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128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
/* Quicktex 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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#include "Color.h"
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#include <algorithm>
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#include <stdexcept>
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#include "Vector4.h"
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#include "Vector4Int.h"
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#include "util.h" // for scale5To8, scale8To5, assert5bit, scale6To8
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namespace quicktex {
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Color::Color(Vector4Int v) {
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if (v.MaxAbs() > 0xFF) throw std::invalid_argument("Vector members out of range");
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for (int i = 0; i < 4; i++) {
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if (v[i] < 0) throw std::range_error("Color members cannot be negative");
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}
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r = static_cast<uint8_t>(v[0]);
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g = static_cast<uint8_t>(v[1]);
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b = static_cast<uint8_t>(v[2]);
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a = static_cast<uint8_t>(v[3]);
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}
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uint16_t Color::Pack565Unscaled(uint8_t r, uint8_t g, uint8_t b) {
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assert5bit(r);
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assert6bit(g);
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assert5bit(b);
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return static_cast<uint16_t>(b | (g << 5) | (r << 11));
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}
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uint16_t Color::Pack565(uint8_t r, uint8_t g, uint8_t b) { return Pack565Unscaled(scale8To5(r), scale8To6(g), scale8To5(b)); }
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Color Color::Unpack565Unscaled(uint16_t Packed) {
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uint8_t r = (Packed >> 11) & 0x1F;
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uint8_t g = (Packed >> 5) & 0x3F;
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uint8_t b = Packed & 0x1F;
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return Color(r, g, b);
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}
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Color Color::Unpack565(uint16_t Packed) {
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uint8_t r = static_cast<uint8_t>(scale5To8((Packed >> 11) & 0x1FU));
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uint8_t g = static_cast<uint8_t>(scale6To8((Packed >> 5) & 0x3FU));
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uint8_t b = static_cast<uint8_t>(scale5To8(Packed & 0x1FU));
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return Color(r, g, b);
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}
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Color Color::PreciseRound565(Vector4 &v) {
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int trial_r = (int)(v[0] * UINT5_MAX);
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int trial_g = (int)(v[1] * UINT6_MAX);
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int trial_b = (int)(v[2] * UINT5_MAX);
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// clamp to prevent weirdness with slightly out of bounds float values
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uint8_t r = (uint8_t)clampi(trial_r, 0, UINT5_MAX);
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uint8_t g = (uint8_t)clampi(trial_g, 0, UINT6_MAX);
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uint8_t b = (uint8_t)clampi(trial_b, 0, UINT5_MAX);
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// increment each channel if above the rounding point
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r += v[0] > Midpoints5bit[r];
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g += v[1] > Midpoints6bit[g];
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b += v[2] > Midpoints5bit[b];
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assert5bit(r);
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assert6bit(g);
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assert5bit(b);
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return Color(r, g, b);
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}
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void Color::SetRGB(uint8_t vr, uint8_t vg, uint8_t vb) {
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r = vr;
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g = vg;
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b = vb;
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}
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size_t Color::MinChannelRGB() {
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if (r <= g && r <= b) return 0;
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if (g <= b && g <= r) return 1;
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return 2;
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}
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size_t Color::MaxChannelRGB() {
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if (r >= g && r >= b) return 0;
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if (g >= b && g >= r) return 1;
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return 2;
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}
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Color Color::Min(const Color &A, const Color &B) { return Color(std::min(A[0], B[0]), std::min(A[1], B[1]), std::min(A[2], B[2]), std::min(A[3], B[3])); }
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Color Color::Max(const Color &a, const Color &b) { return Color(std::max(a[0], b[0]), std::max(a[1], b[1]), std::max(a[2], b[2]), std::max(a[3], b[3])); }
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Color::operator Vector4() const { return Vector4(r, g, b, a); }
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Color::operator Vector4Int() const { return Vector4Int(r, g, b, a); }
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Vector4Int operator-(const Color &lhs, const Color &rhs) {
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Vector4Int result;
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for (unsigned i = 0; i < 4; i++) { result[i] = (int)lhs[i] - rhs[i]; }
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return result;
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}
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uint16_t Color::Pack565() const { return Pack565(r, g, b); }
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uint16_t Color::Pack565Unscaled() const { return Pack565Unscaled(r, g, b); }
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Color Color::ScaleTo565() const { return Color(scale8To5(r), scale8To6(g), scale8To5(b)); }
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Color Color::ScaleFrom565() const { return Color(scale5To8(r), scale6To8(g), scale5To8(b)); }
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bool Color::operator==(const Color &Rhs) const { return r == Rhs.r && g == Rhs.g && b == Rhs.b && a == Rhs.a; }
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bool Color::operator!=(const Color &Rhs) const { return !(Rhs == *this); }
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} // namespace quicktex
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