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docuseal/lib/pdfium.rb

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# frozen_string_literal: true
class Pdfium
extend FFI::Library
LIB_NAME = 'pdfium'
begin
ffi_lib case FFI::Platform::OS
when 'darwin'
[
"lib#{LIB_NAME}.dylib",
'/Applications/LibreOffice.app/Contents/Frameworks/libpdfiumlo.dylib'
]
else
"lib#{LIB_NAME}.so"
end
rescue LoadError => e
raise "Could not load libpdfium library. Make sure it's installed and in your library path. Error: #{e.message}"
end
typedef :pointer, :FPDF_STRING
typedef :pointer, :FPDF_DOCUMENT
typedef :pointer, :FPDF_PAGE
typedef :pointer, :FPDF_BITMAP
typedef :pointer, :FPDF_FORMHANDLE
typedef :pointer, :FPDF_TEXTPAGE
typedef :pointer, :FPDF_PAGEOBJECT
typedef :pointer, :FPDF_PATHSEGMENT
typedef :pointer, :FPDF_FONT
MAX_SIZE = 32_767
BLANK_TEXT_CODEPOINTS = [0x00, 0x09, 0x0A, 0x0D, 0x20, 0xA0].freeze
FPDF_ANNOT = 0x01
FPDF_LCD_TEXT = 0x02
FPDF_NO_NATIVETEXT = 0x04
FPDF_GRAYSCALE = 0x08
FPDF_REVERSE_BYTE_ORDER = 0x10
FPDF_RENDER_LIMITEDIMAGECACHE = 0x200
FPDF_RENDER_FORCEHALFTONE = 0x400
FPDF_PRINTING = 0x800
TextObject = Struct.new(:content, :x, :y, :w, :h, :font_size) do
def endx
@endx ||= x + w
end
def endy
@endy ||= y + h
end
end
TextNode = Struct.new(:content, :x, :y, :w, :h) do
def endx
@endx ||= x + w
end
def endy
@endy ||= y + h
end
end
LineNode = Struct.new(:x, :y, :w, :h, :tilt) do
def endy
@endy ||= y + h
end
def endx
@endx ||= x + w
end
end
ImageNode = Struct.new(:x, :y, :w, :h) do
def endx
@endx ||= x + w
end
def endy
@endy ||= y + h
end
end
# rubocop:disable Naming/ClassAndModuleCamelCase
class FPDF_LIBRARY_CONFIG < FFI::Struct
layout :version, :int,
:m_pUserFontPaths, :pointer,
:m_pIsolate, :pointer,
:m_v8EmbedderSlot, :uint,
:m_pPlatform, :pointer,
:m_RendererType, :int
end
# rubocop:enable Naming/ClassAndModuleCamelCase
attach_function :FPDF_InitLibraryWithConfig, [:pointer], :void
attach_function :FPDF_DestroyLibrary, [], :void
attach_function :FPDF_LoadDocument, %i[string FPDF_STRING], :FPDF_DOCUMENT
attach_function :FPDF_LoadMemDocument, %i[pointer int FPDF_STRING], :FPDF_DOCUMENT
attach_function :FPDF_CloseDocument, [:FPDF_DOCUMENT], :void
attach_function :FPDF_GetPageCount, [:FPDF_DOCUMENT], :int
attach_function :FPDF_GetLastError, [], :ulong
attach_function :FPDF_LoadPage, %i[FPDF_DOCUMENT int], :FPDF_PAGE
attach_function :FPDF_ClosePage, [:FPDF_PAGE], :void
attach_function :FPDF_GetPageWidthF, [:FPDF_PAGE], :float
attach_function :FPDF_GetPageHeightF, [:FPDF_PAGE], :float
attach_function :FPDFBitmap_Create, %i[int int int], :FPDF_BITMAP
attach_function :FPDFBitmap_CreateEx, %i[int int int pointer int], :FPDF_BITMAP
attach_function :FPDFBitmap_Destroy, [:FPDF_BITMAP], :void
attach_function :FPDFBitmap_GetBuffer, [:FPDF_BITMAP], :pointer
attach_function :FPDFBitmap_GetWidth, [:FPDF_BITMAP], :int
attach_function :FPDFBitmap_GetHeight, [:FPDF_BITMAP], :int
attach_function :FPDFBitmap_GetStride, [:FPDF_BITMAP], :int
attach_function :FPDFBitmap_GetFormat, [:FPDF_BITMAP], :int
attach_function :FPDFBitmap_FillRect, %i[FPDF_BITMAP int int int int ulong], :void
FPDF_BITMAP_GRAY = 1
FPDF_BITMAP_BGR = 2
FPDF_BITMAP_BGRX = 3
FPDF_BITMAP_BGRA = 4
BITMAP_FORMAT_BANDS = {
FPDF_BITMAP_GRAY => [:gray, 1],
FPDF_BITMAP_BGR => [:bgr, 3],
FPDF_BITMAP_BGRX => [:bgrx, 4],
FPDF_BITMAP_BGRA => [:bgra, 4]
}.freeze
attach_function :FPDF_RenderPageBitmap, %i[FPDF_BITMAP FPDF_PAGE int int int int int int], :void
attach_function :FPDFText_LoadPage, [:FPDF_PAGE], :FPDF_TEXTPAGE
attach_function :FPDFText_ClosePage, [:FPDF_TEXTPAGE], :void
attach_function :FPDFText_CountChars, [:FPDF_TEXTPAGE], :int
attach_function :FPDFText_GetText, %i[FPDF_TEXTPAGE int int pointer], :int
attach_function :FPDFText_GetUnicode, %i[FPDF_TEXTPAGE int], :uint
attach_function :FPDFText_GetCharBox, %i[FPDF_TEXTPAGE int pointer pointer pointer pointer], :int
attach_function :FPDFText_GetCharOrigin, %i[FPDF_TEXTPAGE int pointer pointer], :int
attach_function :FPDFText_GetCharIndexAtPos, %i[FPDF_TEXTPAGE double double double double], :int
attach_function :FPDFText_CountRects, %i[FPDF_TEXTPAGE int int], :int
attach_function :FPDFText_GetRect, %i[FPDF_TEXTPAGE int pointer pointer pointer pointer], :int
attach_function :FPDFText_GetFontSize, %i[FPDF_TEXTPAGE int], :double
attach_function :FPDFText_GetLooseCharBox, %i[FPDF_TEXTPAGE int pointer], :int
# Page object functions for extracting paths/lines
attach_function :FPDFPage_CountObjects, [:FPDF_PAGE], :int
