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chromium / chromium / src / 58b1e50ab47d91f374b75afa2ddd01b7a936295a / . / pdf / pdfium / pdfium_engine.cc
blob: fa13753e50943757c08e3f872a900a4aa78479a7 [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "pdf/pdfium/pdfium_engine.h"
#include <math.h>
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <limits>
#include <memory>
#include <set>
#include <utility>
#include "base/auto_reset.h"
#include "base/i18n/encoding_detection.h"
#include "base/i18n/icu_string_conversions.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "build/build_config.h"
#include "gin/array_buffer.h"
#include "gin/public/gin_embedders.h"
#include "gin/public/isolate_holder.h"
#include "pdf/document_loader_impl.h"
#include "pdf/draw_utils.h"
#include "pdf/pdf_transform.h"
#include "pdf/pdfium/pdfium_api_string_buffer_adapter.h"
#include "pdf/pdfium/pdfium_document.h"
#include "pdf/pdfium/pdfium_mem_buffer_file_read.h"
#include "pdf/pdfium/pdfium_mem_buffer_file_write.h"
#include "pdf/pdfium/pdfium_unsupported_features.h"
#include "pdf/url_loader_wrapper_impl.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/private/pdf.h"
#include "ppapi/cpp/trusted/browser_font_trusted.h"
#include "ppapi/cpp/var_dictionary.h"
#include "printing/units.h"
#include "third_party/pdfium/public/cpp/fpdf_scopers.h"
#include "third_party/pdfium/public/fpdf_annot.h"
#include "third_party/pdfium/public/fpdf_attachment.h"
#include "third_party/pdfium/public/fpdf_catalog.h"
#include "third_party/pdfium/public/fpdf_ext.h"
#include "third_party/pdfium/public/fpdf_ppo.h"
#include "third_party/pdfium/public/fpdf_searchex.h"
#include "third_party/pdfium/public/fpdf_sysfontinfo.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/geometry/rect.h"
#include "v8/include/v8.h"
using printing::ConvertUnit;
using printing::ConvertUnitDouble;
using printing::kPointsPerInch;
using printing::kPixelsPerInch;
namespace chrome_pdf {
static_assert(static_cast<int>(PDFEngine::FormType::kNone) == FORMTYPE_NONE,
"None form types must match");
static_assert(static_cast<int>(PDFEngine::FormType::kAcroForm) ==
FORMTYPE_ACRO_FORM,
"AcroForm form types must match");
static_assert(static_cast<int>(PDFEngine::FormType::kXFAFull) ==
FORMTYPE_XFA_FULL,
"XFA full form types must match");
static_assert(static_cast<int>(PDFEngine::FormType::kXFAForeground) ==
FORMTYPE_XFA_FOREGROUND,
"XFA foreground form types must match");
static_assert(static_cast<int>(PDFEngine::FormType::kCount) == FORMTYPE_COUNT,
"Form type counts must match");
namespace {
constexpr int32_t kPageShadowTop = 3;
constexpr int32_t kPageShadowBottom = 7;
constexpr int32_t kPageShadowLeft = 5;
constexpr int32_t kPageShadowRight = 5;
constexpr int32_t kPageSeparatorThickness = 4;
constexpr int32_t kHighlightColorR = 153;
constexpr int32_t kHighlightColorG = 193;
constexpr int32_t kHighlightColorB = 218;
constexpr uint32_t kPendingPageColor = 0xFFEEEEEE;
constexpr uint32_t kFormHighlightColor = 0xFFE4DD;
constexpr int32_t kFormHighlightAlpha = 100;
constexpr int kMaxPasswordTries = 3;
constexpr base::TimeDelta kTouchLongPressTimeout =
base::TimeDelta::FromMilliseconds(300);
// Windows has native panning capabilities. No need to use our own.
#if defined(OS_WIN)
constexpr bool kViewerImplementedPanning = false;
#else
constexpr bool kViewerImplementedPanning = true;
#endif
// See Table 3.20 in
// http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
constexpr uint32_t kPDFPermissionPrintLowQualityMask = 1 << 2;
constexpr uint32_t kPDFPermissionPrintHighQualityMask = 1 << 11;
constexpr uint32_t kPDFPermissionCopyMask = 1 << 4;
constexpr uint32_t kPDFPermissionCopyAccessibleMask = 1 << 9;
constexpr int32_t kLoadingTextVerticalOffset = 50;
// The maximum amount of time we'll spend doing a paint before we give back
// control of the thread.
constexpr base::TimeDelta kMaxProgressivePaintTime =
base::TimeDelta::FromMilliseconds(300);
// 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. This
// is set to 250 ms to give enough time for most PDFs to render, while avoiding
// adding too much latency to the display of the final image when the user
// stops scrolling.
// Setting a higher value has minimal benefit (scrolling at less than 4 fps will
// never be a great experience) and there is some cost, since when the user
// stops scrolling the in-progress painting has to complete or timeout before
// the final painting can start.
// The scrollbar will always be responsive since it is managed by a separate
// process.
constexpr base::TimeDelta kMaxInitialProgressivePaintTime =
base::TimeDelta::FromMilliseconds(250);
PDFiumEngine* g_engine_for_fontmapper = nullptr;
#if defined(OS_LINUX)
PP_Instance g_last_instance_id;
// TODO(npm): Move font stuff to another file to reduce the size of this one
PP_BrowserFont_Trusted_Weight WeightToBrowserFontTrustedWeight(int weight) {
static_assert(PP_BROWSERFONT_TRUSTED_WEIGHT_100 == 0,
"PP_BrowserFont_Trusted_Weight min");
static_assert(PP_BROWSERFONT_TRUSTED_WEIGHT_900 == 8,
"PP_BrowserFont_Trusted_Weight max");
constexpr int kMinimumWeight = 100;
constexpr int kMaximumWeight = 900;
int normalized_weight =
std::min(std::max(weight, kMinimumWeight), kMaximumWeight);
normalized_weight = (normalized_weight / 100) - 1;
return static_cast<PP_BrowserFont_Trusted_Weight>(normalized_weight);
}
// 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(FPDF_SYSFONTINFO* sysfontinfo, void* mapper) {
FPDF_AddInstalledFont(mapper, "Arial", FXFONT_DEFAULT_CHARSET);
const FPDF_CharsetFontMap* font_map = FPDF_GetDefaultTTFMap();
for (; font_map->charset != -1; ++font_map) {
FPDF_AddInstalledFont(mapper, font_map->fontname, font_map->charset);
}
}
void* MapFont(FPDF_SYSFONTINFO*,
int weight,
int italic,
int charset,
int pitch_family,
const char* face,
int* exact) {
// Do not attempt to map fonts if pepper is not initialized (for privet local
// printing).
// TODO(noamsml): Real font substitution (http://crbug.com/391978)
if (!pp::Module::Get())
return nullptr;
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 nullptr;
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);
}
static const struct {
const char* pdf_name;
const char* face;
bool bold;
bool italic;
} kPdfFontSubstitutions[] = {
{"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},
};
// Similar logic exists in PDFium's CFX_FolderFontInfo::FindFont().
if (charset == FXFONT_ANSI_CHARSET && (pitch_family & FXFONT_FF_FIXEDPITCH))
face = "Courier New";
// Map from the standard PDF fonts to TrueType font names.
size_t i;
for (i = 0; i < base::size(kPdfFontSubstitutions); ++i) {
if (strcmp(face, kPdfFontSubstitutions[i].pdf_name) == 0) {
description.set_face(kPdfFontSubstitutions[i].face);
if (kPdfFontSubstitutions[i].bold)
description.set_weight(PP_BROWSERFONT_TRUSTED_WEIGHT_BOLD);
if (kPdfFontSubstitutions[i].italic)
description.set_italic(true);
break;
}
}
if (i == base::size(kPdfFontSubstitutions)) {
// Convert to UTF-8 before calling set_face().
std::string face_utf8;
if (base::IsStringUTF8(face)) {
face_utf8 = face;
} else {
std::string encoding;
if (base::DetectEncoding(face, &encoding)) {
// ConvertToUtf8AndNormalize() clears |face_utf8| on failure.
base::ConvertToUtf8AndNormalize(face, encoding, &face_utf8);
}
}
if (face_utf8.empty())
return nullptr;
description.set_face(face_utf8);
description.set_weight(WeightToBrowserFontTrustedWeight(weight));
description.set_italic(italic > 0);
}
if (!pp::PDF::IsAvailable()) {
NOTREACHED();
return nullptr;
}
if (g_engine_for_fontmapper)
g_engine_for_fontmapper->FontSubstituted();
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(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(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};
#else
struct FPDF_SYSFONTINFO_WITHMETRICS : public FPDF_SYSFONTINFO {
explicit FPDF_SYSFONTINFO_WITHMETRICS(FPDF_SYSFONTINFO* sysfontinfo) {
version = sysfontinfo->version;
default_sysfontinfo = sysfontinfo;
}
~FPDF_SYSFONTINFO_WITHMETRICS() {
FPDF_FreeDefaultSystemFontInfo(default_sysfontinfo);
}
FPDF_SYSFONTINFO* default_sysfontinfo;
};
FPDF_SYSFONTINFO_WITHMETRICS* g_font_info = nullptr;
void* MapFontWithMetrics(FPDF_SYSFONTINFO* sysfontinfo,
int weight,
int italic,
int charset,
int pitch_family,
const char* face,
int* exact) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->MapFont)
return nullptr;
void* mapped_font = fontinfo_with_metrics->default_sysfontinfo->MapFont(
fontinfo_with_metrics->default_sysfontinfo, weight, italic, charset,
pitch_family, face, exact);
if (mapped_font && g_engine_for_fontmapper)
g_engine_for_fontmapper->FontSubstituted();
return mapped_font;
}
void DeleteFont(FPDF_SYSFONTINFO* sysfontinfo, void* font_id) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->DeleteFont)
return;
fontinfo_with_metrics->default_sysfontinfo->DeleteFont(
fontinfo_with_metrics->default_sysfontinfo, font_id);
}
void EnumFonts(FPDF_SYSFONTINFO* sysfontinfo, void* mapper) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->EnumFonts)
return;
fontinfo_with_metrics->default_sysfontinfo->EnumFonts(
fontinfo_with_metrics->default_sysfontinfo, mapper);
}
unsigned long GetFaceName(FPDF_SYSFONTINFO* sysfontinfo,
void* hFont,
char* buffer,
unsigned long buffer_size) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->GetFaceName)
return 0;
return fontinfo_with_metrics->default_sysfontinfo->GetFaceName(
fontinfo_with_metrics->default_sysfontinfo, hFont, buffer, buffer_size);
}
void* GetFont(FPDF_SYSFONTINFO* sysfontinfo, const char* face) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->GetFont)
return nullptr;
return fontinfo_with_metrics->default_sysfontinfo->GetFont(
fontinfo_with_metrics->default_sysfontinfo, face);
}
int GetFontCharset(FPDF_SYSFONTINFO* sysfontinfo, void* hFont) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->GetFontCharset)
return 0;
return fontinfo_with_metrics->default_sysfontinfo->GetFontCharset(
fontinfo_with_metrics->default_sysfontinfo, hFont);
}
unsigned long GetFontData(FPDF_SYSFONTINFO* sysfontinfo,
void* hFont,
unsigned int table,
unsigned char* buffer,
unsigned long buf_size) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->GetFontData)
return 0;
return fontinfo_with_metrics->default_sysfontinfo->GetFontData(
fontinfo_with_metrics->default_sysfontinfo, hFont, table, buffer,
buf_size);
}
void Release(FPDF_SYSFONTINFO* sysfontinfo) {
auto* fontinfo_with_metrics =
static_cast<FPDF_SYSFONTINFO_WITHMETRICS*>(sysfontinfo);
if (!fontinfo_with_metrics->default_sysfontinfo->Release)
return;
fontinfo_with_metrics->default_sysfontinfo->Release(
fontinfo_with_metrics->default_sysfontinfo);
}
#endif // defined(OS_LINUX)
PDFiumEngine::CreateDocumentLoaderFunction
g_create_document_loader_for_testing = nullptr;
template <class S>
bool IsAboveOrDirectlyLeftOf(const S& lhs, const S& rhs) {
return lhs.y() < rhs.y() || (lhs.y() == rhs.y() && lhs.x() < rhs.x());
}
int CalculateCenterForZoom(int center, int length, double zoom) {
int adjusted_center =
static_cast<int>(center * zoom) - static_cast<int>(length * zoom / 2);
return std::max(adjusted_center, 0);
}
// This formats a string with special 0xfffe end-of-line hyphens the same way
// as Adobe Reader. When a hyphen is encountered, the next non-CR/LF whitespace
// becomes CR+LF and the hyphen is erased. If there is no whitespace between
// two hyphens, the latter hyphen is erased and ignored.
void FormatStringWithHyphens(base::string16* text) {
// First pass marks all the hyphen positions.
struct HyphenPosition {
HyphenPosition() : position(0), next_whitespace_position(0) {}
size_t position;
size_t next_whitespace_position; // 0 for none
};
std::vector<HyphenPosition> hyphen_positions;
HyphenPosition current_hyphen_position;
bool current_hyphen_position_is_valid = false;
constexpr base::char16 kPdfiumHyphenEOL = 0xfffe;
for (size_t i = 0; i < text->size(); ++i) {
const base::char16& current_char = (*text)[i];
if (current_char == kPdfiumHyphenEOL) {
if (current_hyphen_position_is_valid)
hyphen_positions.push_back(current_hyphen_position);
current_hyphen_position = HyphenPosition();
current_hyphen_position.position = i;
current_hyphen_position_is_valid = true;
} else if (base::IsUnicodeWhitespace(current_char)) {
if (current_hyphen_position_is_valid) {
if (current_char != L'\r' && current_char != L'\n')
current_hyphen_position.next_whitespace_position = i;
hyphen_positions.push_back(current_hyphen_position);
current_hyphen_position_is_valid = false;
}
}
}
if (current_hyphen_position_is_valid)
hyphen_positions.push_back(current_hyphen_position);
// With all the hyphen positions, do the search and replace.
while (!hyphen_positions.empty()) {
static constexpr base::char16 kCr[] = {L'\r', L'\0'};
const HyphenPosition& position = hyphen_positions.back();
if (position.next_whitespace_position != 0) {
(*text)[position.next_whitespace_position] = L'\n';
text->insert(position.next_whitespace_position, kCr);
}
text->erase(position.position, 1);
hyphen_positions.pop_back();
}
// Adobe Reader also get rid of trailing spaces right before a CRLF.
static constexpr base::char16 kSpaceCrCn[] = {L' ', L'\r', L'\n', L'\0'};
static constexpr base::char16 kCrCn[] = {L'\r', L'\n', L'\0'};
base::ReplaceSubstringsAfterOffset(text, 0, kSpaceCrCn, kCrCn);
}
// Replace CR/LF with just LF on POSIX.
void FormatStringForOS(base::string16* text) {
#if defined(OS_POSIX)
static constexpr base::char16 kCr[] = {L'\r', L'\0'};
static constexpr base::char16 kBlank[] = {L'\0'};
base::ReplaceChars(*text, kCr, kBlank, text);
#elif defined(OS_WIN)
// Do nothing
#else
NOTIMPLEMENTED();
#endif
}
// Returns true if |cur| is a character to break on.
// For double clicks, look for work breaks.
// For triple clicks, look for line breaks.
// The actual algorithm used in Blink is much more complicated, so do a simple
// approximation.
bool FindMultipleClickBoundary(bool is_double_click, base::char16 cur) {
if (!is_double_click)
return cur == '\n';
// Deal with ASCII characters.
if (base::IsAsciiAlpha(cur) || base::IsAsciiDigit(cur) || cur == '_')
return false;
if (cur < 128)
return true;
if (cur == kZeroWidthSpace)
return true;
return false;
}
std::string GetDocumentMetadata(FPDF_DOCUMENT doc, const std::string& key) {
size_t size = FPDF_GetMetaText(doc, key.c_str(), nullptr, 0);
if (size == 0)
return std::string();
base::string16 value;
PDFiumAPIStringBufferSizeInBytesAdapter<base::string16> string_adapter(
&value, size, false);
string_adapter.Close(
FPDF_GetMetaText(doc, key.c_str(), string_adapter.GetData(), size));
return base::UTF16ToUTF8(value);
}
gin::IsolateHolder* g_isolate_holder = nullptr;
void SetUpV8() {
gin::IsolateHolder::Initialize(gin::IsolateHolder::kNonStrictMode,
gin::IsolateHolder::kStableV8Extras,
gin::ArrayBufferAllocator::SharedInstance());
DCHECK(!g_isolate_holder);
g_isolate_holder = new gin::IsolateHolder(
base::ThreadTaskRunnerHandle::Get(), gin::IsolateHolder::kSingleThread,
gin::IsolateHolder::IsolateType::kUtility);
g_isolate_holder->isolate()->Enter();
}
void TearDownV8() {
g_isolate_holder->isolate()->Exit();
delete g_isolate_holder;
g_isolate_holder = nullptr;
}
// Returns true if the given |area| and |form_type| combination from
// PDFiumEngine::GetCharIndex() indicates it is a form text area.
bool IsFormTextArea(PDFiumPage::Area area, int form_type) {
if (form_type == FPDF_FORMFIELD_UNKNOWN)
return false;
DCHECK_EQ(area, PDFiumPage::FormTypeToArea(form_type));
return area == PDFiumPage::FORM_TEXT_AREA;
}
// Checks whether or not focus is in an editable form text area given the
// form field annotation flags and form type.
bool CheckIfEditableFormTextArea(int flags, int form_type) {
if (!!(flags & FPDF_FORMFLAG_READONLY))
return false;
if (form_type == FPDF_FORMFIELD_TEXTFIELD)
return true;
if (form_type == FPDF_FORMFIELD_COMBOBOX &&
(!!(flags & FPDF_FORMFLAG_CHOICE_EDIT))) {
return true;
}
return false;
}
bool IsLinkArea(PDFiumPage::Area area) {
return area == PDFiumPage::WEBLINK_AREA || area == PDFiumPage::DOCLINK_AREA;
}
// Normalize a MouseInputEvent. For Mac, this means transforming ctrl + left
// button down events into a right button down events.
pp::MouseInputEvent NormalizeMouseEvent(pp::Instance* instance,
const pp::MouseInputEvent& event) {
pp::MouseInputEvent normalized_event = event;
#if defined(OS_MACOSX)
uint32_t modifiers = event.GetModifiers();
if ((modifiers & PP_INPUTEVENT_MODIFIER_CONTROLKEY) &&
event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT &&
event.GetType() == PP_INPUTEVENT_TYPE_MOUSEDOWN) {
uint32_t new_modifiers = modifiers & ~PP_INPUTEVENT_MODIFIER_CONTROLKEY;
normalized_event = pp::MouseInputEvent(
instance, PP_INPUTEVENT_TYPE_MOUSEDOWN, event.GetTimeStamp(),
new_modifiers, PP_INPUTEVENT_MOUSEBUTTON_RIGHT, event.GetPosition(), 1,
event.GetMovement());
}
#endif
return normalized_event;
}
// These values are intended for the JS to handle, and it doesn't have access
// to the PDFDEST_VIEW_* defines.
std::string ConvertViewIntToViewString(unsigned long view_int) {
switch (view_int) {
case PDFDEST_VIEW_XYZ:
return "XYZ";
case PDFDEST_VIEW_FIT:
return "Fit";
case PDFDEST_VIEW_FITH:
return "FitH";
case PDFDEST_VIEW_FITV:
return "FitV";
case PDFDEST_VIEW_FITR:
return "FitR";
case PDFDEST_VIEW_FITB:
return "FitB";
case PDFDEST_VIEW_FITBH:
return "FitBH";
case PDFDEST_VIEW_FITBV:
return "FitBV";
case PDFDEST_VIEW_UNKNOWN_MODE:
return "";
default:
NOTREACHED();
return "";
}
}
// Simplify to \" for searching
constexpr wchar_t kHebrewPunctuationGershayimCharacter = 0x05F4;
constexpr wchar_t kLeftDoubleQuotationMarkCharacter = 0x201C;
constexpr wchar_t kRightDoubleQuotationMarkCharacter = 0x201D;
// Simplify \' for searching
constexpr wchar_t kHebrewPunctuationGereshCharacter = 0x05F3;
constexpr wchar_t kLeftSingleQuotationMarkCharacter = 0x2018;
constexpr wchar_t kRightSingleQuotationMarkCharacter = 0x2019;
wchar_t SimplifyForSearch(wchar_t c) {
switch (c) {
case kHebrewPunctuationGershayimCharacter:
case kLeftDoubleQuotationMarkCharacter:
case kRightDoubleQuotationMarkCharacter:
return L'\"';
case kHebrewPunctuationGereshCharacter:
case kLeftSingleQuotationMarkCharacter:
case kRightSingleQuotationMarkCharacter:;
return L'\'';
default:
return c;
}
}
} // namespace
bool InitializeSDK() {
SetUpV8();
FPDF_LIBRARY_CONFIG config;
config.version = 2;
config.m_pUserFontPaths = nullptr;
config.m_pIsolate = v8::Isolate::GetCurrent();
config.m_v8EmbedderSlot = gin::kEmbedderPDFium;
FPDF_InitLibraryWithConfig(&config);
#if defined(OS_LINUX)
// Font loading doesn't work in the renderer sandbox in Linux.
