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# $Id: RMagick.rb,v 1.51.4.1 2008/02/14 00:00:49 rmagick Exp $
#==============================================================================
# Copyright (C) 2007 by Timothy P. Hunter
# Name: RMagick.rb
# Author: Tim Hunter
# Purpose: Extend Ruby to interface with ImageMagick.
# Notes: RMagick.so defines the classes. The code below adds methods
# to the classes.
#==============================================================================
require 'RMagick.so'
module Magick
@@formats = nil
def Magick.formats(&block)
@@formats ||= Magick.init_formats
if block_given?
@@formats.each { |k,v| yield(k,v) }
self
else
@@formats
end
end
# Geometry class and related enum constants
class GeometryValue < Enum
# no methods
end
PercentGeometry = GeometryValue.new(:PercentGeometry, 1)
AspectGeometry = GeometryValue.new(:AspectGeometry, 2)
LessGeometry = GeometryValue.new(:LessGeometry, 3)
GreaterGeometry = GeometryValue.new(:GreaterGeometry, 4)
AreaGeometry = GeometryValue.new(:AreaGeometry, 5)
class Geometry
FLAGS = ['', '%', '!', '<', '>', '@']
RFLAGS = { '%' => PercentGeometry,
'!' => AspectGeometry,
'<' => LessGeometry,
'>' => GreaterGeometry,
'@' => AreaGeometry }
attr_accessor :width, :height, :x, :y, :flag
def initialize(width=nil, height=nil, x=nil, y=nil, flag=nil)
# Support floating-point width and height arguments so Geometry
# objects can be used to specify Image#density= arguments.
if width == nil
@width = 0
elsif width.to_f >= 0.0
@width = width.to_f
else
Kernel.raise ArgumentError, "width must be >= 0: #{width}"
end
if height == nil
@height = 0
elsif height.to_f >= 0.0
@height = height.to_f
else
Kernel.raise ArgumentError, "height must be >= 0: #{height}"
end
@x = x.to_i
@y = y.to_i
@flag = flag
end
# Construct an object from a geometry string
RE = /\A(\d*)(?:x(\d+))?([-+]\d+)?([-+]\d+)?([%!<>@]?)\Z/
def Geometry.from_s(str)
Kernel.raise(ArgumentError, "no geometry string specified") unless str
m = RE.match(str)
if m
width = m[1].to_i
height = m[2].to_i
x = m[3].to_i
y = m[4].to_i
flag = RFLAGS[m[5]]
else
Kernel.raise ArgumentError, "invalid geometry format"
end
Geometry.new(width, height, x, y, flag)
end
# Convert object to a geometry string
def to_s
str = ''
str << sprintf("%g", @width) if @width > 0
str << 'x' if (@width > 0 || @height > 0)
str << sprintf("%g", @height) if @height > 0
str << sprintf("%+d%+d", @x, @y) if (@x != 0 || @y != 0)
str << FLAGS[@flag.to_i]
end
end
class Draw
# Thse hashes are used to map Magick constant
# values to the strings used in the primitives.
ALIGN_TYPE_NAMES = {
LeftAlign.to_i => 'left',
RightAlign.to_i => 'right',
CenterAlign.to_i => 'center'
}.freeze
ANCHOR_TYPE_NAMES = {
StartAnchor.to_i => 'start',
MiddleAnchor.to_i => 'middle',
EndAnchor.to_i => 'end'
}.freeze
DECORATION_TYPE_NAMES = {
NoDecoration.to_i => 'none',
UnderlineDecoration.to_i => 'underline',
OverlineDecoration.to_i => 'overline',
LineThroughDecoration.to_i => 'line-through'
}.freeze
FONT_WEIGHT_NAMES = {
AnyWeight.to_i => 'all',
NormalWeight.to_i => 'normal',
BoldWeight.to_i => 'bold',
BolderWeight.to_i => 'bolder',
LighterWeight.to_i => 'lighter',
}.freeze
GRAVITY_NAMES = {
NorthWestGravity.to_i => 'northwest',
NorthGravity.to_i => 'north',
NorthEastGravity.to_i => 'northeast',
WestGravity.to_i => 'west',
CenterGravity.to_i => 'center',
EastGravity.to_i => 'east',
SouthWestGravity.to_i => 'southwest',
SouthGravity.to_i => 'south',
SouthEastGravity.to_i => 'southeast'
}.freeze
PAINT_METHOD_NAMES = {
PointMethod.to_i => 'point',
ReplaceMethod.to_i => 'replace',
FloodfillMethod.to_i => 'floodfill',
FillToBorderMethod.to_i => 'filltoborder',
ResetMethod.to_i => 'reset'
}.freeze
STRETCH_TYPE_NAMES = {
NormalStretch.to_i => 'normal',
UltraCondensedStretch.to_i => 'ultra-condensed',
ExtraCondensedStretch.to_i => 'extra-condensed',
CondensedStretch.to_i => 'condensed',
SemiCondensedStretch.to_i => 'semi-condensed',
SemiExpandedStretch.to_i => 'semi-expanded',
ExpandedStretch.to_i => 'expanded',
ExtraExpandedStretch.to_i => 'extra-expanded',
UltraExpandedStretch.to_i => 'ultra-expanded',
AnyStretch.to_i => 'all'
}.freeze
STYLE_TYPE_NAMES = {
NormalStyle.to_i => 'normal',
ItalicStyle.to_i => 'italic',
ObliqueStyle.to_i => 'oblique',
AnyStyle.to_i => 'all'
}.freeze
private
def enquote(str)
if str.length > 2 && /\A(?:\"[^\"]+\"|\'[^\']+\'|\{[^\}]+\})\z/.match(str)
return str
else
return '"' + str + '"'
