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Name	Size	Permission
document	[ DIR ]	drwxr-xr-x
font	[ DIR ]	drwxr-xr-x
graphics	[ DIR ]	drwxr-xr-x
images	[ DIR ]	drwxr-xr-x
security	[ DIR ]	drwxr-xr-x
table	[ DIR ]	drwxr-xr-x
text	[ DIR ]	drwxr-xr-x
document.rb	23.32 KB	-rw-r--r--
encoding.rb	2.61 KB	-rw-r--r--
errors.rb	2.92 KB	-rw-r--r--
font.rb	13.46 KB	-rw-r--r--
font_metric_cache.rb	1.06 KB	-rw-r--r--
graphics.rb	19.4 KB	-rw-r--r--
grid.rb	6.44 KB	-rw-r--r--
image_handler.rb	896 B	-rw-r--r--
images.rb	6.42 KB	-rw-r--r--
measurement_extensions.rb	671 B	-rw-r--r--
measurements.rb	995 B	-rw-r--r--
outline.rb	11.32 KB	-rw-r--r--
repeater.rb	3.26 KB	-rw-r--r--
security.rb	10.4 KB	-rw-r--r--
soft_mask.rb	2.09 KB	-rw-r--r--
stamp.rb	4.43 KB	-rw-r--r--
table.rb	24.46 KB	-rw-r--r--
text.rb	16.76 KB	-rw-r--r--
transformation_stack.rb	1.13 KB	-rw-r--r--
utilities.rb	998 B	-rw-r--r--
version.rb	44 B	-rw-r--r--
view.rb	2.56 KB	-rw-r--r--

Code Editor : images.rb

# encoding: ASCII-8BIT
# images.rb : Implements PDF image embedding
#
# Copyright April 2008, James Healy, Gregory Brown.  All Rights Reserved.
#
# This is free software. Please see the LICENSE and COPYING files for details.

require 'digest/sha1'
require 'pathname'

module Prawn
  module Images
    # @group Stable API

# Add the image at filename to the current page. Currently only
    # JPG and PNG files are supported. (Note that processing PNG
    # images with alpha channels can be processor and memory intensive.)
    #
    # Arguments:
    # <tt>file</tt>:: path to file or an object that responds to #read and
    #   #rewind
    #
    # Options:
    # <tt>:at</tt>:: an array [x,y] with the location of the top left corner of
    #   the image.
    # <tt>:position</tt>::  One of (:left, :center, :right) or an x-offset
    # <tt>:vposition</tt>::  One of (:top, :center, :bottom) or an y-offset
    # <tt>:height</tt>:: the height of the image [actual height of the image]
    # <tt>:width</tt>:: the width of the image [actual width of the image]
    # <tt>:scale</tt>:: scale the dimensions of the image proportionally
    # <tt>:fit</tt>:: scale the dimensions of the image proportionally to fit
    #   inside [width,height]
    #
    #   Prawn::Document.generate("image2.pdf", :page_layout => :landscape) do
    #     pigs = "#{Prawn::DATADIR}/images/pigs.jpg"
    #     image pigs, :at => [50,450], :width => 450
    #
    #     dice = "#{Prawn::DATADIR}/images/dice.png"
    #     image dice, :at => [50, 450], :scale => 0.75
    #   end
    #
    # If only one of :width / :height are provided, the image will be scaled
    # proportionally.  When both are provided, the image will be stretched to
    # fit the dimensions without maintaining the aspect ratio.
    #
    #
    # If :at is provided, the image will be place in the current page but
    # the text position will not be changed.
    #
    #
    # If instead of an explicit filename, an object with a read method is
    # passed as +file+, you can embed images from IO objects and things
    # that act like them (including Tempfiles and open-uri objects).
    #
    #   require "open-uri"
    #
    #   Prawn::Document.generate("remote_images.pdf") do
    #     image open("http://prawnpdf.org/media/prawn_logo.png")
    #   end
    #
    # This method returns an image info object which can be used to check the
    # dimensions of an image object if needed.
    # (See also: Prawn::Images::PNG , Prawn::Images::JPG)
    #
    def image(file, options = {})
      Prawn.verify_options [
        :at, :position, :vposition, :height,
        :width, :scale, :fit
      ], options