attach_function :FPDFPage_GetObject, %i[FPDF_PAGE int], :FPDF_PAGEOBJECT
attach_function :FPDFPageObj_GetType, [:FPDF_PAGEOBJECT], :int
attach_function :FPDFPageObj_GetBounds, %i[FPDF_PAGEOBJECT pointer pointer pointer pointer], :int
attach_function :FPDFPath_CountSegments, [:FPDF_PAGEOBJECT], :int
attach_function :FPDFPath_GetPathSegment, %i[FPDF_PAGEOBJECT int], :FPDF_PATHSEGMENT
attach_function :FPDFPathSegment_GetType, [:FPDF_PATHSEGMENT], :int
attach_function :FPDFPathSegment_GetPoint, %i[FPDF_PATHSEGMENT pointer pointer], :int
# Text page object functions (per-run Tj/TJ extraction)
attach_function :FPDFTextObj_GetText, %i[FPDF_PAGEOBJECT FPDF_TEXTPAGE pointer ulong], :ulong
attach_function :FPDFTextObj_GetFontSize, %i[FPDF_PAGEOBJECT pointer], :int
attach_function :FPDFPage_InsertObject, %i[FPDF_PAGE FPDF_PAGEOBJECT], :void
attach_function :FPDFPage_RemoveObject, %i[FPDF_PAGE FPDF_PAGEOBJECT], :int
attach_function :FPDFPage_GenerateContent, [:FPDF_PAGE], :int
attach_function :FPDFPageObj_Destroy, [:FPDF_PAGEOBJECT], :void
attach_function :FPDFText_GetTextObject, %i[FPDF_TEXTPAGE int], :FPDF_PAGEOBJECT
attach_function :FPDFTextObj_GetFont, [:FPDF_PAGEOBJECT], :FPDF_FONT
attach_function :FPDFText_LoadStandardFont, %i[FPDF_DOCUMENT string], :FPDF_FONT
attach_function :FPDFPageObj_CreateTextObj, %i[FPDF_DOCUMENT FPDF_FONT float], :FPDF_PAGEOBJECT
attach_function :FPDFText_SetText, %i[FPDF_PAGEOBJECT pointer], :int
attach_function :FPDFPageObj_GetMatrix, %i[FPDF_PAGEOBJECT pointer], :int
attach_function :FPDFPageObj_SetMatrix, %i[FPDF_PAGEOBJECT pointer], :int
attach_function :FPDFPageObj_CreateNewRect, %i[float float float float], :FPDF_PAGEOBJECT
attach_function :FPDFPageObj_SetFillColor, %i[FPDF_PAGEOBJECT uint uint uint uint], :int
attach_function :FPDFPath_SetDrawMode, %i[FPDF_PAGEOBJECT int int], :int
attach_function :FPDFFormObj_CountObjects, [:FPDF_PAGEOBJECT], :int
attach_function :FPDFFormObj_GetObject, %i[FPDF_PAGEOBJECT ulong], :FPDF_PAGEOBJECT
attach_function :FPDFFormObj_RemoveObject, %i[FPDF_PAGEOBJECT FPDF_PAGEOBJECT], :int
attach_function :FPDFPageObj_Transform, %i[FPDF_PAGEOBJECT double double double double double double], :void
attach_function :FPDFImageObj_GetBitmap, [:FPDF_PAGEOBJECT], :FPDF_BITMAP
attach_function :FPDFImageObj_LoadJpegFileInline, %i[pointer int FPDF_PAGEOBJECT pointer], :int
# Page object types
FPDF_PAGEOBJ_UNKNOWN = 0
FPDF_PAGEOBJ_TEXT = 1
FPDF_PAGEOBJ_PATH = 2
FPDF_PAGEOBJ_IMAGE = 3
FPDF_PAGEOBJ_SHADING = 4
FPDF_PAGEOBJ_FORM = 5
# Path segment types
FPDF_SEGMENT_UNKNOWN = -1
FPDF_SEGMENT_LINETO = 0
FPDF_SEGMENT_BEZIERTO = 1
FPDF_SEGMENT_MOVETO = 2
typedef :int, :FPDF_BOOL
typedef :pointer, :IPDF_JSPLATFORM
# rubocop:disable Naming/ClassAndModuleCamelCase
class FPDF_FORMFILLINFO_V2 < FFI::Struct
layout :version, :int,
:Release, :pointer,
:FFI_Invalidate, :pointer,
:FFI_OutputSelectedRect, :pointer,
:FFI_SetCursor, :pointer,
:FFI_SetTimer, :pointer,
:FFI_KillTimer, :pointer,
:FFI_GetLocalTime, :pointer,
:FFI_OnChange, :pointer,
:FFI_GetPage, :pointer,
:FFI_GetCurrentPage, :pointer,
:FFI_GetRotation, :pointer,
:FFI_ExecuteNamedAction, :pointer,
:FFI_SetTextFieldFocus, :pointer,
:FFI_DoURIAction, :pointer,
:FFI_DoGoToAction, :pointer,
:m_pJsPlatform, :IPDF_JSPLATFORM,
:xfa_disabled, :FPDF_BOOL,
:FFI_DisplayCaret, :pointer,
:FFI_GetCurrentPageIndex, :pointer,
:FFI_SetCurrentPage, :pointer,
:FFI_GotoURL, :pointer,
:FFI_GetPageViewRect, :pointer,
:FFI_PageEvent, :pointer,
:FFI_PopupMenu, :pointer,
:FFI_OpenFile, :pointer,
:FFI_EmailTo, :pointer,
:FFI_UploadTo, :pointer,
:FFI_GetPlatform, :pointer,
:FFI_GetLanguage, :pointer,
:FFI_DownloadFromURL, :pointer,
:FFI_PostRequestURL, :pointer,
:FFI_PutRequestURL, :pointer,
:FFI_OnFocusChange, :pointer,
:FFI_DoURIActionWithKeyboardModifier, :pointer
end
# rubocop:enable Naming/ClassAndModuleCamelCase
attach_function :FPDFDOC_InitFormFillEnvironment, %i[FPDF_DOCUMENT pointer], :FPDF_FORMHANDLE
attach_function :FPDFDOC_ExitFormFillEnvironment, [:FPDF_FORMHANDLE], :void
attach_function :FPDF_FFLDraw, %i[FPDF_FORMHANDLE FPDF_BITMAP FPDF_PAGE int int int int int int], :void
attach_function :FPDFPage_Flatten, %i[FPDF_PAGE int], :int
FLAT_NORMALDISPLAY = 0
FLAT_PRINT = 1
FLATTEN_FAIL = 0
FLATTEN_SUCCESS = 1
FLATTEN_NOTHINGTODO = 2
# rubocop:disable Naming/ClassAndModuleCamelCase
class FS_MATRIX < FFI::Struct
layout :a, :float,
:b, :float,
:c, :float,
:d, :float,
:e, :float,
:f, :float
end
