1 | /*--------------------------------------------------------------------------- |
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2 | |
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3 | rpng - simple PNG display program rpng-x.c |
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4 | |
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5 | This program decodes and displays PNG images, with gamma correction and |
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6 | optionally with a user-specified background color (in case the image has |
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7 | transparency). It is very nearly the most basic PNG viewer possible. |
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8 | This version is for the X Window System (tested by author under Unix and |
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9 | by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking). |
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10 | |
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11 | to do: |
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12 | - 8-bit (colormapped) X support |
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13 | - use %.1023s to simplify truncation of title-bar string? |
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14 | |
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15 | --------------------------------------------------------------------------- |
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16 | |
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17 | Changelog: |
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18 | - 1.01: initial public release |
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19 | - 1.02: modified to allow abbreviated options; fixed long/ulong mis- |
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20 | match; switched to png_jmpbuf() macro |
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21 | - 1.10: added support for non-default visuals; fixed X pixel-conversion |
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22 | - 1.11: added extra set of parentheses to png_jmpbuf() macro; fixed |
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23 | command-line parsing bug |
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24 | - 1.12: fixed some small X memory leaks (thanks to François Petitjean) |
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25 | - 1.13: fixed XFreeGC() crash bug (thanks to Patrick Welche) |
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26 | - 1.14: added support for X resources (thanks to Gerhard Niklasch) |
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27 | - 2.00: dual-licensed (added GNU GPL) |
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28 | - 2.01: fixed improper display of usage screen on PNG error(s) |
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29 | |
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30 | --------------------------------------------------------------------------- |
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31 | |
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32 | Copyright (c) 1998-2008 Greg Roelofs. All rights reserved. |
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33 | |
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34 | This software is provided "as is," without warranty of any kind, |
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35 | express or implied. In no event shall the author or contributors |
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36 | be held liable for any damages arising in any way from the use of |
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37 | this software. |
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38 | |
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39 | The contents of this file are DUAL-LICENSED. You may modify and/or |
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40 | redistribute this software according to the terms of one of the |
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41 | following two licenses (at your option): |
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42 | |
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43 | |
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44 | LICENSE 1 ("BSD-like with advertising clause"): |
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45 | |
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46 | Permission is granted to anyone to use this software for any purpose, |
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47 | including commercial applications, and to alter it and redistribute |
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48 | it freely, subject to the following restrictions: |
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49 | |
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50 | 1. Redistributions of source code must retain the above copyright |
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51 | notice, disclaimer, and this list of conditions. |
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52 | 2. Redistributions in binary form must reproduce the above copyright |
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53 | notice, disclaimer, and this list of conditions in the documenta- |
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54 | tion and/or other materials provided with the distribution. |
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55 | 3. All advertising materials mentioning features or use of this |
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56 | software must display the following acknowledgment: |
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57 | |
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58 | This product includes software developed by Greg Roelofs |
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59 | and contributors for the book, "PNG: The Definitive Guide," |
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60 | published by O'Reilly and Associates. |
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61 | |
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62 | |
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63 | LICENSE 2 (GNU GPL v2 or later): |
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64 | |
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65 | This program is free software; you can redistribute it and/or modify |
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66 | it under the terms of the GNU General Public License as published by |
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67 | the Free Software Foundation; either version 2 of the License, or |
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68 | (at your option) any later version. |
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69 | |
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70 | This program is distributed in the hope that it will be useful, |
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71 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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72 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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73 | GNU General Public License for more details. |
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74 | |
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75 | You should have received a copy of the GNU General Public License |
