GetClickCount(), page_index, char_index);
+  }
+
+  return true;
+}
+
+void PDFiumEngine::OnSingleClick(int page_index, int char_index) {
+  selecting_ = true;
+  selection_.push_back(PDFiumRange(pages_[page_index], char_index, 0));
+}
+
+void PDFiumEngine::OnMultipleClick(int click_count,
+                                   int page_index,
+                                   int char_index) {
+  // It would be more efficient if the SDK could support finding a space, but
+  // now it doesn't.
+  int start_index = char_index;
+  do {
+    base::char16 cur = pages_[page_index]->GetCharAtIndex(start_index);
+    // For double click, we want to select one word so we look for whitespace
+    // boundaries.  For triple click, we want the whole line.
+    if (cur == '\n' || (click_count == 2 && (cur == ' ' || cur == '\t')))
+      break;
+  } while (--start_index >= 0);
+  if (start_index)
+    start_index++;
+
+  int end_index = char_index;
+  int total = pages_[page_index]->GetCharCount();
+  while (end_index++ <= total) {
+    base::char16 cur = pages_[page_index]->GetCharAtIndex(end_index);
+    if (cur == '\n' || (click_count == 2 && (cur == ' ' || cur == '\t')))
+      break;
+  }
+
+  selection_.push_back(PDFiumRange(
+      pages_[page_index], start_index, end_index - start_index));
+}
+
+bool PDFiumEngine::OnMouseUp(const pp::MouseInputEvent& event) {
+  if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT)
+    return false;
+
+  int page_index = -1;
+  int char_index = -1;
+  GetCharIndex(event, &page_index, &char_index, NULL);
+  if (page_index != -1) {
+    double page_x, page_y;
+    pp::Point point = event.GetPosition();
+    DeviceToPage(page_index, point.x(), point.y(), &page_x, &page_y);
+    FORM_OnLButtonUp(
+        form_, pages_[page_index]->GetPage(), 0, page_x, page_y);
+  }
+
+  if (!selecting_)
+    return false;
+
+  selecting_ = false;
+  return true;
+}
+
+bool PDFiumEngine::OnMouseMove(const pp::MouseInputEvent& event) {
+  int page_index = -1;
+  int char_index = -1;
+  PDFiumPage::Area area = GetCharIndex(event, &page_index, &char_index, NULL);
+  if (!selecting_) {
+    PP_CursorType_Dev cursor;
+    switch (area) {
+      case PDFiumPage::TEXT_AREA:
+        cursor = PP_CURSORTYPE_IBEAM;
+        break;
+      case PDFiumPage::WEBLINK_AREA:
+      case PDFiumPage::DOCLINK_AREA:
+        cursor = PP_CURSORTYPE_HAND;
+        break;
+      case PDFiumPage::NONSELECTABLE_AREA:
+      default:
+        cursor = PP_CURSORTYPE_POINTER;
+        break;
+    }
+
+    if (page_index != -1) {
+      double page_x, page_y;
+      pp::Point point = event.GetPosition();
+      DeviceToPage(page_index, point.x(), point.y(), &page_x, &page_y);
+
+      FORM_OnMouseMove(form_, pages_[page_index]->GetPage(), 0, page_x, page_y);
+      int control = FPDPage_HasFormFieldAtPoint(
+          form_, pages_[page_index]->GetPage(), page_x, page_y);
+      switch (control) {
+        case FPDF_FORMFIELD_PUSHBUTTON:
+        case FPDF_FORMFIELD_CHECKBOX:
+        case FPDF_FORMFIELD_RADIOBUTTON:
+        case FPDF_FORMFIELD_COMBOBOX:
+        case FPDF_FORMFIELD_LISTBOX:
+          cursor = PP_CURSORTYPE_HAND;
+          break;
+        case FPDF_FORMFIELD_TEXTFIELD:
+          cursor = PP_CURSORTYPE_IBEAM;
+          break;
+        default:
+          break;
+      }
+    }
+
+    client_->UpdateCursor(cursor);
+    pp::Point point = event.GetPosition();
+    std::string url = GetLinkAtPosition(event.GetPosition());
+    if (url != link_under_cursor_) {
+      link_under_cursor_ = url;
+      pp::PDF::SetLinkUnderCursor(GetPluginInstance(), url.c_str());
+    }
+    // No need to swallow the event, since this might interfere with the
+    // scrollbars if the user is dragging them.
+    return false;
+  }
+
+  // We're selecting but right now we're not over text, so don't change the
+  // current selection.
+  if (area != PDFiumPage::TEXT_AREA && area != PDFiumPage::WEBLINK_AREA &&
+      area != PDFiumPage::DOCLINK_AREA) {
+    return false;
+  }
+
+  SelectionChangeInvalidator selection_invalidator(this);
+
+  // Check if the user has descreased their selection area and we need to remove
+  // pages from selection_.
+  for (size_t i = 0; i < selection_.size(); ++i) {
+    if (selection_[i].page_index() == page_index) {
+      // There should be no other pages after this.
+      selection_.erase(selection_.begin() + i + 1, selection_.end());
+      break;
+    }
+  }
+
+  if (selection_.size() == 0)
+    return false;
+
+  int last = selection_.size() - 1;
+  if (selection_[last].page_index() == page_index) {
+    // Selecting within a page.
+    int count;
+    if (char_index >= selection_[last].char_index()) {
+      // Selecting forward.
+      count = char_index - selection_[last].char_index() + 1;
+    } else {
+      count = char_index - selection_[last].char_index() - 1;
+    }
+    selection_[last].SetCharCount(count);
+  } else if (selection_[last].page_index() < page_index) {
+    // Selecting into the next page.
+
+    // First make sure that there are no gaps in selection, i.e. if mousedown on
+    // page one but we only get mousemove over page three, we want page two.
+    for (int i = selection_[last].page_index() + 1; i < page_index; ++i) {
+      selection_.push_back(PDFiumRange(pages_[i], 0,
+                           pages_[i]->GetCharCount()));
+    }
+
+    int count = pages_[selection_[last].page_index()]->GetCharCount();
+    selection_[last].SetCharCount(count - selection_[last].char_index());
+    selection_.push_back(PDFiumRange(pages_[page_index], 0, char_index));
+  } else {
+    // Selecting into the previous page.
+    selection_[last].SetCharCount(-selection_[last].char_index());
+
+    // First make sure that there are no gaps in selection, i.e. if mousedown on
+    // page three but we only get mousemove over page one, we want page two.
+    for (int i = selection_[last].page_index() - 1; i > page_index; --i) {
+      selection_.push_back(PDFiumRange(pages_[i], 0,
+                           pages_[i]->GetCharCount()));
+    }
+
+    int count = pages_[page_index]->GetCharCount();
+    selection_.push_back(
+        PDFiumRange(pages_[page_index], count, count - char_index));
+  }
+
+  return true;
+}
+
+bool PDFiumEngine::OnKeyDown(const pp::KeyboardInputEvent& event) {
+  if (last_page_mouse_down_ == -1)
+    return false;
+
+  bool rv = !!FORM_OnKeyDown(
+      form_, pages_[last_page_mouse_down_]->GetPage(),
+      event.GetKeyCode(), event.GetModifiers());
+
+  if (event.GetKeyCode() == ui::VKEY_BACK ||
+      event.GetKeyCode() == ui::VKEY_ESCAPE) {
+    // Chrome doesn't send char events for backspace or escape keys, see
+    // PlatformKeyboardEventBuilder::isCharacterKey() and
+    // http://chrome-corpsvn.mtv.corp.google.com/viewvc?view=rev&root=chrome&revision=31805
+    // for more information.  So just fake one since PDFium uses it.
+    std::string str;
+    str.push_back(event.GetKeyCode());
+    pp::KeyboardInputEvent synthesized(pp::KeyboardInputEvent(
+        client_->GetPluginInstance(),
+        PP_INPUTEVENT_TYPE_CHAR,
+        event.GetTimeStamp(),
+        event.GetModifiers(),
+        event.GetKeyCode(),
+        str));
+    OnChar(synthesized);
+  }
+
+  return rv;
+}
+
+bool PDFiumEngine::OnKeyUp(const pp::KeyboardInputEvent& event) {
+  if (last_page_mouse_down_ == -1)
+    return false;
+
+  return !!FORM_OnKeyUp(
+      form_, pages_[last_page_mouse_down_]->GetPage(),
+      event.GetKeyCode(), event.GetModifiers());
+}
+
+bool PDFiumEngine::OnChar(const pp::KeyboardInputEvent& event) {
+  if (last_page_mouse_down_ == -1)
+    return false;
+
+  base::string16 str = base::UTF8ToUTF16(event.GetCharacterText().AsString());
+  return !!FORM_OnChar(
+      form_, pages_[last_page_mouse_down_]->GetPage(),
+      str[0],
+      event.GetModifiers());
+}
+
+void PDFiumEngine::StartFind(const char* text, bool case_sensitive) {
+  // We can get a call to StartFind before we have any page information (i.e.
+  // before the first call to LoadDocument has happened). Handle this case.
+  if (pages_.empty())
+    return;
+
+  bool first_search = false;
+  int character_to_start_searching_from = 0;
+  if (current_find_text_ != text) {  // First time we search for this text.
+    first_search = true;
+    std::vector<PDFiumRange> old_selection = selection_;
+    StopFind();
+    current_find_text_ = text;
+
+    if (old_selection.empty()) {
+      // Start searching from the beginning of the document.
+      next_page_to_search_ = 0;
+      last_page_to_search_ = pages_.size() - 1;
+      last_character_index_to_search_ = -1;
+    } else {
+      // There's a current selection, so start from it.
+      next_page_to_search_ = old_selection[0].page_index();
+      last_character_index_to_search_ = old_selection[0].char_index();
+      character_to_start_searching_from = old_selection[0].char_index();
+      last_page_to_search_ = next_page_to_search_;
+    }
+  }
+
+  int current_page = next_page_to_search_;
+
+  if (pages_[current_page]->available()) {
+    base::string16 str = base::UTF8ToUTF16(text);
+    // Don't use PDFium to search for now, since it doesn't support unicode text.
+    // Leave the code for now to avoid bit-rot, in case it's fixed later.
