/**
* Object constructor
*
* @param string $imageFileName
* @throws \Zend\Pdf\Exception
*/
public function __construct($imageFileName)
{
if (!function_exists('gd_info')) {
throw new Exception\RuntimeException('Image extension is not installed.');
}
$gd_options = gd_info();
if ((!isset($gd_options['JPG Support']) || $gd_options['JPG Support'] != true) && (!isset($gd_options['JPEG Support']) || $gd_options['JPEG Support'] != true)) {
throw new Exception\RuntimeException('JPG support is not configured properly.');
}
if (!is_readable($imageFileName)) {
throw new Exception\IOException("File '{$imageFileName}' is not readable.");
}
if (($imageInfo = getimagesize($imageFileName)) === false) {
throw new Exception\CorruptedImageException('Corrupted image.');
}
if ($imageInfo[2] != IMAGETYPE_JPEG && $imageInfo[2] != IMAGETYPE_JPEG2000) {
throw new Exception\DomainException('ImageType is not JPG');
}
parent::__construct();
switch ($imageInfo['channels']) {
case 3:
$colorSpace = 'DeviceRGB';
break;
case 4:
$colorSpace = 'DeviceCMYK';
break;
default:
$colorSpace = 'DeviceGray';
break;
}
$imageDictionary = $this->_resource->dictionary;
$imageDictionary->Width = new InternalType\NumericObject($imageInfo[0]);
$imageDictionary->Height = new InternalType\NumericObject($imageInfo[1]);
$imageDictionary->ColorSpace = new InternalType\NameObject($colorSpace);
$imageDictionary->BitsPerComponent = new InternalType\NumericObject($imageInfo['bits']);
if ($imageInfo[2] == IMAGETYPE_JPEG) {
$imageDictionary->Filter = new InternalType\NameObject('DCTDecode');
} else {
if ($imageInfo[2] == IMAGETYPE_JPEG2000) {
$imageDictionary->Filter = new InternalType\NameObject('JPXDecode');
}
}
if (($imageFile = @fopen($imageFileName, 'rb')) === false) {
throw new Exception\IOException("Can not open '{$imageFileName}' file for reading.");
}
$byteCount = filesize($imageFileName);
$this->_resource->value = '';
while ($byteCount > 0 && ($nextBlock = fread($imageFile, $byteCount)) != false) {
$this->_resource->value .= $nextBlock;
$byteCount -= strlen($nextBlock);
}
fclose($imageFile);
$this->_resource->skipFilters();
$this->_width = $imageInfo[0];
$this->_height = $imageInfo[1];
$this->_imageProperties = array();
$this->_imageProperties['bitDepth'] = $imageInfo['bits'];
$this->_imageProperties['jpegImageType'] = $imageInfo[2];
$this->_imageProperties['jpegColorType'] = $imageInfo['channels'];
}
/**
* Object constructor
*
* @param string $imageFileName
* @throws \Zend\Pdf\Exception
*/
public function __construct($imageFileName)
{
if (($imageFile = @fopen($imageFileName, 'rb')) === false) {
throw new Exception\IOException("Can not open '{$imageFileName}' file for reading.");
}
$byteOrderIndicator = fread($imageFile, 2);
if ($byteOrderIndicator == 'II') {
$this->_endianType = self::TIFF_ENDIAN_LITTLE;
} else {
if ($byteOrderIndicator == 'MM') {
$this->_endianType = self::TIFF_ENDIAN_BIG;
} else {
throw new Exception\DomainException('Not a tiff file or Tiff corrupt. No byte order indication found');
}
}
$version = $this->unpackBytes(self::UNPACK_TYPE_SHORT, fread($imageFile, 2));
if ($version != 42) {
throw new Exception\DomainException('Not a tiff file or Tiff corrupt. Incorrect version number.');
}
$ifdOffset = $this->unpackBytes(self::UNPACK_TYPE_LONG, fread($imageFile, 4));
$fileStats = fstat($imageFile);
$this->_fileSize = $fileStats['size'];
/*
* Tiff files are stored as a series of Image File Directories (IFD) each direcctory
* has a specific number of entries each 12 bytes in length. At the end of the directories
* is four bytes pointing to the offset of the next IFD.
