Class: GD2::Image
Overview
Introduction
Image is the abstract base class for Image::IndexedColor and Image::TrueColor.
Creating and Importing
Image objects are created either as a blank array of pixels:
image = Image::IndexedColor.new(width, height)
image = Image::TrueColor.new(width, height)
or by loading image data from a file or a string containing one of the supported image formats:
image = Image.load(file)
image = Image.load(string)
or by importing image data from a file given by its pathname:
image = Image.import(filename)
Exporting
After manipulating an image, it can be exported to a string in one of the supported image formats:
image.jpeg(quality = nil)
image.png(level = nil)
image.gif
image.wbmp(fgcolor)
image.gd
image.gd2(fmt = FMT_COMPRESSED)
or to a file in a format determined by the filename extension:
image.export(filename, = {})
Direct Known Subclasses
Defined Under Namespace
Classes: IndexedColor, MemoryAllocationError, TrueColor, UnrecognizedImageTypeError
Instance Attribute Summary collapse
-
#image_ptr ⇒ Object
readonly
:nodoc:.
-
#palette ⇒ Object
readonly
The Palette object for this image.
Class Method Summary collapse
-
.create_image_ptr(sx, sy, alpha_blending = true) ⇒ Object
:nodoc:.
-
.import(filename, options = {}) ⇒ Object
Import an image from a file with the given
filename
. -
.load(src) ⇒ Object
Load an image from a file or a string.
-
.new(w, h) ⇒ Object
(also: [])
Create a new image of the specified dimensions.
Instance Method Summary collapse
-
#==(other) ⇒ Object
Compare this image with another image.
-
#[](x, y) ⇒ Object
Return the color of the pixel at image location (
x
,y
). -
#[]=(x, y, color) ⇒ Object
Set the color of the pixel at image location (
x
,y
). -
#alpha_blending=(bool) ⇒ Object
Set whether colors should be alpha blended with existing colors when pixels are modified.
-
#alpha_blending? ⇒ Boolean
Return true if colors will be alpha blended into the image when pixels are modified.
-
#aspect ⇒ Object
Return the aspect ratio of this image, as a floating point ratio of the width to the height.
-
#clipping ⇒ Object
Return the current clipping rectangle.
-
#clips?(x, y) ⇒ Boolean
Return true if the current clipping rectangle excludes the given point.
-
#color2pixel(color) ⇒ Object
Return a pixel value for the given
color
object. -
#compare(other) ⇒ Object
Compare this image with another image.
-
#copy_from(other, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w = nil, src_h = nil) ⇒ Object
Copy a portion of another image to this image.
-
#copy_from_rotated(other, dst_x, dst_y, src_x, src_y, w, h, angle) ⇒ Object
Copy a portion of another image to this image, rotating the source portion first by the indicated
angle
(in radians). -
#crop(x, y, w, h) ⇒ Object
Like Image#crop! except a new image is returned.
-
#crop!(x, y, w, h) ⇒ Object
Crop this image to the specified dimensions, such that (
x
,y
) becomes (0, 0). -
#draw {|Canvas.new(self)| ... } ⇒ Object
Provide a drawing environment for a block.
-
#dup ⇒ Object
Duplicate this image, copying all pixels to a new image.
-
#each ⇒ Object
Iterate over each row of pixels in the image, returning an array of pixel values.
-
#export(filename, options = {}) ⇒ Object
Export this image to a file with the given
filename
. -
#gd ⇒ Object
Encode and return data for this image in ???.gd??? format.
-
#gd2(fmt = FMT_COMPRESSED, chunk_size = 0) ⇒ Object
Encode and return data for this image in ???.gd2??? format.
-
#get_pixel(x, y) ⇒ Object
(also: #pixel)
Return the pixel value at image location (
x
,y
). -
#gif ⇒ Object
Encode and return data for this image in GIF format.
-
#height ⇒ Object
(also: #h)
Return the height of this image, in pixels.
-
#init_with_image(ptr) ⇒ Object
:nodoc:.
-
#init_with_size(sx, sy) ⇒ Object
:nodoc:.
-
#inspect ⇒ Object
:nodoc:.
-
#interlaced=(bool) ⇒ Object
Set whether this image will be stored in interlaced form when output as PNG or JPEG.
-
#interlaced? ⇒ Boolean
Return true if this image will be stored in interlaced form when output as PNG or JPEG.
