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 |
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4 | #:META:X_RESOURCE:%.border.:boolean:respect the terminal border |
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5 | |
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6 | #TODO: once, rootalign |
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7 | |
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8 | =head1 background - manage terminal background |
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9 | |
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10 | =head2 SYNOPSIS |
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11 | |
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12 | rxvt -background-expr 'background expression' |
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13 | -background-border |
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14 | |
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15 | =head2 DESCRIPTION |
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16 | |
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17 | =head2 REFERENCE |
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18 | |
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19 | =cut |
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20 | |
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21 | our $EXPR; |
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22 | #$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"'; |
4 | $EXPR = ' |
24 | #$EXPR = ' |
5 | rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
25 | # rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
6 | clip X, Y, W, H, repeat_mirror, |
26 | # clip X, Y, W, H, repeat_mirror, |
7 | load "/root/pix/das_fette_schwein.jpg" |
27 | # load "/root/pix/das_fette_schwein.jpg" |
8 | '; |
28 | #'; |
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29 | #$EXPR = 'solid "red"'; |
9 | #$EXPR = 'blur root, 10, 10' |
30 | #$EXPR = 'blur root, 10, 10' |
10 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
31 | #$EXPR = 'blur move (root, -x, -y), 5, 5' |
11 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
32 | #resize load "/root/pix/das_fette_schwein.jpg", w, h |
12 | |
33 | |
13 | use Safe; |
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14 | |
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15 | our ($bgdsl_self, $old, $new); |
34 | our ($self, $old, $new); |
16 | our ($l, $t, $w, $h); |
35 | our ($x, $y, $w, $h); |
17 | |
36 | |
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37 | # enforce at least this interval between updates |
18 | our $MIN_INTERVAL = 1/100; |
38 | our $MIN_INTERVAL = 1/100; |
19 | |
39 | |
20 | { |
40 | { |
21 | package urxvt::bgdsl; # background language |
41 | package urxvt::bgdsl; # background language |
22 | |
42 | |
23 | *repeat_black = \&urxvt::RepeatNone; #TODO wtf |
43 | =head2 PROVIDERS/GENERATORS |
24 | *repeat_wrap = \&urxvt::RepeatNormal; |
44 | |
25 | *repeat_pad = \&urxvt::RepeatPad; |
45 | These functions provide an image, by loading it from disk, grabbing it |
26 | *repeat_mirror = \&urxvt::RepeatReflect; |
46 | from the root screen or by simply generating it. They are used as starting |
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47 | points to get an image you can play with. |
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48 | |
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49 | =over 4 |
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50 | |
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51 | =item load $path |
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52 | |
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53 | Loads the image at the given C<$path>. The image is set to plane tiling |
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54 | mode. |
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55 | |
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56 | Loaded images will be cached for one cycle. |
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57 | |
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58 | =cut |
27 | |
59 | |
28 | sub load($) { |
60 | sub load($) { |
29 | my ($path) = @_; |
61 | my ($path) = @_; |
30 | |
62 | |
31 | $new->{load}{$path} = $old->{load}{$path} || $bgdsl_self->new_img_from_file ($path); |
63 | $new->{load}{$path} = $old->{load}{$path} || $self->new_img_from_file ($path); |
32 | } |
64 | } |
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65 | |
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66 | =item root |
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67 | |
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68 | Returns the root window pixmap, that is, hopefully, the background image |
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69 | of your screen. The image is set to extend mode. |
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70 | |
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71 | This function makes your expression root sensitive, that means it will be |
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72 | reevaluated when the bg image changes. |
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73 | |
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74 | =cut |
33 | |
75 | |
34 | sub root() { |
76 | sub root() { |
35 | $new->{rootpmap_sensitive} = 1; |
77 | $new->{rootpmap_sensitive} = 1; |
36 | die "root op not supported, exg, we need you"; |
78 | die "root op not supported, exg, we need you"; |
37 | } |
79 | } |
38 | |
80 | |
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81 | =item solid $colour |
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82 | |
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83 | =item solid $width, $height, $colour |
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84 | |
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85 | Creates a new image and completely fills it with the given colour. The |
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86 | image is set to tiling mode. |
