Class: EZDraw::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/ezdraw.rb

Constant Summary collapse

@@instances = 
[]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(img_filename) ⇒ Image

Returns a new instance of Image.



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# File 'lib/ezdraw.rb', line 391

def initialize(img_filename)
 EZDraw.requires_init
 
 @sfc = SDL2::Image.IMG_Load(img_filename)
 raise "IMG_Load: #{SDL2::Image.IMG_GetError}" if @sfc.null?

 @dflag = [false] #shared-changable
 ObjectSpace.define_finalizer(self, proc {|id|
  self.class._destroy(@sfc, @dflag)
 })
 
 @@instances << self
end

Instance Attribute Details

#sfc ⇒ Object (readonly)

Returns the value of attribute sfc.



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# File 'lib/ezdraw.rb', line 405

def sfc
  @sfc
end

Class Method Details

._destroy(sfc, dflag) ⇒ Object 



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# File 'lib/ezdraw.rb', line 422

def self._destroy(sfc, dflag)
 if dflag[0]
  #EZDraw.logger.debug "(already destroyed image #{sfc})"
  return
 end
 EZDraw.logger.debug "destroy image #{sfc}"

 SDL2.SDL_FreeSurface(sfc)
 dflag[0] = true
end

.cleanup ⇒ Object 



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# File 'lib/ezdraw.rb', line 415

def self.cleanup
 EZDraw.requires_init
 @@instances.each {|img| img.close}
 @@instances = []
 SDL2::Image.IMG_Quit
end

.init ⇒ Object 



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# File 'lib/ezdraw.rb', line 407

def self.init
 iflags = SDL2::Image::IMG_INIT_JPG |
   SDL2::Image::IMG_INIT_PNG |
   SDL2::Image::IMG_INIT_TIF
 oflags = SDL2::Image.IMG_Init(iflags)
 raise "IMG_Init: #{SDL2::Image.IMG_GetError}" if (oflags & iflags) != iflags
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/ezdraw.rb', line 433

def close
 self.class._destroy(@sfc, @dflag)
end

#height ⇒ Object 



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# File 'lib/ezdraw.rb', line 441

def height
 @sfc[:h]
end

#width ⇒ Object 



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# File 'lib/ezdraw.rb', line 437

def width
 @sfc[:w]
end