fpdf/gif.php
<?php
///////////////////////////////////////////////////////////////////////////////////////////////////
// GIF Util - (C) 2003 Yamasoft (S/C)
// http://www.yamasoft.com
// All Rights Reserved
// This file can be frelly copied, distributed, modified, updated by anyone under the only
// condition to leave the original address (Yamasoft, http://www.yamasoft.com) and this header.
///////////////////////////////////////////////////////////////////////////////////////////////////
// <gif> = gif_loadFile(filename, [index])
// <bool> = gif_getSize(<gif> or filename, &width, &height)
// <bool> = gif_outputAsPng(<gif>, filename, [bgColor])
// <bool> = gif_outputAsBmp(<gif>, filename, [bgcolor])
// <bool> = gif_outputAsJpeg(<gif>, filename, [bgcolor]) - Requires cjpeg
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
if (!defined('XOOPS_ROOT_PATH')) {
die('XOOPS root path not defined');
}
function gif_loadFile($lpszFileName, $iIndex = 0)
{
$gif = new CGIF();
if(!$gif->loadFile($lpszFileName, $iIndex)) {
return false;
}
return $gif;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
function gif_outputAsBmp($gif, $lpszFileName, $bgColor = -1)
{
if(!isSet($gif) || (@get_class($gif) <> 'cgif') || !$gif->loaded() || ($lpszFileName == '')) {
return false;
}
$fd = $gif->getBmp($bgColor);
if(strlen($fd) <= 0) {
return false;
}
if(!($fh = @fOpen($lpszFileName, 'wb'))) {
return false;
}
@fWrite($fh, $fd, strlen($fd));
@fFlush($fh);
@fClose($fh);
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
function gif_outputAsPng($gif, $lpszFileName, $bgColor = -1)
{
if(!isSet($gif) || (@get_class($gif) <> 'cgif') || !$gif->loaded() || ($lpszFileName == '')) {
return false;
}
$fd = $gif->getPng($bgColor);
if(strlen($fd) <= 0) {
return false;
}
if(!($fh = @fOpen($lpszFileName, 'wb'))) {
return false;
}
@fWrite($fh, $fd, strlen($fd));
@fFlush($fh);
@fClose($fh);
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
function gif_outputAsJpeg($gif, $lpszFileName, $bgColor = -1)
{
if(gif_outputAsBmp($gif, "$lpszFileName.bmp", $gbColor)) {
exec("cjpeg $lpszFileName.bmp >$lpszFileName 2>/dev/null");
@unLink("$lpszFileName.bmp");
if(@file_exists($lpszFileName)) {
if(@fileSize($lpszFileName) > 0) {
return true;
}
@unLink($lpszFileName);
}
}
return false;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
function gif_getSize($gif, &$width, &$height)
{
if(isSet($gif) && (@get_class($gif) == 'cgif') && $gif->loaded()) {
$width = $gif->width();
$height = $gif->height();
}
else if(@file_exists($gif)) {
$myGIF = new CGIF();
if(!$myGIF->getSize($gif, $width, $height)) {
return false;
}
}
else {
return false;
}
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
class CGIFLZW
{
var $MAX_LZW_BITS;
var $Fresh, $CodeSize, $SetCodeSize, $MaxCode, $MaxCodeSize, $FirstCode, $OldCode;
var $ClearCode, $EndCode, $Next, $Vals, $Stack, $sp, $Buf, $CurBit, $LastBit, $Done, $LastByte;
///////////////////////////////////////////////////////////////////////////
// CONSTRUCTOR
function CGIFLZW()
{
$this->MAX_LZW_BITS = 12;
unSet($this->Next);
unSet($this->Vals);
unSet($this->Stack);
unSet($this->Buf);
$this->Next = range(0, (1 << $this->MAX_LZW_BITS) - 1);
$this->Vals = range(0, (1 << $this->MAX_LZW_BITS) - 1);