-
#jpeg(quality = nil) ⇒ Object
Encode and return data for this image in JPEG format.
-
#merge_from(other, dst_x, dst_y, src_x, src_y, w, h, pct) ⇒ Object
Merge a portion of another image into this one by the amount specified as
pct
(a percentage). -
#optimize_palette ⇒ Object
Consolidate duplicate colors in this image, and eliminate all unused palette entries.
-
#pixel2color(pixel) ⇒ Object
Return a Color object for the given
pixel
value. -
#png(level = nil) ⇒ Object
Encode and return data for this image in PNG format.
-
#polar_transform(radius) ⇒ Object
Like Image#polar_transform! except a new image is returned.
-
#polar_transform!(radius) ⇒ Object
Transform this image into a new image of width and height
radius
??????2, in which the X axis of the original has been remapped to ?? (angle) and the Y axis of the original has been remapped to ?? (distance from center). -
#resize(w, h, resample = true) ⇒ Object
Like Image#resize! except a new image is returned.
-
#resize!(w, h, resample = true) ⇒ Object
Resize this image to the given dimensions.
-
#rotate(angle, axis_x = width / 2.0, axis_y = height / 2.0) ⇒ Object
Like Image#rotate! except a new image is returned.
-
#rotate!(angle, axis_x = width / 2.0, axis_y = height / 2.0) ⇒ Object
Rotate this image by the given
angle
(in radians) about the given axis coordinates. -
#save_alpha=(bool) ⇒ Object
Set whether this image will be stored with full alpha channel information when output as PNG.
-
#save_alpha? ⇒ Boolean
Return true if this image will be stored with full alpha channel information when output as PNG.
-
#set_pixel(x, y, value) ⇒ Object
Set the pixel value at image location (
x
,y
). -
#sharpen(pct) ⇒ Object
Sharpen this image by
pct
(a percentage) which can be greater than 1.0. -
#size ⇒ Object
Return the size of this image as an array [width, height], in pixels.
-
#to_indexed_color(colors = MAX_COLORS, dither = true) ⇒ Object
Return this image as an IndexedColor image, creating a copy if necessary.
-
#to_true_color ⇒ Object
Return this image as a TrueColor image, creating a copy if necessary.
-
#transparent ⇒ Object
Return the transparent color for this image, or nil if none has been set.
-
#transparent=(color) ⇒ Object
Set or unset the transparent color for this image.
-
#true_color? ⇒ Boolean
Return true if this image is a TrueColor image.
-
#uncrop(x1, y1 = x1, x2 = x1, y2 = y1) ⇒ Object
Like Image#uncrop! except a new image is returned.
-
#uncrop!(x1, y1 = x1, x2 = x1, y2 = y1) ⇒ Object
Expand the left, top, right, and bottom borders of this image by the given number of pixels.
-
#wbmp(fgcolor) ⇒ Object
Encode and return data for this image in WBMP format.
-
#width ⇒ Object
(also: #w)
Return the width of this image, in pixels.
-
#with_clipping(x1, y1, x2, y2) ⇒ Object
Temporarily set the clipping rectangle during the execution of a block.
Instance Attribute Details
#image_ptr ⇒ Object (readonly)
:nodoc:
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# File 'lib/gd2/image.rb', line 49 def image_ptr @image_ptr end |
#palette ⇒ Object (readonly)
The Palette object for this image
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# File 'lib/gd2/image.rb', line 52 def palette @palette end |
Class Method Details
.create_image_ptr(sx, sy, alpha_blending = true) ⇒ Object
:nodoc:
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# File 'lib/gd2/image.rb', line 206 def self.create_image_ptr(sx, sy, alpha_blending = true) #:nodoc: x = sx.to_i y = sy.to_i raise ArgumentError, "sx must be > 0" unless x.positive? raise ArgumentError, "sy must be > 0" unless y.positive? ptr = FFIStruct::ImagePtr.new(::GD2::GD2FFI.send(create_image_sym, x, y)) raise MemoryAllocationError, "Could not allocation memory for image" if ptr.null? ::GD2::GD2FFI.send(:gdImageAlphaBlending, ptr, alpha_blending ? 1 : 0) ptr end |
.import(filename, options = {}) ⇒ Object
Import an image from a file with the given filename
. The :format option or the file extension is used to determine the image type (jpeg, png, gif, wbmp, gd, gd2, xbm, or xpm). The resulting image will be either of class Image::TrueColor or Image::IndexedColor.
