Module: RbSDL2::Window::Shape

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

Instance Method Summary collapse

Instance Method Details

#alpha_test ⇒ Object 



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# File 'lib/rb_sdl2/window/shape.rb', line 18

def alpha_test
  shape_mode[:parameters][:binarizationCutoff] unless shaped? && color_key?
end

#alpha_test? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rb_sdl2/window/shape.rb', line 22

def alpha_test?
  shaped? && [::SDL2::ShapeModeBinarizeAlpha,
              ::SDL2::ShapeModeDefault].include?(shape_mode[:mode])
end

#color_key ⇒ Object 



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# File 'lib/rb_sdl2/window/shape.rb', line 27

def color_key
  shape_mode[:parameters][:colorKey].values if shaped? && color_key?
end

#color_key? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rb_sdl2/window/shape.rb', line 31

def color_key?
  shaped? && ::SDL2::ShapeModeColorKey == shape_mode[:mode]
end

#reverse_alpha_test? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rb_sdl2/window/shape.rb', line 35

def reverse_alpha_test?
  shaped? && ::SDL2::ShapeModeReverseBinarizeAlpha == shape_mode[:mode]
end

#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 43

def shape_set(surface, alpha_test: nil, color_key: nil)
  mode = ::SDL2::SDL_WindowShapeMode.new.tap do |st|
    st[:mode] = if color_key
                  st[:parameters][:colorKey].tap { |c| c[:r], c[:g], c[:b] = color_key }
                  ::SDL2::ShapeModeColorKey
                elsif alpha_test&.>= 0
                  st[:parameters][:binarizationCutoff] = alpha_test
                  ::SDL2::ShapeModeBinarizeAlpha
                elsif alpha_test&.< 0
                  st[:parameters][:binarizationCutoff] = alpha_test.abs
                  ::SDL2::ShapeModeReverseBinarizeAlpha
                else
                  ::SDL2::ShapeModeDefault
                end
  end
  err = ::SDL2.SDL_SetWindowShape(self, surface, mode)
  # SDL_SetWindowShape は SDL_WINDOW_LACKS_SHAPE を返すことはない。

  if err == ::SDL2::SDL_NONSHAPEABLE_WINDOW
    raise RbSDL2Error, "unshaped window"
  elsif err == ::SDL2::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 73

def shaped? = ::SDL2.SDL_IsShapedWindow(self) == ::SDL2::SDL_TRUE