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9783671399
* Remove namespaces * Prefer `bool operator==`, not `friend auto operator==` * Prefer not to use `using` * Use a `constexpr` function instead of a template for `flipTable`
83 lines
2.2 KiB
C++
83 lines
2.2 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 "helpers.hpp"
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#include "gfx/main.hpp"
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void sortIndexed(
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std::vector<Palette> &palettes,
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int palSize,
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png_color const *palRGB,
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int palAlphaSize,
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png_byte *palAlpha
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) {
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options.verbosePrint(Options::VERB_LOG_ACT, "Sorting palettes using embedded palette...\n");
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auto pngToRgb = [&palRGB, &palAlphaSize, &palAlpha](int index) {
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auto const &c = palRGB[index];
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return Rgba(
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c.red, c.green, c.blue, palAlpha && index < palAlphaSize ? palAlpha[index] : 0xFF
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);
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};
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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 (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 sortGrayscale(
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std::vector<Palette> &palettes, std::array<std::optional<Rgba>, 0x8001> const &colors
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) {
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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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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 (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 sortRgb(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(RANGE(pal), [](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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