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 |
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5 | #:META:X_RESOURCE:%.interval:seconds:minimum time between updates |
5 | |
6 | |
6 | #TODO: once, rootalign |
7 | #TODO: once, rootalign |
7 | |
8 | |
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9 | =head1 NAME |
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10 | |
8 | =head1 background - manage terminal background |
11 | background - manage terminal background |
9 | |
12 | |
10 | =head2 SYNOPSIS |
13 | =head1 SYNOPSIS |
11 | |
14 | |
12 | rxvt -background-expr 'background expression' |
15 | urxvt --background-expr 'background expression' |
13 | -background-border |
16 | --background-border |
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17 | --background-interval seconds |
14 | |
18 | |
15 | =head2 DESCRIPTION |
19 | =head1 DESCRIPTION |
16 | |
20 | |
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21 | This extension manages the terminal background by creating a picture that |
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22 | is behind the text, replacing the normal background colour. |
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23 | |
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24 | It does so by evaluating a Perl expression that I<calculates> the image on |
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25 | the fly, for example, by grabbing the root background or loading a file. |
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26 | |
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27 | While the full power of Perl is available, the operators have been design |
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28 | to be as simple as possible. |
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29 | |
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30 | For example, to load an image and scale it to the window size, you would |
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31 | use: |
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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 | Or specified as a X resource: |
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36 | |
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37 | URxvt.background-expr: scale load "/path/to/mybg.png" |
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38 | |
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39 | =head1 THEORY OF OPERATION |
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40 | |
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41 | At startup, just before the window is mapped for the first time, the |
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42 | expression is evaluated and must yield an image. The image is then |
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43 | extended as necessary to cover the whole terminal window, and is set as a |
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44 | background pixmap. |
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45 | |
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46 | If the image contains an alpha channel, then it will be used as-is in |
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47 | visuals that support alpha channels (for example, for a compositing |
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48 | manager). In other visuals, the terminal background colour will be used to |
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49 | replace any transparency. |
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50 | |
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51 | When the expression relies, directly or indirectly, on the window size, |
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52 | position, the root pixmap, or a timer, then it will be remembered. If not, |
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53 | then it will be removed. |
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54 | |
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55 | If any of the parameters that the expression relies on changes (when the |
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56 | window is moved or resized, its position or size changes; when the root |
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57 | pixmap is replaced by another one the root background changes; or when the |
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58 | timer elapses), then the expression will be evaluated again. |
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59 | |
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60 | For example, an expression such as C<scale load "$HOME/mybg.png"> scales the |
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61 | image to the window size, so it relies on the window size and will |
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62 | be reevaluated each time it is changed, but not when it moves for |
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63 | example. That ensures that the picture always fills the terminal, even |
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64 | after it's size changes. |
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65 | |
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66 | =head2 EXPRESSIONS |
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67 | |
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68 | Expressions are normal Perl expressions, in fact, they are Perl blocks - |
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69 | which means you could use multiple lines and statements: |
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70 | |
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71 | again 3600; |
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72 | if (localtime now)[6]) { |
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73 | return scale load "$HOME/weekday.png"; |
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74 | } else { |
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75 | return scale load "$HOME/sunday.png"; |
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76 | } |
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77 | |
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78 | This expression gets evaluated once per hour. It will set F<sunday.png> as |