+    if (0) {
+      SearchUsingPDFium(
+          str, case_sensitive, first_search, character_to_start_searching_from,
+          current_page);
+    } else {
+      SearchUsingICU(
+          str, case_sensitive, first_search, character_to_start_searching_from,
+          current_page);
+    }
+
+    if (!IsPageVisible(current_page))
+      pages_[current_page]->Unload();
+  }
+
+  if (next_page_to_search_ != last_page_to_search_ ||
+      (first_search && last_character_index_to_search_ != -1)) {
+    ++next_page_to_search_;
+  }
+
+  if (next_page_to_search_ == static_cast<int>(pages_.size()))
+    next_page_to_search_ = 0;
+  // If there's only one page in the document and we start searching midway,
+  // then we'll want to search the page one more time.
+  bool end_of_search =
+      next_page_to_search_ == last_page_to_search_ &&
+      // Only one page but didn't start midway.
+      ((pages_.size() == 1 && last_character_index_to_search_ == -1) ||
+       // Started midway, but only 1 page and we already looped around.
+       (pages_.size() == 1 && !first_search) ||
+       // Started midway, and we've just looped around.
+       (pages_.size() > 1 && current_page == next_page_to_search_));
+
+  if (end_of_search) {
+    // Send the final notification.
+    client_->NotifyNumberOfFindResultsChanged(find_results_.size(), true);
+  } else {
+    pp::CompletionCallback callback =
+        find_factory_.NewCallback(&PDFiumEngine::ContinueFind);
+    pp::Module::Get()->core()->CallOnMainThread(
+        0, callback, case_sensitive ? 1 : 0);
+  }
+}
+
+void PDFiumEngine::SearchUsingPDFium(const base::string16& term,
+                                     bool case_sensitive,
+                                     bool first_search,
+                                     int character_to_start_searching_from,
+                                     int current_page) {
+  // Find all the matches in the current page.
+  unsigned long flags = case_sensitive ? FPDF_MATCHCASE : 0;
+  FPDF_SCHHANDLE find = FPDFText_FindStart(
+      pages_[current_page]->GetTextPage(),
+      reinterpret_cast<const unsigned short*>(term.c_str()),
+      flags, character_to_start_searching_from);
+
+  // Note: since we search one page at a time, we don't find matches across
+  // page boundaries.  We could do this manually ourself, but it seems low
+  // priority since Reader itself doesn't do it.
+  while (FPDFText_FindNext(find)) {
+    PDFiumRange result(pages_[current_page],
+                       FPDFText_GetSchResultIndex(find),
+                       FPDFText_GetSchCount(find));
+
+    if (!first_search &&
+        last_character_index_to_search_ != -1 &&
+        result.page_index() == last_page_to_search_ &&
+        result.char_index() >= last_character_index_to_search_) {
+      break;
+    }
+
+    AddFindResult(result);
+  }
+
+  FPDFText_FindClose(find);
+}
+
+void PDFiumEngine::SearchUsingICU(const base::string16& term,
+                                  bool case_sensitive,
+                                  bool first_search,
+                                  int character_to_start_searching_from,
+                                  int current_page) {
+  base::string16 page_text;
+  int text_length = pages_[current_page]->GetCharCount();
+  if (character_to_start_searching_from) {
+    text_length -= character_to_start_searching_from;
+  } else if (!first_search &&
+             last_character_index_to_search_ != -1 &&
+             current_page == last_page_to_search_) {
+    text_length = last_character_index_to_search_;
+  }
+  if (text_length <= 0)
+    return;
+  unsigned short* data =
+      reinterpret_cast<unsigned short*>(WriteInto(&page_text, text_length + 1));
+  FPDFText_GetText(pages_[current_page]->GetTextPage(),
+                   character_to_start_searching_from,
+                   text_length,
+                   data);
+  std::vector<PDFEngine::Client::SearchStringResult> results;
+  client_->SearchString(
+      page_text.c_str(), term.c_str(), case_sensitive, &results);
+  for (size_t i = 0; i < results.size(); ++i) {
+    // Need to map the indexes from the page text, which may have generated
+    // characters like space etc, to character indices from the page.
+    int temp_start = results[i].start_index + character_to_start_searching_from;
+    int start = FPDFText_GetCharIndexFromTextIndex(
+        pages_[current_page]->GetTextPage(), temp_start);
+    int end = FPDFText_GetCharIndexFromTextIndex(
+        pages_[current_page]->GetTextPage(),
+        temp_start + results[i].length);
+    AddFindResult(PDFiumRange(pages_[current_page], start, end - start));
+  }
+}
+
+void PDFiumEngine::AddFindResult(const PDFiumRange& result) {
+  // Figure out where to insert the new location, since we could have
+  // started searching midway and now we wrapped.
+  size_t i;
+  int page_index = result.page_index();
+  int char_index = result.char_index();
+  for (i = 0; i < find_results_.size(); ++i) {
+    if (find_results_[i].page_index() > page_index ||
+        (find_results_[i].page_index() == page_index &&
+         find_results_[i].char_index() > char_index)) {
+      break;
+    }
+  }
+  find_results_.insert(find_results_.begin() + i, result);
+  UpdateTickMarks();
+
+  if (current_find_index_ == -1) {
+    // Select the first match.
+    SelectFindResult(true);
+  } else if (static_cast<int>(i) <= current_find_index_) {
+    // Update the current match index
+    current_find_index_++;
+    client_->NotifySelectedFindResultChanged(current_find_index_);
+  }
+  client_->NotifyNumberOfFindResultsChanged(find_results_.size(), false);
+}
+
+bool PDFiumEngine::SelectFindResult(bool forward) {
+  if (find_results_.empty()) {
+    NOTREACHED();
+    return false;
+  }
+
+  SelectionChangeInvalidator selection_invalidator(this);
+
+  // Move back/forward through the search locations we previously found.
+  if (forward) {
+    if (++current_find_index_ == static_cast<int>(find_results_.size()))
+      current_find_index_ = 0;
+  } else {
+    if (--current_find_index_ < 0) {
+      current_find_index_ = find_results_.size() - 1;
+    }
+  }
+
+  // Update the selection before telling the client to scroll, since it could
+  // paint then.
+  selection_.clear();
+  selection_.push_back(find_results_[current_find_index_]);
+
+  // If the result is not in view, scroll to it.
+  size_t i;
+  pp::Rect bounding_rect;
+  pp::Rect visible_rect = GetVisibleRect();
+  // Use zoom of 1.0 since visible_rect is without zoom.
+  std::vector<pp::Rect> rects = find_results_[current_find_index_].
+      GetScreenRects(pp::Point(), 1.0, current_rotation_);
+  for (i = 0; i < rects.size(); ++i)
+    bounding_rect = bounding_rect.Union(rects[i]);
+  if (!visible_rect.Contains(bounding_rect)) {
+    pp::Point center = bounding_rect.CenterPoint();
+    // Make the page centered.
+    int new_y = static_cast<int>(center.y() * current_zoom_) -
+                static_cast<int>(visible_rect.height() * current_zoom_ / 2);
+    if (new_y < 0)
+      new_y = 0;
+    client_->ScrollToY(new_y);
+
+    // Only move horizontally if it's not visible.
+    if (center.x() < visible_rect.x() || center.x() > visible_rect.right()) {
+      int new_x = static_cast<int>(center.x()  * current_zoom_) -
+                  static_cast<int>(visible_rect.width() * current_zoom_ / 2);
+      if (new_x < 0)
+        new_x = 0;
+      client_->ScrollToX(new_x);
+    }
+  }
+
+  client_->NotifySelectedFindResultChanged(current_find_index_);
+
+  return true;
+}
+
+void PDFiumEngine::StopFind() {
+  SelectionChangeInvalidator selection_invalidator(this);
+
+  selection_.clear();
+  selecting_ = false;
+  find_results_.clear();
+  next_page_to_search_ = -1;
+  last_page_to_search_ = -1;
+  last_character_index_to_search_ = -1;
+  current_find_index_ = -1;
+  current_find_text_.clear();
+  UpdateTickMarks();
+  find_factory_.CancelAll();
+}
+
+void PDFiumEngine::UpdateTickMarks() {
+  std::vector<pp::Rect> tickmarks;
+  for (size_t i = 0; i < find_results_.size(); ++i) {
+    pp::Rect rect;
+    // Always use an origin of 0,0 since scroll positions don't affect tickmark.
+    std::vector<pp::Rect> rects = find_results_[i].GetScreenRects(
+      pp::Point(0, 0), current_zoom_, current_rotation_);
+    for (size_t j = 0; j < rects.size(); ++j)
+      rect = rect.Union(rects[j]);
+    tickmarks.push_back(rect);
+  }
+
+  client_->UpdateTickMarks(tickmarks);
+}
+
+void PDFiumEngine::ZoomUpdated(double new_zoom_level) {
+  CancelPaints();
+
+  current_zoom_ = new_zoom_level;
+
+  CalculateVisiblePages();
+  UpdateTickMarks();
+}
+
+void PDFiumEngine::RotateClockwise() {
+  current_rotation_ = (current_rotation_ + 1) % 4;
+  InvalidateAllPages();
+}
+
+void PDFiumEngine::RotateCounterclockwise() {
+  current_rotation_ = (current_rotation_ - 1) % 4;
+  InvalidateAllPages();
+}
+
+void PDFiumEngine::InvalidateAllPages() {
+  selection_.clear();
+  find_results_.clear();
+
+  CancelPaints();
+  LoadPageInfo(true);
+  UpdateTickMarks();
+  client_->Invalidate(pp::Rect(plugin_size_));
+}
+
+std::string PDFiumEngine::GetSelectedText() {
+  base::string16 result;
+  for (size_t i = 0; i < selection_.size(); ++i) {
+    if (i > 0 &&
+        selection_[i - 1].page_index() > selection_[i].page_index()) {
+      result = selection_[i].GetText() + result;
+    } else {
+      result.append(selection_[i].GetText());
+    }
+  }
+
+  return base::UTF16ToUTF8(result);
+}
+
+std::string PDFiumEngine::GetLinkAtPosition(const pp::Point& point) {
+  int temp;
+  PDFiumPage::LinkTarget target;
+  PDFiumPage::Area area = GetCharIndex(point, &temp, &temp, &target);
+  if (area == PDFiumPage::WEBLINK_AREA)
+    return target.url;
+  return std::string();
+}
+
+bool PDFiumEngine::IsSelecting() {
+  return selecting_;
+}
+
+bool PDFiumEngine::HasPermission(DocumentPermission permission) const {
+  switch (permission) {
+    case PERMISSION_COPY:
+      return (permissions_ & kPDFPermissionCopyMask) != 0;
+    case PERMISSION_COPY_ACCESSIBLE:
+      return (permissions_ & kPDFPermissionCopyAccessibleMask) != 0;
+    case PERMISSION_PRINT_LOW_QUALITY:
+      return (permissions_ & kPDFPermissionPrintLowQualityMask) != 0;
+    case PERMISSION_PRINT_HIGH_QUALITY:
+      return (permissions_ & kPDFPermissionPrintLowQualityMask) != 0 &&
+             (permissions_ & kPDFPermissionPrintHighQualityMask) != 0;
+    default:
+      return true;
+  };
+}
+
+void PDFiumEngine::SelectAll() {
+  SelectionChangeInvalidator selection_invalidator(this);
+
+  selection_.clear();
+  for (size_t i = 0; i < pages_.size(); ++i)
+    if (pages_[i]->available()) {
+      selection_.push_back(PDFiumRange(pages_[i], 0,
+                           pages_[i]->GetCharCount()));
+    }
+}
+
+int PDFiumEngine::GetNumberOfPages() {
+  return pages_.size();
+}
+
+int PDFiumEngine::GetNamedDestinationPage(const std::string& destination) {
+  // Look for the destination.