# rubocop:enable Naming/ClassAndModuleCamelCase
attach_function :FPDFPage_GetRotation, [:FPDF_PAGE], :int
attach_function :FPDFPage_SetRotation, %i[FPDF_PAGE int], :void
attach_function :FPDFPage_TransFormWithClip, %i[FPDF_PAGE pointer pointer], :int
attach_function :FPDFPage_TransformAnnots, %i[FPDF_PAGE double double double double double double], :void
attach_function :FPDFPage_GetMediaBox, %i[FPDF_PAGE pointer pointer pointer pointer], :int
attach_function :FPDFPage_SetMediaBox, %i[FPDF_PAGE float float float float], :void
attach_function :FPDFPage_GetCropBox, %i[FPDF_PAGE pointer pointer pointer pointer], :int
attach_function :FPDFPage_SetCropBox, %i[FPDF_PAGE float float float float], :void
attach_function :FPDFPage_GetBleedBox, %i[FPDF_PAGE pointer pointer pointer pointer], :int
attach_function :FPDFPage_SetBleedBox, %i[FPDF_PAGE float float float float], :void
attach_function :FPDFPage_GetTrimBox, %i[FPDF_PAGE pointer pointer pointer pointer], :int
attach_function :FPDFPage_SetTrimBox, %i[FPDF_PAGE float float float float], :void
attach_function :FPDFPage_GetArtBox, %i[FPDF_PAGE pointer pointer pointer pointer], :int
attach_function :FPDFPage_SetArtBox, %i[FPDF_PAGE float float float float], :void
PAGE_BOX_ACCESSORS = [
%i[FPDFPage_GetMediaBox FPDFPage_SetMediaBox],
%i[FPDFPage_GetCropBox FPDFPage_SetCropBox],
%i[FPDFPage_GetBleedBox FPDFPage_SetBleedBox],
%i[FPDFPage_GetTrimBox FPDFPage_SetTrimBox],
%i[FPDFPage_GetArtBox FPDFPage_SetArtBox]
].freeze
# rubocop:disable Naming/ClassAndModuleCamelCase
class FPDF_FILEWRITE < FFI::Struct
layout :version, :int,
:WriteBlock, :pointer
end
class FPDF_FILEACCESS < FFI::Struct
layout :m_FileLen, :ulong,
:m_GetBlock, :pointer,
:m_Param, :pointer
end
# rubocop:enable Naming/ClassAndModuleCamelCase
attach_function :FPDF_SaveAsCopy, %i[FPDF_DOCUMENT pointer ulong], :int
FPDF_INCREMENTAL = 1
FPDF_NO_INCREMENTAL = 2
FPDF_REMOVE_SECURITY = 3
attach_function :FPDF_CreateNewDocument, [], :FPDF_DOCUMENT
begin
attach_function :FPDF_ImportPages, %i[FPDF_DOCUMENT FPDF_DOCUMENT string int], :int
rescue FFI::NotFoundError
define_singleton_method(:FPDF_ImportPages) { |*| raise PdfiumError, 'FPDF_ImportPages is not available' } # rubocop:disable Naming/MethodName
end
begin
attach_function :FPDF_RemoveOrphanObjects, [:FPDF_DOCUMENT], :int
rescue FFI::NotFoundError
define_singleton_method(:FPDF_RemoveOrphanObjects) { |*| -1 } # rubocop:disable Naming/MethodName
end
FPDF_ERR_SUCCESS = 0
FPDF_ERR_UNKNOWN = 1
FPDF_ERR_FILE = 2
FPDF_ERR_FORMAT = 3
FPDF_ERR_PASSWORD = 4
FPDF_ERR_SECURITY = 5
FPDF_ERR_PAGE = 6
PDFIUM_ERRORS = {
FPDF_ERR_SUCCESS => 'Success',
FPDF_ERR_UNKNOWN => 'Unknown error',
FPDF_ERR_FILE => 'Error open file',
FPDF_ERR_FORMAT => 'Invalid format',
FPDF_ERR_PASSWORD => 'Incorrect password',
FPDF_ERR_SECURITY => 'Security scheme error',
FPDF_ERR_PAGE => 'Page not found'
}.freeze
class PdfiumError < StandardError; end
def self.error_message(code)
PDFIUM_ERRORS[code] || "Unknown error code: #{code}"
end
def self.with_instance(instance = nil)
yield instance
end
def self.check_last_error(context_message = 'PDFium operation failed')
error_code = FPDF_GetLastError()
return if error_code == FPDF_ERR_SUCCESS
raise PdfiumError, "#{context_message}: #{error_message(error_code)} (Code: #{error_code})"
end
# rubocop:disable Metrics
class Document
attr_reader :document_ptr, :form_handle
def initialize(document_ptr, source_buffer = nil)
raise ArgumentError, 'document_ptr cannot be nil' if document_ptr.nil? || document_ptr.null?
@document_ptr = document_ptr
@pages = {}
@closed = false
@source_buffer = source_buffer
@form_handle = FFI::Pointer::NULL
@form_fill_info_mem = FFI::Pointer::NULL
@presave_hooks = {}
init_form_fill_environment
end
def init_form_fill_environment
return if @document_ptr.null?
@form_fill_info_mem = FFI::MemoryPointer.new(FPDF_FORMFILLINFO_V2.size)
form_fill_info_struct = FPDF_FORMFILLINFO_V2.new(@form_fill_info_mem)
form_fill_info_struct[:version] = 2
@form_handle = Pdfium.FPDFDOC_InitFormFillEnvironment(@document_ptr, @form_fill_info_mem)
end
def page_count
@page_count ||= Pdfium.FPDF_GetPageCount(@document_ptr)
end
def import_pages(src_doc, pages: nil, index: nil)
ensure_not_closed!
result = Pdfium.FPDF_ImportPages(@document_ptr, src_doc.document_ptr, pages, index || page_count)
raise PdfiumError, 'Failed to import pages' if result.zero?
@page_count = nil
result
end
def self.create
doc_ptr = Pdfium.FPDF_CreateNewDocument()
if doc_ptr.null?
