[nostalgia/core] Cleanup reading of SubSheet::pixels

2022-03-05 16:00:32 -06:00
parent 20a61de9fd
commit f40c912365
2 changed files with 25 additions and 22 deletions
@@ -180,6 +180,22 @@ struct TileSheet {
 			return getPixel(bpp, idx);
 		}

+		constexpr auto walkPixels(int8_t bpp, auto callback) const noexcept {
+			if (bpp == 4) {
+				for (std::size_t i = 0; i < pixels.size(); ++i) {
+					const auto colorIdx1 = pixels[i] & 0xF;
+					const auto colorIdx2 = pixels[i] >> 4;
+					callback(i * 2 + 0, colorIdx1);
+					callback(i * 2 + 1, colorIdx2);
+				}
+			} else {
+				for (std::size_t i = 0; i < pixels.size(); ++i) {
+					const auto p = pixels[i];
+					callback(i, p);
+				}
+			}
+		}
+
 		constexpr void setPixel(int8_t bpp, uint64_t idx, uint8_t palIdx) noexcept {
 			auto &pixel = this->pixels[idx / 2];
 			if (bpp == 4) {