$this->Stack = range(0, (1 << ($this->MAX_LZW_BITS + 1)) - 1);
$this->Buf = range(0, 279);
}
///////////////////////////////////////////////////////////////////////////
function deCompress($data, &$datLen)
{
$stLen = strlen($data);
$datLen = 0;
$ret = '';
// INITIALIZATION
$this->LZWCommand($data, true);
while(($iIndex = $this->LZWCommand($data, false)) >= 0) {
$ret .= chr($iIndex);
}
$datLen = $stLen - strlen($data);
if($iIndex != -2) {
return false;
}
return $ret;
}
///////////////////////////////////////////////////////////////////////////
function LZWCommand(&$data, $bInit)
{
if($bInit) {
$this->SetCodeSize = ord($data{0});
$data = substr($data, 1);
$this->CodeSize = $this->SetCodeSize + 1;
$this->ClearCode = 1 << $this->SetCodeSize;
$this->EndCode = $this->ClearCode + 1;
$this->MaxCode = $this->ClearCode + 2;
$this->MaxCodeSize = $this->ClearCode << 1;
$this->GetCode($data, $bInit);
$this->Fresh = 1;
for($i = 0; $i < $this->ClearCode; $i++) {
$this->Next[$i] = 0;
$this->Vals[$i] = $i;
}
for(; $i < (1 << $this->MAX_LZW_BITS); $i++) {
$this->Next[$i] = 0;
$this->Vals[$i] = 0;
}
$this->sp = 0;
return 1;
}
if($this->Fresh) {
$this->Fresh = 0;
do {
$this->FirstCode = $this->GetCode($data, $bInit);
$this->OldCode = $this->FirstCode;
}
while($this->FirstCode == $this->ClearCode);
return $this->FirstCode;
}
if($this->sp > 0) {
$this->sp--;
return $this->Stack[$this->sp];
}
while(($Code = $this->GetCode($data, $bInit)) >= 0) {
if($Code == $this->ClearCode) {
for($i = 0; $i < $this->ClearCode; $i++) {
$this->Next[$i] = 0;
$this->Vals[$i] = $i;
}
for(; $i < (1 << $this->MAX_LZW_BITS); $i++) {
$this->Next[$i] = 0;
$this->Vals[$i] = 0;
}
$this->CodeSize = $this->SetCodeSize + 1;
$this->MaxCodeSize = $this->ClearCode << 1;
$this->MaxCode = $this->ClearCode + 2;
$this->sp = 0;
$this->FirstCode = $this->GetCode($data, $bInit);
$this->OldCode = $this->FirstCode;
return $this->FirstCode;
}
if($Code == $this->EndCode) {
return -2;
}
$InCode = $Code;
if($Code >= $this->MaxCode) {
$this->Stack[$this->sp] = $this->FirstCode;
$this->sp++;
$Code = $this->OldCode;
}
while($Code >= $this->ClearCode) {
$this->Stack[$this->sp] = $this->Vals[$Code];
$this->sp++;
if($Code == $this->Next[$Code]) // Circular table entry, big GIF Error!
return -1;
$Code = $this->Next[$Code];
}
$this->FirstCode = $this->Vals[$Code];
$this->Stack[$this->sp] = $this->FirstCode;
$this->sp++;
if(($Code = $this->MaxCode) < (1 << $this->MAX_LZW_BITS)) {
$this->Next[$Code] = $this->OldCode;
$this->Vals[$Code] = $this->FirstCode;
$this->MaxCode++;
if(($this->MaxCode >= $this->MaxCodeSize) && ($this->MaxCodeSize < (1 << $this->MAX_LZW_BITS))) {
$this->MaxCodeSize *= 2;
$this->CodeSize++;
}
}
$this->OldCode = $InCode;
if($this->sp > 0) {
$this->sp--;
return $this->Stack[$this->sp];
}
}
return $Code;
}
///////////////////////////////////////////////////////////////////////////
function GetCode(&$data, $bInit)
{
if($bInit) {
$this->CurBit = 0;
$this->LastBit = 0;
$this->Done = 0;
$this->LastByte = 2;
return 1;
}
if(($this->CurBit + $this->CodeSize) >= $this->LastBit) {
if($this->Done) {
if($this->CurBit >= $this->LastBit) {
// Ran off the end of my bits
return 0;
}
return -1;
}