If the file format is gd2, it is optionally possible to extract only a part of the image. Use options :x, :y, :width, and :height to specify the part of the image to import.
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# File 'lib/gd2/image.rb', line 141 def self.import(filename, = {}) raise Errno::ENOENT.new(filename) unless File.exist?(filename) unless format = .delete(:format) md = filename.match(/\.([^.]+)\z/) format = md ? md[1].downcase : nil end format = format.to_sym if format ptr = # TODO: implement xpm and xbm imports #if format == :xpm #raise ArgumentError, "Unexpected options #{options.inspect}" unless options.empty? #::GD2::GD2FFI.send(:gdImageCreateFromXpm, filename) #elsif format == :xbm #::GD2::GD2FFI.send(:gdImageCreateFromXbm, filename) if format == :gd2 && !.empty? x, y, width, height = .delete(:x) || 0, .delete(:y) || 0, .delete(:width) || .delete(:w), .delete(:height) || .delete(:h) raise ArgumentError, "Unexpected options #{.inspect}" unless .empty? raise ArgumentError, 'Missing required option :width' if width.nil? raise ArgumentError, 'Missing required option :height' if height.nil? # TODO: ptr = File.open(filename, 'rb') do |file| ::GD2::GD2FFI.send(:gdImageCreateFromGd2Part, file, x.to_i, y.to_i, width.to_i, height.to_i) end else raise ArgumentError, "Unexpected options #{.inspect}" unless .empty? create_sym = { :jpeg => :gdImageCreateFromJpegPtr, :jpg => :gdImageCreateFromJpegPtr, :png => :gdImageCreateFromPngPtr, :gif => :gdImageCreateFromGifPtr, :wbmp => :gdImageCreateFromWBMPPtr, :gd => :gdImageCreateFromGdPtr, :gd2 => :gdImageCreateFromGd2Ptr }[format] raise UnrecognizedImageTypeError, 'Format (or file extension) is not recognized' unless create_sym file = File.open(filename, 'rb').read file = file.force_encoding("ASCII-8BIT") if file.respond_to? :force_encoding file_ptr = FFI::MemoryPointer.new(file.size, 1, false) file_ptr.put_bytes(0, file) ::GD2::GD2FFI.send(create_sym, file.size, file_ptr) end raise LibraryError if ptr.null? ptr = FFIStruct::ImagePtr.new(ptr) image = (image_true_color?(ptr) ? TrueColor : IndexedColor).allocate.init_with_image(ptr) block_given? ? yield(image) : image end |
.load(src) ⇒ Object
Load an image from a file or a string. The image type is detected automatically (JPEG, PNG, GIF, WBMP, or GD2). The resulting image will be either of class Image::TrueColor or Image::IndexedColor.
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# File 'lib/gd2/image.rb', line 73 def self.load(src) src = src.force_encoding("ASCII-8BIT") if src.respond_to? :force_encoding case src when File pos = src.pos magic = src.read(4) src.pos = pos data = if FFI::Platform.windows? File.open(src.path, 'rb').read[pos..-1] else data = src.read end data = data.force_encoding("ASCII-8BIT") if data.respond_to? :force_encoding args = [ data.length, data ] when String magic = src.slice(0, 4) args = [ src.length, src ] else raise TypeError, 'Unexpected argument type' end create = { :jpeg => :gdImageCreateFromJpegPtr, :png => :gdImageCreateFromPngPtr, :gif => :gdImageCreateFromGifPtr, :wbmp => :gdImageCreateFromWBMPPtr, :gd2 => :gdImageCreateFromGd2Ptr } type = data_type(magic) or raise UnrecognizedImageTypeError, 'Image data format is not recognized' ptr = ::GD2::GD2FFI.send(create[type], *args) raise LibraryError if ptr.null? ptr = FFIStruct::ImagePtr.new(ptr) image = (image_true_color?(ptr) ? TrueColor : IndexedColor).allocate.init_with_image(ptr) block_given? ? yield(image) : image end |
.new(w, h) ⇒ Object Also known as: []
Create a new image of the specified dimensions. The default image class is Image::TrueColor; call this method on Image::IndexedColor instead if a palette image is desired.
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# File 'lib/gd2/image.rb', line 59 def self.new(w, h) image = (self == Image) ? TrueColor.new(w, h) : allocate.init_with_size(w, h) block_given? ? yield(image) : image end |
Instance Method Details
#==(other) ⇒ Object
Compare this image with another image. Returns false if the images are not identical.