end
end
public
# Apply coordinate transformations to support scaling (s), rotation (r),
# and translation (t). Angles are specified in radians.
def affine(sx, rx, ry, sy, tx, ty)
primitive "affine " + sprintf("%g,%g,%g,%g,%g,%g", sx, rx, ry, sy, tx, ty)
end
# Draw an arc.
def arc(startX, startY, endX, endY, startDegrees, endDegrees)
primitive "arc " + sprintf("%g,%g %g,%g %g,%g",
startX, startY, endX, endY, startDegrees, endDegrees)
end
# Draw a bezier curve.
def bezier(*points)
if points.length == 0
Kernel.raise ArgumentError, "no points specified"
elsif points.length % 2 != 0
Kernel.raise ArgumentError, "odd number of arguments specified"
end
primitive "bezier " + points.join(',')
end
# Draw a circle
def circle(originX, originY, perimX, perimY)
primitive "circle " + sprintf("%g,%g %g,%g", originX, originY, perimX, perimY)
end
# Invoke a clip-path defined by def_clip_path.
def clip_path(name)
primitive "clip-path #{name}"
end
# Define the clipping rule.
def clip_rule(rule)
if ( not ["evenodd", "nonzero"].include?(rule.downcase) )
Kernel.raise ArgumentError, "Unknown clipping rule #{rule}"
end
primitive "clip-rule #{rule}"
end
# Define the clip units
def clip_units(unit)
if ( not ["userspace", "userspaceonuse", "objectboundingbox"].include?(unit.downcase) )
Kernel.raise ArgumentError, "Unknown clip unit #{unit}"
end
primitive "clip-units #{unit}"
end
# Set color in image according to specified colorization rule. Rule is one of
# point, replace, floodfill, filltoborder,reset
def color(x, y, method)
if ( not PAINT_METHOD_NAMES.has_key?(method.to_i) )
Kernel.raise ArgumentError, "Unknown PaintMethod: #{method}"
end
primitive "color #{x},#{y},#{PAINT_METHOD_NAMES[method.to_i]}"
end
# Specify EITHER the text decoration (none, underline, overline,
# line-through) OR the text solid background color (any color name or spec)
def decorate(decoration)
if ( DECORATION_TYPE_NAMES.has_key?(decoration.to_i) )
primitive "decorate #{DECORATION_TYPE_NAMES[decoration.to_i]}"
else
primitive "decorate #{enquote(decoration)}"
end
end
# Define a clip-path. A clip-path is a sequence of primitives
# bracketed by the "push clip-path <name>" and "pop clip-path"
# primitives. Upon advice from the IM guys, we also bracket
# the clip-path primitives with "push(pop) defs" and "push
# (pop) graphic-context".
def define_clip_path(name)
begin
push('defs')
push('clip-path ', name)
push('graphic-context')
yield
ensure
pop('graphic-context')
pop('clip-path')
pop('defs')
end
end
# Draw an ellipse
def ellipse(originX, originY, width, height, arcStart, arcEnd)
primitive "ellipse " + sprintf("%g,%g %g,%g %g,%g",
originX, originY, width, height, arcStart, arcEnd)
end
# Let anything through, but the only defined argument
# is "UTF-8". All others are apparently ignored.
def encoding(encoding)
primitive "encoding #{encoding}"
end
# Specify object fill, a color name or pattern name
def fill(colorspec)
primitive "fill #{enquote(colorspec)}"
end
alias fill_color fill
alias fill_pattern fill
# Specify fill opacity (use "xx%" to indicate percentage)
def fill_opacity(opacity)
primitive "fill-opacity #{opacity}"
end
def fill_rule(rule)
if ( not ["evenodd", "nonzero"].include?(rule.downcase) )
Kernel.raise ArgumentError, "Unknown fill rule #{rule}"
end
primitive "fill-rule #{rule}"
end
# Specify text drawing font
def font(name)
primitive "font #{name}"
end
def font_family(name)
primitive "font-family \'#{name}\'"
end
def font_stretch(stretch)
if ( not STRETCH_TYPE_NAMES.has_key?(stretch.to_i) )
Kernel.raise ArgumentError, "Unknown stretch type"
end
primitive "font-stretch #{STRETCH_TYPE_NAMES[stretch.to_i]}"
end
def font_style(style)
if ( not STYLE_TYPE_NAMES.has_key?(style.to_i) )
Kernel.raise ArgumentError, "Unknown style type"
end
primitive "font-style #{STYLE_TYPE_NAMES[style.to_i]}"
end
# The font weight argument can be either a font weight
# constant or [100,200,...,900]
def font_weight(weight)
if ( FONT_WEIGHT_NAMES.has_key?(weight.to_i) )
primitive "font-weight #{FONT_WEIGHT_NAMES[weight.to_i]}"
else
primitive "font-weight #{weight}"
end
end
# Specify the text positioning gravity, one of:
# NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast
def gravity(grav)
if ( not GRAVITY_NAMES.has_key?(grav.to_i) )
Kernel.raise ArgumentError, "Unknown text positioning gravity"
end
primitive "gravity #{GRAVITY_NAMES[grav.to_i]}"
end
# Draw a line
def line(startX, startY, endX, endY)
primitive "line " + sprintf("%g,%g %g,%g", startX, startY, endX, endY)
end
# Set matte (make transparent) in image according to the specified
# colorization rule
def matte(x, y, method)
if ( not PAINT_METHOD_NAMES.has_key?(method.to_i) )
Kernel.raise ArgumentError, "Unknown paint method"
end
primitive "matte #{x},#{y} #{PAINT_METHOD_NAMES[method.to_i]}"