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87 | |
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88 | If <$width> and C<$height> are omitted, it creates a 1x1 image, which is |
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89 | useful for solid backgrounds or for use in filtering effects. |
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90 | |
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91 | =cut |
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92 | |
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93 | sub solid($$;$) { |
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94 | my $colour = pop; |
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95 | |
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96 | my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] || 1, $_[1] || 1); |
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97 | $img->fill ($colour); |
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98 | $img |
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99 | } |
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100 | |
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101 | =back |
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102 | |
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103 | =head2 VARIABLES |
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104 | |
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105 | The following functions provide variable data such as the terminal |
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106 | window dimensions. Most of them make your expression sensitive to some |
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107 | events, for example using C<TW> (terminal width) means your expression is |
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108 | evaluated again when the terminal is resized. |
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109 | |
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110 | =over 4 |
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111 | |
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112 | =item TX |
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113 | |
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114 | =item TY |
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115 | |
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116 | Return the X and Y coordinates of the terminal window (the terminal |
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117 | window is the full window by default, and the character area only when in |
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118 | border-respect mode). |
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119 | |
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120 | Using these functions make your expression sensitive to window moves. |
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121 | |
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122 | These functions are mainly useful to align images to the root window. |
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123 | |
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124 | Example: load an image and align it so it looks as if anchored to the |
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125 | background. |
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126 | |
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127 | move -TX, -TY, load "mybg.png" |
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128 | |
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129 | =item TW |
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130 | |
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131 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
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132 | terminal window is the full window by default, and the character area only |
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133 | when in border-respect mode). |
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134 | |
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135 | Using these functions make your expression sensitive to window resizes. |
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136 | |
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137 | These functions are mainly useful to scale images, or to clip images to |
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138 | the window size to conserve memory. |
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139 | |
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140 | Example: take the screen background, clip it to the window size, blur it a |
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141 | bit, align it to the window position and use it as background. |
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142 | |
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143 | clip move -TX, -TY, blur 5, root |
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144 | |
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145 | =cut |
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146 | |
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147 | sub TX() { $new->{position_sensitive} = 1; $x } |
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148 | sub TY() { $new->{position_sensitive} = 1; $y } |
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149 | sub TW() { $new->{size_sensitive} = 1; $w } |
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150 | sub TH() { $new->{size_sensitive} = 1; $h } |
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151 | |
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152 | =item now |
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153 | |
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154 | Returns the current time as (fractional) seconds since the epoch. |
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155 | |
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156 | Using this expression does I<not> make your expression sensitive to time, |
