Module: RbSDL2::Window::Shape

Included in:
RbSDL2::Window
Defined in:
lib/rb_sdl2/window/shape.rb

Defined Under Namespace

Classes: WindowShapeMode

Instance Method Summary collapse

Instance Method Details

#alpha_test ⇒ Object 



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# File 'lib/rb_sdl2/window/shape.rb', line 45

def alpha_test = shaped? && alpha_test? ? shape_mode.alpha_test : nil

#alpha_test? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rb_sdl2/window/shape.rb', line 47

def alpha_test? = shaped? && shape_mode.alpha_test?

#color_key ⇒ Object 



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# File 'lib/rb_sdl2/window/shape.rb', line 49

def color_key = shaped? && color_key? ? shape_mode.color_key : nil

#color_key? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rb_sdl2/window/shape.rb', line 51

def color_key? = shaped? && shape_mode.color_key?

#reverse_alpha_test? ⇒ Boolean

Returns:

  • (Boolean) 


53
 
# File 'lib/rb_sdl2/window/shape.rb', line 53

def reverse_alpha_test? = shaped? && shape_mode.reverse_alpha_test?

#shape_set(surface, alpha_test: nil, color_key: nil) ⇒ Object

サーフェスにアルファ―チャンネルが含まれていない場合、color_key オプションを与える必要がある。 形状マスクの設定を行う。ウィンドウの描画域は透明なピクセルで埋められている。 このメソッド呼び出しの成功後にウィンドウのサーフェスへ描画を行う必要がある。 描画方法はウィンドウのサーフェスまたはレンダラーのどちらを使用してもよい。



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# File 'lib/rb_sdl2/window/shape.rb', line 59

def shape_set(surface, alpha_test: nil, color_key: nil)
  shape = WindowShapeMode.new
  if color_key
    shape.mode = ::SDL::ShapeModeColorKey
    shape.color_key = color_key
  elsif alpha_test&.>= 0
    shape.mode = ::SDL::ShapeModeBinarizeAlpha
    shape.alpha_test = alpha_test
  elsif alpha_test&.< 0
    shape.mode = ::SDL::ShapeModeReverseBinarizeAlpha
    shape.alpha_test = alpha_test.abs
  else
    shape.mode = ::SDL::ShapeModeDefault
  end
  err = ::SDL.SetWindowShape(self, surface, shape)
  # SetWindowShape は WINDOW_LACKS_SHAPE を返すことはない。
  if err == ::SDL::NONSHAPEABLE_WINDOW
    raise RbSDL2Error, "unshaped window"
  elsif err == ::SDL::INVALID_SHAPE_ARGUMENT
    raise RbSDL2Error,
          "Invalid shape argument. \
The size of the window and the size of the surface do not match. \
Or the color key is not specified in the surface without alpha channel."
  elsif err < 0
    raise RbSDL2Error
  end
  surface
end

#shaped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rb_sdl2/window/shape.rb', line 88

def shaped? = ::SDL.IsShapedWindow(self) == ::SDL::TRUE