46eada874a
When a PNG image exists in several sizes it makes sense to use its size as a suffix to distinguish the different versions, so update the png2c script to optionally allow to do this. Current implementation simply checks the PNG header directly to avoid any extra dependencies. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66502 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
90 lines
2.9 KiB
Python
Executable File
90 lines
2.9 KiB
Python
Executable File
#!/usr/bin/python
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# This script is a slightly modified version of the original found at
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#
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# http://wiki.wxwidgets.org/Embedding_PNG_Images-Bin2c_In_Python
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#
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# without any copyright attribution so it is assumed it can be used under
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# wxWindows licence as the rest of the wiki material.
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import sys
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import os
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import os.path
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import re
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import array
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USAGE = """Usage: png2c [-s] [file...]
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Output input PNG files as C arrays to standard output. Used to embed PNG images
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in C code (like XPM but with full alpha channel support).
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-s embed the image size in the image names in generated code."""
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if len(sys.argv) < 2:
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print USAGE
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sys.exit(1)
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r = re.compile("^([a-zA-Z._][a-zA-Z._0-9]*)[.][pP][nN][gG]$")
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with_size = 0
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size_suffix = ''
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for path in sys.argv[1:]:
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if path == '-s':
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with_size = 1
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continue
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filename = os.path.basename(path).replace('-','_')
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m = r.match(filename)
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# Allow only filenames that make sense as C variable names
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if not(m):
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print "Skipped file (unsuitable filename): " + filename
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continue
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# Read PNG file as character array
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bytes = array.array('B', open(path, "rb").read())
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count = len(bytes)
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# Check that it's actually a PNG to avoid problems when loading it
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# later.
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#
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# Each PNG file starts with a 8 byte signature that should be followed
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# by IHDR chunk which is always 13 bytes in length so the first 16
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# bytes are fixed (or at least we expect them to be).
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if bytes[0:16].tostring() != '\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR':
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print '"%s" doesn\'t seem to be a valid PNG file.' % filename
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continue
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# Try to naively get its size if necessary
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if with_size:
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width = bytes[19] + 16*bytes[18] + 256*bytes[17] + 4096*bytes[16]
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height = bytes[23] + 16*bytes[22] + 256*bytes[21] + 4096*bytes[20]
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size_suffix = "_%dx%d" % (width, height)
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# Create the C header
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text = "/* %s - %d bytes */\n" \
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"static const unsigned char %s%s_png[] = {\n" % (
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filename, count, m.group(1), size_suffix)
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# Iterate the characters, we want
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# lines like:
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# 0x01, 0x02, .... (8 values per line maximum)
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i = 0
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count = len(bytes)
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for byte in bytes:
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# Every new line starts with two whitespaces
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if (i % 8) == 0:
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text += " "
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# Then the hex data (up to 8 values per line)
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text += "0x%02x" % (byte)
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# Separate all but the last values
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if (i % 8) == 7:
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text += ',\n'
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elif (i + 1) < count:
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text += ", "
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i += 1
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# Now conclude the C source
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text += "};\n\n"
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print text
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