mirror of
https://github.com/vichan-devel/vichan.git
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187 lines
6.9 KiB
PHP
187 lines
6.9 KiB
PHP
<?php
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/*
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* These functions provide a polyfill for old versions of PHP.
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* PHP >= 7.2.0 provides these functions by default.
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*
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* These functions were submitted by user DHKold to the PHP manual in 2005.
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* http://php.net/manual/en/function.imagecreate.php#53879
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*
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* As per http://php.net/manual/en/about.notes.php ("About user notes", PHP
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* Manual), all PHP User Contributed Notes are "...considered part of the PHP
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* manual, and are therefore covered by the same license that covers this
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* documentation."
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*
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* Therefore, as per http://php.net/manual/en/copyright.php ("Copyright", PHP
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* Manual), the code below is licensed under the terms of the Creative Commons
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* Attribution 3.0 license, AKA CC-BY 3.0.
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* http://creativecommons.org/licenses/by/3.0/
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*/
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/*********************************************/
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/* Function: imagecreatefrombmp */
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/* Author: DHKold */
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/* Contact: admin@dhkold.com */
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/* Date: The 15th of June 2005 */
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/* Version: 2.0B */
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/*********************************************/
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function imagecreatefrombmp($filename) {
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if (! $f1 = fopen($filename,"rb")) return FALSE;
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$FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14));
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if ($FILE['file_type'] != 19778) return FALSE;
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$BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
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'/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
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'/Vvert_resolution/Vcolors_used/Vcolors_important', fread($f1,40));
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$BMP['colors'] = pow(2,$BMP['bits_per_pixel']);
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if ($BMP['size_bitmap'] == 0) $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset'];
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$BMP['bytes_per_pixel'] = $BMP['bits_per_pixel']/8;
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$BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']);
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$BMP['decal'] = ($BMP['width']*$BMP['bytes_per_pixel']/4);
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$BMP['decal'] -= floor($BMP['width']*$BMP['bytes_per_pixel']/4);
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$BMP['decal'] = 4-(4*$BMP['decal']);
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if ($BMP['decal'] == 4) $BMP['decal'] = 0;
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$PALETTE = array();
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if ($BMP['colors'] < 16777216)
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{
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$PALETTE = unpack('V'.$BMP['colors'], fread($f1,$BMP['colors']*4));
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}
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$IMG = fread($f1,$BMP['size_bitmap']);
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$VIDE = chr(0);
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$res = imagecreatetruecolor($BMP['width'],$BMP['height']);
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$P = 0;
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$Y = $BMP['height']-1;
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while ($Y >= 0)
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{
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$X=0;
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while ($X < $BMP['width'])
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{
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if ($BMP['bits_per_pixel'] == 24)
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$COLOR = unpack("V",substr($IMG,$P,3).$VIDE);
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elseif ($BMP['bits_per_pixel'] == 16)
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{
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$COLOR = unpack("n",substr($IMG,$P,2));
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$COLOR[1] = $PALETTE[$COLOR[1]+1];
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}
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elseif ($BMP['bits_per_pixel'] == 8)
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{
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$COLOR = unpack("n",$VIDE.substr($IMG,$P,1));
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$COLOR[1] = $PALETTE[$COLOR[1]+1];
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}
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elseif ($BMP['bits_per_pixel'] == 4)
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{
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$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
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if (($P*2)%2 == 0) $COLOR[1] = ($COLOR[1] >> 4) ; else $COLOR[1] = ($COLOR[1] & 0x0F);
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$COLOR[1] = $PALETTE[$COLOR[1]+1];
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}
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elseif ($BMP['bits_per_pixel'] == 1)
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{
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$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
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if (($P*8)%8 == 0) $COLOR[1] = $COLOR[1] >>7;
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elseif (($P*8)%8 == 1) $COLOR[1] = ($COLOR[1] & 0x40)>>6;
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elseif (($P*8)%8 == 2) $COLOR[1] = ($COLOR[1] & 0x20)>>5;
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elseif (($P*8)%8 == 3) $COLOR[1] = ($COLOR[1] & 0x10)>>4;
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elseif (($P*8)%8 == 4) $COLOR[1] = ($COLOR[1] & 0x8)>>3;
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elseif (($P*8)%8 == 5) $COLOR[1] = ($COLOR[1] & 0x4)>>2;
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elseif (($P*8)%8 == 6) $COLOR[1] = ($COLOR[1] & 0x2)>>1;
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elseif (($P*8)%8 == 7) $COLOR[1] = ($COLOR[1] & 0x1);
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$COLOR[1] = $PALETTE[$COLOR[1]+1];
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}
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else
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return FALSE;
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imagesetpixel($res,$X,$Y,$COLOR[1]);
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$X++;
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$P += $BMP['bytes_per_pixel'];
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}
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$Y--;
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$P+=$BMP['decal'];
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}
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fclose($f1);
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return $res;
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}
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function imagebmp(&$img, $filename='') {
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$widthOrig = imagesx($img);
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$widthFloor = ((floor($widthOrig/16))*16);
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$widthCeil = ((ceil($widthOrig/16))*16);
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$height = imagesy($img);
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$size = ($widthCeil*$height*3)+54;
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// Bitmap File Header
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$result = 'BM'; // header (2b)
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$result .= int_to_dword($size); // size of file (4b)
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$result .= int_to_dword(0); // reserved (4b)
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$result .= int_to_dword(54); // byte location in the file which is first byte of IMAGE (4b)
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// Bitmap Info Header
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$result .= int_to_dword(40); // Size of BITMAPINFOHEADER (4b)
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$result .= int_to_dword($widthCeil); // width of bitmap (4b)
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$result .= int_to_dword($height); // height of bitmap (4b)
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$result .= int_to_word(1); // biPlanes = 1 (2b)
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$result .= int_to_word(24); // biBitCount = {1 (mono) or 4 (16 clr ) or 8 (256 clr) or 24 (16 Mil)} (2b
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$result .= int_to_dword(0); // RLE COMPRESSION (4b)
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$result .= int_to_dword(0); // width x height (4b)
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$result .= int_to_dword(0); // biXPelsPerMeter (4b)
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$result .= int_to_dword(0); // biYPelsPerMeter (4b)
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$result .= int_to_dword(0); // Number of palettes used (4b)
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$result .= int_to_dword(0); // Number of important colour (4b)
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// is faster than chr()
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$arrChr = array();
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for ($i=0; $i<256; $i++){
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$arrChr[$i] = chr($i);
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}
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// creates image data
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$bgfillcolor = array('red'=>0, 'green'=>0, 'blue'=>0);
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// bottom to top - left to right - attention blue green red !!!
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$y=$height-1;
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for ($y2=0; $y2<$height; $y2++) {
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for ($x=0; $x<$widthFloor; ) {
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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$rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y));
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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}
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for ($x=$widthFloor; $x<$widthCeil; $x++) {
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$rgb = ($x<$widthOrig) ? imagecolorsforindex($img, imagecolorat($img, $x, $y)) : $bgfillcolor;
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$result .= $arrChr[$rgb['blue']].$arrChr[$rgb['green']].$arrChr[$rgb['red']];
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}
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$y--;
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}
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// see imagegif
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if ($filename == '') {
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echo $result;
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} else {
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$file = fopen($filename, 'wb');
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fwrite($file, $result);
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fclose($file);
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}
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}
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// imagebmp helpers
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function int_to_dword($n) {
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return chr($n & 255).chr(($n >> 8) & 255).chr(($n >> 16) & 255).chr(($n >> 24) & 255);
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}
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function int_to_word($n) {
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return chr($n & 255).chr(($n >> 8) & 255);
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}
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?>
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