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<?php
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/**
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* Converts BMP to JPG
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*
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* @link https://github.com/dompdf/dompdf/blob/master/src/Helpers.php
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* @link http://www.programmierer-forum.de/function-imagecreatefrombmp-welche-variante-laeuft-t143137.htm
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* @since 4.3.0
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*/
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function bmp_to_image_object( $filename, $context = null ) {
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$filename = wp_kses_post( $filename );
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if (!function_exists("imagecreatetruecolor")) {
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trigger_error("The PHP GD extension is required, but is not installed.", E_ERROR);
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return false;
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}
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// version 1.00
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if (!($fh = fopen($filename, 'rb'))) {
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// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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trigger_error('imagecreatefrombmp: Can not open ' . $filename, E_USER_WARNING);
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return false;
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}
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$bytes_read = 0;
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// read file header
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$meta = unpack('vtype/Vfilesize/Vreserved/Voffset', fread($fh, 14));
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// check for bitmap
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if ($meta['type'] != 19778) {
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// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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trigger_error('imagecreatefrombmp: ' . $filename . ' is not a bitmap!', E_USER_WARNING);
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return false;
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}
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// read image header
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$meta += unpack('Vheadersize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vcolors/Vimportant', fread($fh, 40));
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$bytes_read += 40;
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// read additional bitfield header
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if ($meta['compression'] == 3) {
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$meta += unpack('VrMask/VgMask/VbMask', fread($fh, 12));
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$bytes_read += 12;
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}
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// set bytes and padding
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$meta['bytes'] = $meta['bits'] / 8;
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$meta['decal'] = 4 - (4 * (($meta['width'] * $meta['bytes'] / 4) - floor($meta['width'] * $meta['bytes'] / 4)));
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if ($meta['decal'] == 4) {
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$meta['decal'] = 0;
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}
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// obtain imagesize
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if ($meta['imagesize'] < 1) {
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$meta['imagesize'] = $meta['filesize'] - $meta['offset'];
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// in rare cases filesize is equal to offset so we need to read physical size
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if ($meta['imagesize'] < 1) {
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$meta['imagesize'] = @filesize($filename) - $meta['offset'];
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if ($meta['imagesize'] < 1) {
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// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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trigger_error('imagecreatefrombmp: Can not obtain filesize of ' . $filename . '!', E_USER_WARNING);
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return false;
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}
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}
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}
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// calculate colors
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$meta['colors'] = !$meta['colors'] ? pow(2, $meta['bits']) : $meta['colors'];
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// read color palette
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$palette = [];
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if ($meta['bits'] < 16) {
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$palette = unpack('l' . $meta['colors'], fread($fh, $meta['colors'] * 4));
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// in rare cases the color value is signed
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if ($palette[1] < 0) {
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foreach ($palette as $i => $color) {
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$palette[$i] = $color + 16777216;
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}
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}
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}
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// ignore extra bitmap headers
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if ($meta['headersize'] > $bytes_read) {
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fread($fh, $meta['headersize'] - $bytes_read);
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}
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// create gd image
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$im = imagecreatetruecolor($meta['width'], $meta['height']);
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$data = fread($fh, $meta['imagesize']);
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// uncompress data
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switch ($meta['compression']) {
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case 1:
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$data = Helpers::rle8_decode($data, $meta['width']);
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break;
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case 2:
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$data = Helpers::rle4_decode($data, $meta['width']);
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break;
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}
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$p = 0;
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$vide = chr(0);
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$y = $meta['height'] - 1;
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$error = 'imagecreatefrombmp: ' . $filename . ' has not enough data!';
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// loop through the image data beginning with the lower left corner
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while ($y >= 0) {
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$x = 0;
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while ($x < $meta['width']) {
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switch ($meta['bits']) {
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case 32:
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case 24:
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if (!($part = substr($data, $p, 3 /*$meta['bytes']*/))) {
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// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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trigger_error($error, E_USER_WARNING);
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return $im;
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}
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$color = unpack('V', $part . $vide);
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break;
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case 16:
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if (!($part = substr($data, $p, 2 /*$meta['bytes']*/))) {
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// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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trigger_error($error, E_USER_WARNING);
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return $im;
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}
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$color = unpack('v', $part);
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if (empty($meta['rMask']) || $meta['rMask'] != 0xf800) {
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$color[1] = (($color[1] & 0x7c00) >> 7) * 65536 + (($color[1] & 0x03e0) >> 2) * 256 + (($color[1] & 0x001f) << 3); // 555
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} else {
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$color[1] = (($color[1] & 0xf800) >> 8) * 65536 + (($color[1] & 0x07e0) >> 3) * 256 + (($color[1] & 0x001f) << 3); // 565
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}
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break;
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case 8:
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$color = unpack('n', $vide . substr($data, $p, 1));
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$color[1] = $palette[$color[1] + 1];
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break;
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case 4:
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$color = unpack('n', $vide . substr($data, floor($p), 1));
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$color[1] = ($p * 2) % 2 == 0 ? $color[1] >> 4 : $color[1] & 0x0F;
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$color[1] = $palette[$color[1] + 1];
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break;
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case 1:
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$color = unpack('n', $vide . substr($data, floor($p), 1));
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switch (($p * 8) % 8) {
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case 0:
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$color[1] = $color[1] >> 7;
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break;
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case 1:
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$color[1] = ($color[1] & 0x40) >> 6;
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break;
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case 2:
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$color[1] = ($color[1] & 0x20) >> 5;
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break;
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case 3:
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$color[1] = ($color[1] & 0x10) >> 4;
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break;
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case 4:
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$color[1] = ($color[1] & 0x8) >> 3;
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break;
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case 5:
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$color[1] = ($color[1] & 0x4) >> 2;
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break;
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case 6:
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$color[1] = ($color[1] & 0x2) >> 1;
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break;
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case 7:
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$color[1] = ($color[1] & 0x1);
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break;
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}
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$color[1] = $palette[$color[1] + 1];
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break;
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default:
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// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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trigger_error('imagecreatefrombmp: ' . $filename . ' has ' . $meta['bits'] . ' bits and this is not supported!', E_USER_WARNING);
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return false;
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}
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imagesetpixel($im, $x, $y, $color[1]);
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$x++;
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$p += $meta['bytes'];
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}
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$y--;
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$p += $meta['decal'];
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}
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fclose($fh);
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return $im;
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}
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