1 | #! perl |
1 | #! perl |
2 | |
2 | |
3 | #:META:X_RESOURCE:%.expr:string:background expression |
3 | #:META:X_RESOURCE:%.expr:string:background expression |
4 | #:META:X_RESOURCE:%.border.:boolean:respect the terminal border |
4 | #:META:X_RESOURCE:%.border.:boolean:respect the terminal border |
5 | |
5 | |
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6 | #TODO: once, rootalign |
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7 | |
6 | =head1 background - manage terminal background |
8 | =head1 background - manage terminal background |
7 | |
9 | |
8 | =head2 SYNOPSIS |
10 | =head2 SYNOPSIS |
9 | |
11 | |
10 | rxvt -background-expr 'background expression' |
12 | urxvt --background-expr 'background expression' |
11 | -background-border |
13 | --background-border |
12 | |
14 | |
13 | =head2 DESCRIPTION |
15 | =head2 DESCRIPTION |
14 | |
16 | |
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17 | This extension manages the terminal background by creating a picture that |
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18 | is behind the text, replacing the normal background colour. |
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19 | |
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20 | It does so by evaluating a Perl expression that I<calculates> the image on |
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21 | the fly, for example, by grabbing the root background or loading a file. |
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22 | |
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23 | While the full power of Perl is available, the operators have been design |
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24 | to be as simple as possible. |
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25 | |
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26 | For example, to load an image and scale it to the window size, you would |
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27 | use: |
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28 | |
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29 | urxvt --background-expr 'scale load "/path/to/mybg.png"' |
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30 | |
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31 | Or specified as a X resource: |
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32 | |
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33 | URxvt.background-expr: scale load "/path/to/mybg.png" |
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34 | |
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35 | =head2 THEORY OF OPERATION |
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36 | |
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37 | At startup, just before the window is mapped for the first time, the |
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38 | expression is evaluated and must yield an image. The image is then |
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39 | extended as necessary to cover the whole terminal window, and is set as a |
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40 | background pixmap. |
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41 | |
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42 | If the image contains an alpha channel, then it will be used as-is in |
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43 | visuals that support alpha channels (for example, for a compositing |
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44 | manager). In other visuals, the terminal background colour will be used to |
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45 | replace any transparency. |
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46 | |
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47 | When the expression relies, directly or indirectly, on the window size, |
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48 | position, the root pixmap, or a timer, then it will be remembered. If not, |
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49 | then it will be removed. |
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50 | |
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51 | If any of the parameters that the expression relies on changes (when the |
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52 | window is moved or resized, its position or size changes; when the root |
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53 | pixmap is replaced by another one the root background changes; or when the |
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54 | timer elapses), then the expression will be evaluated again. |
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55 | |
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56 | For example, an expression such as C<scale load "$HOME/mybg.png"> scales the |
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57 | image to the window size, so it relies on the window size and will |
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58 | be reevaluated each time it is changed, but not when it moves for |
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59 | example. That ensures that the picture always fills the terminal, even |
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60 | after it's size changes. |
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61 | |
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62 | =head3 EXPRESSIONS |
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63 | |
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64 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
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65 | which means you could use multiple lines and statements: |
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66 | |
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67 | again 3600; |
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68 | if (localtime now)[6]) { |
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69 | return scale load "$HOME/weekday.png"; |
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70 | } else { |
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71 | return scale load "$HOME/sunday.png"; |
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72 | } |
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73 | |
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74 | This expression gets evaluated once per hour. It will set F<sunday.png> as |
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75 | background on Sundays, and F<weekday.png> on all other days. |
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76 | |
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77 | Fortunately, we expect that most expressions will be much simpler, with |
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78 | little Perl knowledge needed. |
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79 | |
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80 | Basically, you always start with a function that "generates" an image |
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81 | object, such as C<load>, which loads an image from disk, or C<root>, which |
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82 | returns the root window background image: |
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83 | |
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84 | load "$HOME/mypic.png" |
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85 | |
