1 | #! perl |
1 | #! perl |
2 | |
2 | |
3 | our $EXPR = 'move load "/root/pix/das_fette_schwein.jpg", repeat_wrap, X, Y'; |
3 | #:META:X_RESOURCE:%.expr:string:background expression |
4 | $EXPR = 'rotate load "/root/pix/das_fette_schwein.jpg", W, H, 50, 50, counter 1/60, repeat_mirror'; |
4 | #:META:X_RESOURCE:%.border:boolean:respect the terminal border |
5 | #$EXPR = 'blur root, 10, 10' |
5 | #:META:X_RESOURCE:%.interval:seconds:minimum time between updates |
6 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
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7 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
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8 | |
6 | |
9 | use Safe; |
7 | =head1 NAME |
10 | |
8 | |
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9 | background - manage terminal background |
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10 | |
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11 | =head1 SYNOPSIS |
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12 | |
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13 | urxvt --background-expr 'background expression' |
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14 | --background-border |
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15 | --background-interval seconds |
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16 | |
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17 | =head1 DESCRIPTION |
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18 | |
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19 | This extension manages the terminal background by creating a picture that |
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20 | is behind the text, replacing the normal background colour. |
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21 | |
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22 | It does so by evaluating a Perl expression that I<calculates> the image on |
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23 | the fly, for example, by grabbing the root background or loading a file. |
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24 | |
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25 | While the full power of Perl is available, the operators have been design |
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26 | to be as simple as possible. |
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27 | |
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28 | For example, to load an image and scale it to the window size, you would |
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29 | use: |
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30 | |
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31 | urxvt --background-expr 'scale load "/path/to/mybg.png"' |
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32 | |
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33 | Or specified as a X resource: |
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34 | |
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35 | URxvt.background-expr: scale load "/path/to/mybg.png" |
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36 | |
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37 | =head1 THEORY OF OPERATION |
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38 | |
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39 | At startup, just before the window is mapped for the first time, the |
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40 | expression is evaluated and must yield an image. The image is then |
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41 | extended as necessary to cover the whole terminal window, and is set as a |
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42 | background pixmap. |
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43 | |
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44 | If the image contains an alpha channel, then it will be used as-is in |
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45 | visuals that support alpha channels (for example, for a compositing |
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46 | manager). In other visuals, the terminal background colour will be used to |
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47 | replace any transparency. |
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48 | |
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49 | When the expression relies, directly or indirectly, on the window size, |
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50 | position, the root pixmap, or a timer, then it will be remembered. If not, |
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51 | then it will be removed. |
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52 | |
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53 | If any of the parameters that the expression relies on changes (when the |
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54 | window is moved or resized, its position or size changes; when the root |
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55 | pixmap is replaced by another one the root background changes; or when the |
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56 | timer elapses), then the expression will be evaluated again. |
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57 | |
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58 | For example, an expression such as C<scale load "$HOME/mybg.png"> scales the |
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59 | image to the window size, so it relies on the window size and will |
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60 | be reevaluated each time it is changed, but not when it moves for |
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61 | example. That ensures that the picture always fills the terminal, even |
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62 | after its size changes. |
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63 | |
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64 | =head2 EXPRESSIONS |
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65 | |
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66 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
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67 | which means you could use multiple lines and statements: |
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68 | |
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69 | again 3600; |
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70 | if (localtime now)[6]) { |
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71 | return scale load "$HOME/weekday.png"; |
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72 | } else { |
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73 | return scale load "$HOME/sunday.png"; |
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74 | } |
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75 | |
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76 | This expression is evaluated once per hour. It will set F<sunday.png> as |
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77 | background on Sundays, and F<weekday.png> on all other days. |