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76 | along with this program; if not, write to the Free Software Foundation, |
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77 | Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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78 | |
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79 | ---------------------------------------------------------------------------*/ |
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80 | |
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81 | #define PROGNAME "rpng-x" |
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82 | #define LONGNAME "Simple PNG Viewer for X" |
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83 | #define VERSION "2.01 of 16 March 2008" |
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84 | #define RESNAME "rpng" /* our X resource application name */ |
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85 | #define RESCLASS "Rpng" /* our X resource class name */ |
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86 | |
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87 | #include <stdio.h> |
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88 | #include <stdlib.h> |
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89 | #include <string.h> |
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90 | #include <time.h> |
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91 | #include <X11/Xlib.h> |
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92 | #include <X11/Xutil.h> |
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93 | #include <X11/Xos.h> |
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94 | #include <X11/keysym.h> |
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95 | |
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96 | /* #define DEBUG : this enables the Trace() macros */ |
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97 | |
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98 | #include "readpng.h" /* typedefs, common macros, readpng prototypes */ |
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99 | |
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100 | |
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101 | /* could just include png.h, but this macro is the only thing we need |
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102 | * (name and typedefs changed to local versions); note that side effects |
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103 | * only happen with alpha (which could easily be avoided with |
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104 | * "ush acopy = (alpha);") */ |
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105 | |
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106 | #define alpha_composite(composite, fg, alpha, bg) { \ |
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107 | ush temp = ((ush)(fg)*(ush)(alpha) + \ |
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108 | (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \ |
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109 | (composite) = (uch)((temp + (temp >> 8)) >> 8); \ |
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110 | } |
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111 | |
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112 | |
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113 | /* local prototypes */ |
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114 | static int rpng_x_create_window(void); |
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115 | static int rpng_x_display_image(void); |
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116 | static void rpng_x_cleanup(void); |
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117 | static int rpng_x_msb(ulg u32val); |
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118 | |
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119 | |
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120 | static char titlebar[1024], *window_name = titlebar; |
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121 | static char *appname = LONGNAME; |
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122 | static char *icon_name = PROGNAME; |
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123 | static char *res_name = RESNAME; |
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124 | static char *res_class = RESCLASS; |
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125 | static char *filename; |
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126 | static FILE *infile; |
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127 | |
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128 | static char *bgstr; |
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129 | static uch bg_red=0, bg_green=0, bg_blue=0; |
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130 | |
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131 | static double display_exponent; |
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132 | |
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133 | static ulg image_width, image_height, image_rowbytes; |
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134 | static int image_channels; |
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135 | static uch *image_data; |
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136 | |
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137 | /* X-specific variables */ |
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138 | static char *displayname; |
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139 | static XImage *ximage; |
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140 | static Display *display; |
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141 | static int depth; |
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142 | static Visual *visual; |
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143 | static XVisualInfo *visual_list; |
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144 | static int RShift, GShift, BShift; |
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145 | static ulg RMask, GMask, BMask; |
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146 | static Window window; |
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147 | static GC gc; |
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148 | static Colormap colormap; |
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149 | |
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150 | static int have_nondefault_visual = FALSE; |
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151 | static int have_colormap = FALSE; |
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152 | static int have_window = FALSE; |
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153 | static int have_gc = FALSE; |
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154 | /* |
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155 | ulg numcolors=0, pixels[256]; |
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156 | ush reds[256], greens[256], blues[256]; |
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157 | */ |
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158 | |
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159 | |
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160 | |
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161 | |