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86 | The path is usually specified as a quoted string (the exact rules can be |
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87 | found in the L<perlop> manpage). The F<$HOME> at the beginning of the |
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88 | string is expanded to the home directory. |
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89 | |
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90 | Then you prepend one or more modifiers or filtering expressions, such as |
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91 | C<scale>: |
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92 | |
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93 | scale load "$HOME/mypic.png" |
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94 | |
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95 | Just like a mathematical expression with functions, you should read these |
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96 | expressions from right to left, as the C<load> is evaluated first, and |
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97 | its result becomes the argument to the C<scale> function. |
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98 | |
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99 | Many operators also allow some parameters preceding the input image |
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100 | that modify its behaviour. For example, C<scale> without any additional |
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101 | arguments scales the image to size of the terminal window. If you specify |
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102 | an additional argument, it uses it as a percentage: |
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103 | |
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104 | scale 200, load "$HOME/mypic.png" |
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105 | |
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106 | This enlarges the image by a factor of 2 (200%). As you can see, C<scale> |
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107 | has now two arguments, the C<200> and the C<load> expression, while |
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108 | C<load> only has one argument. Arguments are separated from each other by |
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109 | commas. |
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110 | |
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111 | Scale also accepts two arguments, which are then separate factors for both |
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112 | horizontal and vertical dimensions. For example, this halves the image |
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113 | width and doubles the image height: |
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114 | |
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115 | scale 50, 200, load "$HOME/mypic.png" |
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116 | |
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117 | Other effects than scalign are also readily available, for exmaple, you can |
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118 | tile the image to fill the whole window, instead of resizing it: |
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119 | |
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120 | tile load "$HOME/mypic.png" |
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121 | |
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122 | In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator |
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123 | is kind of superfluous. |
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124 | |
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125 | Another common effect is to mirror the image, so that the same edges touch: |
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126 | |
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127 | mirror load "$HOME/mypic.png" |
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128 | |
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129 | This is also a typical background expression: |
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130 | |
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131 | rootalign root |
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132 | |
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133 | It first takes a snapshot of the screen background image, and then |
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134 | moves it to the upper left corner of the screen - the result is |
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135 | pseudo-transparency, as the image seems to be static while the window is |
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136 | moved around. |
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137 | |
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138 | =head3 CYCLES AND CACHING |
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139 | |
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140 | As has been mentioned before, the expression might be evaluated multiple |
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141 | times. Each time the expression is reevaluated, a new cycle is said to |
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142 | have begun. Many operators cache their results till the next cycle. |
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143 | |
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144 | For example, the C<load> operator keeps a copy of the image. If it is |
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145 | asked to load the same image on the next cycle it will not load it again, |
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146 | but return the cached copy. |
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147 | |
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148 | This only works for one cycle though, so as long as you load the same |
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149 | image every time, it will always be cached, but when you load a different |
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150 | image, it will forget about the first one. |
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151 | |
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152 | This allows you to either speed things up by keeping multiple images in |
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153 | memory, or comserve memory by loading images more often. |
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154 | |
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155 | For example, you can keep two images in memory and use a random one like |
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156 | this: |
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157 | |
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158 | my $img1 = load "img1.png"; |
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159 | my $img2 = load "img2.png"; |
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160 | (0.5 > rand) ? $img1 : $img2 |
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161 | |
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162 | Since both images are "loaded" every time the expression is evaluated, |
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163 | they are always kept in memory. Contrast this version: |
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164 | |