FPDF_SetSystemFontInfo(&g_font_info);
#else
g_font_info =
new FPDF_SYSFONTINFO_WITHMETRICS(FPDF_GetDefaultSystemFontInfo());
g_font_info->Release = Release;
g_font_info->EnumFonts = EnumFonts;
// Set new MapFont that calculates metrics
g_font_info->MapFont = MapFontWithMetrics;
g_font_info->GetFont = GetFont;
g_font_info->GetFaceName = GetFaceName;
g_font_info->GetFontCharset = GetFontCharset;
g_font_info->GetFontData = GetFontData;
g_font_info->DeleteFont = DeleteFont;
FPDF_SetSystemFontInfo(g_font_info);
#endif
InitializeUnsupportedFeaturesHandler();
return true;
}
void ShutdownSDK() {
FPDF_DestroyLibrary();
#if !defined(OS_LINUX)
delete g_font_info;
#endif
TearDownV8();
}
std::unique_ptr<PDFEngine> PDFEngine::Create(PDFEngine::Client* client,
bool enable_javascript) {
return std::make_unique<PDFiumEngine>(client, enable_javascript);
}
PDFiumEngine::PDFiumEngine(PDFEngine::Client* client, bool enable_javascript)
: client_(client),
form_filler_(this, enable_javascript),
mouse_down_state_(PDFiumPage::NONSELECTABLE_AREA,
PDFiumPage::LinkTarget()),
print_(this) {
find_factory_.Initialize(this);
password_factory_.Initialize(this);
IFSDK_PAUSE::version = 1;
IFSDK_PAUSE::user = nullptr;
IFSDK_PAUSE::NeedToPauseNow = Pause_NeedToPauseNow;
#if defined(OS_LINUX)
// PreviewModeClient does not know its pp::Instance.
pp::Instance* instance = client_->GetPluginInstance();
if (instance)
g_last_instance_id = instance->pp_instance();
#endif
}
PDFiumEngine::~PDFiumEngine() {
for (auto& page : pages_)
page->Unload();
if (doc())
FORM_DoDocumentAAction(form(), FPDFDOC_AACTION_WC);
}
// static
void PDFiumEngine::SetCreateDocumentLoaderFunctionForTesting(
CreateDocumentLoaderFunction function) {
g_create_document_loader_for_testing = function;
}
bool PDFiumEngine::New(const char* url, const char* headers) {
url_ = url;
if (headers)
headers_ = headers;
else
headers_.clear();
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_->DidScroll(pp::Point(old_x - position, 0));
OnSelectionPositionChanged();
}
void PDFiumEngine::ScrolledToYPosition(int position) {
CancelPaints();
int old_y = position_.y();
position_.set_y(position);
CalculateVisiblePages();
client_->DidScroll(pp::Point(0, old_y - position));
OnSelectionPositionChanged();
}
void PDFiumEngine::PrePaint() {
for (auto& paint : progressive_paints_)
paint.set_painted(false);
}
void PDFiumEngine::Paint(const pp::Rect& rect,
pp::ImageData* image_data,
std::vector<pp::Rect>* ready,
std::vector<pp::Rect>* pending) {
DCHECK(image_data);
DCHECK(ready);
DCHECK(pending);
pp::Rect leftover = rect;
for (size_t i = 0; i < visible_pages_.size(); ++i) {
int index = visible_pages_[i];
// 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;
// Compute the leftover dirty region. The first page may have blank space
// above it, in which case we also need to subtract that space from the
// dirty region.
if (i == 0) {
pp::Rect blank_space_in_screen = dirty_in_screen;
blank_space_in_screen.set_y(0);
blank_space_in_screen.set_height(dirty_in_screen.y());
leftover = leftover.Subtract(blank_space_in_screen);
}
leftover = leftover.Subtract(dirty_in_screen);
if (pages_[index]->available()) {
int progressive = GetProgressiveIndex(index);
if (progressive != -1) {
DCHECK_GE(progressive, 0);
DCHECK_LT(static_cast<size_t>(progressive), progressive_paints_.size());
if (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_ = kMaxInitialProgressivePaintTime;
} else {
progressive_paint_timeout_ = kMaxProgressivePaintTime;
}
progressive_paints_[progressive].set_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());
progressive_paints_.erase(progressive_paints_.begin() + i);
--i;
}
}
bool PDFiumEngine::HandleDocumentLoad(const pp::URLLoader& loader) {
password_tries_remaining_ = kMaxPasswordTries;
process_when_pending_request_complete_ = true;
if (g_create_document_loader_for_testing) {
doc_loader_ = g_create_document_loader_for_testing(this);
} else {
auto loader_wrapper =
std::make_unique<URLLoaderWrapperImpl>(GetPluginInstance(), loader);
loader_wrapper->SetResponseHeaders(headers_);
doc_loader_ = std::make_unique<DocumentLoaderImpl>(this);
if (!doc_loader_->Init(std::move(loader_wrapper), url_))
return false;
}
document_ = std::make_unique<PDFiumDocument>(doc_loader_.get());
// request initial data.
doc_loader_->RequestData(0, 1);
return true;
}
pp::Instance* PDFiumEngine::GetPluginInstance() {
return client_->GetPluginInstance();
}
std::unique_ptr<URLLoaderWrapper> PDFiumEngine::CreateURLLoader() {
return std::make_unique<URLLoaderWrapperImpl>(GetPluginInstance(),
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));
}
std::string PDFiumEngine::GetMetadata(const std::string& key) {
return GetDocumentMetadata(doc(), key);
}
std::vector<uint8_t> PDFiumEngine::GetSaveData() {
PDFiumMemBufferFileWrite output_file_write;
if (!FPDF_SaveAsCopy(doc(), &output_file_write, 0))
return std::vector<uint8_t>();
return output_file_write.TakeBuffer();
}
void PDFiumEngine::OnPendingRequestComplete() {
if (!process_when_pending_request_complete_)
return;
if (!fpdf_availability()) {
document_->file_access().m_FileLen = doc_loader_->GetDocumentSize();
document_->CreateFPDFAvailability();
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()) != PDF_LINEARIZED) {
// Wait complete document.
process_when_pending_request_complete_ = false;
document_->ResetFPDFAvailability();
return;
}
}
if (!doc()) {
LoadDocument();
return;
}
if (pages_.empty()) {
LoadBody();
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 (int pending_page : pending_pages_) {
if (CheckPageAvailable(pending_page, &still_pending)) {
update_pages = true;
if (IsPageVisible(pending_page)) {
client_->NotifyPageBecameVisible(
pages_[pending_page]->GetPageFeatures());
client_->Invalidate(GetPageScreenRect(pending_page));
}
}
}
pending_pages_.swap(still_pending);
if (update_pages)
LoadPageInfo(true);
}
void PDFiumEngine::OnNewDataReceived() {
client_->DocumentLoadProgress(doc_loader_->BytesReceived(),
doc_loader_->GetDocumentSize());
}
void PDFiumEngine::OnDocumentComplete() {
if (doc())
return FinishLoadingDocument();
document_->file_access().m_FileLen = doc_loader_->GetDocumentSize();
if (!fpdf_availability()) {
document_->CreateFPDFAvailability();
DCHECK(fpdf_availability());
}
LoadDocument();
}
void PDFiumEngine::OnDocumentCanceled() {
if (visible_pages_.empty())
client_->DocumentLoadFailed();
else
OnDocumentComplete();
}
void PDFiumEngine::CancelBrowserDownload() {
client_->CancelBrowserDownload();
}
void PDFiumEngine::FinishLoadingDocument() {
DCHECK(doc());
DCHECK(doc_loader_->IsDocumentComplete());
LoadBody();
FX_DOWNLOADHINTS& download_hints = document_->download_hints();
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);
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()) {
DocumentFeatures document_features;
document_features.page_count = pages_.size();
document_features.has_attachments = (FPDFDoc_GetAttachmentCount(doc()) > 0);
document_features.is_linearized =
(FPDFAvail_IsLinearized(fpdf_availability()) == PDF_LINEARIZED);
document_features.is_tagged = FPDFCatalog_IsTagged(doc());
document_features.form_type =
static_cast<FormType>(FPDF_GetFormType(doc()));
client_->DocumentLoadComplete(document_features,
doc_loader_->BytesReceived());
}
}
void PDFiumEngine::UnsupportedFeature(const std::string& feature) {
client_->DocumentHasUnsupportedFeature(feature);
}
void PDFiumEngine::FontSubstituted() {
client_->FontSubstituted();
}
FPDF_AVAIL PDFiumEngine::fpdf_availability() const {
return document_ ? document_->fpdf_availability() : nullptr;
}
FPDF_DOCUMENT PDFiumEngine::doc() const {
return document_ ? document_->doc() : nullptr;
}
FPDF_FORMHANDLE PDFiumEngine::form() const {
return document_ ? document_->form() : nullptr;
}
void PDFiumEngine::ContinueFind(int32_t result) {
StartFind(current_find_text_, result != 0);
}
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_MOUSEENTER:
OnMouseEnter(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;
case PP_INPUTEVENT_TYPE_TOUCHSTART: {
KillTouchTimer();
pp::TouchInputEvent touch_event(event);
if (touch_event.GetTouchCount(PP_TOUCHLIST_TYPE_TARGETTOUCHES) == 1)
ScheduleTouchTimer(touch_event);
break;
}
case PP_INPUTEVENT_TYPE_TOUCHEND:
KillTouchTimer();
break;
case PP_INPUTEVENT_TYPE_TOUCHMOVE:
// TODO(dsinclair): This should allow a little bit of movement (up to the
// touch radii) to account for finger jiggle.