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79 | background on Sundays, and F<weekday.png> on all other days. |
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80 | |
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81 | Fortunately, we expect that most expressions will be much simpler, with |
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82 | little Perl knowledge needed. |
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83 | |
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84 | Basically, you always start with a function that "generates" an image |
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85 | object, such as C<load>, which loads an image from disk, or C<root>, which |
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86 | returns the root window background image: |
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87 | |
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88 | load "$HOME/mypic.png" |
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89 | |
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90 | The path is usually specified as a quoted string (the exact rules can be |
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91 | found in the L<perlop> manpage). The F<$HOME> at the beginning of the |
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92 | string is expanded to the home directory. |
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93 | |
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94 | Then you prepend one or more modifiers or filtering expressions, such as |
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95 | C<scale>: |
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96 | |
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97 | scale load "$HOME/mypic.png" |
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98 | |
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99 | Just like a mathematical expression with functions, you should read these |
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100 | expressions from right to left, as the C<load> is evaluated first, and |
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101 | its result becomes the argument to the C<scale> function. |
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102 | |
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103 | Many operators also allow some parameters preceding the input image |
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104 | that modify its behaviour. For example, C<scale> without any additional |
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105 | arguments scales the image to size of the terminal window. If you specify |
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106 | an additional argument, it uses it as a scale factor (multiply by 100 to |
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107 | get a percentage): |
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108 | |
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109 | scale 2, load "$HOME/mypic.png" |
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110 | |
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111 | This enlarges the image by a factor of 2 (200%). As you can see, C<scale> |
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112 | has now two arguments, the C<200> and the C<load> expression, while |
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113 | C<load> only has one argument. Arguments are separated from each other by |
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114 | commas. |
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115 | |
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116 | Scale also accepts two arguments, which are then separate factors for both |
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117 | horizontal and vertical dimensions. For example, this halves the image |
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118 | width and doubles the image height: |
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119 | |
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120 | scale 0.5, 2, load "$HOME/mypic.png" |
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121 | |
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122 | Other effects than scalign are also readily available, for exmaple, you can |
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123 | tile the image to fill the whole window, instead of resizing it: |
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124 | |
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125 | tile load "$HOME/mypic.png" |
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126 | |
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127 | In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator |
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128 | is kind of superfluous. |
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129 | |
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130 | Another common effect is to mirror the image, so that the same edges touch: |
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131 | |
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132 | mirror load "$HOME/mypic.png" |
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133 | |
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134 | This is also a typical background expression: |
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135 | |
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136 | rootalign root |
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137 | |
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138 | It first takes a snapshot of the screen background image, and then |
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139 | moves it to the upper left corner of the screen - the result is |
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140 | pseudo-transparency, as the image seems to be static while the window is |
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141 | moved around. |
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142 | |
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143 | =head2 CYCLES AND CACHING |
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144 | |
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145 | As has been mentioned before, the expression might be evaluated multiple |