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78 | |
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79 | Fortunately, we expect that most expressions will be much simpler, with |
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80 | little Perl knowledge needed. |
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81 | |
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82 | Basically, you always start with a function that "generates" an image |
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83 | object, such as C<load>, which loads an image from disk, or C<root>, which |
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84 | returns the root window background image: |
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85 | |
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86 | load "$HOME/mypic.png" |
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87 | |
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88 | The path is usually specified as a quoted string (the exact rules can be |
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89 | found in the L<perlop> manpage). The F<$HOME> at the beginning of the |
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90 | string is expanded to the home directory. |
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91 | |
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92 | Then you prepend one or more modifiers or filtering expressions, such as |
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93 | C<scale>: |
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94 | |
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95 | scale load "$HOME/mypic.png" |
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96 | |
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97 | Just like a mathematical expression with functions, you should read these |
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98 | expressions from right to left, as the C<load> is evaluated first, and |
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99 | its result becomes the argument to the C<scale> function. |
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100 | |
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101 | Many operators also allow some parameters preceding the input image |
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102 | that modify its behaviour. For example, C<scale> without any additional |
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103 | arguments scales the image to size of the terminal window. If you specify |
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104 | an additional argument, it uses it as a scale factor (multiply by 100 to |
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105 | get a percentage): |
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106 | |
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107 | scale 2, load "$HOME/mypic.png" |
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108 | |
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109 | This enlarges the image by a factor of 2 (200%). As you can see, C<scale> |
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110 | has now two arguments, the C<200> and the C<load> expression, while |
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111 | C<load> only has one argument. Arguments are separated from each other by |
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112 | commas. |
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113 | |
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114 | Scale also accepts two arguments, which are then separate factors for both |
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115 | horizontal and vertical dimensions. For example, this halves the image |
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116 | width and doubles the image height: |
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117 | |
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118 | scale 0.5, 2, load "$HOME/mypic.png" |
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119 | |
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120 | Other effects than scaling are also readily available, for example, you can |
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121 | tile the image to fill the whole window, instead of resizing it: |
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122 | |
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123 | tile load "$HOME/mypic.png" |
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124 | |
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125 | In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator |
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126 | is kind of superfluous. |
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127 | |
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128 | Another common effect is to mirror the image, so that the same edges touch: |
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129 | |
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130 | mirror load "$HOME/mypic.png" |
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131 | |
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132 | This is also a typical background expression: |
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133 | |
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134 | rootalign root |
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135 | |
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136 | It first takes a snapshot of the screen background image, and then |
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137 | moves it to the upper left corner of the screen - the result is |
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138 | pseudo-transparency, as the image seems to be static while the window is |
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139 | moved around. |
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140 | |
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141 | =head2 CYCLES AND CACHING |
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142 | |
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143 | As has been mentioned before, the expression might be evaluated multiple |
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144 | times. Each time the expression is reevaluated, a new cycle is said to |
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145 | have begun. Many operators cache their results till the next cycle. |
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146 | |
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147 | For example, the C<load> operator keeps a copy of the image. If it is |
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148 | asked to load the same image on the next cycle it will not load it again, |
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149 | but return the cached copy. |
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150 | |
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151 | This only works for one cycle though, so as long as you load the same |
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152 | image every time, it will always be cached, but when you load a different |