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162 | int main(int argc, char **argv) |
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163 | { |
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164 | #ifdef sgi |
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165 | char tmpline[80]; |
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166 | #endif |
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167 | char *p; |
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168 | int rc, alen, flen; |
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169 | int error = 0; |
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170 | int have_bg = FALSE; |
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171 | double LUT_exponent; /* just the lookup table */ |
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172 | double CRT_exponent = 2.2; /* just the monitor */ |
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173 | double default_display_exponent; /* whole display system */ |
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174 | XEvent e; |
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175 | KeySym k; |
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176 | |
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177 | |
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178 | displayname = (char *)NULL; |
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179 | filename = (char *)NULL; |
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180 | |
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181 | |
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182 | /* First set the default value for our display-system exponent, i.e., |
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183 | * the product of the CRT exponent and the exponent corresponding to |
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184 | * the frame-buffer's lookup table (LUT), if any. This is not an |
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185 | * exhaustive list of LUT values (e.g., OpenStep has a lot of weird |
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186 | * ones), but it should cover 99% of the current possibilities. */ |
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187 | |
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188 | #if defined(NeXT) |
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189 | LUT_exponent = 1.0 / 2.2; |
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190 | /* |
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191 | if (some_next_function_that_returns_gamma(&next_gamma)) |
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192 | LUT_exponent = 1.0 / next_gamma; |
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193 | */ |
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194 | #elif defined(sgi) |
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195 | LUT_exponent = 1.0 / 1.7; |
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196 | /* there doesn't seem to be any documented function to get the |
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197 | * "gamma" value, so we do it the hard way */ |
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198 | infile = fopen("/etc/config/system.glGammaVal", "r"); |
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199 | if (infile) { |
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200 | double sgi_gamma; |
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201 | |
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202 | fgets(tmpline, 80, infile); |
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203 | fclose(infile); |
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204 | sgi_gamma = atof(tmpline); |
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205 | if (sgi_gamma > 0.0) |
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206 | LUT_exponent = 1.0 / sgi_gamma; |
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207 | } |
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208 | #elif defined(Macintosh) |
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209 | LUT_exponent = 1.8 / 2.61; |
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210 | /* |
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211 | if (some_mac_function_that_returns_gamma(&mac_gamma)) |
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212 | LUT_exponent = mac_gamma / 2.61; |
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213 | */ |
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214 | #else |
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215 | LUT_exponent = 1.0; /* assume no LUT: most PCs */ |
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216 | #endif |
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217 | |
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218 | /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */ |
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219 | default_display_exponent = LUT_exponent * CRT_exponent; |
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220 | |
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221 | |
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222 | /* If the user has set the SCREEN_GAMMA environment variable as suggested |
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223 | * (somewhat imprecisely) in the libpng documentation, use that; otherwise |
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224 | * use the default value we just calculated. Either way, the user may |
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225 | * override this via a command-line option. */ |
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226 | |
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227 | if ((p = getenv("SCREEN_GAMMA")) != NULL) |
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228 | display_exponent = atof(p); |
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229 | else |
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230 | display_exponent = default_display_exponent; |
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231 | |
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232 | |
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233 | /* Now parse the command line for options and the PNG filename. */ |
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234 | |
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235 | while (*++argv && !error) { |
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236 | if (!strncmp(*argv, "-display", 2)) { |
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237 | if (!*++argv) |
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238 | ++error; |
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239 | else |
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240 | displayname = *argv; |
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241 | } else if (!strncmp(*argv, "-gamma", 2)) { |
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242 | if (!*++argv) |
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243 | ++error; |
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244 | else { |
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245 | display_exponent = atof(*argv); |
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246 | if (display_exponent <= 0.0) |
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247 | ++error; |
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248 | } |
