quartz: Restore 10.4-specific font code

The code for extracting font glyphs was replaced in
70cc8f250b5669e757b4f044571ba0f71e3dea9e with an implementation based
on CoreText, which is not available on MacOSX 10.4.  This commit
restores automatic detection of which API should be used by means of
dynamic linking.

3 files changed, 31 insertions, 9 deletions

diff --git a/README b/README
index 0be9947d5..7ee2c1878 100644
--- a/README
+++ b/README
@@ -121,7 +121,7 @@ Supported, "platform" surface backends
 
 	quartz backend
 	--------------
-	MacOS X >= 10.5 with Xcode >= 3.0
+	MacOS X >= 10.4 with Xcode >= 2.5
 
 	win32 backend
 	-------------
diff --git a/src/cairo-quartz-font.c b/src/cairo-quartz-font.c
index feee61a0d..897b2d01a 100644
--- a/src/cairo-quartz-font.c
+++ b/src/cairo-quartz-font.c
@@ -81,6 +81,14 @@ static void (*CGFontGetGlyphsForUnicharsPtr) (CGFontRef, const UniChar[], const
 static void (*CGContextSetAllowsFontSmoothingPtr) (CGContextRef, bool) = NULL;
 static bool (*CGContextGetAllowsFontSmoothingPtr) (CGContextRef) = NULL;
 
+/* Not public in the least bit */
+static CGPathRef (*CGFontGetGlyphPathPtr) (CGFontRef fontRef, CGAffineTransform *textTransform, int unknown, CGGlyph glyph) = NULL;
+
+/* CTFontCreateWithGraphicsFont is not available until 10.5 */
+typedef const struct __CTFontDescriptor *CTFontDescriptorRef;
+static CTFontRef (*CTFontCreateWithGraphicsFontPtr) (CGFontRef, CGFloat, const CGAffineTransform*, CTFontDescriptorRef) = NULL;
+static CGPathRef (*CTFontCreatePathForGlyphPtr) (CTFontRef, CGGlyph, CGAffineTransform *) = NULL;
+
 /* CGFontGetHMetrics isn't public, but the other functions are public/present in 10.5 */
 typedef struct {
     int ascent;
@@ -125,6 +133,11 @@ quartz_font_ensure_symbols(void)
     CGFontGetUnitsPerEmPtr = dlsym(RTLD_DEFAULT, "CGFontGetUnitsPerEm");
     CGFontGetGlyphAdvancesPtr = dlsym(RTLD_DEFAULT, "CGFontGetGlyphAdvances");
 
+    CTFontCreateWithGraphicsFontPtr = dlsym(RTLD_DEFAULT, "CTFontCreateWithGraphicsFont");
+    CTFontCreatePathForGlyphPtr = dlsym(RTLD_DEFAULT, "CTFontCreatePathForGlyph");
+    if (!CTFontCreateWithGraphicsFontPtr || !CTFontCreatePathForGlyphPtr)
+	CGFontGetGlyphPathPtr = dlsym(RTLD_DEFAULT, "CGFontGetGlyphPath");
+
     CGFontGetHMetricsPtr = dlsym(RTLD_DEFAULT, "CGFontGetHMetrics");
     CGFontGetAscentPtr = dlsym(RTLD_DEFAULT, "CGFontGetAscent");
     CGFontGetDescentPtr = dlsym(RTLD_DEFAULT, "CGFontGetDescent");
@@ -140,6 +153,7 @@ quartz_font_ensure_symbols(void)
 	CGFontGetGlyphsForUnicharsPtr &&
 	CGFontGetUnitsPerEmPtr &&
 	CGFontGetGlyphAdvancesPtr &&
+	((CTFontCreateWithGraphicsFontPtr && CTFontCreatePathForGlyphPtr) || CGFontGetGlyphPathPtr) &&
 	(CGFontGetHMetricsPtr || (CGFontGetAscentPtr && CGFontGetDescentPtr && CGFontGetLeadingPtr)))
 	_cairo_quartz_font_symbols_present = TRUE;
 
@@ -545,7 +559,6 @@ _cairo_quartz_init_glyph_path (cairo_quartz_scaled_font_t *font,
     CGGlyph glyph = _cairo_quartz_scaled_glyph_index (scaled_glyph);
     CGAffineTransform textMatrix;
     CGPathRef glyphPath;
-    CTFontRef ctFont;
     cairo_path_fixed_t *path;
 
     if (glyph == INVALID_GLYPH) {
@@ -560,9 +573,14 @@ _cairo_quartz_init_glyph_path (cairo_quartz_scaled_font_t *font,
 					-font->base.scale.yy,
 					0, 0);
 
-    ctFont = CTFontCreateWithGraphicsFont (font_face->cgFont, 1.0, NULL, NULL);
-    glyphPath = CTFontCreatePathForGlyph (ctFont, glyph, &textMatrix);
-    CFRelease (ctFont);
+    if (CTFontCreateWithGraphicsFontPtr && CTFontCreatePathForGlyphPtr) {
+	CTFontRef ctFont = CTFontCreateWithGraphicsFontPtr (font_face->cgFont, 1.0, NULL, NULL);
+	glyphPath = CTFontCreatePathForGlyphPtr (ctFont, glyph, &textMatrix);
+	CFRelease (ctFont);
+    } else {
+	glyphPath = CGFontGetGlyphPathPtr (font_face->cgFont, &textMatrix, 0, glyph);
+    }
+
     if (!glyphPath)
 	return CAIRO_INT_STATUS_UNSUPPORTED;
 
diff --git a/src/cairo-quartz-private.h b/src/cairo-quartz-private.h
index 3ef14c3ae..42e1f9e91 100644
--- a/src/cairo-quartz-private.h
+++ b/src/cairo-quartz-private.h
@@ -44,12 +44,13 @@
 #include "cairo-quartz.h"
 #include "cairo-surface-clipper-private.h"
 
-#ifdef CGFLOAT_DEFINED
-typedef CGFloat cairo_quartz_float_t;
-#else
-typedef float cairo_quartz_float_t;
+#ifndef CGFLOAT_DEFINED
+/* On 10.4, Quartz APIs used float instead of CGFloat */
+typedef float CGFloat;
 #endif
 
+typedef CGFloat cairo_quartz_float_t;
+
 typedef enum {
     DO_DIRECT,
     DO_SHADING,
@@ -57,6 +58,9 @@ typedef enum {
     DO_TILED_IMAGE
 } cairo_quartz_action_t;
 
+/* define CTFontRef for pre-10.5 SDKs */
+typedef const struct __CTFont *CTFontRef;
+
 typedef struct cairo_quartz_surface {
     cairo_surface_t base;