cocoa 64-bit: Core Text patch for Pango

With this patch, the font fallback mechanisms in `racket/draw'
can locate suitable replacement glyphs, the same as for the
Pango ATSUI back end.

src/download-libs.rkt

@@ -4,7 +4,7 @@
 (provide do-download)
 
 (define url-host "download.racket-lang.org")
-(define url-path "/libs/6/")
+(define url-path "/libs/7/")
 (define url-base (string-append "http://" url-host url-path))
 (define architecture #f) ;; set in `do-download'
 

src/get-libs.rkt

@@ -31,9 +31,9 @@
         ["libgio-2.0.0.dylib" 1511444]
         ["libjpeg.62.dylib" 412024]
         ["libglib-2.0.0.dylib" 1272192]
-        ["libpango-1.0.0.dylib" 351672]
+        ["libpango-1.0.0.dylib" 392432]
         ["libgmodule-2.0.0.dylib" 18820]
-        ["libpangocairo-1.0.0.dylib" 83728]
+        ["libpangocairo-1.0.0.dylib" 96352]
         ["libgobject-2.0.0.dylib" 308304]
         ["libpixman-1.0.dylib" 526716]
         ["libgthread-2.0.0.dylib" 12708]

src/mac/README.txt

@@ -28,6 +28,8 @@ Patches:
    // read_modules ();
  pango/modules/basic/basic-atsui.c:60: add
    if (!glyph) { glyph = PANGO_GET_UNKNOWN_GLYPH(glyph); }
+ pango/modules/basic/basic-coretext.c:
+   apply "coretext.patch"
  pango/pangocairo-atsuifont.c:141: add
   metrics->underline_position = -metrics->underline_position;
   pango_quantize_line_geometry (&metrics->underline_thickness,

src/mac/coretext.patch

@@ -0,0 +1,100 @@
+--- pango-1.29.5-orig/modules/basic/basic-coretext.c	2011-08-15 19:11:08.000000000 -0600
++++ pango-1.29.5/modules/basic/basic-coretext.c	2012-02-13 10:09:51.000000000 -0700
+@@ -58,6 +58,8 @@
+ {
+   PangoRectangle logical_rect;
+ 
++   if (!glyph) { glyph = PANGO_GET_UNKNOWN_GLYPH(glyph); }
++
+   glyphs->glyphs[i].glyph = glyph;
+ 
+   glyphs->glyphs[i].geometry.x_offset = 0;
+@@ -87,15 +89,15 @@
+   CFArrayRef runs;
+   CTRunRef run;
+   CTRunStatus run_status;
+-  CFIndex i, glyph_count;
++  CFIndex i, glyph_count, num_runs, run_index, run_offset, run_glyph_count;
+   const CGGlyph *cgglyphs;
+ 
+   CFTypeRef keys[] = {
+-      (CFTypeRef) kCTFontAttributeName
++    (CFTypeRef) kCTFontAttributeName
+   };
+ 
+   CFTypeRef values[] = {
+-      pango_core_text_font_get_ctfont (cfont)
++    pango_core_text_font_get_ctfont (cfont)
+   };
+ 
+   attributes = CFDictionaryCreate (kCFAllocatorDefault,
+@@ -120,13 +122,20 @@
+ 
+   runs = CTLineGetGlyphRuns (line);
+ 
+-  /* Since Pango divides things into runs already, we assume there is
+-   * only a single run in this line.
++  /* Since Pango divides things into runs already, we might assume there is
++   * only a single run in this line. However, unknown glyphs lead to
++   * separate runs.
+    */
+-  run = CFArrayGetValueAtIndex (runs, 0);
+-  run_status = CTRunGetStatus (run);
+-  glyph_count = CTRunGetGlyphCount (run);
+-  cgglyphs = CTRunGetGlyphsPtr (run);
++  num_runs = CFArrayGetCount (runs);
++  glyph_count = 0;
++  for (i = 0; i < num_runs; i++) {
++    run = CFArrayGetValueAtIndex (runs, i);
++    glyph_count += CTRunGetGlyphCount (run);
++  }
++  
++  run_offset = 0;
++  run_index = 0;
++  run_glyph_count = 0;
+ 
+   p = text;
+   pango_glyph_string_set_size (glyphs, glyph_count);
+@@ -135,10 +144,18 @@
+ 
+   for (i = 0; i < glyph_count; i++)
+     {
+-      CFIndex real_i, prev_i;
++      CFIndex real_i, prev_i, run_real_i;
+       gunichar wc;
+       gunichar mirrored_ch;
+ 
++      if (i - run_offset >= run_glyph_count) {
++        run_offset = i;
++        run = CFArrayGetValueAtIndex (runs, run_index++);
++        run_glyph_count = CTRunGetGlyphCount (run);
++        run_status = CTRunGetStatus (run);
++        cgglyphs = CTRunGetGlyphsPtr (run);
++      }
++
+       wc = g_utf8_get_char (p);
+ 
+       if (analysis->level % 2)
+@@ -147,11 +164,13 @@
+ 
+       if (run_status & kCTRunStatusRightToLeft)
+         {
++          run_real_i = run_glyph_count - (i - run_offset) - 1;
+           real_i = glyph_count - i - 1;
+           prev_i = real_i + 1;
+         }
+       else
+         {
++          run_real_i = i - run_offset;
+           real_i = i;
+           prev_i = real_i - 1;
+         }
+@@ -171,7 +190,7 @@
+ 
+           if (result != PANGO_COVERAGE_NONE)
+             {
+-              set_glyph (font, glyphs, real_i, p - text, cgglyphs[real_i]);
++              set_glyph (font, glyphs, real_i, p - text, cgglyphs[run_real_i]);
+ 
+               if (g_unichar_type (wc) == G_UNICODE_NON_SPACING_MARK)
+                 {