$this->Buf[0] = $this->Buf[$this->LastByte - 2];
$this->Buf[1] = $this->Buf[$this->LastByte - 1];
$Count = ord($data{0});
$data = substr($data, 1);
if($Count) {
for($i = 0; $i < $Count; $i++) {
$this->Buf[2 + $i] = ord($data{$i});
}
$data = substr($data, $Count);
}
else {
$this->Done = 1;
}
$this->LastByte = 2 + $Count;
$this->CurBit = ($this->CurBit - $this->LastBit) + 16;
$this->LastBit = (2 + $Count) << 3;
}
$iRet = 0;
for($i = $this->CurBit, $j = 0; $j < $this->CodeSize; $i++, $j++) {
$iRet |= (($this->Buf[intval($i / 8)] & (1 << ($i % 8))) != 0) << $j;
}
$this->CurBit += $this->CodeSize;
return $iRet;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
class CGIFCOLORTABLE
{
var $m_nColors;
var $m_arColors;
///////////////////////////////////////////////////////////////////////////
// CONSTRUCTOR
function CGIFCOLORTABLE()
{
unSet($this->m_nColors);
unSet($this->m_arColors);
}
///////////////////////////////////////////////////////////////////////////
function load($lpData, $num)
{
$this->m_nColors = 0;
$this->m_arColors = array();
for($i = 0; $i < $num; $i++) {
$rgb = substr($lpData, $i * 3, 3);
if(strlen($rgb) < 3) {
return false;
}
$this->m_arColors[] = (ord($rgb{2}) << 16) + (ord($rgb{1}) << 8) + ord($rgb{0});
$this->m_nColors++;
}
return true;
}
///////////////////////////////////////////////////////////////////////////
function toString()
{
$ret = '';
for($i = 0; $i < $this->m_nColors; $i++) {
$ret .=
chr($this->m_arColors[$i] & 0x000000FF) . // R
chr(($this->m_arColors[$i] & 0x0000FF00) >> 8) . // G
chr(($this->m_arColors[$i] & 0x00FF0000) >> 16); // B
}
return $ret;
}
///////////////////////////////////////////////////////////////////////////
function toRGBQuad()
{
$ret = '';
for($i = 0; $i < $this->m_nColors; $i++) {
$ret .=
chr(($this->m_arColors[$i] & 0x00FF0000) >> 16) . // B
chr(($this->m_arColors[$i] & 0x0000FF00) >> 8) . // G
chr($this->m_arColors[$i] & 0x000000FF) . // R
"\x00";
}
return $ret;
}
///////////////////////////////////////////////////////////////////////////
function colorIndex($rgb)
{
$rgb = intval($rgb) & 0xFFFFFF;
$r1 = ($rgb & 0x0000FF);
$g1 = ($rgb & 0x00FF00) >> 8;
$b1 = ($rgb & 0xFF0000) >> 16;
$idx = -1;
for($i = 0; $i < $this->m_nColors; $i++) {
$r2 = ($this->m_arColors[$i] & 0x000000FF);
$g2 = ($this->m_arColors[$i] & 0x0000FF00) >> 8;
$b2 = ($this->m_arColors[$i] & 0x00FF0000) >> 16;
$d = abs($r2 - $r1) + abs($g2 - $g1) + abs($b2 - $b1);
if(($idx == -1) || ($d < $dif)) {
$idx = $i;
$dif = $d;
}
}
return $idx;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
class CGIFFILEHEADER
{
var $m_lpVer;
var $m_nWidth;
var $m_nHeight;
var $m_bGlobalClr;
var $m_nColorRes;
var $m_bSorted;
var $m_nTableSize;
var $m_nBgColor;
var $m_nPixelRatio;
var $m_colorTable;
///////////////////////////////////////////////////////////////////////////
// CONSTRUCTOR
function CGIFFILEHEADER()
{
unSet($this->m_lpVer);
unSet($this->m_nWidth);
unSet($this->m_nHeight);
unSet($this->m_bGlobalClr);
unSet($this->m_nColorRes);
unSet($this->m_bSorted);
unSet($this->m_nTableSize);
unSet($this->m_nBgColor);
unSet($this->m_nPixelRatio);
unSet($this->m_colorTable);
}
///////////////////////////////////////////////////////////////////////////
function load($lpData, &$hdrLen)