+  FPDF_DEST dest = FPDF_GetNamedDestByName(doc_, destination.c_str());
+  if (!dest) {
+    // Look for a bookmark with the same name.
+    base::string16 destination_wide = base::UTF8ToUTF16(destination);
+    FPDF_WIDESTRING destination_pdf_wide =
+        reinterpret_cast<FPDF_WIDESTRING>(destination_wide.c_str());
+    FPDF_BOOKMARK bookmark = FPDFBookmark_Find(doc_, destination_pdf_wide);
+    if (!bookmark)
+      return -1;
+    dest = FPDFBookmark_GetDest(doc_, bookmark);
+  }
+  return dest ? FPDFDest_GetPageIndex(doc_, dest) : -1;
+}
+
+int PDFiumEngine::GetFirstVisiblePage() {
+  CalculateVisiblePages();
+  return first_visible_page_;
+}
+
+int PDFiumEngine::GetMostVisiblePage() {
+  CalculateVisiblePages();
+  return most_visible_page_;
+}
+
+pp::Rect PDFiumEngine::GetPageRect(int index) {
+  pp::Rect rc(pages_[index]->rect());
+  rc.Inset(-kPageShadowLeft, -kPageShadowTop,
+           -kPageShadowRight, -kPageShadowBottom);
+  return rc;
+}
+
+pp::Rect PDFiumEngine::GetPageContentsRect(int index) {
+  return GetScreenRect(pages_[index]->rect());
+}
+
+void PDFiumEngine::PaintThumbnail(pp::ImageData* image_data, int index) {
+  FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(
+      image_data->size().width(), image_data->size().height(),
+      FPDFBitmap_BGRx, image_data->data(), image_data->stride());
+
+  if (pages_[index]->available()) {
+    FPDFBitmap_FillRect(
+        bitmap, 0, 0, image_data->size().width(), image_data->size().height(),
+        255, 255, 255, 255);
+
+    FPDF_RenderPageBitmap(
+        bitmap, pages_[index]->GetPage(), 0, 0, image_data->size().width(),
+        image_data->size().height(), 0, GetRenderingFlags());
+  } else {
+    FPDFBitmap_FillRect(
+        bitmap, 0, 0, image_data->size().width(), image_data->size().height(),
+        kPendingPageColorR, kPendingPageColorG, kPendingPageColorB,
+        kPendingPageColorA);
+  }
+
+  FPDFBitmap_Destroy(bitmap);
+}
+
+void PDFiumEngine::SetGrayscale(bool grayscale) {
+  render_grayscale_ = grayscale;
+}
+
+void PDFiumEngine::OnCallback(int id) {
+  if (!timers_.count(id))
+    return;
+
+  timers_[id].second(id);
+  if (timers_.count(id))  // The callback might delete the timer.
+    client_->ScheduleCallback(id, timers_[id].first);
+}
+
+std::string PDFiumEngine::GetPageAsJSON(int index) {
+  if (!(HasPermission(PERMISSION_COPY) ||
+        HasPermission(PERMISSION_COPY_ACCESSIBLE))) {
+    return "{}";
+  }
+
+  if (index < 0 || static_cast<size_t>(index) > pages_.size() - 1)
+    return "{}";
+
+  scoped_ptr<base::Value> node(
+      pages_[index]->GetAccessibleContentAsValue(current_rotation_));
+  std::string page_json;
+  base::JSONWriter::Write(node.get(), &page_json);
+  return page_json;
+}
+
+bool PDFiumEngine::GetPrintScaling() {
+  return !!FPDF_VIEWERREF_GetPrintScaling(doc_);
+}
+
+void PDFiumEngine::AppendBlankPages(int num_pages) {
+  DCHECK(num_pages != 0);
+
+  if (!doc_)
+    return;
+
+  selection_.clear();
+  pending_pages_.clear();
+
+  // Delete all pages except the first one.
+  while (pages_.size() > 1) {
+    delete pages_.back();
+    pages_.pop_back();
+    FPDFPage_Delete(doc_, pages_.size());
+  }
+
+  // Calculate document size and all page sizes.
+  std::vector<pp::Rect> page_rects;
+  pp::Size page_size = GetPageSize(0);
+  page_size.Enlarge(kPageShadowLeft + kPageShadowRight,
+                    kPageShadowTop + kPageShadowBottom);
+  pp::Size old_document_size = document_size_;
+  document_size_ = pp::Size(page_size.width(), 0);
+  for (int i = 0; i < num_pages; ++i) {
+    if (i != 0) {
+      // Add space for horizontal separator.
+      document_size_.Enlarge(0, kPageSeparatorThickness);
+    }
+
+    pp::Rect rect(pp::Point(0, document_size_.height()), page_size);
+    page_rects.push_back(rect);
+
+    document_size_.Enlarge(0, page_size.height());
+  }
+
+  // Create blank pages.
+  for (int i = 1; i < num_pages; ++i) {
+    pp::Rect page_rect(page_rects[i]);
+    page_rect.Inset(kPageShadowLeft, kPageShadowTop,
+                    kPageShadowRight, kPageShadowBottom);
+    double width_in_points =
+        page_rect.width() * kPointsPerInch / kPixelsPerInch;
+    double height_in_points =
+        page_rect.height() * kPointsPerInch / kPixelsPerInch;
+    FPDFPage_New(doc_, i, width_in_points, height_in_points);
+    pages_.push_back(new PDFiumPage(this, i, page_rect, true));
+  }
+
+  CalculateVisiblePages();
+  if (document_size_ != old_document_size)
+    client_->DocumentSizeUpdated(document_size_);
+}
+
+void PDFiumEngine::LoadDocument() {
+  // Check if the document is ready for loading. If it isn't just bail for now,
+  // we will call LoadDocument() again later.
+  if (!doc_ && !doc_loader_.IsDocumentComplete() &&
+      !FPDFAvail_IsDocAvail(fpdf_availability_, &download_hints_)) {
+    return;
+  }
+
+  // If we're in the middle of getting a password, just return. We will retry
+  // loading the document after we get the password anyway.
+  if (getting_password_)
+    return;
+
+  ScopedUnsupportedFeature scoped_unsupported_feature(this);
+  bool needs_password = false;
+  if (TryLoadingDoc(false, std::string(), &needs_password)) {
+    ContinueLoadingDocument(false, std::string());
+    return;
+  }
+  if (needs_password)
+    GetPasswordAndLoad();
+  else
+    client_->DocumentLoadFailed();
+}
+
+bool PDFiumEngine::TryLoadingDoc(bool with_password,
+                                 const std::string& password,
+                                 bool* needs_password) {
+  *needs_password = false;
+  if (doc_)
+    return true;
+
+  const char* password_cstr = NULL;
+  if (with_password) {
+    password_cstr = password.c_str();
+    password_tries_remaining_--;
+  }
+  if (doc_loader_.IsDocumentComplete())
+    doc_ = FPDF_LoadCustomDocument(&file_access_, password_cstr);
+  else
+    doc_ = FPDFAvail_GetDocument(fpdf_availability_, password_cstr);
+
+  if (!doc_ && FPDF_GetLastError() == FPDF_ERR_PASSWORD)
+    *needs_password = true;
+
+  return doc_ != NULL;
+}
+
+void PDFiumEngine::GetPasswordAndLoad() {
+  getting_password_ = true;
+  DCHECK(!doc_ && FPDF_GetLastError() == FPDF_ERR_PASSWORD);
+  client_->GetDocumentPassword(password_factory_.NewCallbackWithOutput(
+      &PDFiumEngine::OnGetPasswordComplete));
+}
+
+void PDFiumEngine::OnGetPasswordComplete(int32_t result,
+                                         const pp::Var& password) {
+  getting_password_ = false;
+
+  bool password_given = false;
+  std::string password_text;
+  if (result == PP_OK && password.is_string()) {
+    password_text = password.AsString();
+    if (!password_text.empty())
+      password_given = true;
+  }
+  ContinueLoadingDocument(password_given, password_text);
+}
+
+void PDFiumEngine::ContinueLoadingDocument(
+    bool has_password,
+    const std::string& password) {
+  ScopedUnsupportedFeature scoped_unsupported_feature(this);
+
+  bool needs_password = false;
+  bool loaded = TryLoadingDoc(has_password, password, &needs_password);
+  bool password_incorrect = !loaded && has_password && needs_password;
+  if (password_incorrect && password_tries_remaining_ > 0) {
+    GetPasswordAndLoad();
+    return;
+  }
+
+  if (!doc_) {
+    client_->DocumentLoadFailed();
+    return;
+  }
+
+  if (FPDFDoc_GetPageMode(doc_) == PAGEMODE_USEOUTLINES)
+    client_->DocumentHasUnsupportedFeature("Bookmarks");
+
+  permissions_ = FPDF_GetDocPermissions(doc_);
+
+  if (!form_) {
+    // Only returns 0 when data isn't available.  If form data is downloaded, or
+    // if this isn't a form, returns positive values.
+    if (!doc_loader_.IsDocumentComplete() &&
+        !FPDFAvail_IsFormAvail(fpdf_availability_, &download_hints_)) {
+      return;
+    }
+
+    form_ = FPDFDOC_InitFormFillEnviroument(
+        doc_, static_cast<FPDF_FORMFILLINFO*>(this));
+    FPDF_SetFormFieldHighlightColor(form_, 0, kFormHighlightColor);
+    FPDF_SetFormFieldHighlightAlpha(form_, kFormHighlightAlpha);
+  }
+
+  if (!doc_loader_.IsDocumentComplete()) {
+    // Check if the first page is available.  In a linearized PDF, that is not
+    // always page 0.  Doing this gives us the default page size, since when the
+    // document is available, the first page is available as well.