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165 | my $path1 = "img1.png"; |
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166 | my $path2 = "img2.png"; |
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167 | load ((0.5 > rand) ? $path1 : $path2) |
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168 | |
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169 | Here, a path is selected randomly, and load is only called for one image, |
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170 | so keeps only one image in memory. If, on the next evaluation, luck |
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171 | decides to use the other path, then it will have to load that image again. |
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172 | |
15 | =head2 REFERENCE |
173 | =head2 REFERENCE |
16 | |
174 | |
17 | =cut |
175 | =head3 COMMAND LINE SWITCHES |
18 | |
176 | |
19 | our $EXPR; |
177 | =over 4 |
20 | #$EXPR = 'move W * 0.1, -H * 0.1, resize W * 0.5, H * 0.5, repeat_none load "opensource.png"'; |
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21 | $EXPR = 'move -TX, -TY, load "argb.png"'; |
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22 | #$EXPR = ' |
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23 | # rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
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24 | # clip X, Y, W, H, repeat_mirror, |
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25 | # load "/root/pix/das_fette_schwein.jpg" |
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26 | #'; |
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27 | #$EXPR = 'solid "red"'; |
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28 | #$EXPR = 'blur root, 10, 10' |
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29 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
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30 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
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31 | |
178 | |
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179 | =item --background-expr perl-expression |
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180 | |
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181 | Specifies the Perl expression to evaluate. |
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182 | |
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183 | =item --background-border |
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184 | |
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185 | By default, the expression creates an image that fills the full window, |
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186 | overwriting borders and any other areas, such as the scrollbar. |
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187 | |
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188 | Specifying this flag changes the behaviour, so that the image only |
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189 | replaces the background of the character area. |
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190 | |
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191 | =back |
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192 | |
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193 | =cut |
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194 | |
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195 | our $HOME; |
32 | our ($self, $old, $new); |
196 | our ($self, $old, $new); |
33 | our ($x, $y, $w, $h); |
197 | our ($x, $y, $w, $h); |
34 | |
198 | |
35 | # enforce at least this interval between updates |
199 | # enforce at least this interval between updates |
36 | our $MIN_INTERVAL = 1/100; |
200 | our $MIN_INTERVAL = 1/100; |
… | |
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158 | |
322 | |
159 | When this function is used the expression will be reevaluated again in |
323 | When this function is used the expression will be reevaluated again in |
160 | C<$seconds> seconds. |
324 | C<$seconds> seconds. |
161 | |
325 | |
162 | Example: load some image and rotate it according to the time of day (as if it were |
326 | Example: load some image and rotate it according to the time of day (as if it were |
163 | the hour pointer of a clock). update this image every minute. |
327 | the hour pointer of a clock). Update this image every minute. |
164 | |
328 | |
165 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
329 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
166 | |
330 | |
167 | =item counter $seconds |
331 | =item counter $seconds |
168 | |
332 | |
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193 | |
357 | |
194 | =item tile $img |
358 | =item tile $img |
195 | |
359 | |
196 | Tiles the whole plane with the image and returns this new image - or in |
360 | Tiles the whole plane with the image and returns this new image - or in |
197 | other words, it returns a copy of the image in plane tiling mode. |
361 | other words, it returns a copy of the image in plane tiling mode. |
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362 | |
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363 | Example: load an image and tile it over the background, without |
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364 | resizing. The C<tile> call is superfluous because C<load> already defaults |
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365 | to tiling mode. |
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366 | |
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367 | tile load "mybg.png" |
198 | |
368 | |
199 | =item mirror $img |
369 | =item mirror $img |
200 | |
370 | |
201 | Similar to tile, but reflects the image each time it uses a new copy, so |
371 | Similar to tile, but reflects the image each time it uses a new copy, so |
202 | that top edges always touch top edges, right edges always touch right |
372 | that top edges always touch top edges, right edges always touch right |
203 | edges and so on (with normal tiling, left edges always touch right edges |
373 | edges and so on (with normal tiling, left edges always touch right edges |
204 | and top always touch bottom edges). |
374 | and top always touch bottom edges). |
205 | |
375 | |
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376 | Example: load an image and mirror it over the background, avoiding sharp |
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377 | edges at the image borders at the expense of mirroring the image itself |
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378 | |
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379 | mirror load "mybg.png" |
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380 | |
206 | =item pad $img |
381 | =item pad $img |
207 | |
382 | |
208 | Takes an image and modifies it so that all pixels outside the image area |
383 | Takes an image and modifies it so that all pixels outside the image area |
209 | become transparent. This mode is most useful when you want to place an |
384 | become transparent. This mode is most useful when you want to place an |
210 | image over another image or the background colour while leaving all |
385 | image over another image or the background colour while leaving all |
211 | background pixels outside the image unchanged. |
386 | background pixels outside the image unchanged. |
212 | |
387 | |
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388 | Example: load an image and display it in the upper left corner. The rest |
