Turn on HarfBuzz support for Mac/Cocoa

It's possible to enable HarfBuzz text layout on Mac by either:

- Set QT_ENABLE_HARFBUZZ environment variable when running a Qt
  app.

- configure with -harfbuzz to build Qt, then HarfBuzz support
  will be turned on by default.

HarfBuzz will only be used when the font explicitly requested
is supported by HarfBuzz (aka. TrueType/OpenType font), other
fonts (AAT fonts) will still be handled by Core Text.

Using HarfBuzz for text layout will hopefully solve most tricky
complex text shaping bugs on Mac.

Task-number: QTBUG-17728
Reviewed-by: Eskil

1 files changed, 15 insertions, 1 deletions

diff --git a/configure b/configure
index 99b79fc..9b923ab 100755
--- a/configure
+++ b/configure
@@ -804,6 +804,7 @@ CFG_MAC_XARCH=auto
 CFG_MAC_CARBON=no
 CFG_MAC_COCOA=yes
 COMMANDLINE_MAC_CARBON=no
+CFG_MAC_HARFBUZZ=no
 CFG_SXE=no
 CFG_PREFIX_INSTALL=yes
 CFG_SDK=
@@ -1040,7 +1041,7 @@ while [ "$#" -gt 0 ]; do
         VAL=no
         ;;
     #Qt style yes options
-    -incremental|-qvfb|-profile|-shared|-static|-sm|-xinerama|-xshape|-xsync|-xinput|-egl|-reduce-exports|-pch|-separate-debug-info|-stl|-freetype|-xcursor|-xfixes|-xrandr|-xrender|-mitshm|-fontconfig|-xkb|-nis|-qdbus|-dbus|-dbus-linked|-glib|-gstreamer|-gtkstyle|-cups|-iconv|-largefile|-h|-help|-v|-verbose|-debug|-release|-fast|-accessibility|-confirm-license|-gnumake|-framework|-qt3support|-debug-and-release|-exceptions|-cocoa|-carbon|-universal|-prefix-install|-silent|-armfpa|-optimized-qmake|-dwarf2|-reduce-relocations|-sse|-openssl|-openssl-linked|-ptmalloc|-xmlpatterns|-phonon|-phonon-backend|-multimedia|-audio-backend|-svg|-declarative|-declarative-debug|-javascript-jit|-script|-scripttools|-rpath|-force-pkg-config|-s60|-usedeffiles)
+    -incremental|-qvfb|-profile|-shared|-static|-sm|-xinerama|-xshape|-xsync|-xinput|-egl|-reduce-exports|-pch|-separate-debug-info|-stl|-freetype|-xcursor|-xfixes|-xrandr|-xrender|-mitshm|-fontconfig|-xkb|-nis|-qdbus|-dbus|-dbus-linked|-glib|-gstreamer|-gtkstyle|-cups|-iconv|-largefile|-h|-help|-v|-verbose|-debug|-release|-fast|-accessibility|-confirm-license|-gnumake|-framework|-qt3support|-debug-and-release|-exceptions|-cocoa|-carbon|-universal|-harfbuzz|-prefix-install|-silent|-armfpa|-optimized-qmake|-dwarf2|-reduce-relocations|-sse|-openssl|-openssl-linked|-ptmalloc|-xmlpatterns|-phonon|-phonon-backend|-multimedia|-audio-backend|-svg|-declarative|-declarative-debug|-javascript-jit|-script|-scripttools|-rpath|-force-pkg-config|-s60|-usedeffiles)
         VAR=`echo $1 | sed "s,^-\(.*\),\1,"`
         VAL=yes
         ;;
@@ -1498,6 +1499,13 @@ while [ "$#" -gt 0 ]; do
             UNKNOWN_OPT=yes
         fi
         ;;
+    harfbuzz)
+        if [ "$PLATFORM_MAC" = "yes" ] && [ "$CFG_MAC_CARBON" != "yes" ] && [ "$VAL" = "yes" ]; then
+            CFG_MAC_HARFBUZZ="$VAL"
+        else
+            UNKNOWN_OPT=yes
+        fi
+        ;;
 
     framework)
         if [ "$PLATFORM_MAC" = "yes" ] || [ "$PLATFORM_QPA" = "yes" ]; then
@@ -4245,6 +4253,11 @@ Qt/Mac only:
     -sdk <sdk> ......... Build Qt using Apple provided SDK <sdk>. This option requires gcc 4.
                          To use a different SDK with gcc 3.3, set the SDKROOT environment variable.
 
+    -harfbuzz .......... Use HarfBuzz to do text layout instead of Core Text when possible.
+                         It is only available to Cocoa builds.
+ *  -no-harfbuzz ....... Disable HarfBuzz on Mac. It can still be enabled by setting
+                         QT_ENABLE_HARFBUZZ environment variable.
+
 EOF
 fi
 
@@ -7209,6 +7222,7 @@ fi
 [ "$CFG_NAS" = "system" ] && QT_CONFIG="$QT_CONFIG nas"
 [ "$CFG_OPENSSL" = "yes" ] && QT_CONFIG="$QT_CONFIG openssl"
 [ "$CFG_OPENSSL" = "linked" ] && QT_CONFIG="$QT_CONFIG openssl-linked"
+[ "$CFG_MAC_HARFBUZZ" = "yes" ] && QT_CONFIG="$QT_CONFIG harfbuzz"
 
 if [ "$PLATFORM_X11" = "yes" ]; then
     [ "$CFG_SM" = "yes" ] && QT_CONFIG="$QT_CONFIG x11sm"