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d3d11screencapturesrc: Fix mouse cursor blending

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Ignore alpha component of source (mouse cursor texture)
when blending alpha channel, otherwise the background area of source
(which has zeros) will be written to render target. Then it will result
in black rectangle if output texture is converted to premultiplied alpha
texture

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5577>
This commit is contained in:
Seungha Yang 2023-10-28 01:23:36 +09:00 committed by Tim-Philipp Müller
parent 96326904f9
commit 7171849c3e
1 changed files with 2 additions and 2 deletions
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4
subprojects/gst-plugins-bad/sys/d3d11/gstd3d11screencapturesrc.cpp
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@ -890,8 +890,8 @@ gst_d3d11_screen_capture_prepare_shader (GstD3D11ScreenCaptureSrc * self)
blend_desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
blend_desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
blend_desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
blend_desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE;
blend_desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
blend_desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ZERO;
blend_desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ONE;
blend_desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
blend_desc.RenderTarget[0].RenderTargetWriteMask =
D3D11_COLOR_WRITE_ENABLE_ALL;