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annotate ext/libpng-1.2.29/contrib/gregbook/README @ 140:3fddb45c0304

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edited the loaders, images are now loaded only once into memory
author thebastion@33b003aa-7bff-0310-803a-e67f0ece8222
date Sun, 28 Sep 2008 11:12:36 +0000
parents 4a0efb7baf70
children
rev   line source
0
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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1 ===========================
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2 PNG: The Definitive Guide
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3 ===========================
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4
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5 Source Code
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6
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7 Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free,
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8 cross-platform demo programs that show how to use the libpng reference
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9 library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is
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10 a very simple example that that shows how a standard file-viewer might use
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11 libpng, while the second is designed to process streaming data and shows
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12 how a web browser might be written. wpng is a simple command-line program
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13 that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets
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14 of PBMPLUS/NetPBM) and converts them to PNG.
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15
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16 The source code for all three demo programs currently compiles under
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17 Unix, OpenVMS, and 32-bit Windows. (Special thanks to Martin Zinser,
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18 zinser@decus.de, for making the necessary changes for OpenVMS and for
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19 providing an appropriate build script.) Build instructions can be found
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20 below.
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21
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22 Files:
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23
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24 README this file
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25 LICENSE terms of distribution and reuse (BSD-like or GNU GPL)
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26 COPYING GNU General Public License (GPL)
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27
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28 Makefile.unx Unix makefile
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29 Makefile.w32 Windows (MSVC) makefile
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30 makevms.com OpenVMS build script
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31
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32 rpng-win.c Windows front end for the basic viewer
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33 rpng-x.c X Window System (Unix, OpenVMS) front end
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34 readpng.c generic back end for the basic viewer
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35 readpng.h header file for the basic viewer
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36
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37 rpng2-win.c Windows front end for the progressive viewer
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38 rpng2-x.c X front end for the progressive viewer
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39 readpng2.c generic back end for the progressive viewer
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40 readpng2.h header file for the progressive viewer
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41
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42 wpng.c generic (text) front end for the converter
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43 writepng.c generic back end for the converter
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44 writepng.h header file for the converter
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45
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46 toucan.png transparent PNG for testing (by Stefan Schneider)
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47
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48 Note that, although the programs are designed to be functional, their
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49 primary purpose is to illustrate how to use libpng to add PNG support to
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50 other programs. As such, their user interfaces are crude and definitely
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51 are not intended for everyday use.
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52
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53 Please see http://www.libpng.org/pub/png/pngbook.html for further infor-
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54 mation and links to the latest version of the source code, and Chapters
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55 13-15 of the book for detailed discussion of the three programs.
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56
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57 Greg Roelofs
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58 http://pobox.com/~newt/greg_contact.html
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59 16 March 2008
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60
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61
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62 BUILD INSTRUCTIONS
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63
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64 - Prerequisites (in order of compilation):
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65
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66 - zlib http://zlib.net/
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67 - libpng http://www.libpng.org/pub/png/libpng.html
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68 - pngbook http://www.libpng.org/pub/png/book/sources.html
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69
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70 The pngbook demo programs are explicitly designed to demonstrate proper
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71 coding techniques for using the libpng reference library. As a result,
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72 you need to download and build both zlib (on which libpng depends) and
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73 libpng. A common build setup is to place the zlib, libpng and pngbook
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74 subdirectory trees ("folders") in the same parent directory. Then the
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75 libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]),
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76 and similarly for the pngbook build.
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77
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78 Note that all three packages are designed to be built from a command
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79 line by default; those who wish to use a graphical or other integrated
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80 development environments are on their own.
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81
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82
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83 - Unix:
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84
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85 Unpack the latest pngbook sources (which should correspond to this
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86 README file) into a directory and change into that directory.
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87
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88 Copy Makefile.unx to Makefile and edit the PNG* and Z* variables
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89 appropriately (possibly also the X* variables if necessary).
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90
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91 make
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92
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93 There is no "install" target, so copy the three executables somewhere
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94 in your path or run them from the current directory. All three will
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95 print a basic usage screen when run without any command-line arguments;
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96 see the book for more details.
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97
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98
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99 - Windows:
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100
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101 Unpack the latest pngbook sources (which should correspond to this
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102 README file) into a folder, open a "DOS shell" or "command prompt"
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103 or equivalent command-line window, and cd into the folder where you
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104 unpacked the source code.
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105
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106 For MSVC, set up the necessary environment variables by invoking
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107
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108 %devstudio%\vc\bin\vcvars32.bat
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109
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110 where where %devstudio% is the installation directory for MSVC /
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111 DevStudio. If you get "environment out of space" errors under 95/98,
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112 create a desktop shortcut with "c:\windows\command.com /e:4096" as
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113 the program command line and set the working directory to the pngbook
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114 directory. Then double-click to open the new DOS-prompt window with
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115 a bigger environment and retry the commands above.
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116
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117 Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables
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118 appropriately (possibly also the "INC" and "LIB" variables if needed).
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119 Note that the names of the dynamic and static libpng and zlib libraries
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120 used in the makefile may change in later releases of the libraries.
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121 Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work.
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122 This makefile therefore builds statically linked executables, but if
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123 the DLL problems ever get fixed, uncommenting the appropriate PNGLIB
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124 and ZLIB lines will build dynamically linked executables instead.
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125
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126 Do the build by typing
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127
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128 nmake
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129
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130 The result should be three executables: rpng-win.exe, rpng2-win.exe,
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131 and wpng.exe. Copy them somewhere in your PATH or run them from the
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132 current folder. Like the Unix versions, the two windowed programs
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133 (rpng and rpng2) now display a usage screen in a console window when
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134 invoked without command-line arguments; this is new behavior as of
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135 the June 2001 release. Note that the programs use the Unix-style "-"
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136 character to specify options, instead of the more common DOS/Windows
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137 "/" character. (For example: "rpng2-win -bgpat 4 foo.png", not
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138 "rpng2-win /bgpat 4 foo.png")
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139
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140
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141 - OpenVMS:
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142
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143 Unpack the pngbook sources into a subdirectory and change into that
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144 subdirectory.
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145
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146 Edit makevms.com appropriately, specifically the zpath and pngpath
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147 variables.
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148
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149 @makevms
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150
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151 To run the programs, they probably first need to be set up as "foreign
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152 symbols," with "disk" and "dir" set appropriately:
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153
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154 $ rpng == "$disk:[dir]rpng-x.exe"
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155 $ rpng2 == "$disk:[dir]rpng2-x.exe"
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156 $ wpng == "$disk:[dir]wpng.exe"
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157
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158 All three will print a basic usage screen when run without any command-
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159 line arguments; see the book for more details. Note that the options
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160 style is Unix-like, i.e., preceded by "-" rather than "/".
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161
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162
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163 RUNNING THE PROGRAMS: (VERY) BRIEF INTRO
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164
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165 rpng is a simple PNG viewer that can display transparent PNGs with a
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166 specified background color; for example,
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167
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168 rpng -bgcolor #ff0000 toucan.png
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169
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170 would display the image with a red background. rpng2 is a progressive
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171 viewer that simulates a web browser in some respects; it can display
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172 images against either a background color or a dynamically generated
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173 background image. For example:
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174
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175 rpng2 -bgpat 16 toucan.png
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176
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177 wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
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178 format (.pgm or .ppm) to PNG; for example,
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179
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180 wpng -time < toucan-notrans.ppm > toucan-notrans.png
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181
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182 would convert the specified PPM file (using redirection) to PNG, auto-
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183 matically setting the PNG modification-time chunk.
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184
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185 All options can be abbreviated to the shortest unique value; for example,
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186 "-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma.