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refactor: share the shade step maths in ShadeMotion.cpp

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processFrame worked out a StepUp/StepDown target with the same formula in
eight places, each with its own divide-by-zero guard.  4dd4a98 fixed one
that guarded on downTime but divided by upTime.  stepPosition() takes the
travel time once, for both the guard and the maths, so they can't drift
apart again, and it is now covered by native tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
cjkas 2026-10-13 15:09:15 +02:00
parent ea520731a9
commit bea2f78cb6
4 changed files with 64 additions and 16 deletions
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6
src/ShadeMotion.cpp
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@ -30,6 +30,12 @@ int8_t displayPosition(float pos, bool flip) {
return static_cast<int8_t>(flip && pos >= 0.00f ? floor(100.0f - pos) : floor(pos));
}
float limitTarget(int8_t dir) { return dir > 0 ? 100.0f : 0.0f; }
bool stepPosition(float pos, int8_t dir, uint32_t travelMs, uint16_t stepSize, uint8_t frameStepSize, float &out) {
if(travelMs == 0 || stepSize == 0) return false;
const float step = 100.0f / (static_cast<float>(travelMs) / static_cast<float>(stepSize * frameStepSize));
out = dir > 0 ? std::min(100.0f, pos + step) : std::max(0.0f, pos - step);
return true;
}
void TxHold::mark(uint32_t jobSeq, bool moving, uint32_t now) {
if(jobSeq == 0 || this->seq != 0 || moving) return;
this->seq = jobSeq;