Cool_Tools/bemaniutils
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Fix non-alpha blended modes now that I have an example file.

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This commit is contained in:
Jennifer Taylor 2021-05-19 02:00:05 +00:00
parent d59fec65f7
commit b02c4292be
1 changed files with 10 additions and 11 deletions
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21
bemani/format/afp/blend.py
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@ -22,7 +22,10 @@ def blend_normal(
) -> Sequence[int]:
# "Normal" blend mode, which is just alpha blending. Various games use the DX
# equation Src * As + Dst * (1 - As). We premultiply Dst by Ad as well, since
# we are blitting onto a destination that could have transparency.
# we are blitting onto a destination that could have transparency. Once we are
# done, we divide out the premultiplied Ad in order to put the pixes back to
# their full blended values since we are not setting the destination alpha to 1.0.
# This enables partial transparent backgrounds to work properly.
# Calculate multiplicative and additive colors against the source.
src = (
@ -77,13 +80,13 @@ def blend_addition(
if src[3] == 0:
return dest
# Calculate alpha blending.
# Calculate final color blending.
srcpercent = src[3] / 255.0
return (
clamp(dest[0] + (src[0] * srcpercent)),
clamp(dest[1] + (src[1] * srcpercent)),
clamp(dest[2] + (src[2] * srcpercent)),
clamp(dest[3] + (255 * srcpercent)),
dest[3],
)
@ -113,13 +116,13 @@ def blend_subtraction(
if src[3] == 0:
return dest
# Calculate alpha blending.
# Calculate final color blending.
srcpercent = src[3] / 255.0
return (
clamp(dest[0] - (src[0] * srcpercent)),
clamp(dest[1] - (src[1] * srcpercent)),
clamp(dest[2] - (src[2] * srcpercent)),
clamp(dest[3] - (255 * srcpercent)),
dest[3],
)
@ -146,16 +149,12 @@ def blend_multiply(
clamp((src[3] * mult_color.a) + add_color[3]),
)
# Short circuit for speed.
if src[3] == 0:
return dest
# Calculate alpha blending.
# Calculate final color blending.
return (
clamp(255 * ((dest[0] / 255.0) * (src[0] / 255.0))),
clamp(255 * ((dest[1] / 255.0) * (src[1] / 255.0))),
clamp(255 * ((dest[2] / 255.0) * (src[2] / 255.0))),
clamp(255 * ((dest[3] / 255.0) * (src[3] / 255.0))),
dest[3],
)