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146 | times. Each time the expression is reevaluated, a new cycle is said to |
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147 | have begun. Many operators cache their results till the next cycle. |
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148 | |
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149 | For example, the C<load> operator keeps a copy of the image. If it is |
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150 | asked to load the same image on the next cycle it will not load it again, |
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151 | but return the cached copy. |
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152 | |
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153 | This only works for one cycle though, so as long as you load the same |
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154 | image every time, it will always be cached, but when you load a different |
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155 | image, it will forget about the first one. |
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156 | |
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157 | This allows you to either speed things up by keeping multiple images in |
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158 | memory, or comserve memory by loading images more often. |
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159 | |
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160 | For example, you can keep two images in memory and use a random one like |
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161 | this: |
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162 | |
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163 | my $img1 = load "img1.png"; |
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164 | my $img2 = load "img2.png"; |
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165 | (0.5 > rand) ? $img1 : $img2 |
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166 | |
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167 | Since both images are "loaded" every time the expression is evaluated, |
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168 | they are always kept in memory. Contrast this version: |
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169 | |
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170 | my $path1 = "img1.png"; |
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171 | my $path2 = "img2.png"; |
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172 | load ((0.5 > rand) ? $path1 : $path2) |
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173 | |
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174 | Here, a path is selected randomly, and load is only called for one image, |
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175 | so keeps only one image in memory. If, on the next evaluation, luck |
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176 | decides to use the other path, then it will have to load that image again. |
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177 | |
17 | =head2 REFERENCE |
178 | =head1 REFERENCE |
18 | |
179 | |
19 | =cut |
180 | =head2 COMMAND LINE SWITCHES |
20 | |
181 | |
21 | our $EXPR; |
182 | =over 4 |
22 | #$EXPR = 'move W * 0.1, -H * 0.1, resize W * 0.5, H * 0.5, repeat_none load "opensource.png"'; |
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23 | $EXPR = 'move -TX, -TY, load "argb.png"'; |
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24 | #$EXPR = ' |
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25 | # rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
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26 | # clip X, Y, W, H, repeat_mirror, |
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27 | # load "/root/pix/das_fette_schwein.jpg" |
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28 | #'; |
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29 | #$EXPR = 'solid "red"'; |
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30 | #$EXPR = 'blur root, 10, 10' |
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31 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
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32 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
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33 | |
183 | |
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184 | =item --background-expr perl-expression |
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185 | |
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186 | Specifies the Perl expression to evaluate. |
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187 | |
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188 | =item --background-border |
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189 | |
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190 | By default, the expression creates an image that fills the full window, |
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191 | overwriting borders and any other areas, such as the scrollbar. |
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192 | |
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193 | Specifying this flag changes the behaviour, so that the image only |
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194 | replaces the background of the character area. |
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195 | |
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196 | =item --background-interval seconds |
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197 | |
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198 | Since some operations in the underlying XRender extension can effetively |
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199 | freeze your X-server for prolonged time, this extension enforces a minimum |
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200 | time between updates, which is normally about 0.1 seconds. |
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201 | |
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202 | If you want to do updates more often, you can decrease this safety |
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203 | interval with this switch. |
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204 | |
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205 | =back |
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206 | |
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207 | =cut |
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208 | |
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209 | our $HOME; |
34 | our ($self, $old, $new); |
210 | our ($self, $old, $new); |
35 | our ($x, $y, $w, $h); |
211 | our ($x, $y, $w, $h); |
36 | |
212 | |
37 | # enforce at least this interval between updates |
213 | # enforce at least this interval between updates |
38 | our $MIN_INTERVAL = 1/100; |
214 | our $MIN_INTERVAL = 6/59.951; |
39 | |
215 | |
40 | { |
216 | { |
41 | package urxvt::bgdsl; # background language |
217 | package urxvt::bgdsl; # background language |
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218 | |
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219 | use List::Util qw(min max sum shuffle); |
42 | |
220 | |
43 | =head2 PROVIDERS/GENERATORS |
221 | =head2 PROVIDERS/GENERATORS |
44 | |
222 | |
45 | These functions provide an image, by loading it from disk, grabbing it |
223 | These functions provide an image, by loading it from disk, grabbing it |
46 | from the root screen or by simply generating it. They are used as starting |
224 | from the root screen or by simply generating it. They are used as starting |
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83 | =item solid $width, $height, $colour |
261 | =item solid $width, $height, $colour |
84 | |
262 | |
85 | Creates a new image and completely fills it with the given colour. The |
263 | Creates a new image and completely fills it with the given colour. The |
86 | image is set to tiling mode. |
264 | image is set to tiling mode. |
87 | |
265 | |
88 | If <$width> and C<$height> are omitted, it creates a 1x1 image, which is |
266 | If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is |
89 | useful for solid backgrounds or for use in filtering effects. |
267 | useful for solid backgrounds or for use in filtering effects. |
90 | |
268 | |
91 | =cut |
269 | =cut |
92 | |
270 | |
93 | sub solid($$;$) { |
271 | sub solid($;$$) { |
94 | my $colour = pop; |
272 | my $colour = pop; |
95 | |
273 | |
96 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
274 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
97 | $img->fill ($colour); |
275 | $img->fill ($colour); |
98 | $img |
276 | $img |
99 | } |
277 | } |
100 | |
278 | |
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279 | =item clone $img |
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280 | |
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281 | Returns an exact copy of the image. This is useful if you want to have |
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282 | multiple copies of the same image to apply different effects to. |
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283 | |
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284 | =cut |
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285 | |
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286 | sub clone($) { |
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287 | $_[0]->clone |
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288 | } |
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289 | |
101 | =back |
290 | =back |
102 | |
291 | |
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292 | =head2 TILING MODES |
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293 | |
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294 | The following operators modify the tiling mode of an image, that is, the |
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295 | way that pixels outside the image area are painted when the image is used. |
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296 | |
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297 | =over 4 |
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298 | |
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299 | =item tile $img |
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300 | |
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301 | Tiles the whole plane with the image and returns this new image - or in |
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302 | other words, it returns a copy of the image in plane tiling mode. |
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303 | |
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304 | Example: load an image and tile it over the background, without |
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305 | resizing. The C<tile> call is superfluous because C<load> already defaults |
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306 | to tiling mode. |
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307 | |
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308 | tile load "mybg.png" |
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309 | |
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310 | =item mirror $img |
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311 | |
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312 | Similar to tile, but reflects the image each time it uses a new copy, so |
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313 | that top edges always touch top edges, right edges always touch right |
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314 | edges and so on (with normal tiling, left edges always touch right edges |
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315 | and top always touch bottom edges). |
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316 | |
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317 | Example: load an image and mirror it over the background, avoiding sharp |
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318 | edges at the image borders at the expense of mirroring the image itself |
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319 | |
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320 | mirror load "mybg.png" |
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321 | |
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322 | =item pad $img |
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323 | |
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324 | Takes an image and modifies it so that all pixels outside the image area |