end
# Specify drawing fill and stroke opacities. If the value is a string
# ending with a %, the number will be multiplied by 0.01.
def opacity(opacity)
if (Numeric === opacity)
if (opacity < 0 || opacity > 1.0)
Kernel.raise ArgumentError, "opacity must be >= 0 and <= 1.0"
end
end
primitive "opacity #{opacity}"
end
# Draw using SVG-compatible path drawing commands. Note that the
# primitive requires that the commands be surrounded by quotes or
# apostrophes. Here we simply use apostrophes.
def path(cmds)
primitive "path '" + cmds + "'"
end
# Define a pattern. In the block, call primitive methods to
# draw the pattern. Reference the pattern by using its name
# as the argument to the 'fill' or 'stroke' methods
def pattern(name, x, y, width, height)
begin
push('defs')
push("pattern #{name} #{x} #{y} #{width} #{height}")
push('graphic-context')
yield
ensure
pop('graphic-context')
pop('pattern')
pop('defs')
end
end
# Set point to fill color.
def point(x, y)
primitive "point #{x},#{y}"
end
# Specify the font size in points. Yes, the primitive is "font-size" but
# in other places this value is called the "pointsize". Give it both names.
def pointsize(points)
primitive "font-size #{points}"
end
alias font_size pointsize
# Draw a polygon
def polygon(*points)
if points.length == 0
Kernel.raise ArgumentError, "no points specified"
elsif points.length % 2 != 0
Kernel.raise ArgumentError, "odd number of points specified"
end
primitive "polygon " + points.join(',')
end
# Draw a polyline
def polyline(*points)
if points.length == 0
Kernel.raise ArgumentError, "no points specified"
elsif points.length % 2 != 0
Kernel.raise ArgumentError, "odd number of points specified"
end
primitive "polyline " + points.join(',')
end
# Return to the previously-saved set of whatever
# pop('graphic-context') (the default if no arguments)
# pop('defs')
# pop('gradient')
# pop('pattern')
def pop(*what)
if what.length == 0
primitive "pop graphic-context"
else
# to_s allows a Symbol to be used instead of a String
primitive "pop " + what.to_s
end
end
# Push the current set of drawing options. Also you can use
# push('graphic-context') (the default if no arguments)
# push('defs')
# push('gradient')
# push('pattern')
def push(*what)
if what.length == 0
primitive "push graphic-context"
else
# to_s allows a Symbol to be used instead of a String
primitive "push " + what.to_s
end
end
# Draw a rectangle
def rectangle(upper_left_x, upper_left_y, lower_right_x, lower_right_y)
primitive "rectangle " + sprintf("%g,%g %g,%g",
upper_left_x, upper_left_y, lower_right_x, lower_right_y)
end
# Specify coordinate space rotation. "angle" is measured in degrees
def rotate(angle)
primitive "rotate #{angle}"
end
# Draw a rectangle with rounded corners
def roundrectangle(center_x, center_y, width, height, corner_width, corner_height)
primitive "roundrectangle " + sprintf("%g,%g,%g,%g,%g,%g",
center_x, center_y, width, height, corner_width, corner_height)
end
# Specify scaling to be applied to coordinate space on subsequent drawing commands.
def scale(x, y)
primitive "scale #{x},#{y}"
end
def skewx(angle)
primitive "skewX #{angle}"
end
def skewy(angle)
primitive "skewY #{angle}"
end
# Specify the object stroke, a color name or pattern name.
def stroke(colorspec)
primitive "stroke #{enquote(colorspec)}"
end
alias stroke_color stroke
alias stroke_pattern stroke
# Specify if stroke should be antialiased or not
def stroke_antialias(bool)
bool = bool ? '1' : '0'
primitive "stroke-antialias #{bool}"
end
# Specify a stroke dash pattern
def stroke_dasharray(*list)
if list.length == 0
primitive "stroke-dasharray none"
else
list.each { |x|
if x <= 0 then
Kernel.raise ArgumentError, "dash array elements must be > 0 (#{x} given)"
end
}
primitive "stroke-dasharray #{list.join(',')}"
end
end
# Specify the initial offset in the dash pattern
def stroke_dashoffset(value=0)
primitive "stroke-dashoffset #{value}"
end
def stroke_linecap(value)
if ( not ["butt", "round", "square"].include?(value.downcase) )
Kernel.raise ArgumentError, "Unknown linecap type: #{value}"
end
primitive "stroke-linecap #{value}"
end
def stroke_linejoin(value)
if ( not ["round", "miter", "bevel"].include?(value.downcase) )
Kernel.raise ArgumentError, "Unknown linejoin type: #{value}"
end
primitive "stroke-linejoin #{value}"
end
def stroke_miterlimit(value)
if (value < 1)
Kernel.raise ArgumentError, "miterlimit must be >= 1"
end
primitive "stroke-miterlimit #{value}"
end
# Specify opacity of stroke drawing color
# (use "xx%" to indicate percentage)
def stroke_opacity(value)
primitive "stroke-opacity #{value}"
end
# Specify stroke (outline) width in pixels.
def stroke_width(pixels)
primitive "stroke-width #{pixels}"
end
# Draw text at position x,y. Add quotes to text that is not already quoted.
def text(x, y, text)
if text.to_s.empty?
