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v.0.0.5 short description for __builtin_clz

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tiijay
2025-11-04 14:18:33 +01:00
parent 6377983edd
commit 23b57b34b5
1 changed files with 10 additions and 0 deletions
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10
lib/LedMatrix/src/LedMatrix.cpp
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@@ -19,6 +19,16 @@ uint8_t LedMatrix::charWidth(const uint8_t *charMatrix)
if (charMatrix[i] > max_val) if (charMatrix[i] > max_val)
max_val = charMatrix[i]; max_val = charMatrix[i];
} }
// __builtin_clz liefert Anzahl der führenden Nullen (int Bereich (32 Bit))
// Beispiele: für max_val
// 0 --> 32
// 1 --> 31
// 2 --> 30
// 4 --> 29
// 8 --> 28 ... etc.
// Deshalb 32 - Wert
// bei 8 -> 32-28 = 4.Bit
// bei 2 -> 32-20 = 2.Bit
return (max_val == 0) ? 0 : (32 - __builtin_clz(max_val)); return (max_val == 0) ? 0 : (32 - __builtin_clz(max_val));
} }