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325 | become transparent. This mode is most useful when you want to place an |
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326 | image over another image or the background colour while leaving all |
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327 | background pixels outside the image unchanged. |
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328 | |
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329 | Example: load an image and display it in the upper left corner. The rest |
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330 | of the space is left "empty" (transparent or wahtever your compisotr does |
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331 | in alpha mode, else background colour). |
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332 | |
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333 | pad load "mybg.png" |
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334 | |
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335 | =item extend $img |
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336 | |
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337 | Extends the image over the whole plane, using the closest pixel in the |
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338 | area outside the image. This mode is mostly useful when you more complex |
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339 | filtering operations and want the pixels outside the image to have the |
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340 | same values as the pixels near the edge. |
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341 | |
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342 | Example: just for curiosity, how does this pixel extension stuff work? |
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343 | |
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344 | extend move 50, 50, load "mybg.png" |
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345 | |
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346 | =cut |
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347 | |
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348 | sub pad($) { |
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349 | my $img = $_[0]->clone; |
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350 | $img->repeat_mode (urxvt::RepeatNone); |
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351 | $img |
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352 | } |
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353 | |
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354 | sub tile($) { |
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355 | my $img = $_[0]->clone; |
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356 | $img->repeat_mode (urxvt::RepeatNormal); |
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357 | $img |
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358 | } |
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359 | |
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360 | sub mirror($) { |
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361 | my $img = $_[0]->clone; |
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362 | $img->repeat_mode (urxvt::RepeatReflect); |
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363 | $img |
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364 | } |
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365 | |
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366 | sub extend($) { |
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367 | my $img = $_[0]->clone; |
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368 | $img->repeat_mode (urxvt::RepeatPad); |
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369 | $img |
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370 | } |
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371 | |
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372 | =back |
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373 | |
103 | =head2 VARIABLES |
374 | =head2 VARIABLE VALUES |
104 | |
375 | |
105 | The following functions provide variable data such as the terminal |
376 | The following functions provide variable data such as the terminal window |
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377 | dimensions. They are not (Perl-) variables, they just return stuff that |
106 | window dimensions. Most of them make your expression sensitive to some |
378 | varies. Most of them make your expression sensitive to some events, for |
107 | events, for example using C<TW> (terminal width) means your expression is |
379 | example using C<TW> (terminal width) means your expression is evaluated |
108 | evaluated again when the terminal is resized. |
380 | again when the terminal is resized. |
109 | |
381 | |
110 | =over 4 |
382 | =over 4 |
111 | |
383 | |
112 | =item TX |
384 | =item TX |
113 | |
385 | |
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160 | |
432 | |
161 | When this function is used the expression will be reevaluated again in |
433 | When this function is used the expression will be reevaluated again in |
162 | C<$seconds> seconds. |
434 | C<$seconds> seconds. |
163 | |
435 | |
164 | Example: load some image and rotate it according to the time of day (as if it were |
436 | Example: load some image and rotate it according to the time of day (as if it were |
165 | the hour pointer of a clock). update this image every minute. |
437 | the hour pointer of a clock). Update this image every minute. |
166 | |
438 | |
167 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
439 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
168 | |
440 | |
169 | =item counter $seconds |
441 | =item counter $seconds |
170 | |
442 | |
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184 | $self->{counter} + 0 |
456 | $self->{counter} + 0 |
185 | } |
457 | } |
186 | |
458 | |
187 | =back |
459 | =back |
188 | |
460 | |
189 | =head2 TILING MODES |
461 | =head2 SHAPE CHANGING OPERATORS |
190 | |
462 | |
191 | The following operators modify the tiling mode of an image, that is, the |
463 | The following operators modify the shape, size or position of the image. |
192 | way that pixels outside the image area are painted when the image is used. |
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193 | |
464 | |
194 | =over 4 |
465 | =over 4 |
195 | |