pdf_obj, info = build_image_object(file)
      embed_image(pdf_obj, info, options)

info
    end

# Builds an info object (Prawn::Images::*) and a PDF reference representing
    # the given image. Return a pair: [pdf_obj, info].
    #
    # @private
    def build_image_object(file)
      io = verify_and_open_image(file)
      image_content = io.read
      image_sha1 = Digest::SHA1.hexdigest(image_content)

# if this image has already been embedded, just reuse it
      if image_registry[image_sha1]
        info = image_registry[image_sha1][:info]
        image_obj = image_registry[image_sha1][:obj]
      else
        # Build the image object
        info = Prawn.image_handler.find(image_content).new(image_content)

# Bump PDF version if the image requires it
        if info.respond_to?(:min_pdf_version)
          renderer.min_version(info.min_pdf_version)
        end

# Add the image to the PDF and register it in case we see it again.
        image_obj = info.build_pdf_object(self)
        image_registry[image_sha1] = { obj: image_obj, info: info }
      end

[image_obj, info]
    end

# Given a PDF image resource <tt>pdf_obj</tt> that has been added to the
    # page's resources and an <tt>info</tt> object (the pair returned from
    # build_image_object), embed the image according to the <tt>options</tt>
    # given.
    #
    # @private
    def embed_image(pdf_obj, info, options)
      # find where the image will be placed and how big it will be
      w, h = info.calc_image_dimensions(options)

if options[:at]
        x, y = map_to_absolute(options[:at])
      else
        x, y = image_position(w, h, options)
        move_text_position h
      end

# add a reference to the image object to the current page
      # resource list and give it a label
      label = "I#{next_image_id}"
      state.page.xobjects[label] = pdf_obj

cm_params = PDF::Core.real_params([w, 0, 0, h, x, y - h])
      renderer.add_content("\nq\n#{cm_params} cm\n/#{label} Do\nQ")
    end

private

def verify_and_open_image(io_or_path)
      # File or IO
      if io_or_path.respond_to?(:rewind)
        io = io_or_path
        # Rewind if the object we're passed is an IO, so that multiple embeds of
        # the same IO object will work
        io.rewind
        # read the file as binary so the size is calculated correctly
        # guard binmode because some objects acting io-like don't implement it
        io.binmode if io.respond_to?(:binmode)
        return io
      end
      # String or Pathname
      io_or_path = Pathname.new(io_or_path)
      raise ArgumentError, "#{io_or_path} not found" unless io_or_path.file?
      io = io_or_path.open('rb')
      io
    end

def image_position(w, h, options)
      options[:position] ||= :left

y = case options[:vposition]
          when :top
            bounds.absolute_top
          when :center
            bounds.absolute_top - (bounds.height - h) / 2.0
          when :bottom
            bounds.absolute_bottom + h
          when Numeric
            bounds.absolute_top - options[:vposition]
          else
            determine_y_with_page_flow(h)
          end

x = case options[:position]
          when :left
            bounds.left_side
          when :center
            bounds.left_side + (bounds.width - w) / 2.0
          when :right
            bounds.right_side - w
          when Numeric
            options[:position] + bounds.left_side
          end

[x, y]
    end

def determine_y_with_page_flow(h)
      if overruns_page?(h)
        bounds.move_past_bottom
      end
      y
    end

def overruns_page?(h)
      (y - h) < reference_bounds.absolute_bottom
    end

def image_registry
      @image_registry ||= {}
    end

def next_image_id
      @image_counter ||= 0
      @image_counter += 1
    end
  end
end

${this.title}

Code Editor : images.rb