{
$hdrLen = 0;
$this->m_lpVer = substr($lpData, 0, 6);
if(($this->m_lpVer <> 'GIF87a') && ($this->m_lpVer <> 'GIF89a')) {
return false;
}
$this->m_nWidth = $this->w2i(substr($lpData, 6, 2));
$this->m_nHeight = $this->w2i(substr($lpData, 8, 2));
if(!$this->m_nWidth || !$this->m_nHeight) {
return false;
}
$b = ord(substr($lpData, 10, 1));
$this->m_bGlobalClr = ($b & 0x80) ? true : false;
$this->m_nColorRes = ($b & 0x70) >> 4;
$this->m_bSorted = ($b & 0x08) ? true : false;
$this->m_nTableSize = 2 << ($b & 0x07);
$this->m_nBgColor = ord(substr($lpData, 11, 1));
$this->m_nPixelRatio = ord(substr($lpData, 12, 1));
$hdrLen = 13;
if($this->m_bGlobalClr) {
$this->m_colorTable = new CGIFCOLORTABLE();
if(!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize)) {
return false;
}
$hdrLen += 3 * $this->m_nTableSize;
}
return true;
}
///////////////////////////////////////////////////////////////////////////
function w2i($str)
{
return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
class CGIFIMAGEHEADER
{
var $m_nLeft;
var $m_nTop;
var $m_nWidth;
var $m_nHeight;
var $m_bLocalClr;
var $m_bInterlace;
var $m_bSorted;
var $m_nTableSize;
var $m_colorTable;
///////////////////////////////////////////////////////////////////////////
// CONSTRUCTOR
function CGIFIMAGEHEADER()
{
unSet($this->m_nLeft);
unSet($this->m_nTop);
unSet($this->m_nWidth);
unSet($this->m_nHeight);
unSet($this->m_bLocalClr);
unSet($this->m_bInterlace);
unSet($this->m_bSorted);
unSet($this->m_nTableSize);
unSet($this->m_colorTable);
}
///////////////////////////////////////////////////////////////////////////
function load($lpData, &$hdrLen)
{
$hdrLen = 0;
$this->m_nLeft = $this->w2i(substr($lpData, 0, 2));
$this->m_nTop = $this->w2i(substr($lpData, 2, 2));
$this->m_nWidth = $this->w2i(substr($lpData, 4, 2));
$this->m_nHeight = $this->w2i(substr($lpData, 6, 2));
if(!$this->m_nWidth || !$this->m_nHeight) {
return false;
}
$b = ord($lpData{8});
$this->m_bLocalClr = ($b & 0x80) ? true : false;
$this->m_bInterlace = ($b & 0x40) ? true : false;
$this->m_bSorted = ($b & 0x20) ? true : false;
$this->m_nTableSize = 2 << ($b & 0x07);
$hdrLen = 9;
if($this->m_bLocalClr) {
$this->m_colorTable = new CGIFCOLORTABLE();
if(!$this->m_colorTable->load(substr($lpData, $hdrLen), $this->m_nTableSize)) {
return false;
}
$hdrLen += 3 * $this->m_nTableSize;
}
return true;
}
///////////////////////////////////////////////////////////////////////////
function w2i($str)
{
return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
class CGIFIMAGE
{
var $m_disp;
var $m_bUser;
var $m_bTrans;
var $m_nDelay;
var $m_nTrans;
var $m_lpComm;
var $m_gih;
var $m_data;
var $m_lzw;
///////////////////////////////////////////////////////////////////////////
function CGIFIMAGE()
{
unSet($this->m_disp);
unSet($this->m_bUser);
unSet($this->m_bTrans);
unSet($this->m_nDelay);
unSet($this->m_nTrans);
unSet($this->m_lpComm);
unSet($this->m_data);
$this->m_gih = new CGIFIMAGEHEADER();
$this->m_lzw = new CGIFLZW();
}
///////////////////////////////////////////////////////////////////////////
function load($data, &$datLen)
{
$datLen = 0;
while(true) {
$b = ord($data{0});
$data = substr($data, 1);
$datLen++;
switch($b) {
case 0x21: // Extension