KillTouchTimer();
break;
default:
break;
}
DCHECK(defer_page_unload_);
defer_page_unload_ = false;
// Store the pages to unload away because the act of unloading pages can cause
// there to be more pages to unload. We leave those extra pages to be unloaded
// on the next go around.
std::vector<int> pages_to_unload;
std::swap(pages_to_unload, deferred_page_unloads_);
for (int page_index : pages_to_unload)
pages_[page_index]->Unload();
return rv;
}
uint32_t PDFiumEngine::QuerySupportedPrintOutputFormats() {
if (HasPermission(PERMISSION_PRINT_HIGH_QUALITY))
return PP_PRINTOUTPUTFORMAT_PDF | PP_PRINTOUTPUTFORMAT_RASTER;
if (HasPermission(PERMISSION_PRINT_LOW_QUALITY))
return PP_PRINTOUTPUTFORMAT_RASTER;
return 0;
}
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,
const PP_PdfPrintSettings_Dev& pdf_print_settings) {
ScopedSubstFont scoped_subst_font(this);
if (!page_range_count)
return pp::Resource();
if ((print_settings.format & PP_PRINTOUTPUTFORMAT_PDF) &&
HasPermission(PERMISSION_PRINT_HIGH_QUALITY)) {
return PrintPagesAsPdf(page_ranges, page_range_count, print_settings,
pdf_print_settings);
}
if (HasPermission(PERMISSION_PRINT_LOW_QUALITY)) {
return PrintPagesAsRasterPdf(page_ranges, page_range_count, print_settings,
pdf_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,
const PP_PdfPrintSettings_Dev& pdf_print_settings) {
DCHECK(page_range_count);
// If document is not downloaded yet, disable printing.
if (doc() && !doc_loader_->IsDocumentComplete())
return pp::Buffer_Dev();
KillFormFocus();
#if defined(OS_LINUX)
g_last_instance_id = client_->GetPluginInstance()->pp_instance();
#endif
return ConvertPdfToBufferDev(
print_.PrintPagesAsPdf(page_ranges, page_range_count, print_settings,
pdf_print_settings, /*raster=*/true));
}
pp::Buffer_Dev PDFiumEngine::PrintPagesAsPdf(
const PP_PrintPageNumberRange_Dev* page_ranges,
uint32_t page_range_count,
const PP_PrintSettings_Dev& print_settings,
const PP_PdfPrintSettings_Dev& pdf_print_settings) {
DCHECK(page_range_count);
DCHECK(doc());
KillFormFocus();
std::vector<uint32_t> page_numbers =
PDFiumPrint::GetPageNumbersFromPrintPageNumberRange(page_ranges,
page_range_count);
for (uint32_t page_number : page_numbers) {
pages_[page_number]->GetPage();
if (!IsPageVisible(page_number))
pages_[page_number]->Unload();
}
return ConvertPdfToBufferDev(
print_.PrintPagesAsPdf(page_ranges, page_range_count, print_settings,
pdf_print_settings, /*raster=*/false));
}
pp::Buffer_Dev PDFiumEngine::ConvertPdfToBufferDev(
const std::vector<uint8_t>& pdf_data) {
pp::Buffer_Dev buffer;
if (!pdf_data.empty()) {
buffer = pp::Buffer_Dev(GetPluginInstance(), pdf_data.size());
if (!buffer.is_null())
memcpy(buffer.data(), pdf_data.data(), pdf_data.size());
}
return buffer;
}
void PDFiumEngine::KillFormFocus() {
FORM_ForceToKillFocus(form());
SetInFormTextArea(false);
}
void PDFiumEngine::SetFormSelectedText(FPDF_FORMHANDLE form_handle,
FPDF_PAGE page) {
unsigned long form_sel_text_len =
FORM_GetSelectedText(form_handle, page, nullptr, 0);
// If form selected text is empty and there was no previous form text
// selection, exit early because nothing has changed. When |form_sel_text_len|
// is 2, that represents a wide string with just a NUL-terminator.
if (form_sel_text_len <= 2 && selected_form_text_.empty())
return;
base::string16 selected_form_text16;
PDFiumAPIStringBufferSizeInBytesAdapter<base::string16> string_adapter(
&selected_form_text16, form_sel_text_len, false);
string_adapter.Close(FORM_GetSelectedText(
form_handle, page, string_adapter.GetData(), form_sel_text_len));
// Update previous and current selections, then compare them to check if
// selection has changed. If so, set plugin text selection.
std::string selected_form_text = selected_form_text_;
selected_form_text_ = base::UTF16ToUTF8(selected_form_text16);
if (selected_form_text != selected_form_text_) {
DCHECK(in_form_text_area_);
pp::PDF::SetSelectedText(GetPluginInstance(), selected_form_text_.c_str());
}
}
void PDFiumEngine::PrintEnd() {
FORM_DoDocumentAAction(form(), FPDFDOC_AACTION_DP);
}
PDFiumPage::Area PDFiumEngine::GetCharIndex(const pp::Point& point,
int* page_index,
int* char_index,
int* form_type,
PDFiumPage::LinkTarget* target) {
int page = -1;
pp::Point point_in_page(
static_cast<int>((point.x() + position_.x()) / current_zoom_),
static_cast<int>((point.y() + position_.y()) / current_zoom_));
for (int visible_page : visible_pages_) {
if (pages_[visible_page]->rect().Contains(point_in_page)) {
page = visible_page;
break;
}
}
if (page == -1)
return PDFiumPage::NONSELECTABLE_AREA;
// If the page hasn't finished rendering, calling into the page sometimes
// leads to hangs.
for (const auto& paint : progressive_paints_) {
if (paint.page_index() == page)
return PDFiumPage::NONSELECTABLE_AREA;
}
*page_index = page;
PDFiumPage::Area result = pages_[page]->GetCharIndex(
point_in_page, current_rotation_, char_index, form_type, target);
return (client_->IsPrintPreview() && result == PDFiumPage::WEBLINK_AREA)
? PDFiumPage::NONSELECTABLE_AREA
: result;
}
bool PDFiumEngine::OnMouseDown(const pp::MouseInputEvent& event) {
pp::MouseInputEvent normalized_event =
NormalizeMouseEvent(client_->GetPluginInstance(), event);
if (normalized_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT)
return OnLeftMouseDown(normalized_event);
if (normalized_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_MIDDLE)
return OnMiddleMouseDown(normalized_event);
if (normalized_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_RIGHT)
return OnRightMouseDown(normalized_event);
return false;
}
void PDFiumEngine::OnSingleClick(int page_index, int char_index) {
SetSelecting(true);
selection_.push_back(PDFiumRange(pages_[page_index].get(), char_index, 0));
}
void PDFiumEngine::OnMultipleClick(int click_count,
int page_index,
int char_index) {
DCHECK_GE(click_count, 2);
bool is_double_click = click_count == 2;
// 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);
if (FindMultipleClickBoundary(is_double_click, cur))
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 (FindMultipleClickBoundary(is_double_click, cur))
break;
}
selection_.push_back(PDFiumRange(pages_[page_index].get(), start_index,
end_index - start_index));
}
bool PDFiumEngine::OnLeftMouseDown(const pp::MouseInputEvent& event) {
SetMouseLeftButtonDown(true);
auto selection_invalidator =
std::make_unique<SelectionChangeInvalidator>(this);
selection_.clear();
int page_index = -1;
int char_index = -1;
int form_type = FPDF_FORMFIELD_UNKNOWN;
PDFiumPage::LinkTarget target;
pp::Point point = event.GetPosition();
PDFiumPage::Area area =
GetCharIndex(point, &page_index, &char_index, &form_type, &target);
DCHECK_GE(form_type, FPDF_FORMFIELD_UNKNOWN);
mouse_down_state_.Set(area, target);
// Decide whether to open link or not based on user action in mouse up and
// mouse move events.
if (IsLinkArea(area))
return true;
if (page_index != -1) {
last_page_mouse_down_ = page_index;
double page_x;
double page_y;
DeviceToPage(page_index, point, &page_x, &page_y);
bool is_form_text_area = IsFormTextArea(area, form_type);
FPDF_PAGE page = pages_[page_index]->GetPage();
bool is_editable_form_text_area =
is_form_text_area &&
IsPointInEditableFormTextArea(page, page_x, page_y, form_type);
if (event.GetClickCount() == 1) {
FORM_OnLButtonDown(form(), page, event.GetModifiers(), page_x, page_y);
} else if (event.GetClickCount() == 2) {
FORM_OnLButtonDoubleClick(form(), page, event.GetModifiers(), page_x,
page_y);
}
if (form_type != FPDF_FORMFIELD_UNKNOWN) {
// Destroy SelectionChangeInvalidator object before SetInFormTextArea()
// changes plugin's focus to be in form text area. This way, regular text
// selection can be cleared when a user clicks into a form text area
// because the pp::PDF::SetSelectedText() call in
// ~SelectionChangeInvalidator() still goes to the Mimehandler
// (not the Renderer).
selection_invalidator.reset();
SetInFormTextArea(is_form_text_area);
editable_form_text_area_ = is_editable_form_text_area;
return true; // Return now before we get into the selection code.