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153 | image, it will forget about the first one. |
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154 | |
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155 | This allows you to either speed things up by keeping multiple images in |
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156 | memory, or conserve memory by loading images more often. |
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157 | |
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158 | For example, you can keep two images in memory and use a random one like |
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159 | this: |
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160 | |
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161 | my $img1 = load "img1.png"; |
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162 | my $img2 = load "img2.png"; |
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163 | (0.5 > rand) ? $img1 : $img2 |
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164 | |
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165 | Since both images are "loaded" every time the expression is evaluated, |
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166 | they are always kept in memory. Contrast this version: |
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167 | |
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168 | my $path1 = "img1.png"; |
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169 | my $path2 = "img2.png"; |
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170 | load ((0.5 > rand) ? $path1 : $path2) |
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171 | |
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172 | Here, a path is selected randomly, and load is only called for one image, |
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173 | so keeps only one image in memory. If, on the next evaluation, luck |
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174 | decides to use the other path, then it will have to load that image again. |
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175 | |
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176 | =head1 REFERENCE |
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177 | |
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178 | =head2 COMMAND LINE SWITCHES |
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179 | |
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180 | =over 4 |
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181 | |
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182 | =item --background-expr perl-expression |
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183 | |
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184 | Specifies the Perl expression to evaluate. |
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185 | |
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186 | =item --background-border |
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187 | |
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188 | By default, the expression creates an image that fills the full window, |
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189 | overwriting borders and any other areas, such as the scrollbar. |
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190 | |
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191 | Specifying this flag changes the behaviour, so that the image only |
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192 | replaces the background of the character area. |
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193 | |
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194 | =item --background-interval seconds |
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195 | |
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196 | Since some operations in the underlying XRender extension can effectively |
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197 | freeze your X-server for prolonged time, this extension enforces a minimum |
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198 | time between updates, which is normally about 0.1 seconds. |
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199 | |
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200 | If you want to do updates more often, you can decrease this safety |
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201 | interval with this switch. |
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202 | |
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203 | =back |
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204 | |
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205 | =cut |
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206 | |
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207 | our %_IMG_CACHE; |
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208 | our $HOME; |
11 | our ($bgdsl_self, $old, $new); |
209 | our ($self, $old, $new); |
12 | our ($l, $t, $w, $h); |
210 | our ($x, $y, $w, $h); |
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211 | |
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212 | # enforce at least this interval between updates |
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213 | our $MIN_INTERVAL = 6/59.951; |
13 | |
214 | |
14 | { |
215 | { |
15 | package urxvt::bgdsl; # background language |
216 | package urxvt::bgdsl; # background language |
16 | |
217 | |
17 | *repeat_black = \&urxvt::RepeatNone; #TODO wtf |
218 | use List::Util qw(min max sum shuffle); |
18 | *repeat_wrap = \&urxvt::RepeatNormal; |
219 | |
19 | *repeat_pad = \&urxvt::RepeatPad; |
220 | =head2 PROVIDERS/GENERATORS |
20 | *repeat_mirror = \&urxvt::RepeatReflect; |
221 | |
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222 | These functions provide an image, by loading it from disk, grabbing it |
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223 | from the root screen or by simply generating it. They are used as starting |
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224 | points to get an image you can play with. |
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225 | |
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226 | =over 4 |
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227 | |
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228 | =item load $path |
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229 | |
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230 | Loads the image at the given C<$path>. The image is set to plane tiling |
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231 | mode. |
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232 | |
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233 | Loaded images will be cached for one cycle, and shared between temrinals |
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234 | running in the same process (e.g. in C<urxvtd>). |
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235 | |
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236 | =item load_uc $path |
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237 | |
