1 | NAME |
1 | NAME |
2 | cv - a fast gtk+ image viewer modeled after xv |
2 | cv - a fast gtk+ image viewer loosely modeled after XV |
3 | |
3 | |
4 | SYNOPSIS |
4 | SYNOPSIS |
5 | cv [file...] |
5 | cv [file...] |
6 | |
6 | |
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7 | FEATURES |
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8 | CV is supposed to work similar to the venerable XV image viewer, just |
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9 | faster. Why faster? |
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10 | |
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11 | * optimized directory scanning algorithm |
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12 | The directory scanning in CV uses some tricks that - on most modern |
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13 | filesystems - makes it possible to detect filetypes faster than |
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14 | stat()'ing every file. This makes CV suitable for directories with |
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15 | lots of files (10000+). |
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16 | |
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17 | This algorithm is quite unprecise - it doesn't make a difference |
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18 | between files, device nodes, symlinks and the like, and filetype |
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19 | detection is done using the file extension only. |
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20 | |
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21 | On the positive side, it is usually many orders of magnitude faster |
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22 | than traditional scanning techniques (good for directories with |
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23 | 10000 or 100000+ files). |
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24 | |
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25 | * queuing for all time-consuming background tasks |
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26 | All tasks, such as unlinking files or generating thumbnails, that |
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27 | can be done in the background will be done so - no waiting required, |
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28 | even when changing directories. |
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29 | |
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30 | * use of asynchronous I/O |
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31 | CV tries to use asynchronous I/O whereever it makes sense, for |
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32 | example while scanning directories, waiting for stat data, unlinking |
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33 | files or generating thumbnails. This usually decreases scanning |
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34 | times for large directories a bit (especially on RAID devices and |
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35 | over NFS) and makes CV much more interactive. |
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36 | |
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37 | * fast image loading |
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38 | The time span between the user issuing a command and displaying the |
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39 | new image should be as small as possible. CV uses optimized |
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40 | (especially for JPEG) loading functions and sacrifices some quality |
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41 | (e.g no gamma correction, although this might change) to achieve |
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42 | this speed. |
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43 | |
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44 | * fast thumbnail creation |
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45 | Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, |
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46 | so on modern CPUs, thumbnailing is usually limited by I/O speed. |
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47 | Thumbnail creation for JPEGs has been specially optimized and can |
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48 | even take advantage of multiple CPUs. |
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49 | |
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50 | * minimum optical clutter |
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51 | CV has no menus or other user interface elements that take up a lot |
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52 | of screen space (or are useful for beginning users). The schnauzer |
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53 | windows can also be somewhat crowded. |
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54 | |
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55 | The point of an image viewer is viewing images, not a nice GUI. This |
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56 | is similar to XV's behaviour. |
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57 | |
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58 | * efficient (and hard to learn) user interface |
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59 | CV uses key combinations. A lot. If you are an experienced XV user, |
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60 | you will find most of these keys familiar. If not, CV might be hard |
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61 | to use at first, but will be an efficient tool later. |
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62 | |
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63 | * multi-window GUI |
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64 | CV doesn't force you to use a specific layout, instead it relies on |
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65 | your window manager, thus enabling you to chose whatever layout that |
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66 | suits you most. |
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67 | |
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68 | * i18n'ed filename handling throughout |
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69 | As long as glib can recognize your filename encoding (either UTF-8 |
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70 | or locale-specific, depending on the setting of G_BROKEN_FILENAMES) |
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71 | and you have the relevant fonts, CV will display your filenames |
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72 | correctly. |
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73 | |
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74 | * extensible through plug-ins |
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75 | I have weird plug-ins that access remote databases to find a |
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76 | directory. This is not likely to be of any use to other people. |