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196 | =item tile $img |
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197 | |
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198 | Tiles the whole plane with the image and returns this new image - or in |
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199 | other words, it returns a copy of the image in plane tiling mode. |
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200 | |
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201 | Example: load an image and tile it over the background, without |
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202 | resizing. The C<tile> call is superfluous because C<load> already defaults |
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203 | to tiling mode. |
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204 | |
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205 | tile load "mybg.png" |
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206 | |
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207 | =item mirror $img |
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208 | |
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209 | Similar to tile, but reflects the image each time it uses a new copy, so |
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210 | that top edges always touch top edges, right edges always touch right |
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211 | edges and so on (with normal tiling, left edges always touch right edges |
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212 | and top always touch bottom edges). |
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213 | |
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214 | Exmaple: load an image and mirror it over the background, avoiding sharp |
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215 | edges at the image borders at the expense of mirroring the image itself |
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216 | |
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217 | mirror load "mybg.png" |
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218 | |
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219 | =item pad $img |
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220 | |
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221 | Takes an image and modifies it so that all pixels outside the image area |
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222 | become transparent. This mode is most useful when you want to place an |
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223 | image over another image or the background colour while leaving all |
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224 | background pixels outside the image unchanged. |
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225 | |
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226 | Example: load an image and display it in the upper left corner. The rets |
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227 | of the space is left "empty" (transparent or wahtever your compisotr does |
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228 | in alpha mode, else background colour). |
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229 | |
|
|
230 | pad load "mybg.png" |
|
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231 | |
|
|
232 | =item extend $img |
|
|
233 | |
|
|
234 | Extends the image over the whole plane, using the closest pixel in the |
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235 | area outside the image. This mode is mostly useful when you more complex |
|
|
236 | filtering operations and want the pixels outside the image to have the |
|
|
237 | same values as the pixels near the edge. |
|
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238 | |
|
|
239 | Example: just for curiosity, how does this pixel extension stuff work? |
|
|
240 | |
|
|
241 | extend move 50, 50, load "mybg.png" |
|
|
242 | |
|
|
243 | =cut |
|
|
244 | |
|
|
245 | sub pad($) { |
|
|
246 | my $img = $_[0]->clone; |
|
|
247 | $img->repeat_mode (urxvt::RepeatNone); |
|
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248 | $img |
|
|
249 | } |
|
|
250 | |
|
|
251 | sub tile($) { |
|
|
252 | my $img = $_[0]->clone; |
|
|
253 | $img->repeat_mode (urxvt::RepeatNormal); |
|
|
254 | $img |
|
|
255 | } |
|
|
256 | |
|
|
257 | sub mirror($) { |
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258 | my $img = $_[0]->clone; |
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259 | $img->repeat_mode (urxvt::RepeatReflect); |
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260 | $img |
|
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261 | } |
|
|
262 | |
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263 | sub extend($) { |
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264 | my $img = $_[0]->clone; |
|
|
265 | $img->repeat_mode (urxvt::RepeatPad); |
|
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266 | $img |
|
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267 | } |
|
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268 | |
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|
269 | =back |
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270 | |
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|
271 | =head2 PIXEL OPERATORS |
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272 | |
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|
273 | The following operators modify the image pixels in various ways. |
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274 | |
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275 | =over 4 |
|
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276 | |
|
|
277 | =item clone $img |
|
|
278 | |
|
|
279 | Returns an exact copy of the image. |
|
|
280 | |
|
|
281 | =cut |
|
|
282 | |
|
|
283 | sub clone($) { |
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|
284 | $_[0]->clone |
|
|
285 | } |
|
|
286 | |
466 | |
287 | =item clip $img |
467 | =item clip $img |
288 | |
468 | |
289 | =item clip $width, $height, $img |
469 | =item clip $width, $height, $img |
290 | |
470 | |
… | |
… | |
314 | $img->sub_rect ($_[0], $_[1], $w, $h) |
494 | $img->sub_rect ($_[0], $_[1], $w, $h) |
315 | } |
495 | } |
316 | |
496 | |
317 | =item scale $img |
497 | =item scale $img |
318 | |
498 | |
319 | =item scale $size_percent, $img |
