Method bitmapForDPI

graphicseffects.go:43–110

(dpi int)

}

func (wgeb *widgetGraphicsEffectBase) bitmapForDPI(dpi int) (*Bitmap, error) {
	if wgeb.dpi2Bitmap == nil {
		wgeb.dpi2Bitmap = make(map[int]*Bitmap)
	} else if bitmap, ok := wgeb.dpi2Bitmap[dpi]; ok {
		return bitmap, nil
	}

	var disposables Disposables
	defer disposables.Treat()

	bitmap, err := NewBitmapWithTransparentPixelsForDPI(SizeFrom96DPI(Size{12, 12}, dpi), dpi)
	if err != nil {
		return nil, err
	}
	disposables.Add(bitmap)

	canvas, err := NewCanvasFromImage(bitmap)
	if err != nil {
		return nil, err
	}
	defer canvas.Dispose()

	for i := 1; i <= 5; i++ {
		size := SizeFrom96DPI(Size{i*2 + 2, i*2 + 2}, dpi)

		bmp, err := NewBitmapWithTransparentPixelsForDPI(size, dpi)
		if err != nil {
			return nil, err
		}
		defer bmp.Dispose()

		bmpCanvas, err := NewCanvasFromImage(bmp)
		if err != nil {
			return nil, err
		}
		defer bmpCanvas.Dispose()

		color := RGB(
			byte(math.Min(1.0, float64(wgeb.color.R())/255.0-0.1+0.1*float64(i))*255.0),
			byte(math.Min(1.0, float64(wgeb.color.G())/255.0-0.1+0.1*float64(i))*255.0),
			byte(math.Min(1.0, float64(wgeb.color.B())/255.0-0.1+0.1*float64(i))*255.0),
		)

		brush, err := NewSolidColorBrush(color)
		if err != nil {
			return nil, err
		}
		defer brush.Dispose()

		ellipseSize := SizeFrom96DPI(Size{i * 2, i * 2}, dpi)
		if err := bmpCanvas.FillRoundedRectanglePixels(brush, Rectangle{0, 0, size.Width, size.Height}, ellipseSize); err != nil {
			return nil, err
		}

		bmpCanvas.Dispose()

		opacity := byte(borderGlowAlpha[i-1] * 255.0)