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#!/usr/bin/env python
import sys
import os
import os.path
import re
import array
## no need to call this manually, use make_header_from_png.sh instead
##
USAGE = """png2c - Embed a PNG in a C header file (like XPM)
Usage: png2c [file ..] Convert all the file <file.png> to <file.png.h>"""
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/* End Of File */\n"
open(path + ".h", 'w').write(text)
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