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Factor out a single PNG-reading function to encapsulate the libpng API (#1765)

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Rangi
2025-07-23 15:53:33 -04:00
committed by GitHub
parent 2ce4cdbff6
commit 7e151f16c3
19 changed files with 395 additions and 543 deletions
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16
include/gfx/rgba.hpp
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@@ -17,16 +17,16 @@ struct Rgba {
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;
static constexpr Rgba fromCGBColor(uint16_t color) {
constexpr auto _5to8 = [](uint8_t channel) -> uint8_t {
channel &= 0b11111; // For caller's convenience
return channel << 3 | channel >> 2;
};
return {
_5to8(cgbColor),
_5to8(cgbColor >> 5),
_5to8(cgbColor >> 10),
static_cast<uint8_t>(cgbColor & 0x8000 ? 0x00 : 0xFF),
_5to8(color),
_5to8(color >> 5),
_5to8(color >> 10),
static_cast<uint8_t>(color & 0x8000 ? 0x00 : 0xFF),
};
}