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157 | but the next two functions do. |
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158 | |
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159 | =item again $seconds |
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160 | |
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161 | When this function is used the expression will be reevaluated again in |
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162 | C<$seconds> seconds. |
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163 | |
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164 | Example: load some image and rotate it according to the time of day (as if it were |
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165 | the hour pointer of a clock). update this image every minute. |
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166 | |
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167 | again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png" |
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168 | |
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169 | =item counter $seconds |
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170 | |
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171 | Like C<again>, but also returns an increasing counter value, starting at |
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172 | 0, which might be useful for some simple animation effects. |
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173 | |
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174 | =cut |
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175 | |
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176 | sub now() { urxvt::NOW } |
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177 | |
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178 | sub again($) { |
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179 | $new->{again} = $_[0]; |
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180 | } |
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181 | |
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182 | sub counter($) { |
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183 | $new->{again} = $_[0]; |
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184 | $self->{counter} + 0 |
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185 | } |
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186 | |
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187 | =back |
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188 | |
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189 | =head2 TILING MODES |
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190 | |
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191 | The following operators modify the tiling mode of an image, that is, the |
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192 | way that pixels outside the image area are painted when the image is used. |
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193 | |
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194 | =over 4 |
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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 | |
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230 | pad load "mybg.png" |
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231 | |
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232 | =item extend $img |
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233 | |
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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 |
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236 | filtering operations and want the pixels outside the image to have the |
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237 | same values as the pixels near the edge. |
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238 | |
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239 | Example: just for curiosity, how does this pixel extension stuff work? |
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240 | |
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241 | extend move 50, 50, load "mybg.png" |
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242 | |
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243 | =cut |
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244 | |
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245 | sub pad($) { |
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246 | my $img = $_[0]->clone; |
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247 | $img->repeat_mode (urxvt::RepeatNone); |
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248 | $img |
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249 | } |
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250 | |
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251 | sub tile($) { |
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252 | my $img = $_[0]->clone; |
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253 | $img->repeat_mode (urxvt::RepeatNormal); |
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254 | $img |
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255 | } |
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256 | |
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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 | } |
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262 | |
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263 | sub extend($) { |
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264 | my $img = $_[0]->clone; |
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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 | |
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277 | =item clone $img |
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278 | |
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279 | Returns an exact copy of the image. |
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280 | |
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281 | =cut |
