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annotate ext/libpng-1.2.29/contrib/pngminus/README @ 261:4fa875d06e28

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A workaround for a bug in SDL which makes the cursor jump when SDL_ShowCursor() is called. This patch does not completely fix the problem, but at least makes the editor usable in fullscreen mode.
author cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 09 Jun 2009 01:09:05 +0000
parents 4a0efb7baf70
children
rev   line source
0
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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1 PngMinus
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2 --------
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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3 (copyright Willem van Schaik, 1999)
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4
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5
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6 License
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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7 -------
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8
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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9 Permission to use, copy, modify, and distribute this software and
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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10 its documentation for any purpose and without fee is hereby granted,
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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11 provided that the above copyright notice appear in all copies and
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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12 that both that copyright notice and this permission notice appear in
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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13 supporting documentation. This software is provided "as is" without
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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14 express or implied warranty.
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15
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16
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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17 Some history
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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18 ------------
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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19 Soon after the creation of PNG in 1995, the need was felt for a set of
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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20 pnmtopng / pngtopnm utilities. Independantly Alexander Lehmann and I
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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21 (Willem van Schaik) started such a project. Luckily we discovered this
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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22 and merged the two together into pnmtopng.tar.gz, which is available
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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23 from a/o ftp://ftp.simplesystems.org/pub/libpng/png/.
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24
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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25 These two utilities have many, many options and make use of most of the
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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26 features of PNG, like gamma, alpha, sbit, text-chunks, etc. This makes
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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27 the utilities quite complex and by now not anymore very maintainable.
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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28 When we wrote these programs, libpng was still in an early stage.
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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29 Therefore, lots of the functionality that we put in our software can now
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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30 be done using transform-functions in libpng.
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31
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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32 Finally, to compile these programs, you need to have installed and
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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33 compiled three libraries: libpng, zlib and netpbm. Especially the latter
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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34 makes the whole setup a bit bulky. But that's unavoidable given the many
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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35 features of pnmtopng.
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36
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37
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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38 What now
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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39 --------
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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40 At this moment libpng is in a very stable state and can do much of the
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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41 work done in pnmtopng. Also, pnmtopng needs to be upgraded to the new
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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42 interface of libpng. Hence, it is time for a rewrite from the ground up
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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43 of pnmtopng and pngtopnm. This will happen in the near future (stay
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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44 tuned). The new package will get a different name to distinguish it from
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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45 the old one: PngPlus.
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46
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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47 To experiment a bit with the new interface of libpng, I started off with
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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48 a small prototype that contains only the basic functionality. It doesn't
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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49 have any of the options to read or write special chunks and it will do
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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50 no gamma correction. But this makes it also a simple program that is
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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51 quite easy to understand and can serve well as a template for other
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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52 software developments. (By now there are of course a couple of programs,
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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53 like Greg Roelofs' rpng/wpng, that can be used just as good.)
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54
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55
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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56 Can and can not
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57 ---------------
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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58 As this is the small brother of the future PngPlus, I called this fellow
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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59 PngMinus. Because I started this development in good-old Turbo-C, I
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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60 avoided the use the netpbm library, which requires DOS extenders. Again,
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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61 another reason to call it PngMinus (minus netpbm :-). So, part of the
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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62 program are some elementary routines to read / write pgm- and ppm-files.
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63 It does not read b&w pbm-files.
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64
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65 The downside of this approach is that you can not use them on images
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66 that require blocks of memory bigger than 64k (the DOS version). For
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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67 larger images you will get an out-of-memory error.
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68
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69 As said before, PngMinus doesn't correct for gamma. When reading
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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70 png-files you can do this just as well by piping the output of png2pnm
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71 to pnmgamma, one of the standard PbmPlus tools. This same scenario will
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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72 most probably also be followed in the full-blown future PngPlus, with
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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73 the addition of course of the possibility to create gamma-chunks when
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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74 writing png-files.
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75
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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76 On the other hand it supports alpha-channels. When reading a png-image
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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77 you can write the alpha-channel into a pgm-file. And when creating an
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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78 RGB+A png-image, you just combine a ppm-file with a corresponding
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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79 pgm-file containing the alpha-channel. When reading, transparency chunks
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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80 are converted into an alpha-channel and from there on treated the same
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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81 way.
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82
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83 Finally you can opt for writing ascii or binary pgm- and ppm-files. When
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84 the bit-depth is 16, the format will always be ascii.
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85
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86
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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87 Using it
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88 --------
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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89 To distinguish them from pnmtopng and PngPlus, the utilities are named
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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90 png2pnm and pnm2png (2 instead of to). The input- and output-files can
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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91 be given as parameters or through redirection. Therefore the programs
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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92 can be part of a pipe.
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93
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94 To list the options type "png2pnm -h" or "pnm2png -h".
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95
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96
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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97 Just like Scandinavian furniture
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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98 --------------------------------
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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99 You have to put it together yourself. I did test the software under
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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100 MS-DOS with Turbo-C 3.0 and under RedHat Linux 4.2 with gcc. In both
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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101 cases I used libpng-1.0.4 and zlib-1.1.3. Later versions should be OK,
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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102 however some older libpng versions have a bug in pngmem.c when using
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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103 Turbo-C 3.0 (see below).
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104
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105 You can build it using one of the two makefiles (make -f makefile.###)
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106 or use the batch/script files pngminus.bat / pngminus.sh. This assumes
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107 that you have built the libraries in ../libpng and ../zlib. Using Linux,
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108 make sure that you have built libpng with makefile.std and not
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109 makefile.linux (also called .lnx in earlier versions of libpng). The
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110 latter creates a .so shared-library, while the PngMinus makefile assumes
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111 a normal .a static library.
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112
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113 If you create a ../pngsuite directory and then store the basn####.png
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114 files from PngSuite (http://www.schaik.com/pngsuite/) in there, you can
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115 test in one go the proper functioning of PngMinus, see png2pnm.bat and
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116 pnm2png.bat (or the .sh versions).
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117
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118
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119 Warranty
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120 -------
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121 Please, remember that this was just a small experiment to learn a few
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122 things. It will have many unforeseen features <vbg>. Who said bugs? Use
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123 it when you are in need for something simple or when you want to start
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124 developing your own stuff.
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125
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126
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127 The Turbo bug
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128 -------------
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129 ** pngmem.old
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130 hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
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131 hptr += 16L;
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132 ** pngmem.c
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133 hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
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134 hptr = hptr + 16L;
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135 **
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136
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137 ** pngmem.old
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138 png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
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139 hptr += (png_uint_32)65536L;
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140 ** pngmem.c
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141 png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
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142 hptr = hptr + 65536L;
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143 **
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144
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145
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146 The end
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147 -------
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148 Willem van Schaik
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149 mailto:willem@schaik.com
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150 http://www.schaik.com/png/
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151 -------
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152 Oct 1999
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153