RGB565: Fix gcc 12.3 compatibility (no std::bit_cast)

danngreen · danngreen · commit 9980db6c37e0 · 2025-12-20T08:07:40.000-08:00
diff --git a/util/colors_rgb565.hh b/util/colors_rgb565.hh
@@ -32,7 +32,11 @@ struct RGB565 {
 
 	// Construct from raw u16 RGB565 format
 	RGB565 operator=(uint16_t raw) {
+#if defined(__cpp_lib_bit_cast)
 		*this = std::bit_cast<RGB565>(raw);
+#else
+		std::memcpy(this, (void *)(&raw), 2);
+#endif
 		return *this;
 	}
 
@@ -41,7 +45,11 @@ struct RGB565 {
 	}
 
 	constexpr operator uint16_t() const {
+#if defined(__cpp_lib_bit_cast)
 		return std::bit_cast<uint16_t>(*this);
+#else
+		return raw();
+#endif
 	}
 
 	//0..255

Original file line number	Diff line number	Diff line change
`@@ -32,7 +32,11 @@ struct RGB565 {`
`32`	`32`
`33`	`33`	`// Construct from raw u16 RGB565 format`
`34`	`34`	`RGB565 operator=(uint16_t raw) {`
	`35`	`+#if defined(__cpp_lib_bit_cast)`
`35`	`36`	`*this = std::bit_cast<RGB565>(raw);`
	`37`	`+#else`
	`38`	`+ std::memcpy(this, (void *)(&raw), 2);`
	`39`	`+#endif`
`36`	`40`	`return *this;`
`37`	`41`	`}`
`38`	`42`
`@@ -41,7 +45,11 @@ struct RGB565 {`
`41`	`45`	`}`
`42`	`46`
`43`	`47`	`constexpr operator uint16_t() const {`
	`48`	`+#if defined(__cpp_lib_bit_cast)`
`44`	`49`	`return std::bit_cast<uint16_t>(*this);`
	`50`	`+#else`
	`51`	`+ return raw();`
	`52`	`+#endif`
`45`	`53`	`}`
`46`	`54`
`47`	`55`	`//0..255`