mirror of
https://github.com/drewcassidy/quicktex.git
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187 lines
6.9 KiB
C++
187 lines
6.9 KiB
C++
/* Quicktex Texture Compression Library
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Copyright (C) 2021-2022 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 <climits>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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#include <memory>
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#include <stdexcept>
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#include <tuple>
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#include <type_traits>
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#include <vector>
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#include "Color.h"
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#include "ColorBlock.h"
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namespace quicktex {
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class Texture {
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public:
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virtual ~Texture() = default;
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virtual int Width() const { return _width; }
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virtual int Height() const { return _height; }
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virtual std::tuple<int, int> Size() const { return std::tuple<int, int>(_width, _height); }
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/**
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* The texture's total size
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* @return The size of the texture in bytes.
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*/
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virtual size_t NBytes() const noexcept = 0;
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virtual const uint8_t *Data() const noexcept = 0;
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virtual uint8_t *Data() noexcept = 0;
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protected:
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Texture(int width, int height) : _width(width), _height(height) {
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if (width <= 0) throw std::invalid_argument("Texture width must be greater than 0");
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if (height <= 0) throw std::invalid_argument("Texture height must be greater than 0");
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}
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int _width;
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int _height;
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};
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class RawTexture : public Texture {
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using Base = Texture;
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public:
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/**
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* Create a new RawTexture
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* @param width width of the texture in pixels
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* @param height height of the texture in pixels
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*/
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RawTexture(int width, int height) : Base(width, height), _pixels(_width * _height) {}
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Color GetPixel(int x, int y) const {
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if (x < 0 || x >= _width) throw std::invalid_argument("x value out of range.");
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if (y < 0 || y >= _height) throw std::invalid_argument("y value out of range.");
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return _pixels.at(x + (y * _width));
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}
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void SetPixel(int x, int y, Color val) {
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if (x < 0 || x >= _width) throw std::invalid_argument("x value out of range.");
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if (y < 0 || y >= _height) throw std::invalid_argument("y value out of range.");
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_pixels.at(x + (y * _width)) = val;
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}
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size_t NBytes() const noexcept override { return static_cast<unsigned long>(Width() * Height()) * sizeof(Color); }
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template <int N, int M> ColorBlock<N, M> GetBlock(int block_x, int block_y) const {
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if (block_x < 0) throw std::out_of_range("x value out of range.");
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if (block_y < 0) throw std::out_of_range("y value out of range.");
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// coordinates in the image of the top-left pixel of the selected block
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ColorBlock<N, M> block;
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int pixel_x = block_x * N;
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int pixel_y = block_y * M;
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if (pixel_x + N < _width && pixel_y + M < _height) {
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// fast memcpy if the block is entirely inside the bounds of the texture
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for (int y = 0; y < M; y++) {
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// copy each row into the ColorBlock
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block.SetRow(y, &_pixels[pixel_x + (_width * (pixel_y + y))]);
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}
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} else {
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// slower pixel-wise copy if the block goes over the edges
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for (int x = 0; x < N; x++) {
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for (int y = 0; y < M; y++) { block.Set(x, y, GetPixel((pixel_x + x) % _width, (pixel_y + y) % _height)); }
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}
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}
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return block;
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}
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template <int N, int M> void SetBlock(int block_x, int block_y, const ColorBlock<N, M> &block) {
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if (block_x < 0) throw std::out_of_range("x value out of range.");
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if (block_y < 0) throw std::out_of_range("y value out of range.");
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// coordinates in the image of the top-left pixel of the selected block
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int pixel_x = block_x * N;
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int pixel_y = block_y * M;
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if (pixel_x + N < _width && pixel_y + M < _height) {
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// fast row-wise memcpy if the block is entirely inside the bounds of the texture
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for (int y = 0; y < M; y++) {
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// copy each row out of the ColorBlock
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block.GetRow(y, &_pixels[pixel_x + (_width * (pixel_y + y))]);
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}
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} else {
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// slower pixel-wise copy if the block goes over the edges
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for (int x = 0; x < N; x++) {
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for (int y = 0; y < M; y++) { SetPixel((pixel_x + x) % _width, (pixel_y + y) % _height, block.Get(x, y)); }
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}
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}
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}
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virtual const uint8_t *Data() const noexcept override { return reinterpret_cast<const uint8_t *>(_pixels.data()); }
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virtual uint8_t *Data() noexcept override { return reinterpret_cast<uint8_t *>(_pixels.data()); }
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protected:
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std::vector<Color> _pixels;
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};
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template <typename B> class BlockTexture final : public Texture {
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private:
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std::vector<B> _blocks;
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int _width_b;
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int _height_b;
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public:
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using BlockType = B;
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using Base = Texture;
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/**
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* Create a new BlockTexture
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* @param width width of the texture in pixels. must be divisible by B::Width
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* @param height height of the texture in pixels. must be divisible by B::Height
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*/
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BlockTexture(int width, int height) : Base(width, height) {
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_width_b = (_width + B::Width - 1) / B::Width;
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_height_b = (_height + B::Height - 1) / B::Height;
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_blocks = std::vector<B>(_width_b * _height_b);
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}
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constexpr int BlocksX() const { return _width_b; }
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constexpr int BlocksY() const { return _height_b; }
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constexpr std::tuple<int, int> BlocksXY() const { return std::tuple<int, int>(_width_b, _height_b); }
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B GetBlock(int x, int y) const {
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if (x < 0 || x >= _width_b) throw std::out_of_range("x value out of range.");
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if (y < 0 || y >= _height_b) throw std::out_of_range("y value out of range.");
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return _blocks.at(x + (y * _width_b));
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}
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void SetBlock(int x, int y, const B &val) {
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if (x < 0 || x >= _width_b) throw std::out_of_range("x value out of range.");
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if (y < 0 || y >= _height_b) throw std::out_of_range("y value out of range.");
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_blocks.at(x + (y * _width_b)) = val;
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}
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size_t NBytes() const noexcept override { return _blocks.size() * sizeof(B); }
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const uint8_t *Data() const noexcept override { return reinterpret_cast<const uint8_t *>(_blocks.data()); }
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uint8_t *Data() noexcept override { return reinterpret_cast<uint8_t *>(_blocks.data()); }
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};
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} // namespace quicktex
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