Cleanup: Remove GetUnitsPerEM and units_per_em. (#12656)

GetUnitsPerEM is never called.

src/fontcache.cpp

@@ -33,8 +33,7 @@ FontCacheSettings _fcsettings;
  * @param fs The size of the font.
  */
 FontCache::FontCache(FontSize fs) : parent(FontCache::Get(fs)), fs(fs), height(_default_font_height[fs]),
-		ascender(_default_font_ascender[fs]), descender(_default_font_ascender[fs] - _default_font_height[fs]),
-		units_per_em(1)
+		ascender(_default_font_ascender[fs]), descender(_default_font_ascender[fs] - _default_font_height[fs])
 {
 	assert(this->parent == nullptr || this->fs == this->parent->fs);
 	FontCache::caches[this->fs] = this;

src/fontcache.h

@@ -26,7 +26,6 @@ protected:
 	int height;                       ///< The height of the font.
 	int ascender;                     ///< The ascender value of the font.
 	int descender;                    ///< The descender value of the font.
-	int units_per_em;                 ///< The units per EM value of the font.
 
 public:
 	FontCache(FontSize fs);
@@ -60,12 +59,6 @@ public:
 	 */
 	inline int GetDescender() const{ return this->descender; }
 
-	/**
-	 * Get the units per EM value of the font.
-	 * @return The units per EM value of the font.
-	 */
-	inline int GetUnitsPerEM() const { return this->units_per_em; }
-
 	/**
 	 * Get the nominal font size of the font.
 	 * @return The nominal font size.

src/fontcache/freetypefontcache.cpp

@@ -105,7 +105,6 @@ void FreeTypeFontCache::SetFontSize(FontSize, FT_Face, int pixels)
 	}
 
 	if (err == FT_Err_Ok) {
-		this->units_per_em = this->face->units_per_EM;
 		this->ascender     = this->face->size->metrics.ascender >> 6;
 		this->descender    = this->face->size->metrics.descender >> 6;
 		this->height       = this->ascender - this->descender;

src/os/macosx/font_osx.cpp

@@ -166,7 +166,6 @@ void CoreTextFontCache::SetFontSize(int pixels)
 	/* Query the font metrics we needed. We generally round all values up to
 	 * make sure we don't inadvertently cut off a row or column of pixels,
 	 * except when determining glyph to glyph advances. */
-	this->units_per_em = CTFontGetUnitsPerEm(this->font.get());
 	this->ascender = (int)std::ceil(CTFontGetAscent(this->font.get()));
 	this->descender = -(int)std::ceil(CTFontGetDescent(this->font.get()));
 	this->height = this->ascender - this->descender;

src/os/windows/font_win32.cpp

@@ -168,7 +168,6 @@ void Win32FontCache::SetFontSize(int pixels)
 	POUTLINETEXTMETRIC otm = (POUTLINETEXTMETRIC)new BYTE[otmSize];
 	GetOutlineTextMetrics(this->dc, otmSize, otm);
 
-	this->units_per_em = otm->otmEMSquare;
 	this->ascender = otm->otmTextMetrics.tmAscent;
 	this->descender = otm->otmTextMetrics.tmDescent;
 	this->height = this->ascender + this->descender;