Optimize replace processing

This commit is contained in:
Kae 2023-06-26 17:09:19 +10:00
parent d5d474c673
commit c6cb370c13

View File

@ -5,6 +5,7 @@
#include "StarColor.hpp"
#include "StarImage.hpp"
#include "StarStringView.hpp"
#include "StarEncode.hpp"
namespace Star {
@ -148,7 +149,69 @@ FadeToColorImageOperation::FadeToColorImageOperation(Vec3B color, float amount)
ImageOperation imageOperationFromString(StringView string) {
try {
std::string_view view = string.utf8();
auto firstBitEnd = view.find_first_of("=;");
if (view.substr(0, firstBitEnd).compare("replace") == 0 && (firstBitEnd + 1) != view.size()) {
//Perform optimized replace parse
ColorReplaceImageOperation operation;
std::string_view bits = view.substr(firstBitEnd + 1);
char const* hexPtr = nullptr;
unsigned int hexLen = 0;
char const* ptr = bits.data();
char const* end = ptr + bits.size();
char a[4]{}, b[4]{};
bool which = true;
while (true) {
char ch = *ptr;
if (ch == '=' || ch == ';' || ptr == end) {
char* c = which ? a : b;
if (hexLen == 3) {
nibbleDecode(hexPtr, 3, c, 4);
c[0] |= (c[0] << 4);
c[1] |= (c[1] << 4);
c[2] |= (c[2] << 4);
c[3] = 255;
}
else if (hexLen == 4) {
nibbleDecode(hexPtr, 4, c, 4);
c[0] |= (c[0] << 4);
c[1] |= (c[1] << 4);
c[2] |= (c[2] << 4);
c[3] |= (c[3] << 4);
}
else if (hexLen == 6) {
hexDecode(hexPtr, 6, c, 4);
c[3] = 255;
}
else if (hexLen == 8) {
hexDecode(hexPtr, 8, c, 4);
}
else
throw ImageOperationException(strf("Improper size for hex string '%s' in imageOperationFromString", StringView(hexPtr, hexLen)), false);
if (which = !which)
operation.colorReplaceMap[*(Vec4B*)&a] = *(Vec4B*)&b;
hexLen = 0;
}
else if (!hexLen++)
hexPtr = ptr;
if (ptr++ == end)
break;
}
return move(operation);
}
List<StringView> bits;
string.forEachSplitAnyView("=;", [&](StringView split, size_t, size_t) {
if (!split.empty())
bits.emplace_back(split);