*/
while ($ifdOffset > 0) {
if (fseek($imageFile, $ifdOffset, SEEK_SET) == -1 || $ifdOffset + 2 >= $this->_fileSize) {
throw new Exception\CorruptedImageException("Could not seek to the image file directory as indexed by the file. Likely cause is TIFF corruption. Offset: " . $ifdOffset);
}
$numDirEntries = $this->unpackBytes(self::UNPACK_TYPE_SHORT, fread($imageFile, 2));
/*
* Since we now know how many entries are in this (IFD) we can extract the data.
* The format of a TIFF directory entry is:
*
* 2 bytes (short) tag code; See TIFF_TAG constants at the top for supported values. (There are many more in the spec)
* 2 bytes (short) field type
* 4 bytes (long) number of values, or value count.
* 4 bytes (mixed) data if the data will fit into 4 bytes or an offset if the data is too large.
*/
for ($dirEntryIdx = 1; $dirEntryIdx <= $numDirEntries; $dirEntryIdx++) {
$tag = $this->unpackBytes(self::UNPACK_TYPE_SHORT, fread($imageFile, 2));
$fieldType = $this->unpackBytes(self::UNPACK_TYPE_SHORT, fread($imageFile, 2));
$valueCount = $this->unpackBytes(self::UNPACK_TYPE_LONG, fread($imageFile, 4));
switch ($fieldType) {
case self::TIFF_FIELD_TYPE_BYTE:
$fieldLength = $valueCount;
break;
case self::TIFF_FIELD_TYPE_ASCII:
$fieldLength = $valueCount;
break;
case self::TIFF_FIELD_TYPE_SHORT:
$fieldLength = $valueCount * 2;
break;
case self::TIFF_FIELD_TYPE_LONG:
$fieldLength = $valueCount * 4;
break;
case self::TIFF_FIELD_TYPE_RATIONAL:
$fieldLength = $valueCount * 8;
break;
default:
$fieldLength = $valueCount;
}
$offsetBytes = fread($imageFile, 4);
if ($fieldLength <= 4) {
switch ($fieldType) {
case self::TIFF_FIELD_TYPE_BYTE:
$value = $this->unpackBytes(self::UNPACK_TYPE_BYTE, $offsetBytes);
break;
case self::TIFF_FIELD_TYPE_ASCII:
//Fall through to next case
//Fall through to next case
case self::TIFF_FIELD_TYPE_LONG:
$value = $this->unpackBytes(self::UNPACK_TYPE_LONG, $offsetBytes);
break;
case self::TIFF_FIELD_TYPE_SHORT:
//Fall through to next case
//Fall through to next case
default:
$value = $this->unpackBytes(self::UNPACK_TYPE_SHORT, $offsetBytes);
}
} else {
$refOffset = $this->unpackBytes(self::UNPACK_TYPE_LONG, $offsetBytes);
}
/*
* Linear tag processing is probably not the best way to do this. I've processed the tags according to the
* Tiff 6 specification and make some assumptions about when tags will be < 4 bytes and fit into $value and when
* they will be > 4 bytes and require seek/extraction of the offset. Same goes for extracting arrays of data, like
* the data offsets and length. This should be fixed in the future.