Kernel.raise ArgumentError, "missing text argument"
end
if text.length > 2 && /\A(?:\"[^\"]+\"|\'[^\']+\'|\{[^\}]+\})\z/.match(text)
; # text already quoted
elsif !text['\'']
text = '\''+text+'\''
elsif !text['"']
text = '"'+text+'"'
elsif !(text['{'] || text['}'])
text = '{'+text+'}'
else
# escape existing braces, surround with braces
text = '{' + text.gsub(/[}]/) { |b| '\\' + b } + '}'
end
primitive "text #{x},#{y} #{text}"
end
# Specify text alignment relative to a given point
def text_align(alignment)
if ( not ALIGN_TYPE_NAMES.has_key?(alignment.to_i) )
Kernel.raise ArgumentError, "Unknown alignment constant: #{alignment}"
end
primitive "text-align #{ALIGN_TYPE_NAMES[alignment.to_i]}"
end
# SVG-compatible version of text_align
def text_anchor(anchor)
if ( not ANCHOR_TYPE_NAMES.has_key?(anchor.to_i) )
Kernel.raise ArgumentError, "Unknown anchor constant: #{anchor}"
end
primitive "text-anchor #{ANCHOR_TYPE_NAMES[anchor.to_i]}"
end
# Specify if rendered text is to be antialiased.
def text_antialias(boolean)
boolean = boolean ? '1' : '0'
primitive "text-antialias #{boolean}"
end
# Specify color underneath text
def text_undercolor(color)
primitive "text-undercolor #{enquote(color)}"
end
# Specify center of coordinate space to use for subsequent drawing
# commands.
def translate(x, y)
primitive "translate #{x},#{y}"
end
end # class Magick::Draw
# Define IPTC record number:dataset tags for use with Image#get_iptc_dataset
module IPTC
module Envelope
Model_Version = "1:00"
Destination = "1:05"
File_Format = "1:20"
File_Format_Version = "1:22"
Service_Identifier = "1:30"
Envelope_Number = "1:40"
Product_ID = "1:50"
Envelope_Priority = "1:60"
Date_Sent = "1:70"
Time_Sent = "1:80"
Coded_Character_Set = "1:90"
UNO = "1:100"
Unique_Name_of_Object = "1:100"
ARM_Identifier = "1:120"
ARM_Version = "1:122"
end
module Application
#Record_Version = "2:00" abends with IM 6.2.9
Object_Type_Reference = "2:03"
Object_Name = "2:05"
Title = "2:05"
Edit_Status = "2:07"
Editorial_Update = "2:08"
Urgency = "2:10"
Subject_Reference = "2:12"
Category = "2:15"
Supplemental_Category = "2:20"
Fixture_Identifier = "2:22"
Keywords = "2:25"
Content_Location_Code = "2:26"
Content_Location_Name = "2:27"
Release_Date = "2:30"
Release_Time = "2:35"
Expiration_Date = "2:37"
Expiration_Time = "2:35"
Special_Instructions = "2:40"
Action_Advised = "2:42"
Reference_Service = "2:45"
Reference_Date = "2:47"
Reference_Number = "2:50"
Date_Created = "2:55"
Time_Created = "2:60"
Digital_Creation_Date = "2:62"
Digital_Creation_Time = "2:63"
Originating_Program = "2:65"
Program_Version = "2:70"
Object_Cycle = "2:75"
By_Line = "2:80"
Author = "2:80"
By_Line_Title = "2:85"
Author_Position = "2:85"
City = "2:90"
Sub_Location = "2:92"
Province = "2:95"
State = "2:95"
Country_Primary_Location_Code = "2:100"
Country_Primary_Location_Name = "2:101"
Original_Transmission_Reference = "2:103"
Headline = "2:105"
Credit = "2:110"
Source = "2:115"
Copyright_Notice = "2:116"
Contact = "2:118"
Abstract = "2:120"
Caption = "2:120"
Editor = "2:122"
Caption_Writer = "2:122"
Rasterized_Caption = "2:125"
Image_Type = "2:130"
Image_Orientation = "2:131"
Language_Identifier = "2:135"
Audio_Type = "2:150"
Audio_Sampling_Rate = "2:151"
Audio_Sampling_Resolution = "2:152"
Audio_Duration = "2:153"
Audio_Outcue = "2:154"
ObjectData_Preview_File_Format = "2:200"
ObjectData_Preview_File_Format_Version = "2:201"
ObjectData_Preview_Data = "2:202"
end
module Pre_ObjectData_Descriptor
Size_Mode = "7:10"
Max_Subfile_Size = "7:20"
ObjectData_Size_Announced = "7:90"
Maximum_ObjectData_Size = "7:95"
end
module ObjectData
Subfile = "8:10"
end
module Post_ObjectData_Descriptor
Confirmed_ObjectData_Size = "9:10"
end
# Make all constants above immutable
constants.each do |record|
rec = const_get(record)
rec.constants.each { |ds| rec.const_get(ds).freeze }
end
end # module Magick::IPTC
# Ruby-level Magick::Image methods
class Image
include Comparable
# Provide an alternate version of Draw#annotate, for folks who
# want to find it in this class.
def annotate(draw, width, height, x, y, text, &block)
draw.annotate(self, width, height, x, y, text, &block)
self
end
# Set the color at x,y
def color_point(x, y, fill)
f = copy
f.pixel_color(x, y, fill)
return f
end
# Set all pixels that have the same color as the pixel at x,y and
# are neighbors to the fill color
def color_floodfill(x, y, fill)
target = pixel_color(x, y)
color_flood_fill(target, fill, x, y, Magick::FloodfillMethod)
end
# Set all pixels that are neighbors of x,y and are not the border color
# to the fill color
def color_fill_to_border(x, y, fill)
color_flood_fill(border_color, fill, x, y, Magick::FillToBorderMethod)
end
# Set all pixels to the fill color. Very similar to Image#erase!
# Accepts either String or Pixel arguments
def color_reset!(fill)
save = background_color
# Change the background color _outside_ the begin block
# so that if this object is frozen the exeception will be
# raised before we have to handle it explicitly.
self.background_color = fill
begin
erase!
ensure
self.background_color = save
end
self
end
# Force an image to exact dimensions without changing the aspect ratio.
# Resize and crop if necessary. (Thanks to Jerett Taylor!)
def crop_resized(ncols, nrows, gravity=CenterGravity)
copy.crop_resized!(ncols, nrows, gravity)
end
def crop_resized!(ncols, nrows, gravity=CenterGravity)
if ncols != columns || nrows != rows
scale = [ncols/columns.to_f, nrows/rows.to_f].max
resize!(scale*columns+0.5, scale*rows+0.5)
end
crop!(gravity, ncols, nrows, true) if ncols != columns || nrows != rows
self
end
# Used by ImageList methods - see ImageList#cur_image
def cur_image
self
end
# Retrieve EXIF data by entry or all. If one or more entry names specified,
# return the values associated with the entries. If no entries specified,
# return all entries and values. The return value is an array of [name,value]
# arrays.
def get_exif_by_entry(*entry)
ary = Array.new
if entry.length == 0
exif_data = self['EXIF:*']
if exif_data
exif_data.split("\n").each { |exif| ary.push(exif.split('=')) }
end
else
entry.each do |name|
rval = self["EXIF:#{name}"]
ary.push([name, rval])
end
end
return ary
end
# Retrieve EXIF data by tag number or all tag/value pairs. The return value is a hash.
def get_exif_by_number(*tag)
hash = Hash.new
if tag.length == 0
exif_data = self['EXIF:!']
if exif_data
exif_data.split("\n").each do |exif|
tag, value = exif.split('=')
tag = tag[1,4].hex
hash[tag] = value
end
end
else
tag.each do |num|
rval = self['#%04X' % num]
hash[num] = rval == 'unknown' ? nil : rval
end
end
return hash
end
# Retrieve IPTC information by record number:dataset tag constant defined in
# Magick::IPTC, above.
def get_iptc_dataset(ds)
self['IPTC:'+ds]
end
# Iterate over IPTC record number:dataset tags, yield for each non-nil dataset
def each_iptc_dataset
Magick::IPTC.constants.each do |record|
rec = Magick::IPTC.const_get(record)
rec.constants.each do |dataset|
data_field = get_iptc_dataset(rec.const_get(dataset))
yield(dataset, data_field) unless data_field.nil?
end
end
nil
end
# Patches problematic change to the order of arguments in 1.11.0.
# Before this release, the order was
# black_point, gamma, white_point
# RMagick 1.11.0 changed this to
# black_point, white_point, gamma
# This fix tries to determine if the arguments are in the old order and
# if so, swaps the gamma and white_point arguments. Then it calls
# level2, which simply accepts the arguments as given.
# Inspect the gamma and white point values and swap them if they
# look like they're in the old order.
# (Thanks to Al Evans for the suggestion.)
def level(black_point=0.0, white_point=nil, gamma=nil)
black_point = Float(black_point)
white_point ||= Magick::MaxRGB - black_point
white_point = Float(white_point)
gamma_arg = gamma
gamma ||= 1.0
gamma = Float(gamma)
if gamma.abs > 10.0 || white_point.abs <= 10.0 || white_point.abs < gamma.abs
gamma, white_point = white_point, gamma
unless gamma_arg
white_point = Magick::MaxRGB - black_point
end
end
return level2(black_point, white_point, gamma)
end
# These four methods are equivalent to the Draw#matte method
# with the "Point", "Replace", "Floodfill", "FilltoBorder", and
# "Replace" arguments, respectively.
# Make the pixel at (x,y) transparent.
def matte_point(x, y)
f = copy
f.opacity = OpaqueOpacity unless f.matte
pixel = f.pixel_color(x,y)
pixel.opacity = TransparentOpacity
f.pixel_color(x, y, pixel)
return f
end
# Make transparent all pixels that are the same color as the
# pixel at (x, y).
def matte_replace(x, y)
f = copy
f.opacity = OpaqueOpacity unless f.matte
target = f.pixel_color(x, y)
f.transparent(target)
end
# Make transparent any pixel that matches the color of the pixel
# at (x,y) and is a neighbor.
def matte_floodfill(x, y)
f = copy
f.opacity = OpaqueOpacity unless f.matte
target = f.pixel_color(x, y)
f.matte_flood_fill(target, TransparentOpacity,
x, y, FloodfillMethod)
end
# Make transparent any neighbor pixel that is not the border color.
def matte_fill_to_border(x, y)
f = copy
f.opacity = Magick::OpaqueOpacity unless f.matte
f.matte_flood_fill(border_color, TransparentOpacity,
x, y, FillToBorderMethod)
end
# Make all pixels transparent.
def matte_reset!
self.opacity = Magick::TransparentOpacity
self
end
# Corresponds to ImageMagick's -resample option
def resample(x_res=72.0, y_res=nil)
y_res ||= x_res
width = x_res * columns / x_resolution + 0.5
height = y_res * rows / y_resolution + 0.5
self.x_resolution = x_res
self.y_resolution = y_res
resize(width, height)
end
# Convenience method to resize retaining the aspect ratio.
# (Thanks to Robert Manni!)
def resize_to_fit(cols, rows)
change_geometry(Geometry.new(cols, rows)) do |ncols, nrows|
resize(ncols, nrows)
end
end
def resize_to_fit!(cols, rows)
change_geometry(Geometry.new(cols, rows)) do |ncols, nrows|
resize!(ncols, nrows)
end
end
# Replace matching neighboring pixels with texture pixels
def texture_floodfill(x, y, texture)
target = pixel_color(x, y)
texture_flood_fill(target, texture, x, y, FloodfillMethod)
end
# Replace neighboring pixels to border color with texture pixels
def texture_fill_to_border(x, y, texture)
texture_flood_fill(border_color, texture, x, y, FillToBorderMethod)
end
# Construct a view. If a block is present, yield and pass the view
# object, otherwise return the view object.
def view(x, y, width, height)
view = View.new(self, x, y, width, height)
if block_given?
