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annotate ext/libpng-1.2.29/contrib/pngminus/README @ 502:96c4922c1c24

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Added some imports to the world initialization code. I had to do this because you were not able to use the editor with the shooter demo map files without manually adding the imports to the map file. You do not have to do this now (note the TODO in the comments). I have also hard coded the camera zoom level to ensure the map editors zoom level at the time of saving the map is not used.
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 18 May 2010 14:48:33 +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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3 (copyright Willem van Schaik, 1999)
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4
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5
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6 License
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7 -------
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8
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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9 Permission to use, copy, modify, and distribute this software and
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10 its documentation for any purpose and without fee is hereby granted,
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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11 provided that the above copyright notice appear in all copies and
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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
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14 express or implied warranty.
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15
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16
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17 Some history
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18 ------------
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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
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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21 (Willem van Schaik) started such a project. Luckily we discovered this
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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
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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.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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28 When we wrote these programs, libpng was still in an early stage.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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29 Therefore, lots of the functionality that we put in our software can now
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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
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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
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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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39 --------
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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
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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41 work done in pnmtopng. Also, pnmtopng needs to be upgraded to the new
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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
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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43 of pnmtopng and pngtopnm. This will happen in the near future (stay
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44 tuned). The new package will get a different name to distinguish it from
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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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49 have any of the options to read or write special chunks and it will do
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50 no gamma correction. But this makes it also a simple program that is
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51 quite easy to understand and can serve well as a template for other
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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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56 Can and can not
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57 ---------------
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58 As this is the small brother of the future PngPlus, I called this fellow
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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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61 another reason to call it PngMinus (minus netpbm :-). So, part of the
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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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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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72 most probably also be followed in the full-blown future PngPlus, with
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73 the addition of course of the possibility to create gamma-chunks when
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74 writing png-files.
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75
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76 On the other hand it supports alpha-channels. When reading a png-image
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77 you can write the alpha-channel into a pgm-file. And when creating an
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78 RGB+A png-image, you just combine a ppm-file with a corresponding
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79 pgm-file containing the alpha-channel. When reading, transparency chunks
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80 are converted into an alpha-channel and from there on treated the same
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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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87 Using it
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88 --------
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89 To distinguish them from pnmtopng and PngPlus, the utilities are named
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90 png2pnm and pnm2png (2 instead of to). The input- and output-files can
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91 be given as parameters or through redirection. Therefore the programs
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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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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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102 however some older libpng versions have a bug in pngmem.c when using
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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