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238 | Load uncached - same as load, but does not cache the image. This function |
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239 | is most useufl if you want to optimise a background expression in some |
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240 | way. |
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241 | |
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242 | =cut |
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243 | |
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244 | sub load_uc($) { |
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245 | my ($path) = @_; |
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246 | |
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247 | $_IMG_CACHE{$path} || do { |
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248 | my $img = $self->new_img_from_file ($path); |
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249 | Scalar::Util::weaken ($_IMG_CACHE{$path} = $img); |
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250 | $img |
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251 | } |
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252 | } |
21 | |
253 | |
22 | sub load($) { |
254 | sub load($) { |
23 | my ($path) = @_; |
255 | my ($path) = @_; |
24 | |
256 | |
25 | $new->{load}{$path} = $old->{load}{$path} || $bgdsl_self->new_img_from_file ($path); |
257 | $new->{load}{$path} = $old->{load}{$path} || load_uc $path; |
26 | } |
258 | } |
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259 | |
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260 | =item root |
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261 | |
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262 | Returns the root window pixmap, that is, hopefully, the background image |
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263 | of your screen. The image is set to extend mode. |
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264 | |
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265 | This function makes your expression root sensitive, that means it will be |
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266 | reevaluated when the bg image changes. |
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267 | |
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268 | =cut |
27 | |
269 | |
28 | sub root() { |
270 | sub root() { |
29 | die "root op not supported, exg, we need you"; |
271 | $new->{again}{rootpmap} = 1; |
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272 | $self->new_img_from_root |
30 | } |
273 | } |
31 | |
274 | |
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275 | =item solid $colour |
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276 | |
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277 | =item solid $width, $height, $colour |
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278 | |
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279 | Creates a new image and completely fills it with the given colour. The |
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280 | image is set to tiling mode. |
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281 | |
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282 | If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is |
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283 | useful for solid backgrounds or for use in filtering effects. |
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284 | |
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285 | =cut |
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286 | |
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287 | sub solid($;$$) { |
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288 | my $colour = pop; |
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289 | |
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290 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
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291 | $img->fill ($colour); |
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292 | $img |
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293 | } |
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294 | |
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295 | =item clone $img |
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296 | |
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297 | Returns an exact copy of the image. This is useful if you want to have |
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298 | multiple copies of the same image to apply different effects to. |
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299 | |
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300 | =cut |
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301 | |
32 | # sub clone($) { |
302 | sub clone($) { |
33 | # $_[0]->clone |
303 | $_[0]->clone |
34 | # } |
304 | } |
35 | |
305 | |
36 | sub subrect($$$$$;$) { |
306 | =item merge $img ... |
37 | $_[0]->sub_rect ($_[1], $_[2], $_[3], $_[4], $_[5]) |
307 | |
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308 | Takes any number of images and merges them together, creating a single |
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309 | image containing them all. |
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310 | |
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311 | =cut |
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312 | |
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313 | sub merge(@) { |
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314 | #TODO |
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315 | } |
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316 | |
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317 | =head2 TILING MODES |
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318 | |
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319 | The following operators modify the tiling mode of an image, that is, the |
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320 | way that pixels outside the image area are painted when the image is used. |
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321 | |
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322 | =over 4 |
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323 | |
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324 | =item tile $img |
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325 | |
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326 | Tiles the whole plane with the image and returns this new image - or in |
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327 | other words, it returns a copy of the image in plane tiling mode. |
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328 | |
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329 | Example: load an image and tile it over the background, without |
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330 | resizing. The C<tile> call is superfluous because C<load> already defaults |
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331 | to tiling mode. |
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332 | |
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333 | tile load "mybg.png" |
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334 | |
