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Implement transparency handling

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Though none of this has been tested so far...
This commit is contained in:
ISSOtm
2022-03-13 11:28:20 +01:00
committed by Eldred Habert
parent e86eb9337a
commit 3c9d5b05d6
6 changed files with 32 additions and 24 deletions
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17
src/gfx/convert.cpp
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@@ -41,6 +41,10 @@ public:
void registerColor(Rgba const &rgba) {
decltype(_colors)::value_type &slot = _colors[rgba.cgbColor()];
if (rgba.cgbColor() == Rgba::transparent) {
options.hasTransparentPixels = true;
}
if (!slot.has_value()) {
slot.emplace(rgba);
} else if (*slot != rgba) {
@@ -120,10 +124,10 @@ public:
bool isSuitableForGrayscale() const {
// Check that all of the grays don't fall into the same "bin"
if (colors.size() > options.maxPalSize()) { // Apply the Pigeonhole Principle
if (colors.size() > options.maxOpaqueColors()) { // Apply the Pigeonhole Principle
options.verbosePrint(Options::VERB_DEBUG,
"Too many colors for grayscale sorting (%zu > %" PRIu8 ")\n",
colors.size(), options.maxPalSize());
colors.size(), options.maxOpaqueColors());
return false;
}
uint8_t bins = 0;
@@ -490,8 +494,8 @@ static std::tuple<DefaultInitVec<size_t>, std::vector<Palette>>
assert(options.palSpec.size() == 1);
// TODO: abort if ignored colors are being used; do it now for a friendlier error
// message
if (embPalSize > options.maxPalSize()) { // Ignore extraneous colors if they are unused
embPalSize = options.maxPalSize();
if (embPalSize > options.maxOpaqueColors()) { // Ignore extraneous colors if they are unused
embPalSize = options.maxOpaqueColors();
}
for (int i = 0; i < embPalSize; ++i) {
options.palSpec[0][i] = Rgba(embPalRGB[i].red, embPalRGB[i].green, embPalRGB[i].blue,
@@ -503,7 +507,7 @@ static std::tuple<DefaultInitVec<size_t>, std::vector<Palette>>
std::vector<Palette> palettes(options.palSpec.size());
auto palIter = palettes.begin(); // TODO: `zip`
for (auto const &spec : options.palSpec) {
for (size_t i = 0; i < options.maxPalSize(); ++i) {
for (size_t i = 0; i < options.nbColorsPerPal; ++i) {
(*palIter)[i] = spec[i].cgbColor();
}
++palIter;
@@ -532,7 +536,8 @@ static void outputPalettes(std::vector<Palette> const &palettes) {
output.open(options.palettes, std::ios_base::out | std::ios_base::binary);
for (Palette const &palette : palettes) {
for (uint16_t color : palette) {
for (uint8_t i = 0; i < options.nbColorsPerPal; ++i) {
uint16_t color = palette.colors[i]; // Will return `UINT16_MAX` for unused slots
output.sputc(color & 0xFF);
output.sputc(color >> 8);
}