void initPropRanges(Ranges &propRanges, const ColorRanges &ranges, int p) {
propRanges.clear();
int min = ranges.min(p);
int max = ranges.max(p);
int mind = min - max, maxd = max - min;
if (p < 3) { // alpha channel first
for (int pp = 0; pp < p; pp++) {
propRanges.push_back(std::make_pair(ranges.min(pp), ranges.max(pp))); // pixels on previous planes
}
if (ranges.numPlanes()>3) propRanges.push_back(std::make_pair(ranges.min(3), ranges.max(3))); // pixel on alpha plane
}
//if (p<1 || p>2)
propRanges.push_back(std::make_pair(0,2)); // median predictor: which of the three values is the median?
if (p==1 || p==2) propRanges.push_back(std::make_pair(ranges.min(0)-ranges.max(0),ranges.max(0)-ranges.min(0))); // luma prediction miss
propRanges.push_back(std::make_pair(mind,maxd)); // neighbor A - neighbor B (top-bottom or left-right)
propRanges.push_back(std::make_pair(mind,maxd)); // top/left prediction miss (previous pixel)
propRanges.push_back(std::make_pair(mind,maxd)); // left/top prediction miss (other direction)
propRanges.push_back(std::make_pair(mind,maxd)); // bottom/right prediction miss
propRanges.push_back(std::make_pair(min,max)); // guess
// propRanges.push_back(std::make_pair(mind,maxd)); // left - topleft
// propRanges.push_back(std::make_pair(mind,maxd)); // topleft - top
// if (p == 0 || p > 2)
// propRanges.push_back(std::make_pair(mind,maxd)); // top - topright
if (p != 2) {
propRanges.push_back(std::make_pair(mind,maxd)); // toptop - top
propRanges.push_back(std::make_pair(mind,maxd)); // leftleft - left
}
}
void initPropRanges_scanlines(Ranges &propRanges, const ColorRanges &ranges, int p) {
propRanges.clear();
int min = ranges.min(p);
int max = ranges.max(p);
int mind = min - max, maxd = max - min;
if (p < 3) {
for (int pp = 0; pp < p; pp++) {
propRanges.push_back(std::make_pair(ranges.min(pp), ranges.max(pp))); // pixels on previous planes
}
if (ranges.numPlanes()>3) propRanges.push_back(std::make_pair(ranges.min(3), ranges.max(3))); // pixel on alpha plane
}
propRanges.push_back(std::make_pair(min,max)); // guess (median of 3)
propRanges.push_back(std::make_pair(0,2)); // which predictor was it
propRanges.push_back(std::make_pair(mind,maxd));
propRanges.push_back(std::make_pair(mind,maxd));
propRanges.push_back(std::make_pair(mind,maxd));
propRanges.push_back(std::make_pair(mind,maxd));
propRanges.push_back(std::make_pair(mind,maxd));
}
void initPropRanges(Ranges &propRanges, const ColorRanges &ranges, int p) {
propRanges.clear();
int min = ranges.min(p);
int max = ranges.max(p);
int mind = min - max, maxd = max - min;
if (p < 3) { // alpha channel first
for (int pp = 0; pp < p; pp++) {
propRanges.push_back(std::make_pair(ranges.min(pp), ranges.max(pp))); // pixels on previous planes
}
if (ranges.numPlanes()>3) propRanges.push_back(std::make_pair(ranges.min(3), ranges.max(3))); // pixel on alpha plane
}
propRanges.push_back(std::make_pair(mind,maxd)); // neighbor A - neighbor B (top-bottom or left-right)
propRanges.push_back(std::make_pair(min,max)); // guess (median of 3)
propRanges.push_back(std::make_pair(0,2)); // which predictor was it
propRanges.push_back(std::make_pair(mind,maxd));
propRanges.push_back(std::make_pair(mind,maxd));
propRanges.push_back(std::make_pair(mind,maxd));
if (p < 2 || p >= 3) {
propRanges.push_back(std::make_pair(mind,maxd));
propRanges.push_back(std::make_pair(mind,maxd));
}
}