+    CheckPageAvailable(FPDFAvail_GetFirstPageNum(doc_), &pending_pages_);
+  }
+
+  LoadPageInfo(false);
+
+  if (doc_loader_.IsDocumentComplete())
+    FinishLoadingDocument();
+}
+
+void PDFiumEngine::LoadPageInfo(bool reload) {
+  pending_pages_.clear();
+  pp::Size old_document_size = document_size_;
+  document_size_ = pp::Size();
+  std::vector<pp::Rect> page_rects;
+  int page_count = FPDF_GetPageCount(doc_);
+  bool doc_complete = doc_loader_.IsDocumentComplete();
+  for (int i = 0; i < page_count; ++i) {
+    if (i != 0) {
+      // Add space for horizontal separator.
+      document_size_.Enlarge(0, kPageSeparatorThickness);
+    }
+
+    // Get page availability. If reload==false, and document is not loaded yet
+    // (we are using async loading) - mark all pages as unavailable.
+    // If reload==true (we have document constructed already), get page
+    // availability flag from already existing PDFiumPage class.
+    bool page_available = reload ? pages_[i]->available() : doc_complete;
+
+    pp::Size size = page_available ? GetPageSize(i) : default_page_size_;
+    size.Enlarge(kPageShadowLeft + kPageShadowRight,
+                 kPageShadowTop + kPageShadowBottom);
+    pp::Rect rect(pp::Point(0, document_size_.height()), size);
+    page_rects.push_back(rect);
+
+    if (size.width() > document_size_.width())
+      document_size_.set_width(size.width());
+
+    document_size_.Enlarge(0, size.height());
+  }
+
+  for (int i = 0; i < page_count; ++i) {
+    // Center pages relative to the entire document.
+    page_rects[i].set_x((document_size_.width() - page_rects[i].width()) / 2);
+    pp::Rect page_rect(page_rects[i]);
+    page_rect.Inset(kPageShadowLeft, kPageShadowTop,
+                    kPageShadowRight, kPageShadowBottom);
+    if (reload) {
+      pages_[i]->set_rect(page_rect);
+    } else {
+      pages_.push_back(new PDFiumPage(this, i, page_rect, doc_complete));
+    }
+  }
+
+  CalculateVisiblePages();
+  if (document_size_ != old_document_size)
+    client_->DocumentSizeUpdated(document_size_);
+}
+
+void PDFiumEngine::CalculateVisiblePages() {
+  // Clear pending requests queue, since it may contain requests to the pages
+  // that are already invisible (after scrolling for example).
+  pending_pages_.clear();
+  doc_loader_.ClearPendingRequests();
+
+  visible_pages_.clear();
+  pp::Rect visible_rect(plugin_size_);
+  for (size_t i = 0; i < pages_.size(); ++i) {
+    // Check an entire PageScreenRect, since we might need to repaint side
+    // borders and shadows even if the page itself is not visible.
+    // For example, when user use pdf with different page sizes and zoomed in
+    // outside page area.
+    if (visible_rect.Intersects(GetPageScreenRect(i))) {
+      visible_pages_.push_back(i);
+      CheckPageAvailable(i, &pending_pages_);
+    } else {
+      // Need to unload pages when we're not using them, since some PDFs use a
+      // lot of memory.  See http://crbug.com/48791
+      if (defer_page_unload_) {
+        deferred_page_unloads_.push_back(i);
+      } else {
+        pages_[i]->Unload();
+      }
+
+      // If the last mouse down was on a page that's no longer visible, reset
+      // that variable so that we don't send keyboard events to it (the focus
+      // will be lost when the page is first closed anyways).
+      if (static_cast<int>(i) == last_page_mouse_down_)
+        last_page_mouse_down_ = -1;
+    }
+  }
+
+  // Any pending highlighting of form fields will be invalid since these are in
+  // screen coordinates.
+  form_highlights_.clear();
+
+  if (visible_pages_.size() == 0)
+    first_visible_page_ = -1;
+  else
+    first_visible_page_ = visible_pages_.front();
+
+  int most_visible_page = first_visible_page_;
+  // Check if the next page is more visible than the first one.
+  if (most_visible_page != -1 &&
+      pages_.size() > 0 &&
+      most_visible_page < static_cast<int>(pages_.size()) - 1) {
+    pp::Rect rc_first =
+        visible_rect.Intersect(GetPageScreenRect(most_visible_page));
+    pp::Rect rc_next =
+        visible_rect.Intersect(GetPageScreenRect(most_visible_page + 1));
+    if (rc_next.height() > rc_first.height())
+      most_visible_page++;
+  }
+
+  SetCurrentPage(most_visible_page);
+}
+
+bool PDFiumEngine::IsPageVisible(int index) const {
+  for (size_t i = 0; i < visible_pages_.size(); ++i) {
+    if (visible_pages_[i] == index)
+      return true;
+  }
+
+  return false;
+}
+
+bool PDFiumEngine::CheckPageAvailable(int index, std::vector<int>* pending) {
+  if (!doc_ || !form_)
+    return false;
+
+  if (static_cast<int>(pages_.size()) > index && pages_[index]->available())
+    return true;
+
+  if (!FPDFAvail_IsPageAvail(fpdf_availability_, index, &download_hints_)) {
+    size_t j;
+    for (j = 0; j < pending->size(); ++j) {
+      if ((*pending)[j] == index)
+        break;
+    }
+
+    if (j == pending->size())
+      pending->push_back(index);
+    return false;
+  }
+
+  if (static_cast<int>(pages_.size()) > index)
+    pages_[index]->set_available(true);
+  if (!default_page_size_.GetArea())
+    default_page_size_ = GetPageSize(index);
+  return true;
+}
+
+pp::Size PDFiumEngine::GetPageSize(int index) {
+  pp::Size size;
+  double width_in_points = 0;
+  double height_in_points = 0;
+  int rv = FPDF_GetPageSizeByIndex(
+      doc_, index, &width_in_points, &height_in_points);
+
+  if (rv) {
+    int width_in_pixels = static_cast<int>(
+        width_in_points * kPixelsPerInch / kPointsPerInch);
+    int height_in_pixels = static_cast<int>(
+        height_in_points * kPixelsPerInch / kPointsPerInch);
+    if (current_rotation_ % 2 == 1)
+      std::swap(width_in_pixels, height_in_pixels);
+    size = pp::Size(width_in_pixels, height_in_pixels);
+  }
+  return size;
+}
+
+int PDFiumEngine::StartPaint(int page_index, const pp::Rect& dirty) {
+  // For the first time we hit paint, do nothing and just record the paint for
+  // the next callback.  This keeps the UI responsive in case the user is doing
+  // a lot of scrolling.
+  ProgressivePaint progressive;
+  progressive.rect = dirty;
+  progressive.page_index = page_index;
+  progressive.bitmap = NULL;
+  progressive.painted_ = false;
+  progressive_paints_.push_back(progressive);
+  return progressive_paints_.size() - 1;
+}
+
+bool PDFiumEngine::ContinuePaint(int progressive_index,
+                                 pp::ImageData* image_data) {
+#if defined(OS_LINUX)
+  g_last_instance_id = client_->GetPluginInstance()->pp_instance();
+#endif
+
+  int rv;
+  int page_index = progressive_paints_[progressive_index].page_index;
+  last_progressive_start_time_ = base::Time::Now();
+  if (progressive_paints_[progressive_index].bitmap) {
+    rv = FPDF_RenderPage_Continue(
+        pages_[page_index]->GetPage(), static_cast<IFSDK_PAUSE*>(this));
+  } else {
+    pp::Rect dirty = progressive_paints_[progressive_index].rect;
+    progressive_paints_[progressive_index].bitmap = CreateBitmap(dirty,
+                                                                 image_data);
+    int start_x, start_y, size_x, size_y;
+    GetPDFiumRect(
+        page_index, dirty, &start_x, &start_y, &size_x, &size_y);
+    FPDFBitmap_FillRect(
+        progressive_paints_[progressive_index].bitmap, start_x, start_y, size_x,
+        size_y, 255, 255, 255, 255);
+    rv = FPDF_RenderPageBitmap_Start(
+        progressive_paints_[progressive_index].bitmap,
+        pages_[page_index]->GetPage(), start_x, start_y, size_x, size_y,
+        current_rotation_,
+        GetRenderingFlags(), static_cast<IFSDK_PAUSE*>(this));
+  }
+  return rv != FPDF_RENDER_TOBECOUNTINUED;
+}
+
+void PDFiumEngine::FinishPaint(int progressive_index,
+                               pp::ImageData* image_data) {
+  int page_index = progressive_paints_[progressive_index].page_index;
+  pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
+  FPDF_BITMAP bitmap = progressive_paints_[progressive_index].bitmap;
+  int start_x, start_y, size_x, size_y;
+  GetPDFiumRect(
+      page_index, dirty_in_screen, &start_x, &start_y, &size_x, &size_y);
+
+  // Draw the forms.
+  FPDF_FFLDraw(
+      form_, bitmap, pages_[page_index]->GetPage(), start_x, start_y, size_x,
+      size_y, current_rotation_, GetRenderingFlags());
+
+  FillPageSides(progressive_index);
+
+  // Paint the page shadows.
