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More inclusive low pass filter for color match look ahead

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This commit is contained in:
David Schmenk 2024-12-07 11:57:59 -08:00
parent 2a9e506fa2
commit 99bbca0264
1 changed files with 24 additions and 23 deletions
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47
src/dhgr.tk/utils/dhgrrgb.pla
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@ -118,34 +118,35 @@ def rgbPix(rgbptr, errptr, cx)#1
dist(r0, g0, b0, r1, g1, b1)
if isgti16(rgbThreshold)
d1:[0], d1:[1] = pd:[0], pd:[1]
d2:[0], d2:[1] = pd:[0], pd:[1]
else
// Calc match if next pixel is one
d1:[0], d1:[1] = dist(r1, g1, b1, lr1, lg1, lb1)
fin
if lookahead > 1
// Look ahead in chroma cycle for possible better match for after next RGB pixel
i = ((cx + 2) & 3) * 3
lr2 = pr1 + ntscChroma[i+RED]
lg2 = pg1 + ntscChroma[i+GRN]
lb2 = pb1 + ntscChroma[i+BLU]
r2 = gamma[rgbptr->[6+RED]]
g2 = gamma[rgbptr->[6+GRN]]
b2 = gamma[rgbptr->[6+BLU]]
if errDiv
r2 = r2 + (errptr=>[6+RED] + r1 - lr2) / errDiv
g2 = g2 + (errptr=>[6+GRN] + g1 - lg2) / errDiv
b2 = b2 + (errptr=>[6+BLU] + b1 - lb2) / errDiv
fin
// Check for hi frequency transition
dist(r0, g0, b0, r2, g2, b2)
if isgti16(rgbThreshold)
d2:[0], d2:[1] = pd:[0], pd:[1]
if lookahead > 1
// Look ahead in chroma cycle for possible better match for after next RGB pixel
i = ((cx + 2) & 3) * 3
lr2 = pr1 + ntscChroma[i+RED]
lg2 = pg1 + ntscChroma[i+GRN]
lb2 = pb1 + ntscChroma[i+BLU]
r2 = gamma[rgbptr->[6+RED]]
g2 = gamma[rgbptr->[6+GRN]]
b2 = gamma[rgbptr->[6+BLU]]
if errDiv
r2 = r2 + (errptr=>[6+RED] + r1 - lr2) / errDiv
g2 = g2 + (errptr=>[6+GRN] + g1 - lg2) / errDiv
b2 = b2 + (errptr=>[6+BLU] + b1 - lb2) / errDiv
fin
// Check for hi frequency transition
dist(r0, g0, b0, r2, g2, b2)
if isgti16(rgbThreshold)
d2:[0], d2:[1] = pd:[0], pd:[1]
else
// Calc match if after next pixel is one
d2:[0], d2:[1] = dist(r2, g2, b2, lr2, lg2, lb2)
fin
else
// Calc match if after next pixel is one
d2:[0], d2:[1] = dist(r2, g2, b2, lr2, lg2, lb2)
d2:[0], d2:[1] = pd:[0], pd:[1]
fin
else
d2:[0], d2:[1] = pd:[0], pd:[1]
fin
else
d1:[0], d1:[1] = pd:[0], pd:[1]