499 | =item scale $size_factor, $img |
320 | |
500 | |
321 | =item scale $width_percent, $height_percent, $img |
501 | =item scale $width_factor, $height_factor, $img |
322 | |
502 | |
323 | Scales the image by the given percentages in horizontal |
503 | Scales the image by the given factors in horizontal |
324 | (C<$width_percent>) and vertical (C<$height_percent>) direction. |
504 | (C<$width>) and vertical (C<$height>) direction. |
325 | |
505 | |
326 | If only one percentage is give, it is used for both directions. |
506 | If only one factor is give, it is used for both directions. |
327 | |
507 | |
328 | If no percentages are given, scales the image to the window size without |
508 | If no factors are given, scales the image to the window size without |
329 | keeping aspect. |
509 | keeping aspect. |
330 | |
510 | |
331 | =item resize $width, $height, $img |
511 | =item resize $width, $height, $img |
332 | |
512 | |
333 | Resizes the image to exactly C<$width> times C<$height> pixels. |
513 | Resizes the image to exactly C<$width> times C<$height> pixels. |
334 | |
514 | |
335 | =cut |
515 | =item fit $img |
336 | |
516 | |
337 | #TODO: maximise, maximise_fill? |
517 | =item fit $width, $height, $img |
|
|
518 | |
|
|
519 | Fits the image into the given C<$width> and C<$height> without changing |
|
|
520 | aspect, or the terminal size. That means it will be shrunk or grown until |
|
|
521 | the whole image fits into the given area, possibly leaving borders. |
|
|
522 | |
|
|
523 | =item cover $img |
|
|
524 | |
|
|
525 | =item cover $width, $height, $img |
|
|
526 | |
|
|
527 | Similar to C<fit>, but shrinks or grows until all of the area is covered |
|
|
528 | by the image, so instead of potentially leaving borders, it will cut off |
|
|
529 | image data that doesn't fit. |
|
|
530 | |
|
|
531 | =cut |
338 | |
532 | |
339 | sub scale($;$;$) { |
533 | sub scale($;$;$) { |
340 | my $img = pop; |
534 | my $img = pop; |
341 | |
535 | |
342 | @_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01) |
536 | @_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h) |
343 | : @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01) |
537 | : @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h) |
344 | : $img->scale (TW, TH) |
538 | : $img->scale (TW, TH) |
345 | } |
539 | } |
346 | |
540 | |
347 | sub resize($$$) { |
541 | sub resize($$$) { |
348 | my $img = pop; |
542 | my $img = pop; |
349 | $img->scale ($_[0], $_[1]) |
543 | $img->scale ($_[0], $_[1]) |
350 | } |
544 | } |
|
|
545 | |
|
|
546 | sub fit($;$$) { |
|
|
547 | my $img = pop; |
|
|
548 | my $w = ($_[0] || TW) / $img->w; |
|
|
549 | my $h = ($_[1] || TH) / $img->h; |
|
|
550 | scale +(min $w, $h), $img |
|
|
551 | } |
|
|
552 | |
|
|
553 | sub cover($;$$) { |
|
|
554 | my $img = pop; |
|
|
555 | my $w = ($_[0] || TW) / $img->w; |
|
|
556 | my $h = ($_[1] || TH) / $img->h; |
|
|
557 | scale +(max $w, $h), $img |
|
|
558 | } |
|
|
559 | |
|
|
560 | =item move $dx, $dy, $img |
|
|
561 | |
|
|
562 | Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in |
|
|
563 | the vertical. |
|
|
564 | |
|
|
565 | Example: move the image right by 20 pixels and down by 30. |
|
|
566 | |
|
|
567 | move 20, 30, ... |
|
|
568 | |
|
|
569 | =item align $xalign, $yalign, $img |
|
|
570 | |
|
|
571 | Aligns the image according to a factor - C<0> means the image is moved to |
|
|
572 | the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is |
|
|
573 | exactly centered and C<1> means it touches the right or bottom edge. |
|
|
574 | |
|
|
575 | Example: remove any visible border around an image, center it vertically but move |
|
|
576 | it to the right hand side. |
|
|
577 | |
|
|
578 | align 1, 0.5, pad $img |
|
|
579 | |
|
|
580 | =item center $img |
|
|
581 | |
|
|
582 | =item center $width, $height, $img |
|
|
583 | |
|
|
584 | Centers the image, i.e. the center of the image is moved to the center of |
|
|
585 | the terminal window (or the box specified by C<$width> and C<$height> if |
|
|
586 | given). |
|
|
587 | |
|
|
588 | Example: load an image and center it. |
|
|
589 | |
|
|
590 | center pad load "mybg.png" |
|
|
591 | |
|
|
592 | =item rootalign $img |
|
|
593 | |
|
|
594 | Moves the image so that it appears glued to the screen as opposed to the |
|
|
595 | window. This gives the illusion of a larger area behind the window. It is |
|
|
596 | exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the |
|
|
597 | top left of the screen. |
|
|
598 | |
|
|
599 | Example: load a background image, put it in mirror mode and root align it. |
|
|
600 | |
|
|
601 | rootalign mirror load "mybg.png" |
|
|
602 | |
|
|
603 | Example: take the screen background and align it, giving the illusion of |
|
|
604 | transparency as long as the window isn't in front of other windows. |
|
|
605 | |
|
|
606 | rootalign root |
|
|
607 | |
|
|
608 | =cut |
351 | |
609 | |
352 | sub move($$;$) { |
610 | sub move($$;$) { |
353 | my $img = pop->clone; |
611 | my $img = pop->clone; |
354 | $img->move ($_[0], $_[1]); |
612 | $img->move ($_[0], $_[1]); |
355 | $img |
613 | $img |
356 | } |
614 | } |
357 | |
615 | |
|
|
616 | sub align($;$$) { |
|
|
617 | my $img = pop; |
|
|
618 | |
|
|
619 | move $_[0] * (TW - $img->w), |
|
|
620 | $_[1] * (TH - $img->h), |
|
|
621 | $img |
|
|
622 | } |
|
|
623 | |
|
|
624 | sub center($;$$) { |
|
|
625 | my $img = pop; |
|
|
626 | my $w = $_[0] || TW; |
|
|
627 | my $h = $_[1] || TH; |
|
|
628 | |
|
|
629 | move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img |
|
|
630 | } |
|
|
631 | |
|
|
632 | sub rootalign($) { |
|
|
633 | move -TX, -TY, $_[0] |
|
|
634 | } |
|
|
635 | |
|
|
636 | =back |
|
|
637 | |
|
|
638 | =head2 COLOUR MODIFICATIONS |
|
|
639 | |
|
|
640 | The following operators change the pixels of the image. |
|
|
641 | |
|
|
642 | =over 4 |
|
|
643 | |
|
|
644 | =item contrast $factor, $img |
|
|
645 | |
|
|
646 | =item contrast $r, $g, $b, $img |
|
|
647 | |
|
|
648 | =item contrast $r, $g, $b, $a, $img |
|
|
649 | |
|
|
650 | Adjusts the I<contrast> of an image. |
|
|
651 | |
|
|
652 | The first form applies a single C<$factor> to red, green and blue, the |
|
|
653 | second form applies separate factors to each colour channel, and the last |
|
|
654 | form includes the alpha channel. |
|
|
655 | |
|
|
656 | Values from 0 to 1 lower the contrast, values higher than 1 increase the |
|
|
657 | contrast. |
|
|
658 | |
|
|