+  PaintPageShadow(progressive_index, image_data);
+
+  DrawSelections(progressive_index, image_data);
+
+  FPDF_RenderPage_Close(pages_[page_index]->GetPage());
+  FPDFBitmap_Destroy(bitmap);
+  progressive_paints_.erase(progressive_paints_.begin() + progressive_index);
+
+  client_->DocumentPaintOccurred();
+}
+
+void PDFiumEngine::CancelPaints() {
+  for (size_t i = 0; i < progressive_paints_.size(); ++i) {
+    FPDF_RenderPage_Close(pages_[progressive_paints_[i].page_index]->GetPage());
+    FPDFBitmap_Destroy(progressive_paints_[i].bitmap);
+  }
+  progressive_paints_.clear();
+}
+
+void PDFiumEngine::FillPageSides(int progressive_index) {
+  int page_index = progressive_paints_[progressive_index].page_index;
+  pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
+  FPDF_BITMAP bitmap = progressive_paints_[progressive_index].bitmap;
+
+  pp::Rect page_rect = pages_[page_index]->rect();
+  if (page_rect.x() > 0) {
+    pp::Rect left(0,
+                  page_rect.y() - kPageShadowTop,
+                  page_rect.x() - kPageShadowLeft,
+                  page_rect.height() + kPageShadowTop +
+                      kPageShadowBottom + kPageSeparatorThickness);
+    left = GetScreenRect(left).Intersect(dirty_in_screen);
+
+    FPDFBitmap_FillRect(
+        bitmap, left.x() - dirty_in_screen.x(),
+        left.y() - dirty_in_screen.y(), left.width(), left.height(),
+        kBackgroundColorR, kBackgroundColorG, kBackgroundColorB,
+        kBackgroundColorA);
+  }
+
+  if (page_rect.right() < document_size_.width()) {
+    pp::Rect right(page_rect.right() + kPageShadowRight,
+                   page_rect.y() - kPageShadowTop,
+                   document_size_.width() - page_rect.right() -
+                      kPageShadowRight,
+                   page_rect.height() + kPageShadowTop +
+                       kPageShadowBottom + kPageSeparatorThickness);
+    right = GetScreenRect(right).Intersect(dirty_in_screen);
+
+    FPDFBitmap_FillRect(
+        bitmap, right.x() - dirty_in_screen.x(),
+        right.y() - dirty_in_screen.y(), right.width(), right.height(),
+        kBackgroundColorR, kBackgroundColorG, kBackgroundColorB,
+        kBackgroundColorA);
+  }
+
+  // Paint separator.
+  pp::Rect bottom(page_rect.x() - kPageShadowLeft,
+                  page_rect.bottom() + kPageShadowBottom,
+                  page_rect.width() + kPageShadowLeft + kPageShadowRight,
+                  kPageSeparatorThickness);
+  bottom = GetScreenRect(bottom).Intersect(dirty_in_screen);
+
+  FPDFBitmap_FillRect(
+      bitmap, bottom.x() - dirty_in_screen.x(),
+      bottom.y() - dirty_in_screen.y(), bottom.width(), bottom.height(),
+      kBackgroundColorR, kBackgroundColorG, kBackgroundColorB,
+      kBackgroundColorA);
+}
+
+void PDFiumEngine::PaintPageShadow(int progressive_index,
+                                   pp::ImageData* image_data) {
+  int page_index = progressive_paints_[progressive_index].page_index;
+  pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
+  pp::Rect page_rect = pages_[page_index]->rect();
+  pp::Rect shadow_rect(page_rect);
+  shadow_rect.Inset(-kPageShadowLeft, -kPageShadowTop,
+                    -kPageShadowRight, -kPageShadowBottom);
+
+  // Due to the rounding errors of the GetScreenRect it is possible to get
+  // different size shadows on the left and right sides even they are defined
+  // the same. To fix this issue let's calculate shadow rect and then shrink
+  // it by the size of the shadows.
+  shadow_rect = GetScreenRect(shadow_rect);
+  page_rect = shadow_rect;
+
+  page_rect.Inset(static_cast<int>(ceil(kPageShadowLeft * current_zoom_)),
+                  static_cast<int>(ceil(kPageShadowTop * current_zoom_)),
+                  static_cast<int>(ceil(kPageShadowRight * current_zoom_)),
+                  static_cast<int>(ceil(kPageShadowBottom * current_zoom_)));
+
+  DrawPageShadow(page_rect, shadow_rect, dirty_in_screen, image_data);
+}
+
+void PDFiumEngine::DrawSelections(int progressive_index,
+                                  pp::ImageData* image_data) {
+  int page_index = progressive_paints_[progressive_index].page_index;
+  pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
+
+  void* region = NULL;
+  int stride;
+  GetRegion(dirty_in_screen.point(), image_data, &region, &stride);
+
+  std::vector<pp::Rect> highlighted_rects;
+  pp::Rect visible_rect = GetVisibleRect();
+  for (size_t k = 0; k < selection_.size(); ++k) {
+    if (selection_[k].page_index() != page_index)
+      continue;
+    std::vector<pp::Rect> rects = selection_[k].GetScreenRects(
+        visible_rect.point(), current_zoom_, current_rotation_);
+    for (size_t j = 0; j < rects.size(); ++j) {
+      pp::Rect visible_selection = rects[j].Intersect(dirty_in_screen);
+      if (visible_selection.IsEmpty())
+        continue;
+
+      visible_selection.Offset(
+          -dirty_in_screen.point().x(), -dirty_in_screen.point().y());
+      Highlight(region, stride, visible_selection, &highlighted_rects);
+    }
+  }
+
+  for (size_t k = 0; k < form_highlights_.size(); ++k) {
+    pp::Rect visible_selection = form_highlights_[k].Intersect(dirty_in_screen);
+      if (visible_selection.IsEmpty())
+        continue;
+
+    visible_selection.Offset(
+        -dirty_in_screen.point().x(), -dirty_in_screen.point().y());
+    Highlight(region, stride, visible_selection, &highlighted_rects);
+  }
+  form_highlights_.clear();
+}
+
+void PDFiumEngine::PaintUnavailablePage(int page_index,
+                                        const pp::Rect& dirty,
+                                        pp::ImageData* image_data) {
+  int start_x, start_y, size_x, size_y;
+  GetPDFiumRect(page_index, dirty, &start_x, &start_y, &size_x, &size_y);
+  FPDF_BITMAP bitmap = CreateBitmap(dirty, image_data);
+  FPDFBitmap_FillRect(bitmap, start_x, start_y, size_x, size_y,
+      kPendingPageColorR, kPendingPageColorG, kPendingPageColorB,
+      kPendingPageColorA);
+
+  pp::Rect loading_text_in_screen(
+      pages_[page_index]->rect().width() / 2,
+      pages_[page_index]->rect().y() + kLoadingTextVerticalOffset, 0, 0);
+  loading_text_in_screen = GetScreenRect(loading_text_in_screen);
+  FPDFBitmap_Destroy(bitmap);
+}
+
+int PDFiumEngine::GetProgressiveIndex(int page_index) const {
+  for (size_t i = 0; i < progressive_paints_.size(); ++i) {
+    if (progressive_paints_[i].page_index == page_index)
+      return i;
+  }
+  return -1;
+}
+
+FPDF_BITMAP PDFiumEngine::CreateBitmap(const pp::Rect& rect,
+                                       pp::ImageData* image_data) const {
+  void* region;
+  int stride;
+  GetRegion(rect.point(), image_data, &region, &stride);
+  if (!region)
+    return NULL;
+  return FPDFBitmap_CreateEx(
+      rect.width(), rect.height(), FPDFBitmap_BGRx, region, stride);
+}
+
+void PDFiumEngine::GetPDFiumRect(
+    int page_index, const pp::Rect& rect, int* start_x, int* start_y,
+    int* size_x, int* size_y) const {
+  pp::Rect page_rect = GetScreenRect(pages_[page_index]->rect());
+  page_rect.Offset(-rect.x(), -rect.y());
+
+  *start_x = page_rect.x();
+  *start_y = page_rect.y();
+  *size_x = page_rect.width();
+  *size_y = page_rect.height();
+}
+
+int PDFiumEngine::GetRenderingFlags() const {
+  int flags = FPDF_LCD_TEXT | FPDF_NO_CATCH;
+  if (render_grayscale_)
+    flags |= FPDF_GRAYSCALE;
+  if (client_->IsPrintPreview())
+    flags |= FPDF_PRINTING;
+  return flags;
+}
+
+pp::Rect PDFiumEngine::GetVisibleRect() const {
+  pp::Rect rv;
+  rv.set_x(static_cast<int>(position_.x() / current_zoom_));
+  rv.set_y(static_cast<int>(position_.y() / current_zoom_));
+  rv.set_width(static_cast<int>(ceil(plugin_size_.width() / current_zoom_)));
+  rv.set_height(static_cast<int>(ceil(plugin_size_.height() / current_zoom_)));
+  return rv;
+}
+
+pp::Rect PDFiumEngine::GetPageScreenRect(int page_index) const {
+  // Since we use this rect for creating the PDFium bitmap, also include other
+  // areas around the page that we might need to update such as the page
+  // separator and the sides if the page is narrower than the document.
+  return GetScreenRect(pp::Rect(
+      0,
+      pages_[page_index]->rect().y() - kPageShadowTop,
+      document_size_.width(),
+      pages_[page_index]->rect().height() + kPageShadowTop +
+          kPageShadowBottom + kPageSeparatorThickness));
+}
+
+pp::Rect PDFiumEngine::GetScreenRect(const pp::Rect& rect) const {
+  pp::Rect rv;
+  int right =
+      static_cast<int>(ceil(rect.right() * current_zoom_ - position_.x()));
+  int bottom =
+    static_cast<int>(ceil(rect.bottom() * current_zoom_ - position_.y()));
+
+  rv.set_x(static_cast<int>(rect.x() * current_zoom_ - position_.x()));
+  rv.set_y(static_cast<int>(rect.y() * current_zoom_ - position_.y()));
+  rv.set_width(right - rv.x());
+  rv.set_height(bottom - rv.y());
+  return rv;
+}
+
+void PDFiumEngine::Highlight(void* buffer,
+                             int stride,
+                             const pp::Rect& rect,
+                             std::vector<pp::Rect>* highlighted_rects) {
+  if (!buffer)
+    return;
+
+  pp::Rect new_rect = rect;
+  for (size_t i = 0; i < highlighted_rects->size(); ++i)
+    new_rect = new_rect.Subtract((*highlighted_rects)[i]);
+
+  highlighted_rects->push_back(new_rect);
+  int l = new_rect.x();
+  int t = new_rect.y();
+  int w = new_rect.width();
+  int h = new_rect.height();
+
+  for (int y = t; y < t + h; ++y) {
+    for (int x = l; x < l + w; ++x) {
+      uint8* pixel = static_cast<uint8*>(buffer) + y * stride + x * 4;
+      //  This is our highlight color.
