Implement enough functionality to compile & match pokecrystal

include/gfx/convert.hpp

@@ -9,59 +9,6 @@
 #ifndef RGBDS_GFX_CONVERT_HPP
 #define RGBDS_GFX_CONVERT_HPP
 
-#include <assert.h>
-#include <stdint.h>
-
-#include "gfx/main.hpp"
-
-struct Rgba {
-	uint8_t red;
-	uint8_t green;
-	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) {}
-	Rgba(uint32_t rgba) : red(rgba), green(rgba >> 8), blue(rgba >> 16), alpha(rgba >> 24) {}
-
-	operator uint32_t() const { return toCSS(); }
-	/**
-	 * Returns this RGBA as a 32-bit number that can be printed in hex (`%08x`) to yield its CSS
-	 * representation
-	 */
-	uint32_t toCSS() const {
-		auto shl = [](uint8_t val, unsigned shift) { return static_cast<uint32_t>(val) << shift; };
-		return shl(red, 24) | shl(green, 16) | shl(blue, 8) | shl(alpha, 0);
-	}
-	bool operator!=(Rgba const &other) const {
-		return static_cast<uint32_t>(*this) != static_cast<uint32_t>(other);
-	}
-
-	bool isGray() const { return red == green && green == blue; }
-
-	/**
-	 * CGB colors are RGB555, so we use bit 15 to signify that the color is transparent instead
-	 * Since the rest of the bits don't matter then, we return 0x8000 exactly.
-	 */
-	static constexpr uint16_t transparent = 0b1'00000'00000'00000;
-
-	/**
-	 * All alpha values strictly below this will be considered transparent
-	 */
-	static constexpr uint8_t opacity_threshold = 0xF0; // TODO: adjust this
-	/**
-	 * Computes the equivalent CGB color, respects the color curve depending on options
-	 */
-	uint16_t cgbColor() const {
-		if (alpha < opacity_threshold)
-			return transparent;
-		if (options.useColorCurve) {
-			assert(!"TODO");
-		} else {
-			return (red >> 3) | (green >> 3) << 5 | (blue >> 3) << 10;
-		}
-	}
-};
-
 void process();
 
 #endif /* RGBDS_GFX_CONVERT_HPP */