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vichan/inc/image.php
Michael Save 6dbd2d3b8d use sampleImage() on GIFs as it is much faster
2012-03-12 04:58:55 +11:00

429 lines
13 KiB
PHP
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<?php
if($_SERVER['SCRIPT_FILENAME'] == str_replace('\\', '/', __FILE__)) {
// You cannot request this file directly.
header('Location: ../', true, 302);
exit;
}
class Image {
public $src, $format, $image, $size;
public function __construct($src, $format = false) {
global $config;
$this->src = $src;
$this->format = $format;
if($config['imagick']) {
$classname = 'ImageImagick';
} else {
$classname = 'Image' . strtoupper($this->format);
if(!class_exists($classname)) {
error('Unsupported file format: ' . $this->format);
}
}
$this->image = new $classname($this);
if(!$this->image->valid()) {
$this->delete();
error($config['error']['invalidimg']);
}
$this->size = (object)Array('width' => $this->image->_width(), 'height' => $this->image->_height());
if($this->size->width < 1 || $this->size->height < 1) {
$this->delete();
error($config['error']['invalidimg']);
}
}
public function resize($extension, $max_width, $max_height) {
global $config;
if($config['imagick']) {
$classname = 'ImageImagick';
} else {
$classname = 'Image' . strtoupper($extension);
if(!class_exists($classname)) {
error('Unsupported file format: ' . $extension);
}
}
$thumb = new $classname(false);
$thumb->original_width = $this->size->width;
$thumb->original_height = $this->size->height;
$x_ratio = $max_width / $this->size->width;
$y_ratio = $max_height / $this->size->height;
if(($this->size->width <= $max_width) && ($this->size->height <= $max_height)) {
$width = $this->size->width;
$height = $this->size->height;
} elseif (($x_ratio * $this->size->height) < $max_height) {
$height = ceil($x_ratio * $this->size->height);
$width = $max_width;
} else {
$width = ceil($y_ratio * $this->size->width);
$height = $max_height;
}
$thumb->_resize($this->image->image, $width, $height);
return $thumb;
}
public function to($dst) {
$this->image->to($dst);
}
public function delete() {
file_unlink($this->src);
}
public function destroy() {
$this->image->_destroy();
}
}
class ImageGD {
public function GD_create() {
$this->image = imagecreatetruecolor($this->width, $this->height);
}
public function GD_copyresampled() {
imagecopyresampled($this->image, $this->original, 0, 0, 0, 0, $this->width, $this->height, $this->original_width, $this->original_height);
}
public function GD_resize() {
$this->GD_create();
$this->GD_copyresampled();
}
}
class ImageBase extends ImageGD {
public $image, $src, $original, $original_width, $original_height, $width, $height;
public function valid() {
return (bool)$this->image;
}
public function __construct($img) {
if(method_exists($this, 'init'))
$this->init();
if($img !== false) {
$this->src = &$img->src;
$this->from();
}
}
public function _width() {
if(method_exists($this, 'width'))
return $this->width();
// use default GD functions
return imagesx($this->image);
}
public function _height() {
if(method_exists($this, 'height'))
return $this->height();
// use default GD functions
return imagesy($this->image);
}
public function _destroy() {
if(method_exists($this, 'destroy'))
return $this->destroy();
// use default GD functions
return imagedestroy($this->image);
}
public function _resize($original, $width, $height) {
$this->original = &$original;
$this->width = $width;
$this->height = $height;
if(method_exists($this, 'resize'))
$this->resize();
else
// use default GD functions
$this->GD_resize();
}
}
class ImageImagick extends ImageBase {
public function init() {
$this->image = new Imagick();
