d3d11: Various fix/improvement/cleanup of conversion element
d3d11converter: Implement filling border color
Equivalent to GST_VIDEO_CONVERTER_OPT_BORDER_ARGB and
GST_VIDEO_CONVERTER_OPT_FILL_BORDER options of GstVideoConverter
d3d11converter: Objectify converter
... and set conversion options via property
d3d11shader: Remove GstD3D11Quad helper object
It's not very generic to be used for various scenario. Use native D3D11
APIs directly instead.
d3d11compositor: Don't use GstD3D11Quad
The helper object will be removed
d3d11overlaycompositor: Fix HLSL compiler warning
warning X3206: 'Sample': implicit truncation of vector type
And don't use GstD3D11Quad since it will result in redundant API calls