quartz: Fix the 32-bits build on MacOSX 10.7

FMGetATSFontRefFromFont() is not public on Lion nor on 64-bits
Frameworks, but it seems to be available in the dynamic libs, hence we
can dlsym() it just like other private functions.

Works around the error:
cairo-quartz-font.c: In function 'cairo_quartz_font_face_create_for_atsu_font_id':
cairo-quartz-font.c:830: error: implicit declaration of function 'FMGetATSFontRefFromFont'

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=39493

2 files changed, 18 insertions, 10 deletions

diff --git a/src/cairo-quartz-font.c b/src/cairo-quartz-font.c
index 8b34ed81..53d5c35f 100644
--- a/src/cairo-quartz-font.c
+++ b/src/cairo-quartz-font.c
@@ -93,6 +93,9 @@ static int (*CGFontGetAscentPtr) (CGFontRef fontRef) = NULL;
 static int (*CGFontGetDescentPtr) (CGFontRef fontRef) = NULL;
 static int (*CGFontGetLeadingPtr) (CGFontRef fontRef) = NULL;
 
+/* Not public anymore in 64-bits nor in 10.7 */
+static ATSFontRef (*FMGetATSFontRefFromFontPtr) (FMFont iFont) = NULL;
+
 static cairo_bool_t _cairo_quartz_font_symbol_lookup_done = FALSE;
 static cairo_bool_t _cairo_quartz_font_symbols_present = FALSE;
 
@@ -132,6 +135,8 @@ quartz_font_ensure_symbols(void)
     CGContextGetAllowsFontSmoothingPtr = dlsym(RTLD_DEFAULT, "CGContextGetAllowsFontSmoothing");
     CGContextSetAllowsFontSmoothingPtr = dlsym(RTLD_DEFAULT, "CGContextSetAllowsFontSmoothing");
 
+    FMGetATSFontRefFromFontPtr = dlsym(RTLD_DEFAULT, "FMGetATSFontRefFromFont");
+
     if ((CGFontCreateWithFontNamePtr || CGFontCreateWithNamePtr) &&
 	CGFontGetGlyphBBoxesPtr &&
 	CGFontGetGlyphsForUnicharsPtr &&
@@ -805,7 +810,6 @@ _cairo_quartz_scaled_font_get_cg_font_ref (cairo_scaled_font_t *abstract_font)
     return ffont->cgFont;
 }
 
-#ifndef __LP64__
 /*
  * compat with old ATSUI backend
  */
@@ -826,15 +830,22 @@ _cairo_quartz_scaled_font_get_cg_font_ref (cairo_scaled_font_t *abstract_font)
 cairo_font_face_t *
 cairo_quartz_font_face_create_for_atsu_font_id (ATSUFontID font_id)
 {
-    ATSFontRef atsFont = FMGetATSFontRefFromFont (font_id);
-    CGFontRef cgFont = CGFontCreateWithPlatformFont (&atsFont);
-    cairo_font_face_t *ff;
+    quartz_font_ensure_symbols();
 
-    ff = cairo_quartz_font_face_create_for_cgfont (cgFont);
+    if (FMGetATSFontRefFromFontPtr != NULL) {
+	ATSFontRef atsFont = FMGetATSFontRefFromFontPtr (font_id);
+	CGFontRef cgFont = CGFontCreateWithPlatformFont (&atsFont);
+	cairo_font_face_t *ff;
 
-    CGFontRelease (cgFont);
+	ff = cairo_quartz_font_face_create_for_cgfont (cgFont);
+
+	CGFontRelease (cgFont);
 
-    return ff;
+	return ff;
+    } else {
+	_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
+	return (cairo_font_face_t *)&_cairo_font_face_nil;
+    }
 }
 
 /* This is the old name for the above function, exported for compat purposes */
@@ -845,4 +856,3 @@ cairo_atsui_font_face_create_for_atsu_font_id (ATSUFontID font_id)
 {
     return cairo_quartz_font_face_create_for_atsu_font_id (font_id);
 }
-#endif
diff --git a/src/cairo-quartz.h b/src/cairo-quartz.h
index 8d001c5c..9be5f9ae 100644
--- a/src/cairo-quartz.h
+++ b/src/cairo-quartz.h
@@ -66,10 +66,8 @@ cairo_quartz_surface_get_cg_context (cairo_surface_t *surface);
 cairo_public cairo_font_face_t *
 cairo_quartz_font_face_create_for_cgfont (CGFontRef font);
 
-#ifndef __LP64__
 cairo_public cairo_font_face_t *
 cairo_quartz_font_face_create_for_atsu_font_id (ATSUFontID font_id);
-#endif
 
 #endif /* CAIRO_HAS_QUARTZ_FONT */