mirror of
https://github.com/vichan-devel/vichan.git
synced 2024-11-24 07:30:10 +01:00
187 lines
6.9 KiB
PHP
187 lines
6.9 KiB
PHP
<?php
|
|
/*
|
|
* These functions provide a polyfill for old versions of PHP.
|
|
* PHP >= 7.2.0 provides these functions by default.
|
|
*
|
|
* These functions were submitted by user DHKold to the PHP manual in 2005.
|
|
* http://php.net/manual/en/function.imagecreate.php#53879
|
|
*
|
|
* As per http://php.net/manual/en/about.notes.php ("About user notes", PHP
|
|
* Manual), all PHP User Contributed Notes are "...considered part of the PHP
|
|
* manual, and are therefore covered by the same license that covers this
|
|
* documentation."
|
|
*
|
|
* Therefore, as per http://php.net/manual/en/copyright.php ("Copyright", PHP
|
|
* Manual), the code below is licensed under the terms of the Creative Commons
|
|
* Attribution 3.0 license, AKA CC-BY 3.0.
|
|
* http://creativecommons.org/licenses/by/3.0/
|
|
*/
|
|
|
|
/*********************************************/
|
|
/* Function: 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);
|
|
}
|
|
?>
|