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249 | } else if (!strncmp(*argv, "-bgcolor", 2)) { |
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250 | if (!*++argv) |
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251 | ++error; |
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252 | else { |
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253 | bgstr = *argv; |
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254 | if (strlen(bgstr) != 7 || bgstr[0] != '#') |
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255 | ++error; |
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256 | else |
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257 | have_bg = TRUE; |
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258 | } |
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259 | } else { |
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260 | if (**argv != '-') { |
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261 | filename = *argv; |
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262 | if (argv[1]) /* shouldn't be any more args after filename */ |
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263 | ++error; |
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264 | } else |
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265 | ++error; /* not expecting any other options */ |
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266 | } |
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267 | } |
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268 | |
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269 | if (!filename) |
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270 | ++error; |
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271 | |
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272 | |
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273 | /* print usage screen if any errors up to this point */ |
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274 | |
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275 | if (error) { |
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276 | fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname); |
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277 | readpng_version_info(); |
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278 | fprintf(stderr, "\n" |
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279 | "Usage: %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n" |
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280 | " xdpy\tname of the target X display (e.g., ``hostname:0'')\n" |
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281 | " exp \ttransfer-function exponent (``gamma'') of the display\n" |
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282 | "\t\t system in floating-point format (e.g., ``%.1f''); equal\n" |
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283 | "\t\t to the product of the lookup-table exponent (varies)\n" |
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284 | "\t\t and the CRT exponent (usually 2.2); must be positive\n" |
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285 | " bg \tdesired background color in 7-character hex RGB format\n" |
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286 | "\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n" |
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287 | "\t\t used with transparent images\n" |
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288 | "\nPress Q, Esc or mouse button 1 (within image window, after image\n" |
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289 | "is displayed) to quit.\n" |
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290 | "\n", PROGNAME, default_display_exponent); |
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291 | exit(1); |
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292 | } |
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293 | |
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294 | |
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295 | if (!(infile = fopen(filename, "rb"))) { |
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296 | fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename); |
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297 | ++error; |
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298 | } else { |
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299 | if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) { |
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300 | switch (rc) { |
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301 | case 1: |
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302 | fprintf(stderr, PROGNAME |
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303 | ": [%s] is not a PNG file: incorrect signature\n", |
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304 | filename); |
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305 | break; |
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306 | case 2: |
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307 | fprintf(stderr, PROGNAME |
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308 | ": [%s] has bad IHDR (libpng longjmp)\n", filename); |
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309 | break; |
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310 | case 4: |
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311 | fprintf(stderr, PROGNAME ": insufficient memory\n"); |
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312 | break; |
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313 | default: |
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314 | fprintf(stderr, PROGNAME |
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315 | ": unknown readpng_init() error\n"); |
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316 | break; |
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317 | } |
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318 | ++error; |
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319 | } else { |
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320 | display = XOpenDisplay(displayname); |
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321 | if (!display) { |
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322 | readpng_cleanup(TRUE); |
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323 | fprintf(stderr, PROGNAME ": can't open X display [%s]\n", |
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324 | displayname? displayname : "default"); |
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325 | ++error; |
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326 | } |
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327 | } |
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328 | if (error) |
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329 | fclose(infile); |
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330 | } |
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331 | |
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332 | |
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333 | if (error) { |
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334 | fprintf(stderr, PROGNAME ": aborting.\n"); |
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335 | exit(2); |
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336 | } |
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337 | |
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338 | |
