Method RenderBackground

Xaml/Controls/ColorPickerSlider.cpp:220–251

	}

	fire_and_forget ColorPickerSlider::RenderBackground(weak_ref<wux::Shapes::Rectangle> rect_weak, txmp::HsvColor color, wuxc::Orientation orientation, int32_t width, int32_t height, double renderScale)
	{
		// retrieve properties before going to the background
		const auto representation = ColorRepresentation();
		const auto channel = ColorChannel();
		const auto background = CheckerBackgroundColor();
		const auto alphaMaxForced = IsAlphaMaxForced();
		const auto saturationMaxForced = IsSaturationValueMaxForced();

		// create the bitmap on this thread
		wux::Media::Imaging::WriteableBitmap bitmap { width, height };
		const auto buffer = bitmap.PixelBuffer();
		const auto bgraPixelData = buffer.data();

		// move to background
		const auto dispatcher = Windows::System::DispatcherQueue::GetForCurrentThread();
		co_await resume_background();

		FillChannelBitmap(bgraPixelData, width, height, renderScale, orientation, representation, channel, color, background, alphaMaxForced, saturationMaxForced);

		if (const auto rect = rect_weak.get())
		{
			// return to main thread
			co_await wil::resume_foreground(dispatcher);

			bitmap.Invalidate();
			wux::Media::ImageBrush brush;
			brush.ImageSource(bitmap);
			brush.Stretch(wux::Media::Stretch::Fill);
			rect.Fill(brush);
		}
	}
}