begin
yield(view)
ensure
view.sync
end
return nil
else
return view
end
end
# Magick::Image::View class
class View
attr_reader :x, :y, :width, :height
attr_accessor :dirty
def initialize(img, x, y, width, height)
if width <= 0 || height <= 0
Kernel.raise ArgumentError, "invalid geometry (#{width}x#{height}+#{x}+#{y})"
end
if x < 0 || y < 0 || (x+width) > img.columns || (y+height) > img.rows
Kernel.raise RangeError, "geometry (#{width}x#{height}+#{x}+#{y}) exceeds image boundary"
end
@view = img.get_pixels(x, y, width, height)
@img = img
@x = x
@y = y
@width = width
@height = height
@dirty = false
end
def [](*args)
rows = Rows.new(@view, @width, @height, args)
rows.add_observer(self)
return rows
end
# Store changed pixels back to image
def sync(force=false)
@img.store_pixels(x, y, width, height, @view) if (@dirty || force)
return (@dirty || force)
end
# Get update from Rows - if @dirty ever becomes
# true, don't change it back to false!
def update(rows)
@dirty = true
rows.delete_observer(self) # No need to tell us again.
nil
end
# Magick::Image::View::Pixels
# Defines channel attribute getters/setters
class Pixels < Array
include Observable
# Define a getter and a setter for each channel.
[:red, :green, :blue, :opacity].each do |c|
module_eval <<-END_EVAL
def #{c}
return collect { |p| p.#{c} }
end
def #{c}=(v)
each { |p| p.#{c} = v }
changed
notify_observers(self)
nil
end
END_EVAL
end
end # class Magick::Image::View::Pixels
# Magick::Image::View::Rows
class Rows
include Observable
def initialize(view, width, height, rows)
@view = view
@width = width
@height = height
@rows = rows
end
def [](*args)
cols(args)
# Both View::Pixels and Magick::Pixel implement Observable
if @unique
pixels = @view[@rows[0]*@width + @cols[0]]
pixels.add_observer(self)
else
pixels = View::Pixels.new
each do |x|
p = @view[x]
p.add_observer(self)
pixels << p
end
end
pixels
end
def []=(*args)
rv = args.delete_at(-1) # get rvalue
if ! rv.is_a?(Pixel) # must be a Pixel or a color name
begin
rv = Pixel.from_color(rv)
rescue TypeError
Kernel.raise TypeError, "cannot convert #{rv.class} into Pixel"
end
end
cols(args)
each { |x| @view[x] = rv.dup }
changed
notify_observers(self)
nil
end
# A pixel has been modified. Tell the view.
def update(pixel)
changed
notify_observers(self)
pixel.delete_observer(self) # Don't need to hear again.
nil
end
private
def cols(*args)
@cols = args[0] # remove the outermost array
@unique = false
# Convert @rows to an Enumerable object
case @rows.length
when 0 # Create a Range for all the rows
@rows = Range.new(0, @height, true)
when 1 # Range, Array, or a single integer
# if the single element is already an Enumerable
# object, get it.
if @rows.first.respond_to? :each
@rows = @rows.first
else
@rows = Integer(@rows.first)
if @rows < 0
@rows += @height
end
if @rows < 0 || @rows > @height-1
Kernel.raise IndexError, "index [#{@rows}] out of range"
end
# Convert back to an array
@rows = Array.new(1, @rows)
@unique = true
end
when 2
# A pair of integers representing the starting column and the number of columns
start = Integer(@rows[0])
length = Integer(@rows[1])
# Negative start -> start from last row
if start < 0
start += @height
end
if start > @height || start < 0 || length < 0
Kernel.raise IndexError, "index [#{@rows.first}] out of range"
else
if start + length > @height
length = @height - length
length = [length, 0].max
end
end
# Create a Range for the specified set of rows
@rows = Range.new(start, start+length, true)
end
case @cols.length
when 0 # all rows
@cols = Range.new(0, @width, true) # convert to range
@unique = false
when 1 # Range, Array, or a single integer
# if the single element is already an Enumerable
# object, get it.
if @cols.first.respond_to? :each
@cols = @cols.first
@unique = false
else
@cols = Integer(@cols.first)
if @cols < 0
@cols += @width
end
if @cols < 0 || @cols > @width-1
Kernel.raise IndexError, "index [#{@cols}] out of range"
end
# Convert back to array
@cols = Array.new(1, @cols)
@unique &&= true
end
when 2
# A pair of integers representing the starting column and the number of columns
start = Integer(@cols[0])
length = Integer(@cols[1])
# Negative start -> start from last row
if start < 0
start += @width
end
if start > @width || start < 0 || length < 0
; #nop
else
if start + length > @width
length = @width - length
length = [length, 0].max
end
end
# Create a Range for the specified set of columns
@cols = Range.new(start, start+length, true)
@unique = false
end
end
# iterator called from subscript methods
def each
maxrows = @height - 1
maxcols = @width - 1
@rows.each do |j|
if j > maxrows
Kernel.raise IndexError, "index [#{j}] out of range"
end
@cols.each do |i|
if i > maxcols
Kernel.raise IndexError, "index [#{i}] out of range"
end
yield j*@width + i
end
end
nil # useless return value
end
end # class Magick::Image::View::Rows
end # class Magick::Image::View
end # class Magick::Image
class ImageList < Array
include Comparable
undef_method :assoc
undef_method :flatten! # These methods are undefined
undef_method :flatten # because they're not useful
undef_method :join # for an ImageList object
undef_method :pack
undef_method :rassoc
undef_method :transpose if Array.instance_methods(false).include? 'transpose'
undef_method :zip if Array.instance_methods(false).include? 'zip'
attr_reader :scene
protected
def is_a_image(obj)
unless obj.kind_of? Magick::Image
Kernel.raise ArgumentError, "Magick::Image required (#{obj.class} given)"
end
true
end
# Ensure array is always an array of Magick::Image objects
def is_a_image_array(ary)
unless ary.respond_to? :each
Kernel.raise ArgumentError, "Magick::ImageList or array of Magick::Images required (#{ary.class} given)"
