' . "\n";
$skipCache = false; // DEBUG
if ($skipCache ||
!file_exists($cacheFileName) ||
filemtime($fileName) > filemtime($cacheFileName))
{
// Cache file is outdated, recreate the data
$ystep = 5;
$yextra = $hspace / 2;
$leftSide = $side == 'left';
#$t0 = microtime(true);
$im = imagecreatefrompng($fileName);
$divs = array();
$prevDiv = null;
// For each block ow rows (group of $ystep rows)
for ($basey = 0; $basey < $height; $basey += $ystep)
{
// Find the farest X position of transparency in all rows of this group
$rowx = $leftSide ? 0 : $width - 1;
for ($y = max(0, $basey - $yextra); $y < $height && $y < $basey + $ystep - 1 + $yextra; $y++)
{
if ($leftSide)
{
// For each row in the group
for ($x = $width - 1; $x >= $rowx; $x--)
{
$color = imagecolorat($im, $x, $y);
#$alpha = ($color & 0x7F000000) >> 24; // Only for 32-bit colour images
$colors = imagecolorsforindex($im, $color);
$alpha = $colors['alpha'];
if ($alpha < 127) break; // 127 is the maximum transparency (PHP doesn't use opacity!)
}
$rowx = max($x, $rowx);
}
else
{
// For each row in the group
for ($x = 0; $x <= $rowx; $x++)
{
$color = imagecolorat($im, $x, $y);
#$alpha = ($color & 0x7F000000) >> 24; // Only for 32-bit colour images
$colors = imagecolorsforindex($im, $color);
$alpha = $colors['alpha'];
if ($alpha < 127) break; // 127 is the maximum transparency (PHP doesn't use opacity!)
}
$rowx = min($x, $rowx);
}
}
// Set the image shape div's size
$w = $leftSide ? $rowx : $width - 1 - $rowx;
if ($w > 0)
$w += $hspace;
$h = $ystep;
// Compare the current div's size with the previous'
if (isset($prevDiv) && abs($prevDiv[1] - $w) < 5)
{
// (Almost) same width, combine both divs in height to save HTML code
$lastIndex = count($divs) - 1;
$divs[$lastIndex][0] += $h;
$divs[$lastIndex][1] = max($divs[$lastIndex][1], $w);
}
else
{
// Different width, add new div
$prevDiv = array($h, $w);
$divs[] = $prevDiv;
}
}
#echo ' [' . round((microtime(true) - $t0) * 1000) . ' ms] ';
// Regard the top and bottom margin for the first and last block
$divs[0][0] += $top;
$divs[count($divs) - 1][0] += $bottom;
// Print out all divs
$cache = '';
foreach ($divs as $div)
{
// Insert top margin before the first spacer element
if (!strlen($cache) && $marginTop)
{
$cache .= '' . "\n";
}
list($h, $w) = $div;
$cache .= '' . "\n";
}
// Create cache directory and file
if (!is_dir(dirname($cacheFileName)))
mkdir(dirname($cacheFileName), 0777, true);
file_put_contents($cacheFileName, $cache);
// Print output
echo $cache;
}
else
{
// Print cached file
readfile($cacheFileName);
}
}
?>