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335 | =item mirror $img |
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336 | |
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337 | Similar to tile, but reflects the image each time it uses a new copy, so |
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338 | that top edges always touch top edges, right edges always touch right |
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339 | edges and so on (with normal tiling, left edges always touch right edges |
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340 | and top always touch bottom edges). |
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341 | |
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342 | Example: load an image and mirror it over the background, avoiding sharp |
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343 | edges at the image borders at the expense of mirroring the image itself |
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344 | |
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345 | mirror load "mybg.png" |
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346 | |
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347 | =item pad $img |
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348 | |
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349 | Takes an image and modifies it so that all pixels outside the image area |
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350 | become transparent. This mode is most useful when you want to place an |
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351 | image over another image or the background colour while leaving all |
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352 | background pixels outside the image unchanged. |
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353 | |
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354 | Example: load an image and display it in the upper left corner. The rest |
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355 | of the space is left "empty" (transparent or whatever your compositor does |
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356 | in alpha mode, else background colour). |
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357 | |
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358 | pad load "mybg.png" |
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359 | |
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360 | =item extend $img |
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361 | |
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362 | Extends the image over the whole plane, using the closest pixel in the |
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363 | area outside the image. This mode is mostly useful when you use more complex |
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364 | filtering operations and want the pixels outside the image to have the |
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365 | same values as the pixels near the edge. |
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366 | |
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367 | Example: just for curiosity, how does this pixel extension stuff work? |
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368 | |
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369 | extend move 50, 50, load "mybg.png" |
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370 | |
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371 | =cut |
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372 | |
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373 | sub pad($) { |
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374 | my $img = $_[0]->clone; |
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375 | $img->repeat_mode (urxvt::RepeatNone); |
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376 | $img |
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377 | } |
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378 | |
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379 | sub tile($) { |
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380 | my $img = $_[0]->clone; |
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381 | $img->repeat_mode (urxvt::RepeatNormal); |
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382 | $img |
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383 | } |
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384 | |
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385 | sub mirror($) { |
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386 | my $img = $_[0]->clone; |
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387 | $img->repeat_mode (urxvt::RepeatReflect); |
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388 | $img |
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389 | } |
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390 | |
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391 | sub extend($) { |
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392 | my $img = $_[0]->clone; |
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393 | $img->repeat_mode (urxvt::RepeatPad); |
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394 | $img |
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395 | } |
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396 | |
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397 | =back |
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398 | |
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399 | =head2 VARIABLE VALUES |
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400 | |
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401 | The following functions provide variable data such as the terminal window |
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402 | dimensions. They are not (Perl-) variables, they just return stuff that |
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403 | varies. Most of them make your expression sensitive to some events, for |
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404 | example using C<TW> (terminal width) means your expression is evaluated |
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405 | again when the terminal is resized. |
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406 | |
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407 | =over 4 |
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408 | |
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409 | =item TX |
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410 | |
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411 | =item TY |
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412 | |
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413 | Return the X and Y coordinates of the terminal window (the terminal |
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414 | window is the full window by default, and the character area only when in |
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415 | border-respect mode). |
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416 | |
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417 | Using these functions make your expression sensitive to window moves. |
