Disable some wxWebView tests that fail on the buildbot but not locally.
[wxWidgets.git] / misc / scripts / png2c.py
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1#!/usr/bin/python
2
3# This script is a slightly modified version of the original found at
4#
5# http://wiki.wxwidgets.org/Embedding_PNG_Images-Bin2c_In_Python
6#
7# without any copyright attribution so it is assumed it can be used under
8# wxWindows licence as the rest of the wiki material.
9
10import sys
11import os
12import os.path
13import re
14import array
15
16USAGE = """Usage: png2c [-s] [file...]
17Output input PNG files as C arrays to standard output. Used to embed PNG images
18in C code (like XPM but with full alpha channel support).
19
20 -s embed the image size in the image names in generated code."""
21
22if len(sys.argv) < 2:
23 print USAGE
24 sys.exit(1)
25
26r = re.compile("^([a-zA-Z._][a-zA-Z._0-9]*)[.][pP][nN][gG]$")
27
28with_size = 0
29size_suffix = ''
30for path in sys.argv[1:]:
31 if path == '-s':
32 with_size = 1
33 continue
34
35 filename = os.path.basename(path).replace('-','_')
36 m = r.match(filename)
37
38 # Allow only filenames that make sense as C variable names
39 if not(m):
40 print "Skipped file (unsuitable filename): " + filename
41 continue
42
43 # Read PNG file as character array
44 bytes = array.array('B', open(path, "rb").read())
45 count = len(bytes)
46
47 # Check that it's actually a PNG to avoid problems when loading it
48 # later.
49 #
50 # Each PNG file starts with a 8 byte signature that should be followed
51 # by IHDR chunk which is always 13 bytes in length so the first 16
52 # bytes are fixed (or at least we expect them to be).
53 if bytes[0:16].tostring() != '\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR':
54 print '"%s" doesn\'t seem to be a valid PNG file.' % filename
55 continue
56
57 # Try to naively get its size if necessary
58 if with_size:
59 def getInt(start):
60 """ Convert 4 bytes in network byte order to an integer. """
61 return 16777216*bytes[start] + \
62 65536*bytes[start+1] + \
63 256*bytes[start+2] + \
64 bytes[start+3];
65
66 size_suffix = "_%dx%d" % (getInt(16), getInt(20))
67
68 # Create the C header
69 text = "/* %s - %d bytes */\n" \
70 "static const unsigned char %s%s_png[] = {\n" % (
71 filename, count, m.group(1), size_suffix)
72
73 # Iterate the characters, we want
74 # lines like:
75 # 0x01, 0x02, .... (8 values per line maximum)
76 i = 0
77 count = len(bytes)
78 for byte in bytes:
79 # Every new line starts with two whitespaces
80 if (i % 8) == 0:
81 text += " "
82 # Then the hex data (up to 8 values per line)
83 text += "0x%02x" % (byte)
84 # Separate all but the last values
85 if (i % 8) == 7:
86 text += ',\n'
87 elif (i + 1) < count:
88 text += ", "
89 i += 1
90
91 # Now conclude the C source
92 text += "};\n\n"
93
94 print text