Resolves: fdo#33510 A way to query about likely font layout capabilities

2 files changed, 46 insertions, 0 deletions

diff --git a/vcl/aqua/inc/salgdi.h b/vcl/aqua/inc/salgdi.h
index 9d432a2b0ff3..8b2a9564bea3 100644
--- a/vcl/aqua/inc/salgdi.h
+++ b/vcl/aqua/inc/salgdi.h
@@ -61,6 +61,7 @@ public:
     virtual sal_IntPtr      GetFontId() const;
 
     ImplFontCharMap*        GetImplFontCharMap() const;
+    bool                    GetImplFontLayoutCapabilities(FontLayoutCapabilities &rGetImplFontLayoutCapabilities) const;
     bool                    HasChar( sal_uInt32 cChar ) const;
 
     void                    ReadOs2Table() const;
@@ -70,10 +71,12 @@ public:
 private:
     const ATSUFontID            mnFontId;
     mutable ImplFontCharMap*    mpCharMap;
+    mutable FontLayoutCapabilities maFontLayoutCapabilities;
     mutable bool                mbOs2Read;       // true if OS2-table related info is valid
     mutable bool                mbHasOs2Table;
     mutable bool                mbCmapEncodingRead; // true if cmap encoding of Mac font is read
     mutable bool                mbHasCJKSupport; // #i78970# CJK fonts need extra leading
+    mutable bool                mbFontLayoutCapabilitiesRead;
 };
 
 // abstracting quartz color instead of having to use an CGFloat[] array
@@ -283,6 +286,7 @@ public:
     virtual ULONG           GetKernPairs( ULONG nPairs, ImplKernPairData* pKernPairs );
     // get the repertoire of the current font
     virtual ImplFontCharMap* GetImplFontCharMap() const;
+    virtual bool GetImplFontLayoutCapabilities(FontLayoutCapabilities &rGetImplFontLayoutCapabilities) const;
     // graphics must fill supplied font list
     virtual void            GetDevFontList( ImplDevFontList* );
     // graphics should call ImplAddDevFontSubstitute on supplied
diff --git a/vcl/aqua/source/gdi/salgdi.cxx b/vcl/aqua/source/gdi/salgdi.cxx
index e15f1cd3a2c1..07b3cbb6e1dd 100644
--- a/vcl/aqua/source/gdi/salgdi.cxx
+++ b/vcl/aqua/source/gdi/salgdi.cxx
@@ -73,6 +73,7 @@ ImplMacFontData::ImplMacFontData( const ImplDevFontAttributes& rDFA, ATSUFontID
 ,   mbHasOs2Table( false )
 ,   mbCmapEncodingRead( false )
 ,   mbHasCJKSupport( false )
+,   mbFontLayoutCapabilitiesRead( false )
 {}
 
 // -----------------------------------------------------------------------
@@ -157,6 +158,39 @@ ImplFontCharMap* ImplMacFontData::GetImplFontCharMap() const
     return mpCharMap;
 }
 
+bool ImplMacFontData::GetImplFontLayoutCapabilities(FontLayoutCapabilities &rFontLayoutCapabilities)
+{
+    // read this only once per font
+    if( mbFontLayoutCapabilitiesRead )
+    {
+        rFontLayoutCapabilities = maFontLayoutCapabilities;
+        return !rFontLayoutCapabilities.empty();
+    }
+    mbFontLayoutCapabilitiesRead = true;
+
+    // prepare to get the GSUB table raw data
+    ATSFontRef rFont = FMGetATSFontRefFromFont( mnFontId );
+    ByteCount nBufSize = 0;
+    OSStatus eStatus = ATSFontGetTable( rFont, GetTag("GSUB"), 0, 0, NULL, &nBufSize );
+    if( eStatus != noErr )
+        return false;
+
+    // allocate a buffer for the GSUB raw data
+    ByteVector aBuffer( nBufSize );
+
+    // get the GSUB raw data
+    ByteCount nRawLength = 0;
+    eStatus = ATSFontGetTable( rFont, GetTag("GSUB"), 0, nBufSize, (void*)&aBuffer[0], &nRawLength );
+    if( eStatus != noErr )
+        return false;
+
+    const unsigned char* pGSUBTable = &aBuffer[0];
+    vcl::getTTFontLayoutCapabilities(maFontLayoutCapabilities, pGSUBTable);
+    rFontLayoutCapabilities = maFontLayoutCapabilities;
+
+    return !rFontLayoutCapabilities.empty()
+}
+
 // -----------------------------------------------------------------------
 
 void ImplMacFontData::ReadOs2Table( void ) const
@@ -1984,6 +2018,14 @@ ImplFontCharMap* AquaSalGraphics::GetImplFontCharMap() const
     return mpMacFontData->GetImplFontCharMap();
 }
 
+bool AquaSalGraphics::GetImplFontLayoutCapabilities(FontLayoutCapabilities &rFontLayoutCapabilities)
+{
+    if( !mpMacFontData )
+        return false;
+
+    return mpMacFontData->GetImplFontLayoutCapabilities(rFontLayoutCapabilities);
+}
+
 // -----------------------------------------------------------------------
 
 // fake a SFNT font directory entry for a font table