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New app: Spectrum Painter (#988)

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* added spectrum painter app
This commit is contained in:
Bernd Herzog 2023-05-14 23:09:43 +02:00 • committed by GitHub
parent a27881ecd6
commit b4da86d491
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GPG key ID: 4AEE18F83AFDEB23
24 changed files with 1457 additions and 21 deletions
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10
firmware/common/ui.hpp
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@ -57,6 +57,16 @@ struct Color {
)}
{
}
uint8_t to_greyscale() {
uint32_t r = ((v >> 11) & 31U) << 3;
uint32_t g = ((v >> 5) & 63U) << 2;
uint32_t b = (v & 31U) << 3;
uint32_t grey = (r * 299 + g * 587 + b * 114) / 1000;
return (uint8_t)grey;
}
Color operator-() const {
return (v ^ 0xffff);