$this->image->setBackgroundColor(new ImagickPixel('transparent'));
}
public function from() {
try {
$this->image->readImage($this->src);
} catch(ImagickException $e) {
// invalid image
$this->image = false;
}
}
public function to($src) {
if(preg_match('/\.gif$/', $src))
$this->image->writeImages($src, true);
else
$this->image->writeImage($src);
}
public function width() {
return $this->image->getImageWidth();
}
public function height() {
return $this->image->getImageHeight();
}
public function destroy() {
return $this->image->destroy();
}
public function resize() {
global $config;
if($config['thumb_ext'] == 'gif') {
$this->image = new Imagick();
$this->image->setFormat('gif');
$keep_frames = Array();
for($i = 0; $i < $this->original->getNumberImages(); $i += floor($this->original->getNumberImages() / $config['thumb_keep_animation_frames']))
$keep_frames[] = $i;
$i = 0;
$delay = 0;
foreach($this->original as $frame) {
$delay += $frame->getImageDelay();
//if($i < $config['thumb_keep_animation_frames']) {
if(in_array($i, $keep_frames)) {
// $frame->scaleImage($this->width, $this->height, false);
$frame->sampleImage($this->width, $this->height);
$frame->setImagePage($this->width, $this->height, 0, 0);
$frame->setImageDelay($delay);
$delay = 0;
$this->image->addImage($frame->getImage());
}
$i++;
}
} else {
$this->image = clone $this->original;
// only resize one frame
$this->image->scaleImage($this->width, $this->height, false);
}
}
}
class ImagePNG extends ImageBase {
public function from() {
$this->image = @imagecreatefrompng($this->src);
}
public function to($src) {
global $config;
imagepng($this->image, $src, $config['thumb_quality']);
}
public function resize() {
$this->GD_create();
imagecolortransparent($this->image, imagecolorallocatealpha($this->image, 0, 0, 0, 0));
imagesavealpha($this->image, true);
imagealphablending($this->image, false);
$this->GD_copyresampled();
}
}
class ImageGIF extends ImageBase {
public function from() {
$this->image = @imagecreatefromgif($this->src);
}
public function to($src) {
imagegif($this->image, $src);
}
public function resize() {
$this->GD_create();
imagecolortransparent($this->image, imagecolorallocatealpha($this->image, 0, 0, 0, 0));
imagesavealpha($this->image, true);
$this->GD_copyresampled();
}
}
class ImageJPG extends ImageBase {
public function from() {
$this->image = @imagecreatefromjpeg($this->src);
}
public function to($src) {
imagejpeg($this->image, $src);
}
}
class ImageJPEG extends ImageJPG {
}
class ImageBMP extends ImageBase {
public function from() {
$this->image = @imagecreatefrombmp($this->src);
}
public function to($src) {
imagebmp($this->image, $src);
}
}
/*********************************************/
/* Fonction: imagecreatefrombmp */
/* Author: DHKold */
/* Contact: admin@dhkold.com */
/* Date: The 15th of June 2005 */
/* Version: 2.0B */
/*********************************************/
function imagecreatefrombmp($filename) {
if (! $f1 = fopen($filename,"rb")) return FALSE;
$FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14));
if ($FILE['file_type'] != 19778) return FALSE;
$BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
'/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
'/Vvert_resolution/Vcolors_used/Vcolors_important', fread($f1,40));
$BMP['colors'] = pow(2,$BMP['bits_per_pixel']);
if ($BMP['size_bitmap'] == 0) $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset'];
$BMP['bytes_per_pixel'] = $BMP['bits_per_pixel']/8;
$BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']);
$BMP['decal'] = ($BMP['width']*$BMP['bytes_per_pixel']/4);
$BMP['decal'] -= floor($BMP['width']*$BMP['bytes_per_pixel']/4);
$BMP['decal'] = 4-(4*$BMP['decal']);
if ($BMP['decal'] == 4) $BMP['decal'] = 0;
