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85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/* Python-rgbcx Texture Compression Library
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Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
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Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
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and licenced under the public domain
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <array>
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#include <cstdint>
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#pragma pack(push, 1)
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class Color {
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private:
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std::array<uint8_t, 4> _channels;
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public:
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Color();
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Color(uint8_t r, uint8_t g, uint8_t b, uint8_t a = 0xFF);
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static uint16_t Pack565Unscaled(uint8_t r, uint8_t g, uint8_t b);
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static uint16_t Pack565(uint8_t r, uint8_t g, uint8_t b);
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static Color Unpack565Unscaled(uint16_t Packed);
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static Color Unpack565(uint16_t Packed);
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bool operator==(const Color &Rhs) const { return R() == Rhs.R() && G() == Rhs.G() && B() == Rhs.B() && A() == Rhs.A(); }
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uint8_t operator[](size_t index) const {
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assert(index < 4);
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return _channels[index];
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}
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uint8_t &operator[](size_t index) {
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assert(index < 4);
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return _channels[index];
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}
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// more readable versions of index operator for each channel
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uint8_t &R() { return _channels[0]; }
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uint8_t &G() { return _channels[1]; }
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uint8_t &B() { return _channels[2]; }
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uint8_t &A() { return _channels[3]; }
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uint8_t R() const { return _channels[0]; }
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uint8_t G() const { return _channels[1]; }
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uint8_t B() const { return _channels[2]; }
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uint8_t A() const { return _channels[3]; }
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// Assignment functions
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void SetR(uint8_t r) { _channels[0] = r; }
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void SetG(uint8_t g) { _channels[1] = g; }
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void SetB(uint8_t b) { _channels[2] = b; }
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void SetA(uint8_t a) { _channels[3] = a; }
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void SetRGBA(uint8_t vr, uint8_t vg, uint8_t vb, uint8_t va);
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void SetRGBA(const Color &other) { SetRGBA(other.R(), other.G(), other.B(), other.A()); }
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void SetRGB(uint8_t vr, uint8_t vg, uint8_t vb);
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void SetRGB(const Color &other) { SetRGB(other.R(), other.G(), other.B()); }
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uint16_t pack565();
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uint16_t pack565Unscaled();
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Color ScaleTo565() const;
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Color ScaleFrom565() const;
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static Color min(const Color &A, const Color &B);
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static Color max(const Color &A, const Color &B);
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unsigned get_luma() const { return (13938U * R() + 46869U * G() + 4729U * B() + 32768U) >> 16U; } // REC709 weightings
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};
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#pragma pack(pop) |