}
}
SetInFormTextArea(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;
}
bool PDFiumEngine::OnMiddleMouseDown(const pp::MouseInputEvent& event) {
SetMouseLeftButtonDown(false);
mouse_middle_button_down_ = true;
mouse_middle_button_last_position_ = event.GetPosition();
SelectionChangeInvalidator selection_invalidator(this);
selection_.clear();
int unused_page_index = -1;
int unused_char_index = -1;
int unused_form_type = FPDF_FORMFIELD_UNKNOWN;
PDFiumPage::LinkTarget target;
PDFiumPage::Area area =
GetCharIndex(event.GetPosition(), &unused_page_index, &unused_char_index,
&unused_form_type, &target);
mouse_down_state_.Set(area, target);
// Decide whether to open link or not based on user action in mouse up and
// mouse move events.
if (IsLinkArea(area))
return true;
if (kViewerImplementedPanning) {
// Switch to hand cursor when panning.
client_->UpdateCursor(PP_CURSORTYPE_HAND);
}
// Prevent middle mouse button from selecting texts.
return false;
}
bool PDFiumEngine::OnRightMouseDown(const pp::MouseInputEvent& event) {
DCHECK_EQ(PP_INPUTEVENT_MOUSEBUTTON_RIGHT, event.GetButton());
pp::Point point = event.GetPosition();
int page_index = -1;
int char_index = -1;
int form_type = FPDF_FORMFIELD_UNKNOWN;
PDFiumPage::LinkTarget target;
PDFiumPage::Area area =
GetCharIndex(point, &page_index, &char_index, &form_type, &target);
DCHECK_GE(form_type, FPDF_FORMFIELD_UNKNOWN);
bool is_form_text_area = IsFormTextArea(area, form_type);
bool is_editable_form_text_area = false;
double page_x = -1;
double page_y = -1;
FPDF_PAGE page = nullptr;
if (is_form_text_area) {
DCHECK_NE(page_index, -1);
DeviceToPage(page_index, point, &page_x, &page_y);
page = pages_[page_index]->GetPage();
is_editable_form_text_area =
IsPointInEditableFormTextArea(page, page_x, page_y, form_type);
}
// Handle the case when focus starts inside a form text area.
if (in_form_text_area_) {
if (is_form_text_area) {
FORM_OnFocus(form(), page, 0, page_x, page_y);
} else {
// Transition out of a form text area.
FORM_ForceToKillFocus(form());
SetInFormTextArea(false);
}
return true;
}
// Handle the case when focus starts outside a form text area and transitions
// into a form text area.
if (is_form_text_area) {
{
SelectionChangeInvalidator selection_invalidator(this);
selection_.clear();
}
SetInFormTextArea(true);
editable_form_text_area_ = is_editable_form_text_area;
FORM_OnFocus(form(), page, 0, page_x, page_y);
return true;
}
// Handle the case when focus starts outside a form text area and stays
// outside.
if (selection_.empty())
return false;
std::vector<pp::Rect> selection_rect_vector;
GetAllScreenRectsUnion(&selection_, GetVisibleRect().point(),
&selection_rect_vector);
for (const auto& rect : selection_rect_vector) {
if (rect.Contains(point.x(), point.y()))
return false;
}
SelectionChangeInvalidator selection_invalidator(this);
selection_.clear();
return true;
}
bool PDFiumEngine::OnMouseUp(const pp::MouseInputEvent& event) {
if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT &&
event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_MIDDLE) {
return false;
}
if (event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT)
SetMouseLeftButtonDown(false);
else if (event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_MIDDLE)
mouse_middle_button_down_ = false;
int page_index = -1;
int char_index = -1;
int form_type = FPDF_FORMFIELD_UNKNOWN;
PDFiumPage::LinkTarget target;
pp::Point point = event.GetPosition();
PDFiumPage::Area area =
GetCharIndex(point, &page_index, &char_index, &form_type, &target);
// Open link on mouse up for same link for which mouse down happened earlier.
if (mouse_down_state_.Matches(area, target)) {
uint32_t modifiers = event.GetModifiers();
bool middle_button =
!!(modifiers & PP_INPUTEVENT_MODIFIER_MIDDLEBUTTONDOWN);
bool alt_key = !!(modifiers & PP_INPUTEVENT_MODIFIER_ALTKEY);
bool ctrl_key = !!(modifiers & PP_INPUTEVENT_MODIFIER_CONTROLKEY);
bool meta_key = !!(modifiers & PP_INPUTEVENT_MODIFIER_METAKEY);
bool shift_key = !!(modifiers & PP_INPUTEVENT_MODIFIER_SHIFTKEY);
WindowOpenDisposition disposition = ui::DispositionFromClick(
middle_button, alt_key, ctrl_key, meta_key, shift_key);
if (area == PDFiumPage::WEBLINK_AREA) {
client_->NavigateTo(target.url, disposition);
SetInFormTextArea(false);
return true;
}
if (area == PDFiumPage::DOCLINK_AREA) {
if (!PageIndexInBounds(target.page))
return true;
if (disposition == WindowOpenDisposition::CURRENT_TAB) {
pp::Rect page_rect(GetPageScreenRect(target.page));
int y = position_.y() + page_rect.y();
if (target.y_in_pixels)
y += target.y_in_pixels.value() * current_zoom_;
client_->ScrollToY(y, /*compensate_for_toolbar=*/true);
} else {
std::string parameters =
base::StringPrintf("#page=%d", target.page + 1);
if (target.y_in_pixels) {
parameters += base::StringPrintf(
"&zoom=100,0,%d", static_cast<int>(target.y_in_pixels.value()));
}
client_->NavigateTo(parameters, disposition);
}
SetInFormTextArea(false);
return true;
}
}
if (event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_MIDDLE) {
if (kViewerImplementedPanning) {
// Update the cursor when panning stops.
client_->UpdateCursor(DetermineCursorType(area, form_type));
}
// Prevent middle mouse button from selecting texts.
return false;
}
if (page_index != -1) {
double page_x;
double page_y;
DeviceToPage(page_index, point, &page_x, &page_y);
FORM_OnLButtonUp(form(), pages_[page_index]->GetPage(),
event.GetModifiers(), page_x, page_y);
}
if (!selecting_)
return false;
SetSelecting(false);
return true;
}
bool PDFiumEngine::OnMouseMove(const pp::MouseInputEvent& event) {
int page_index = -1;
int char_index = -1;
int form_type = FPDF_FORMFIELD_UNKNOWN;
PDFiumPage::LinkTarget target;
pp::Point point = event.GetPosition();
PDFiumPage::Area area =
GetCharIndex(point, &page_index, &char_index, &form_type, &target);
// Clear |mouse_down_state_| if mouse moves away from where the mouse down
// happened.
if (!mouse_down_state_.Matches(area, target))
mouse_down_state_.Reset();
if (!selecting_) {
client_->UpdateCursor(DetermineCursorType(area, form_type));
if (page_index != -1) {
double page_x;
double page_y;
DeviceToPage(page_index, point, &page_x, &page_y);
FORM_OnMouseMove(form(), pages_[page_index]->GetPage(), 0, page_x,
page_y);
}
std::string url = GetLinkAtPosition(event.GetPosition());
if (url != link_under_cursor_) {
link_under_cursor_ = url;
pp::PDF::SetLinkUnderCursor(GetPluginInstance(), url.c_str());
}
// If in form text area while left mouse button is held down, check if form
// text selection needs to be updated.
if (mouse_left_button_down_ && area == PDFiumPage::FORM_TEXT_AREA &&
last_page_mouse_down_ != -1) {
SetFormSelectedText(form(), pages_[last_page_mouse_down_]->GetPage());
}
if (kViewerImplementedPanning && mouse_middle_button_down_) {
// Subtract (origin - destination) so delta is already the delta for
// moving the page, rather than the delta the mouse moved.
// GetMovement() does not work here, as small mouse movements are
// considered zero.
pp::Point page_position_delta =
mouse_middle_button_last_position_ - event.GetPosition();
if (page_position_delta.x() != 0 || page_position_delta.y() != 0) {
client_->ScrollBy(page_position_delta);
mouse_middle_button_last_position_ = event.GetPosition();
}
}
// 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 && !IsLinkArea(area))
return false;
SelectionChangeInvalidator selection_invalidator(this);
return ExtendSelection(page_index, char_index);
}
PP_CursorType_Dev PDFiumEngine::DetermineCursorType(PDFiumPage::Area area,
int form_type) const {
if (kViewerImplementedPanning && mouse_middle_button_down_) {
return PP_CURSORTYPE_HAND;
}
switch (area) {
case PDFiumPage::TEXT_AREA:
return PP_CURSORTYPE_IBEAM;
case PDFiumPage::WEBLINK_AREA:
case PDFiumPage::DOCLINK_AREA:
return PP_CURSORTYPE_HAND;
case PDFiumPage::NONSELECTABLE_AREA:
case PDFiumPage::FORM_TEXT_AREA:
default:
switch (form_type) {
case FPDF_FORMFIELD_PUSHBUTTON:
case FPDF_FORMFIELD_CHECKBOX:
case FPDF_FORMFIELD_RADIOBUTTON:
case FPDF_FORMFIELD_COMBOBOX:
case FPDF_FORMFIELD_LISTBOX:
return PP_CURSORTYPE_HAND;
case FPDF_FORMFIELD_TEXTFIELD:
return PP_CURSORTYPE_IBEAM;
#if defined(PDF_ENABLE_XFA)
case FPDF_FORMFIELD_XFA_CHECKBOX:
case FPDF_FORMFIELD_XFA_COMBOBOX:
case FPDF_FORMFIELD_XFA_IMAGEFIELD:
case FPDF_FORMFIELD_XFA_LISTBOX:
case FPDF_FORMFIELD_XFA_PUSHBUTTON:
case FPDF_FORMFIELD_XFA_SIGNATURE:
return PP_CURSORTYPE_HAND;
case FPDF_FORMFIELD_XFA_TEXTFIELD:
return PP_CURSORTYPE_IBEAM;
#endif
default:
return PP_CURSORTYPE_POINTER;
}
}
}
void PDFiumEngine::OnMouseEnter(const pp::MouseInputEvent& event) {
if (event.GetModifiers() & PP_INPUTEVENT_MODIFIER_MIDDLEBUTTONDOWN) {
if (!mouse_middle_button_down_) {
mouse_middle_button_down_ = true;
mouse_middle_button_last_position_ = event.GetPosition();
}
} else {
if (mouse_middle_button_down_) {
mouse_middle_button_down_ = false;
}
}
}
bool PDFiumEngine::ExtendSelection(int page_index, int char_index) {
// Check if the user has decreased 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_.empty())
return false;
PDFiumRange& last_selection = selection_.back();
const int last_page_index = last_selection.page_index();
const int last_char_index = last_selection.char_index();
if (last_page_index == page_index) {
// Selecting within a page.
int count = char_index - last_char_index;
if (count >= 0) {
// Selecting forward.
