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Diffstat (limited to 'include/derivative_params.inc.php')
| -rw-r--r-- | include/derivative_params.inc.php | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/include/derivative_params.inc.php b/include/derivative_params.inc.php new file mode 100644 index 000000000..9fe76cd43 --- /dev/null +++ b/include/derivative_params.inc.php @@ -0,0 +1,315 @@ +<?php +// +-----------------------------------------------------------------------+ +// | Piwigo - a PHP based photo gallery | +// +-----------------------------------------------------------------------+ +// | Copyright(C) 2008-2012 Piwigo Team http://piwigo.org | +// +-----------------------------------------------------------------------+ +// | This program is free software; you can redistribute it and/or modify | +// | it under the terms of the GNU General Public License as published by | +// | the Free Software Foundation | +// | | +// | This program is distributed in the hope that it will be useful, but | +// | WITHOUT ANY WARRANTY; without even the implied warranty of | +// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | +// | General Public License for more details. | +// | | +// | You should have received a copy of the GNU General Public License | +// | along with this program; if not, write to the Free Software | +// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | +// | USA. | +// +-----------------------------------------------------------------------+ + +function size_to_url($s) +{ + if ($s[0]==$s[1]) + { + return $s[0]; + } + return $s[0].'x'.$s[1]; +} + +function url_to_size($s) +{ + $pos = strpos($s, 'x'); + if ($pos===false) + { + return array((int)$s, (int)$s); + } + return array((int)substr($s,0,$pos), (int)substr($s,$pos+1)); +} + +function size_equals($s1, $s2) +{ + return ($s1[0]==$s2[0] && $s1[1]==$s2[1]); +} + + +/** small utility to manipulate a 'rectangle'*/ +final class ImageRect +{ + public $l,$t,$r,$b; + + function __construct($l) + { + $this->l = $this->t = 0; + $this->r = $l[0]; + $this->b = $l[1]; + } + + function width() + { + return $this->r - $this->l; + } + + function height() + { + return $this->b - $this->t; + } + + function crop_h($pixels, $coi, $force) + { + if ($this->width() <= $pixels) + return; + $tlcrop = floor($pixels/2); + + if (!empty($coi)) + { + $coil = floor($this->r * (ord($coi[0]) - ord('a'))/25); + $coir = ceil($this->r * (ord($coi[2]) - ord('a'))/25); + $availableL = $coil > $this->l ? $coil - $this->l : 0; + $availableR = $coir < $this->r ? $this->r - $coir : 0; + if ($availableL + $availableR <= $pixels) + { + if (!$force) + { + $pixels = $availableL + $availableR; + $tlcrop = $availableL; + } + } + else + { + if ($availableL < $tlcrop) + { + $tlcrop = $availableL; + } + elseif ($availableR < $tlcrop) + { + $tlcrop = $pixels - $availableR; + } + } + } + $this->l += $tlcrop; + $this->r -= $pixels - $tlcrop; + } + + function crop_v($pixels, $coi, $force) + { + if ($this->height() <= $pixels) + return; + $tlcrop = floor($pixels/2); + + if (!empty($coi)) + { + $coit = floor($this->b * (ord($coi[1]) - ord('a'))/25); + $coib = ceil($this->b * (ord($coi[3]) - ord('a'))/25); + $availableT = $coit > $this->t ? $coit - $this->t : 0; + $availableB = $coib < $this->b ? $this->b - $coib : 0; + if ($availableT + $availableB <= $pixels) + { + if (!