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# File 'lib/gd2/image.rb', line 256 def ==(other) (compare(other) & CMP_IMAGE).zero? end |
#[](x, y) ⇒ Object
Return the color of the pixel at image location (x
, y
).
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# File 'lib/gd2/image.rb', line 302 def [](x, y) pixel2color(get_pixel(x, y)) end |
#[]=(x, y, color) ⇒ Object
Set the color of the pixel at image location (x
, y
).
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# File 'lib/gd2/image.rb', line 307 def []=(x, y, color) set_pixel(x, y, color2pixel(color)) end |
#alpha_blending=(bool) ⇒ Object
Set whether colors should be alpha blended with existing colors when pixels are modified. Alpha blending is not available for IndexedColor images.
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# File 'lib/gd2/image.rb', line 355 def alpha_blending=(bool) ::GD2::GD2FFI.send(:gdImageAlphaBlending, image_ptr, bool ? 1 : 0) end |
#alpha_blending? ⇒ Boolean
Return true if colors will be alpha blended into the image when pixels are modified. Returns false if colors will be copied verbatim into the image without alpha blending when pixels are modified.
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# File 'lib/gd2/image.rb', line 348 def alpha_blending? not image_ptr[:alphaBlendingFlag].zero? end |
#aspect ⇒ Object
Return the aspect ratio of this image, as a floating point ratio of the width to the height.
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# File 'lib/gd2/image.rb', line 285 def aspect width.to_f / height end |
#clipping ⇒ Object
Return the current clipping rectangle. Use Image#with_clipping to temporarily modify the clipping rectangle.
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# File 'lib/gd2/image.rb', line 386 def clipping x1 = FFI::MemoryPointer.new(:pointer) y1 = FFI::MemoryPointer.new(:pointer) x2 = FFI::MemoryPointer.new(:pointer) y2 = FFI::MemoryPointer.new(:pointer) ::GD2::GD2FFI.send(:gdImageGetClip, image_ptr, x1, y1, x2, y2) [ x1.read_int, y1.read_int, x2.read_int, y2.read_int ] end |
#clips?(x, y) ⇒ Boolean
Return true if the current clipping rectangle excludes the given point.
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# File 'lib/gd2/image.rb', line 411 def clips?(x, y) ::GD2::GD2FFI.send(:gdImageBoundsSafe, image_ptr, x.to_i, y.to_i).zero? end |
#color2pixel(color) ⇒ Object
Return a pixel value for the given color
object.
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# File 'lib/gd2/image.rb', line 329 def color2pixel(color) color.rgba end |
#compare(other) ⇒ Object
Compare this image with another image. Returns 0 if the images are identical, otherwise a bit field indicating the differences. See the GD2::CMP_* constants for individual bit flags.
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# File 'lib/gd2/image.rb', line 250 def compare(other) ::GD2::GD2FFI.send(:gdImageCompare, image_ptr, other.image_ptr) end |
#copy_from(other, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w = nil, src_h = nil) ⇒ Object
Copy a portion of another image to this image. If src_w
and src_h
are specified, the indicated portion of the source image will be resized (and resampled) to fit the indicated dimensions of the destination.
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# File 'lib/gd2/image.rb', line 551 def copy_from(other, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w = nil, src_h = nil) raise ArgumentError unless src_w.nil? == src_h.nil? if src_w ::GD2::GD2FFI.send(:gdImageCopyResampled, image_ptr, other.image_ptr, dst_x.to_i, dst_y.to_i, src_x.to_i, src_y.to_i, dst_w.to_i, dst_h.to_i, src_w.to_i, src_h.to_i) else ::GD2::GD2FFI.send(:gdImageCopy, image_ptr, other.image_ptr, dst_x.to_i, dst_y.to_i, src_x.to_i, src_y.to_i, dst_w.to_i, dst_h.to_i) end self end |
#copy_from_rotated(other, dst_x, dst_y, src_x, src_y, w, h, angle) ⇒ Object
Copy a portion of another image to this image, rotating the source portion first by the indicated angle
(in radians). The dst_x
and dst_y
arguments indicate the center of the desired destination, and may be floating point.