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389 | of the space is left "empty" (transparent or wahtever your compisotr does |
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390 | in alpha mode, else background colour). |
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391 | |
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392 | pad load "mybg.png" |
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393 | |
213 | =item extend $img |
394 | =item extend $img |
214 | |
395 | |
215 | Extends the image over the whole plane, using the closest pixel in the |
396 | Extends the image over the whole plane, using the closest pixel in the |
216 | area outside the image. This mode is mostly useful when you more complex |
397 | area outside the image. This mode is mostly useful when you more complex |
217 | filtering operations and want the pixels outside the image to have the |
398 | filtering operations and want the pixels outside the image to have the |
218 | same values as the pixels near the edge. |
399 | same values as the pixels near the edge. |
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400 | |
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401 | Example: just for curiosity, how does this pixel extension stuff work? |
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402 | |
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403 | extend move 50, 50, load "mybg.png" |
219 | |
404 | |
220 | =cut |
405 | =cut |
221 | |
406 | |
222 | sub pad($) { |
407 | sub pad($) { |
223 | my $img = $_[0]->clone; |
408 | my $img = $_[0]->clone; |
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324 | sub resize($$$) { |
509 | sub resize($$$) { |
325 | my $img = pop; |
510 | my $img = pop; |
326 | $img->scale ($_[0], $_[1]) |
511 | $img->scale ($_[0], $_[1]) |
327 | } |
512 | } |
328 | |
513 | |
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514 | =item move $dx, $dy, $img |
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515 | |
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516 | Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in |
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517 | the vertical. |
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518 | |
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519 | Example: move the image right by 20 pixels and down by 30. |
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520 | |
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521 | move 20, 30, ... |
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522 | |
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523 | =item rootalign $img |
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524 | |
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525 | Moves the image so that it appears glued to the screen as opposed to the |
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526 | window. This gives the illusion of a larger area behind the window. It is |
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527 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
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528 | top left of the screen. |
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529 | |
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530 | Example: load a background image, put it in mirror mode and root align it. |
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531 | |
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532 | rootalign mirror load "mybg.png" |
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533 | |
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534 | Example: take the screen background and align it, giving the illusion of |
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535 | transparency as long as the window isn't in front of other windows. |
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536 | |
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537 | rootalign root |
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538 | |
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539 | =cut |
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540 | |
329 | sub move($$;$) { |
541 | sub move($$;$) { |
330 | my $img = pop->clone; |
542 | my $img = pop->clone; |
331 | $img->move ($_[0], $_[1]); |
543 | $img->move ($_[0], $_[1]); |
332 | $img |
544 | $img |
333 | } |
545 | } |
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546 | |
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547 | sub rootalign($) { |
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548 | move -TX, -TY, $_[0] |
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549 | } |
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550 | |
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551 | =item contrast $factor, $img |
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552 | |
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553 | =item contrast $r, $g, $b, $img |
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554 | |
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555 | =item contrast $r, $g, $b, $a, $img |
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556 | |
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557 | Adjusts the I<contrast> of an image. |
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558 | |
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559 | #TODO# |
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560 | |
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561 | =item brightness $factor, $img |
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562 | |
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563 | =item brightness $r, $g, $b, $img |
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564 | |
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565 | =item brightness $r, $g, $b, $a, $img |
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566 | |
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567 | Adjusts the brightness of an image. |
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568 | |
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569 | =cut |
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570 | |
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571 | sub contrast($$;$$;$) { |
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572 | my $img = pop; |
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573 | my ($r, $g, $b, $a) = @_; |
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574 | |
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575 | ($g, $b) = ($r, $r) if @_ < 4; |
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576 | $a = 1 if @_ < 5; |
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577 | |
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578 | $img = $img->clone; |
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579 | $img->contrast ($r, $g, $b, $a); |
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580 | $img |
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581 | } |
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582 | |
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583 | sub brightness($$;$$;$) { |
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584 | my $img = pop; |
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585 | my ($r, $g, $b, $a) = @_; |
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586 | |
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587 | ($g, $b) = ($r, $r) if @_ < 4; |
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588 | $a = 1 if @_ < 5; |