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339 | /* set the title-bar string, but make sure buffer doesn't overflow */ |
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340 | |
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341 | alen = strlen(appname); |
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342 | flen = strlen(filename); |
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343 | if (alen + flen + 3 > 1023) |
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344 | sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023)); |
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345 | else |
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346 | sprintf(titlebar, "%s: %s", appname, filename); |
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347 | |
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348 | |
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349 | /* if the user didn't specify a background color on the command line, |
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350 | * check for one in the PNG file--if not, the initialized values of 0 |
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351 | * (black) will be used */ |
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352 | |
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353 | if (have_bg) { |
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354 | unsigned r, g, b; /* this approach quiets compiler warnings */ |
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355 | |
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356 | sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b); |
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357 | bg_red = (uch)r; |
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358 | bg_green = (uch)g; |
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359 | bg_blue = (uch)b; |
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360 | } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) { |
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361 | readpng_cleanup(TRUE); |
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362 | fprintf(stderr, PROGNAME |
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363 | ": libpng error while checking for background color\n"); |
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364 | exit(2); |
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365 | } |
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366 | |
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367 | |
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368 | /* do the basic X initialization stuff, make the window and fill it |
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369 | * with the background color */ |
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370 | |
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371 | if (rpng_x_create_window()) |
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372 | exit(2); |
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373 | |
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374 | |
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375 | /* decode the image, all at once */ |
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376 | |
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377 | Trace((stderr, "calling readpng_get_image()\n")) |
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378 | image_data = readpng_get_image(display_exponent, &image_channels, |
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379 | &image_rowbytes); |
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380 | Trace((stderr, "done with readpng_get_image()\n")) |
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381 | |
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382 | |
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383 | /* done with PNG file, so clean up to minimize memory usage (but do NOT |
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384 | * nuke image_data!) */ |
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385 | |
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386 | readpng_cleanup(FALSE); |
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387 | fclose(infile); |
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388 | |
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389 | if (!image_data) { |
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390 | fprintf(stderr, PROGNAME ": unable to decode PNG image\n"); |
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391 | exit(3); |
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392 | } |
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393 | |
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394 | |
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395 | /* display image (composite with background if requested) */ |
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396 | |
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397 | Trace((stderr, "calling rpng_x_display_image()\n")) |
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398 | if (rpng_x_display_image()) { |
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399 | free(image_data); |
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400 | exit(4); |
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401 | } |
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402 | Trace((stderr, "done with rpng_x_display_image()\n")) |
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403 | |
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404 | |
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405 | /* wait for the user to tell us when to quit */ |
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406 | |
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407 | printf( |
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408 | "Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"); |
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409 | fflush(stdout); |
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410 | |
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411 | do |
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412 | XNextEvent(display, &e); |
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413 | while (!(e.type == ButtonPress && e.xbutton.button == Button1) && |
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414 | !(e.type == KeyPress && /* v--- or 1 for shifted keys */ |
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415 | ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape) )); |
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416 | |
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417 | |
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418 | /* OK, we're done: clean up all image and X resources and go away */ |
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419 | |
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420 | rpng_x_cleanup(); |
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421 | |
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422 | return 0; |
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423 | } |
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424 | |
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425 | |
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426 | |
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427 | |
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428 | |