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# File 'lib/gd2/image.rb', line 568 def copy_from_rotated(other, dst_x, dst_y, src_x, src_y, w, h, angle) ::GD2::GD2FFI.send(:gdImageCopyRotated, image_ptr, other.image_ptr, dst_x.to_f, dst_y.to_f, src_x.to_i, src_y.to_i, w.to_i, h.to_i, angle.to_degrees.round.to_i) self end |
#crop(x, y, w, h) ⇒ Object
Like Image#crop! except a new image is returned.
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# File 'lib/gd2/image.rb', line 607 def crop(x, y, w, h) clone.crop!(x, y, w, h) end |
#crop!(x, y, w, h) ⇒ Object
Crop this image to the specified dimensions, such that (x
, y
) becomes (0, 0).
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# File 'lib/gd2/image.rb', line 600 def crop!(x, y, w, h) ptr = self.class.create_image_ptr(w, h, alpha_blending?) ::GD2::GD2FFI.send(:gdImageCopy, ptr, image_ptr, 0, 0, x.to_i, y.to_i, w.to_i, h.to_i) init_with_image(ptr) end |
#draw {|Canvas.new(self)| ... } ⇒ Object
Provide a drawing environment for a block. See GD2::Canvas.
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# File 'lib/gd2/image.rb', line 416 def draw #:yields: canvas yield Canvas.new(self) self end |
#dup ⇒ Object
Duplicate this image, copying all pixels to a new image. Contrast with Image#clone which produces a shallow copy and shares internal pixel data.
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# File 'lib/gd2/image.rb', line 243 def dup self.class.superclass.load(gd2(FMT_RAW)) end |
#each ⇒ Object
Iterate over each row of pixels in the image, returning an array of pixel values.
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# File 'lib/gd2/image.rb', line 313 def each (0...height).each do |y| row = (0...width).inject(Array.new(width)) do |r, x| r[x] = get_pixel(x, y) r end yield row end end |
#export(filename, options = {}) ⇒ Object
Export this image to a file with the given filename
. The image format is determined by the :format option, or by the file extension (jpeg, png, gif, wbmp, gd, or gd2). Returns the size of the written image data. Additional options
are as arguments for the Image#jpeg, Image#png, Image#wbmp, or Image#gd2 methods.
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# File 'lib/gd2/image.rb', line 433 def export(filename, = {}) unless format = .delete(:format) md = filename.match(/\.([^.]+)\z/) format = md ? md[1].downcase : nil end format = format.to_sym if format size = FFI::MemoryPointer.new(:pointer) case format when :jpeg, :jpg write_sym = :gdImageJpegPtr args = [ size, .delete(:quality) || -1 ] when :png write_sym = :gdImagePngPtrEx args = [ size, .delete(:level) || -1 ] when :gif write_sym = :gdImageGifPtr args = [ size ] when :wbmp write_sym = :gdImageWBMPPtr fgcolor = .delete(:fgcolor) raise ArgumentError, 'Missing required option :fgcolor' if fgcolor.nil? args = [size, color2pixel(fgcolor)] when :gd write_sym = :gdImageGdPtr args = [ size ] when :gd2 write_sym = :gdImageGd2Ptr args = [ .delete(:chunk_size) || 0, .delete(:fmt) || FMT_COMPRESSED, size ] else raise UnrecognizedImageTypeError, 'Format (or file extension) is not recognized' end raise ArgumentError, "Unrecognized options #{.inspect}" unless .empty? File.open(filename, 'wb') do |file| begin img = ::GD2::GD2FFI.send(write_sym, image_ptr, *args) file.write(img.get_bytes(0, size.get_int(0))) ensure ::GD2::GD2FFI.gdFree(img) end end end |
#gd ⇒ Object
Encode and return data for this image in ???.gd??? format. This is an internal format used by the gd library to quickly read and write images.
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# File 'lib/gd2/image.rb', line 529 def gd size = FFI::MemoryPointer.new(:pointer) ptr = ::GD2::GD2FFI.send(:gdImageGdPtr, image_ptr, size) ptr.get_bytes(0, size.get_int(0)) ensure ::GD2::GD2FFI.send(:gdFree, ptr) end |
#gd2(fmt = FMT_COMPRESSED, chunk_size = 0) ⇒ Object
Encode and return data for this image in ???.gd2??? format. This is an internal format used by the gd library to quickly read and write images. The specified fmt
may be either GD2::FMT_RAW or GD2::FMT_COMPRESSED.
