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67 lines
2.2 KiB
C++
67 lines
2.2 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 <cassert>
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#include <cstdint>
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#include <span>
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#include "blocks.h"
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template <size_t M, size_t N, class T> class ColorBlock {
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public:
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using row = std::span<T, N>;
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ColorBlock(const std::array<T *, N> &rows) {
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for (int i = 0; i < height(); i++) { this[i] = row(rows[i], rows[i] * N * sizeof(T)); }
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}
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ColorBlock(const std::array<row, N> &rows) {
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for (int i = 0; i < height(); i++) { this[i] = rows[i]; }
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}
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ColorBlock(const T *pixels) {
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for (int i = 0; i < height(); i++) { _rows[i] = std::span(pixels[i * width()]); }
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}
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ColorBlock(const T *image, int imageWidth, int imageHeight, int x = 0, int y = 0) {
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int image_x = x * width();
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int image_y = y * height();
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assert(image_x > 0 && image_x + width() < imageWidth);
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assert(image_y > 0 && image_y + height() < imageHeight);
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T *start = &image[image_x + (image_y * imageWidth)];
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for (int i = 0; i < height(); i++) { _rows[i] = std::span(start[i * imageWidth]); }
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}
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constexpr T &operator[](size_t n) noexcept { return _rows[n]; }
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constexpr int width() noexcept { return N; }
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constexpr int height() noexcept { return M; }
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constexpr int size() noexcept { return N * M; }
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private:
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std::array<row, M> _rows;
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};
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using Color4x4= ColorBlock<4, 4, Color32>;
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