Class: Painter

Inherits:
Object
  • Object
show all
Defined in:
lib/painter.rb,
lib/painter/cgd2.rb,
lib/painter/line.rb,
lib/painter/rect.rb,
lib/painter/text.rb,
lib/painter/color.rb,
lib/painter/pixel.rb,
lib/painter/point.rb,
lib/painter/stdio.rb,
lib/painter/operation.rb,
lib/painter/image_struct.rb

Defined Under Namespace

Modules: CGD2, Stdio Classes: Color, ImageStruct, Line, Operation, Pixel, Point, Rect, Text

Constant Summary collapse

ALPHA_MAX = 
127
ALPHA_OPAQUE = 
0
ALPHA_TRANSPARENT = 
127
RGB_MAX = 
255
FORMAT_TO_FUNCTION = 
{
  'jpg' => :gdImageCreateFromJpeg,
  'png'  => :gdImageCreateFromPng,
  'gif'  => :gdImageCreateFromGif,
  'gd'   => :gdImageCreateFromGd,
  'gd2'  => :gdImageCreateFromGd2,
  'wbmp' => :gdImageCreateFromWBMP,
  'xbm'  => :gdImageCreateFromXbm
}
OUTPUT_FORMAT_TO_FUNCTION = 
{
  'gif'  => :gdImageGifPtr,
  'jpeg' => :gdImageJpegPtr,
  'jpg'  => :gdImageJpegPtr,
  'png'  => :gdImagePngPtr,
  'wbmp' => :gdImageWBMPPtr,
  'gd'   => :gdImageGdPtr,
  'gd2'  => :gdImageGd2
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#image_pointer ⇒ Object (readonly)

Returns the value of attribute image_pointer.



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# File 'lib/painter.rb', line 17

def image_pointer
  @image_pointer
end

Class Method Details

.open(path, format = nil) ⇒ Object 



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# File 'lib/painter.rb', line 32

def self.open(path, format = nil)
  instance = new
  instance.initializeFromOpen(path, format)
  yield instance
ensure
  instance.release!
end

.write(path, x, y, file_format) ⇒ Object 



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# File 'lib/painter.rb', line 19

def self.write(path, x, y, file_format)
  instance = new
  instance.initializeFromCreate(x,y)
  yield instance
  File.open(path, 'w') do |f|
    instance.format(file_format) do |data|
      f.write data
    end
  end
ensure
  instance.release!
end

Instance Method Details

#degrees(n) ⇒ Object 



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# File 'lib/painter.rb', line 44

def degrees(n)
  n * 2 * Math::PI / 360
end

#format(file_format, quality = 100) ⇒ Object 



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# File 'lib/painter.rb', line 115

def format(file_format, quality = 100)
  size = FFI::MemoryPointer.new(:pointer)
  function_name = OUTPUT_FORMAT_TO_FUNCTION[file_format.to_s]
  raise "Unknown format: #{file_format}" unless function_name
  args = [@image_pointer, size]
  if function_name == :gdImageJpegPtr
    args << quality
  end
  begin
    ip = CGD2.send(function_name, *args)
    size = size.get_int(0)
    data = ip.get_bytes(0, size)
    yield data
  ensure
    CGD2::gdFree(ip)
  end
end

#format_from_filename(path) ⇒ Object 



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# File 'lib/painter.rb', line 72

def format_from_filename(path)
  path[/\.([^.]*)$/, 1].downcase
end

#info ⇒ Object 



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# File 'lib/painter.rb', line 85

def info
  @info ||= Painter::ImageStruct.new @image_pointer
end

#initializeFromCreate(x, y, options = {}) ⇒ Object 



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# File 'lib/painter.rb', line 57

def initializeFromCreate(x, y, options = {})
  @image_pointer = FFI::Pointer.new(CGD2::gdImageCreateTrueColor(x, y))
end

#initializeFromOpen(path, format = nil) ⇒ Object 



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# File 'lib/painter.rb', line 76

def initializeFromOpen(path, format = nil)
  f = Painter::Stdio.fopen(path, "rb")
  format ||= format_from_filename(path)
  function_name = FORMAT_TO_FUNCTION[format.to_s]
  raise "Unknown format: #{format}" unless function_name
  @image_pointer = CGD2.send(function_name, f)
  Painter::Stdio.fclose(f)
end

#release(ptr) ⇒ Object 



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# File 'lib/painter.rb', line 53

def release(ptr)
  CGD2::gdImageDestroy(ptr)
end

#release! ⇒ Object 



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# File 'lib/painter.rb', line 40

def release!
  CGD2::gdImageDestroy(@image_pointer)
end

#resize_to(destination) ⇒ Object 



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# File 'lib/painter.rb', line 100

def resize_to(destination)
  CGD2::gdImageCopyResampled(destination.image_pointer, self.image_pointer,
    0, 0, 0, 0,
    destination.info.x, destination.info.y, self.info.x, self.info.y)
end