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# File 'lib/gd2/image.rb', line 540 def gd2(fmt = FMT_COMPRESSED, chunk_size = 0) size = FFI::MemoryPointer.new(:pointer) ptr = ::GD2::GD2FFI.send(:gdImageGd2Ptr, image_ptr, chunk_size.to_i, fmt.to_i, size) ptr.get_bytes(0, size.get_int(0)) ensure ::GD2::GD2FFI.send(:gdFree, ptr) end |
#get_pixel(x, y) ⇒ Object Also known as: pixel
Return the pixel value at image location (x
, y
).
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# File 'lib/gd2/image.rb', line 290 def get_pixel(x, y) ::GD2::GD2FFI.send(:gdImageGetPixel, @image_ptr, x.to_i, y.to_i) end |
#gif ⇒ Object
Encode and return data for this image in GIF format. Note that GIF only supports palette images; TrueColor images will be automatically converted to IndexedColor internally in order to create the GIF. Use Image#to_indexed_color to control this conversion more precisely.
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# File 'lib/gd2/image.rb', line 507 def gif size = FFI::MemoryPointer.new(:pointer) ptr = ::GD2::GD2FFI.send(:gdImageGifPtr, image_ptr, size) ptr.get_bytes(0, size.get_int(0)) ensure ::GD2::GD2FFI.send(:gdFree, ptr) end |
#height ⇒ Object Also known as: h
Return the height of this image, in pixels.
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# File 'lib/gd2/image.rb', line 273 def height image_ptr[:sy] end |
#init_with_image(ptr) ⇒ Object
:nodoc:
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# File 'lib/gd2/image.rb', line 225 def init_with_image(ptr) #:nodoc: @image_ptr = if ptr.is_a?(FFIStruct::ImagePtr) ptr else FFIStruct::ImagePtr.new(ptr) end @palette = self.class.palette_class.new(self) unless defined?(@palette) && @palette.image == self self end |
#init_with_size(sx, sy) ⇒ Object
:nodoc:
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# File 'lib/gd2/image.rb', line 221 def init_with_size(sx, sy) #:nodoc: init_with_image self.class.create_image_ptr(sx, sy) end |
#inspect ⇒ Object
:nodoc:
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# File 'lib/gd2/image.rb', line 237 def inspect #:nodoc: "#<#{self.class} #{size.inspect}>" end |
#interlaced=(bool) ⇒ Object
Set whether this image will be stored in interlaced form when output as PNG or JPEG.
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# File 'lib/gd2/image.rb', line 341 def interlaced=(bool) ::GD2::GD2FFI.send(:gdImageInterlace, image_ptr, bool ? 1 : 0) end |
#interlaced? ⇒ Boolean
Return true if this image will be stored in interlaced form when output as PNG or JPEG.
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# File 'lib/gd2/image.rb', line 335 def interlaced? not image_ptr[:interlace].zero? end |
#jpeg(quality = nil) ⇒ Object
Encode and return data for this image in JPEG format. The quality
argument should be in the range 0???95, with higher quality values usually implying both higher quality and larger sizes.
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# File 'lib/gd2/image.rb', line 484 def jpeg(quality = nil) size = FFI::MemoryPointer.new(:pointer) ptr = ::GD2::GD2FFI.send(:gdImageJpegPtr, image_ptr, size, quality || -1) ptr.get_bytes(0, size.get_int(0)) ensure ::GD2::GD2FFI.send(:gdFree, ptr) end |
#merge_from(other, dst_x, dst_y, src_x, src_y, w, h, pct) ⇒ Object
Merge a portion of another image into this one by the amount specified as pct
(a percentage). A percentage of 1.0 is identical to Image#copy_from; a percentage of 0.0 is a no-op. Note that alpha channel information from the source image is ignored.
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# File 'lib/gd2/image.rb', line 578 def merge_from(other, dst_x, dst_y, src_x, src_y, w, h, pct) ::GD2::GD2FFI.send(:gdImageCopyMerge, image_ptr, other.image_ptr, dst_x.to_i, dst_y.to_i, src_x.to_i, src_y.to_i, w.to_i, h.to_i, pct.to_percent.round.to_i) self end |
#optimize_palette ⇒ Object
Consolidate duplicate colors in this image, and eliminate all unused palette entries. This only has an effect on IndexedColor images, and is rather expensive. Returns the number of palette entries deallocated.
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# File 'lib/gd2/image.rb', line 424 def optimize_palette # implemented by subclass end |
#pixel2color(pixel) ⇒ Object
Return a Color object for the given pixel
value.