if(!$this->skipExt($data, $len = 0)) {
return false;
}
$datLen += $len;
break;
case 0x2C: // Image
// LOAD HEADER & COLOR TABLE
if(!$this->m_gih->load($data, $len = 0)) {
return false;
}
$data = substr($data, $len);
$datLen += $len;
// ALLOC BUFFER
if(!($this->m_data = $this->m_lzw->deCompress($data, $len = 0))) {
return false;
}
$data = substr($data, $len);
$datLen += $len;
if($this->m_gih->m_bInterlace) {
$this->deInterlace();
}
return true;
case 0x3B: // EOF
default:
return false;
}
}
return false;
}
///////////////////////////////////////////////////////////////////////////
function skipExt(&$data, &$extLen)
{
$extLen = 0;
$b = ord($data{0});
$data = substr($data, 1);
$extLen++;
switch($b) {
case 0xF9: // Graphic Control
$b = ord($data{1});
$this->m_disp = ($b & 0x1C) >> 2;
$this->m_bUser = ($b & 0x02) ? true : false;
$this->m_bTrans = ($b & 0x01) ? true : false;
$this->m_nDelay = $this->w2i(substr($data, 2, 2));
$this->m_nTrans = ord($data{4});
break;
case 0xFE: // Comment
$this->m_lpComm = substr($data, 1, ord($data{0}));
break;
case 0x01: // Plain text
break;
case 0xFF: // Application
break;
}
// SKIP DEFAULT AS DEFS MAY CHANGE
$b = ord($data{0});
$data = substr($data, 1);
$extLen++;
while($b > 0) {
$data = substr($data, $b);
$extLen += $b;
$b = ord($data{0});
$data = substr($data, 1);
$extLen++;
}
return true;
}
///////////////////////////////////////////////////////////////////////////
function w2i($str)
{
return ord(substr($str, 0, 1)) + (ord(substr($str, 1, 1)) << 8);
}
///////////////////////////////////////////////////////////////////////////
function deInterlace()
{
$data = $this->m_data;
for($i = 0; $i < 4; $i++) {
switch($i) {
case 0:
$s = 8;
$y = 0;
break;
case 1:
$s = 8;
$y = 4;
break;
case 2:
$s = 4;
$y = 2;
break;
case 3:
$s = 2;
$y = 1;
break;
}
for(; $y < $this->m_gih->m_nHeight; $y += $s) {
$lne = substr($this->m_data, 0, $this->m_gih->m_nWidth);
$this->m_data = substr($this->m_data, $this->m_gih->m_nWidth);
$data =
substr($data, 0, $y * $this->m_gih->m_nWidth) .
$lne .
substr($data, ($y + 1) * $this->m_gih->m_nWidth);
}
}
$this->m_data = $data;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
class CGIF
{
var $m_gfh;
var $m_lpData;
var $m_img;
var $m_bLoaded;
///////////////////////////////////////////////////////////////////////////
// CONSTRUCTOR
function CGIF()
{
$this->m_gfh = new CGIFFILEHEADER();
$this->m_img = new CGIFIMAGE();
$this->m_lpData = '';
$this->m_bLoaded = false;
}
///////////////////////////////////////////////////////////////////////////
function loadFile($lpszFileName, $iIndex)
{
if($iIndex < 0) {
return false;
}
// READ FILE
if(!($fh = @fOpen($lpszFileName, 'rb'))) {
// return false;
}
//for local Gif's
// $this->m_lpData = @fRead($fh, @fileSize($lpszFileName));
//for remote Gif's
while(!feof($fh)) {
$this->m_lpData = $this->m_lpData . fread($fh, 1024);
//$this->m_lpData = @fRead($fh, @fileSize($lpszFileName));
}
fClose($fh);
// GET FILE HEADER
if(!$this->m_gfh->load($this->m_lpData, $len = 0)) {
return false;
}
$this->m_lpData = substr($this->m_lpData, $len);
do {
if(!$this->m_img->load($this->m_lpData, $imgLen = 0)) {
return false;
}
$this->m_lpData = substr($this->m_lpData, $imgLen);
}
while($iIndex-- > 0);
