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

1 files changed, 42 insertions, 0 deletions

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