++count;
} else {
--count;
}
last_selection.SetCharCount(count);
} else if (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 = last_page_index + 1; i < page_index; ++i) {
selection_.push_back(
PDFiumRange(pages_[i].get(), 0, pages_[i]->GetCharCount()));
}
int count = pages_[last_page_index]->GetCharCount();
last_selection.SetCharCount(count - last_char_index);
selection_.push_back(PDFiumRange(pages_[page_index].get(), 0, char_index));
} else {
// Selecting into the previous page.
// The selection's char_index is 0-based, so the character count is one
// more than the index. The character count needs to be negative to
// indicate a backwards selection.
last_selection.SetCharCount(-last_char_index - 1);
// 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 = last_page_index - 1; i > page_index; --i) {
selection_.push_back(
PDFiumRange(pages_[i].get(), 0, pages_[i]->GetCharCount()));
}
int count = pages_[page_index]->GetCharCount();
selection_.push_back(
PDFiumRange(pages_[page_index].get(), 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) {
// Blink does not send char events for backspace or escape keys, see
// WebKeyboardEvent::IsCharacterKey() and b/961192 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;
// Check if form text selection needs to be updated.
FPDF_PAGE page = pages_[last_page_mouse_down_]->GetPage();
if (in_form_text_area_)
SetFormSelectedText(form(), page);
return !!FORM_OnKeyUp(form(), page, 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 std::string& text, bool case_sensitive) {
// If the caller asks StartFind() to search for no text, then this is an
// error on the part of the caller. The PPAPI Find_Private interface
// guarantees it is not empty, so this should never happen.
DCHECK(!text.empty());
// If StartFind() gets called 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 = (current_find_text_ != text);
int character_to_start_searching_from = 0;
if (first_search) {
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_;
}
search_in_progress_ = true;
}
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) {
search_in_progress_ = false;
// Send the final notification.
client_->NotifyNumberOfFindResultsChanged(find_results_.size(), true);
return;
}
// In unit tests, PPAPI is not initialized, so just call ContinueFind()
// directly.
if (g_create_document_loader_for_testing) {
ContinueFind(case_sensitive ? 1 : 0);
} 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].get(),
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) {
DCHECK(!term.empty());
// Various types of quotions marks need to be converted to the simple ASCII
// version for searching to get better matching.
base::string16 adjusted_term = term;
for (base::char16& c : adjusted_term)
c = SimplifyForSearch(c);
const int original_text_length = pages_[current_page]->GetCharCount();
int text_length = original_text_length;
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;
base::string16 page_text;
PDFiumAPIStringBufferAdapter<base::string16> api_string_adapter(
&page_text, text_length, false);
unsigned short* data =
reinterpret_cast<unsigned short*>(api_string_adapter.GetData());
int written =
FPDFText_GetText(pages_[current_page]->GetTextPage(),
character_to_start_searching_from, text_length, data);
api_string_adapter.Close(written);
base::string16 adjusted_page_text;
adjusted_page_text.reserve(page_text.size());
// Values in |removed_indices| are in the adjusted text index space and
// indicate a character was removed from the page text before the given
// index. If multiple characters are removed in a row then there will be
// multiple entries with the same value.
std::vector<size_t> removed_indices;
// When walking through the page text collapse any whitespace regions,
// including \r and \n, down to a single ' ' character. This code does
// not use base::CollapseWhitespace(), because that function does not
// return where the collapsing occurs, but uses the same underlying list of
// whitespace characters. Calculating where the collapsed regions are after
// the fact is as complex as collapsing them manually.
for (size_t i = 0; i < page_text.size(); i++) {
base::char16 c = page_text[i];
// Collapse whitespace regions by inserting a ' ' into the
// adjusted text and recording any removed whitespace indices as preceding
// it.
if (base::IsUnicodeWhitespace(c)) {
size_t whitespace_region_begin = i;
while (i < page_text.size() && base::IsUnicodeWhitespace(page_text[i]))
++i;
size_t count = i - whitespace_region_begin - 1;
removed_indices.insert(removed_indices.end(), count,
adjusted_page_text.size());
adjusted_page_text.push_back(' ');
if (i >= page_text.size())
break;
c = page_text[i];
}
if (IsIgnorableCharacter(c))
removed_indices.push_back(adjusted_page_text.size());
else
adjusted_page_text.push_back(SimplifyForSearch(c));
}
std::vector<PDFEngine::Client::SearchStringResult> results =
client_->SearchString(adjusted_page_text.c_str(), adjusted_term.c_str(),
case_sensitive);
for (const auto& result : results) {
// Need to convert from adjusted page text start to page text start, by
// incrementing for all the characters adjusted before it in the string.
auto removed_indices_begin = std::upper_bound(
removed_indices.begin(), removed_indices.end(), result.start_index);
size_t page_text_result_start_index =
result.start_index +
std::distance(removed_indices.begin(), removed_indices_begin);
// Need to convert the adjusted page length into a page text length, since
// the matching range may have adjusted characters within it. This
// conversion only cares about skipped characters in the result interval.
auto removed_indices_end =
std::upper_bound(removed_indices_begin, removed_indices.end(),
result.start_index + result.length);
int term_removed_count =
std::distance(removed_indices_begin, removed_indices_end);
int page_text_result_length = result.length + term_removed_count;
// Need to map the indexes from the page text, which may have generated
// characters like space etc, to character indices from the page.
int text_to_start_searching_from = FPDFText_GetTextIndexFromCharIndex(
pages_[current_page]->GetTextPage(), character_to_start_searching_from);
int temp_start =
page_text_result_start_index + text_to_start_searching_from;
int start = FPDFText_GetCharIndexFromTextIndex(
pages_[current_page]->GetTextPage(), temp_start);
int end = FPDFText_GetCharIndexFromTextIndex(
pages_[current_page]->GetTextPage(),
temp_start + page_text_result_length);
// If |term| occurs at the end of a page, then |end| will be -1 due to the
// index being out of bounds. Compensate for this case so the range
// character count calculation below works out.
if (temp_start + page_text_result_length == original_text_length) {
DCHECK_EQ(-1, end);
end = original_text_length;
}
DCHECK_LT(start, end);
DCHECK_EQ(term.size() + term_removed_count,
static_cast<size_t>(end - start));
AddFindResult(PDFiumRange(pages_[current_page].get(), start, end - start));
}
}
void PDFiumEngine::AddFindResult(const PDFiumRange& result) {
bool first_result = find_results_.empty();
// Figure out where to insert the new location, since we could have
// started searching midway and now we wrapped.
size_t result_index;
int page_index = result.page_index();
int char_index = result.char_index();
for (result_index = 0; result_index < find_results_.size(); ++result_index) {
if (find_results_[result_index].page_index() > page_index ||
(find_results_[result_index].page_index() == page_index &&
find_results_[result_index].char_index() > char_index)) {
break;
}
}
find_results_.insert(find_results_.begin() + result_index, result);
UpdateTickMarks();
client_->NotifyNumberOfFindResultsChanged(find_results_.size(), false);
if (first_result) {
DCHECK(!resume_find_index_);
DCHECK(!current_find_index_);
SelectFindResult(/*forward=*/true);
}
}
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.
size_t new_index;
const size_t last_index = find_results_.size() - 1;
if (resume_find_index_) {
new_index = resume_find_index_.value();
resume_find_index_.reset();
} else if (current_find_index_) {
size_t current_index = current_find_index_.value();
if ((forward && current_index >= last_index) ||
(!forward && current_index == 0)) {
current_find_index_.reset();
client_->NotifySelectedFindResultChanged(-1);
client_->NotifyNumberOfFindResultsChanged(find_results_.size(), true);
return true;
}
int increment = forward ? 1 : -1;
new_index = current_index + increment;
} else {
new_index = forward ? 0 : last_index;
}
current_find_index_ = new_index;
// Update the selection before telling the client to scroll, since it could
// paint then.
selection_.clear();
selection_.push_back(find_results_[current_find_index_.value()]);
// If the result is not in view, scroll to it.
pp::Rect bounding_rect;
pp::Rect visible_rect = GetVisibleRect();
// Use zoom of 1.0 since |visible_rect| is without zoom.
const std::vector<pp::Rect>& rects =
find_results_[current_find_index_.value()].GetScreenRects(
pp::Point(), 1.0, current_rotation_);
for (const auto& rect : rects)
bounding_rect = bounding_rect.Union(rect);
if (!visible_rect.Contains(bounding_rect)) {
pp::Point center = bounding_rect.CenterPoint();
// Make the page centered.
int new_y = CalculateCenterForZoom(center.y(), visible_rect.height(),
current_zoom_);
client_->ScrollToY(new_y, /*compensate_for_toolbar=*/false);
// Only move horizontally if it's not visible.