*/
switch ($tag) {
case self::TIFF_TAG_IMAGE_WIDTH:
$this->_width = $value;
break;
case self::TIFF_TAG_IMAGE_LENGTH:
$this->_height = $value;
break;
case self::TIFF_TAG_BITS_PER_SAMPLE:
if ($valueCount > 1) {
$fp = ftell($imageFile);
fseek($imageFile, $refOffset, SEEK_SET);
$this->_bitsPerSample = $this->unpackBytes(self::UNPACK_TYPE_SHORT, fread($imageFile, 2));
fseek($imageFile, $fp, SEEK_SET);
} else {
$this->_bitsPerSample = $value;
}
break;
case self::TIFF_TAG_COMPRESSION:
$this->_compression = $value;
switch ($value) {
case self::TIFF_COMPRESSION_UNCOMPRESSED:
$this->_filter = 'None';
break;
case self::TIFF_COMPRESSION_CCITT1D:
//Fall through to next case
//Fall through to next case
case self::TIFF_COMPRESSION_GROUP_3_FAX:
//Fall through to next case
//Fall through to next case
case self::TIFF_COMPRESSION_GROUP_4_FAX:
$this->_filter = 'CCITTFaxDecode';
throw new Exception\NotImplementedException('CCITTFaxDecode Compression Mode Not Currently Supported');
break;
case self::TIFF_COMPRESSION_LZW:
$this->_filter = 'LZWDecode';
throw new Exception\NotImplementedException('LZWDecode Compression Mode Not Currently Supported');
break;
case self::TIFF_COMPRESSION_JPEG:
$this->_filter = 'DCTDecode';
//Should work, doesnt...
throw new Exception\NotImplementedException('JPEG Compression Mode Not Currently Supported');
break;
case self::TIFF_COMPRESSION_FLATE:
//fall through to next case
//fall through to next case
case self::TIFF_COMPRESSION_FLATE_OBSOLETE_CODE:
$this->_filter = 'FlateDecode';
throw new Exception\NotImplementedException('ZIP/Flate Compression Mode Not Currently Supported');
break;
case self::TIFF_COMPRESSION_PACKBITS:
$this->_filter = 'RunLengthDecode';
break;
}
break;
case self::TIFF_TAG_PHOTOMETRIC_INTERPRETATION:
$this->_colorCode = $value;
$this->_whiteIsZero = false;
$this->_blackIsZero = false;
switch ($value) {
case self::TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO:
$this->_whiteIsZero = true;
$this->_colorSpace = 'DeviceGray';
break;
case self::TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO:
$this->_blackIsZero = true;
$this->_colorSpace = 'DeviceGray';
break;
case self::TIFF_PHOTOMETRIC_INTERPRETATION_YCBCR:
//fall through to next case
//fall through to next case
case self::TIFF_PHOTOMETRIC_INTERPRETATION_RGB:
$this->_colorSpace = 'DeviceRGB';
break;
case self::TIFF_PHOTOMETRIC_INTERPRETATION_RGB_INDEXED:
$this->_colorSpace = 'Indexed';
break;
case self::TIFF_PHOTOMETRIC_INTERPRETATION_CMYK:
$this->_colorSpace = 'DeviceCMYK';
break;
case self::TIFF_PHOTOMETRIC_INTERPRETATION_CIELAB:
$this->_colorSpace = 'Lab';
break;
default:
throw new Exception\NotImplementedException('TIFF: Unknown or Unsupported Color Type: ' . $value);
}
break;
case self::TIFF_TAG_STRIP_OFFSETS:
if ($valueCount > 1) {
$format = $this->_endianType == self::TIFF_ENDIAN_LITTLE ? 'V*' : 'N*';
$fp = ftell($imageFile);
fseek($imageFile, $refOffset, SEEK_SET);
$stripOffsetsBytes = fread($imageFile, $fieldLength);
$this->_imageDataOffset = unpack($format, $stripOffsetsBytes);
fseek($imageFile, $fp, SEEK_SET);
} else {
$this->_imageDataOffset = $value;
}
break;
case self::TIFF_TAG_STRIP_BYTE_COUNTS:
if ($valueCount > 1) {
$format = $this->_endianType == self::TIFF_ENDIAN_LITTLE ? 'V*' : 'N*';
$fp = ftell($imageFile);
fseek($imageFile, $refOffset, SEEK_SET);
$stripByteCountsBytes = fread($imageFile, $fieldLength);
$this->_imageDataLength = unpack($format, $stripByteCountsBytes);
fseek($imageFile, $fp, SEEK_SET);
} else {
$this->_imageDataLength = $value;
}
break;
default:
//For debugging. It should be harmless to ignore unknown tags, though there is some good info in them.