end
ary.each { |obj| is_a_image obj }
true
end
# Find old current image, update @scene
# cfid is the id of the old current image.
def set_cf(cfid)
if length == 0
@scene = nil
return
# Don't bother looking for current image
elsif @scene == nil || @scene >= length
@scene = length - 1
return
elsif cfid != nil
each_with_index do |f,i|
if f.__id__ == cfid
@scene = i
return
end
end
end
@scene = length - 1
end
public
# Allow scene to be set to nil
def scene=(n)
if n.nil?
Kernel.raise IndexError, "scene number out of bounds" unless length == 0
@scene = nil
return @scene
elsif length == 0
Kernel.raise IndexError, "scene number out of bounds"
end
n = Integer(n)
if n < 0 || n > length - 1
Kernel.raise IndexError, "scene number out of bounds"
end
@scene = n
return @scene
end
def [](*args)
if (args.length > 1) || args[0].kind_of?(Range)
self.class.new.replace super
else
super
end
end
def []=(*args)
if args.length == 3 # f[start,length] = [f1,f2...]
args[2].kind_of?(Magick::Image) || is_a_image_array(args[2])
super
args[0] = args[0] + length if (args[0] < 0)
args[1] = length - args[0] if (args[0] + args[1] > length)
if args[2].kind_of?(Magick::Image)
@scene = args[0]
else
@scene = args[0] + args[2].length - 1
end
elsif args[0].kind_of? Range # f[first..last] = [f1,f2...]
args[1].kind_of?(Magick::Image) || is_a_image_array(args[1])
super
@scene = args[0].end
else # f[index] = f1
is_a_image args[1]
super # index can be negative
@scene = args[0] < 0 ? length + args[0] : args[0]
end
args.last # return value is always assigned value
end
def &(other)
is_a_image_array other
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def *(n)
unless n.kind_of? Integer
Kernel.raise ArgumentError, "Integer required (#{n.class} given)"
end
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def +(other)
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def -(other)
is_a_image_array other
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def <<(obj)
is_a_image obj
a = super
@scene = length-1
return a
end
def |(other)
is_a_image_array other
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def clear
@scene = nil
super
end
def collect(&block)
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def collect!(&block)
super
is_a_image_array self
self
end
def compact
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def compact!
cfid = self[@scene].__id__ rescue nil
a = super # returns nil if no changes were made
set_cf cfid
return a
end
def concat(other)
is_a_image_array other
a = super
@scene = length-1
return a
end
def delete(obj, &block)
is_a_image obj
cfid = self[@scene].__id__ rescue nil
a = super
set_cf cfid
return a
end
def delete_at(ndx)
cfid = self[@scene].__id__ rescue nil
a = super
set_cf cfid
return a
end
def delete_if(&block)
cfid = self[@scene].__id__ rescue nil
a = super
set_cf cfid
return a
end
def fill(*args, &block)
is_a_image args[0] unless block_given?
cfid = self[@scene].__id__ rescue nil
super
is_a_image_array self
set_cf cfid
return self
end
def find_all(&block)
cfid = self[@scene].__id__ rescue nil
a = super
a.set_cf cfid
return a
end
if self.superclass.instance_methods(true).include? 'insert' then
def insert(*args)
Kernel.raise(ArgumentError, "can't insert nil") unless args.length > 1
is_a_image_array args[1,args.length-1]
cfid = self[@scene].__id__ rescue nil
super
set_cf cfid
return self
end
end
# Enumerable (or Array) has a #map method that conflicts with our
# own #map method. RMagick.so has defined a synonym for that #map
# called Array#__ary_map__. Here, we define Magick::ImageList#__map__
# to allow the use of the Enumerable/Array#map method on ImageList objects.
def __map__(&block)
cfid = self[@scene].__id__ rescue nil
ensure_image = Proc.new do |img|
rv = block.call(img)
is_a_image rv
return rv
end
a = self.class.new.replace __ary_map__(&ensure_image)
a.set_cf cfid
return a
end
def map!(&block)
ensure_image = Proc.new do |img|
rv = block.call(img)
is_a_image rv
return rv
end
super(&ensure_image)
end
def pop
cfid = self[@scene].__id__ rescue nil
a = super # can return nil
set_cf cfid
return a
end
def push(*objs)
objs.each { |o| is_a_image o }
super
@scene = length - 1
self
end
def reject(&block)
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def reject!(&block)
cfid = self[@scene].__id__ rescue nil
a = super # can return nil
set_cf cfid
return a
end
def replace(other)
is_a_image_array other
# Since replace gets called so frequently when @scene == nil
# test for it instead of letting rescue catch it.
cfid = nil
if @scene then
cfid = self[@scene].__id__ rescue nil
end
super
# set_cf will fail if the new list has fewer images
# than the scene number indicates.
@scene = self.length == 0 ? nil : 0
set_cf cfid
self
end
def reverse
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def reverse!