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282 | |
39 | # sub clone($) { |
283 | sub clone($) { |
40 | # $_[0]->clone |
284 | $_[0]->clone |
41 | # } |
285 | } |
42 | |
286 | |
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287 | =item clip $img |
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288 | |
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289 | =item clip $width, $height, $img |
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290 | |
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291 | =item clip $x, $y, $width, $height, $img |
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292 | |
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293 | Clips an image to the given rectangle. If the rectangle is outside the |
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294 | image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is |
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295 | larger than the image, then the tiling mode defines how the extra pixels |
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296 | will be filled. |
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297 | |
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298 | If C<$x> an C<$y> are missing, then C<0> is assumed for both. |
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299 | |
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300 | If C<$width> and C<$height> are missing, then the window size will be |
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301 | assumed. |
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302 | |
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303 | Example: load an image, blur it, and clip it to the window size to save |
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304 | memory. |
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305 | |
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306 | clip blur 10, load "mybg.png" |
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307 | |
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308 | =cut |
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309 | |
43 | sub clip($$$$$;$) { |
310 | sub clip($;$$;$$) { |
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311 | my $img = pop; |
44 | my $img = pop; |
312 | my $h = pop || TH; |
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313 | my $w = pop || TW; |
45 | $img->sub_rect ($_[0], $_[1], $_[2], $_[3], $_[4]) |
314 | $img->sub_rect ($_[0], $_[1], $w, $h) |
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315 | } |
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316 | |
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317 | =item scale $img |
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318 | |
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319 | =item scale $size_percent, $img |
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320 | |
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321 | =item scale $width_percent, $height_percent, $img |
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322 | |
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323 | Scales the image by the given percentages in horizontal |
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324 | (C<$width_percent>) and vertical (C<$height_percent>) direction. |
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325 | |
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326 | If only one percentage is give, it is used for both directions. |
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327 | |
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328 | If no percentages are given, scales the image to the window size without |
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329 | keeping aspect. |
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330 | |
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331 | =item resize $width, $height, $img |
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332 | |
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333 | Resizes the image to exactly C<$width> times C<$height> pixels. |
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334 | |
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335 | =cut |
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336 | |
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337 | #TODO: maximise, maximise_fill? |
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338 | |
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339 | sub scale($;$;$) { |
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340 | my $img = pop; |
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341 | |
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342 | @_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01) |
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343 | : @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01) |
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344 | : $img->scale (TW, TH) |
46 | } |
345 | } |
47 | |
346 | |
48 | sub resize($$$) { |
347 | sub resize($$$) { |
49 | my $img = pop; |
348 | my $img = pop; |
50 | $img->scale ($_[0], $_[1]) |
349 | $img->scale ($_[0], $_[1]) |
51 | } |
350 | } |
52 | |
351 | |
53 | # TODO: ugly |
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54 | sub move($$;$) { |
352 | sub move($$;$) { |
55 | my $img = pop; |
353 | my $img = pop->clone; |
56 | $img->sub_rect ( |
354 | $img->move ($_[0], $_[1]); |
57 | $_[0], $_[1], |
355 | $img |
58 | $img->w, $img->h, |
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59 | $_[2], |
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60 | ) |
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61 | } |
356 | } |
62 | |
357 | |
63 | sub rotate($$$$$$;$) { |
358 | sub rotate($$$$$$) { |
64 | my $img = pop; |
359 | my $img = pop; |
65 | $img->rotate ( |
360 | $img->rotate ( |
66 | $_[0], |
361 | $_[0], |
67 | $_[1], |
362 | $_[1], |
68 | $_[2] * $img->w * .01, |
363 | $_[2] * $img->w * .01, |
69 | $_[3] * $img->h * .01, |
364 | $_[3] * $img->h * .01, |