Pdfium.check_last_error('Failed to create new document')
raise PdfiumError, 'Failed to create new document'
end
doc = new(doc_ptr)
return doc unless block_given?
begin
yield doc
ensure
doc.close
end
end
def self.open_file(file_path, password = nil)
doc_ptr = Pdfium.FPDF_LoadDocument(file_path, password)
if doc_ptr.null?
Pdfium.check_last_error("Failed to load document from file '#{file_path}'")
raise PdfiumError, "Failed to load document from file '#{file_path}', pointer is NULL."
end
doc = new(doc_ptr)
return doc unless block_given?
begin
yield doc
ensure
doc.close
end
end
def self.open_bytes(bytes, password = nil)
buffer = FFI::MemoryPointer.new(:char, bytes.bytesize)
buffer.put_bytes(0, bytes)
doc_ptr = Pdfium.FPDF_LoadMemDocument(buffer, bytes.bytesize, password)
if doc_ptr.null?
Pdfium.check_last_error('Failed to load document from memory')
raise PdfiumError, 'Failed to load document from memory, pointer is NULL.'
end
doc = new(doc_ptr, buffer)
return doc unless block_given?
begin
yield doc
ensure
doc.close
end
end
def closed?
@closed
end
def ensure_not_closed!
raise PdfiumError, 'Document is closed.' if closed?
end
def get_page(page_index)
ensure_not_closed!
unless page_index.is_a?(Integer) && page_index >= 0 && page_index < page_count
raise PdfiumError, "Page index #{page_index} out of range (0..#{page_count - 1})"
end
@pages[page_index] ||= Page.new(self, page_index)
end
def save(io, flags: Pdfium::FPDF_NO_INCREMENTAL)
ensure_not_closed!
run_presave_hooks
file_write_mem = FFI::MemoryPointer.new(FPDF_FILEWRITE.size)
file_write_struct = FPDF_FILEWRITE.new(file_write_mem)
file_write_struct[:version] = 1
file_write_struct[:WriteBlock] = FFI::Function.new(:int, %i[pointer pointer ulong]) do |_, data, size|
io.write(data.read_bytes(size))
1
end
result = Pdfium.FPDF_SaveAsCopy(@document_ptr, file_write_mem, flags)
if result.zero?
Pdfium.check_last_error('Failed to save document')
raise PdfiumError, 'Failed to save document'
end
io
end
def cleanup
ensure_not_closed!
Pdfium.FPDF_RemoveOrphanObjects(@document_ptr)
end
def standard_font
@standard_font ||= Pdfium.FPDFText_LoadStandardFont(@document_ptr, 'Helvetica')
end
def add_presave_hook(key, &block)
@presave_hooks[key] ||= block
end
def run_presave_hooks
@presave_hooks.each_value(&:call)
end
def close
return if closed?
@pages.each_value { |page| page.close unless page.closed? }
@pages.clear
unless @form_handle.null?
Pdfium.FPDFDOC_ExitFormFillEnvironment(@form_handle)
@form_handle = FFI::Pointer::NULL
end
if @form_fill_info_mem && !@form_fill_info_mem.null?
@form_fill_info_mem.free
@form_fill_info_mem = FFI::Pointer::NULL
end
Pdfium.FPDF_CloseDocument(@document_ptr) unless @document_ptr.null?
@document_ptr = FFI::Pointer::NULL
@source_buffer = nil
@closed = true
end
end
class Page
attr_reader :document, :page_index, :page_ptr
def initialize(document, page_index)
raise ArgumentError, 'Document object is required' unless document.is_a?(Pdfium::Document)
@document = document
@document.ensure_not_closed!
@page_index = page_index
@page_ptr = Pdfium.FPDF_LoadPage(document.document_ptr, page_index)
if @page_ptr.null?
Pdfium.check_last_error("Failed to load page #{page_index}")
raise PdfiumError, "Failed to load page #{page_index}, pointer is NULL."
end
@closed = false
end
def width
@width ||= Pdfium.FPDF_GetPageWidthF(@page_ptr)
end
def height
@height ||= Pdfium.FPDF_GetPageHeightF(@page_ptr)
end
def rotation
@rotation ||= Pdfium.FPDFPage_GetRotation(@page_ptr)
end
def rotation=(value)
Pdfium.FPDFPage_SetRotation(@page_ptr, value)
@rotation = value
end
def closed?
@closed
end
delegate :form_handle, to: :@document
def ensure_not_closed!
raise PdfiumError, 'Page is closed.' if closed?
@document.ensure_not_closed!
end
def render_to_bitmap(width: nil, height: nil, scale: nil, background_color: 0xFFFFFFFF,
flags: FPDF_ANNOT | FPDF_LCD_TEXT | FPDF_NO_NATIVETEXT | FPDF_REVERSE_BYTE_ORDER)
ensure_not_closed!
render_width, render_height = calculate_render_dimensions(width, height, scale)
bitmap_ptr = Pdfium.FPDFBitmap_Create(render_width, render_height, 1)
if bitmap_ptr.null?
Pdfium.check_last_error('Failed to create bitmap (potential pre-existing error)')
raise PdfiumError, 'Failed to create bitmap (FPDFBitmap_Create returned NULL)'
end
Pdfium.FPDFBitmap_FillRect(bitmap_ptr, 0, 0, render_width, render_height, background_color)
Pdfium.FPDF_RenderPageBitmap(bitmap_ptr, page_ptr, 0, 0, render_width, render_height, 0, flags)
unless form_handle.null?
Pdfium.FPDF_FFLDraw(form_handle, bitmap_ptr, page_ptr, 0, 0, render_width, render_height, 0, flags)
end
buffer_ptr = Pdfium.FPDFBitmap_GetBuffer(bitmap_ptr)
stride = Pdfium.FPDFBitmap_GetStride(bitmap_ptr)
bitmap_data = buffer_ptr.read_bytes(stride * render_height)
[bitmap_data, render_width, render_height]
ensure
Pdfium.FPDFBitmap_Destroy(bitmap_ptr) if bitmap_ptr && !bitmap_ptr.null?
end
def text
return @text if @text
ensure_not_closed!
text_page = Pdfium.FPDFText_LoadPage(page_ptr)
if text_page.null?