+      pixel[0] = static_cast<uint8>(
+          pixel[0] * (kHighlightColorB / 255.0));
+      pixel[1] = static_cast<uint8>(
+          pixel[1] * (kHighlightColorG / 255.0));
+      pixel[2] = static_cast<uint8>(
+          pixel[2] * (kHighlightColorR / 255.0));
+    }
+  }
+}
+
+PDFiumEngine::SelectionChangeInvalidator::SelectionChangeInvalidator(
+    PDFiumEngine* engine) : engine_(engine) {
+  previous_origin_ = engine_->GetVisibleRect().point();
+  GetVisibleSelectionsScreenRects(&old_selections_);
+}
+
+PDFiumEngine::SelectionChangeInvalidator::~SelectionChangeInvalidator() {
+  // Offset the old selections if the document scrolled since we recorded them.
+  pp::Point offset = previous_origin_ - engine_->GetVisibleRect().point();
+  for (size_t i = 0; i < old_selections_.size(); ++i)
+    old_selections_[i].Offset(offset);
+
+  std::vector<pp::Rect> new_selections;
+  GetVisibleSelectionsScreenRects(&new_selections);
+  for (size_t i = 0; i < new_selections.size(); ++i) {
+    for (size_t j = 0; j < old_selections_.size(); ++j) {
+      if (new_selections[i] == old_selections_[j]) {
+        // Rectangle was selected before and after, so no need to invalidate it.
+        // Mark the rectangles by setting them to empty.
+        new_selections[i] = old_selections_[j] = pp::Rect();
+      }
+    }
+  }
+
+  for (size_t i = 0; i < old_selections_.size(); ++i) {
+    if (!old_selections_[i].IsEmpty())
+      engine_->client_->Invalidate(old_selections_[i]);
+  }
+  for (size_t i = 0; i < new_selections.size(); ++i) {
+    if (!new_selections[i].IsEmpty())
+      engine_->client_->Invalidate(new_selections[i]);
+  }
+  engine_->OnSelectionChanged();
+}
+
+void
+PDFiumEngine::SelectionChangeInvalidator::GetVisibleSelectionsScreenRects(
+    std::vector<pp::Rect>* rects) {
+  pp::Rect visible_rect = engine_->GetVisibleRect();
+  for (size_t i = 0; i < engine_->selection_.size(); ++i) {
+    int page_index = engine_->selection_[i].page_index();
+    if (!engine_->IsPageVisible(page_index))
+      continue;  // This selection is on a page that's not currently visible.
+
+    std::vector<pp::Rect> selection_rects =
+        engine_->selection_[i].GetScreenRects(
+            visible_rect.point(),
+            engine_->current_zoom_,
+            engine_->current_rotation_);
+    rects->insert(rects->end(), selection_rects.begin(), selection_rects.end());
+  }
+}
+
+void PDFiumEngine::DeviceToPage(int page_index,
+                                float device_x,
+                                float device_y,
+                                double* page_x,
+                                double* page_y) {
+  *page_x = *page_y = 0;
+  int temp_x = static_cast<int>((device_x + position_.x())/ current_zoom_ -
+      pages_[page_index]->rect().x());
+  int temp_y = static_cast<int>((device_y + position_.y())/ current_zoom_ -
+      pages_[page_index]->rect().y());
+  FPDF_DeviceToPage(
+      pages_[page_index]->GetPage(), 0, 0,
+      pages_[page_index]->rect().width(),  pages_[page_index]->rect().height(),
+      current_rotation_, temp_x, temp_y, page_x, page_y);
+}
+
+int PDFiumEngine::GetVisiblePageIndex(FPDF_PAGE page) {
+  for (size_t i = 0; i < visible_pages_.size(); ++i) {
+    if (pages_[visible_pages_[i]]->GetPage() == page)
+      return visible_pages_[i];
+  }
+  return -1;
+}
+
+void PDFiumEngine::SetCurrentPage(int index) {
+  if (index == most_visible_page_ || !form_)
+    return;
+  if (most_visible_page_ != -1 && called_do_document_action_) {
+    FPDF_PAGE old_page = pages_[most_visible_page_]->GetPage();
+    FORM_DoPageAAction(old_page, form_, FPDFPAGE_AACTION_CLOSE);
+  }
+  most_visible_page_ = index;
+#if defined(OS_LINUX)
+    g_last_instance_id = client_->GetPluginInstance()->pp_instance();
+#endif
+  if (most_visible_page_ != -1 && called_do_document_action_) {
+    FPDF_PAGE new_page = pages_[most_visible_page_]->GetPage();
+    FORM_DoPageAAction(new_page, form_, FPDFPAGE_AACTION_OPEN);
+  }
+}
+
+void PDFiumEngine::TransformPDFPageForPrinting(
+    FPDF_PAGE page,
+    const PP_PrintSettings_Dev& print_settings) {
+  // Get the source page width and height in points.
+  const double src_page_width = FPDF_GetPageWidth(page);
+  const double src_page_height = FPDF_GetPageHeight(page);
+
+  const int src_page_rotation = FPDFPage_GetRotation(page);
+  const bool fit_to_page = print_settings.print_scaling_option ==
+      PP_PRINTSCALINGOPTION_FIT_TO_PRINTABLE_AREA;
+
+  pp::Size page_size(print_settings.paper_size);
+  pp::Rect content_rect(print_settings.printable_area);
+  const bool rotated = (src_page_rotation % 2 == 1);
+  SetPageSizeAndContentRect(rotated,
+                            src_page_width > src_page_height,
+                            &page_size,
+                            &content_rect);
+
+  // Compute the screen page width and height in points.
+  const int actual_page_width =
+      rotated ? page_size.height() : page_size.width();
+  const int actual_page_height =
+      rotated ? page_size.width() : page_size.height();
+
+  const double scale_factor = CalculateScaleFactor(fit_to_page, content_rect,
+                                                   src_page_width,
+                                                   src_page_height, rotated);
+
+  // Calculate positions for the clip box.
+  ClipBox source_clip_box;
+  CalculateClipBoxBoundary(page, scale_factor, rotated, &source_clip_box);
+
+  // Calculate the translation offset values.
+  double offset_x = 0;
+  double offset_y = 0;
+  if (fit_to_page) {
+    CalculateScaledClipBoxOffset(content_rect, source_clip_box, &offset_x,
+                                 &offset_y);
+  } else {
+    CalculateNonScaledClipBoxOffset(content_rect, src_page_rotation,
+                                    actual_page_width, actual_page_height,
+                                    source_clip_box, &offset_x, &offset_y);
+  }
+
+  // Reset the media box and crop box. When the page has crop box and media box,
+  // the plugin will display the crop box contents and not the entire media box.
+  // If the pages have different crop box values, the plugin will display a
+  // document of multiple page sizes. To give better user experience, we
+  // decided to have same crop box and media box values. Hence, the user will
+  // see a list of uniform pages.
+  FPDFPage_SetMediaBox(page, 0, 0, page_size.width(), page_size.height());
+  FPDFPage_SetCropBox(page, 0, 0, page_size.width(), page_size.height());
+
+  // Transformation is not required, return. Do this check only after updating
+  // the media box and crop box. For more detailed information, please refer to
+  // the comment block right before FPDF_SetMediaBox and FPDF_GetMediaBox calls.
+  if (scale_factor == 1.0 && offset_x == 0 && offset_y == 0)
+    return;
+
+
+  // All the positions have been calculated, now manipulate the PDF.
+  FS_MATRIX matrix = {static_cast<float>(scale_factor),
+                      0,
+                      0,
+                      static_cast<float>(scale_factor),
+                      static_cast<float>(offset_x),
+                      static_cast<float>(offset_y)};
+  FS_RECTF cliprect = {static_cast<float>(source_clip_box.left+offset_x),
+                       static_cast<float>(source_clip_box.top+offset_y),
+                       static_cast<float>(source_clip_box.right+offset_x),
+                       static_cast<float>(source_clip_box.bottom+offset_y)};
+  FPDFPage_TransFormWithClip(page, &matrix, &cliprect);
+  FPDFPage_TransformAnnots(page, scale_factor, 0, 0, scale_factor,
+                           offset_x, offset_y);
+}
+
+void PDFiumEngine::DrawPageShadow(const pp::Rect& page_rc,
+                                  const pp::Rect& shadow_rc,
+                                  const pp::Rect& clip_rc,
+                                  pp::ImageData* image_data) {
+  pp::Rect page_rect(page_rc);
+  page_rect.Offset(page_offset_);
+
+  pp::Rect shadow_rect(shadow_rc);
+  shadow_rect.Offset(page_offset_);
+
+  pp::Rect clip_rect(clip_rc);
+  clip_rect.Offset(page_offset_);
+
+  // Page drop shadow parameters.
+  const double factor = 0.5;
+  const uint32 background = (kBackgroundColorA << 24) |
+                            (kBackgroundColorR << 16) |
+                            (kBackgroundColorG << 8) |
+                            kBackgroundColorB;
+  uint32 depth = std::max(
+      std::max(page_rect.x() - shadow_rect.x(),
+               page_rect.y() - shadow_rect.y()),
+      std::max(shadow_rect.right() - page_rect.right(),
+               shadow_rect.bottom() - page_rect.bottom()));
+  depth = static_cast<uint32>(depth * 1.5) + 1;
+
+  // We need to check depth only to verify our copy of shadow matrix is correct.
+  if (!page_shadow_.get() || page_shadow_->depth() != depth)
+    page_shadow_.reset(new ShadowMatrix(depth, factor, background));
+
+  DCHECK(!image_data->is_null());
+  DrawShadow(image_data, shadow_rect, page_rect, clip_rect, *page_shadow_);
+}
+
+void PDFiumEngine::GetRegion(const pp::Point& location,
+                             pp::ImageData* image_data,
+                             void** region,
+                             int* stride) const {
+  if (image_data->is_null()) {
+    DCHECK(plugin_size_.IsEmpty());
+    *stride = 0;
+    *region = NULL;
+    return;
+  }
+  char* buffer = static_cast<char*>(image_data->data());
+  *stride = image_data->stride();
+
+  pp::Point offset_location = location + page_offset_;
+  // TODO: update this when we support BIDI and scrollbars can be on the left.
+  if (!buffer ||
+      !pp::Rect(page_offset_, plugin_size_).Contains(offset_location)) {
+    *region = NULL;
+    return;
+  }
+
+  buffer += location.y() * (*stride);
+  buffer += (location.x() + page_offset_.x()) * 4;
+  *region = buffer;
+}
+
+void PDFiumEngine::OnSelectionChanged() {
+  if (HasPermission(PDFEngine::PERMISSION_COPY))
+    pp::PDF::SetSelectedText(GetPluginInstance(), GetSelectedText().c_str());
+}
+
+void PDFiumEngine::Form_Invalidate(FPDF_FORMFILLINFO* param,
+                                   FPDF_PAGE page,
+                                   double left,
+                                   double top,
+                                   double right,
+                                   double bottom) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  int page_index = engine->GetVisiblePageIndex(page);
+  if (page_index == -1) {
+    // This can sometime happen when the page is closed because it went off
+    // screen, and PDFium invalidates the control as it's being deleted.
