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ws2812 mix: add all, then divide (#2032) 

This achieves rounding between multiple summed frame buffers
This commit is contained in:
Nathaniel Wesley Filardo 2017-10-22 13:20:45 -04:00 committed by Marcel Stör
parent ded599f8ba
commit 5c8619eb4d
1 changed files with 5 additions and 3 deletions
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8
app/modules/ws2812.c
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@ -399,17 +399,19 @@ static int ws2812_buffer_mix(lua_State* L) {
size_t i;
for (i = 0; i < cells; i++) {
int val = 0;
int32_t val = 0;
for (src = 0; src < n_sources; src++) {
val += ((int)(source[src].values[i] * source[src].factor) >> 8);
val += (int32_t)(source[src].values[i] * source[src].factor);
}
val >>= 8;
if (val < 0) {
val = 0;
} else if (val > 255) {
val = 255;
}
buffer->values[i] = val;
buffer->values[i] = (uint8_t)val;
}
return 0;