<?php
/**
* class.ico.php
*
* @(#) $Header: /home/jeph/repository/classes/ico/class.ico.php,v 0.1 2005/06/08 15:12:24 jeph Exp $
**/
/**
* Class Ico
* Open ICO files and extract any size/depth to PNG format
*
* @author Diogo Resende <me@diogoresende.net>
* @version 0.1
*
* @method public Ico($path = '')
* @method public LoadFile($path)
* @method private LoadData($data)
* @method public TotalIcons()
* @method public GetIconInfo($index)
* @method public GetIcon($index)
* @method private AllocateColor(&$im, $red, $green, $blue, $alpha = 0)
**/
class Ico {
/**
* Ico::bgcolor
* Background color on icon extraction
*
* @type array(R, G, B) = array(255, 255, 255)
* @var public
**/
var $bgcolor = array(255, 255, 255);
/**
* Ico::bgcolor_transparent
* Is background color transparent?
*
* @type boolean = false
* @var public
**/
var $bgcolor_transparent = false;
/**
* Ico::Ico()
* Class constructor
*
* @param optional string $path Path to ICO file
* @return void
**/
function Ico($path = '') {
if (strlen($path) > 0) {
$this->LoadFile($path);
}
}
/**
* Ico::LoadFile()
* Load an ICO file (don't need to call this is if fill the
* parameter in the class constructor)
*
* @param string $path Path to ICO file
* @return boolean Success
**/
function LoadFile($path) {
$this->_filename = $path;
if (($fp = @fopen($path, 'rb')) !== false) {
$data = '';
while (!feof($fp)) {
$data .= fread($fp, 4096);
}
fclose($fp);
return $this->LoadData($data);
}
return false;
}
/**
* Ico::LoadData()
* Load an ICO data. If you prefer to open the file
* and return the binary data you can use this function
* directly. Otherwise use LoadFile() instead.
*
* @param string $data Binary data of ICO file
* @return boolean Success
**/
function LoadData($data) {
$this->formats = array();
/**
* ICO header
**/
$icodata = unpack("SReserved/SType/SCount", $data);
$this->ico = $icodata;
$data = substr($data, 6);
/**
* Extract each icon header
**/
for ($i = 0; $i < $this->ico['Count']; $i ++) {
$icodata = unpack("CWidth/CHeight/CColorCount/CReserved/SPlanes/SBitCount/LSizeInBytes/LFileOffset", $data);
$icodata['FileOffset'] -= ($this->ico['Count'] * 16) + 6;
if ($icodata['ColorCount'] == 0) $icodata['ColorCount'] = 256;
$this->formats[] = $icodata;
$data = substr($data, 16);
}
/**
* Extract aditional headers for each extracted icon header
**/
for ($i = 0; $i < count($this->formats); $i++) {
$icodata = unpack("LSize/LWidth/LHeight/SPlanes/SBitCount/LCompression/LImageSize/LXpixelsPerM/LYpixelsPerM/LColorsUsed/LColorsImportant", substr($data, $this->formats[$i]['FileOffset']));
$this->formats[$i]['header'] = $icodata;
$this->formats[$i]['colors'] = array();
$this->formats[$i]['BitCount'] = $this->formats[$i]['header']['BitCount'];
switch ($this->formats[$i]['BitCount']) {
case 32:
case 24:
$length = $this->formats[$i]['header']['Width'] * $this->formats[$i]['header']['Height'] * ($this->formats[$i]['BitCount'] / 8);
$this->formats[$i]['data'] = substr($data, $this->formats[$i]['FileOffset'] + $this->formats[$i]['header']['Size'], $length);
break;
case 8:
case 4:
$icodata = substr($data, $this->formats[$i]['FileOffset'] + $icodata['Size'], $this->formats[$i]['ColorCount'] * 4);
$offset = 0;
for ($j = 0; $j < $this->formats[$i]['ColorCount']; $j++) {
$this->formats[$i]['colors'][] = array(
'red' => ord($icodata[$offset]),
'green' => ord($icodata[$offset + 1]),
'blue' => ord($icodata[$offset + 2]),
'reserved' => ord($icodata[$offset + 3])
);
$offset += 4;
}
$length = $this->formats[$i]['header']['Width'] * $this->formats[$i]['header']['Height'] * (1 + $this->formats[$i]['BitCount']) / $this->formats[$i]['BitCount'];
$this->formats[$i]['data'] = substr($data, $this->formats[$i]['FileOffset'] + ($this->formats[$i]['ColorCount'] * 4) + $this->formats[$i]['header']['Size'], $length);