$this->m_bLoaded = true;
return true;
}
///////////////////////////////////////////////////////////////////////////
function getSize($lpszFileName, &$width, &$height)
{
if(!($fh = @fOpen($lpszFileName, 'rb'))) {
return false;
}
$data = @fRead($fh, @fileSize($lpszFileName));
@fClose($fh);
$gfh = new CGIFFILEHEADER();
if(!$gfh->load($data, $len = 0)) {
return false;
}
$width = $gfh->m_nWidth;
$height = $gfh->m_nHeight;
return true;
}
///////////////////////////////////////////////////////////////////////////
function getBmp($bgColor)
{
$out = '';
if(!$this->m_bLoaded) {
return false;
}
// PREPARE COLOR TABLE (RGBQUADs)
if($this->m_img->m_gih->m_bLocalClr) {
$nColors = $this->m_img->m_gih->m_nTableSize;
$rgbq = $this->m_img->m_gih->m_colorTable->toRGBQuad();
if($bgColor != -1) {
$bgColor = $this->m_img->m_gih->m_colorTable->colorIndex($bgColor);
}
}
else if($this->m_gfh->m_bGlobalClr) {
$nColors = $this->m_gfh->m_nTableSize;
$rgbq = $this->m_gfh->m_colorTable->toRGBQuad();
if($bgColor != -1) {
$bgColor = $this->m_gfh->m_colorTable->colorIndex($bgColor);
}
}
else {
$nColors = 0;
$bgColor = -1;
}
// PREPARE BITMAP BITS
$data = $this->m_img->m_data;
$nPxl = ($this->m_gfh->m_nHeight - 1) * $this->m_gfh->m_nWidth;
$bmp = '';
$nPad = ($this->m_gfh->m_nWidth % 4) ? 4 - ($this->m_gfh->m_nWidth % 4) : 0;
for($y = 0; $y < $this->m_gfh->m_nHeight; $y++) {
for($x = 0; $x < $this->m_gfh->m_nWidth; $x++, $nPxl++) {
if(
($x >= $this->m_img->m_gih->m_nLeft) &&
($y >= $this->m_img->m_gih->m_nTop) &&
($x < ($this->m_img->m_gih->m_nLeft + $this->m_img->m_gih->m_nWidth)) &&
($y < ($this->m_img->m_gih->m_nTop + $this->m_img->m_gih->m_nHeight))) {
// PART OF IMAGE
if($this->m_img->m_bTrans && (ord($data{$nPxl}) == $this->m_img->m_nTrans)) {
// TRANSPARENT -> BACKGROUND
if($bgColor == -1) {
$bmp .= chr($this->m_gfh->m_nBgColor);
}
else {
$bmp .= chr($bgColor);
}
}
else {
$bmp .= $data{$nPxl};
}
}
else {
// BACKGROUND
if($bgColor == -1) {
$bmp .= chr($this->m_gfh->m_nBgColor);
}
else {
$bmp .= chr($bgColor);
}
}
}
$nPxl -= $this->m_gfh->m_nWidth << 1;
// ADD PADDING
for($x = 0; $x < $nPad; $x++) {
$bmp .= "\x00";
}
}
// BITMAPFILEHEADER
$out .= 'BM';
$out .= $this->dword(14 + 40 + ($nColors << 2) + strlen($bmp));
$out .= "\x00\x00";
$out .= "\x00\x00";
$out .= $this->dword(14 + 40 + ($nColors << 2));
// BITMAPINFOHEADER
$out .= $this->dword(40);
$out .= $this->dword($this->m_gfh->m_nWidth);
$out .= $this->dword($this->m_gfh->m_nHeight);
$out .= "\x01\x00";
$out .= "\x08\x00";
$out .= "\x00\x00\x00\x00";
$out .= "\x00\x00\x00\x00";
$out .= "\x12\x0B\x00\x00";
$out .= "\x12\x0B\x00\x00";
$out .= $this->dword($nColors % 256);
$out .= "\x00\x00\x00\x00";
// COLOR TABLE
if($nColors > 0) {
$out .= $rgbq;
}
// DATA
$out .= $bmp;
return $out;
}
///////////////////////////////////////////////////////////////////////////
function getPng($bgColor)
{
$out = '';
if(!$this->m_bLoaded) {
return false;
}
// PREPARE COLOR TABLE (RGBQUADs)
if($this->m_img->m_gih->m_bLocalClr) {
$nColors = $this->m_img->m_gih->m_nTableSize;
$pal = $this->m_img->m_gih->m_colorTable->toString();
if($bgColor != -1) {
$bgColor = $this->m_img->m_gih->m_colorTable->colorIndex($bgColor);
}
}
else if($this->m_gfh->m_bGlobalClr) {