$PALETTE = array();
if ($BMP['colors'] < 16777216)
{
$PALETTE = unpack('V'.$BMP['colors'], fread($f1,$BMP['colors']*4));
}
$IMG = fread($f1,$BMP['size_bitmap']);
$VIDE = chr(0);
$res = imagecreatetruecolor($BMP['width'],$BMP['height']);
$P = 0;
$Y = $BMP['height']-1;
while ($Y >= 0)
{
$X=0;
while ($X < $BMP['width'])
{
if ($BMP['bits_per_pixel'] == 24)
$COLOR = unpack("V",substr($IMG,$P,3).$VIDE);
elseif ($BMP['bits_per_pixel'] == 16)
{
$COLOR = unpack("n",substr($IMG,$P,2));
$COLOR[1] = $PALETTE[$COLOR[1]+1];
}
elseif ($BMP['bits_per_pixel'] == 8)
{
$COLOR = unpack("n",$VIDE.substr($IMG,$P,1));
$COLOR[1] = $PALETTE[$COLOR[1]+1];
}
elseif ($BMP['bits_per_pixel'] == 4)
{
$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
if (($P*2)%2 == 0) $COLOR[1] = ($COLOR[1] >> 4) ; else $COLOR[1] = ($COLOR[1] & 0x0F);
$COLOR[1] = $PALETTE[$COLOR[1]+1];
}
elseif ($BMP['bits_per_pixel'] == 1)
{
$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
if (($P*8)%8 == 0) $COLOR[1] = $COLOR[1] >>7;
elseif (($P*8)%8 == 1) $COLOR[1] = ($COLOR[1] & 0x40)>>6;
elseif (($P*8)%8 == 2) $COLOR[1] = ($COLOR[1] & 0x20)>>5;
elseif (($P*8)%8 == 3) $COLOR[1] = ($COLOR[1] & 0x10)>>4;
elseif (($P*8)%8 == 4) $COLOR[1] = ($COLOR[1] & 0x8)>>3;
elseif (($P*8)%8 == 5) $COLOR[1] = ($COLOR[1] & 0x4)>>2;
elseif (($P*8)%8 == 6) $COLOR[1] = ($COLOR[1] & 0x2)>>1;
elseif (($P*8)%8 == 7) $COLOR[1] = ($COLOR[1] & 0x1);
$COLOR[1] = $PALETTE[$COLOR[1]+1];
}
else
return FALSE;
imagesetpixel($res,$X,$Y,$COLOR[1]);
$X++;
$P += $BMP['bytes_per_pixel'];
}
$Y--;
$P+=$BMP['decal'];
}
fclose($f1);
return $res;
}
function imagebmp(&$img, $filename='') {
$widthOrig = imagesx($img);
$widthFloor = ((floor($widthOrig/16))*16);
$widthCeil = ((ceil($widthOrig/16))*16);
$height = imagesy($img);
$size = ($widthCeil*$height*3)+54;
// Bitmap File Header
$result = 'BM'; // header (2b)
$result .= int_to_dword($size); // size of file (4b)
$result .= int_to_dword(0); // reserved (4b)
$result .= int_to_dword(54); // byte location in the file which is first byte of IMAGE (4b)
// Bitmap Info Header
$result .= int_to_dword(40); // Size of BITMAPINFOHEADER (4b)
$result .= int_to_dword($widthCeil); // width of bitmap (4b)
$result .= int_to_dword($height); // height of bitmap (4b)
$result .= int_to_word(1); // biPlanes = 1 (2b)
$result .= int_to_word(24); // biBitCount = {1 (mono) or 4 (16 clr ) or 8 (256 clr) or 24 (16 Mil)} (2b
$result .= int_to_dword(0); // RLE COMPRESSION (4b)
$result .= int_to_dword(0); // width x height (4b)
$result .= int_to_dword(0); // biXPelsPerMeter (4b)
$result .= int_to_dword(0); // biYPelsPerMeter (4b)
$result .= int_to_dword(0); // Number of palettes used (4b)
$result .= int_to_dword(0); // Number of important colour (4b)
// is faster than chr()
$arrChr = array();
for($i=0; $i<256; $i++){
$arrChr[$i] = chr($i);
}
// creates image data
$bgfillcolor = array('red'=>0, 'green'=>0, 'blue'=>0);
// bottom to top - left to right - attention blue green red !!!
$y=$height-1;
for ($y2=0; $y2<$height; $y2++) {
for ($x=0; $x<$widthFloor; ) {
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
}
for ($x=$widthFloor; $x<$widthCeil; $x++) {
$rgb = ($x<$widthOrig) ? imagecolorsforindex($img, imagecolorat($img, $x, $y)) : $bgfillcolor;
$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
}
$y--;
}
// see imagegif
if($filename == '') {
echo $result;
} else {
$file = fopen($filename, 'wb');
fwrite($file, $result);
fclose($file);
}
}
// imagebmp helpers
function int_to_dword($n) {
return chr($n & 255).chr(($n >> 8) & 255).chr(($n >> 16) & 255).chr(($n >> 24) & 255);
}
function int_to_word($n) {
return chr($n & 255).chr(($n >> 8) & 255);
}
?>
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