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589 | |
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590 | $img = $img->clone; |
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591 | $img->brightness ($r, $g, $b, $a); |
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592 | $img |
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593 | } |
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594 | |
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595 | =item blur $radius, $img |
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596 | |
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597 | =item blur $radius_horz, $radius_vert, $img |
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598 | |
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599 | Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii |
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600 | can also be specified separately. |
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601 | |
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602 | Blurring is often I<very> slow, at least compared or other |
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603 | operators. Larger blur radii are slower than smaller ones, too, so if you |
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604 | don't want to freeze your screen for long times, start experimenting with |
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605 | low values for radius (<5). |
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606 | |
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607 | =cut |
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608 | |
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609 | sub blur($$;$) { |
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610 | my $img = pop; |
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611 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
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612 | } |
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613 | |
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614 | =item rotate $new_width, $new_height, $center_x, $center_y, $degrees |
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615 | |
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616 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
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617 | pointer at C<$center_x> and C<$center_y> (specified as percentage of image |
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618 | width/height), generating a new image with width C<$new_width> and height |
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619 | C<$new_height>. |
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620 | |
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621 | #TODO# new width, height, maybe more operators? |
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622 | |
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623 | Example: rotate the image by 90 degrees |
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624 | |
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625 | =cut |
334 | |
626 | |
335 | sub rotate($$$$$$) { |
627 | sub rotate($$$$$$) { |
336 | my $img = pop; |
628 | my $img = pop; |
337 | $img->rotate ( |
629 | $img->rotate ( |
338 | $_[0], |
630 | $_[0], |
… | |
… | |
341 | $_[3] * $img->h * .01, |
633 | $_[3] * $img->h * .01, |
342 | $_[4] * (3.14159265 / 180), |
634 | $_[4] * (3.14159265 / 180), |
343 | ) |
635 | ) |
344 | } |
636 | } |
345 | |
637 | |
346 | sub blur($$;$) { |
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347 | my $img = pop; |
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348 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
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349 | } |
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350 | |
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351 | sub contrast($$;$$;$) { |
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352 | my $img = pop; |
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353 | my ($r, $g, $b, $a) = @_; |
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354 | |
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|
355 | ($g, $b) = ($r, $r) if @_ < 4; |
|
|
356 | $a = 1 if @_ < 5; |
|
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357 | |
|
|
358 | $img = $img->clone; |
|
|
359 | $img->contrast ($r, $g, $b, $a); |
|
|
360 | $img |
|
|
361 | } |
|
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362 | |
|
|
363 | sub brightness($$;$$;$) { |
|
|
364 | my $img = pop; |
|
|
365 | my ($r, $g, $b, $a) = @_; |
|
|
366 | |
|
|
367 | ($g, $b) = ($r, $r) if @_ < 4; |
|
|
368 | $a = 1 if @_ < 5; |
|
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369 | |
|
|
370 | $img = $img->clone; |
|
|
371 | $img->brightness ($r, $g, $b, $a); |
|
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372 | $img |
|
|
373 | } |
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|
374 | |
|
|
375 | =back |
638 | =back |
376 | |
639 | |
377 | =cut |
640 | =cut |
378 | |
641 | |
379 | } |
642 | } |
… | |
… | |
409 | |
672 | |
410 | # set environment to evaluate user expression |
673 | # set environment to evaluate user expression |
411 | |
674 | |
412 | local $self = $arg_self; |
675 | local $self = $arg_self; |
413 | |
676 | |
|
|
677 | local $HOME = $ENV{HOME}; |
414 | local $old = $self->{state}; |
678 | local $old = $self->{state}; |
415 | local $new = my $state = $self->{state} = {}; |
679 | local $new = my $state = $self->{state} = {}; |
416 | |
680 | |
417 | ($x, $y, $w, $h) = |
681 | ($x, $y, $w, $h) = |
418 | $self->background_geometry ($self->{border}); |
682 | $self->background_geometry ($self->{border}); |
… | |
… | |
421 | |
685 | |
422 | my $img = eval { $self->{expr}->() }; |
686 | my $img = eval { $self->{expr}->() }; |
423 | warn $@ if $@;#d# |
687 | warn $@ if $@;#d# |
424 | die if !UNIVERSAL::isa $img, "urxvt::img"; |
688 | die if !UNIVERSAL::isa $img, "urxvt::img"; |
425 | |
689 | |
|
|
690 | $state->{size_sensitive} = 1 |
|
|
691 | if $img->repeat_mode != urxvt::RepeatNormal; |
|
|
692 | |
426 | # if the expression is sensitive to external events, prepare reevaluation then |
693 | # if the expression is sensitive to external events, prepare reevaluation then |
427 | |
694 | |
428 | my $repeat; |
695 | my $repeat; |
429 | |
696 | |
430 | if (my $again = $state->{again}) { |
697 | if (my $again = $state->{again}) { |
431 | $repeat = 1; |
698 | $repeat = 1; |
|
|
699 | my $self = $self; |
432 | $state->{timer} = $again == $old->{again} |
700 | $state->{timer} = $again == $old->{again} |
433 | ? $old->{timer} |
701 | ? $old->{timer} |
434 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
702 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
435 | ++$self->{counter}; |
703 | ++$self->{counter}; |
436 | $self->recalculate |
704 | $self->recalculate |
… | |
… | |
465 | unless ($repeat) { |
733 | unless ($repeat) { |
466 | delete $self->{state}; |
734 | delete $self->{state}; |
467 | delete $self->{expr}; |
735 | delete $self->{expr}; |
468 | } |
736 | } |
469 | |
737 | |
470 | # prepare and set background pixmap |
738 | # set background pixmap |
471 | |
|
|
472 | $img = $img->sub_rect (0, 0, $w, $h) |
|
|
473 | if $img->w != $w || $img->h != $h; |
|
|
474 | |
739 | |
475 | $self->set_background ($img, $self->{border}); |
740 | $self->set_background ($img, $self->{border}); |
476 | $self->scr_recolour (0); |
741 | $self->scr_recolour (0); |
477 | $self->want_refresh; |
742 | $self->want_refresh; |
478 | } |
743 | } |