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429 | static int rpng_x_create_window(void) |
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430 | { |
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431 | uch *xdata; |
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432 | int need_colormap = FALSE; |
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433 | int screen, pad; |
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434 | ulg bg_pixel = 0L; |
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435 | ulg attrmask; |
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436 | Window root; |
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437 | XEvent e; |
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438 | XGCValues gcvalues; |
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439 | XSetWindowAttributes attr; |
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440 | XTextProperty windowName, *pWindowName = &windowName; |
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441 | XTextProperty iconName, *pIconName = &iconName; |
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442 | XVisualInfo visual_info; |
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443 | XSizeHints *size_hints; |
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444 | XWMHints *wm_hints; |
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445 | XClassHint *class_hints; |
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446 | |
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447 | |
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448 | screen = DefaultScreen(display); |
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449 | depth = DisplayPlanes(display, screen); |
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450 | root = RootWindow(display, screen); |
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451 | |
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452 | #ifdef DEBUG |
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453 | XSynchronize(display, True); |
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454 | #endif |
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455 | |
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456 | #if 0 |
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457 | /* GRR: add 8-bit support */ |
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458 | if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) { |
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459 | fprintf(stderr, |
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460 | "screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n", |
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461 | depth); |
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462 | return 2; |
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463 | } |
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464 | |
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465 | XMatchVisualInfo(display, screen, depth, |
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466 | (depth == 8)? PseudoColor : TrueColor, &visual_info); |
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467 | visual = visual_info.visual; |
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468 | #else |
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469 | if (depth != 16 && depth != 24 && depth != 32) { |
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470 | int visuals_matched = 0; |
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471 | |
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472 | Trace((stderr, "default depth is %d: checking other visuals\n", |
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473 | depth)) |
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474 | |
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475 | /* 24-bit first */ |
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476 | visual_info.screen = screen; |
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477 | visual_info.depth = 24; |
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478 | visual_list = XGetVisualInfo(display, |
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479 | VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched); |
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480 | if (visuals_matched == 0) { |
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481 | /* GRR: add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */ |
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482 | fprintf(stderr, "default screen depth %d not supported, and no" |
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483 | " 24-bit visuals found\n", depth); |
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484 | return 2; |
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485 | } |
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486 | Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n", |
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487 | visuals_matched)) |
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488 | visual = visual_list[0].visual; |
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489 | depth = visual_list[0].depth; |
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490 | /* |
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491 | colormap_size = visual_list[0].colormap_size; |
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492 | visual_class = visual->class; |
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493 | visualID = XVisualIDFromVisual(visual); |
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494 | */ |
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495 | have_nondefault_visual = TRUE; |
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496 | need_colormap = TRUE; |
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497 | } else { |
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498 | XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info); |
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499 | visual = visual_info.visual; |
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500 | } |
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501 | #endif |
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502 | |
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503 | RMask = visual->red_mask; |
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504 | GMask = visual->green_mask; |
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505 | BMask = visual->blue_mask; |
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506 | |
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507 | /* GRR: add/check 8-bit support */ |
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508 | if (depth == 8 || need_colormap) { |
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509 | colormap = XCreateColormap(display, root, visual, AllocNone); |
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510 | if (!colormap) { |
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511 | fprintf(stderr, "XCreateColormap() failed\n"); |
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512 | return 2; |
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513 | } |
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514 | have_colormap = TRUE; |
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515 | } |
---|
516 | if (depth == 15 || depth == 16) { |
---|