//echo "Unknown tag detected: ". $tag . " value: ". $value;
}
}
$ifdOffset = $this->unpackBytes(self::UNPACK_TYPE_LONG, fread($imageFile, 4));
}
if (!isset($this->_imageDataOffset) || !isset($this->_imageDataLength)) {
throw new Exception\CorruptedImageException('TIFF: The image processed did not contain image data as expected.');
}
$imageDataBytes = '';
if (is_array($this->_imageDataOffset)) {
if (!is_array($this->_imageDataLength)) {
throw new Exception\CorruptedImageException('TIFF: The image contained multiple data offsets but not multiple data lengths. Tiff may be corrupt.');
}
foreach ($this->_imageDataOffset as $idx => $offset) {
fseek($imageFile, $this->_imageDataOffset[$idx], SEEK_SET);
$imageDataBytes .= fread($imageFile, $this->_imageDataLength[$idx]);
}
} else {
fseek($imageFile, $this->_imageDataOffset, SEEK_SET);
$imageDataBytes = fread($imageFile, $this->_imageDataLength);
}
if ($imageDataBytes === '') {
throw new Exception\CorruptedImageException('TIFF: No data. Image Corruption');
}
fclose($imageFile);
parent::__construct();
$imageDictionary = $this->_resource->dictionary;
if (!isset($this->_width) || !isset($this->_height)) {
throw new Exception\CorruptedImageException('Problem reading tiff file. Tiff is probably corrupt.');
}
$this->_imageProperties = array();
$this->_imageProperties['bitDepth'] = $this->_bitsPerSample;
$this->_imageProperties['fileSize'] = $this->_fileSize;
$this->_imageProperties['TIFFendianType'] = $this->_endianType;
$this->_imageProperties['TIFFcompressionType'] = $this->_compression;
$this->_imageProperties['TIFFwhiteIsZero'] = $this->_whiteIsZero;
$this->_imageProperties['TIFFblackIsZero'] = $this->_blackIsZero;
$this->_imageProperties['TIFFcolorCode'] = $this->_colorCode;
$this->_imageProperties['TIFFimageDataOffset'] = $this->_imageDataOffset;
$this->_imageProperties['TIFFimageDataLength'] = $this->_imageDataLength;
$this->_imageProperties['PDFfilter'] = $this->_filter;
$this->_imageProperties['PDFcolorSpace'] = $this->_colorSpace;
$imageDictionary->Width = new InternalType\NumericObject($this->_width);
if ($this->_whiteIsZero === true) {
$imageDictionary->Decode = new InternalType\ArrayObject(array(new InternalType\NumericObject(1), new InternalType\NumericObject(0)));
}
$imageDictionary->Height = new InternalType\NumericObject($this->_height);
$imageDictionary->ColorSpace = new InternalType\NameObject($this->_colorSpace);
$imageDictionary->BitsPerComponent = new InternalType\NumericObject($this->_bitsPerSample);
if (isset($this->_filter) && $this->_filter != 'None') {
$imageDictionary->Filter = new InternalType\NameObject($this->_filter);
}
$this->_resource->value = $imageDataBytes;
$this->_resource->skipFilters();
}
/**
* Object constructor
*
* @param string $imageFileName
* @throws \Zend\Pdf\Exception
* @todo Add compression conversions to support compression strategys other than PNG_COMPRESSION_DEFAULT_STRATEGY.
* @todo Add pre-compression filtering.
* @todo Add interlaced image handling.
* @todo Add support for 16-bit images. Requires PDF version bump to 1.5 at least.
* @todo Add processing for all PNG chunks defined in the spec. gAMA etc.
* @todo Fix tRNS chunk support for Indexed Images to a SMask.
