122 lines
3.3 KiB
PHP
122 lines
3.3 KiB
PHP
<?php
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/**
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* This script generates a sprite from the unprocessed pagetool icons by combining them
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* and overlaying a color layer for the active state.
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*
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* This script requires a current libGD to be available.
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*
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* The color for the active state is read from the style.ini's __link__ replacement
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*
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* The final sprite is optimized with optipng if available.
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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* @todo Maybe add some more error checking
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*/
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$GAMMA = 0.8;
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$OPTIPNG = '/usr/bin/optipng';
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// load input images
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$input = glob('pagetools/*.png');
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sort($input);
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$cnt = count($input);
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if(!$cnt){
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die("No input images found. This script needs to be called from within the image directory!\n");
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}
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// create destination image
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$DST = imagecreatetruecolor(30,$cnt*45*2);
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imagesavealpha($DST, true);
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$C_trans = imagecolorallocatealpha($DST, 0, 0, 0, 127);
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imagefill($DST, 0, 0, $C_trans);
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// load highlight color from style.ini
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$ini = parse_ini_file('../style.ini',true);
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$COLOR = hex2rgb($ini['replacements']['__link__']);
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$C_active = imagecolorallocate($DST, $COLOR['r'],$COLOR['g'],$COLOR['b']);
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// add all the icons to the sprite image
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for($i=0; $i<$cnt; $i++){
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$base = $i*90;
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$IN = imagecreatefrompng($input[$i]);
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imagesavealpha($IN, true);
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imagecolorscale($IN,$GAMMA);
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imagecopy($DST,$IN, 0,$base, 0,0, 30,30);
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imagedestroy($IN);
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$IN = imagecreatefrompng($input[$i]);
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imagesavealpha($IN, true);
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imagecolorscale($IN,$GAMMA);
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imagecopy($DST,$IN, 0,$base+45, 0,0, 30,30);
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imagedestroy($IN);
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imagelayereffect($DST, IMG_EFFECT_OVERLAY);
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imagefilledrectangle($DST, 0,$base+45, 30,$base+45+30, $C_active);
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imagelayereffect($DST, IMG_EFFECT_NORMAL);
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}
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// output sprite
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imagepng($DST,'pagetools-sprite.png');
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imagedestroy($DST);
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// optimize if possible
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if(is_executable($OPTIPNG)){
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system("$OPTIPNG -o5 'pagetools-sprite.png'");
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}
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/**
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* Convert a hex color code to an rgb array
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*/
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function hex2rgb($hex) {
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// strip hash
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$hex = str_replace('#', '', $hex);
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// normalize short codes
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if(strlen($hex) == 3){
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$hex = substr($hex,0,1).
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substr($hex,0,1).
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substr($hex,1,1).
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substr($hex,1,1).
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substr($hex,2,1).
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substr($hex,2,1);
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}
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// calc rgb
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return array(
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'r' => hexdec(substr($hex, 0, 2)),
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'g' => hexdec(substr($hex, 2, 2)),
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'b' => hexdec(substr($hex, 4, 2))
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);
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}
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/**
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* Scale (darken/lighten) a given image
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*
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* @param ressource $img The truetype GD image to work on
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* @param float $scale Scale the colors by this value ( <1 darkens, >1 lightens)
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*/
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function imagecolorscale(&$img, $scale){
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$w = imagesx($img);
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$h = imagesy($img);
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imagealphablending($img, false);
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for($x = 0; $x < $w; $x++){
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for($y = 0; $y < $h; $y++){
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$rgba = imagecolorat($img, $x, $y);
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$a = ($rgba >> 24) & 0xFF;
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$r = ($rgba >> 16) & 0xFF;
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$g = ($rgba >> 8) & 0xFF;
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$b = $rgba & 0xFF;
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$r = max(min(round($r*$scale),255),0);
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$g = max(min(round($g*$scale),255),0);
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$b = max(min(round($b*$scale),255),0);
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$color = imagecolorallocatealpha($img, $r, $g, $b, $a);
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imagesetpixel($img, $x, $y, $color);
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}
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}
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imagealphablending($img, true);
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}
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