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Implement preliminary version of "reverse" feature

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Not hooked to all RGBGFX flags yet, but good enough for most use cases
(and as a base for future development, should I need to `reset --hard`.)

TODOs marked appropriately.
This commit is contained in:
ISSOtm
2022-03-27 20:21:00 +02:00
committed by Eldred Habert
parent 843022772b
commit cc27169ecd
9 changed files with 428 additions and 18 deletions
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14
include/gfx/rgba.hpp
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@@ -17,13 +17,23 @@ struct Rgba {
uint8_t blue;
uint8_t alpha;
Rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a) : red(r), green(g), blue(b), alpha(a) {}
constexpr Rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
: red(r), green(g), blue(b), alpha(a) {}
/**
* Constructs the color from a "packed" RGBA representation (0xRRGGBBAA)
*/
explicit Rgba(uint32_t rgba = 0)
explicit constexpr Rgba(uint32_t rgba = 0)
: red(rgba >> 24), green(rgba >> 16), blue(rgba >> 8), alpha(rgba) {}
static constexpr Rgba fromCGBColor(uint16_t cgbColor) {
constexpr auto _5to8 = [](uint8_t fiveBpp) -> uint8_t {
fiveBpp &= 0b11111; // For caller's convenience
return fiveBpp << 3 | fiveBpp >> 2;
};
return {_5to8(cgbColor), _5to8(cgbColor >> 5), _5to8(cgbColor >> 10),
(uint8_t)(cgbColor & 0x8000 ? 0x00 : 0xFF)};
}
/**
* Returns this RGBA as a 32-bit number that can be printed in hex (`%08x`) to yield its CSS
* representation