Pdfium.check_last_error("Failed to load text page #{page_index}")
raise PdfiumError, "Failed to load text page #{page_index}, pointer is NULL."
end
char_count = Pdfium.FPDFText_CountChars(text_page)
return @text = '' if char_count.zero?
buffer_char_capacity = char_count + 1
buffer = FFI::MemoryPointer.new(:uint16, buffer_char_capacity)
chars_written = Pdfium.FPDFText_GetText(text_page, 0, buffer_char_capacity, buffer)
if chars_written <= 0
Pdfium.check_last_error("Failed to extract text from page #{page_index}")
return @text = ''
end
@text = buffer.read_bytes((chars_written * 2) - 2).force_encoding('UTF-16LE').encode('UTF-8')
ensure
Pdfium.FPDFText_ClosePage(text_page) if text_page && !text_page.null?
end
def text_nodes
return @text_nodes if @text_nodes
text_page = Pdfium.FPDFText_LoadPage(page_ptr)
char_count = Pdfium.FPDFText_CountChars(text_page)
@text_nodes = []
return @text_nodes if char_count.zero?
loose_rect_ptr = FFI::MemoryPointer.new(:float, 4)
i = 0
loop do
break unless i < char_count
box_index = i
codepoint = Pdfium.FPDFText_GetUnicode(text_page, i)
if codepoint.between?(0xD800, 0xDBFF) && (i + 1 < char_count)
codepoint2 = Pdfium.FPDFText_GetUnicode(text_page, i + 1)
if codepoint2.between?(0xDC00, 0xDFFF)
codepoint = 0x10000 + ((codepoint - 0xD800) << 10) + (codepoint2 - 0xDC00)
i += 1
end
end
char = codepoint.chr(Encoding::UTF_8)
next if Pdfium.FPDFText_GetLooseCharBox(text_page, box_index, loose_rect_ptr).zero?
loose_left, loose_top, loose_right, loose_bottom = loose_rect_ptr.read_array_of_float(4)
next if loose_right <= loose_left || loose_top <= loose_bottom
x = loose_left / width
y = (height - loose_top) / height
node_width = (loose_right - loose_left) / width
node_height = (loose_top - loose_bottom) / height
@text_nodes << TextNode.new(char, x, y, node_width, node_height)
ensure
i += 1
end
y_threshold = 4.0 / width
@text_nodes = @text_nodes.sort do |a, b|
(a.endy - b.endy).abs < y_threshold ? a.x <=> b.x : a.endy <=> b.endy
end
ensure
Pdfium.FPDFText_ClosePage(text_page) if text_page && !text_page.null?
end
def redact(rects, &image_processor)
ensure_not_closed!
flatten
rotate
rect_bounds = rects.map do |rect|
left = rect['x'].to_f * width
top = height - (rect['y'].to_f * height)
[left, top - (rect['h'].to_f * height), left + (rect['w'].to_f * width), top]
end
unwrap_form_objects(rect_bounds)
remove_redacted_chars(rect_bounds)
redact_image_objects(rect_bounds, &image_processor) if image_processor
draw_redaction_rects(rect_bounds)
raise PdfiumError, 'Failed to generate page content' if Pdfium.FPDFPage_GenerateContent(@page_ptr).zero?
remove_blank_text_objects
@document.add_presave_hook(:cleanup) { @document.cleanup }
reset_text_memoization
nil
end
def remove_blank_text_objects
text_page = Pdfium.FPDFText_LoadPage(@page_ptr)
return if text_page.null?
blanks = []
begin
Pdfium.FPDFPage_CountObjects(@page_ptr).times do |index|
object_ptr = Pdfium.FPDFPage_GetObject(@page_ptr, index)
next if object_ptr.null?
next unless Pdfium.FPDFPageObj_GetType(object_ptr) == Pdfium::FPDF_PAGEOBJ_TEXT
needed_bytes = Pdfium.FPDFTextObj_GetText(object_ptr, text_page, FFI::Pointer::NULL, 0)
next if needed_bytes < 2
buffer = FFI::MemoryPointer.new(:uint8, needed_bytes)
written = Pdfium.FPDFTextObj_GetText(object_ptr, text_page, buffer, needed_bytes)
next if written < 2
content = buffer.read_bytes(written - 2).force_encoding('UTF-16LE').encode('UTF-8')
blanks << object_ptr if content.codepoints.all? { |code| BLANK_TEXT_CODEPOINTS.include?(code) }
end
ensure
Pdfium.FPDFText_ClosePage(text_page)
end
return if blanks.empty?
blanks.each { |object_ptr| remove_page_object(object_ptr) }
Pdfium.FPDFPage_GenerateContent(@page_ptr)
end
def remove_redacted_chars(rect_bounds)
text_page = Pdfium.FPDFText_LoadPage(@page_ptr)
raise PdfiumError, 'Failed to load text page' if text_page.null?
begin
text_objects_chars = collect_text_objects_chars(text_page, rect_bounds)
ensure
Pdfium.FPDFText_ClosePage(text_page)
end
text_objects_chars.each_value do |entry|
next if entry[:chars].none? { |char| char[:redacted] }
rebuild_text_object_survivors(entry) unless entry[:chars].all? { |char| char[:redacted] }
remove_page_object(entry[:ptr])
end
end
def unwrap_form_objects(rect_bounds = nil)
unwrapped = false
matrix_ptr = FFI::MemoryPointer.new(:float, 6)
loop do
form_ptr = find_form_object(rect_bounds)
break if form_ptr.nil?
unwrapped = true
matrix =
if Pdfium.FPDFPageObj_GetMatrix(form_ptr, matrix_ptr).zero?
[1.0, 0.0, 0.0, 1.0, 0.0, 0.0]
else
matrix_ptr.read_array_of_float(6)
end
(Pdfium.FPDFFormObj_CountObjects(form_ptr) - 1).downto(0) do |index|
child_ptr = Pdfium.FPDFFormObj_GetObject(form_ptr, index)
next if child_ptr.null?
raise PdfiumError, 'Failed to unwrap form object' if Pdfium.FPDFFormObj_RemoveObject(form_ptr,
child_ptr).zero?
