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compositor: Revert most of previous patch.

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The calculation doesn't produce the same results.
Keep just the change to divide alpha by 255 instead of 256,
for slightly better accuracy
This commit is contained in:
Jan Schmidt 2015-03-16 03:53:33 +11:00
parent 6a1f97cd50
commit d9a96ac2ec
1 changed files with 7 additions and 21 deletions
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28
gst/compositor/compositororc.orc
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@ -17,7 +17,7 @@ copyl d1, s1
.param 2 p1
.temp 2 t1
.temp 2 t2
.const 1 c1 8
.const 1 c1 8
convubw t1, d1
convubw t2, s1
@ -35,7 +35,6 @@ convsuswb d1, t2
.source 4 s guint8
.param 2 alpha
.temp 4 t
.temp 4 t2
.temp 2 tw
.temp 1 tb
.temp 4 a
@ -51,25 +50,14 @@ splatbl a, tb
x4 convubw a_wide, a
x4 mullw a_wide, a_wide, alpha
x4 div255w a_wide, a_wide
# dest pixel into t2
loadl t2, d
# t = s - d (as bytes)
x4 subb t, t, t2
# s_wide = (uint16)(t) * alpha
x4 convubw s_wide, t
loadl t, d
x4 convubw d_wide, t
x4 subw s_wide, s_wide, d_wide
x4 mullw s_wide, s_wide, a_wide
# s_wide /= 255
x4 div255w s_wide, s_wide
# d_wide = (uint16)(dest) + s_wide
x4 convubw d_wide, t2
x4 addw d_wide, d_wide, s_wide
# Set output alpha to 0xff and store
x4 convwb t, d_wide
orl t, t, a_alpha
storel d, t
@ -98,15 +86,13 @@ x4 convubw a_wide, a
x4 mullw a_wide, a_wide, alpha
x4 div255w a_wide, a_wide
loadl t2, d
# t = s - d (as bytes)
x4 subb t, t, t2
x4 convubw s_wide, t
loadl t, d
x4 convubw d_wide, t
x4 subw s_wide, s_wide, d_wide
x4 mullw s_wide, s_wide, a_wide
x4 div255w s_wide, s_wide
x4 convubw d_wide, t2
x4 addw d_wide, d_wide, s_wide
x4 convwb t, d_wide
orl t, t, a_alpha