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let the text drawing path take a string it will not write to

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DrawTextToScreen takes STR16, a mutable wchar_t*, for a string it only
measures and prints. Quest Debug System.cpp picks its text with a conditional:

  DrawTextToScreen( gubFact[ usLoop1 ] ? L"True" : L"False", ... );

which has type const wchar_t*. clang-cl's MSVC compatibility lets a bare
string literal decay to wchar_t*, but not a const wchar_t* expression, so it
reports

  error: no matching function for call to 'DrawTextToScreen'
  note: candidate function not viable: 1st argument ('const wchar_t *')
  would lose const qualifier

The parameter is const-correct in every function DrawTextToScreen hands the
string on to, so the change follows the string down the call chain rather
than stopping at the top:

  DrawTextToScreen, ShadowText          Utils/WordWrap.h
  WFStringPixLength                     Utils/Font Control.h
  mprintf, StringPixLength,             sgp/Font.h
  VarFindFontCenterCoordinates,
  VarFindFontRightCoordinates
  WinFontStringPixLength                sgp/WinFont.h
  gprintfdirty                          TileEngine/Render Dirty.h

The varargs members of that list copy the format string into a local buffer
before doing anything with it, and the measuring ones walk it and return a
width; none of the nine assigns through the parameter. Where StringPixLength
casts the string to UINT16* to walk it, the cast and the local now carry the
const rather than dropping it.

Callers are unaffected: every one already passes something that converts to
const CHAR16*. Both configurations build with no new diagnostics, and the
parse sweep drops from 9 error sites in 7 files to 5 in 3.

To check the claim that nothing writes through these parameters, read the
nine bodies; each is short.
This commit is contained in:
Marco Antonio J. Costa
2026-07-23 19:29:55 -03:00
committed by majcosta
parent c6a4fdb393
commit b147e47856
10 changed files with 22 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Utils/WordWrap.cpp
+2 -2
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@@ -497,7 +497,7 @@ UINT16 DeleteWrappedString(WRAPPED_STRING *pWrappedString)
// do you want to display it using dirty rects, TRUE or FALSE
// flags for either LEFT_JUSTIFIED, CENTER_JUSTIFIED, RIGHT_JUSTIFIED
BOOLEAN DrawTextToScreen(STR16 pStr, UINT16 usLocX, UINT16 usLocY, UINT16 usWidth, INT32 iFont, UINT8 ubColor, UINT8 ubBackGroundColor, BOOLEAN fDirty, UINT32 ulFlags)
BOOLEAN DrawTextToScreen(const CHAR16* pStr, UINT16 usLocX, UINT16 usLocY, UINT16 usWidth, INT32 iFont, UINT8 ubColor, UINT8 ubBackGroundColor, BOOLEAN fDirty, UINT32 ulFlags)
{
UINT16 usPosX = 0, usPosY = 0;
UINT16 usFontHeight=0;
@@ -1874,7 +1874,7 @@ INT32 GetNewTotalYPositionOfThisString( INT32 iTotalYPosition, INT32 iPageSize,
return( iNewYPosition );
}
void ShadowText(UINT32 uiDestVSurface, STR16 pString, INT32 iFont, UINT16 usPosX, UINT16 usPosY )
void ShadowText(UINT32 uiDestVSurface, const CHAR16* pString, INT32 iFont, UINT16 usPosX, UINT16 usPosY )
{
UINT32 uiLength = StringPixLength( pString, iFont);
UINT16 usFontHeight = WFGetFontHeight( iFont );