70 | $_[4] * (3.14159265 / 180), |
365 | $_[4] * (3.14159265 / 180), |
71 | $_[5], |
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72 | ) |
366 | ) |
73 | } |
367 | } |
74 | |
368 | |
75 | sub blur($$$) { |
369 | sub blur($$;$) { |
76 | my ($rh, $rv, $img) = @_; |
370 | my $img = pop; |
77 | |
371 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
78 | $img->blur ($rh, $rv); |
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79 | } |
372 | } |
80 | |
373 | |
81 | sub contrast($$;$$;$) { |
374 | sub contrast($$;$$;$) { |
82 | my $img = pop; |
375 | my $img = pop; |
83 | my ($r, $g, $b, $a) = @_; |
376 | my ($r, $g, $b, $a) = @_; |
… | |
… | |
100 | $img = $img->clone; |
393 | $img = $img->clone; |
101 | $img->brightness ($r, $g, $b, $a); |
394 | $img->brightness ($r, $g, $b, $a); |
102 | $img |
395 | $img |
103 | } |
396 | } |
104 | |
397 | |
105 | sub X() { $new->{position_sensitive} = 1; $l } |
398 | =back |
106 | sub Y() { $new->{position_sensitive} = 1; $t } |
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107 | sub W() { $new->{size_sensitive} = 1; $w } |
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108 | sub H() { $new->{size_sensitive} = 1; $h } |
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109 | |
399 | |
110 | sub now() { urxvt::NOW } |
400 | =cut |
111 | |
401 | |
112 | sub again($) { |
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113 | $new->{again} = $_[0]; |
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114 | } |
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115 | |
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116 | sub counter($) { |
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117 | $new->{again} = $_[0]; |
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118 | $bgdsl_self->{counter} + 0 |
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119 | } |
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120 | } |
402 | } |
121 | |
403 | |
122 | sub parse_expr { |
404 | sub parse_expr { |
123 | my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}"; |
405 | my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}"; |
124 | die if $@; |
406 | die if $@; |
… | |
… | |
133 | $self->recalculate; |
415 | $self->recalculate; |
134 | } |
416 | } |
135 | |
417 | |
136 | # evaluate the current bg expression |
418 | # evaluate the current bg expression |
137 | sub recalculate { |
419 | sub recalculate { |
138 | my ($self) = @_; |
420 | my ($arg_self) = @_; |
139 | |
421 | |
140 | # rate limit evaluation |
422 | # rate limit evaluation |
141 | |
423 | |
142 | if ($self->{next_refresh} > urxvt::NOW) { |
424 | if ($arg_self->{next_refresh} > urxvt::NOW) { |
143 | $self->{next_refresh_timer} = urxvt::timer->new->after ($self->{next_refresh} - urxvt::NOW)->cb (sub { |
425 | $arg_self->{next_refresh_timer} = urxvt::timer->new->after ($arg_self->{next_refresh} - urxvt::NOW)->cb (sub { |
144 | $self->recalculate; |
426 | $arg_self->recalculate; |
145 | }); |
427 | }); |
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428 | return; |
146 | } |
429 | } |
147 | |
430 | |
148 | $self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
431 | $arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
149 | |
432 | |
150 | # set environment to evaluate user expression |
433 | # set environment to evaluate user expression |
151 | |
434 | |
152 | local $bgdsl_self = $self; |
435 | local $self = $arg_self; |
153 | |
436 | |
154 | local $old = $self->{state}; |
437 | local $old = $self->{state}; |
155 | local $new = my $state = $self->{state} = {}; |
438 | local $new = my $state = $self->{state} = {}; |
156 | |
439 | |
157 | ($l, $t, $w, $h) = |
440 | ($x, $y, $w, $h) = |
158 | $self->get_geometry; |
441 | $self->background_geometry ($self->{border}); |
159 | |
442 | |
160 | # evaluate user expression |
443 | # evaluate user expression |
161 | |
444 | |
162 | my $img = eval { $self->{expr}->() }; |
445 | my $img = eval { $self->{expr}->() }; |
163 | warn $@ if $@;#d# |
446 | warn $@ if $@;#d# |
|
|
447 | die if !UNIVERSAL::isa $img, "urxvt::img"; |
|
|
448 | |
|
|
449 | $state->{size_sensitive} = 1 |
|
|
450 | if $img->repeat_mode != urxvt::RepeatNormal; |
164 | |
451 | |
165 | # if the expression is sensitive to external events, prepare reevaluation then |
452 | # if the expression is sensitive to external events, prepare reevaluation then |
166 | |
453 | |
167 | my $repeat; |
454 | my $repeat; |
168 | |
455 | |
169 | if (my $again = $state->{again}) { |
456 | if (my $again = $state->{again}) { |
170 | $repeat = 1; |
457 | $repeat = 1; |
|
|
458 | my $self = $self; |
171 | $state->{timer} = $again == $old->{again} |
459 | $state->{timer} = $again == $old->{again} |
172 | ? $old->{timer} |
460 | ? $old->{timer} |
173 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
461 | : urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
174 | ++$self->{counter}; |
462 | ++$self->{counter}; |
175 | $self->recalculate |
463 | $self->recalculate |
… | |
… | |
204 | unless ($repeat) { |
492 | unless ($repeat) { |
205 | delete $self->{state}; |
493 | delete $self->{state}; |
206 | delete $self->{expr}; |
494 | delete $self->{expr}; |
207 | } |
495 | } |
208 | |
496 | |
209 | # prepare and set background pixmap |
497 | # set background pixmap |
210 | |
498 | |
211 | $img = $img->sub_rect (0, 0, $w, $h) |
|
|
212 | if $img->w != $w || $img->h != $h; |
|
|
213 | |
|
|
214 | $self->set_background ($img); |
499 | $self->set_background ($img, $self->{border}); |
215 | $self->scr_recolour (0); |
500 | $self->scr_recolour (0); |
216 | $self->want_refresh; |
501 | $self->want_refresh; |
217 | } |
502 | } |
218 | |
503 | |
219 | sub on_start { |
504 | sub on_start { |
220 | my ($self) = @_; |
505 | my ($self) = @_; |
221 | |
506 | |
|
|
507 | my $expr = $self->x_resource ("background.expr") |
|
|
508 | or return; |
|
|
509 | |
222 | $self->set_expr (parse_expr $EXPR); |
510 | $self->set_expr (parse_expr $expr); |
|
|
511 | $self->{border} = $self->x_resource_boolean ("background.border"); |
223 | |
512 | |
224 | () |
513 | () |
225 | } |
514 | } |
226 | |
515 | |