break;
case 1:
$icodata = substr($data, $this->formats[$i]['FileOffset'] + $icodata['Size'], $this->formats[$i]['ColorCount'] * 4);
$this->formats[$i]['colors'][] = array(
'blue' => ord($icodata[0]),
'green' => ord($icodata[1]),
'red' => ord($icodata[2]),
'reserved' => ord($icodata[3])
);
$this->formats[$i]['colors'][] = array(
'blue' => ord($icodata[4]),
'green' => ord($icodata[5]),
'red' => ord($icodata[6]),
'reserved' => ord($icodata[7])
);
$length = $this->formats[$i]['header']['Width'] * $this->formats[$i]['header']['Height'] / 8;
$this->formats[$i]['data'] = substr($data, $this->formats[$i]['FileOffset'] + $this->formats[$i]['header']['Size'] + 8, $length);
break;
}
$this->formats[$i]['data_length'] = strlen($this->formats[$i]['data']);
}
return true;
}
/**
* Ico::TotalIcons()
* Return the total icons extracted at the moment
*
* @return integer Total icons
**/
function TotalIcons() {
return count($this->formats);
}
/**
* Ico::GetIconInfo()
* Return the icon header corresponding to that index
*
* @param integer $index Icon index
* @return resource Icon header
**/
function GetIconInfo($index) {
if (isset($this->formats[$index])) {
return $this->formats[$index];
}
return false;
}
/**
* Ico::SetBackground()
* Changes background color of extraction. You can set
* the 3 color components or set $red = '#xxxxxx' (HTML format)
* and leave all other blanks.
*
* @param optional integer $red Red component
* @param optional integer $green Green component
* @param optional integer $blue Blue component
* @return void
**/
function SetBackground($red = 255, $green = 255, $blue = 255) {
if (is_string($red) && preg_match('/^\#[0-9a-f]{6}$/', $red)) {
$green = hexdec($red[3] . $red[4]);
$blue = hexdec($red[5] . $red[6]);
$red = hexdec($red[1] . $red[2]);
}
$this->bgcolor = array($red, $green, $blue);
}
/**
* Ico::SetBackgroundTransparent()
* Set background color to be saved as transparent
*
* @param optional boolean $is_transparent Is Transparent or not
* @return boolean Is Transparent or not
**/
function SetBackgroundTransparent($is_transparent = true) {
return ($this->bgcolor_transparent = $is_transparent);
}
/**
* Ico::GetImage()
* Return an image resource with the icon stored
* on the $index position of the ICO file
*
* @param integer $index Position of the icon inside ICO
* @return resource Image resource
**/
function &GetIcon($index) {
if (!isset($this->formats[$index])) {
return false;
}
/**
* create image
**/
$im = imagecreatetruecolor($this->formats[$index]['Width'], $this->formats[$index]['Height']);
/**
* paint background
**/
$bgcolor = $this->AllocateColor($im, $this->bgcolor[0], $this->bgcolor[1], $this->bgcolor[2]);
imagefilledrectangle($im, 0 , 0, $this->formats[$index]['Width'], $this->formats[$index]['Height'], $bgcolor);
/**
* set background color transparent
**/
if ($this->bgcolor_transparent) {
imagecolortransparent($im, $bgcolor);
}
/**
* allocate pallete and get XOR image
**/
if (in_array($this->formats[$index]['BitCount'], array(1, 4, 8, 24))) {
if ($this->formats[$index]['BitCount'] != 24) {
/**
* color pallete
**/
$c = array();
for ($i = 0; $i < $this->formats[$index]['ColorCount']; $i++) {
$c[$i] = $this->AllocateColor($im, $this->formats[$index]['colors'][$i]['red'],
$this->formats[$index]['colors'][$i]['green'],
$this->formats[$index]['colors'][$i]['blue'],
round($this->formats[$index]['colors'][$i]['reserved'] / 255 * 127));
}
}
/**
* XOR image
**/
$width = $this->formats[$index]['Width'];
if (($width % 32) > 0) {
$width += (32 - ($this->formats[$index]['Width'] % 32));
}
$offset = $this->formats[$index]['Width'] * $this->formats[$index]['Height'] * $this->formats[$index]['BitCount'] / 8;
$total_bytes = ($width * $this->formats[$index]['Height']) / 8;
$bits = '';