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77 | Likewise, others might have weird requirements I cannot dream of. |
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78 | |
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79 | * filename clustering |
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80 | Among the standard plug-ins is a filename clustering plug-in, that |
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81 | (in case of tens of thousands images in one directory) might be able |
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82 | to cluster similar names together. |
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83 | |
7 | DESCRIPTION |
84 | DESCRIPTION |
8 | None yet. |
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9 | |
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10 | THE IMAGE WINDOW |
85 | THE IMAGE WINDOW |
11 | You can use the following keys in the image window: |
86 | You can use the following keys in the image window: |
12 | |
87 | |
13 | q quit the program |
88 | q quit the program |
14 | < half the image size |
89 | < half the image size |
15 | > double the image size |
90 | > double the image size |
16 | , shrink the image by 10% |
91 | , shrink the image by 10% |
17 | . enlarge the image by 10% |
92 | . enlarge the image by 10% |
18 | n reset to normal size |
93 | n reset to normal size |
19 | m maximize to screensize |
94 | m maximize to screensize |
20 | M maxime to screensize, respecting image aspect |
95 | M maximize to screensize, respecting image aspect |
21 | ctrl-m toggle maxpect-always mode |
96 | ctrl-m toggle maxpect-always mode |
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97 | ctrl-sift-m toggle using current image size as max image size |
22 | u uncrop |
98 | u uncrop |
23 | r set scaling mode to 'nearest' (fastest) |
99 | r set scaling mode to 'nearest' (fastest) |
24 | s set scaling mode to 'bilinear' (default) |
100 | s set scaling mode to 'bilinear' (default) |
25 | S set scaling mode to 'hyper' (slowest) |
101 | shift-s set scaling mode to 'hyper' (slowest) |
26 | t rotate clockwise 90° |
102 | t rotate clockwise 90° |
27 | T rotate counterclockwise° |
103 | T rotate counterclockwise° |
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104 | a apply all rotations loslessly to a jpeg file (using exiftran) |
28 | ctrl-v open a new visual schnauzer window for the current dir |
105 | ctrl-v open a new visual schnauzer window for the current dir |
29 | ctrl-s rescan visual schnauzer files for updates/deletes etc. |
106 | ctrl-c clone the current image window |
30 | ctrl-e run an editor ($CV_EDITOR or "gimp") on the current image. |
107 | ctrl-e run an editor ($CV_EDITOR or "gimp") on the current image |
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108 | ctrl-p fire up the print dialog |
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109 | escape cancel a crop action |
31 | |
110 | |
32 | The following keys are redirected to the default visual schnauzer |
111 | And when playing movies, these additional keys are active: |
33 | window: |
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34 | |
112 | |
35 | space next image |
113 | left rewind by 10 seconds |
36 | backspace last image |
114 | right forward by 10 seconds |
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115 | down rewind by 60 seconds |
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116 | up forward by 60 seconds |
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117 | pg_up rewind by 600 seconds |
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118 | pg_down forward by 600 seconds |
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119 | o toggle on-screen display |
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120 | p pause/unpause |
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121 | escape stop playing |
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122 | 9 turn volume down |
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123 | 0 turn volume up |
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124 | |
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125 | Any other keys will be sent to the default schnauzer window, which can |
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126 | be toggled on and off by right-clicking into the image window. |
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127 | |
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128 | Left-clicking into the image window will let you crop the image (usually |
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129 | to zoom into large images that CV scales down). |
37 | |
130 | |
38 | THE VISUAL SCHNAUZER |
131 | THE VISUAL SCHNAUZER |
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132 | Any image-loading action in a schnauzer window acts on the |
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133 | "last-recently-activated" imagewindow, which currently is simply the |
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134 | last image window that received a keypress. |
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135 | |
39 | You can use the following keys in the schnauzer window: |
136 | You can use the following keys in the schnauzer window: |
40 | |
137 | |
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138 | ctrl-space, |
41 | space move to and display next image |
139 | space move to and display next image |
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140 | ctrl-backspace, |
42 | backspace move to and display previous image |
141 | backspace move to and display previous image |
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142 | ctrl-return, |
43 | return display selected picture |
143 | return display selected picture, or enter directory |
44 | |
144 | |
45 | cursor keys move selection |
145 | cursor keys move selection |
46 | page-up move one page up |
146 | page-up move one page up |
47 | page-down move one page down |
147 | page-down move one page down |
48 | home move to first file |
148 | home move to first file |
49 | end move to last file |
149 | end move to last file |
50 | |
150 | |
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151 | ctrl-a select all files |
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152 | ctrl-shift-a select all files currently displayed in the schnauzer window |
51 | ctrl-d delete selected files WITHOUT ASKING AGAIN |
153 | ctrl-d delete selected files WITHOUT ASKING AGAIN |
52 | ctrl-g generate icons for the selected files |
154 | ctrl-g force generation of thumbnais for the selected files |
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155 | ctrl-s rescan current direcory or files updates/deletes etc. |
53 | ctrl-u update selected (or all) icons if neccessary |
156 | ctrl-u update selected (or all) icons if neccessary |
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157 | ctrl-l don't use, will become a plug-in eventually |
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158 | |
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159 | ^ go to parent directory (caret). |
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160 | |
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161 | 0-9, |
