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d86d24bdc1
If you need an explicit set of colors, possibly including unused ones, use `-c`. Fixes #1062
88 lines
2.3 KiB
C++
88 lines
2.3 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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#include "gfx/pal_sorting.hpp"
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#include <algorithm>
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#include <png.h>
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#include <vector>
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#include "helpers.h"
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#include "gfx/main.hpp"
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#include "gfx/process.hpp"
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namespace sorting {
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void indexed(std::vector<Palette> &palettes, int palSize, png_color const *palRGB,
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png_byte *palAlpha) {
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options.verbosePrint(Options::VERB_LOG_ACT, "Sorting palettes using embedded palette...\n");
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auto pngToRgb = [&palRGB, &palAlpha](int index) {
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auto const &c = palRGB[index];
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return Rgba(c.red, c.green, c.blue, palAlpha ? palAlpha[index] : 0xFF);
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};
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for (Palette &pal : palettes) {
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std::sort(pal.begin(), pal.end(), [&](uint16_t lhs, uint16_t rhs) {
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// Iterate through the PNG's palette, looking for either of the two
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for (int i = 0; i < palSize; ++i) {
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uint16_t color = pngToRgb(i).cgbColor();
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if (color == Rgba::transparent) {
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continue;
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}
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// Return whether lhs < rhs
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if (color == rhs) {
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return false;
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}
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if (color == lhs) {
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return true;
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}
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}
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unreachable_(); // This should not be possible
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});
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}
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}
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void grayscale(std::vector<Palette> &palettes,
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std::array<std::optional<Rgba>, 0x8001> const &colors) {
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options.verbosePrint(Options::VERB_LOG_ACT, "Sorting grayscale-only palette...\n");
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// This method is only applicable if there are at most as many colors as colors per palette, so
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// we should only have a single palette.
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assert(palettes.size() == 1);
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Palette &palette = palettes[0];
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std::fill(palette.colors.begin(), palette.colors.end(), Rgba::transparent);
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for (auto const &slot : colors) {
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if (!slot.has_value() || slot->isTransparent()) {
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continue;
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}
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palette[slot->grayIndex()] = slot->cgbColor();
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}
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}
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static unsigned int legacyLuminance(uint16_t color) {
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uint8_t red = color & 0b11111;
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uint8_t green = color >> 5 & 0b11111;
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uint8_t blue = color >> 10;
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return 2126 * red + 7152 * green + 722 * blue;
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}
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void rgb(std::vector<Palette> &palettes) {
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options.verbosePrint(Options::VERB_LOG_ACT, "Sorting palettes by \"\"\"luminance\"\"\"...\n");
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for (Palette &pal : palettes) {
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std::sort(pal.begin(), pal.end(), [](uint16_t lhs, uint16_t rhs) {
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return legacyLuminance(lhs) > legacyLuminance(rhs);
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});
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}
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}
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} // namespace sorting
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