+    return;
+  }
+
+  pp::Rect rect = engine->pages_[page_index]->PageToScreen(
+      engine->GetVisibleRect().point(), engine->current_zoom_, left, top, right,
+      bottom, engine->current_rotation_);
+  engine->client_->Invalidate(rect);
+}
+
+void PDFiumEngine::Form_OutputSelectedRect(FPDF_FORMFILLINFO* param,
+                                           FPDF_PAGE page,
+                                           double left,
+                                           double top,
+                                           double right,
+                                           double bottom) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  int page_index = engine->GetVisiblePageIndex(page);
+  if (page_index == -1) {
+    NOTREACHED();
+    return;
+  }
+  pp::Rect rect = engine->pages_[page_index]->PageToScreen(
+      engine->GetVisibleRect().point(), engine->current_zoom_, left, top, right,
+      bottom, engine->current_rotation_);
+  engine->form_highlights_.push_back(rect);
+}
+
+void PDFiumEngine::Form_SetCursor(FPDF_FORMFILLINFO* param, int cursor_type) {
+  // We don't need this since it's not enough to change the cursor in all
+  // scenarios.  Instead, we check which form field we're under in OnMouseMove.
+}
+
+int PDFiumEngine::Form_SetTimer(FPDF_FORMFILLINFO* param,
+                                int elapse,
+                                TimerCallback timer_func) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->timers_[++engine->next_timer_id_] =
+      std::pair<int, TimerCallback>(elapse, timer_func);
+  engine->client_->ScheduleCallback(engine->next_timer_id_, elapse);
+  return engine->next_timer_id_;
+}
+
+void PDFiumEngine::Form_KillTimer(FPDF_FORMFILLINFO* param, int timer_id) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->timers_.erase(timer_id);
+}
+
+FPDF_SYSTEMTIME PDFiumEngine::Form_GetLocalTime(FPDF_FORMFILLINFO* param) {
+  base::Time time = base::Time::Now();
+  base::Time::Exploded exploded;
+  time.LocalExplode(&exploded);
+
+  FPDF_SYSTEMTIME rv;
+  rv.wYear = exploded.year;
+  rv.wMonth = exploded.month;
+  rv.wDayOfWeek = exploded.day_of_week;
+  rv.wDay = exploded.day_of_month;
+  rv.wHour = exploded.hour;
+  rv.wMinute = exploded.minute;
+  rv.wSecond = exploded.second;
+  rv.wMilliseconds = exploded.millisecond;
+  return rv;
+}
+
+void PDFiumEngine::Form_OnChange(FPDF_FORMFILLINFO* param) {
+  // Don't care about.
+}
+
+FPDF_PAGE PDFiumEngine::Form_GetPage(FPDF_FORMFILLINFO* param,
+                                     FPDF_DOCUMENT document,
+                                     int page_index) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  if (page_index < 0 || page_index >= static_cast<int>(engine->pages_.size()))
+    return NULL;
+  return engine->pages_[page_index]->GetPage();
+}
+
+FPDF_PAGE PDFiumEngine::Form_GetCurrentPage(FPDF_FORMFILLINFO* param,
+                                            FPDF_DOCUMENT document) {
+  // TODO(jam): find out what this is used for.
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  int index = engine->last_page_mouse_down_;
+  if (index == -1) {
+    index = engine->GetMostVisiblePage();
+    if (index == -1) {
+      NOTREACHED();
+      return NULL;
+    }
+  }
+
+  return engine->pages_[index]->GetPage();
+}
+
+int PDFiumEngine::Form_GetRotation(FPDF_FORMFILLINFO* param, FPDF_PAGE page) {
+  return 0;
+}
+
+void PDFiumEngine::Form_ExecuteNamedAction(FPDF_FORMFILLINFO* param,
+                                           FPDF_BYTESTRING named_action) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  std::string action(named_action);
+  if (action == "Print") {
+    engine->client_->Print();
+    return;
+  }
+
+  int index = engine->last_page_mouse_down_;
+  /* Don't try to calculate the most visible page if we don't have a left click
+     before this event (this code originally copied Form_GetCurrentPage which of
+     course needs to do that and which doesn't have recursion). This can end up
+     causing infinite recursion. See http://crbug.com/240413 for more
+     information. Either way, it's not necessary for the spec'd list of named
+     actions.
+  if (index == -1)
+    index = engine->GetMostVisiblePage();
+  */
+  if (index == -1)
+    return;
+
+  // This is the only list of named actions per the spec (see 12.6.4.11). Adobe
+  // Reader supports more, like FitWidth, but since they're not part of the spec
+  // and we haven't got bugs about them, no need to now.
+  if (action == "NextPage") {
+    engine->client_->ScrollToPage(index + 1);
+  } else if (action == "PrevPage") {
+    engine->client_->ScrollToPage(index - 1);
+  } else if (action == "FirstPage") {
+    engine->client_->ScrollToPage(0);
+  } else if (action == "LastPage") {
+    engine->client_->ScrollToPage(engine->pages_.size() - 1);
+  }
+}
+
+void PDFiumEngine::Form_SetTextFieldFocus(FPDF_FORMFILLINFO* param,
+                                          FPDF_WIDESTRING value,
+                                          FPDF_DWORD valueLen,
+                                          FPDF_BOOL is_focus) {
+  // Do nothing for now.
+  // TODO(gene): use this signal to trigger OSK.
+}
+
+void PDFiumEngine::Form_DoURIAction(FPDF_FORMFILLINFO* param,
+                                    FPDF_BYTESTRING uri) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->client_->NavigateTo(std::string(uri), false);
+}
+
+void PDFiumEngine::Form_DoGoToAction(FPDF_FORMFILLINFO* param,
+                                     int page_index,
+                                     int zoom_mode,
+                                     float* position_array,
+                                     int size_of_array) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->client_->ScrollToPage(page_index);
+}
+
+int PDFiumEngine::Form_Alert(IPDF_JSPLATFORM* param,
+                             FPDF_WIDESTRING message,
+                             FPDF_WIDESTRING title,
+                             int type,
+                             int icon) {
+  // See fpdfformfill.h for these values.
+  enum AlertType {
+    ALERT_TYPE_OK = 0,
+    ALERT_TYPE_OK_CANCEL,
+    ALERT_TYPE_YES_ON,
+    ALERT_TYPE_YES_NO_CANCEL
+  };
+
+  enum AlertResult {
+    ALERT_RESULT_OK = 1,
+    ALERT_RESULT_CANCEL,
+    ALERT_RESULT_NO,
+    ALERT_RESULT_YES
+  };
+
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  std::string message_str =
+      base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(message));
+  if (type == ALERT_TYPE_OK) {
+    engine->client_->Alert(message_str);
+    return ALERT_RESULT_OK;
+  }
+
+  bool rv = engine->client_->Confirm(message_str);
+  if (type == ALERT_TYPE_OK_CANCEL)
+    return rv ? ALERT_RESULT_OK : ALERT_RESULT_CANCEL;
+  return rv ? ALERT_RESULT_YES : ALERT_RESULT_NO;
+}
+
+void PDFiumEngine::Form_Beep(IPDF_JSPLATFORM* param, int type) {
+  // Beeps are annoying, and not possible using javascript, so ignore for now.
+}
+
+int PDFiumEngine::Form_Response(IPDF_JSPLATFORM* param,
+                                FPDF_WIDESTRING question,
+                                FPDF_WIDESTRING title,
+                                FPDF_WIDESTRING default_response,
+                                FPDF_WIDESTRING label,
+                                FPDF_BOOL password,
+                                void* response,
+                                int length) {
+  std::string question_str = base::UTF16ToUTF8(
+      reinterpret_cast<const base::char16*>(question));
+  std::string default_str = base::UTF16ToUTF8(
+      reinterpret_cast<const base::char16*>(default_response));
+
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  std::string rv = engine->client_->Prompt(question_str, default_str);
+  base::string16 rv_16 = base::UTF8ToUTF16(rv);
+  int rv_bytes = rv_16.size() * sizeof(base::char16);
+  if (response && rv_bytes <= length)
+    memcpy(response, rv_16.c_str(), rv_bytes);
+  return rv_bytes;
+}
+
+int PDFiumEngine::Form_GetFilePath(IPDF_JSPLATFORM* param,
+                                   void* file_path,
+                                   int length) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  std::string rv = engine->client_->GetURL();
+  if (file_path && rv.size() <= static_cast<size_t>(length))
+    memcpy(file_path, rv.c_str(), rv.size());
+  return rv.size();
+}
+
+void PDFiumEngine::Form_Mail(IPDF_JSPLATFORM* param,
+                             void* mail_data,
+                             int length,
+                             FPDF_BOOL ui,
+                             FPDF_WIDESTRING to,
+                             FPDF_WIDESTRING subject,
+                             FPDF_WIDESTRING cc,
+                             FPDF_WIDESTRING bcc,
+                             FPDF_WIDESTRING message) {
+  DCHECK(length == 0);  // Don't handle attachments; no way with mailto.
+  std::string to_str =
+      base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(to));
+  std::string cc_str =
+      base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(cc));
+  std::string bcc_str =
+      base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(bcc));
+  std::string subject_str =
+      base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(subject));
+  std::string message_str =
+      base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(message));
+
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->client_->Email(to_str, cc_str, bcc_str, subject_str, message_str);
+}
+
+void PDFiumEngine::Form_Print(IPDF_JSPLATFORM* param,
+                              FPDF_BOOL ui,
+                              int start,
+                              int end,
+                              FPDF_BOOL silent,
+                              FPDF_BOOL shrink_to_fit,
+                              FPDF_BOOL print_as_image,
+                              FPDF_BOOL reverse,
+                              FPDF_BOOL annotations) {
+  // No way to pass the extra information to the print dialog using JavaScript.
+  // Just opening it is fine for now.