if (center.x() < visible_rect.x() || center.x() > visible_rect.right()) {
int new_x = CalculateCenterForZoom(center.x(), visible_rect.width(),
current_zoom_);
client_->ScrollToX(new_x);
}
}
client_->NotifySelectedFindResultChanged(current_find_index_.value());
if (!search_in_progress_)
client_->NotifyNumberOfFindResultsChanged(find_results_.size(), true);
return true;
}
void PDFiumEngine::StopFind() {
SelectionChangeInvalidator selection_invalidator(this);
selection_.clear();
selecting_ = false;
find_results_.clear();
search_in_progress_ = false;
next_page_to_search_ = -1;
last_page_to_search_ = -1;
last_character_index_to_search_ = -1;
current_find_index_.reset();
current_find_text_.clear();
UpdateTickMarks();
find_factory_.CancelAll();
}
void PDFiumEngine::GetAllScreenRectsUnion(std::vector<PDFiumRange>* rect_range,
const pp::Point& offset_point,
std::vector<pp::Rect>* rect_vector) {
for (auto& range : *rect_range) {
pp::Rect result_rect;
const std::vector<pp::Rect>& rects =
range.GetScreenRects(offset_point, current_zoom_, current_rotation_);
for (const auto& rect : rects)
result_rect = result_rect.Union(rect);
rect_vector->push_back(result_rect);
}
}
void PDFiumEngine::UpdateTickMarks() {
std::vector<pp::Rect> tickmarks;
GetAllScreenRectsUnion(&find_results_, pp::Point(0, 0), &tickmarks);
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;
RotateInternal();
}
void PDFiumEngine::RotateCounterclockwise() {
current_rotation_ = (current_rotation_ - 1) % 4;
RotateInternal();
}
void PDFiumEngine::InvalidateAllPages() {
CancelPaints();
StopFind();
LoadPageInfo(true);
client_->Invalidate(pp::Rect(plugin_size_));
}
std::string PDFiumEngine::GetSelectedText() {
if (!HasPermission(PDFEngine::PERMISSION_COPY))
return std::string();
base::string16 result;
for (size_t i = 0; i < selection_.size(); ++i) {
static constexpr base::char16 kNewLineChar = L'\n';
base::string16 current_selection_text = selection_[i].GetText();
if (i != 0) {
if (selection_[i - 1].page_index() > selection_[i].page_index())
std::swap(current_selection_text, result);
result.push_back(kNewLineChar);
}
result.append(current_selection_text);
}
FormatStringWithHyphens(&result);
FormatStringForOS(&result);
return base::UTF16ToUTF8(result);
}
bool PDFiumEngine::CanEditText() {
return editable_form_text_area_;
}
bool PDFiumEngine::HasEditableText() {
DCHECK(CanEditText());
if (last_page_mouse_down_ == -1)
return false;
FPDF_PAGE page = pages_[last_page_mouse_down_]->GetPage();
// If the return value is 2, that corresponds to "\0\0".
return FORM_GetFocusedText(form(), page, nullptr, 0) > 2;
}
void PDFiumEngine::ReplaceSelection(const std::string& text) {
DCHECK(CanEditText());
if (last_page_mouse_down_ != -1) {
base::string16 text_wide = base::UTF8ToUTF16(text);
FPDF_WIDESTRING text_pdf_wide =
reinterpret_cast<FPDF_WIDESTRING>(text_wide.c_str());
FORM_ReplaceSelection(form(), pages_[last_page_mouse_down_]->GetPage(),
text_pdf_wide);
}
}
bool PDFiumEngine::CanUndo() {
if (last_page_mouse_down_ == -1)
return false;
return !!FORM_CanUndo(form(), pages_[last_page_mouse_down_]->GetPage());
}
bool PDFiumEngine::CanRedo() {
if (last_page_mouse_down_ == -1)
return false;
return !!FORM_CanRedo(form(), pages_[last_page_mouse_down_]->GetPage());
}
void PDFiumEngine::Undo() {
if (last_page_mouse_down_ != -1)
FORM_Undo(form(), pages_[last_page_mouse_down_]->GetPage());
}
void PDFiumEngine::Redo() {
if (last_page_mouse_down_ != -1)
FORM_Redo(form(), pages_[last_page_mouse_down_]->GetPage());
}
std::string PDFiumEngine::GetLinkAtPosition(const pp::Point& point) {
std::string url;
int temp;
int page_index = -1;
int form_type = FPDF_FORMFIELD_UNKNOWN;
PDFiumPage::LinkTarget target;
PDFiumPage::Area area =
GetCharIndex(point, &page_index, &temp, &form_type, &target);
if (area == PDFiumPage::WEBLINK_AREA)
url = target.url;
return url;
}
bool PDFiumEngine::HasPermission(DocumentPermission permission) const {
// PDF 1.7 spec, section 3.5.2 says: "If the revision number is 2 or greater,
// the operations to which user access can be controlled are as follows: ..."
//
// Thus for revision numbers less than 2, permissions are ignored and this
// always returns true.
if (permissions_handler_revision_ < 2)
return true;
// Handle high quality printing permission separately for security handler
// revision 3+. See table 3.20 in the PDF 1.7 spec.
if (permission == PERMISSION_PRINT_HIGH_QUALITY &&
permissions_handler_revision_ >= 3) {
return (permissions_ & kPDFPermissionPrintLowQualityMask) != 0 &&
(permissions_ & kPDFPermissionPrintHighQualityMask) != 0;
}
switch (permission) {
case PERMISSION_COPY:
return (permissions_ & kPDFPermissionCopyMask) != 0;
case PERMISSION_COPY_ACCESSIBLE:
return (permissions_ & kPDFPermissionCopyAccessibleMask) != 0;
case PERMISSION_PRINT_LOW_QUALITY:
case PERMISSION_PRINT_HIGH_QUALITY:
// With security handler revision 2 rules, check the same bit for high
// and low quality. See table 3.20 in the PDF 1.7 spec.
return (permissions_ & kPDFPermissionPrintLowQualityMask) != 0;
default:
return true;
}
}
void PDFiumEngine::SelectAll() {
if (in_form_text_area_)
return;
SelectionChangeInvalidator selection_invalidator(this);
selection_.clear();
for (const auto& page : pages_) {
if (page->available())
selection_.push_back(PDFiumRange(page.get(), 0, page->GetCharCount()));
}
}
int PDFiumEngine::GetNumberOfPages() {
return pages_.size();
}
pp::VarArray PDFiumEngine::GetBookmarks() {
pp::VarDictionary dict = TraverseBookmarks(nullptr, 0);
// The root bookmark contains no useful information.
return pp::VarArray(dict.Get(pp::Var("children")));
}
pp::VarDictionary PDFiumEngine::TraverseBookmarks(FPDF_BOOKMARK bookmark,
unsigned int depth) {
pp::VarDictionary dict;
base::string16 title;
unsigned long buffer_size = FPDFBookmark_GetTitle(bookmark, nullptr, 0);
if (buffer_size > 0) {
PDFiumAPIStringBufferSizeInBytesAdapter<base::string16> api_string_adapter(
&title, buffer_size, true);
api_string_adapter.Close(FPDFBookmark_GetTitle(
bookmark, api_string_adapter.GetData(), buffer_size));
}
dict.Set(pp::Var("title"), pp::Var(base::UTF16ToUTF8(title)));
FPDF_DEST dest = FPDFBookmark_GetDest(doc(), bookmark);
// Some bookmarks don't have a page to select.
if (dest) {
int page_index = FPDFDest_GetDestPageIndex(doc(), dest);
if (PageIndexInBounds(page_index)) {
dict.Set(pp::Var("page"), pp::Var(page_index));
base::Optional<gfx::PointF> xy =
pages_[page_index]->GetPageXYTarget(dest);
if (xy)
dict.Set(pp::Var("y"), pp::Var(static_cast<int>(xy.value().y())));
}
} else {
// Extract URI for bookmarks linking to an external page.
FPDF_ACTION action = FPDFBookmark_GetAction(bookmark);
buffer_size = FPDFAction_GetURIPath(doc(), action, nullptr, 0);
if (buffer_size > 0) {
std::string uri;
PDFiumAPIStringBufferAdapter<std::string> api_string_adapter(
&uri, buffer_size, true);
api_string_adapter.Close(FPDFAction_GetURIPath(
doc(), action, api_string_adapter.GetData(), buffer_size));
dict.Set(pp::Var("uri"), pp::Var(uri));
}
}
pp::VarArray children;
// Don't trust PDFium to handle circular bookmarks.
constexpr unsigned int kMaxDepth = 128;
if (depth < kMaxDepth) {
int child_index = 0;
std::set<FPDF_BOOKMARK> seen_bookmarks;
for (FPDF_BOOKMARK child_bookmark =
FPDFBookmark_GetFirstChild(doc(), bookmark);
child_bookmark;
child_bookmark = FPDFBookmark_GetNextSibling(doc(), child_bookmark)) {
if (base::ContainsKey(seen_bookmarks, child_bookmark))
break;
seen_bookmarks.insert(child_bookmark);
children.Set(child_index, TraverseBookmarks(child_bookmark, depth + 1));
child_index++;
}
}
dict.Set(pp::Var("children"), children);
return dict;
}
base::Optional<PDFEngine::NamedDestination> PDFiumEngine::GetNamedDestination(
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)
dest = FPDFBookmark_GetDest(doc(), bookmark);
}
if (!dest)
return {};
int page = FPDFDest_GetDestPageIndex(doc(), dest);
if (page < 0)
return {};
PDFEngine::NamedDestination result;
result.page = page;
unsigned long view_int =
FPDFDest_GetView(dest, &result.num_params, result.params);
result.view = ConvertViewIntToViewString(view_int);
return result;
}
gfx::PointF PDFiumEngine::TransformPagePoint(int page_index,
const gfx::PointF& page_xy) {
DCHECK(PageIndexInBounds(page_index));
return pages_[page_index]->TransformPageToScreenXY(page_xy);
}
int PDFiumEngine::GetMostVisiblePage() {
if (in_flight_visible_page_)
return *in_flight_visible_page_;
// We can call GetMostVisiblePage through a callback from PDFium. We have
// to defer the page deletion otherwise we could potentially delete the page
// that originated the calling JS request and destroy the objects that are
// currently being used.
base::AutoReset<bool> defer_page_unload_guard(&defer_page_unload_, true);
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::GetPageBoundsRect(int index) {
return pages_[index]->rect();
}
pp::Rect PDFiumEngine::GetPageContentsRect(int index) {
return GetScreenRect(pages_[index]->rect());
}
int PDFiumEngine::GetVerticalScrollbarYPosition() {
return position_.y();
}
void PDFiumEngine::SetGrayscale(bool grayscale) {
render_grayscale_ = grayscale;
}
void PDFiumEngine::HandleLongPress(const pp::TouchInputEvent& event) {
pp::FloatPoint fp =
event.GetTouchByIndex(PP_TOUCHLIST_TYPE_TARGETTOUCHES, 0).position();
pp::Point point;
point.set_x(fp.x());
point.set_y(fp.y());
// Send a fake mouse down to trigger the multi-click selection code.
