Add function level promotion detours for the CreateFont() family.

Yeah, I suck at inventing new terminology. Just read the comment, it should make more sense then.

thcrap/src/promote.c

@@ -0,0 +1,60 @@
+/**
+  * Touhou Community Reliant Automatic Patcher
+  * Main DLL
+  *
+  * ----
+  *
+  * Win32 detour function level promotion.
+  */
+
+#include "thcrap.h"
+#include "promote.h"
+
+/// CreateFont() family (promoting to CreateFontIndirectExA)
+/// -------------------
+HFONT WINAPI promote_CreateFontA(
+	__in int cHeight,
+	__in int cWidth,
+	__in int cEscapement,
+	__in int cOrientation,
+	__in int cWeight,
+	__in DWORD bItalic,
+	__in DWORD bUnderline,
+	__in DWORD bStrikeOut,
+	__in DWORD iCharSet,
+	__in DWORD iOutPrecision,
+	__in DWORD iClipPrecision,
+	__in DWORD iQuality,
+	__in DWORD iPitchAndFamily,
+	__in_opt LPCSTR pszFaceName
+)
+{
+	CreateFontIndirectA_type target = (CreateFontIndirectA_type)detour_top(
+		"gdi32.dll", "CreateFontIndirectA", (FARPROC)CreateFontIndirectU
+	);
+	return lower_CreateFontA(target,
+		cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic,
+		bUnderline, bStrikeOut, iCharSet, iOutPrecision,
+		iClipPrecision, iQuality, iPitchAndFamily, pszFaceName
+	);
+}
+
+HFONT WINAPI promote_CreateFontIndirectA(
+	__in CONST LOGFONTA *lplf
+)
+{
+	CreateFontIndirectExA_type target = (CreateFontIndirectExA_type)detour_top(
+		"gdi32.dll", "CreateFontIndirectExA", (FARPROC)CreateFontIndirectExU
+	);
+	return lower_CreateFontIndirectA(target, lplf);
+}
+/// -------------------
+
+void promote_mod_init(void)
+{
+	detour_chain("gdi32.dll", 0,
+		"CreateFontIndirectA", promote_CreateFontIndirectA,
+		"CreateFontA", promote_CreateFontA,
+		NULL
+	);
+}

thcrap/src/promote.h

@@ -0,0 +1,58 @@
+/**
+  * Touhou Community Reliant Automatic Patcher
+  * Main DLL
+  *
+  * ----
+  *
+  * Win32 detour function level promotion.
+  */
+
+#pragma once
+
+/**
+  * This module eliminates the redundancy in detouring certain Win32 function
+  * families - sets of functions that act as wrappers of decreasing levels
+  * around one functionality.
+  *
+  * This is done by detouring each individual wrapper with a function that
+  * merely converts and passes each level's parameters to the next one
+  * ("promoting"), terminating in an invocation of the detour chain for the
+  * lowest-level function.
+  *
+  * Other modules would then only have to detour a single function - the
+  * lowest-level one - to catch all calls to the whole family of functions,
+  * instead of detouring every function and duplicating all the promotion
+  * code required.
+  *
+  * For example, the CreateFont() family consists of three functions:
+  * CreateFont(), CreateFontIndirect() and CreateFontIndirectEx(). With the
+  * promotion module, it's enough to detour CreateFontIndirectEx() to catch
+  * all three functions.
+  */
+
+/// CreateFont() family (promoting to CreateFontIndirectExA)
+/// -------------------
+HFONT WINAPI promote_CreateFontA(
+	__in int cHeight,
+	__in int cWidth,
+	__in int cEscapement,
+	__in int cOrientation,
+	__in int cWeight,
+	__in DWORD bItalic,
+	__in DWORD bUnderline,
+	__in DWORD bStrikeOut,
+	__in DWORD iCharSet,
+	__in DWORD iOutPrecision,
+	__in DWORD iClipPrecision,
+	__in DWORD iQuality,
+	__in DWORD iPitchAndFamily,
+	__in_opt LPCSTR pszFaceName
+);
+
+HFONT WINAPI promote_CreateFontIndirectA(
+	__in CONST LOGFONTA *lplf
+);
+/// -------------------
+
+// Because we want these to be as low as possible... Nifty.
+void promote_mod_init(void);

thcrap/thcrap.def

@@ -205,6 +205,10 @@ EXPORTS
 	plugins_load
 	plugins_close
 
+	; Detour promotion
+	; ----------------
+	promote_mod_init
+
 	; Hot-repatching
 	; --------------
 	repatch_mod_init

thcrap/thcrap.vcxproj

@@ -59,6 +59,7 @@
     <ClCompile Include="src\patchfile.c" />
     <ClCompile Include="src\pe.c" />
     <ClCompile Include="src\plugin.c" />
+    <ClCompile Include="src\promote.c" />
     <ClCompile Include="src\repatch.c" />
     <ClCompile Include="src\sha256.c">
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
@@ -88,6 +89,7 @@
     <ClInclude Include="src\patchfile.h" />
     <ClInclude Include="src\pe.h" />
     <ClInclude Include="src\plugin.h" />
+    <ClInclude Include="src\promote.h" />
     <ClInclude Include="src\repatch.h" />
     <ClInclude Include="src\sha256.h" />
     <ClInclude Include="src\inject.h" />

thcrap/thcrap.vcxproj.filters

@@ -83,6 +83,9 @@
     <ClCompile Include="src\zip.c">
       <Filter>Source files</Filter>
     </ClCompile>
+    <ClCompile Include="src\promote.c">
+      <Filter>Source files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="src\binhack.h">
@@ -163,6 +166,9 @@
     <ClInclude Include="src\zip.h">
       <Filter>Source files</Filter>
     </ClInclude>
+    <ClInclude Include="src\promote.h">
+      <Filter>Source files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="thcrap.def">