Pdfium.FPDFPageObj_Transform(child_ptr, *matrix)
Pdfium.FPDFPage_InsertObject(@page_ptr, child_ptr)
end
remove_page_object(form_ptr)
end
Pdfium.FPDFPage_GenerateContent(@page_ptr) if unwrapped
reset_text_memoization if unwrapped
end
def find_form_object(rect_bounds = nil)
bounds_ptrs = Array.new(4) { FFI::MemoryPointer.new(:float) }
Pdfium.FPDFPage_CountObjects(@page_ptr).times do |index|
object_ptr = Pdfium.FPDFPage_GetObject(@page_ptr, index)
next if object_ptr.null?
next unless Pdfium.FPDFPageObj_GetType(object_ptr) == FPDF_PAGEOBJ_FORM
return object_ptr if rect_bounds.nil?
next if Pdfium.FPDFPageObj_GetBounds(object_ptr, *bounds_ptrs).zero?
left, bottom, right, top = bounds_ptrs.map(&:read_float)
intersects = rect_bounds.any? do |rl, rb, rr, rt|
left < rr && right > rl && bottom < rt && top > rb
end
return object_ptr if intersects
end
nil
end
def collect_text_objects_chars(text_page, rect_bounds)
char_count = Pdfium.FPDFText_CountChars(text_page)
left_ptr, right_ptr, bottom_ptr, top_ptr, origin_x_ptr, origin_y_ptr =
Array.new(6) { FFI::MemoryPointer.new(:double) }
text_objects_chars = {}
index = 0
while index < char_count
object_ptr = Pdfium.FPDFText_GetTextObject(text_page, index)
codepoint = Pdfium.FPDFText_GetUnicode(text_page, index)
box_index = index
if codepoint.between?(0xD800, 0xDBFF) && (index + 1 < char_count)
codepoint2 = Pdfium.FPDFText_GetUnicode(text_page, index + 1)
if codepoint2.between?(0xDC00, 0xDFFF)
codepoint = 0x10000 + ((codepoint - 0xD800) << 10) + (codepoint2 - 0xDC00)
index += 1
end
end
index += 1
next if object_ptr.null?
next if Pdfium.FPDFText_GetCharBox(text_page, box_index, left_ptr, right_ptr, bottom_ptr, top_ptr).zero?
center_x = (left_ptr.read_double + right_ptr.read_double) / 2.0
center_y = (bottom_ptr.read_double + top_ptr.read_double) / 2.0
Pdfium.FPDFText_GetCharOrigin(text_page, box_index, origin_x_ptr, origin_y_ptr)
entry = text_objects_chars[object_ptr.address] ||= { ptr: object_ptr, chars: [] }
entry[:chars] << {
codepoint:,
origin_x: origin_x_ptr.read_double,
origin_y: origin_y_ptr.read_double,
redacted: rect_bounds.any? do |left, bottom, right, top|
center_x.between?(left, right) && center_y.between?(bottom, top)
end
}
end
text_objects_chars
end
def rebuild_text_object_survivors(entry)
font_ptr = @document.standard_font
font_size_ptr = FFI::MemoryPointer.new(:float)
font_size = Pdfium.FPDFTextObj_GetFontSize(entry[:ptr], font_size_ptr).zero? ? 12.0 : font_size_ptr.read_float
matrix_ptr = FFI::MemoryPointer.new(:float, 6)
matrix =
if Pdfium.FPDFPageObj_GetMatrix(entry[:ptr], matrix_ptr).zero?
[1.0, 0.0, 0.0, 1.0, 0.0, 0.0]
else
matrix_ptr.read_array_of_float(6)
end
entry[:chars].reject { |char| char[:redacted] }.each do |char|
new_object = Pdfium.FPDFPageObj_CreateTextObj(@document.document_ptr, font_ptr, font_size)
next if new_object.null?
text_data = [char[:codepoint]].pack('U').encode(Encoding::UTF_16LE).b + "\x00\x00".b
text_buffer = FFI::MemoryPointer.new(:char, text_data.bytesize)
text_buffer.put_bytes(0, text_data)
if Pdfium.FPDFText_SetText(new_object, text_buffer).zero?
Pdfium.FPDFPageObj_Destroy(new_object)
next
end
matrix_ptr.write_array_of_float([matrix[0], matrix[1], matrix[2], matrix[3],
char[:origin_x], char[:origin_y]])
Pdfium.FPDFPageObj_SetMatrix(new_object, matrix_ptr)
Pdfium.FPDFPage_InsertObject(@page_ptr, new_object)
end
end
def reset_text_memoization
remove_instance_variable(:@text) if defined?(@text)
@text_nodes = nil
@text_objects = nil
@line_nodes = nil
end
def remove_page_object(object_ptr)
raise PdfiumError, 'Failed to remove page object' if Pdfium.FPDFPage_RemoveObject(@page_ptr, object_ptr).zero?
Pdfium.FPDFPageObj_Destroy(object_ptr)
end
def draw_redaction_rects(rect_bounds)
rect_bounds.each do |left, bottom, right, top|
rect_object = Pdfium.FPDFPageObj_CreateNewRect(left, bottom, right - left, top - bottom)
raise PdfiumError, 'Failed to create redaction rect' if rect_object.null?
Pdfium.FPDFPageObj_SetFillColor(rect_object, 0, 0, 0, 255)
Pdfium.FPDFPath_SetDrawMode(rect_object, 1, 0)
Pdfium.FPDFPage_InsertObject(@page_ptr, rect_object)
end
end
def redact_image_objects(rect_bounds)
bounds_ptrs = Array.new(4) { FFI::MemoryPointer.new(:float) }
matrix_ptr = FFI::MemoryPointer.new(:float, 6)
Pdfium.FPDFPage_CountObjects(@page_ptr).times do |index|
object_ptr = Pdfium.FPDFPage_GetObject(@page_ptr, index)
next if object_ptr.null?
next unless Pdfium.FPDFPageObj_GetType(object_ptr) == FPDF_PAGEOBJ_IMAGE
next if Pdfium.FPDFPageObj_GetBounds(object_ptr, *bounds_ptrs).zero?
obj_left, obj_bottom, obj_right, obj_top = bounds_ptrs.map(&:read_float)
overlapping = rect_bounds.select do |left, bottom, right, top|
obj_left < right && obj_right > left && obj_bottom < top && obj_top > bottom
end
next if overlapping.empty?
raise PdfiumError, 'Failed to get image matrix' if Pdfium.FPDFPageObj_GetMatrix(object_ptr, matrix_ptr).zero?
matrix = matrix_ptr.read_array_of_float(6)
next if ((matrix[0] * matrix[3]) - (matrix[1] * matrix[2])).abs < 1e-9
bitmap = extract_image_bitmap(object_ptr)
pixel_rects = image_pixel_rects(matrix, bitmap[:width], bitmap[:height], overlapping)
next if pixel_rects.empty?
jpeg = yield(bitmap, pixel_rects)
load_image_jpeg(object_ptr, jpeg) if jpeg
end
end
def extract_image_bitmap(object_ptr)
bitmap_ptr = Pdfium.FPDFImageObj_GetBitmap(object_ptr)
raise PdfiumError, 'Failed to get image bitmap' if bitmap_ptr.nil? || bitmap_ptr.null?