517 | RShift = 15 - rpng_x_msb(RMask); /* these are right-shifts */ |
---|
518 | GShift = 15 - rpng_x_msb(GMask); |
---|
519 | BShift = 15 - rpng_x_msb(BMask); |
---|
520 | } else if (depth > 16) { |
---|
521 | #define NO_24BIT_MASKS |
---|
522 | #ifdef NO_24BIT_MASKS |
---|
523 | RShift = rpng_x_msb(RMask) - 7; /* these are left-shifts */ |
---|
524 | GShift = rpng_x_msb(GMask) - 7; |
---|
525 | BShift = rpng_x_msb(BMask) - 7; |
---|
526 | #else |
---|
527 | RShift = 7 - rpng_x_msb(RMask); /* these are right-shifts, too */ |
---|
528 | GShift = 7 - rpng_x_msb(GMask); |
---|
529 | BShift = 7 - rpng_x_msb(BMask); |
---|
530 | #endif |
---|
531 | } |
---|
532 | if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) { |
---|
533 | fprintf(stderr, "rpng internal logic error: negative X shift(s)!\n"); |
---|
534 | return 2; |
---|
535 | } |
---|
536 | |
---|
537 | /*--------------------------------------------------------------------------- |
---|
538 | Finally, create the window. |
---|
539 | ---------------------------------------------------------------------------*/ |
---|
540 | |
---|
541 | attr.backing_store = Always; |
---|
542 | attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask; |
---|
543 | attrmask = CWBackingStore | CWEventMask; |
---|
544 | if (have_nondefault_visual) { |
---|
545 | attr.colormap = colormap; |
---|
546 | attr.background_pixel = 0; |
---|
547 | attr.border_pixel = 1; |
---|
548 | attrmask |= CWColormap | CWBackPixel | CWBorderPixel; |
---|
549 | } |
---|
550 | |
---|
551 | window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0, |
---|
552 | depth, InputOutput, visual, attrmask, &attr); |
---|
553 | |
---|
554 | if (window == None) { |
---|
555 | fprintf(stderr, "XCreateWindow() failed\n"); |
---|
556 | return 2; |
---|
557 | } else |
---|
558 | have_window = TRUE; |
---|
559 | |
---|
560 | if (depth == 8) |
---|
561 | XSetWindowColormap(display, window, colormap); |
---|
562 | |
---|
563 | if (!XStringListToTextProperty(&window_name, 1, pWindowName)) |
---|
564 | pWindowName = NULL; |
---|
565 | if (!XStringListToTextProperty(&icon_name, 1, pIconName)) |
---|
566 | pIconName = NULL; |
---|
567 | |
---|
568 | /* OK if any hints allocation fails; XSetWMProperties() allows NULLs */ |
---|
569 | |
---|
570 | if ((size_hints = XAllocSizeHints()) != NULL) { |
---|
571 | /* window will not be resizable */ |
---|
572 | size_hints->flags = PMinSize | PMaxSize; |
---|
573 | size_hints->min_width = size_hints->max_width = (int)image_width; |
---|
574 | size_hints->min_height = size_hints->max_height = (int)image_height; |
---|
575 | } |
---|
576 | |
---|
577 | if ((wm_hints = XAllocWMHints()) != NULL) { |
---|
578 | wm_hints->initial_state = NormalState; |
---|
579 | wm_hints->input = True; |
---|
580 | /* wm_hints->icon_pixmap = icon_pixmap; */ |
---|
581 | wm_hints->flags = StateHint | InputHint /* | IconPixmapHint */ ; |
---|
582 | } |
---|
583 | |
---|
584 | if ((class_hints = XAllocClassHint()) != NULL) { |
---|
585 | class_hints->res_name = res_name; |
---|
586 | class_hints->res_class = res_class; |
---|
587 | } |
---|
588 | |
---|
589 | XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0, |
---|
590 | size_hints, wm_hints, class_hints); |
---|
591 | |
---|
592 | /* various properties and hints no longer needed; free memory */ |
---|
593 | if (pWindowName) |
---|
594 | XFree(pWindowName->value); |
---|
595 | if (pIconName) |
---|
596 | XFree(pIconName->value); |
---|
597 | if (size_hints) |
---|
598 | XFree(size_hints); |
---|
599 | if (wm_hints) |
---|
600 | XFree(wm_hints); |
---|
601 | if (class_hints) |
---|
602 | XFree(class_hints); |
---|
603 | |
---|
604 | XMapWindow(display, window); |
---|
605 | |
---|
606 | gc = XCreateGC(display, window, 0, &gcvalues); |
---|
607 | have_gc = TRUE; |
---|
608 | |
---|
609 | /*--------------------------------------------------------------------------- |
---|
610 | Fill window with the specified background color. |
---|
611 | ---------------------------------------------------------------------------*/ |
---|
612 | |
---|
613 | if (depth == 24 || depth == 32) { |
---|
614 | bg_pixel = ((ulg)bg_red << RShift) | |
---|
615 | ((ulg)bg_green << GShift) | |
---|
616 | ((ulg)bg_blue << BShift); |
---|
617 | } else if (depth == 16) { |
---|
618 | bg_pixel = ((((ulg)bg_red << 8) >> RShift) & RMask) | |
---|
619 | ((((ulg)bg_green << 8) >> GShift) & GMask) | |
---|
620 | ((((ulg)bg_blue << 8) >> BShift) & BMask); |
---|
621 | } else /* depth == 8 */ { |
---|
622 | |
---|
623 | /* GRR: add 8-bit support */ |
---|
624 | |
---|
625 | } |
---|
626 | |
---|
627 | XSetForeground(display, gc, bg_pixel); |
---|
628 | XFillRectangle(display, window, gc, 0, 0, image_width, image_height); |
---|
629 | |
---|
630 | /*--------------------------------------------------------------------------- |
---|
631 | Wait for first Expose event to do any drawing, then flush. |
---|
632 | ---------------------------------------------------------------------------*/ |
---|
633 | |
---|
634 | do |
---|
635 | XNextEvent(display, &e); |
---|
636 | while (e.type != Expose || e.xexpose.count); |
---|
637 | |
---|
638 | XFlush(display); |
---|
639 | |
---|
640 | /*--------------------------------------------------------------------------- |
---|
641 | Allocate memory for the X- and display-specific version of the image. |
---|
642 | ---------------------------------------------------------------------------*/ |
---|
643 | |
---|
644 | if (depth == 24 || depth == 32) { |
---|
645 | xdata = (uch *)malloc(4*image_width*image_height); |
---|
646 | pad = 32; |
---|
647 | } else if (depth == 16) { |
---|
648 | xdata = (uch *)malloc(2*image_width*image_height); |
---|
649 | pad = 16; |
---|
650 | } else /* depth == 8 */ { |
---|
651 | xdata = (uch *)malloc(image_width*image_height); |
---|
652 | pad = 8; |
---|
653 | } |
---|
654 | |
---|
655 | if (!xdata) { |
---|
656 | fprintf(stderr, PROGNAME ": unable to allocate image memory\n"); |
---|
657 | return 4; |
---|
658 | } |
---|
659 | |
---|
660 | ximage = XCreateImage(display, visual, depth, ZPixmap, 0, |
---|
661 | (char *)xdata, image_width, image_height, pad, 0); |
---|
662 | |
---|
663 | if (!ximage) { |
---|
664 | fprintf(stderr, PROGNAME ": XCreateImage() failed\n"); |
---|
665 | free(xdata); |
---|
666 | return 3; |
---|
667 | } |
---|
668 | |
---|
669 | /* to avoid testing the byte order every pixel (or doubling the size of |
---|
670 | * the drawing routine with a giant if-test), we arbitrarily set the byte |
---|
671 | * order to MSBFirst and let Xlib worry about inverting things on little- |
---|
672 | * endian machines (like Linux/x86, old VAXen, etc.)--this is not the most |
---|
673 | * efficient approach (the giant if-test would be better), but in the |
---|
674 | * interest of clarity, we take the easy way out... */ |
---|
675 | |
---|
676 | ximage->byte_order = MSBFirst; |
---|
677 | |
---|
678 | return 0; |
---|
679 | |
---|
680 | } /* end function rpng_x_create_window() */ |
---|
681 | |
---|
682 | |
---|
683 | |
---|
684 | |
---|
685 | |
---|
686 | static int rpng_x_display_image(void) |
---|
687 | { |
---|
688 | uch *src; |
---|
689 | char *dest; |
---|
690 | uch r, g, b, a; |
---|
691 | ulg i, row, lastrow = 0; |
---|
692 | ulg pixel; |
---|
693 | int ximage_rowbytes = ximage->bytes_per_line; |
---|
694 | /* int bpp = ximage->bits_per_pixel; */ |
---|
695 | |
---|
696 | |
---|
697 | Trace((stderr, "beginning display loop (image_channels == %d)\n", |
---|
698 | image_channels)) |
---|