$force) + { + $pixels = $availableT + $availableB; + $tlcrop = $availableT; + } + } + else + { + if ($availableT < $tlcrop) + { + $tlcrop = $availableT; + } + elseif ($availableB < $tlcrop) + { + $tlcrop = $pixels - $availableB; + } + } + } + $this->t += $tlcrop; + $this->b -= $pixels - $tlcrop; + } + +} + + +/*how we crop and/or resize an image*/ +final class SizingParams +{ + function __construct($ideal_size, $max_crop = 0, $min_size = null) + { + $this->ideal_size = $ideal_size; + $this->max_crop = $max_crop; + $this->min_size = $min_size; + } + + static function classic($w, $h) + { + return new SizingParams( array($w,$h) ); + } + + static function square($w) + { + return new SizingParams( array($w,$w), 1, array($w,$w) ); + } + + function add_url_tokens(&$tokens) + { + if ($this->max_crop == 0) + { + $tokens[] = 's'.size_to_url($this->ideal_size); + } + elseif ($this->max_crop == 1 && size_equals($this->ideal_size, $this->min_size) ) + { + $tokens[] = 'e'.size_to_url($this->ideal_size); + } + else + { + $tokens[] = size_to_url($this->ideal_size); + $tokens[] = sprintf('%02x', round(100*$this->max_crop) ); + $tokens[] = size_to_url($this->min_size); + } + } + + static function from_url_tokens($tokens) + { + if (count($tokens)<1) + throw new Exception('Empty array while parsing Sizing'); + $token = array_shift($tokens); + if ($token[0]=='s') + { + return new SizingParams( url_to_size( substr($token,1) ) ); + } + if ($token[0]=='e') + { + $s = url_to_size( substr($token,1) ); + return new SizingParams($s, 1, $s); + } + + $ideal_size = url_to_size( $token ); + if (count($tokens)<2) + throw new Exception('Sizing arr'); + + $token = array_shift($tokens); + $crop = sscanf('%02x' , $token) / 100; + + $token = array_shift($tokens); + $min_size = url_to_size( $token ); + return new SizingParams($ideal_size, $crop, $min_size); + } + + + function compute($in_size, $coi, &$crop_rect, &$scale_size) + { + $destCrop = new ImageRect($in_size); + + if ($this->max_crop > 0) + { + $ratio_w = $destCrop->width() / $this->ideal_size[0]; + $ratio_h = $destCrop->height() / $this->ideal_size[1]; + if ($ratio_w>1 || $ratio_h>1) + { + if ($ratio_w > $ratio_h) + { + $h = $destCrop->height() / $ratio_w; + if ($h < $this->min_size[1]) + { + $idealCropPx = $destCrop->width() - round($destCrop->height() * $this->ideal_size[0] / $this->min_size[1], 0); + $maxCropPx = round($this->max_crop * $destCrop->width()); + $destCrop->crop_h( min($idealCropPx, $maxCropPx), $coi, false); + } + } + else + { + $w = $destCrop->width() / $ratio_h; + if ($w < $this->min_size[0]) + { + $idealCropPx = $destCrop->height() - round($destCrop->width() * $this->ideal_size[1] / $this->min_size[0], 0); + $maxCropPx = round($this->max_crop * $destCrop->height()); + $destCrop->crop_v( min($idealCropPx, $maxCropPx), $coi, false); + } + } + } + } + + $scale_size = array($destCrop->width(), $destCrop->height()); + + $ratio_w = $destCrop->width() / $this->ideal_size[0]; + $ratio_h = $destCrop->height() / $this->ideal_size[1]; + if ($ratio_w>1 || $ratio_h>1) + { + if ($ratio_w > $ratio_h) + { + $scale_size[0] = $this->ideal_size[0]; + $scale_size[1] = floor($scale_size[1] / $ratio_w); + } + else + { + $scale_size[0] = floor($scale_size[0] / $ratio_h); + $scale_size[1] = $this->ideal_size[1]; + } + } + else + { + $scale_size = null; + } + + $crop_rect = null; + if ($destCrop->width()!=$in_size[0] || $destCrop->height()!=$in_size[1] ) + { + $crop_rect = $destCrop; + } + } + +} + + +/*how we generate a derivative image*/ +final class ImageParams +{ + public $type = IMG_CUSTOM; + public $last_mod_time = 0; // used for non-custom images to regenerate the cached files + public $sizing; + + function __construct($sizing) + { + $this->sizing = $sizing; + } + + function add_url_tokens(&$tokens) + { + $this->sizing->add_url_tokens($tokens); + } + + static function from_url_tokens($tokens) + { + $sizing = SizingParams::from_url_tokens($tokens); + $ret = new ImageParams($sizing); + return $ret; + } + + function compute_final_size($in_size, $coi) + { + $this->sizing->compute( $in_size, $coi, $crop_rect, $scale_size ); + return $scale_size != null ? $scale_size : $in_size; + } + + function is_identity($in_size) + { + if ($in_size[0] > $this->sizing->ideal_size[0] or + $in_size[1] > $this->sizing->ideal_size[1] ) + { + return false; + } + return true; + } +} +?>
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