Implement DrawTitleBarBitmap() for OS X using hard coded PNG images.

Use a simple implementation working under all OS X versions, including 10.4
which doesn't have standard system images for the close button.

Added the images themselves under art/osx and png2c.py helper script to
convert them to a form used in C++ code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62300 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

misc/scripts/png2c.py

@@ -0,0 +1,63 @@
+#!/usr/bin/python
+
+# This script is a slightly modified version of the original found at
+#
+#       http://wiki.wxwidgets.org/Embedding_PNG_Images-Bin2c_In_Python
+#
+# without any copyright attribution so it is assumed it can be used under
+# wxWindows licence as the rest of the wiki material.
+
+import sys
+import os
+import os.path
+import re
+import array
+
+USAGE = """png2c - Embed a PNG in a C header file (like XPM)
+Usage: png2c [file ..] Output input PNG files as C structures on stdout"""
+
+if len(sys.argv) < 2:
+        print USAGE
+        sys.exit(1)
+
+r = re.compile("^([a-zA-Z._][a-zA-Z._0-9]*)[.][pP][nN][gG]$")
+
+for path in sys.argv[1:]:
+        filename = os.path.basename(path)
+        m = r.match(filename)
+        # Allow only filenames that make sense
+        # as C variable names
+        if not(m):
+                print "Skipped file (unsuitable filename): " + filename
+                continue
+
+        # Read PNG file as character array
+        bytes = array.array('B', open(path, "rb").read())
+        count = len(bytes)
+
+        # Create the C header
+        text = "/* %s - %d bytes */\n" \
+               "static const unsigned char %s_png[] = {\n" % (filename, count, m.group(1))
+
+        # Iterate the characters, we want
+        # lines like:
+        #   0x01, 0x02, .... (8 values per line maximum)
+        i = 0
+        count = len(bytes)
+        for byte in bytes:
+                # Every new line starts with two whitespaces
+                if (i % 8) == 0:
+                        text += "  "
+                # Then the hex data (up to 8 values per line)
+                text += "0x%02x" % (byte)
+                # Separate all but the last values
+                if (i + 1) < count:
+                        text += ", "
+                if (i % 8) == 7:
+                        text += '\n'
+                i += 1
+
+        # Now conclude the C source
+        text += "};\n\n"
+
+        print text