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Fix overflow in ESPColorCorrection object (#7268)

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Gábor Kiss 2024-08-16 00:35:00 +02:00 committed by Jesse Hills
parent e17c7124f4
commit 033ab55206
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1 changed files with 8 additions and 8 deletions
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16
esphome/components/light/esp_color_correction.h
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@ -41,29 +41,29 @@ class ESPColorCorrection {
if (this->max_brightness_.red == 0 || this->local_brightness_ == 0) if (this->max_brightness_.red == 0 || this->local_brightness_ == 0)
return 0; return 0;
uint16_t uncorrected = this->gamma_reverse_table_[red] * 255UL; uint16_t uncorrected = this->gamma_reverse_table_[red] * 255UL;
uint8_t res = ((uncorrected / this->max_brightness_.red) * 255UL) / this->local_brightness_; uint16_t res = ((uncorrected / this->max_brightness_.red) * 255UL) / this->local_brightness_;
return res; return (uint8_t) std::min(res, uint16_t(255));
} }
inline uint8_t color_uncorrect_green(uint8_t green) const ESPHOME_ALWAYS_INLINE { inline uint8_t color_uncorrect_green(uint8_t green) const ESPHOME_ALWAYS_INLINE {
if (this->max_brightness_.green == 0 || this->local_brightness_ == 0) if (this->max_brightness_.green == 0 || this->local_brightness_ == 0)
return 0; return 0;
uint16_t uncorrected = this->gamma_reverse_table_[green] * 255UL; uint16_t uncorrected = this->gamma_reverse_table_[green] * 255UL;
uint8_t res = ((uncorrected / this->max_brightness_.green) * 255UL) / this->local_brightness_; uint16_t res = ((uncorrected / this->max_brightness_.green) * 255UL) / this->local_brightness_;
return res; return (uint8_t) std::min(res, uint16_t(255));
} }
inline uint8_t color_uncorrect_blue(uint8_t blue) const ESPHOME_ALWAYS_INLINE { inline uint8_t color_uncorrect_blue(uint8_t blue) const ESPHOME_ALWAYS_INLINE {
if (this->max_brightness_.blue == 0 || this->local_brightness_ == 0) if (this->max_brightness_.blue == 0 || this->local_brightness_ == 0)
return 0; return 0;
uint16_t uncorrected = this->gamma_reverse_table_[blue] * 255UL; uint16_t uncorrected = this->gamma_reverse_table_[blue] * 255UL;
uint8_t res = ((uncorrected / this->max_brightness_.blue) * 255UL) / this->local_brightness_; uint16_t res = ((uncorrected / this->max_brightness_.blue) * 255UL) / this->local_brightness_;
return res; return (uint8_t) std::min(res, uint16_t(255));
} }
inline uint8_t color_uncorrect_white(uint8_t white) const ESPHOME_ALWAYS_INLINE { inline uint8_t color_uncorrect_white(uint8_t white) const ESPHOME_ALWAYS_INLINE {
if (this->max_brightness_.white == 0 || this->local_brightness_ == 0) if (this->max_brightness_.white == 0 || this->local_brightness_ == 0)
return 0; return 0;
uint16_t uncorrected = this->gamma_reverse_table_[white] * 255UL; uint16_t uncorrected = this->gamma_reverse_table_[white] * 255UL;
uint8_t res = ((uncorrected / this->max_brightness_.white) * 255UL) / this->local_brightness_; uint16_t res = ((uncorrected / this->max_brightness_.white) * 255UL) / this->local_brightness_;
return res; return (uint8_t) std::min(res, uint16_t(255));
} }
protected: protected: