1 | #! perl |
1 | #! perl |
2 | |
2 | |
3 | #:META:RESOURCE:$$:string:background expression |
3 | #:META:X_RESOURCE:%.expr:string:background expression |
4 | #:META:RESOURCE:$$-enable:boolean:some boolean |
4 | #:META:X_RESOURCE:%.border.:boolean:respect the terminal border |
5 | |
5 | |
6 | our $EXPR = 'move load "/root/pix/das_fette_schwein.jpg", repeat_wrap, X, Y'; |
6 | =head1 background - manage terminal background |
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7 | |
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8 | =head2 SYNOPSIS |
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9 | |
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10 | rxvt -background-expr 'background expression' |
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11 | -background-border |
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12 | |
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13 | =head2 DESCRIPTION |
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14 | |
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15 | =head2 REFERENCE |
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16 | |
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17 | =cut |
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18 | |
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19 | our $EXPR; |
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20 | #$EXPR = 'move W * 0.1, -H * 0.1, resize W * 0.5, H * 0.5, repeat_none load "opensource.png"'; |
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21 | $EXPR = 'move -TX, -TY, load "argb.png"'; |
7 | $EXPR = ' |
22 | #$EXPR = ' |
8 | rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
23 | # rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
9 | clip X, Y, W, H, repeat_mirror, |
24 | # clip X, Y, W, H, repeat_mirror, |
10 | load "/root/pix/das_fette_schwein.jpg" |
25 | # load "/root/pix/das_fette_schwein.jpg" |
11 | '; |
26 | #'; |
12 | $EXPR = 'solid "red"'; |
27 | #$EXPR = 'solid "red"'; |
13 | #$EXPR = 'blur root, 10, 10' |
28 | #$EXPR = 'blur root, 10, 10' |
14 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
29 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
15 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
30 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
16 | |
31 | |
17 | use Safe; |
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18 | |
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19 | our ($bgdsl_self, $old, $new); |
32 | our ($self, $old, $new); |
20 | our ($l, $t, $w, $h); |
33 | our ($x, $y, $w, $h); |
21 | |
34 | |
22 | # enforce at leats this time between updates |
35 | # enforce at least this interval between updates |
23 | our $MIN_INTERVAL = 1/100; |
36 | our $MIN_INTERVAL = 1/100; |
24 | |
37 | |
25 | { |
38 | { |
26 | package urxvt::bgdsl; # background language |
39 | package urxvt::bgdsl; # background language |
27 | |
40 | |
28 | *repeat_black = \&urxvt::RepeatNone; #TODO wtf |
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29 | *repeat_wrap = \&urxvt::RepeatNormal; |
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30 | *repeat_pad = \&urxvt::RepeatPad; |
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31 | *repeat_mirror = \&urxvt::RepeatReflect; |
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32 | |
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33 | =head2 PROVIDERS/GENERATORS |
41 | =head2 PROVIDERS/GENERATORS |
34 | |
42 | |
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43 | These functions provide an image, by loading it from disk, grabbing it |
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44 | from the root screen or by simply generating it. They are used as starting |
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45 | points to get an image you can play with. |
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46 | |
35 | =over 4 |
47 | =over 4 |
36 | |
48 | |
37 | =item load $path |
49 | =item load $path |
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50 | |
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51 | Loads the image at the given C<$path>. The image is set to plane tiling |
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52 | mode. |
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53 | |
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54 | Loaded images will be cached for one cycle. |
38 | |
55 | |
39 | =cut |
56 | =cut |
40 | |
57 | |
41 | sub load($) { |
58 | sub load($) { |
42 | my ($path) = @_; |
59 | my ($path) = @_; |
43 | |
60 | |
44 | $new->{load}{$path} = $old->{load}{$path} || $bgdsl_self->new_img_from_file ($path); |
61 | $new->{load}{$path} = $old->{load}{$path} || $self->new_img_from_file ($path); |
45 | } |
62 | } |
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63 | |
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64 | =item root |
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65 | |
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66 | Returns the root window pixmap, that is, hopefully, the background image |
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67 | of your screen. The image is set to extend mode. |
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68 | |
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69 | This function makes your expression root sensitive, that means it will be |
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70 | reevaluated when the bg image changes. |
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71 | |
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72 | =cut |
46 | |
73 | |
47 | sub root() { |
74 | sub root() { |
48 | $new->{rootpmap_sensitive} = 1; |
75 | $new->{rootpmap_sensitive} = 1; |
49 | die "root op not supported, exg, we need you"; |
76 | die "root op not supported, exg, we need you"; |
50 | } |
77 | } |
51 | |
78 | |
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79 | =item solid $colour |
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80 | |
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81 | =item solid $width, $height, $colour |
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82 | |
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83 | Creates a new image and completely fills it with the given colour. The |
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84 | image is set to tiling mode. |
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85 | |
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86 | If <$width> and C<$height> are omitted, it creates a 1x1 image, which is |
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87 | useful for solid backgrounds or for use in filtering effects. |
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88 | |
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89 | =cut |
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90 | |
52 | sub solid($;$$) { |
91 | sub solid($$;$) { |
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92 | my $colour = pop; |
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93 | |
53 | my $img = $bgdsl_self->new_img (urxvt::PictStandardARGB32, $_[1] || 1, $_[2] || 1); |
94 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
54 | $img->fill ($_[0]); |
95 | $img->fill ($colour); |
55 | $img |
96 | $img |
56 | } |
97 | } |
57 | |
98 | |
58 | =back |
99 | =back |
59 | |
100 | |
60 | =head2 OPERATORS |
101 | =head2 VARIABLES |
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102 | |
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103 | The following functions provide variable data such as the terminal |
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104 | window dimensions. Most of them make your expression sensitive to some |
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105 | events, for example using C<TW> (terminal width) means your expression is |
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106 | evaluated again when the terminal is resized. |
61 | |
107 | |
62 | =over 4 |
108 | =over 4 |
63 | |
109 | |
64 | =cut |
110 | =item TX |
65 | |
111 | |
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112 | =item TY |
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113 | |
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114 | Return the X and Y coordinates of the terminal window (the terminal |
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115 | window is the full window by default, and the character area only when in |
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116 | border-respect mode). |
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117 | |
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118 | Using these functions make your expression sensitive to window moves. |
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119 | |
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120 | These functions are mainly useful to align images to the root window. |
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121 | |
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122 | Example: load an image and align it so it looks as if anchored to the |
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123 | background. |
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124 | |
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125 | move -TX, -TY, load "mybg.png" |
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126 | |
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127 | =item TW |
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128 | |
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129 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
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130 | terminal window is the full window by default, and the character area only |
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131 | when in border-respect mode). |
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132 | |
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133 | Using these functions make your expression sensitive to window resizes. |
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134 | |
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135 | These functions are mainly useful to scale images, or to clip images to |
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136 | the window size to conserve memory. |
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137 | |
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138 | Example: take the screen background, clip it to the window size, blur it a |
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139 | bit, align it to the window position and use it as background. |
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140 | |
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141 | clip move -TX, -TY, blur 5, root |
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142 | |
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143 | =cut |
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144 | |
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145 | sub TX() { $new->{position_sensitive} = 1; $x } |
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146 | sub TY() { $new->{position_sensitive} = 1; $y } |
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147 | sub TW() { $new->{size_sensitive} = 1; $w } |
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148 | sub TH() { $new->{size_sensitive} = 1; $h } |
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149 | |
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150 | =item now |
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151 | |
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152 | Returns the current time as (fractional) seconds since the epoch. |
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153 | |
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154 | Using this expression does I<not> make your expression sensitive to time, |
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155 | but the next two functions do. |
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156 | |
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157 | =item again $seconds |
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158 | |
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159 | When this function is used the expression will be reevaluated again in |
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160 | C<$seconds> seconds. |
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161 | |
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162 | Example: load some image and rotate it according to the time of day (as if it were |
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163 | the hour pointer of a clock). update this image every minute. |
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164 | |
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165 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
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166 | |
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167 | =item counter $seconds |
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168 | |
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169 | Like C<again>, but also returns an increasing counter value, starting at |
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170 | 0, which might be useful for some simple animation effects. |
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171 | |
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172 | =cut |
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173 | |
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174 | sub now() { urxvt::NOW } |
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175 | |
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176 | sub again($) { |
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177 | $new->{again} = $_[0]; |
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178 | } |
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179 | |
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180 | sub counter($) { |
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181 | $new->{again} = $_[0]; |
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182 | $self->{counter} + 0 |
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183 | } |
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184 | |
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185 | =back |
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186 | |
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187 | =head2 TILING MODES |
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188 | |
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189 | The following operators modify the tiling mode of an image, that is, the |
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190 | way that pixels outside the image area are painted when the image is used. |
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191 | |
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192 | =over 4 |
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193 | |
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194 | =item tile $img |
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195 | |
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196 | Tiles the whole plane with the image and returns this new image - or in |
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197 | other words, it returns a copy of the image in plane tiling mode. |
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198 | |
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199 | =item mirror $img |
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200 | |
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201 | Similar to tile, but reflects the image each time it uses a new copy, so |
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202 | that top edges always touch top edges, right edges always touch right |
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203 | edges and so on (with normal tiling, left edges always touch right edges |
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204 | and top always touch bottom edges). |
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205 | |
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206 | =item pad $img |
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207 | |
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208 | Takes an image and modifies it so that all pixels outside the image area |
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209 | become transparent. This mode is most useful when you want to place an |
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210 | image over another image or the background colour while leaving all |
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211 | background pixels outside the image unchanged. |
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212 | |
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213 | =item extend $img |
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214 | |
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215 | Extends the image over the whole plane, using the closest pixel in the |
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216 | area outside the image. This mode is mostly useful when you more complex |
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217 | filtering operations and want the pixels outside the image to have the |
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218 | same values as the pixels near the edge. |
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219 | |
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220 | =cut |
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221 | |
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222 | sub pad($) { |
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223 | my $img = $_[0]->clone; |
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224 | $img->repeat_mode (urxvt::RepeatNone); |
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225 | $img |
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226 | } |
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227 | |
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228 | sub tile($) { |
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229 | my $img = $_[0]->clone; |
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230 | $img->repeat_mode (urxvt::RepeatNormal); |
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231 | $img |
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232 | } |
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233 | |
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234 | sub mirror($) { |
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235 | my $img = $_[0]->clone; |
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236 | $img->repeat_mode (urxvt::RepeatReflect); |
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237 | $img |
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238 | } |
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239 | |
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240 | sub extend($) { |
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241 | my $img = $_[0]->clone; |
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242 | $img->repeat_mode (urxvt::RepeatPad); |
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243 | $img |
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244 | } |
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245 | |
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246 | =back |
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247 | |
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248 | =head2 PIXEL OPERATORS |
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249 | |
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250 | The following operators modify the image pixels in various ways. |
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251 | |
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252 | =over 4 |
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253 | |
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254 | =item clone $img |
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255 | |
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256 | Returns an exact copy of the image. |
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257 | |
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258 | =cut |
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259 | |
66 | # sub clone($) { |
260 | sub clone($) { |
67 | # $_[0]->clone |
261 | $_[0]->clone |
68 | # } |
262 | } |
69 | |
263 | |
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264 | =item clip $img |
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265 | |
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266 | =item clip $width, $height, $img |
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267 | |
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268 | =item clip $x, $y, $width, $height, $img |
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269 | |
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270 | Clips an image to the given rectangle. If the rectangle is outside the |
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271 | image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is |
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272 | larger than the image, then the tiling mode defines how the extra pixels |
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273 | will be filled. |
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274 | |
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275 | If C<$x> an C<$y> are missing, then C<0> is assumed for both. |
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276 | |
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277 | If C<$width> and C<$height> are missing, then the window size will be |
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278 | assumed. |
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279 | |
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280 | Example: load an image, blur it, and clip it to the window size to save |
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281 | memory. |
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282 | |
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283 | clip blur 10, load "mybg.png" |
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284 | |
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285 | =cut |
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286 | |
70 | sub clip($$$$$;$) { |
287 | sub clip($;$$;$$) { |
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288 | my $img = pop; |
71 | my $img = pop; |
289 | my $h = pop || TH; |
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290 | my $w = pop || TW; |
72 | $img->sub_rect ($_[0], $_[1], $_[2], $_[3], $_[4]) |
291 | $img->sub_rect ($_[0], $_[1], $w, $h) |
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292 | } |
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293 | |
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294 | =item scale $img |
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295 | |
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296 | =item scale $size_percent, $img |
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297 | |
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298 | =item scale $width_percent, $height_percent, $img |
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299 | |
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300 | Scales the image by the given percentages in horizontal |
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301 | (C<$width_percent>) and vertical (C<$height_percent>) direction. |
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302 | |
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303 | If only one percentage is give, it is used for both directions. |
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304 | |
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305 | If no percentages are given, scales the image to the window size without |
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306 | keeping aspect. |
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307 | |
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308 | =item resize $width, $height, $img |
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309 | |
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310 | Resizes the image to exactly C<$width> times C<$height> pixels. |
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311 | |
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312 | =cut |
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313 | |
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314 | #TODO: maximise, maximise_fill? |
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315 | |
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316 | sub scale($;$;$) { |
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317 | my $img = pop; |
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318 | |
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319 | @_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01) |