pp::MouseInputEvent mouse_event(
client_->GetPluginInstance(), PP_INPUTEVENT_TYPE_MOUSEDOWN,
event.GetTimeStamp(), event.GetModifiers(),
PP_INPUTEVENT_MOUSEBUTTON_LEFT, point, 2, point);
OnMouseDown(mouse_event);
}
int PDFiumEngine::GetCharCount(int page_index) {
DCHECK(PageIndexInBounds(page_index));
return pages_[page_index]->GetCharCount();
}
pp::FloatRect PDFiumEngine::GetCharBounds(int page_index, int char_index) {
DCHECK(PageIndexInBounds(page_index));
return pages_[page_index]->GetCharBounds(char_index);
}
uint32_t PDFiumEngine::GetCharUnicode(int page_index, int char_index) {
DCHECK(PageIndexInBounds(page_index));
return pages_[page_index]->GetCharUnicode(char_index);
}
void PDFiumEngine::GetTextRunInfo(int page_index,
int start_char_index,
uint32_t* out_len,
double* out_font_size,
pp::FloatRect* out_bounds) {
DCHECK(PageIndexInBounds(page_index));
return pages_[page_index]->GetTextRunInfo(start_char_index, out_len,
out_font_size, out_bounds);
}
bool PDFiumEngine::GetPrintScaling() {
return !!FPDF_VIEWERREF_GetPrintScaling(doc());
}
int PDFiumEngine::GetCopiesToPrint() {
return FPDF_VIEWERREF_GetNumCopies(doc());
}
int PDFiumEngine::GetDuplexType() {
return static_cast<int>(FPDF_VIEWERREF_GetDuplex(doc()));
}
bool PDFiumEngine::GetPageSizeAndUniformity(pp::Size* size) {
if (pages_.empty())
return false;
pp::Size page_size = GetPageSize(0);
for (size_t i = 1; i < pages_.size(); ++i) {
if (page_size != GetPageSize(i))
return false;
}
// Convert |page_size| back to points.
size->set_width(
ConvertUnit(page_size.width(), kPixelsPerInch, kPointsPerInch));
size->set_height(
ConvertUnit(page_size.height(), kPixelsPerInch, kPointsPerInch));
return true;
}
void PDFiumEngine::AppendBlankPages(int num_pages) {
DCHECK_NE(num_pages, 0);
if (!doc())
return;
selection_.clear();
pending_pages_.clear();
// Delete all pages except the first one.
while (pages_.size() > 1) {
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 =
ConvertUnitDouble(page_rect.width(), kPixelsPerInch, kPointsPerInch);
double height_in_points =
ConvertUnitDouble(page_rect.height(), kPixelsPerInch, kPointsPerInch);
{
// Add a new page to the document, but delete the FPDF_PAGE object.
ScopedFPDFPage temp_page(
FPDFPage_New(doc(), i, width_in_points, height_in_points));
}
pages_.push_back(std::make_unique<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()) {
FX_DOWNLOADHINTS& download_hints = document_->download_hints();
if (!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);
ScopedSubstFont scoped_subst_font(this);
bool needs_password = false;
if (TryLoadingDoc(std::string(), &needs_password)) {
ContinueLoadingDocument(std::string());
return;
}
if (needs_password)
GetPasswordAndLoad();
else
client_->DocumentLoadFailed();
}
bool PDFiumEngine::TryLoadingDoc(const std::string& password,
bool* needs_password) {
*needs_password = false;
if (doc()) {
// This is probably not necessary, because it should have already been
// called below in the |doc_| initialization path. However, the previous
// call may have failed, so call it again for good measure.
FX_DOWNLOADHINTS& download_hints = document_->download_hints();
FPDFAvail_IsDocAvail(fpdf_availability(), &download_hints);
return true;
}
const char* password_cstr = nullptr;
if (!password.empty()) {
password_cstr = password.c_str();
password_tries_remaining_--;
}
document_->LoadDocument(password_cstr);
if (!doc()) {
if (FPDF_GetLastError() == FPDF_ERR_PASSWORD)
*needs_password = true;
return false;
}
// Always call FPDFAvail_IsDocAvail() so PDFium initializes internal data
// structures.
FX_DOWNLOADHINTS& download_hints = document_->download_hints();
FPDFAvail_IsDocAvail(fpdf_availability(), &download_hints);
return true;
}
void PDFiumEngine::GetPasswordAndLoad() {
getting_password_ = true;
DCHECK(!doc());
DCHECK_EQ(static_cast<unsigned long>(FPDF_ERR_PASSWORD), FPDF_GetLastError());
client_->GetDocumentPassword(password_factory_.NewCallbackWithOutput(
&PDFiumEngine::OnGetPasswordComplete));
}
void PDFiumEngine::OnGetPasswordComplete(int32_t result,
const pp::Var& password) {
getting_password_ = false;
std::string password_text;
if (result == PP_OK && password.is_string())
password_text = password.AsString();
ContinueLoadingDocument(password_text);
}
void PDFiumEngine::ContinueLoadingDocument(const std::string& password) {
ScopedUnsupportedFeature scoped_unsupported_feature(this);
ScopedSubstFont scoped_subst_font(this);
bool needs_password = false;
bool loaded = TryLoadingDoc(password, &needs_password);
bool password_incorrect = !loaded && needs_password && !password.empty();
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());
permissions_handler_revision_ = FPDF_GetSecurityHandlerRevision(doc());
LoadBody();
if (doc_loader_->IsDocumentComplete())
FinishLoadingDocument();
}
void PDFiumEngine::LoadPageInfo(bool reload) {
if (!doc_loader_)
return;
if (pages_.empty() && reload)
return;
pending_pages_.clear();
pp::Size old_document_size = document_size_;
document_size_ = pp::Size();
std::vector<pp::Rect> page_rects;
size_t new_page_count = FPDF_GetPageCount(doc());
bool doc_complete = doc_loader_->IsDocumentComplete();
bool is_linear =
FPDFAvail_IsLinearized(fpdf_availability()) == PDF_LINEARIZED;
for (size_t i = 0; i < new_page_count; ++i) {
if (i != 0) {
// Add space for horizontal separator.
document_size_.Enlarge(0, kPageSeparatorThickness);
}
// Get page availability. If |reload| == true and the page is not new,
// then the page has been constructed already. Get page availability flag
// from already existing PDFiumPage object.
// If |reload| == false or the page is new, then the page may not be fully
// loaded yet.
bool page_available;
if (reload && i < pages_.size()) {
page_available = pages_[i]->available();
} else if (is_linear) {
FX_DOWNLOADHINTS& download_hints = document_->download_hints();
int linear_page_avail =
FPDFAvail_IsPageAvail(fpdf_availability(), i, &download_hints);
page_available = linear_page_avail == PDF_DATA_AVAIL;
} else {
page_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 (size_t i = 0; i < new_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) {
// The page is marked as not being available even if |doc_complete| is
// true because FPDFAvail_IsPageAvail() still has to be called for this
// page, which will be done in FinishLoadingDocument().
pages_.push_back(std::make_unique<PDFiumPage>(this, i, page_rect, false));
} else if (i < pages_.size()) {
pages_[i]->set_rect(page_rect);
} else {
bool available = FPDFAvail_IsPageAvail(fpdf_availability(), i, nullptr);
pages_.push_back(
std::make_unique<PDFiumPage>(this, i, page_rect, available));
}
}
// Remove pages that do not exist anymore.
if (pages_.size() > new_page_count) {
for (size_t i = new_page_count; i < pages_.size(); ++i)
pages_[i]->Unload();
pages_.resize(new_page_count);
}
CalculateVisiblePages();
if (document_size_ != old_document_size)
client_->DocumentSizeUpdated(document_size_);
}
void PDFiumEngine::LoadBody() {
DCHECK(doc());
DCHECK(fpdf_availability());
if (doc_loader_->IsDocumentComplete()) {
LoadForm();
} else if (FPDFAvail_IsLinearized(fpdf_availability()) == PDF_LINEARIZED &&
FPDF_GetPageCount(doc()) == 1) {
// If we have only one page we should load form first, bacause it is may be
// XFA document. And after loading form the page count and its contents may
// be changed.
LoadForm();
if (document_->form_status() == PDF_FORM_NOTAVAIL)
return;
}
LoadPages();
}
void PDFiumEngine::LoadPages() {
if (pages_.empty()) {
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);
}
}
void PDFiumEngine::LoadForm() {
if (form())
return;
DCHECK(doc());
document_->SetFormStatus();
if (document_->form_status() != PDF_FORM_NOTAVAIL ||
doc_loader_->IsDocumentComplete()) {
document_->InitializeForm(&form_filler_);
#if defined(PDF_ENABLE_XFA)
FPDF_LoadXFA(doc());
#endif
FPDF_SetFormFieldHighlightColor(form(), FPDF_FORMFIELD_UNKNOWN,
kFormHighlightColor);
FPDF_SetFormFieldHighlightAlpha(form(), kFormHighlightAlpha);
}
}
void PDFiumEngine::CalculateVisiblePages() {
// Early return if the PDF isn't being loaded or if we don't have the document
// info yet. The latter is important because otherwise as the PDF is being
// initialized by the renderer there could be races that call this method
// before we get the initial network responses. The document loader depends on
// the list of pending requests to be valid for progressive loading to
// function.
if (!doc_loader_ || pages_.empty())
return;
// 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();
std::vector<int> formerly_visible_pages;
std::swap(visible_pages_, formerly_visible_pages);
pp::Rect visible_rect(plugin_size_);
for (int i = 0; i < static_cast<int>(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);
if (CheckPageAvailable(i, &pending_pages_)) {
auto it = std::find(formerly_visible_pages.begin(),
formerly_visible_pages.end(), i);
if (it == formerly_visible_pages.end())
client_->NotifyPageBecameVisible(pages_[i]->GetPageFeatures());
}
} 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();
int most_visible_page = visible_pages_.empty() ? -1 : visible_pages_.front();