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[light] Deduplicate color_uncorrect channel math via shared helper (#15727)

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This commit is contained in:
J. Nick Koston
2026-04-14 07:50:28 -10:00
committed by GitHub
parent da9fbb8044
commit 4729efbd04
2 changed files with 24 additions and 25 deletions
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esphome/components/light/esp_color_correction.cpp
+16
View File
@@ -22,4 +22,20 @@ uint8_t ESPColorCorrection::gamma_uncorrect_(uint8_t value) const {
return (target - a <= b - target) ? lo : lo + 1;
}
Color ESPColorCorrection::color_uncorrect(Color color) const {
// uncorrected = corrected^(1/gamma) / (max_brightness * local_brightness)
return Color(this->color_uncorrect_red(color.red), this->color_uncorrect_green(color.green),
this->color_uncorrect_blue(color.blue), this->color_uncorrect_white(color.white));
}
uint8_t ESPColorCorrection::color_uncorrect_channel_(uint8_t value, uint8_t max_brightness) const {
if (max_brightness == 0 || this->local_brightness_ == 0)
return 0;
// Use 32-bit intermediates: when max_brightness and local_brightness_ are small but non-zero,
// (uncorrected / max_brightness) * 255 can exceed 65535 before the std::min(255) clamp runs.
uint32_t uncorrected = this->gamma_uncorrect_(value) * 255UL;
uint32_t res = ((uncorrected / max_brightness) * 255UL) / this->local_brightness_;
return static_cast<uint8_t>(std::min(res, uint32_t(255)));
}
} // namespace esphome::light
esphome/components/light/esp_color_correction.h
+8 -25
View File
@@ -46,38 +46,18 @@ class ESPColorCorrection {
uint8_t res = esp_scale8_twice(white, this->max_brightness_.white, this->local_brightness_);
return this->gamma_correct_(res);
}
inline Color color_uncorrect(Color color) const ESPHOME_ALWAYS_INLINE {
// uncorrected = corrected^(1/gamma) / (max_brightness * local_brightness)
return Color(this->color_uncorrect_red(color.red), this->color_uncorrect_green(color.green),
this->color_uncorrect_blue(color.blue), this->color_uncorrect_white(color.white));
}
Color color_uncorrect(Color color) const;
inline uint8_t color_uncorrect_red(uint8_t red) const ESPHOME_ALWAYS_INLINE {
if (this->max_brightness_.red == 0 || this->local_brightness_ == 0)
return 0;
uint16_t uncorrected = this->gamma_uncorrect_(red) * 255UL;
uint16_t res = ((uncorrected / this->max_brightness_.red) * 255UL) / this->local_brightness_;
return (uint8_t) std::min(res, uint16_t(255));
return this->color_uncorrect_channel_(red, this->max_brightness_.red);
}
inline uint8_t color_uncorrect_green(uint8_t green) const ESPHOME_ALWAYS_INLINE {
if (this->max_brightness_.green == 0 || this->local_brightness_ == 0)
return 0;
uint16_t uncorrected = this->gamma_uncorrect_(green) * 255UL;
uint16_t res = ((uncorrected / this->max_brightness_.green) * 255UL) / this->local_brightness_;
return (uint8_t) std::min(res, uint16_t(255));
return this->color_uncorrect_channel_(green, this->max_brightness_.green);
}
inline uint8_t color_uncorrect_blue(uint8_t blue) const ESPHOME_ALWAYS_INLINE {
if (this->max_brightness_.blue == 0 || this->local_brightness_ == 0)
return 0;
uint16_t uncorrected = this->gamma_uncorrect_(blue) * 255UL;
uint16_t res = ((uncorrected / this->max_brightness_.blue) * 255UL) / this->local_brightness_;
return (uint8_t) std::min(res, uint16_t(255));
return this->color_uncorrect_channel_(blue, this->max_brightness_.blue);
}
inline uint8_t color_uncorrect_white(uint8_t white) const ESPHOME_ALWAYS_INLINE {
if (this->max_brightness_.white == 0 || this->local_brightness_ == 0)
return 0;
uint16_t uncorrected = this->gamma_uncorrect_(white) * 255UL;
uint16_t res = ((uncorrected / this->max_brightness_.white) * 255UL) / this->local_brightness_;
return (uint8_t) std::min(res, uint16_t(255));
return this->color_uncorrect_channel_(white, this->max_brightness_.white);
}
protected:
@@ -85,6 +65,9 @@ class ESPColorCorrection {
uint8_t gamma_correct_(uint8_t value) const;
/// Reverse gamma: binary search the forward PROGMEM table
uint8_t gamma_uncorrect_(uint8_t value) const;
/// Shared body of color_uncorrect_{red,green,blue,white}. Kept out-of-line
/// to avoid duplicating two 16-bit divides at every call site.
uint8_t color_uncorrect_channel_(uint8_t value, uint8_t max_brightness) const;
const uint16_t *gamma_table_{nullptr};
Color max_brightness_{255, 255, 255, 255};