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77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
// SPDX-License-Identifier: MIT
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#include "gfx/pal_sorting.hpp"
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#include <algorithm>
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#include <array>
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#include <optional>
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#include <stdint.h>
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#include <vector>
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#include "helpers.hpp"
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#include "verbosity.hpp"
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#include "gfx/palette.hpp"
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#include "gfx/rgba.hpp"
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void sortIndexed(std::vector<Palette> &palettes, std::vector<Rgba> const &embPal) {
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verbosePrint(VERB_NOTICE, "Sorting palettes using embedded palette...\n");
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for (Palette &pal : palettes) {
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std::sort(RANGE(pal), [&](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 (Rgba const &rgba : embPal) {
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uint16_t color = rgba.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_(); // LCOV_EXCL_LINE
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});
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}
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}
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void sortGrayscale(
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std::vector<Palette> &palettes, std::array<std::optional<Rgba>, NB_COLOR_SLOTS> const &colors
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) {
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verbosePrint(VERB_NOTICE, "Sorting palette by grayscale bins...\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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assume(palettes.size() == 1);
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Palette &palette = palettes[0];
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std::fill(RANGE(palette.colors), Rgba::transparent);
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for (std::optional<Rgba> 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 luminance(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 sortRgb(std::vector<Palette> &palettes) {
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verbosePrint(VERB_NOTICE, "Sorting palettes by luminance...\n");
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for (Palette &pal : palettes) {
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// Sort from lightest to darkest
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std::sort(RANGE(pal), [](uint16_t lhs, uint16_t rhs) {
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return luminance(lhs) > luminance(rhs);
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});
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}
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}
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