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418 | |
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419 | These functions are mainly useful to align images to the root window. |
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420 | |
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421 | Example: load an image and align it so it looks as if anchored to the |
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422 | background. |
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423 | |
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424 | move -TX, -TY, load "mybg.png" |
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425 | |
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426 | =item TW |
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427 | |
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428 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
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429 | terminal window is the full window by default, and the character area only |
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430 | when in border-respect mode). |
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431 | |
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432 | Using these functions make your expression sensitive to window resizes. |
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433 | |
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434 | These functions are mainly useful to scale images, or to clip images to |
|
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435 | the window size to conserve memory. |
|
|
436 | |
|
|
437 | Example: take the screen background, clip it to the window size, blur it a |
|
|
438 | bit, align it to the window position and use it as background. |
|
|
439 | |
|
|
440 | clip move -TX, -TY, once { blur 5, root } |
|
|
441 | |
|
|
442 | =cut |
|
|
443 | |
|
|
444 | sub TX() { $new->{again}{position} = 1; $x } |
|
|
445 | sub TY() { $new->{again}{position} = 1; $y } |
|
|
446 | sub TW() { $new->{again}{size} = 1; $w } |
|
|
447 | sub TH() { $new->{again}{size} = 1; $h } |
|
|
448 | |
|
|
449 | =item now |
|
|
450 | |
|
|
451 | Returns the current time as (fractional) seconds since the epoch. |
|
|
452 | |
|
|
453 | Using this expression does I<not> make your expression sensitive to time, |
|
|
454 | but the next two functions do. |
|
|
455 | |
|
|
456 | =item again $seconds |
|
|
457 | |
|
|
458 | When this function is used the expression will be reevaluated again in |
|
|
459 | C<$seconds> seconds. |
|
|
460 | |
|
|
461 | Example: load some image and rotate it according to the time of day (as if it were |
|
|
462 | the hour pointer of a clock). Update this image every minute. |
|
|
463 | |
|
|
464 | again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
|
|
465 | |
|
|
466 | =item counter $seconds |
|
|
467 | |
|
|
468 | Like C<again>, but also returns an increasing counter value, starting at |
|
|
469 | 0, which might be useful for some simple animation effects. |
|
|
470 | |
|
|
471 | =cut |
|
|
472 | |
|
|
473 | sub now() { urxvt::NOW } |
|
|
474 | |
|
|
475 | sub again($) { |
|
|
476 | $new->{again}{time} = $_[0]; |
|
|
477 | } |
|
|
478 | |
|
|
479 | sub counter($) { |
|
|
480 | $new->{again}{time} = $_[0]; |
|
|
481 | $self->{counter} + 0 |
|
|
482 | } |
|
|
483 | |
|
|
484 | =back |
|
|
485 | |
|
|
486 | =head2 SHAPE CHANGING OPERATORS |
|
|
487 | |
|
|
488 | The following operators modify the shape, size or position of the image. |
|
|
489 | |
|
|
490 | =over 4 |
|
|
491 | |
|
|
492 | =item clip $img |
|
|
493 | |
|
|
494 | =item clip $width, $height, $img |
|
|
495 | |
|
|
496 | =item clip $x, $y, $width, $height, $img |
|
|
497 | |
|
|
498 | Clips an image to the given rectangle. If the rectangle is outside the |
|
|
499 | image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is |
|
|
500 | larger than the image, then the tiling mode defines how the extra pixels |
|
|
501 | will be filled. |
|
|
502 | |
|
|
503 | If C<$x> an C<$y> are missing, then C<0> is assumed for both. |
|
|
504 | |
|
|
505 | If C<$width> and C<$height> are missing, then the window size will be |
|
|
506 | assumed. |
|
|
507 | |
|
|
508 | Example: load an image, blur it, and clip it to the window size to save |
|
|
509 | memory. |
|
|
510 | |
|
|
511 | clip blur 10, load "mybg.png" |
|
|
512 | |
|
|
513 | =cut |
|
|
514 | |
|
|
515 | sub clip($;$$;$$) { |
|
|
516 | my $img = pop; |
|
|
517 | my $h = pop || TH; |
|
|
518 | my $w = pop || TW; |
|
|
519 | $img->sub_rect ($_[0], $_[1], $w, $h) |
|
|
520 | } |
|
|
521 | |
|
|
522 | =item scale $img |
|
|
523 | |
|
|
524 | =item scale $size_factor, $img |
|
|
525 | |
|
|
526 | =item scale $width_factor, $height_factor, $img |
|
|
527 | |
|
|
528 | Scales the image by the given factors in horizontal |
|
|
529 | (C<$width>) and vertical (C<$height>) direction. |
|
|
530 | |
|
|
531 | If only one factor is give, it is used for both directions. |
|
|
532 | |
|
|
533 | If no factors are given, scales the image to the window size without |
|
|
534 | keeping aspect. |
|
|
535 | |
|
|
536 | =item resize $width, $height, $img |
|
|
537 | |
|
|
538 | Resizes the image to exactly C<$width> times C<$height> pixels. |
|
|
539 | |
|
|
540 | =item fit $img |
|
|
541 | |
|
|
542 | =item fit $width, $height, $img |
|
|
543 | |
|
|
544 | Fits the image into the given C<$width> and C<$height> without changing |
|
|
545 | aspect, or the terminal size. That means it will be shrunk or grown until |
|
|
546 | the whole image fits into the given area, possibly leaving borders. |
|
|
547 | |
|
|
548 | =item cover $img |
|
|
549 | |
|
|
550 | =item cover $width, $height, $img |
|
|
551 | |
|
|
552 | Similar to C<fit>, but shrinks or grows until all of the area is covered |
|
|
553 | by the image, so instead of potentially leaving borders, it will cut off |
|
|
554 | image data that doesn't fit. |
|
|
555 | |
|
|
556 | =cut |
|
|
557 | |
|
|
558 | sub scale($;$;$) { |
|
|
559 | my $img = pop; |
|
|
560 | |
|
|
561 | @_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h) |
|
|
562 | : @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h) |
|
|
563 | : $img->scale (TW, TH) |
38 | } |
564 | } |
39 | |
565 | |
40 | sub resize($$$) { |
566 | sub resize($$$) { |
41 | $_[0]->scale ($_[1], $_[2]) |
567 | my $img = pop; |
|
|
568 | $img->scale ($_[0], $_[1]) |
42 | } |
569 | } |
43 | |
570 | |
|
|
571 | sub fit($;$$) { |
|
|
572 | my $img = pop; |
|
|
573 | my $w = ($_[0] || TW) / $img->w; |
|
|
574 | my $h = ($_[1] || TH) / $img->h; |
|
|
575 | scale +(min $w, $h), $img |
|
|
576 | } |
|
|
577 | |
|
|
578 | sub cover($;$$) { |
|
|
579 | my $img = pop; |
|
|
580 | my $w = ($_[0] || TW) / $img->w; |
|
|
581 | my $h = ($_[1] || TH) / $img->h; |
|
|
582 | scale +(max $w, $h), $img |
|
|
583 | } |
|
|
584 | |
|
|
585 | =item move $dx, $dy, $img |
|
|
586 | |
|
|
587 | Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in |
|
|
588 | the vertical. |
|
|
589 | |
|
|
590 | Example: move the image right by 20 pixels and down by 30. |
|
|
591 | |
|
|
592 | move 20, 30, ... |
|
|
593 | |
|
|
594 | =item align $xalign, $yalign, $img |
|
|
595 | |
|
|
596 | Aligns the image according to a factor - C<0> means the image is moved to |
