forum.coppermine-gallery.net
No Support => Feature requests => Topic started by: St. Anger on July 18, 2007, 02:15:33 am
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Perhaps the ability to add support for Photoshop (.psd) files could be added into Coppermine Gallery?
The addition of a .psd reader class into PHP is relatively new, and can be gotten from here: http://www.phpclasses.org/browse/package/3627.html
What this class basically does is create .jpg images from .psd files--perfect for a gallery system. This would be an important feature for Coppermine Gallery because there is currently no gallery software with support for .psd files, but there are lots of people who would be eager to get their hands on a gallery that is capable of creating thumbnail previews of .psd files.
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If you need psd support now, you should use ImageMagick instead of GD as image library.
However, your suggestion looks promising and should be reviewed indeed. The class you suggest is released under GPL, so it could possibly be integrated into coppermine.
I'm attaching the class here for ease of use:<?
/* This file is released under the GPL, any version you like
*
* PHP PSD reader class, v1.3
*
* By Tim de Koning
*
* Kingsquare Information Services, 22 jan 2007
*
* example use:
* ------------
* <?php
* include_once('classPhpPsdReader.php')
* header("Content-type: image/jpeg");
* print imagejpeg(imagecreatefrompsd('test.psd'));
* ?>
*
* More info, bugs or requests, contact info@kingsquare.nl
*
* Latest version and demo: http://www.kingsquare.nl/phppsdreader
*
* TODO
* ----
* - read color values for "multichannel data" PSD files
* - find and implement (hunter)lab to RGB algorithm
* - fix 32 bit colors... has something to do with gamma and exposure available since CS2, but dunno how to read them...
*/
class PhpPsdReader {
var $infoArray;
var $fp;
var $fileName;
var $tempFileName;
var $colorBytesLength;
function PhpPsdReader($fileName) {
set_time_limit(0);
$this->infoArray = array();
$this->fileName = $fileName;
$this->fp = fopen($this->fileName,'r');
if (fread($this->fp,4)=='8BPS') {
$this->infoArray['version id'] = $this->_getInteger(2);
fseek($this->fp,6,SEEK_CUR); // 6 bytes of 0's
$this->infoArray['channels'] = $this->_getInteger(2);
$this->infoArray['rows'] = $this->_getInteger(4);
$this->infoArray['columns'] = $this->_getInteger(4);
$this->infoArray['colorDepth'] = $this->_getInteger(2);
$this->infoArray['colorMode'] = $this->_getInteger(2);
/* COLOR MODE DATA SECTION */ //4bytes Length The length of the following color data.
$this->infoArray['colorModeDataSectionLength'] = $this->_getInteger(4);
fseek($this->fp,$this->infoArray['colorModeDataSectionLength'],SEEK_CUR); // ignore this snizzle
/* IMAGE RESOURCES */
$this->infoArray['imageResourcesSectionLength'] = $this->_getInteger(4);
fseek($this->fp,$this->infoArray['imageResourcesSectionLength'],SEEK_CUR); // ignore this snizzle
/* LAYER AND MASK */
$this->infoArray['layerMaskDataSectionLength'] = $this->_getInteger(4);
fseek($this->fp,$this->infoArray['layerMaskDataSectionLength'],SEEK_CUR); // ignore this snizzle
/* IMAGE DATA */
$this->infoArray['compressionType'] = $this->_getInteger(2);
$this->infoArray['oneColorChannelPixelBytes'] = $this->infoArray['colorDepth']/8;
$this->colorBytesLength = $this->infoArray['rows']*$this->infoArray['columns']*$this->infoArray['oneColorChannelPixelBytes'];
if ($this->infoArray['colorMode']==2) {
$this->infoArray['error'] = 'images with indexed colours are not supported yet';
return false;
}
} else {
$this->infoArray['error'] = 'invalid or unsupported psd';
return false;
}
}
function getImage() {
// decompress image data if required
switch($this->infoArray['compressionType']) {
// case 2:, case 3: zip not supported yet..
case 1:
// packed bits
$this->infoArray['scanLinesByteCounts'] = array();
for ($i=0; $i<($this->infoArray['rows']*$this->infoArray['channels']); $i++) $this->infoArray['scanLinesByteCounts'][] = $this->_getInteger(2);
$this->tempFileName = tempnam(realpath('/tmp'),'decompressedImageData');
$tfp = fopen($this->tempFileName,'wb');
foreach ($this->infoArray['scanLinesByteCounts'] as $scanLinesByteCount) {
fwrite($tfp,$this->_getPackedBitsDecoded(fread($this->fp,$scanLinesByteCount)));
}
fclose($tfp);
fclose($this->fp);
$this->fp = fopen($this->tempFileName,'r');
default:
// continue with current file handle;
break;
}
// let's write pixel by pixel....
