Fix PDF export with fallback fonts in Core Text

We need to pass the real font used to layout the glyphs in case it
differs from the requested font, otherwise we end with garbage in PDF
files.

Change-Id: I9caa8e60429e45ee864f5347fd9392f5e440864e
Reviewed-on: https://gerrit.libreoffice.org/4299
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>
Tested-by: Khaled Hosny <khaledhosny@eglug.org>

4 files changed, 46 insertions, 23 deletions

diff --git a/vcl/coretext/ctfonts.cxx b/vcl/coretext/ctfonts.cxx
index 19e325652857..3dcfe4fb0d61 100644
--- a/vcl/coretext/ctfonts.cxx
+++ b/vcl/coretext/ctfonts.cxx
@@ -36,22 +36,6 @@
 
 // =======================================================================
 
-// CoreText specific physically available font face
-class CTFontData
-:   public ImplMacFontData
-{
-public:
-    explicit                CTFontData( const ImplDevFontAttributes&, sal_IntPtr nFontId );
-    virtual                 ~CTFontData( void );
-    virtual PhysicalFontFace*   Clone( void ) const;
-
-    virtual ImplMacTextStyle*   CreateMacTextStyle( const FontSelectPattern& ) const;
-    virtual ImplFontEntry*      CreateFontInstance( /*const*/ FontSelectPattern& ) const;
-    virtual int                 GetFontTable( const char pTagName[5], unsigned char* ) const;
-};
-
-// =======================================================================
-
 class CTFontList
 :   public SystemFontList
 {
@@ -337,10 +321,8 @@ int CTFontData::GetFontTable( const char pTagName[5], unsigned char* pResultBuf
 
 // =======================================================================
 
-static void CTFontEnumCallBack( const void* pValue, void* pContext )
+ImplDevFontAttributes DevFontFromCTFontDescriptor( CTFontDescriptorRef pFD, bool* bFontEnabled )
 {
-    CTFontDescriptorRef pFD = static_cast<CTFontDescriptorRef>(pValue);
-
     // all CoreText fonts are device fonts that can rotate just fine
     ImplDevFontAttributes rDFA;
     rDFA.mbOrientation = true;
@@ -368,9 +350,12 @@ static void CTFontEnumCallBack( const void* pValue, void* pContext )
     rDFA.SetStyleName( GetOUString( pStyleName ) );
 
     // get font-enabled status
-    int bFontEnabled = FALSE;
-    CFNumberRef pFontEnabled = (CFNumberRef)CTFontDescriptorCopyAttribute( pFD, kCTFontEnabledAttribute );
-    CFNumberGetValue( pFontEnabled, kCFNumberIntType, &bFontEnabled );
+    if( bFontEnabled ) {
+        int bEnabled = FALSE;
+        CFNumberRef pEnabled = (CFNumberRef)CTFontDescriptorCopyAttribute( pFD, kCTFontEnabledAttribute );
+        CFNumberGetValue( pEnabled, kCFNumberIntType, &bEnabled );
+        *bFontEnabled = bEnabled;
+    }
 
     // get font attributes
     CFDictionaryRef pAttrDict = (CFDictionaryRef)CTFontDescriptorCopyAttribute( pFD, kCTFontTraitsAttribute );
@@ -429,6 +414,16 @@ static void CTFontEnumCallBack( const void* pValue, void* pContext )
     // TODO? also use the HEAD table if available to get more attributes
 //  CFDataRef CTFontCopyTable( CTFontRef, kCTFontTableHead, /*kCTFontTableOptionNoOptions*/kCTFontTableOptionExcludeSynthetic );
 
+    return rDFA;
+}
+
+static void CTFontEnumCallBack( const void* pValue, void* pContext )
+{
+    CTFontDescriptorRef pFD = static_cast<CTFontDescriptorRef>(pValue);
+
+    bool bFontEnabled;
+    ImplDevFontAttributes rDFA = DevFontFromCTFontDescriptor( pFD, &bFontEnabled );
+
     if( bFontEnabled)
     {
         const sal_IntPtr nFontId = (sal_IntPtr)pValue;
diff --git a/vcl/coretext/ctfonts.hxx b/vcl/coretext/ctfonts.hxx
index 1430c36cb9b3..605a2c10fbc2 100644
--- a/vcl/coretext/ctfonts.hxx
+++ b/vcl/coretext/ctfonts.hxx
@@ -46,4 +46,21 @@ private:
     CFMutableDictionaryRef  GetStyleDict( void ) const { return mpStyleDict; }
 };
 
+// CoreText specific physically available font face
+class CTFontData
+:   public ImplMacFontData
+{
+public:
+    explicit                CTFontData( const ImplDevFontAttributes&, sal_IntPtr nFontId );
+    explicit                CTFontData( CTFontDescriptorRef pFontDesc );
+    virtual                 ~CTFontData( void );
+    virtual PhysicalFontFace*   Clone( void ) const;
+
+    virtual ImplMacTextStyle*   CreateMacTextStyle( const FontSelectPattern& ) const;
+    virtual ImplFontEntry*      CreateFontInstance( /*const*/ FontSelectPattern& ) const;
+    virtual int                 GetFontTable( const char pTagName[5], unsigned char* ) const;
+};
+
+SystemFontList* GetCoretextFontList(void);
+ImplDevFontAttributes DevFontFromCTFontDescriptor( CTFontDescriptorRef, bool* );
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/coretext/ctlayout.cxx b/vcl/coretext/ctlayout.cxx
index 89ecf0933fb1..5fbcef1dbd93 100644
--- a/vcl/coretext/ctlayout.cxx
+++ b/vcl/coretext/ctlayout.cxx
@@ -294,6 +294,18 @@ int CTLayout::GetNextGlyphs( int nLen, sal_GlyphId* pGlyphIDs, Point& rPos, int&
         }
 
         const PhysicalFontFace* pFallbackFont = NULL;
+        if( pFallbackFonts ) {
+            CFDictionaryRef pRunAttributes = CTRunGetAttributes( pGlyphRun );
+            CTFontRef pRunFont = (CTFontRef)CFDictionaryGetValue( pRunAttributes, kCTFontAttributeName );
+
+            CFDictionaryRef pAttributes = mpTextStyle->GetStyleDict();
+            CTFontRef pFont = (CTFontRef)CFDictionaryGetValue( pAttributes, kCTFontAttributeName );
+            if ( !CFEqual( pRunFont,  pFont ) ) {
+                CTFontDescriptorRef pFontDesc = CTFontCopyFontDescriptor( pRunFont );
+                ImplDevFontAttributes rDevFontAttr = DevFontFromCTFontDescriptor( pFontDesc, NULL );
+                pFallbackFont = new CTFontData( rDevFontAttr, (sal_IntPtr)pFontDesc );
+            }
+        }
 
         // get the details for each interesting glyph
         // TODO: handle nLen>1
diff --git a/vcl/coretext/salgdi2.cxx b/vcl/coretext/salgdi2.cxx
index 9180c32a222d..97d18891c44b 100644
--- a/vcl/coretext/salgdi2.cxx
+++ b/vcl/coretext/salgdi2.cxx
@@ -399,7 +399,6 @@ void AquaSalGraphics::GetDevFontList( ImplDevFontList* pFontList )
     // through it as should be all event handlers
 
     SalData* pSalData = GetSalData();
-    SystemFontList* GetCoretextFontList(void); // forward declaration
     if( !pSalData->mpFontList )
         pSalData->mpFontList = GetCoretextFontList();