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fast inline color fading for bus drivers

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based on upstream color_fade() and color_scale() by @DedeHai
This commit is contained in:
Frank
2026-03-26 12:12:32 +01:00
parent d885677896
commit d948ec667e
2 changed files with 23 additions and 1 deletions
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2
wled00/bus_manager.cpp
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@@ -1142,7 +1142,7 @@ void __attribute__((hot)) IRAM_ATTR BusHub75Matrix::setPixelColor(uint16_t pix,
uint32_t IRAM_ATTR BusHub75Matrix::getPixelColor(uint16_t pix) const {
// if (pix >= _len || !_ledBuffer) return BLACK; // not necessary - this was already checked at busses.getPixelColor()
#if defined(WLEDMM_FASTPATH) && !defined(WLEDMM_SAVE_FLASH)
return color_fade(uint32_t(_ledBuffer[pix]) & 0x00FFFFFF, _bri); // this is slightly faster if we have inline color_fade()
return color_fade_fast(uint32_t(_ledBuffer[pix]) & 0x00FFFFFF, _bri); // this is slightly faster if we have inline color_fade()
#else
return uint32_t(_ledBuffer[pix].scale8(_bri)) & 0x00FFFFFF; // do it the FastLED way
#endif

22
wled00/bus_manager.h
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@@ -32,6 +32,28 @@ bool getBitFromArray(const uint8_t* byteArray, size_t position) __attribute__((
size_t getBitArrayBytes(size_t num_bits) __attribute__((const)); // number of bytes needed for an array with num_bits bits
void setBitArray(uint8_t* byteArray, size_t numBits, bool value); // set all bits to same value
/**
* fast color fading / scaling - based on upstream color_fade() and color_scale() by @DedeHai
*/
// fast color fade without "video" option - fades color toward black
static inline uint32_t color_fade_fast(uint32_t c1, uint_fast8_t amount) {
if (c1 == 0 || amount == 0) return 0; // black or no change
if (amount == 255) return c1;
constexpr uint32_t TWO_CHANNEL_MASK = 0x00FF00FF;
uint32_t rb = c1 & TWO_CHANNEL_MASK; // extract R and B channels
uint32_t wg = (c1 >> 8) & TWO_CHANNEL_MASK; // extract W and G channels (shifted for multiplication)
uint32_t rb_scaled = ((rb * (amount + 1)) >> 8) & TWO_CHANNEL_MASK; // scale red and blue
uint32_t wg_scaled = ((wg * (amount + 1)) & ~TWO_CHANNEL_MASK); // scale white and green
return (rb_scaled | wg_scaled);
}
// faster than fastled color scaling as it does in place scaling
static inline void CRGB_scale_fast(CRGB &c, const uint8_t scale) {
c.r = ((c.r * scale) >> 8);
c.g = ((c.g * scale) >> 8);
c.b = ((c.b * scale) >> 8);
}
#define GET_BIT(var,bit) (((var)>>(bit))&0x01)
#define SET_BIT(var,bit) ((var)|=(uint16_t)(0x0001<<(bit)))