tdf#101854 Move to CommonSalLayout removed faux bold in macos

Previously faux bold was drawn with setting a dictionary key
kCTStrokeWidthAttributeName and a value of the stroke width. This
stopped working because we don't use attributedString for drawing
anymore but we always use CTFontDrawGlyphs and draw the glyphs,
which doesn't have a way to set this attributes.

It took me a while to find a workaround (thanks to Apple's great
documentation), where we switch text drawing to fill and stroke,
and after that we can modify the stroke by changing the line
width.

Reviewed-on: https://gerrit.libreoffice.org/71012
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
(cherry picked from commit eb560651)

Change-Id: I594fcb9c796a9c04ea8234a9938ca2f719706199

vcl/inc/quartz/salgdi.h

@@ -102,6 +102,8 @@ public:
     /// text rotation in radian
     float               mfFontRotation;
     FontSelectPattern   maFontSelData;
+    /// faux bold - true, if font doesn't have proper bold variants
+    float mbFauxBold;
 
 private:
     /// CoreText text style object

vcl/quartz/ctfonts.cxx

@@ -49,6 +49,7 @@ CoreTextStyle::CoreTextStyle( const FontSelectPattern& rFSD )
     , mfFontStretch( 1.0 )
     , mfFontRotation( 0.0 )
     , maFontSelData( rFSD )
+    , mbFauxBold(false)
     , mpStyleDict( nullptr )
     , mpHbFont( nullptr )
 {
@@ -83,9 +84,7 @@ CoreTextStyle::CoreTextStyle( const FontSelectPattern& rFSD )
          ((mpFontData->GetWeight() < WEIGHT_SEMIBOLD) &&
           (mpFontData->GetWeight() != WEIGHT_DONTKNOW)) )
     {
-        int nStroke = -lrint((3.5F * pReqFont->GetWeight()) / mpFontData->GetWeight());
-        CFNumberRef rStroke = CFNumberCreate(nullptr, kCFNumberSInt32Type, &nStroke);
-        CFDictionarySetValue(mpStyleDict, kCTStrokeWidthAttributeName, rStroke);
+        mbFauxBold = true;
     }
 
     // fake italic

vcl/quartz/salgdi.cxx

@@ -467,6 +467,15 @@ void AquaSalGraphics::DrawTextLayout(const CommonSalLayout& rLayout)
     CGContextSetShouldAntialias(mrContext, !mbNonAntialiasedText);
     CGContextSetFillColor(mrContext, maTextColor.AsArray());
 
+    if (rStyle.mbFauxBold)
+    {
+
+        float fSize = rFontSelect.mnHeight / 23.0f;
+        CGContextSetStrokeColor(mrContext, maTextColor.AsArray());
+        CGContextSetLineWidth(mrContext, fSize);
+        CGContextSetTextDrawingMode(mrContext, kCGTextFillStroke);
+    }
+
     auto aIt = aGlyphOrientation.cbegin();
     while (aIt != aGlyphOrientation.cend())
     {