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d30e507270
And also the inverted alpha channel condition causing the wrong colors to be treated as transparent
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/*
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* This file is part of RGBDS.
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*
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* Copyright (c) 2022, Eldred Habert and RGBDS contributors.
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef RGBDS_GFX_CONVERT_HPP
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#define RGBDS_GFX_CONVERT_HPP
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#include <assert.h>
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#include <stdint.h>
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#include "gfx/main.hpp"
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struct Rgba {
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uint8_t red;
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uint8_t green;
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uint8_t blue;
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uint8_t alpha;
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Rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a) : red(r), green(g), blue(b), alpha(a) {}
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Rgba(uint32_t rgba) : red(rgba), green(rgba >> 8), blue(rgba >> 16), alpha(rgba >> 24) {}
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operator uint32_t() const {
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auto shl = [](uint8_t val, unsigned shift) { return static_cast<uint32_t>(val) << shift; };
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return shl(red, 0) | shl(green, 8) | shl(blue, 16) | shl(alpha, 24);
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}
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bool operator!=(Rgba const &other) const {
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return static_cast<uint32_t>(*this) != static_cast<uint32_t>(other);
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}
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bool isGray() const { return red == green && green == blue; }
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/**
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* CGB colors are RGB555, so we use bit 15 to signify that the color is transparent instead
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* Since the rest of the bits don't matter then, we return 0x8000 exactly.
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*/
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static constexpr uint16_t transparent = 0b1'00000'00000'00000;
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static constexpr uint8_t transparency_threshold = 5; // TODO: adjust this
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/**
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* Computes the equivalent CGB color, respects the color curve depending on options
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*/
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uint16_t cgbColor() const {
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if (alpha > 0xFF - transparency_threshold)
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return transparent;
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if (options.useColorCurve) {
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assert(!"TODO");
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} else {
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return (red >> 3) | (green >> 3) << 5 | (blue >> 3) << 10;
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}
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}
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};
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void process();
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#endif /* RGBDS_GFX_CONVERT_HPP */
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