Codechange: replace InjectDParam/ShiftParameters by setting the right parameter values in the first place

src/strings.cpp

@@ -83,16 +83,6 @@ int64 StringParameters::GetInt64(WChar type)
 	return this->data[this->offset++];
 }
 
-/**
- * Shift all data in the data array by the given amount to make
- * room for some extra parameters.
- */
-void StringParameters::ShiftParameters(uint amount)
-{
-	assert(amount <= this->num_param);
-	MemMoveT(this->data + amount, this->data, this->num_param - amount);
-}
-
 /**
  * Set DParam n to some number that is suitable for string size computations.
  * @param n Index of the string parameter.
@@ -319,15 +309,6 @@ void SetDParamStr(uint n, const std::string &str)
 	SetDParamStr(n, str.c_str());
 }
 
-/**
- * Shift the string parameters in the global string parameter array by \a amount positions, making room at the beginning.
- * @param amount Number of positions to shift.
- */
-void InjectDParam(uint amount)
-{
-	_global_string_params.ShiftParameters(amount);
-}
-
 /**
  * Format a number into a string.
  * @param buff      the buffer to write to

src/strings_func.h

@@ -122,8 +122,6 @@ public:
 		return (int32)this->GetInt64(type);
 	}
 
-	void ShiftParameters(uint amount);
-
 	/** Get a pointer to the current element in the data array. */
 	uint64 *GetDataPointer() const
 	{
@@ -179,8 +177,6 @@ const char *GetStringPtr(StringID string);
 uint ConvertKmhishSpeedToDisplaySpeed(uint speed);
 uint ConvertDisplaySpeedToKmhishSpeed(uint speed);
 
-void InjectDParam(uint amount);
-
 /**
  * Set a string parameter \a v at index \a n in a given array \a s.
  * @param s Array of string parameters.

src/subsidy.cpp

@@ -47,8 +47,7 @@ void Subsidy::AwardTo(CompanyID company)
 	NewsStringData *company_name = new NewsStringData(GetString(STR_COMPANY_NAME));
 
 	/* Add a news item */
-	std::pair<NewsReferenceType, NewsReferenceType> reftype = SetupSubsidyDecodeParam(this, SubsidyDecodeParamType::NewsAwarded);
-	InjectDParam(1);
+	std::pair<NewsReferenceType, NewsReferenceType> reftype = SetupSubsidyDecodeParam(this, SubsidyDecodeParamType::NewsAwarded, 1);
 
 	SetDParamStr(0, company_name->string);
 	AddNewsItem(
@@ -67,9 +66,10 @@ void Subsidy::AwardTo(CompanyID company)
  * Setup the string parameters for printing the subsidy at the screen, and compute the news reference for the subsidy.
  * @param s %Subsidy being printed.
  * @param mode Type of subsidy news message to decide on parameter format.
+ * @param parameter_offset The location/index in the String DParams to start decoding the subsidy's parameters. Defaults to 0.
  * @return Reference of the subsidy in the news system.
  */
-std::pair<NewsReferenceType, NewsReferenceType> SetupSubsidyDecodeParam(const Subsidy *s, SubsidyDecodeParamType mode)
+std::pair<NewsReferenceType, NewsReferenceType> SetupSubsidyDecodeParam(const Subsidy *s, SubsidyDecodeParamType mode, uint parameter_offset)
 {
 	NewsReferenceType reftype1 = NR_NONE;
 	NewsReferenceType reftype2 = NR_NONE;
@@ -77,40 +77,40 @@ std::pair<NewsReferenceType, NewsReferenceType> SetupSubsidyDecodeParam(const Su
 	/* Choose whether to use the singular or plural form of the cargo name based on how we're printing the subsidy */
 	const CargoSpec *cs = CargoSpec::Get(s->cargo_type);
 	if (mode == SubsidyDecodeParamType::Gui || mode == SubsidyDecodeParamType::NewsWithdrawn) {
-		SetDParam(0, cs->name);
+		SetDParam(parameter_offset, cs->name);
 	} else {
-		SetDParam(0, cs->name_single);
+		SetDParam(parameter_offset, cs->name_single);
 	}
 
 	switch (s->src_type) {
 		case ST_INDUSTRY:
 			reftype1 = NR_INDUSTRY;
-			SetDParam(1, STR_INDUSTRY_NAME);
+			SetDParam(parameter_offset + 1, STR_INDUSTRY_NAME);
 			break;
 		case ST_TOWN:
 			reftype1 = NR_TOWN;
-			SetDParam(1, STR_TOWN_NAME);
+			SetDParam(parameter_offset + 1, STR_TOWN_NAME);
 			break;
 		default: NOT_REACHED();
 	}
-	SetDParam(2, s->src);
+	SetDParam(parameter_offset + 2, s->src);
 
 	switch (s->dst_type) {
 		case ST_INDUSTRY:
 			reftype2 = NR_INDUSTRY;
-			SetDParam(4, STR_INDUSTRY_NAME);
+			SetDParam(parameter_offset + 4, STR_INDUSTRY_NAME);
 			break;
 		case ST_TOWN:
 			reftype2 = NR_TOWN;
-			SetDParam(4, STR_TOWN_NAME);
+			SetDParam(parameter_offset + 4, STR_TOWN_NAME);
 			break;
 		default: NOT_REACHED();
 	}
-	SetDParam(5, s->dst);
+	SetDParam(parameter_offset + 5, s->dst);
 
 	/* If the subsidy is being offered or awarded, the news item mentions the subsidy duration. */
 	if (mode == SubsidyDecodeParamType::NewsOffered || mode == SubsidyDecodeParamType::NewsAwarded) {
-		SetDParam(7, _settings_game.difficulty.subsidy_duration);
+		SetDParam(parameter_offset + 7, _settings_game.difficulty.subsidy_duration);
 	}
 
 	return std::pair<NewsReferenceType, NewsReferenceType>(reftype1, reftype2);

src/subsidy_func.h

@@ -17,7 +17,7 @@
 #include "news_type.h"
 #include "subsidy_base.h"
 
-std::pair<NewsReferenceType, NewsReferenceType> SetupSubsidyDecodeParam(const struct Subsidy *s, SubsidyDecodeParamType mode);
+std::pair<NewsReferenceType, NewsReferenceType> SetupSubsidyDecodeParam(const struct Subsidy *s, SubsidyDecodeParamType mode, uint parameter_offset = 0);
 void DeleteSubsidyWith(SourceType type, SourceID index);
 bool CheckSubsidised(CargoID cargo_type, CompanyID company, SourceType src_type, SourceID src, const Station *st);
 void RebuildSubsidisedSourceAndDestinationCache();