659 | Due to limitations in the underlying XRender extension, lowering contrast |
|
|
660 | also reduces brightness, while increasing contrast currently also |
|
|
661 | increases brightness. |
|
|
662 | |
|
|
663 | =item brightness $bias, $img |
|
|
664 | |
|
|
665 | =item brightness $r, $g, $b, $img |
|
|
666 | |
|
|
667 | =item brightness $r, $g, $b, $a, $img |
|
|
668 | |
|
|
669 | Adjusts the brightness of an image. |
|
|
670 | |
|
|
671 | The first form applies a single C<$bias> to red, green and blue, the |
|
|
672 | second form applies separate biases to each colour channel, and the last |
|
|
673 | form includes the alpha channel. |
|
|
674 | |
|
|
675 | Values less than 0 reduce brightness, while values larger than 0 increase |
|
|
676 | it. Useful range is from -1 to 1 - the former results in a black, the |
|
|
677 | latter in a white picture. |
|
|
678 | |
|
|
679 | Due to idiosynchrasies in the underlying XRender extension, biases less |
|
|
680 | than zero can be I<very> slow. |
|
|
681 | |
|
|
682 | =cut |
|
|
683 | |
|
|
684 | sub contrast($$;$$;$) { |
|
|
685 | my $img = pop; |
|
|
686 | my ($r, $g, $b, $a) = @_; |
|
|
687 | |
|
|
688 | ($g, $b) = ($r, $r) if @_ < 4; |
|
|
689 | $a = 1 if @_ < 5; |
|
|
690 | |
|
|
691 | $img = $img->clone; |
|
|
692 | $img->contrast ($r, $g, $b, $a); |
|
|
693 | $img |
|
|
694 | } |
|
|
695 | |
|
|
696 | sub brightness($$;$$;$) { |
|
|
697 | my $img = pop; |
|
|
698 | my ($r, $g, $b, $a) = @_; |
|
|
699 | |
|
|
700 | ($g, $b) = ($r, $r) if @_ < 4; |
|
|
701 | $a = 1 if @_ < 5; |
|
|
702 | |
|
|
703 | $img = $img->clone; |
|
|
704 | $img->brightness ($r, $g, $b, $a); |
|
|
705 | $img |
|
|
706 | } |
|
|
707 | |
|
|
708 | =item blur $radius, $img |
|
|
709 | |
|
|
710 | =item blur $radius_horz, $radius_vert, $img |
|
|
711 | |
|
|
712 | Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii |
|
|
713 | can also be specified separately. |
|
|
714 | |
|
|
715 | Blurring is often I<very> slow, at least compared or other |
|
|
716 | operators. Larger blur radii are slower than smaller ones, too, so if you |
|
|
717 | don't want to freeze your screen for long times, start experimenting with |
|
|
718 | low values for radius (<5). |
|
|
719 | |
|
|
720 | =cut |
|
|
721 | |
|
|
722 | sub blur($$;$) { |
|
|
723 | my $img = pop; |
|
|
724 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
|
|
725 | } |
|
|
726 | |
|
|
727 | =item rotate $new_width, $new_height, $center_x, $center_y, $degrees |
|
|
728 | |
|
|
729 | Rotates the image by C<$degrees> degrees, counter-clockwise, around the |
|
|
730 | pointer at C<$center_x> and C<$center_y> (specified as factor of image |
|
|
731 | width/height), generating a new image with width C<$new_width> and height |
|
|
732 | C<$new_height>. |
|
|
733 | |
|
|
734 | #TODO# new width, height, maybe more operators? |
|
|
735 | |
|
|
736 | Example: rotate the image by 90 degrees |
|
|
737 | |
|
|
738 | =cut |
|
|
739 | |
358 | sub rotate($$$$$$) { |
740 | sub rotate($$$$$$) { |
359 | my $img = pop; |
741 | my $img = pop; |
360 | $img->rotate ( |
742 | $img->rotate ( |
361 | $_[0], |
743 | $_[0], |
362 | $_[1], |
744 | $_[1], |
363 | $_[2] * $img->w * .01, |
745 | $_[2] * $img->w, |
364 | $_[3] * $img->h * .01, |
746 | $_[3] * $img->h, |
365 | $_[4] * (3.14159265 / 180), |
747 | $_[4] * (3.14159265 / 180), |
366 | ) |
748 | ) |
367 | } |
|
|
368 | |
|
|
369 | sub blur($$;$) { |
|
|
370 | my $img = pop; |
|
|
371 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
|
|
372 | } |
|
|
373 | |
|
|
374 | sub contrast($$;$$;$) { |
|
|
375 | my $img = pop; |
|
|
376 | my ($r, $g, $b, $a) = @_; |
|
|
377 | |
|
|
378 | ($g, $b) = ($r, $r) if @_ < 4; |
|
|
379 | $a = 1 if @_ < 5; |
|
|
380 | |
|
|
381 | $img = $img->clone; |
|
|
382 | $img->contrast ($r, $g, $b, $a); |
|
|
383 | $img |
|
|
384 | } |
|
|
385 | |
|
|
386 | sub brightness($$;$$;$) { |
|
|
387 | my $img = pop; |
|
|
388 | my ($r, $g, $b, $a) = @_; |
|
|
389 | |
|
|
390 | ($g, $b) = ($r, $r) if @_ < 4; |
|
|
391 | $a = 1 if @_ < 5; |
|
|
392 | |
|
|
393 | $img = $img->clone; |
|
|
394 | $img->brightness ($r, $g, $b, $a); |
|
|
395 | $img |
|
|
396 | } |
749 | } |
397 | |
750 | |
398 | =back |
751 | =back |
399 | |
752 | |
400 | =cut |
753 | =cut |
… | |
… | |
432 | |
785 | |
433 | # set environment to evaluate user expression |
786 | # set environment to evaluate user expression |
434 | |
787 | |
435 | local $self = $arg_self; |
788 | local $self = $arg_self; |
436 | |
789 | |
|
|
790 | local $HOME = $ENV{HOME}; |
437 | local $old = $self->{state}; |
791 | local $old = $self->{state}; |
438 | local $new = my $state = $self->{state} = {}; |
792 | local $new = my $state = $self->{state} = {}; |
439 | |
793 | |
440 | ($x, $y, $w, $h) = |
794 | ($x, $y, $w, $h) = |
441 | $self->background_geometry ($self->{border}); |
795 | $self->background_geometry ($self->{border}); |
442 | |
796 | |
443 | # evaluate user expression |
797 | # evaluate user expression |
444 | |
798 | |
445 | my $img = eval { $self->{expr}->() }; |
799 | my $img = eval { $self->{expr}->() }; |
446 | warn $@ if $@;#d# |
800 | warn $@ if $@;#d# |
447 | die if !UNIVERSAL::isa $img, "urxvt::img"; |
801 | die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img"; |
448 | |
802 | |
449 | $state->{size_sensitive} = 1 |
803 | $state->{size_sensitive} = 1 |
450 | if $img->repeat_mode != urxvt::RepeatNormal; |
804 | if $img->repeat_mode != urxvt::RepeatNormal; |
451 | |
805 | |
452 | # if the expression is sensitive to external events, prepare reevaluation then |
806 | # if the expression is sensitive to external events, prepare reevaluation then |
… | |
… | |
502 | } |
856 | } |
503 | |
857 | |
504 | sub on_start { |
858 | sub on_start { |
505 | my ($self) = @_; |
859 | my ($self) = @_; |
506 | |
860 | |
507 | my $expr = $self->x_resource ("background.expr") |
861 | my $expr = $self->x_resource ("%.expr") |
508 | or return; |
862 | or return; |
509 | |
863 | |
|
|
864 | $self->has_render |
|
|
865 | or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n"; |
|
|
866 | |
510 | $self->set_expr (parse_expr $expr); |
867 | $self->set_expr (parse_expr $expr); |
511 | $self->{border} = $self->x_resource_boolean ("background.border"); |
868 | $self->{border} = $self->x_resource_boolean ("%.border"); |
|
|
869 | |
|
|
870 | $MIN_INTERVAL = $self->x_resource ("%.interval"); |
512 | |
871 | |
513 | () |
872 | () |
514 | } |
873 | } |
515 | |
874 | |