internal static IEnumerable <CodeInstruction> ReplaceColors(
IEnumerable <CodeInstruction> instructions,
IEnumerable <KeyValuePair <Color, MethodInfo> > replacements
)
{
var replDict = replacements is null ? null : replacements is IDictionary <Color, MethodInfo> dict ? dict : replacements.ToDictionary(x => x.Key, x => x.Value);
var instrs = instructions.ToArray();
for (int i = 0; i < instrs.Length; i++)
{
CodeInstruction in0 = instrs[i];
if (i + 3 < instrs.Length && replDict is not null)
{
CodeInstruction in1 = instrs[i + 1];
CodeInstruction in2 = instrs[i + 2];
CodeInstruction in3 = instrs[i + 3];
if (in3.opcode == OpCodes.Newobj && in3.operand is ConstructorInfo ctor && ctor.DeclaringType == typeof(Color))
{
int?val0 = in0.AsInt();
int?val1 = in1.AsInt();
int?val2 = in2.AsInt();
if (val0.HasValue && val1.HasValue && val2.HasValue)
{
Color c = new(val0.Value, val1.Value, val2.Value);
if (replDict.TryGetValue(c, out var repl))
{
yield return(new CodeInstruction(
opcode: OpCodes.Call,
operand: repl
));
i += 3;
continue;
}
}
}
}
yield return(in0);
}
}