699 | Trace((stderr, " (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n", |
---|
700 | image_width, image_rowbytes, ximage_rowbytes)) |
---|
701 | Trace((stderr, " (bpp = %d)\n", ximage->bits_per_pixel)) |
---|
702 | Trace((stderr, " (byte_order = %s)\n", ximage->byte_order == MSBFirst? |
---|
703 | "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown"))) |
---|
704 | |
---|
705 | if (depth == 24 || depth == 32) { |
---|
706 | ulg red, green, blue; |
---|
707 | |
---|
708 | for (lastrow = row = 0; row < image_height; ++row) { |
---|
709 | src = image_data + row*image_rowbytes; |
---|
710 | dest = ximage->data + row*ximage_rowbytes; |
---|
711 | if (image_channels == 3) { |
---|
712 | for (i = image_width; i > 0; --i) { |
---|
713 | red = *src++; |
---|
714 | green = *src++; |
---|
715 | blue = *src++; |
---|
716 | #ifdef NO_24BIT_MASKS |
---|
717 | pixel = (red << RShift) | |
---|
718 | (green << GShift) | |
---|
719 | (blue << BShift); |
---|
720 | /* recall that we set ximage->byte_order = MSBFirst above */ |
---|
721 | /* GRR BUG: this assumes bpp == 32, but may be 24: */ |
---|
722 | *dest++ = (char)((pixel >> 24) & 0xff); |
---|
723 | *dest++ = (char)((pixel >> 16) & 0xff); |
---|
724 | *dest++ = (char)((pixel >> 8) & 0xff); |
---|
725 | *dest++ = (char)( pixel & 0xff); |
---|
726 | #else |
---|
727 | red = (RShift < 0)? red << (-RShift) : red >> RShift; |
---|
728 | green = (GShift < 0)? green << (-GShift) : green >> GShift; |
---|
729 | blue = (BShift < 0)? blue << (-BShift) : blue >> BShift; |
---|
730 | pixel = (red & RMask) | (green & GMask) | (blue & BMask); |
---|
731 | /* recall that we set ximage->byte_order = MSBFirst above */ |
---|
732 | *dest++ = (char)((pixel >> 24) & 0xff); |
---|
733 | *dest++ = (char)((pixel >> 16) & 0xff); |
---|
734 | *dest++ = (char)((pixel >> 8) & 0xff); |
---|
735 | *dest++ = (char)( pixel & 0xff); |
---|
736 | #endif |
---|
737 | } |
---|
738 | } else /* if (image_channels == 4) */ { |
---|
739 | for (i = image_width; i > 0; --i) { |
---|
740 | r = *src++; |
---|
741 | g = *src++; |
---|
742 | b = *src++; |
---|
743 | a = *src++; |
---|
744 | if (a == 255) { |
---|
745 | red = r; |
---|
746 | green = g; |
---|
747 | blue = b; |
---|
748 | } else if (a == 0) { |
---|
749 | red = bg_red; |
---|
750 | green = bg_green; |
---|
751 | blue = bg_blue; |
---|
752 | } else { |
---|
753 | /* this macro (from png.h) composites the foreground |
---|
754 | * and background values and puts the result into the |
---|
755 | * first argument */ |
---|
756 | alpha_composite(red, r, a, bg_red); |
---|
757 | alpha_composite(green, g, a, bg_green); |
---|
758 | alpha_composite(blue, b, a, bg_blue); |
---|
759 | } |
---|
760 | pixel = (red << RShift) | |
---|
761 | (green << GShift) | |
---|
762 | (blue << BShift); |
---|
763 | /* recall that we set ximage->byte_order = MSBFirst above */ |
---|
764 | *dest++ = (char)((pixel >> 24) & 0xff); |
---|
765 | *dest++ = (char)((pixel >> 16) & 0xff); |
---|
766 | *dest++ = (char)((pixel >> 8) & 0xff); |
---|
767 | *dest++ = (char)( pixel & 0xff); |
---|
768 | } |
---|
769 | } |
---|
770 | /* display after every 16 lines */ |
---|
771 | if (((row+1) & 0xf) == 0) { |
---|
772 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, |
---|
773 | (int)lastrow, image_width, 16); |
---|
774 | XFlush(display); |
---|
775 | lastrow = row + 1; |
---|
776 | } |
---|
777 | } |
---|
778 | |
---|
779 | } else if (depth == 16) { |
---|
780 | ush red, green, blue; |
---|
781 | |
---|
782 | for (lastrow = row = 0; row < image_height; ++row) { |
---|
783 | src = image_data + row*image_rowbytes; |
---|
784 | dest = ximage->data + row*ximage_rowbytes; |
---|
785 | if (image_channels == 3) { |
---|
786 | for (i = image_width; i > 0; --i) { |
---|
787 | red = ((ush)(*src) << 8); |
---|
788 | ++src; |
---|
789 | green = ((ush)(*src) << 8); |
---|
790 | ++src; |
---|
791 | blue = ((ush)(*src) << 8); |
---|
792 | ++src; |
---|
793 | pixel = ((red >> RShift) & RMask) | |
---|
794 | ((green >> GShift) & GMask) | |
---|
795 | ((blue >> BShift) & BMask); |
---|
796 | /* recall that we set ximage->byte_order = MSBFirst above */ |
---|
797 | *dest++ = (char)((pixel >> 8) & 0xff); |
---|
798 | *dest++ = (char)( pixel & 0xff); |
---|
799 | } |
---|
800 | } else /* if (image_channels == 4) */ { |
---|
801 | for (i = image_width; i > 0; --i) { |
---|
802 | r = *src++; |
---|
803 | g = *src++; |
---|
804 | b = *src++; |
---|
805 | a = *src++; |
---|
806 | if (a == 255) { |
---|
807 | red = ((ush)r << 8); |
---|
808 | green = ((ush)g << 8); |
---|
809 | blue = ((ush)b << 8); |
---|
810 | } else if (a == 0) { |
---|
811 | red = ((ush)bg_red << 8); |
---|
812 | green = ((ush)bg_green << 8); |
---|
813 | blue = ((ush)bg_blue << 8); |
---|
814 | } else { |
---|
815 | /* this macro (from png.h) composites the foreground |
---|
816 | * and background values and puts the result back into |
---|
817 | * the first argument (== fg byte here: safe) */ |
---|
818 | alpha_composite(r, r, a, bg_red); |
---|
819 | alpha_composite(g, g, a, bg_green); |
---|
820 | alpha_composite(b, b, a, bg_blue); |
---|
821 | red = ((ush)r << 8); |
---|
822 | green = ((ush)g << 8); |
---|
823 | blue = ((ush)b << 8); |
---|
824 | } |
---|
825 | pixel = ((red >> RShift) & RMask) | |
---|
826 | ((green >> GShift) & GMask) | |
---|
827 | ((blue >> BShift) & BMask); |
---|
828 | /* recall that we set ximage->byte_order = MSBFirst above */ |
---|
829 | *dest++ = (char)((pixel >> 8) & 0xff); |
---|
830 | *dest++ = (char)( pixel & 0xff); |
---|
831 | } |
---|
832 | } |
---|
833 | /* display after every 16 lines */ |
---|
834 | if (((row+1) & 0xf) == 0) { |
---|
835 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, |
---|
836 | (int)lastrow, image_width, 16); |
---|
837 | XFlush(display); |
---|
838 | lastrow = row + 1; |
---|
839 | } |
---|
840 | } |
---|
841 | |
---|
842 | } else /* depth == 8 */ { |
---|
843 | |
---|
844 | /* GRR: add 8-bit support */ |
---|
845 | |
---|
846 | } |
---|
847 | |
---|
848 | Trace((stderr, "calling final XPutImage()\n")) |
---|
849 | if (lastrow < image_height) { |
---|
850 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, |
---|
851 | (int)lastrow, image_width, image_height-lastrow); |
---|
852 | XFlush(display); |
---|
853 | } |
---|
854 | |
---|
855 | return 0; |
---|
856 | } |
---|
857 | |
---|
858 | |
---|
859 | |
---|
860 | |
---|
861 | static void rpng_x_cleanup(void) |
---|
862 | { |
---|
863 | if (image_data) { |
---|
864 | free(image_data); |
---|
865 | image_data = NULL; |
---|
866 | } |
---|
867 | |
---|
868 | if (ximage) { |
---|
869 | if (ximage->data) { |
---|
870 | free(ximage->data); /* we allocated it, so we free it */ |
---|
871 | ximage->data = (char *)NULL; /* instead of XDestroyImage() */ |
---|
872 | } |
---|
873 | XDestroyImage(ximage); |
---|
874 | ximage = NULL; |
---|
875 | } |
---|
876 | |
---|
877 | if (have_gc) |
---|
878 | XFreeGC(display, gc); |
---|
879 | |
---|
880 | if (have_window) |
---|
881 | XDestroyWindow(display, window); |
---|
882 | |
---|
883 | if (have_colormap) |
---|
884 | XFreeColormap(display, colormap); |
---|
885 | |
---|
886 | if (have_nondefault_visual) |
---|
887 | XFree(visual_list); |
---|
888 | } |
---|
889 | |
---|
890 | |
---|
891 | |
---|
892 | |
---|
893 | |
---|
894 | static int rpng_x_msb(ulg u32val) |
---|
895 | { |
---|
896 | int i; |
---|
897 | |
---|
898 | for (i = 31; i >= 0; --i) { |
---|
899 | if (u32val & 0x80000000L) |
---|
900 | break; |
---|
901 | u32val <<= 1; |
---|
902 | } |
---|
903 | return i; |
---|
904 | } |
---|