*/
public function __construct($imageFileName)
{
if (($imageFile = @fopen($imageFileName, 'rb')) === false) {
throw new Exception\IOException("Can not open '{$imageFileName}' file for reading.");
}
parent::__construct();
//Check if the file is a PNG
fseek($imageFile, 1, SEEK_CUR);
//First signature byte (%)
if ('PNG' != fread($imageFile, 3)) {
throw new Exception\DomainException('Image is not a PNG');
}
fseek($imageFile, 12, SEEK_CUR);
//Signature bytes (Includes the IHDR chunk) IHDR processed linerarly because it doesnt contain a variable chunk length
$wtmp = unpack('Ni', fread($imageFile, 4));
//Unpack a 4-Byte Long
$width = $wtmp['i'];
$htmp = unpack('Ni', fread($imageFile, 4));
$height = $htmp['i'];
$bits = ord(fread($imageFile, 1));
//Higher than 8 bit depths are only supported in later versions of PDF.
$color = ord(fread($imageFile, 1));
$compression = ord(fread($imageFile, 1));
$prefilter = ord(fread($imageFile, 1));
if (($interlacing = ord(fread($imageFile, 1))) != self::PNG_INTERLACING_DISABLED) {
throw new Exception\NotImplementedException('Only non-interlaced images are currently supported.');
}
$this->_width = $width;
$this->_height = $height;
$this->_imageProperties = array();
$this->_imageProperties['bitDepth'] = $bits;
$this->_imageProperties['pngColorType'] = $color;
$this->_imageProperties['pngFilterType'] = $prefilter;
$this->_imageProperties['pngCompressionType'] = $compression;
$this->_imageProperties['pngInterlacingType'] = $interlacing;
fseek($imageFile, 4, SEEK_CUR);
//4 Byte Ending Sequence
$imageData = '';
/*
* The following loop processes PNG chunks. 4 Byte Longs are packed first give the chunk length
* followed by the chunk signature, a four byte code. IDAT and IEND are manditory in any PNG.
*/
while (($chunkLengthBytes = fread($imageFile, 4)) !== false) {
$chunkLengthtmp = unpack('Ni', $chunkLengthBytes);
$chunkLength = $chunkLengthtmp['i'];
$chunkType = fread($imageFile, 4);
switch ($chunkType) {
case 'IDAT':
//Image Data
/*
* Reads the actual image data from the PNG file. Since we know at this point that the compression
* strategy is the default strategy, we also know that this data is Zip compressed. We will either copy
* the data directly to the PDF and provide the correct FlateDecode predictor, or decompress the data
* decode the filters and output the data as a raw pixel map.
*/
$imageData .= fread($imageFile, $chunkLength);
fseek($imageFile, 4, SEEK_CUR);
break;
case 'PLTE':
//Palette
$paletteData = fread($imageFile, $chunkLength);
fseek($imageFile, 4, SEEK_CUR);
break;
case 'tRNS':
//Basic (non-alpha channel) transparency.
$trnsData = fread($imageFile, $chunkLength);
switch ($color) {
case self::PNG_CHANNEL_GRAY:
$baseColor = ord(substr($trnsData, 1, 1));
$transparencyData = array(new InternalType\NumericObject($baseColor), new InternalType\NumericObject($baseColor));
break;
case self::PNG_CHANNEL_RGB:
$red = ord(substr($trnsData, 1, 1));
$green = ord(substr($trnsData, 3, 1));
$blue = ord(substr($trnsData, 5, 1));
$transparencyData = array(new InternalType\NumericObject($red), new InternalType\NumericObject($red), new InternalType\NumericObject($green), new InternalType\NumericObject($green), new InternalType\NumericObject($blue), new InternalType\NumericObject($blue));
break;
case self::PNG_CHANNEL_INDEXED:
//Find the first transparent color in the index, we will mask that. (This is a bit of a hack. This should be a SMask and mask all entries values).
