shithub: rgbds

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Implement `-C`

--- a/src/gfx/rgba.cpp

+++ b/src/gfx/rgba.cpp

@@ -6,15 +6,43 @@

 #include "gfx/main.hpp" // options

+/*

+ * based on the Gaussian-like curve used by SameBoy since commit

+ * 65dd02cc52f531dbbd3a7e6014e99d5b24e71a4c (Oct 2017)

+ * with ties resolved by comparing the difference of the squares.

+ */

+static std::array<uint8_t, 256> reverse_curve{

+	0,  0,  1,  1,  2,  2,  3,  3,  3,  3,  4,  4,  4,  4,  4,  4, // These

+	5,  5,  5,  5,  5,  5,  6,  6,  6,  6,  6,  6,  6,  6,  7,  7, // comments

+	7,  7,  7,  7,  7,  7,  7,  8,  8,  8,  8,  8,  8,  8,  8,  8, // prevent

+	9,  9,  9,  9,  9,  9,  9,  9,  9,  9,  10, 10, 10, 10, 10, 10, // clang-format

+	10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, // from

+	12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, // reflowing

+	13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, // these

+	14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, // 16

+	16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, // 16-iterm

+	17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, // lines,

+	18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, // which,

+	19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, // in

+	21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, // my

+	22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, // opinion,

+	24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, // help

+	26, 27, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 30, 30, 31, // visualization!

+};

+

 uint16_t Rgba::cgbColor() const {

 	if (isTransparent()) {

 		return transparent;

 	}

+

+	uint8_t r = red, g = green, b = blue;

 	if (options.useColorCurve) {

-		assert(!"TODO");

-	} else {

-		return (red >> 3) | (green >> 3) << 5 | (blue >> 3) << 10;

+		g = g * 4 < b ? 0 : (g * 4 - b) / 3;

+		r = reverse_curve[r];

+		g = reverse_curve[g];

+		b = reverse_curve[b];

 	}

+	return (r >> 3) | (g >> 3) << 5 | (b >> 3) << 10;

 }

 uint8_t Rgba::grayIndex() const {