drinkingtea/nostalgia
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[nostalgia/core] Add getTileCnt and fix getTileIdx

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This commit is contained in:
Gary Talent 2024-01-31 23:16:41 -06:00
parent ff2eb5b11b
commit 1dff26d895
1 changed files with 20 additions and 1 deletions
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21
src/nostalgia/modules/core/src/tilesheet.cpp
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@ -14,6 +14,7 @@ std::size_t idx(TileSheet::SubSheet const&ss, ox::Point const&pt) noexcept {
return ptToIdx(pt, ss.columns);
}
[[nodiscard]]
static TileSheet::SubSheet const*getSubsheet(TileSheet::SubSheet const&ss, SubSheetId const id) noexcept {
if (ss.id == id) {
return &ss;
@ -26,6 +27,24 @@ static TileSheet::SubSheet const*getSubsheet(TileSheet::SubSheet const&ss, SubSh
return {};
}
[[nodiscard]]
static size_t getTileCnt(TileSheet::SubSheet const&ss, int const bpp) noexcept {
if (ss.subsheets.empty()) {
auto const bytesPerTile = bpp == 4 ? 32u : 64u;
return ss.pixels.size() / bytesPerTile;
} else {
size_t out{};
for (auto const&child : ss.subsheets) {
out += getTileCnt(child, bpp);
}
return out;
}
}
size_t getTileCnt(TileSheet const&ts) noexcept {
return getTileCnt(ts.subsheet, ts.bpp);
}
TileSheet::SubSheet const*getSubsheet(TileSheet const&ts, SubSheetId const id) noexcept {
return getSubsheet(ts.subsheet, id);
}
@ -42,7 +61,7 @@ static ox::Optional<size_t> getPixelIdx(
if (auto out = getPixelIdx(child, id, idx, bpp)) {
return out;
}
idx += pixelCnt(ss, bpp);
idx += pixelCnt(child, bpp);
}
return {};
}