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320 | : @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01) |
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321 | : $img->scale (TW, TH) |
73 | } |
322 | } |
74 | |
323 | |
75 | sub resize($$$) { |
324 | sub resize($$$) { |
76 | my $img = pop; |
325 | my $img = pop; |
77 | $img->scale ($_[0], $_[1]) |
326 | $img->scale ($_[0], $_[1]) |
78 | } |
327 | } |
79 | |
328 | |
80 | # TODO: ugly |
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81 | sub move($$;$) { |
329 | sub move($$;$) { |
82 | my $img = pop; |
330 | my $img = pop->clone; |
83 | $img->sub_rect ( |
331 | $img->move ($_[0], $_[1]); |
84 | $_[0], $_[1], |
332 | $img |
85 | $img->w, $img->h, |
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86 | $_[2], |
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87 | ) |
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88 | } |
333 | } |
89 | |
334 | |
90 | sub rotate($$$$$$;$) { |
335 | sub rotate($$$$$$) { |
91 | my $img = pop; |
336 | my $img = pop; |
92 | $img->rotate ( |
337 | $img->rotate ( |
93 | $_[0], |
338 | $_[0], |
94 | $_[1], |
339 | $_[1], |
95 | $_[2] * $img->w * .01, |
340 | $_[2] * $img->w * .01, |
96 | $_[3] * $img->h * .01, |
341 | $_[3] * $img->h * .01, |
97 | $_[4] * (3.14159265 / 180), |
342 | $_[4] * (3.14159265 / 180), |
98 | $_[5], |
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99 | ) |
343 | ) |
100 | } |
344 | } |
101 | |
345 | |
102 | sub blur($$$) { |
346 | sub blur($$;$) { |
103 | my ($rh, $rv, $img) = @_; |
347 | my $img = pop; |
104 | |
348 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
105 | $img->blur ($rh, $rv); |
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106 | } |
349 | } |
107 | |
350 | |
108 | sub contrast($$;$$;$) { |
351 | sub contrast($$;$$;$) { |
109 | my $img = pop; |
352 | my $img = pop; |
110 | my ($r, $g, $b, $a) = @_; |
353 | my ($r, $g, $b, $a) = @_; |
… | |
… | |
125 | $a = 1 if @_ < 5; |
368 | $a = 1 if @_ < 5; |
126 | |
369 | |
127 | $img = $img->clone; |
370 | $img = $img->clone; |
128 | $img->brightness ($r, $g, $b, $a); |
371 | $img->brightness ($r, $g, $b, $a); |
129 | $img |
372 | $img |
130 | } |
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131 | |
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132 | sub X() { $new->{position_sensitive} = 1; $l } |
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133 | sub Y() { $new->{position_sensitive} = 1; $t } |
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134 | sub W() { $new->{size_sensitive} = 1; $w } |
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135 | sub H() { $new->{size_sensitive} = 1; $h } |
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136 | |
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137 | sub now() { urxvt::NOW } |
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138 | |
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139 | sub again($) { |
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140 | $new->{again} = $_[0]; |
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141 | } |
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142 | |
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143 | sub counter($) { |
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144 | $new->{again} = $_[0]; |
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145 | $bgdsl_self->{counter} + 0 |
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146 | } |
373 | } |
147 | |
374 | |
148 | =back |
375 | =back |
149 | |
376 | |
150 | =cut |
377 | =cut |
… | |
… | |
165 | $self->recalculate; |
392 | $self->recalculate; |
166 | } |
393 | } |
167 | |
394 | |
168 | # evaluate the current bg expression |
395 | # evaluate the current bg expression |
169 | sub recalculate { |
396 | sub recalculate { |
170 | my ($self) = @_; |
397 | my ($arg_self) = @_; |
171 | |
398 | |
172 | # rate limit evaluation |
399 | # rate limit evaluation |
173 | |
400 | |
174 | if ($self->{next_refresh} > urxvt::NOW) { |
401 | if ($arg_self->{next_refresh} > urxvt::NOW) { |
175 | $self->{next_refresh_timer} = urxvt::timer->new->after ($self->{next_refresh} - urxvt::NOW)->cb (sub { |
402 | $arg_self->{next_refresh_timer} = urxvt::timer->new->after ($arg_self->{next_refresh} - urxvt::NOW)->cb (sub { |
176 | $self->recalculate; |
403 | $arg_self->recalculate; |
177 | }); |
404 | }); |
178 | return; |
405 | return; |
179 | } |
406 | } |
180 | |
407 | |
181 | $self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
408 | $arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
182 | |
409 | |
183 | # set environment to evaluate user expression |
410 | # set environment to evaluate user expression |
184 | |
411 | |
185 | local $bgdsl_self = $self; |
412 | local $self = $arg_self; |
186 | |
413 | |
187 | local $old = $self->{state}; |
414 | local $old = $self->{state}; |
188 | local $new = my $state = $self->{state} = {}; |
415 | local $new = my $state = $self->{state} = {}; |
189 | |
416 | |
190 | ($l, $t, $w, $h) = |
417 | ($x, $y, $w, $h) = |
191 | $self->get_geometry; |
418 | $self->background_geometry ($self->{border}); |
192 | |
419 | |
193 | # evaluate user expression |
420 | # evaluate user expression |
194 | |
421 | |
195 | my $img = eval { $self->{expr}->() }; |
422 | my $img = eval { $self->{expr}->() }; |
196 | warn $@ if $@;#d# |
423 | warn $@ if $@;#d# |
… | |
… | |
243 | # prepare and set background pixmap |
470 | # prepare and set background pixmap |
244 | |
471 | |
245 | $img = $img->sub_rect (0, 0, $w, $h) |
472 | $img = $img->sub_rect (0, 0, $w, $h) |
246 | if $img->w != $w || $img->h != $h; |
473 | if $img->w != $w || $img->h != $h; |
247 | |
474 | |
248 | $self->set_background ($img); |
475 | $self->set_background ($img, $self->{border}); |
249 | $self->scr_recolour (0); |
476 | $self->scr_recolour (0); |
250 | $self->want_refresh; |
477 | $self->want_refresh; |
251 | } |
478 | } |
252 | |
479 | |
253 | sub on_start { |
480 | sub on_start { |
254 | my ($self) = @_; |
481 | my ($self) = @_; |
255 | |
482 | |
|
|
483 | my $expr = $self->x_resource ("background.expr") |
|
|
484 | or return; |
|
|
485 | |
256 | $self->set_expr (parse_expr $EXPR); |
486 | $self->set_expr (parse_expr $expr); |
|
|
487 | $self->{border} = $self->x_resource_boolean ("background.border"); |
257 | |
488 | |
258 | () |
489 | () |
259 | } |
490 | } |
260 | |
491 | |