if (($trnsIdx = strpos($trnsData, "")) !== false) {
$transparencyData = array(new InternalType\NumericObject($trnsIdx), new InternalType\NumericObject($trnsIdx));
}
break;
case self::PNG_CHANNEL_GRAY_ALPHA:
// Fall through to the next case
// Fall through to the next case
// Fall through to the next case
// Fall through to the next case
case self::PNG_CHANNEL_RGB_ALPHA:
throw new Exception\CorruptedImageException("tRNS chunk illegal for Alpha Channel Images");
break;
}
fseek($imageFile, 4, SEEK_CUR);
//4 Byte Ending Sequence
break;
case 'IEND':
break 2;
//End the loop too
//End the loop too
//End the loop too
//End the loop too
default:
fseek($imageFile, $chunkLength + 4, SEEK_CUR);
//Skip the section
break;
}
}
fclose($imageFile);
$compressed = true;
$imageDataTmp = '';
$smaskData = '';
switch ($color) {
case self::PNG_CHANNEL_RGB:
$colorSpace = new InternalType\NameObject('DeviceRGB');
break;
case self::PNG_CHANNEL_GRAY:
$colorSpace = new InternalType\NameObject('DeviceGray');
break;
case self::PNG_CHANNEL_INDEXED:
if (empty($paletteData)) {
throw new Exception\CorruptedImageException("PNG Corruption: No palette data read for indexed type PNG.");
}
$colorSpace = new InternalType\ArrayObject();
$colorSpace->items[] = new InternalType\NameObject('Indexed');
$colorSpace->items[] = new InternalType\NameObject('DeviceRGB');
$colorSpace->items[] = new InternalType\NumericObject(strlen($paletteData) / 3 - 1);
$paletteObject = $this->_objectFactory->newObject(new InternalType\BinaryStringObject($paletteData));
$colorSpace->items[] = $paletteObject;
break;
case self::PNG_CHANNEL_GRAY_ALPHA:
/*
* To decode PNG's with alpha data we must create two images from one. One image will contain the Gray data
* the other will contain the Gray transparency overlay data. The former will become the object data and the latter
* will become the Shadow Mask (SMask).
*/
if ($bits > 8) {
throw new Exception\NotImplementedException('Alpha PNGs with bit depth > 8 are not yet supported');
}
$colorSpace = new InternalType\NameObject('DeviceGray');
$decodingObjFactory = ObjectFactory::createFactory(1);
$decodingStream = $decodingObjFactory->newStreamObject($imageData);
$decodingStream->dictionary->Filter = new InternalType\NameObject('FlateDecode');
$decodingStream->dictionary->DecodeParms = new InternalType\DictionaryObject();
$decodingStream->dictionary->DecodeParms->Predictor = new InternalType\NumericObject(15);
$decodingStream->dictionary->DecodeParms->Columns = new InternalType\NumericObject($width);
$decodingStream->dictionary->DecodeParms->Colors = new InternalType\NumericObject(2);
//GreyAlpha
$decodingStream->dictionary->DecodeParms->BitsPerComponent = new InternalType\NumericObject($bits);
$decodingStream->skipFilters();
$pngDataRawDecoded = $decodingStream->value;
//Iterate every pixel and copy out gray data and alpha channel (this will be slow)
for ($pixel = 0, $pixelcount = $width * $height; $pixel < $pixelcount; $pixel++) {
$imageDataTmp .= $pngDataRawDecoded[$pixel * 2];
$smaskData .= $pngDataRawDecoded[$pixel * 2 + 1];
}
$compressed = false;
$imageData = $imageDataTmp;
//Overwrite image data with the gray channel without alpha
break;
case self::PNG_CHANNEL_RGB_ALPHA:
/*
* To decode PNG's with alpha data we must create two images from one. One image will contain the RGB data
* the other will contain the Gray transparency overlay data. The former will become the object data and the latter
* will become the Shadow Mask (SMask).