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# File 'lib/gd2/image.rb', line 324 def pixel2color(pixel) Color.new_from_rgba(pixel) end |
#png(level = nil) ⇒ Object
Encode and return data for this image in PNG format. The level
argument should be in the range 0???9 indicating the level of lossless compression (0 = none, 1 = minimal but fast, 9 = best but slow).
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# File 'lib/gd2/image.rb', line 495 def png(level = nil) size = FFI::MemoryPointer.new(:pointer) ptr = ::GD2::GD2FFI.send(:gdImagePngPtrEx, image_ptr, size, level.to_i || -1) ptr.get_bytes(0, size.get_int(0)) ensure ::GD2::GD2FFI.send(:gdFree, ptr) end |
#polar_transform(radius) ⇒ Object
Like Image#polar_transform! except a new image is returned.
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# File 'lib/gd2/image.rb', line 655 def polar_transform(radius) clone.polar_transform!(radius) end |
#polar_transform!(radius) ⇒ Object
Transform this image into a new image of width and height radius
??????2, in which the X axis of the original has been remapped to ?? (angle) and the Y axis of the original has been remapped to ?? (distance from center). Note that the original image must be square.
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# File 'lib/gd2/image.rb', line 647 def polar_transform!(radius) raise 'Image must be square' unless width == height ptr = ::GD2::GD2FFI.send(:gdImageSquareToCircle, image_ptr, radius.to_i) raise LibraryError if ptr.null? init_with_image(ptr) end |
#resize(w, h, resample = true) ⇒ Object
Like Image#resize! except a new image is returned.
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# File 'lib/gd2/image.rb', line 639 def resize(w, h, resample = true) clone.resize!(w, h, resample) end |
#resize!(w, h, resample = true) ⇒ Object
Resize this image to the given dimensions. If resample
is true, the image pixels will be resampled; otherwise they will be stretched or shrunk as necessary without resampling.
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# File 'lib/gd2/image.rb', line 628 def resize!(w, h, resample = true) ptr = self.class.create_image_ptr(w, h, false) ::GD2::GD2FFI.send(resample ? :gdImageCopyResampled : :gdImageCopyResized, ptr, image_ptr, 0, 0, 0, 0, w.to_i, h.to_i, width.to_i, height.to_i) alpha_blending = alpha_blending? init_with_image(ptr) self.alpha_blending = alpha_blending self end |
#rotate(angle, axis_x = width / 2.0, axis_y = height / 2.0) ⇒ Object
Like Image#rotate! except a new image is returned.
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# File 'lib/gd2/image.rb', line 594 def rotate(angle, axis_x = width / 2.0, axis_y = height / 2.0) clone.rotate!(angle, axis_x, axis_y) end |
#rotate!(angle, axis_x = width / 2.0, axis_y = height / 2.0) ⇒ Object
Rotate this image by the given angle
(in radians) about the given axis coordinates. Note that some of the edges of the image may be lost.
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# File 'lib/gd2/image.rb', line 586 def rotate!(angle, axis_x = width / 2.0, axis_y = height / 2.0) ptr = self.class.create_image_ptr(width, height, alpha_blending?) ::GD2::GD2FFI.send(:gdImageCopyRotated, ptr, image_ptr, axis_x.to_f, axis_y.to_f, 0, 0, width.to_i, height.to_i, angle.to_degrees.round.to_i) init_with_image(ptr) end |
#save_alpha=(bool) ⇒ Object
Set whether this image will be stored with full alpha channel information when output as PNG.
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# File 'lib/gd2/image.rb', line 367 def save_alpha=(bool) ::GD2::GD2FFI.send(:gdImageSaveAlpha, image_ptr, bool ? 1 : 0) end |
#save_alpha? ⇒ Boolean
Return true if this image will be stored with full alpha channel information when output as PNG.
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# File 'lib/gd2/image.rb', line 361 def save_alpha? not image_ptr[:saveAlphaFlag].zero? end |
#set_pixel(x, y, value) ⇒ Object
Set the pixel value at image location (x
, y
).
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# File 'lib/gd2/image.rb', line 296 def set_pixel(x, y, value) ::GD2::GD2FFI.send(:gdImageSetPixel, @image_ptr, x.to_i, y.to_i, value.to_i) nil end |
#sharpen(pct) ⇒ Object
Sharpen this image by pct
(a percentage) which can be greater than 1.0. Transparency/alpha channel are not altered. This has no effect on IndexedColor images.