cfid = self[@scene].__id__ rescue nil
a = super
set_cf cfid
return a
end
def select(&block)
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def shift
cfid = self[@scene].__id__ rescue nil
a = super
set_cf cfid
return a
end
def slice(*args)
self[*args]
end
def slice!(*args)
cfid = self[@scene].__id__ rescue nil
if args.length > 1 || args[0].kind_of?(Range)
a = self.class.new.replace super
else
a = super
end
set_cf cfid
return a
end
def uniq
cfid = self[@scene].__id__ rescue nil
a = self.class.new.replace super
a.set_cf cfid
return a
end
def uniq!(*args)
cfid = self[@scene].__id__ rescue nil
a = super
set_cf cfid
return a
end
# @scene -> new object
def unshift(obj)
is_a_image obj
a = super
@scene = 0
return a
end
# Compare ImageLists
# Compare each image in turn until the result of a comparison
# is not 0. If all comparisons return 0, then
# return if A.scene != B.scene
# return A.length <=> B.length
def <=>(other)
unless other.kind_of? self.class
Kernel.raise TypeError, "#{self.class} required (#{other.class} given)"
end
size = [self.length, other.length].min
size.times do |x|
r = self[x] <=> other[x]
return r unless r == 0
end
if @scene.nil? && other.scene.nil?
return 0
elsif @scene.nil? && ! other.scene.nil?
Kernel.raise TypeError, "cannot convert nil into #{other.scene.class}"
elsif ! @scene.nil? && other.scene.nil?
Kernel.raise TypeError, "cannot convert nil into #{self.scene.class}"
end
r = self.scene <=> other.scene
return r unless r == 0
return self.length <=> other.length
end
def clone
ditto = dup
ditto.freeze if frozen?
return ditto
end
# Make a deep copy
def copy
ditto = self.class.new
each { |f| ditto << f.copy }
ditto.scene = @scene
ditto.taint if tainted?
return ditto
end
# Return the current image
def cur_image
if ! @scene
Kernel.raise IndexError, "no images in this list"
end
self[@scene]
end
# Set same delay for all images
def delay=(d)
if Integer(d) < 0
raise ArgumentError, "delay must be greater than or equal to 0"
end
each { |f| f.delay = Integer(d) }
end
def ticks_per_second=(t)
if Integer(t) < 0
Kernel.raise ArgumentError, "ticks_per_second must be greater than or equal to 0"
end
each { |f| f.ticks_per_second = Integer(t) }
end
def dup
ditto = self.class.new
each {|img| ditto << img}
ditto.scene = @scene
ditto.taint if tainted?
return ditto
end
def from_blob(*blobs, &block)
if (blobs.length == 0)
Kernel.raise ArgumentError, "no blobs given"
end
blobs.each { |b|
Magick::Image.from_blob(b, &block).each { |n| self << n }
}
@scene = length - 1
self
end
# Initialize new instances
def initialize(*filenames)
@scene = nil
filenames.each { |f|
Magick::Image.read(f).each { |n| self << n }
}
if length > 0
@scene = length - 1 # last image in array
end
self
end
# Call inspect for all the images
def inspect
ins = '['
each {|image| ins << image.inspect << "\n"}
ins.chomp("\n") + "]\nscene=#{@scene}"
end
# Set the number of iterations of an animated GIF
def iterations=(n)
n = Integer(n)
if n < 0 || n > 65535
Kernel.raise ArgumentError, "iterations must be between 0 and 65535"
end
each {|f| f.iterations=n}
self
end
# The ImageList class supports the Magick::Image class methods by simply sending
# the method to the current image. If the method isn't explicitly supported,
# send it to the current image in the array. If there are no images, send
# it up the line. Catch a NameError and emit a useful message.
def method_missing(methID, *args, &block)
begin
if @scene
self[@scene].send(methID, *args, &block)
else
super
end
rescue NoMethodError
Kernel.raise NoMethodError, "undefined method `#{methID.id2name}' for #{self.class}"
rescue Exception
$@.delete_if { |s| /:in `send'$/.match(s) || /:in `method_missing'$/.match(s) }
Kernel.raise
end
end
# Ensure respond_to? answers correctly when we are delegating to Image
alias_method :__respond_to__?, :respond_to?
def respond_to?(methID, priv=false)
return true if __respond_to__?(methID, priv)
if @scene
self[@scene].respond_to?(methID, priv)
else
super
end
end
# Create a new image and add it to the end
def new_image(cols, rows, *fill, &info_blk)
self << Magick::Image.new(cols, rows, *fill, &info_blk)
end
# Ping files and concatenate the new images
def ping(*files, &block)
if (files.length == 0)
Kernel.raise ArgumentError, "no files given"
end
files.each { |f|
Magick::Image.ping(f, &block).each { |n| self << n }
}
@scene = length - 1
self
end
# Read files and concatenate the new images
def read(*files, &block)
if (files.length == 0)
Kernel.raise ArgumentError, "no files given"
end
files.each { |f|
Magick::Image.read(f, &block).each { |n| self << n }
}
@scene = length - 1
self
end
end # Magick::ImageList
# Example fill class. Fills the image with the specified background
# color, then crosshatches with the specified crosshatch color.
# @dist is the number of pixels between hatch lines.
# See Magick::Draw examples.
class HatchFill
def initialize(bgcolor, hatchcolor="white", dist=10)
@bgcolor = bgcolor
@hatchpixel = Pixel.from_color(hatchcolor)
@dist = dist
end
def fill(img) # required
img.background_color = @bgcolor
img.erase! # sets image to background color
pixels = Array.new([img.rows, img.columns].max, @hatchpixel)
@dist.step((img.columns-1)/@dist*@dist, @dist) { |x|
img.store_pixels(x,0,1,img.rows,pixels)
}
@dist.step((img.rows-1)/@dist*@dist, @dist) { |y|
img.store_pixels(0,y,img.columns,1,pixels)
}
end
end
end # Magick
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