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5.9.163 (2012-06-05)

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- Method getGDgamma() was changed.
- Rendering performances of PNG images with alpha channel were improved.
This commit is contained in:
nicolaasuni 2012-06-05 18:40:09 +01:00
parent dc7dfc0ed9
commit 5bfef5c8cf
3 changed files with 37 additions and 14 deletions
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4
CHANGELOG.TXT
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@ -1,3 +1,7 @@
5.9.163 (2012-06-05)
- Method getGDgamma() was changed.
- Rendering performances of PNG images with alpha channel were improved.
5.9.162 (2012-05-11)
- A bug related to long text on TD cells was fixed.

4
README.TXT
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@ -8,8 +8,8 @@ http://sourceforge.net/donate/index.php?group_id=128076
------------------------------------------------------------
Name: TCPDF
Version: 5.9.162
Release date: 2012-05-11
Version: 5.9.163
Release date: 2012-06-05
Author: Nicola Asuni
Copyright (c) 2002-2012:

43
tcpdf.php
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@ -1,9 +1,9 @@
<?php
//============================================================+
// File name : tcpdf.php
// Version : 5.9.162
// Version : 5.9.163
// Begin : 2002-08-03
// Last Update : 2012-05-11
// Last Update : 2012-06-05
// Author : Nicola Asuni - Tecnick.com LTD - Manor Coach House, Church Hill, Aldershot, Hants, GU12 4RQ, UK - www.tecnick.com - info@tecnick.com
// License : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3
// -------------------------------------------------------------------
@ -137,7 +137,7 @@
* Tools to encode your unicode fonts are on fonts/utils directory.</p>
* @package com.tecnick.tcpdf
* @author Nicola Asuni
* @version 5.9.162
* @version 5.9.163
*/
// Main configuration file. Define the K_TCPDF_EXTERNAL_CONFIG constant to skip this file.
@ -149,7 +149,7 @@ require_once(dirname(__FILE__).'/config/tcpdf_config.php');
* TCPDF project (http://www.tcpdf.org) has been originally derived in 2002 from the Public Domain FPDF class by Olivier Plathey (http://www.fpdf.org), but now is almost entirely rewritten.<br>
* @package com.tecnick.tcpdf
* @brief PHP class for generating PDF documents without requiring external extensions.
* @version 5.9.162
* @version 5.9.163
* @author Nicola Asuni - info@tecnick.com
*/
class TCPDF {
@ -160,7 +160,7 @@ class TCPDF {
* Current TCPDF version.
* @private
*/
private $tcpdf_version = '5.9.162';
private $tcpdf_version = '5.9.163';
// Protected properties
@ -1879,6 +1879,13 @@ class TCPDF {
*/
protected $tcpdflink = true;
/**
* Cache array for computed GD gamma values.
* @protected
* @since 5.9.1632 (2012-06-05)
*/
protected $gdgammacache = array();
//------------------------------------------------------------
// METHODS
//------------------------------------------------------------
@ -8435,9 +8442,7 @@ class TCPDF {
for ($xpx = 0; $xpx < $wpx; ++$xpx) {
for ($ypx = 0; $ypx < $hpx; ++$ypx) {
$color = imagecolorat($img, $xpx, $ypx);
$alpha = ($color >> 24); // shifts off the first 24 bits (where 8x3 are used for each color), and returns the remaining 7 allocated bits (commonly used for alpha)
$alpha = (((127 - $alpha) / 127) * 255); // GD alpha is only 7 bit (0 -> 127)
$alpha = $this->getGDgamma($alpha); // correct gamma
$alpha = $this->getGDgamma($color); // correct gamma
imagesetpixel($imgalpha, $xpx, $ypx, $alpha);
}
}
@ -8461,13 +8466,27 @@ class TCPDF {
}
/**
* Correct the gamma value to be used with GD library
* @param $v (float) the gamma value to be corrected
* Get the GD-corrected PNG gamma value from alpha color
* @param $c (int) alpha color
* @protected
* @since 4.3.007 (2008-12-04)
*/
protected function getGDgamma($v) {
return (pow(($v / 255), 2.2) * 255);
protected function getGDgamma($c) {
if (!isset($this->gdgammacache[$c])) {
// shifts off the first 24 bits (where 8x3 are used for each color),
// and returns the remaining 7 allocated bits (commonly used for alpha)
$alpha = ($c >> 24);
// GD alpha is only 7 bit (0 -> 127)
$alpha = (((127 - $alpha) / 127) * 255);
// correct gamma
$this->gdgammacache[$c] = (pow(($alpha / 255), 2.2) * 255);
// store the latest values on cache to improve performances
if (count($this->gdgammacache) > 8) {
// remove one element from the cache array
array_shift($this->gdgammacache);
}
}
return $this->gdgammacache[$c];
}
/**