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vo_opengl: blend transparent video against tiles by default

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Add a "blend-tiles" choice to the "alpha" sub-option. This is pretty
simplistic and uses the GL raster position to derive the tiles. A weird
consequence is that using --vo=opengl and --vo=opengl-hq gives different
scaling behavior (screenspace pixel size vs. source video pixel size
16x16 tiles), but it seems we don't have easy access to the original
texture coordinates. Using the rasterpos is probably simpler.

Make this option the default.
This commit is contained in:
wm4
2015-12-22 23:14:47 +01:00
parent 3de6c9aa42
commit eac0665b8d
2 changed files with 13 additions and 6 deletions
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6
DOCS/man/vo.rst
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@@ -957,9 +957,11 @@ Available video output drivers are:
things like softsubbed ASS signs to match the video colors,
but may cause SRT subtitles or similar to look slightly off.
``alpha=<blend|yes|no>``
Decides what to do if the input has an alpha component (default: blend).
``alpha=<blend-tiles|blend|yes|no>``
Decides what to do if the input has an alpha component.
blend-tiles
Blend the frame against a 16x16 gray/white tiles background (default).
blend
Blend the frame against a black background.
yes