$image = imagecreatetruecolor($this->infoArray['columns'],$this->infoArray['rows']);
for ($rowPointer = 0; ($rowPointer < $this->infoArray['rows']); $rowPointer++) {
for ($columnPointer = 0; ($columnPointer < $this->infoArray['columns']); $columnPointer++) {
/* The color mode of the file. Supported values are: Bitmap=0;
Grayscale=1; Indexed=2; RGB=3; CMYK=4; Multichannel=7;
Duotone=8; Lab=9.
*/
switch ($this->infoArray['colorMode']) {
case 2: // indexed... info should be able to extract from color mode data section. not implemented yet, so is grayscale
exit;
break;
case 0:
// bit by bit
if ($columnPointer == 0) $bitPointer = 0;
if ($bitPointer==0) $currentByteBits = str_pad(base_convert(bin2hex(fread($this->fp,1)), 16, 2),8,'0',STR_PAD_LEFT);
$r = $g = $b = (($currentByteBits[$bitPointer]=='1')?0:255);
$bitPointer++;
if ($bitPointer==8) $bitPointer = 0;
break;
case 1:
case 8: // 8 is indexed with 1 color..., so grayscale
$r = $g = $b = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
break;
case 4: // CMYK
$c = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
$currentPointerPos = ftell($this->fp);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$m = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$y = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$k = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$currentPointerPos);
$r = round(($c * $k) / (pow(2,$this->infoArray['colorDepth'])-1));
$g = round(($m * $k) / (pow(2,$this->infoArray['colorDepth'])-1));
$b = round(($y * $k) / (pow(2,$this->infoArray['colorDepth'])-1));
break;
case 9: // hunter Lab
// i still need an understandable lab2rgb convert algorithm... if you have one, please let me know!
$l = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
$currentPointerPos = ftell($this->fp);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$a = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$b = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$currentPointerPos);
$r = $l;
$g = $a;
$b = $b;
break;
default:
$r = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
$currentPointerPos = ftell($this->fp);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$g = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$b = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$currentPointerPos);
break;
}
if (($this->infoArray['oneColorChannelPixelBytes']==2)) {
$r = $r >> 8;
$g = $g >> 8;
$b = $b >> 8;
} elseif (($this->infoArray['oneColorChannelPixelBytes']==4)) {
$r = $r >> 24;
$g = $g >> 24;
$b = $b >> 24;
}
$pixelColor = imagecolorallocate($image,$r,$g,$b);
imagesetpixel($image,$columnPointer,$rowPointer,$pixelColor);
}
}
fclose($this->fp);
if (isset($this->tempFileName)) unlink($this->tempFileName);
return $image;
}
/**
*
* PRIVATE FUNCTIONS
*
*/
function _getPackedBitsDecoded($string) {
/*
The PackBits algorithm will precede a block of data with a one byte header n, where n is interpreted as follows:
n Meaning
0 to 127 Copy the next n + 1 symbols verbatim
-127 to -1 Repeat the next symbol 1 - n times
-128 Do nothing
Decoding:
Step 1. Read the block header (n).
Step 2. If the header is an EOF exit.
Step 3. If n is non-negative, copy the next n + 1 symbols to the output stream and go to step 1.
Step 4. If n is negative, write 1 - n copies of the next symbol to the output stream and go to step 1.
*/
$stringPointer = 0;
$returnString = '';
while (1) {
if (isset($string[$stringPointer])) $headerByteValue = $this->_unsignedToSigned(hexdec(bin2hex($string[$stringPointer])),1);
else return $returnString;
$stringPointer++;
if ($headerByteValue >= 0) {
for ($i=0; $i <= $headerByteValue; $i++) {
$returnString .= $string[$stringPointer];
$stringPointer++;
}
} else {
if ($headerByteValue != -128) {
$copyByte = $string[$stringPointer];
$stringPointer++;
for ($i=0; $i < (1-$headerByteValue); $i++) {
$returnString .= $copyByte;
}
}
}
}
}
function _unsignedToSigned($int,$byteSize=1) {
switch($byteSize) {
case 1:
if ($int<128) return $int;
else return -256+$int;
break;
case 2:
if ($int<32768) return $int;
else return -65536+$int;
case 4:
if ($int<2147483648) return $int;
else return -4294967296+$int;
default:
return $int;
}
}
function _hexReverse($hex) {
$output = '';
if (strlen($hex)%2) return false;
for ($pointer = strlen($hex);$pointer>=0;$pointer-=2) $output .= substr($hex,$pointer,2);
return $output;
}
function _getInteger($byteCount=1) {
switch ($byteCount) {
case 4:
// for some strange reason this is still broken...
return @reset(unpack('N',fread($this->fp,4)));
break;
case 2:
return @reset(unpack('n',fread($this->fp,2)));
break;
default:
return hexdec($this->_hexReverse(bin2hex(fread($this->fp,$byteCount))));
}
}
}
/**
* Returns an image identifier representing the image obtained from the given filename, using only GD, returns an empty string on failure
*
* @param string $fileName
* @return image identifier
*/
function imagecreatefrompsd($fileName) {
$psdReader = new PhpPsdReader($fileName);
if (isset($psdReader->infoArray['error'])) return '';
else return $psdReader->getImage();
}
?>