format, bands = BITMAP_FORMAT_BANDS[Pdfium.FPDFBitmap_GetFormat(bitmap_ptr)]
raise PdfiumError, 'Unsupported image bitmap format' if format.nil?
image_width = Pdfium.FPDFBitmap_GetWidth(bitmap_ptr)
image_height = Pdfium.FPDFBitmap_GetHeight(bitmap_ptr)
stride = Pdfium.FPDFBitmap_GetStride(bitmap_ptr)
data = Pdfium.FPDFBitmap_GetBuffer(bitmap_ptr).read_bytes(stride * image_height)
row_size = image_width * bands
data = Array.new(image_height) { |row| data.byteslice(row * stride, row_size) }.join if stride != row_size
{ data:, width: image_width, height: image_height, bands:, format: }
ensure
Pdfium.FPDFBitmap_Destroy(bitmap_ptr) if bitmap_ptr && !bitmap_ptr.null?
end
def image_pixel_rects(matrix, image_width, image_height, rect_bounds)
a, b, c, d, e, f = matrix
det = (a * d) - (b * c)
rect_bounds.filter_map do |left, bottom, right, top|
corners = [[left, bottom], [right, bottom], [left, top], [right, top]].map do |x, y|
u = ((d * (x - e)) - (c * (y - f))) / det
v = ((a * (y - f)) - (b * (x - e))) / det
[u * image_width, (1 - v) * image_height]
end
xs = corners.map(&:first)
ys = corners.map(&:last)
next if xs.max <= 0 || xs.min >= image_width || ys.max <= 0 || ys.min >= image_height
px_left = xs.min.floor.clamp(0, image_width - 1)
px_top = ys.min.floor.clamp(0, image_height - 1)
[px_left, px_top,
(xs.max.ceil - px_left).clamp(1, image_width - px_left),
(ys.max.ceil - px_top).clamp(1, image_height - px_top)]
end
end
def load_image_jpeg(object_ptr, jpeg)
get_block = FFI::Function.new(:int, %i[pointer ulong pointer ulong]) do |_param, position, out, size|
out.put_bytes(0, jpeg.byteslice(position, size) || ''.b)
1
end
file_access = Pdfium::FPDF_FILEACCESS.new
file_access[:m_FileLen] = jpeg.bytesize
file_access[:m_GetBlock] = get_block
file_access[:m_Param] = FFI::Pointer::NULL
pages_ptr = FFI::MemoryPointer.new(:pointer, 1)
pages_ptr.write_pointer(@page_ptr)
result = Pdfium.FPDFImageObj_LoadJpegFileInline(pages_ptr, 1, object_ptr, file_access)
raise PdfiumError, 'Failed to load redacted image' if result.zero?
end
def text_objects
return @text_objects if @text_objects
ensure_not_closed!
@text_objects = []
object_count = Pdfium.FPDFPage_CountObjects(page_ptr)
return @text_objects if object_count.zero?
text_page = Pdfium.FPDFText_LoadPage(page_ptr)
if text_page.null?
Pdfium.check_last_error("Failed to load text page #{page_index}")
raise PdfiumError, "Failed to load text page #{page_index}, pointer is NULL."
end
left_ptr = FFI::MemoryPointer.new(:float)
bottom_ptr = FFI::MemoryPointer.new(:float)
right_ptr = FFI::MemoryPointer.new(:float)
top_ptr = FFI::MemoryPointer.new(:float)
font_size_ptr = FFI::MemoryPointer.new(:float)
object_count.times do |i|
page_object = Pdfium.FPDFPage_GetObject(page_ptr, i)
next if page_object.null?
next unless Pdfium.FPDFPageObj_GetType(page_object) == Pdfium::FPDF_PAGEOBJ_TEXT
needed_bytes = Pdfium.FPDFTextObj_GetText(page_object, text_page, FFI::Pointer::NULL, 0)
next if needed_bytes < 4
buffer = FFI::MemoryPointer.new(:uint8, needed_bytes)
written = Pdfium.FPDFTextObj_GetText(page_object, text_page, buffer, needed_bytes)
next if written < 4
content = buffer.read_bytes(written - 2).force_encoding('UTF-16LE').encode('UTF-8')
next if content.empty?
next if Pdfium.FPDFPageObj_GetBounds(page_object, left_ptr, bottom_ptr, right_ptr, top_ptr).zero?
obj_left = left_ptr.read_float
obj_bottom = bottom_ptr.read_float
obj_right = right_ptr.read_float
obj_top = top_ptr.read_float
obj_width = obj_right - obj_left
obj_height = obj_top - obj_bottom
next if obj_width <= 0 || obj_height <= 0
font_size =
if Pdfium.FPDFTextObj_GetFontSize(page_object, font_size_ptr) == 0
obj_height
else
font_size_ptr.read_float
end
font_size = 8 if font_size == 1
norm_x = obj_left / width
norm_y = (height - obj_top) / height
norm_w = obj_width / width
norm_h = obj_height / height
@text_objects << TextObject.new(content, norm_x, norm_y, norm_w, norm_h, font_size)
end
y_threshold = 4.0 / width
@text_objects = @text_objects.sort do |a, b|
(a.endy - b.endy).abs < y_threshold ? a.x <=> b.x : a.endy <=> b.endy
end
ensure
Pdfium.FPDFText_ClosePage(text_page) if text_page && !text_page.null?
end
def line_nodes
return @line_nodes if @line_nodes
ensure_not_closed!
@line_nodes = []
object_count = Pdfium.FPDFPage_CountObjects(page_ptr)
return @line_nodes if object_count.zero?
object_count.times do |i|
page_object = Pdfium.FPDFPage_GetObject(page_ptr, i)
next if page_object.null?
obj_type = Pdfium.FPDFPageObj_GetType(page_object)
next unless obj_type == Pdfium::FPDF_PAGEOBJ_PATH
left_ptr = FFI::MemoryPointer.new(:float)
bottom_ptr = FFI::MemoryPointer.new(:float)
right_ptr = FFI::MemoryPointer.new(:float)
top_ptr = FFI::MemoryPointer.new(:float)
Pdfium.FPDFPageObj_GetBounds(page_object, left_ptr, bottom_ptr, right_ptr, top_ptr)
obj_left = left_ptr.read_float
obj_bottom = bottom_ptr.read_float
obj_right = right_ptr.read_float
obj_top = top_ptr.read_float
obj_width = obj_right - obj_left
obj_height = obj_top - obj_bottom
next if obj_width < 1 && obj_height < 1
segment_count = Pdfium.FPDFPath_CountSegments(page_object)
next if segment_count < 2
next unless segment_count <= 10 && (obj_height < 10 || obj_width < 10)
if obj_width > obj_height && obj_height < 10
tilt = 0
elsif obj_height > obj_width && obj_width < 10
tilt = 90
else
next
end
x = obj_left
y = obj_bottom
w = obj_width
h = obj_height
norm_x = x / width
norm_y = (height - y - h) / height
norm_w = w / width
norm_h = h / height
@line_nodes << LineNode.new(norm_x, norm_y, norm_w, norm_h, tilt)
end
@line_nodes = @line_nodes.sort { |a, b| a.endy == b.endy ? a.x <=> b.x : a.endy <=> b.endy }
end
def image_nodes
ensure_not_closed!