|
|
597 | the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is |
|
|
598 | exactly centered and C<1> means it touches the right or bottom edge. |
|
|
599 | |
|
|
600 | Example: remove any visible border around an image, center it vertically but move |
|
|
601 | it to the right hand side. |
|
|
602 | |
|
|
603 | align 1, 0.5, pad $img |
|
|
604 | |
|
|
605 | =item center $img |
|
|
606 | |
|
|
607 | =item center $width, $height, $img |
|
|
608 | |
|
|
609 | Centers the image, i.e. the center of the image is moved to the center of |
|
|
610 | the terminal window (or the box specified by C<$width> and C<$height> if |
|
|
611 | given). |
|
|
612 | |
|
|
613 | Example: load an image and center it. |
|
|
614 | |
|
|
615 | center pad load "mybg.png" |
|
|
616 | |
|
|
617 | =item rootalign $img |
|
|
618 | |
|
|
619 | Moves the image so that it appears glued to the screen as opposed to the |
|
|
620 | window. This gives the illusion of a larger area behind the window. It is |
|
|
621 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
|
|
622 | top left of the screen. |
|
|
623 | |
|
|
624 | Example: load a background image, put it in mirror mode and root align it. |
|
|
625 | |
|
|
626 | rootalign mirror load "mybg.png" |
|
|
627 | |
|
|
628 | Example: take the screen background and align it, giving the illusion of |
|
|
629 | transparency as long as the window isn't in front of other windows. |
|
|
630 | |
|
|
631 | rootalign root |
|
|
632 | |
|
|
633 | =cut |
|
|
634 | |
44 | sub move($$$;$) { |
635 | sub move($$;$) { |
45 | # TODO: must be simpler |
636 | my $img = pop->clone; |
46 | $_[0]->transform ($_[0]->w, $_[0]->h, |
637 | $img->move ($_[0], $_[1]); |
47 | 1, 0, $_[1], |
638 | $img |
48 | 0, 1, $_[2], |
639 | } |
49 | 0, 0, 1, |
640 | |
50 | $_[3], |
641 | sub align($;$$) { |
|
|
642 | my $img = pop; |
|
|
643 | |
|
|
644 | move $_[0] * (TW - $img->w), |
|
|
645 | $_[1] * (TH - $img->h), |
|
|
646 | $img |
|
|
647 | } |
|
|
648 | |
|
|
649 | sub center($;$$) { |
|
|
650 | my $img = pop; |
|
|
651 | my $w = $_[0] || TW; |
|
|
652 | my $h = $_[1] || TH; |
|
|
653 | |
|
|
654 | move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img |
|
|
655 | } |
|
|
656 | |
|
|
657 | sub rootalign($) { |
|
|
658 | move -TX, -TY, $_[0] |
|
|
659 | } |
|
|
660 | |
|
|
661 | =item rotate $center_x, $center_y, $degrees |
|
|
662 | |
|
|
663 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
|
|
664 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
|
|
665 | width/height). |
|
|
666 | |
|
|
667 | #TODO# new width, height, maybe more operators? |
|
|
668 | |
|
|
669 | Example: rotate the image by 90 degrees |
|
|
670 | |
|
|
671 | =cut |
|
|
672 | |
|
|
673 | sub rotate($$$$) { |
|
|
674 | my $img = pop; |
|
|
675 | $img->rotate ( |
|
|
676 | $_[0] * $img->w, |
|
|
677 | $_[1] * $img->h, |
|
|
678 | $_[2] * (3.14159265 / 180), |
51 | ) |
679 | ) |
52 | } |
680 | } |
53 | |
681 | |
54 | sub rotate($$$$$$;$) { |
682 | =back |
55 | $_[0]->rotate ( |
|
|
56 | $_[1], |
|
|
57 | $_[2], |
|
|
58 | $_[3] * $_[0]->w * .01, |
|
|
59 | $_[4] * $_[0]->h * .01, |
|
|
60 | $_[5] * (3.14159265 / 180), |
|
|
61 | $_[6], |
|
|
62 | ) |
|
|
63 | } |
|
|
64 | |
683 | |
65 | sub blur($$$) { |
684 | =head2 COLOUR MODIFICATIONS |
66 | my ($img, $rh, $rv) = @_; |
|
|
67 | |
685 | |
68 | $img = $img->clone; |
686 | The following operators change the pixels of the image. |
69 | $img->blur ($rh, $rv); |
687 | |
70 | $img |
688 | =over 4 |
71 | } |
689 | |
|
|
690 | =item contrast $factor, $img |
|
|
691 | |
|
|
692 | =item contrast $r, $g, $b, $img |
|
|
693 | |
|
|
694 | =item contrast $r, $g, $b, $a, $img |
|
|
695 | |
|
|
696 | Adjusts the I<contrast> of an image. |
|
|
697 | |
|
|
698 | The first form applies a single C<$factor> to red, green and blue, the |
|
|
699 | second form applies separate factors to each colour channel, and the last |
|
|
700 | form includes the alpha channel. |
|
|
701 | |
|
|
702 | Values from 0 to 1 lower the contrast, values higher than 1 increase the |
|
|
703 | contrast. |
|
|
704 | |
|
|
705 | Due to limitations in the underlying XRender extension, lowering contrast |
|
|
706 | also reduces brightness, while increasing contrast currently also |
|
|
707 | increases brightness. |
|
|
708 | |
|
|
709 | =item brightness $bias, $img |
|
|
710 | |
|
|
711 | =item brightness $r, $g, $b, $img |
|
|
712 | |
|
|
713 | =item brightness $r, $g, $b, $a, $img |
|
|
714 | |
|
|
715 | Adjusts the brightness of an image. |
|
|
716 | |
|
|
717 | The first form applies a single C<$bias> to red, green and blue, the |
|
|
718 | second form applies separate biases to each colour channel, and the last |
|
|
719 | form includes the alpha channel. |
|
|
720 | |
|
|
721 | Values less than 0 reduce brightness, while values larger than 0 increase |
|
|
722 | it. Useful range is from -1 to 1 - the former results in a black, the |
|
|
723 | latter in a white picture. |
|
|
724 | |
|
|
725 | Due to idiosyncrasies in the underlying XRender extension, biases less |
|
|
726 | than zero can be I<very> slow. |
|
|
727 | |
|
|
728 | =cut |
72 | |
729 | |
73 | sub contrast($$;$$;$) { |
730 | sub contrast($$;$$;$) { |
|
|
731 | my $img = pop; |
74 | my ($img, $r, $g, $b, $a) = @_; |
732 | my ($r, $g, $b, $a) = @_; |
75 | |
733 | |
76 | ($g, $b) = ($r, $r) if @_ < 4; |
734 | ($g, $b) = ($r, $r) if @_ < 3; |
77 | $a = 1 if @_ < 5; |
735 | $a = 1 if @_ < 4; |
78 | |
736 | |
79 | $img = $img->clone; |
737 | $img = $img->clone; |
80 | $img->contrast ($r, $g, $b, $a); |
738 | $img->contrast ($r, $g, $b, $a); |
81 | $img |
739 | $img |
82 | } |
740 | } |
83 | |
741 | |
84 | sub brightness($$;$$;$) { |
742 | sub brightness($$;$$;$) { |
|
|
743 | my $img = pop; |
85 | my ($img, $r, $g, $b, $a) = @_; |
744 | my ($r, $g, $b, $a) = @_; |
86 | |
745 | |
87 | ($g, $b) = ($r, $r) if @_ < 4; |
746 | ($g, $b) = ($r, $r) if @_ < 3; |
88 | $a = 1 if @_ < 5; |
747 | $a = 1 if @_ < 4; |
89 | |
748 | |
90 | $img = $img->clone; |
749 | $img = $img->clone; |
91 | $img->brightness ($r, $g, $b, $a); |
750 | $img->brightness ($r, $g, $b, $a); |
92 | $img |
751 | $img |
93 | } |
752 | } |
94 | |
753 | |
95 | sub X() { $new->{position_sensitive} = 1; $l } |
754 | =item blur $radius, $img |
96 | sub Y() { $new->{position_sensitive} = 1; $t } |
|
|
97 | sub W() { $new->{size_sensitive} = 1; $w } |
|
|
98 | sub H() { $new->{size_sensitive} = 1; $h } |
|
|
99 | |
755 | |
100 | sub now() { urxvt::NOW } |
756 | =item blur $radius_horz, $radius_vert, $img |
101 | |
757 | |
102 | sub again($) { |
758 | Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii |
|
|
759 | can also be specified separately. |
|
|
760 | |
|
|
761 | Blurring is often I<very> slow, at least compared or other |
|
|
762 | operators. Larger blur radii are slower than smaller ones, too, so if you |
|
|
763 | don't want to freeze your screen for long times, start experimenting with |
|
|
764 | low values for radius (<5). |
|
|
765 | |
|
|
766 | =cut |
|
|
767 | |
|
|
768 | sub blur($$;$) { |
|
|
769 | my $img = pop; |
|
|
770 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
|
|
771 | } |
|
|
772 | |
|
|
773 | =back |
|
|
774 | |
|
|
775 | =head2 OTHER STUFF |
|
|
776 | |
|
|
777 | Anything that didn't fit any of the other categories, even after applying |