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162 | a-z find the first filename beginning with this letter |
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163 | |
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164 | Right-clicking into the schnauzer window displays a pop-up menu with |
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165 | additional actions. |
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166 | |
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167 | SELECTION |
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168 | You can select entries in the Schnauzer in a variety of ways: |
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169 | |
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170 | Keyboard |
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171 | Moving the cursor with the keyboard will first deselect all files |
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172 | and then select the file you moved to. |
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173 | |
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174 | Clicking |
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175 | Clicking on an entry will select the one you clicked and deselect |
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176 | all others. |
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177 | |
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178 | Shift-Clicking |
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179 | Shift-clicking will toggle the selection on the entry under the |
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180 | mouse. |
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181 | |
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182 | Dragging |
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183 | Dragging will select all entries between the one selected when |
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184 | pushing the button and the one selected when releasing the button. |
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185 | If you move above or below the schnauzer area while drag-selecting, |
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186 | the schnauzer will move up/down one row twice per second. In |
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187 | addition, horizontal mouse movement acts as a kind of invisible |
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188 | horizontal scrollbar. |
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189 | |
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190 | Hint: double-click works while click-selecting |
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191 | You can double-click any image while click-selecting to display it |
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192 | without stopping the selection process. This will act as if you |
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193 | normally double-clicked the image to display it, and will toggle the |
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194 | selection twice, resulting in no change. |
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195 | |
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196 | FILES |
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197 | When starting, CV runs the .cvrc file in your $HOME directory as if it |
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198 | were a perl script. in that, you will mostly load plug-ins. |
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199 | |
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200 | Example: |
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201 | |
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202 | system "fping -q -t 10 ether" |
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203 | or require "/fs/cv/cvplugin.pl"; |
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204 | |
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205 | This will load a plug-in, but only if the machine *ether* is reachable |
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206 | (supposedly the plug-in is networked in some way :). |
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207 | |
55 | ENVIRONMENT |
208 | ENVIRONMENT |
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209 | CV_EDITOR |
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210 | The program that gets executed when the user presses "CTRL-e" in the |
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211 | Schnauzer or image window. The default is "gimp". |
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212 | |
56 | CV_PRINT_DESTINATION |
213 | CV_PRINT_DESTINATION |
57 | The default (perl-style) destination to use in the print dialog. |
214 | The default (perl-style) destination to use in the print dialog. |
58 | |
215 | |
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216 | CV_TRASHCAN |
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217 | When set, must point to a directory where all files that are deleted |
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218 | are moved to. If unset, files that are deleted are really being |
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219 | deleted. |
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220 | |
59 | SECURITY CONSIDERATIONS |
221 | SECURITY CONSIDERATIONS |
60 | CV uses Pixbuf to load images. Pixbuf is not considered safe for this |
222 | CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe |
61 | purpose, though (from the gtk-2.2 release notes): |
223 | for this purpose, though (from the gtk-2.2 release notes): |
62 | |
224 | |
63 | "While efforts have been made to make gdk-pixbuf robust against invalid |
225 | "While efforts have been made to make gdk-pixbuf robust against invalid |
64 | images, using gdk-pixbuf to load untrusted data is not recommended, due |
226 | images, using gdk-pixbuf to load untrusted data is not recommended, due |
65 | to the likelyhood that there are additional problems where an invalid |
227 | to the likelyhood that there are additional problems where an invalid |
66 | image could cause gdk-pixbuf to crash or worse." |
228 | image could cause gdk-pixbuf to crash or worse." |
67 | |
229 | |
68 | BUGS/TODO |
230 | BUGS/TODO |
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231 | Lots of functionality is missing. |
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232 | |
69 | Pixbuf doesn't honor G_BROKEN_FILENAMES, so accessing files with names |
233 | Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with |
70 | incompatible with utf-8 fails. |
234 | names incompatible with utf-8 might fail. |
71 | |
235 | |
72 | rotate on disk |
236 | rotate on disk |
73 | print |
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74 | lots of ui issues |
237 | lots of ui issues |
75 | save(?) |
238 | save(?) |
76 | preferences |
239 | preferences |
77 | ctrl-u in schnauzer |
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78 | shift-cursor in schnauzer |
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79 | |
240 | |
80 | AUTHOR |
241 | AUTHOR |
81 | Marc Lehmann <cv@plan9.de>. |
242 | Marc Lehmann <cv@plan9.de>. |
82 | |
243 | |