*/
if ($bits > 8) {
throw new Exception\NotImplementedException('Alpha PNGs with bit depth > 8 are not yet supported');
}
$colorSpace = new InternalType\NameObject('DeviceRGB');
$decodingObjFactory = ObjectFactory::createFactory(1);
$decodingStream = $decodingObjFactory->newStreamObject($imageData);
$decodingStream->dictionary->Filter = new InternalType\NameObject('FlateDecode');
$decodingStream->dictionary->DecodeParms = new InternalType\DictionaryObject();
$decodingStream->dictionary->DecodeParms->Predictor = new InternalType\NumericObject(15);
$decodingStream->dictionary->DecodeParms->Columns = new InternalType\NumericObject($width);
$decodingStream->dictionary->DecodeParms->Colors = new InternalType\NumericObject(4);
//RGBA
$decodingStream->dictionary->DecodeParms->BitsPerComponent = new InternalType\NumericObject($bits);
$decodingStream->skipFilters();
$pngDataRawDecoded = $decodingStream->value;
//Iterate every pixel and copy out rgb data and alpha channel (this will be slow)
for ($pixel = 0, $pixelcount = $width * $height; $pixel < $pixelcount; $pixel++) {
$imageDataTmp .= $pngDataRawDecoded[$pixel * 4 + 0] . $pngDataRawDecoded[$pixel * 4 + 1] . $pngDataRawDecoded[$pixel * 4 + 2];
$smaskData .= $pngDataRawDecoded[$pixel * 4 + 3];
}
$compressed = false;
$imageData = $imageDataTmp;
//Overwrite image data with the RGB channel without alpha
break;
default:
throw new Exception\CorruptedImageException('PNG Corruption: Invalid color space.');
}
if (empty($imageData)) {
throw new Exception\CorruptedImageException('Corrupt PNG Image. Mandatory IDAT chunk not found.');
}
$imageDictionary = $this->_resource->dictionary;
if (!empty($smaskData)) {
/*
* Includes the Alpha transparency data as a Gray Image, then assigns the image as the Shadow Mask for the main image data.
*/
$smaskStream = $this->_objectFactory->newStreamObject($smaskData);
$smaskStream->dictionary->Type = new InternalType\NameObject('XObject');
$smaskStream->dictionary->Subtype = new InternalType\NameObject('Image');
$smaskStream->dictionary->Width = new InternalType\NumericObject($width);
$smaskStream->dictionary->Height = new InternalType\NumericObject($height);
$smaskStream->dictionary->ColorSpace = new InternalType\NameObject('DeviceGray');
$smaskStream->dictionary->BitsPerComponent = new InternalType\NumericObject($bits);
$imageDictionary->SMask = $smaskStream;
// Encode stream with FlateDecode filter
$smaskStreamDecodeParms = array();
$smaskStreamDecodeParms['Predictor'] = new InternalType\NumericObject(15);
$smaskStreamDecodeParms['Columns'] = new InternalType\NumericObject($width);
$smaskStreamDecodeParms['Colors'] = new InternalType\NumericObject(1);
$smaskStreamDecodeParms['BitsPerComponent'] = new InternalType\NumericObject(8);
$smaskStream->dictionary->DecodeParms = new InternalType\DictionaryObject($smaskStreamDecodeParms);
$smaskStream->dictionary->Filter = new InternalType\NameObject('FlateDecode');
}
if (!empty($transparencyData)) {
//This is experimental and not properly tested.
$imageDictionary->Mask = new InternalType\ArrayObject($transparencyData);
}
$imageDictionary->Width = new InternalType\NumericObject($width);
$imageDictionary->Height = new InternalType\NumericObject($height);
$imageDictionary->ColorSpace = $colorSpace;
$imageDictionary->BitsPerComponent = new InternalType\NumericObject($bits);
$imageDictionary->Filter = new InternalType\NameObject('FlateDecode');
$decodeParms = array();
$decodeParms['Predictor'] = new InternalType\NumericObject(15);
// Optimal prediction
$decodeParms['Columns'] = new InternalType\NumericObject($width);
$decodeParms['Colors'] = new InternalType\NumericObject($color == self::PNG_CHANNEL_RGB || $color == self::PNG_CHANNEL_RGB_ALPHA ? 3 : 1);
$decodeParms['BitsPerComponent'] = new InternalType\NumericObject($bits);
$imageDictionary->DecodeParms = new InternalType\DictionaryObject($decodeParms);
//Include only the image IDAT section data.
$this->_resource->value = $imageData;
//Skip double compression
if ($compressed) {
$this->_resource->skipFilters();
}
}