|
|
778 | force and closing our eyes. |
|
|
779 | |
|
|
780 | =over 4 |
|
|
781 | |
|
|
782 | =item once { ... } |
|
|
783 | |
|
|
784 | This function takes a code block as argument, that is, one or more |
|
|
785 | statements enclosed by braces. |
|
|
786 | |
|
|
787 | The trick is that this code block is only evaluated once - future calls |
|
|
788 | will simply return the original image (yes, it should only be used with |
|
|
789 | images). |
|
|
790 | |
|
|
791 | This can be extremely useful to avoid redoign the same slow operations |
|
|
792 | again and again- for example, if your background expression takes the root |
|
|
793 | background, blurs it and then root-aligns it it would have to blur the |
|
|
794 | root background on every window move or resize. |
|
|
795 | |
|
|
796 | Putting the blur into a C<once> block will make sure the blur is only done |
|
|
797 | once: |
|
|
798 | |
|
|
799 | rootlign once { blur 10, root } |
|
|
800 | |
|
|
801 | This leaves the question of how to force reevaluation of the block, in |
|
|
802 | case the root background changes: Right now, all once blocks forget that |
|
|
803 | they ahve been executed before each time the root background changes (if |
|
|
804 | the expression is sensitive to that) or when C<once_again> is called. |
|
|
805 | |
|
|
806 | =item once_again |
|
|
807 | |
|
|
808 | Resets all C<once> block as if they had never been called, i.e. on the |
|
|
809 | next call they will be reevaluated again. |
|
|
810 | |
|
|
811 | =cut |
|
|
812 | |
|
|
813 | sub once(&) { |
|
|
814 | my $once = $self->{once_cache}{$_[0]+0} ||= do { |
|
|
815 | local $new->{again}; |
|
|
816 | my @res = $_[0](); |
|
|
817 | [$new->{again}, \@res] |
|
|
818 | }; |
|
|
819 | |
103 | $new->{again} = $_[0]; |
820 | $new->{again} = { |
104 | } |
821 | %{ $new->{again} }, |
|
|
822 | %{ $once->[0] } |
|
|
823 | }; |
105 | |
824 | |
106 | sub counter($) { |
825 | # in scalar context we always return the first original result, which |
107 | $new->{again} = $_[0]; |
826 | # is not quite how perl works. |
108 | $bgdsl_self->{counter}++ + 0 |
827 | wantarray |
|
|
828 | ? @{ $once->[1] } |
|
|
829 | : $once->[1][0] |
109 | } |
830 | } |
|
|
831 | |
|
|
832 | sub once_again() { |
|
|
833 | delete $self->{once_cache}; |
|
|
834 | } |
|
|
835 | |
|
|
836 | =back |
|
|
837 | |
|
|
838 | =cut |
|
|
839 | |
110 | } |
840 | } |
111 | |
841 | |
112 | sub parse_expr { |
842 | sub parse_expr { |
113 | my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}"; |
843 | my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}"; |
114 | die if $@; |
844 | die if $@; |
… | |
… | |
123 | $self->recalculate; |
853 | $self->recalculate; |
124 | } |
854 | } |
125 | |
855 | |
126 | # evaluate the current bg expression |
856 | # evaluate the current bg expression |
127 | sub recalculate { |
857 | sub recalculate { |
128 | my ($self) = @_; |
858 | my ($arg_self) = @_; |
129 | |
859 | |
130 | local $bgdsl_self = $self; |
860 | # rate limit evaluation |
131 | |
861 | |
|
|
862 | if ($arg_self->{next_refresh} > urxvt::NOW) { |
|
|
863 | $arg_self->{next_refresh_timer} = urxvt::timer->new->after ($arg_self->{next_refresh} - urxvt::NOW)->cb (sub { |
|
|
864 | $arg_self->recalculate; |
|
|
865 | }); |
|
|
866 | return; |
|
|
867 | } |
|
|
868 | |
|
|
869 | $arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
|
|
870 | |
|
|
871 | # set environment to evaluate user expression |
|
|
872 | |
|
|
873 | local $self = $arg_self; |
|
|
874 | |
|
|
875 | local $HOME = $ENV{HOME}; |
132 | local $old = $self->{state}; |
876 | local $old = $self->{state}; |
133 | local $new = my $state = $self->{state} = {}; |
877 | local $new = my $state = $self->{state} = {}; |
134 | |
878 | |
135 | ($l, $t, $w, $h) = |
879 | ($x, $y, $w, $h) = |
136 | $self->get_geometry; |
880 | $self->background_geometry ($self->{border}); |
|
|
881 | |
|
|
882 | # evaluate user expression |
137 | |
883 | |
138 | my $img = eval { $self->{expr}->() }; |
884 | my $img = eval { $self->{expr}->() }; |
139 | warn $@ if $@;#d# |
885 | warn $@ if $@;#d# |
|
|
886 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
140 | |
887 | |
141 | my $repeat; |
888 | # if the expression is sensitive to external events, prepare reevaluation then |
142 | |
889 | |
143 | if (my $again = $state->{again}) { |
890 | my $again = delete $state->{again}; |
144 | $repeat = 1; |
|
|
145 | $state->{again} = urxvt::timer->new->after ($again)->cb (sub { $self->recalculate }); |
|
|
146 | } |
|
|
147 | |
891 | |
148 | if (delete $state->{position_sensitive}) { |
892 | $again->{size} = 1 |
149 | $repeat = 1; |
893 | if $img->repeat_mode != urxvt::RepeatNormal; |
|
|
894 | |
|
|
895 | if (my $again = $again->{time}) { |
|
|
896 | my $self = $self; |
|
|
897 | $state->{timer} = $again == $old->{again} |
|
|
898 | ? $old->{timer} |
|
|
899 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
|
|
900 | ++$self->{counter}; |
|
|
901 | $self->recalculate |
|
|
902 | }); |
|
|
903 | } |
|
|
904 | |
|
|
905 | if ($again->{position}) { |
150 | $self->enable (position_change => sub { $_[0]->recalculate }); |
906 | $self->enable (position_change => sub { $_[0]->recalculate }); |
151 | } else { |
907 | } else { |
152 | $self->disable ("position_change"); |
908 | $self->disable ("position_change"); |
153 | } |
909 | } |
154 | |
910 | |
155 | if (delete $state->{size_sensitive}) { |
911 | if ($again->{size}) { |
156 | $repeat = 1; |
|
|
157 | $self->enable (size_change => sub { $_[0]->recalculate }); |
912 | $self->enable (size_change => sub { $_[0]->recalculate }); |
158 | } else { |
913 | } else { |
159 | $self->disable ("size_change"); |
914 | $self->disable ("size_change"); |
160 | } |
915 | } |
161 | |
916 | |
162 | $img = $img->sub_rect (0, 0, $w, $h) |
917 | if ($again->{rootpmap}) { |
163 | if $img->w != $w || $img->h != $h; |
918 | $self->enable (rootpmap_change => sub { |
|
|
919 | delete $_[0]{once_cache}; # this will override once-block values from |
|
|
920 | $_[0]->recalculate; |
|
|
921 | }); |
|
|
922 | } else { |
|
|
923 | $self->disable ("rootpmap_change"); |
|
|
924 | } |
164 | |
925 | |
|
|
926 | # clear stuff we no longer need |
|
|
927 | |
|
|
928 | %$old = (); |
|
|
929 | |
|
|
930 | unless (%$again) { |
|
|
931 | delete $self->{state}; |
|
|
932 | delete $self->{expr}; |
|
|
933 | } |
|
|
934 | |
|
|
935 | # set background pixmap |
|
|
936 | |
165 | $self->set_background ($img); |
937 | $self->set_background ($img, $self->{border}); |
166 | $self->scr_recolour (0); |
938 | $self->scr_recolour (0); |
167 | $self->want_refresh; |
939 | $self->want_refresh; |
168 | } |
940 | } |
169 | |
941 | |
170 | sub on_start { |
942 | sub on_start { |
171 | my ($self) = @_; |
943 | my ($self) = @_; |
172 | |
944 | |
|
|
945 | my $expr = $self->x_resource ("%.expr") |
|
|
946 | or return; |
|
|
947 | |
|
|
948 | $self->has_render |
|
|
949 | or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n"; |
|
|
950 | |
173 | $self->set_expr (parse_expr $EXPR); |
951 | $self->set_expr (parse_expr $expr); |
|
|
952 | $self->{border} = $self->x_resource_boolean ("%.border"); |
|
|
953 | |
|
|
954 | $MIN_INTERVAL = $self->x_resource ("%.interval"); |
174 | |
955 | |
175 | () |
956 | () |
176 | } |
957 | } |
177 | |
958 | |