$bytes = 0;
$bytes_per_line = ($this->formats[$index]['Width'] / 8);
$bytes_to_remove = (($width - $this->formats[$index]['Width']) / 8);
for ($i = 0; $i < $total_bytes; $i++) {
$bits .= str_pad(decbin(ord($this->formats[$index]['data'][$offset + $i])), 8, '0', STR_PAD_LEFT);
$bytes++;
if ($bytes == $bytes_per_line) {
$i += $bytes_to_remove;
$bytes = 0;
}
}
}
/**
* paint each pixel depending on bit count
**/
switch ($this->formats[$index]['BitCount']) {
case 32:
/**
* 32 bits: 4 bytes per pixel [ B | G | R | ALPHA ]
**/
$offset = 0;
for ($i = $this->formats[$index]['Height'] - 1; $i >= 0; $i--) {
for ($j = 0; $j < $this->formats[$index]['Width']; $j++) {
$color = substr($this->formats[$index]['data'], $offset, 4);
if (ord($color[3]) > 0) {
$c = $this->AllocateColor($im, ord($color[2]),
ord($color[1]),
ord($color[0]),
127 - round(ord($color[3]) / 255 * 127));
imagesetpixel($im, $j, $i, $c);
}
$offset += 4;
}
}
break;
case 24:
/**
* 24 bits: 3 bytes per pixel [ B | G | R ]
**/
$offset = 0;
$bitoffset = 0;
for ($i = $this->formats[$index]['Height'] - 1; $i >= 0; $i--) {
for ($j = 0; $j < $this->formats[$index]['Width']; $j++) {
if ($bits[$bitoffset] == 0) {
$color = substr($this->formats[$index]['data'], $offset, 3);
$c = $this->AllocateColor($im, ord($color[2]), ord($color[1]), ord($color[0]));
imagesetpixel($im, $j, $i, $c);
}
$offset += 3;
$bitoffset++;
}
}
break;
case 8:
/**
* 8 bits: 1 byte per pixel [ COLOR INDEX ]
**/
$offset = 0;
for ($i = $this->formats[$index]['Height'] - 1; $i >= 0; $i--) {
for ($j = 0; $j < $this->formats[$index]['Width']; $j++) {
if ($bits[$offset] == 0) {
$color = ord(substr($this->formats[$index]['data'], $offset, 1));
imagesetpixel($im, $j, $i, $c[$color]);
}
$offset++;
}
}
break;
case 4:
/**
* 4 bits: half byte/nibble per pixel [ COLOR INDEX ]
**/
$offset = 0;
$maskoffset = 0;
$leftbits = true;
for ($i = $this->formats[$index]['Height'] - 1; $i >= 0; $i--) {
for ($j = 0; $j < $this->formats[$index]['Width']; $j++) {
if ($leftbits) {
$color = substr($this->formats[$index]['data'], $offset, 1);
$color = array(
'High' => bindec(substr(decbin(ord($color)), 0, 4)),
'Low' => bindec(substr(decbin(ord($color)), 4))
);
if ($bits[$maskoffset++] == 0) {
imagesetpixel($im, $j, $i, $c[$color['High']]);
}
$leftbits = false;
} else {
if ($bits[$maskoffset++] == 0) {
imagesetpixel($im, $j, $i, $c[$color['Low']]);
}
$offset++;
$leftbits = true;
}
}
}
break;
case 1:
/**
* 1 bit: 1 bit per pixel (2 colors, usually black&white) [ COLOR INDEX ]
**/
$colorbits = '';
$total = strlen($this->formats[$index]['data']);
for ($i = 0; $i < $total; $i++) {
$colorbits .= str_pad(decbin(ord($this->formats[$index]['data'][$i])), 8, '0', STR_PAD_LEFT);
}
$total = strlen($colorbits);
$offset = 0;
for ($i = $this->formats[$index]['Height'] - 1; $i >= 0; $i--) {
for ($j = 0; $j < $this->formats[$index]['Width']; $j++) {
if ($bits[$offset] == 0) {
imagesetpixel($im, $j, $i, $c[$colorbits[$offset]]);
}
$offset++;
}
}
break;
}
return $im;
}
/**
* Ico::AllocateColor()
* Allocate a color on $im resource. This function prevents
* from allocating same colors on the same pallete. Instead
* if it finds that the color is already allocated, it only
* returns the index to that color.
* It supports alpha channel.
*
* @param resource $im Image resource
* @param integer $red Red component
* @param integer $green Green component
* @param integer $blue Blue component
* @param optional integer $alphpa Alpha channel
* @return integer Color index
**/
function AllocateColor(&$im, $red, $green, $blue, $alpha = 0) {
$c = imagecolorexactalpha($im, $red, $green, $blue, $alpha);
if ($c >= 0) {
return $c;
}
return imagecolorallocatealpha($im, $red, $green, $blue, $alpha);
}
}
?>
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