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->client_->Print();
+}
+
+void PDFiumEngine::Form_SubmitForm(IPDF_JSPLATFORM* param,
+                                   void* form_data,
+                                   int length,
+                                   FPDF_WIDESTRING url) {
+  std::string url_str =
+      base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(url));
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->client_->SubmitForm(url_str, form_data, length);
+}
+
+void PDFiumEngine::Form_GotoPage(IPDF_JSPLATFORM* param,
+                                 int page_number) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  engine->client_->ScrollToPage(page_number);
+}
+
+int PDFiumEngine::Form_Browse(IPDF_JSPLATFORM* param,
+                              void* file_path,
+                              int length) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  std::string path = engine->client_->ShowFileSelectionDialog();
+  if (path.size() + 1 <= static_cast<size_t>(length))
+    memcpy(file_path, &path[0], path.size() + 1);
+  return path.size() + 1;
+}
+
+FPDF_BOOL PDFiumEngine::Pause_NeedToPauseNow(IFSDK_PAUSE* param) {
+  PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
+  return (base::Time::Now() - engine->last_progressive_start_time_).
+      InMilliseconds() > engine->progressive_paint_timeout_;
+}
+
+ScopedUnsupportedFeature::ScopedUnsupportedFeature(PDFiumEngine* engine)
+    : engine_(engine), old_engine_(g_engine_for_unsupported) {
+  g_engine_for_unsupported = engine_;
+}
+
+ScopedUnsupportedFeature::~ScopedUnsupportedFeature() {
+  g_engine_for_unsupported = old_engine_;
+}
+
+PDFEngineExports* PDFEngineExports::Create() {
+  return new PDFiumEngineExports;
+}
+
+namespace {
+
+int CalculatePosition(FPDF_PAGE page,
+                      const PDFiumEngineExports::RenderingSettings& settings,
+                      pp::Rect* dest) {
+  int page_width = static_cast<int>(
+      FPDF_GetPageWidth(page) * settings.dpi_x / kPointsPerInch);
+  int page_height = static_cast<int>(
+      FPDF_GetPageHeight(page) * settings.dpi_y / kPointsPerInch);
+
+  // Start by assuming that we will draw exactly to the bounds rect
+  // specified.
+  *dest = settings.bounds;
+
+  int rotate = 0;  // normal orientation.
+
+  // Auto-rotate landscape pages to print correctly.
+  if (settings.autorotate &&
+      (dest->width() > dest->height()) != (page_width > page_height)) {
+    rotate = 1;  // 90 degrees clockwise.
+    std::swap(page_width, page_height);
+  }
+
+  // See if we need to scale the output
+  bool scale_to_bounds = false;
+  if (settings.fit_to_bounds &&
+      ((page_width > dest->width()) || (page_height > dest->height()))) {
+    scale_to_bounds = true;
+  } else if (settings.stretch_to_bounds &&
+             ((page_width < dest->width()) || (page_height < dest->height()))) {
+    scale_to_bounds = true;
+  }
+
+  if (scale_to_bounds) {
+    // If we need to maintain aspect ratio, calculate the actual width and
+    // height.
+    if (settings.keep_aspect_ratio) {
+      double scale_factor_x = page_width;
+      scale_factor_x /= dest->width();
+      double scale_factor_y = page_height;
+      scale_factor_y /= dest->height();
+      if (scale_factor_x > scale_factor_y) {
+        dest->set_height(page_height / scale_factor_x);
+      } else {
+        dest->set_width(page_width / scale_factor_y);
+      }
+    }
+  } else {
+    // We are not scaling to bounds. Draw in the actual page size. If the
+    // actual page size is larger than the bounds, the output will be
+    // clipped.
+    dest->set_width(page_width);
+    dest->set_height(page_height);
+  }
+
+  if (settings.center_in_bounds) {
+    pp::Point offset((settings.bounds.width() - dest->width()) / 2,
+                     (settings.bounds.height() - dest->height()) / 2);
+    dest->Offset(offset);
+  }
+  return rotate;
+}
+
+}  // namespace
+
+#if defined(OS_WIN)
+bool PDFiumEngineExports::RenderPDFPageToDC(const void* pdf_buffer,
+                                            int buffer_size,
+                                            int page_number,
+                                            const RenderingSettings& settings,
+                                            HDC dc) {
+  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, NULL);
+  if (!doc)
+    return false;
+  FPDF_PAGE page = FPDF_LoadPage(doc, page_number);
+  if (!page) {
+    FPDF_CloseDocument(doc);
+    return false;
+  }
+  RenderingSettings new_settings = settings;
+  // calculate the page size
+  if (new_settings.dpi_x == -1)
+    new_settings.dpi_x = GetDeviceCaps(dc, LOGPIXELSX);
+  if (new_settings.dpi_y == -1)
+    new_settings.dpi_y = GetDeviceCaps(dc, LOGPIXELSY);
+
+  pp::Rect dest;
+  int rotate = CalculatePosition(page, new_settings, &dest);
+
+  int save_state = SaveDC(dc);
+  // The caller wanted all drawing to happen within the bounds specified.
+  // Based on scale calculations, our destination rect might be larger
+  // than the bounds. Set the clip rect to the bounds.
+  IntersectClipRect(dc, settings.bounds.x(), settings.bounds.y(),
+                    settings.bounds.x() + settings.bounds.width(),
+                    settings.bounds.y() + settings.bounds.height());
+
+  // A temporary hack. PDFs generated by Cairo (used by Chrome OS to generate
+  // a PDF output from a webpage) result in very large metafiles and the
+  // rendering using FPDF_RenderPage is incorrect. In this case, render as a
+  // bitmap. Note that this code does not kick in for PDFs printed from Chrome
+  // because in that case we create a temp PDF first before printing and this
+  // temp PDF does not have a creator string that starts with "cairo".
+  base::string16 creator;
+  size_t buffer_bytes = FPDF_GetMetaText(doc, "Creator", NULL, 0);
+  if (buffer_bytes > 1) {
+    FPDF_GetMetaText(doc, "Creator", WriteInto(&creator, buffer_bytes),
+                     buffer_bytes);
+  }
+  bool use_bitmap = false;
+  if (StartsWith(creator, L"cairo", false))
+    use_bitmap = true;
+
+  // Another temporary hack. Some PDFs seems to render very slowly if
+  // FPDF_RenderPage is directly used on a printer DC. I suspect it is
+  // because of the code to talk Postscript directly to the printer if
+  // the printer supports this. Need to discuss this with PDFium. For now,
+  // render to a bitmap and then blit the bitmap to the DC if we have been
+  // supplied a printer DC.
+  int device_type = GetDeviceCaps(dc, TECHNOLOGY);
+  if (use_bitmap ||
+      (device_type == DT_RASPRINTER) || (device_type == DT_PLOTTER)) {
+    FPDF_BITMAP bitmap = FPDFBitmap_Create(dest.width(), dest.height(),
+                                           FPDFBitmap_BGRx);
+      // Clear the bitmap
+    FPDFBitmap_FillRect(bitmap, 0, 0, dest.width(), dest.height(), 255, 255,
+                        255, 255);
+    FPDF_RenderPageBitmap(
+        bitmap, page, 0, 0, dest.width(), dest.height(), rotate,
+        FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
+    int stride = FPDFBitmap_GetStride(bitmap);
+    BITMAPINFO bmi;
+    memset(&bmi, 0, sizeof(bmi));
+    bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+    bmi.bmiHeader.biWidth = dest.width();
+    bmi.bmiHeader.biHeight = -dest.height();  // top-down image
+    bmi.bmiHeader.biPlanes = 1;
+    bmi.bmiHeader.biBitCount = 32;
+    bmi.bmiHeader.biCompression = BI_RGB;
+    bmi.bmiHeader.biSizeImage = stride * dest.height();
+    StretchDIBits(dc, dest.x(), dest.y(), dest.width(), dest.height(),
+                  0, 0, dest.width(), dest.height(),
+                  FPDFBitmap_GetBuffer(bitmap), &bmi, DIB_RGB_COLORS, SRCCOPY);
+    FPDFBitmap_Destroy(bitmap);
+  } else {
+    FPDF_RenderPage(dc, page, dest.x(), dest.y(), dest.width(), dest.height(),
+                    rotate, FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
+  }
+  RestoreDC(dc, save_state);
+  FPDF_ClosePage(page);
+  FPDF_CloseDocument(doc);
+  return true;
+}
+#endif  // OS_WIN
+
+bool PDFiumEngineExports::RenderPDFPageToBitmap(
+    const void* pdf_buffer,
+    int pdf_buffer_size,
+    int page_number,
+    const RenderingSettings& settings,
+    void* bitmap_buffer) {
+  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
+  if (!doc)
+    return false;
+  FPDF_PAGE page = FPDF_LoadPage(doc, page_number);
+  if (!page) {
+    FPDF_CloseDocument(doc);
+    return false;
+  }
+
+  pp::Rect dest;
+  int rotate = CalculatePosition(page, settings, &dest);
+
+  FPDF_BITMAP bitmap =
+      FPDFBitmap_CreateEx(settings.bounds.width(), settings.bounds.height(),
+                          FPDFBitmap_BGRA, bitmap_buffer,
+                          settings.bounds.width() * 4);
+  // Clear the bitmap
+  FPDFBitmap_FillRect(bitmap, 0, 0, settings.bounds.width(),
+                      settings.bounds.height(), 255, 255, 255, 255);
+  // Shift top-left corner of bounds to (0, 0) if it's not there.
+  dest.set_point(dest.point() - settings.bounds.point());
+  FPDF_RenderPageBitmap(
+      bitmap, page, dest.x(), dest.y(), dest.width(), dest.height(), rotate,
+      FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
+  FPDFBitmap_Destroy(bitmap);
+  FPDF_ClosePage(page);
+  FPDF_CloseDocument(doc);
+  return true;
+}
+
+bool PDFiumEngineExports::GetPDFDocInfo(const void* pdf_buffer,
+                                        int buffer_size,
+                                        int* page_count,
+                                        double* max_page_width) {
+  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, NULL);
+  if (!doc)
+    return false;
+  int page_count_local = FPDF_GetPageCount(doc);
+  if (page_count) {
+    *page_count = page_count_local;
+  }
+  if (max_page_width) {
+    *max_page_width = 0;
+    for (int page_number = 0; page_number < page_count_local; page_number++) {
+      double page_width = 0;
+      double page_height = 0;
+      FPDF_GetPageSizeByIndex(doc, page_number, &page_width, &page_height);
+      if (page_width > *max_page_width) {
+        *max_page_width = page_width;
+      }
+    }
+  }
+  FPDF_CloseDocument(doc);
+  return true;
+}
+
+}  // namespace chrome_pdf