$nColors = $this->m_gfh->m_nTableSize;
$pal = $this->m_gfh->m_colorTable->toString();
if($bgColor != -1) {
$bgColor = $this->m_gfh->m_colorTable->colorIndex($bgColor);
}
}
else {
$nColors = 0;
$bgColor = -1;
}
// PREPARE BITMAP BITS
$data = $this->m_img->m_data;
$nPxl = 0;
$bmp = '';
for($y = 0; $y < $this->m_gfh->m_nHeight; $y++) {
$bmp .= "\x00";
for($x = 0; $x < $this->m_gfh->m_nWidth; $x++, $nPxl++) {
if(
($x >= $this->m_img->m_gih->m_nLeft) &&
($y >= $this->m_img->m_gih->m_nTop) &&
($x < ($this->m_img->m_gih->m_nLeft + $this->m_img->m_gih->m_nWidth)) &&
($y < ($this->m_img->m_gih->m_nTop + $this->m_img->m_gih->m_nHeight))) {
// PART OF IMAGE
$bmp .= $data{$nPxl};
}
else {
// BACKGROUND
if($bgColor == -1) {
$bmp .= chr($this->m_gfh->m_nBgColor);
}
else {
$bmp .= chr($bgColor);
}
}
}
}
$bmp = gzcompress($bmp, 9);
///////////////////////////////////////////////////////////////////////
// SIGNATURE
$out .= "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
///////////////////////////////////////////////////////////////////////
// HEADER
$out .= "\x00\x00\x00\x0D";
$tmp = 'IHDR';
$tmp .= $this->ndword($this->m_gfh->m_nWidth);
$tmp .= $this->ndword($this->m_gfh->m_nHeight);
$tmp .= "\x08\x03\x00\x00\x00";
$out .= $tmp;
$out .= $this->ndword(crc32($tmp));
///////////////////////////////////////////////////////////////////////
// PALETTE
if($nColors > 0) {
$out .= $this->ndword($nColors * 3);
$tmp = 'PLTE';
$tmp .= $pal;
$out .= $tmp;
$out .= $this->ndword(crc32($tmp));
}
///////////////////////////////////////////////////////////////////////
// TRANSPARENCY
if($this->m_img->m_bTrans && ($nColors > 0)) {
$out .= $this->ndword($nColors);
$tmp = 'tRNS';
for($i = 0; $i < $nColors; $i++) {
$tmp .= ($i == $this->m_img->m_nTrans) ? "\x00" : "\xFF";
}
$out .= $tmp;
$out .= $this->ndword(crc32($tmp));
}
///////////////////////////////////////////////////////////////////////
// DATA BITS
$out .= $this->ndword(strlen($bmp));
$tmp = 'IDAT';
$tmp .= $bmp;
$out .= $tmp;
$out .= $this->ndword(crc32($tmp));
///////////////////////////////////////////////////////////////////////
// END OF FILE
$out .= "\x00\x00\x00\x00IEND\xAE\x42\x60\x82";
return $out;
}
///////////////////////////////////////////////////////////////////////////
function dword($val)
{
$val = intval($val);
return chr($val & 0xFF).chr(($val & 0xFF00) >> 8).chr(($val & 0xFF0000) >> 16).chr(($val & 0xFF000000) >> 24);
}
///////////////////////////////////////////////////////////////////////////
function ndword($val)
{
$val = intval($val);
return chr(($val & 0xFF000000) >> 24).chr(($val & 0xFF0000) >> 16).chr(($val & 0xFF00) >> 8).chr($val & 0xFF);
}
///////////////////////////////////////////////////////////////////////////
function width()
{
return $this->m_gfh->m_nWidth;
}
///////////////////////////////////////////////////////////////////////////
function height()
{
return $this->m_gfh->m_nHeight;
}
///////////////////////////////////////////////////////////////////////////
function comment()
{
return $this->m_img->m_lpComm;
}
///////////////////////////////////////////////////////////////////////////
function loaded()
{
return $this->m_bLoaded;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////