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# File 'lib/gd2/image.rb', line 662 def sharpen(pct) self end |
#size ⇒ Object
Return the size of this image as an array [width, height], in pixels.
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# File 'lib/gd2/image.rb', line 279 def size [width, height] end |
#to_indexed_color(colors = MAX_COLORS, dither = true) ⇒ Object
Return this image as an IndexedColor image, creating a copy if necessary. colors
indicates the maximum number of palette colors to use, and dither
controls whether dithering is used.
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# File 'lib/gd2/image.rb', line 674 def to_indexed_color(colors = MAX_COLORS, dither = true) ptr = ::GD2::GD2FFI.send(:gdImageCreatePaletteFromTrueColor, to_true_color.image_ptr, dither ? 1 : 0, colors.to_i) raise LibraryError if ptr.null? obj = IndexedColor.allocate.init_with_image(ptr) # fix for gd bug where image->open[] is not properly initialized (0...obj.image_ptr[:colorsTotal]).each do |i| obj.image_ptr[:open][i] = 0 end obj end |
#to_true_color ⇒ Object
Return this image as a TrueColor image, creating a copy if necessary.
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# File 'lib/gd2/image.rb', line 667 def to_true_color self end |
#transparent ⇒ Object
Return the transparent color for this image, or nil if none has been set.
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# File 'lib/gd2/image.rb', line 373 def transparent pixel = image_ptr[:transparent] pixel == -1 ? nil : pixel2color(pixel) end |
#transparent=(color) ⇒ Object
Set or unset the transparent color for this image.
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# File 'lib/gd2/image.rb', line 379 def transparent=(color) ::GD2::GD2FFI.send(:gdImageColorTransparent, image_ptr, color.nil? ? -1 : color2pixel(color)) end |
#true_color? ⇒ Boolean
Return true if this image is a TrueColor image.
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# File 'lib/gd2/image.rb', line 261 def true_color? kind_of?(TrueColor) # self.class.image_true_color?(image_ptr) end |
#uncrop(x1, y1 = x1, x2 = x1, y2 = y1) ⇒ Object
Like Image#uncrop! except a new image is returned.
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# File 'lib/gd2/image.rb', line 621 def uncrop(x1, y1 = x1, x2 = x1, y2 = y1) clone.uncrop!(x1, y1, x2, y2) end |
#uncrop!(x1, y1 = x1, x2 = x1, y2 = y1) ⇒ Object
Expand the left, top, right, and bottom borders of this image by the given number of pixels.
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# File 'lib/gd2/image.rb', line 613 def uncrop!(x1, y1 = x1, x2 = x1, y2 = y1) ptr = self.class.create_image_ptr(x1 + width + x2, y1 + height + y2, alpha_blending?) ::GD2::GD2FFI.send(:gdImageCopy, ptr, image_ptr, x1.to_i, y1.to_i, 0, 0, width.to_i, height.to_i) init_with_image(ptr) end |
#wbmp(fgcolor) ⇒ Object
Encode and return data for this image in WBMP format. WBMP currently supports only black and white images; the specified fgcolor
will be used as the foreground color (black), and all other colors will be considered ???background??? (white).
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# File 'lib/gd2/image.rb', line 519 def wbmp(fgcolor) size = FFI::MemoryPointer.new(:pointer) ptr = ::GD2::GD2FFI.send(:gdImageWBMPPtr, image_ptr, size, color2pixel(fgcolor)) ptr.get_bytes(0, size.get_int(0)) ensure ::GD2::GD2FFI.send(:gdFree, ptr) end |
#width ⇒ Object Also known as: w
Return the width of this image, in pixels.
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# File 'lib/gd2/image.rb', line 267 def width image_ptr[:sx] end |
#with_clipping(x1, y1, x2, y2) ⇒ Object
Temporarily set the clipping rectangle during the execution of a block. Pixels outside this rectangle will not be modified by drawing or copying operations.
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# File 'lib/gd2/image.rb', line 399 def with_clipping(x1, y1, x2, y2) #:yields: image clip = clipping begin ::GD2::GD2FFI.send(:gdImageSetClip, image_ptr, x1.to_i, y1.to_i, x2.to_i, y2.to_i) yield self self ensure ::GD2::GD2FFI.send(:gdImageSetClip, image_ptr, *clip) end end |