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Attempting extrapolation of fill pattern

This commit is contained in:
Matthias Koefferlein 2022-09-18 16:09:11 +02:00
parent ef5cd11629
commit 48e3643a87
1 changed files with 71 additions and 12 deletions
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83
src/laybasic/laybasic/layDitherPattern.cc
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@ -725,23 +725,82 @@ DitherPatternInfo::scale_pattern (unsigned int n)
std::vector<uint64_t> new_pattern;
new_pattern.resize (n * m_height, (uint64_t) 0);
for (unsigned int r = 0; r < n * m_height; ++r) {
for (unsigned int r = 0; r < m_height; ++r) {
const uint32_t *p = pattern () [r / n];
const uint32_t *p = pattern () [r];
const uint32_t *pb = pattern () [(r + m_height - 1) % m_height];
const uint32_t *pt = pattern () [(r + 1) % m_height];
uint64_t d = 0;
uint64_t mm = 1;
uint32_t m = 1;
for (unsigned int c = 0; c < m_width; ++c) {
for (unsigned int b = 0; b < n; ++b) {
if ((*p & m) != 0) {
d |= mm;
for (unsigned int l = 0; l < n; ++l) {
const uint32_t *py1 = (l < n / 2) ? pb : pt;
const uint32_t *py2 = (l < n / 2) ? pt : pb;
uint64_t d = 0;
uint64_t mm = 1;
uint32_t m = 1;
uint32_t mmax = 1 << m_width;
uint32_t ml = m_width > 1 ? (1 << (m_width - 1)) : 1;
uint32_t mr = m_width > 1 ? 2 : 1;
for (unsigned int c = 0; c < m_width; ++c) {
for (unsigned int b = 0; b < n; ++b) {
if ((*p & m) != 0) {
d |= mm;
} else {
// Try interpolation.
// In the following cases, the center's pixel lower-right quadrant fill be filled:
//
// (A1) (A2) (A3)
// x 0 0 x 0 0 x 0 1
// 0 0 1 0 0 1 0 0 1
// 0 1 x 1 1 x 0 1 x
//
// (B1) (B2)
// 0 1 x 0 0 0
// 0 0 1 1 0 1
// 0 1 x x 1 x
//
// For easy implementation, we encode the pattern into a byte k with the following significant bits
// (for lower-right subpixel, mirrored accordingly for the other subpixels)
//
// k bits:
// 0 1 2
// 3 - 4
// 5 6 7
//
uint32_t mx1 = (b < n / 2) ? ml : mr;
uint32_t mx2 = (b < n / 2) ? mr : ml;
uint8_t k = ((*py2 & mx2) != 0 ? 1 : 0) |
((*py2 & m) != 0 ? 2 : 0) |
((*py2 & mx1) != 0 ? 4 : 0) |
((*p & mx2) != 0 ? 8 : 0) |
((*p & mx1) != 0 ? 16 : 0) |
((*py1 & mx2) != 0 ? 32 : 0) |
((*py1 & m) != 0 ? 64 : 0) |
((*py1 & mx1) != 0 ? 128 : 0);
if ((k & 0x7e) == 0x50 /*(A1)*/ ||
(k & 0x7e) == 0x70 /*(A2)*/ ||
(k & 0x7e) == 0x54 /*(A3)*/ ||
(k & 0x7b) == 0x52 /*(B1)*/ ||
(k & 0x5f) == 0x58 /*(B2)*/) {
d |= mm;
}
}
mm <<= 1;
}
m <<= 1;
if ((ml <<= 1) == mmax) {
ml = 1;
}
if ((mr <<= 1) == mmax) {
mr = 1;
}
mm <<= 1;
}
}
new_pattern [r] = d;
new_pattern [r * n + l] = d;
}
}