nodes = []
bounds_ptrs = Array.new(4) { FFI::MemoryPointer.new(:float) }
Pdfium.FPDFPage_CountObjects(@page_ptr).times do |index|
object_ptr = Pdfium.FPDFPage_GetObject(@page_ptr, index)
next if object_ptr.null?
next unless Pdfium.FPDFPageObj_GetType(object_ptr) == FPDF_PAGEOBJ_IMAGE
next if Pdfium.FPDFPageObj_GetBounds(object_ptr, *bounds_ptrs).zero?
obj_left, obj_bottom, obj_right, obj_top = bounds_ptrs.map(&:read_float)
left = (obj_left / width).clamp(0, 1)
top = ((height - obj_top) / height).clamp(0, 1)
right = (obj_right / width).clamp(0, 1)
bottom = ((height - obj_bottom) / height).clamp(0, 1)
next if right - left <= 0 || bottom - top <= 0
nodes << ImageNode.new(left, top, right - left, bottom - top)
end
nodes
end
def rotate
ensure_not_closed!
rotation = Pdfium.FPDFPage_GetRotation(page_ptr)
return false if rotation.zero?
l_ptr = FFI::MemoryPointer.new(:float)
b_ptr = FFI::MemoryPointer.new(:float)
r_ptr = FFI::MemoryPointer.new(:float)
t_ptr = FFI::MemoryPointer.new(:float)
has_crop = !Pdfium.FPDFPage_GetCropBox(page_ptr, l_ptr, b_ptr, r_ptr, t_ptr).zero?
Pdfium.FPDFPage_GetMediaBox(page_ptr, l_ptr, b_ptr, r_ptr, t_ptr) unless has_crop
pl = l_ptr.read_float
pb = b_ptr.read_float
pr = r_ptr.read_float
pt = t_ptr.read_float
a, b, c, d, e, f =
case rotation
when 1 then [0, -1, 1, 0, -pb, pr]
when 2 then [-1, 0, 0, -1, pr, pt]
when 3 then [0, 1, -1, 0, pt, -pl]
end
Pdfium::PAGE_BOX_ACCESSORS.each do |getter, setter|
next if Pdfium.public_send(getter, page_ptr, l_ptr, b_ptr, r_ptr, t_ptr).zero?
bl = l_ptr.read_float
bb = b_ptr.read_float
br = r_ptr.read_float
bt = t_ptr.read_float
c1x, c1y, c2x, c2y =
case rotation
when 1 then [br, bb, bl, bt]
when 2 then [br, bt, bl, bb]
when 3 then [bl, bt, br, bb]
end
new_llx = (a * c1x) + (c * c1y) + e
new_lly = (b * c1x) + (d * c1y) + f
new_urx = (a * c2x) + (c * c2y) + e
new_ury = (b * c2x) + (d * c2y) + f
Pdfium.public_send(setter, page_ptr, new_llx, new_lly, new_urx, new_ury)
end
Pdfium.FPDFPage_TransformAnnots(page_ptr, a, b, c, d, e, f)
matrix_ptr = FFI::MemoryPointer.new(FS_MATRIX.size)
matrix_struct = FS_MATRIX.new(matrix_ptr)
matrix_struct[:a] = a
matrix_struct[:b] = b
matrix_struct[:c] = c
matrix_struct[:d] = d
matrix_struct[:e] = e
matrix_struct[:f] = f
Pdfium.FPDFPage_TransFormWithClip(page_ptr, matrix_ptr, FFI::Pointer::NULL)
Pdfium.FPDFPage_SetRotation(page_ptr, 0)
reload
true
end
def flatten(flag = Pdfium::FLAT_NORMALDISPLAY)
ensure_not_closed!
result = Pdfium.FPDFPage_Flatten(page_ptr, flag)
if result == Pdfium::FLATTEN_FAIL
Pdfium.check_last_error("Failed to flatten page #{page_index}")
raise PdfiumError, "Failed to flatten page #{page_index}"
end
reload if result == Pdfium::FLATTEN_SUCCESS
result
end
def reload
Pdfium.FPDF_ClosePage(@page_ptr)
@page_ptr = Pdfium.FPDF_LoadPage(@document.document_ptr, @page_index)
raise PdfiumError, "Failed to reload page #{page_index}" if @page_ptr.null?
@rotation = nil
@width = nil
@height = nil
reset_text_memoization
end
def close
return if closed?
Pdfium.FPDF_ClosePage(@page_ptr) unless @page_ptr.null?
@page_ptr = FFI::Pointer::NULL
@closed = true
end
private
def calculate_render_dimensions(width_param, height_param, scale_param)
if scale_param
render_width = (width * scale_param).round
render_height = (height * scale_param).round
elsif width_param || height_param
if width_param && height_param
render_width = width_param
render_height = height_param
elsif width_param
scale_factor = width_param.to_f / width
render_width = width_param
render_height = (height * scale_factor).round
else
scale_factor = height_param.to_f / height
render_width = (width * scale_factor).round
render_height = height_param
end
else
render_width = width.to_i
render_height = height.to_i
end
[render_width.clamp(1, MAX_SIZE), render_height.clamp(1, MAX_SIZE)]
end
end
def self.initialize_library
config_mem = FFI::MemoryPointer.new(FPDF_LIBRARY_CONFIG.size)
config_struct = FPDF_LIBRARY_CONFIG.new(config_mem)
config_struct[:version] = 2
config_struct[:m_pUserFontPaths] = FFI::Pointer::NULL
config_struct[:m_pIsolate] = FFI::Pointer::NULL
config_struct[:m_v8EmbedderSlot] = 0
FPDF_InitLibraryWithConfig(config_mem)
end
def self.cleanup_library
FPDF_DestroyLibrary()
end
initialize_library
at_exit do
cleanup_library
end
# rubocop:enable Metrics
end
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