phpthumb/phpthumb.bmp.php
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.graphic.bmp.php //
// module for analyzing BMP Image files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
// //
// Modified for use in phpThumb() - James Heinrich 2004.07.27 //
// //
/////////////////////////////////////////////////////////////////
class phpthumb_bmp
{
public function phpthumb_bmp2gd(&$BMPdata, $truecolor = true)
{
$ThisFileInfo = [];
if ($this->getid3_bmp($BMPdata, $ThisFileInfo, true, true)) {
$gd = $this->PlotPixelsGD($ThisFileInfo['bmp'], $truecolor);
return $gd;
}
return false;
}
public function phpthumb_bmpfile2gd($filename, $truecolor = true)
{
if ($fp = @fopen($filename, 'rb')) {
$BMPdata = fread($fp, filesize($filename));
fclose($fp);
return $this->phpthumb_bmp2gd($BMPdata, $truecolor);
}
return false;
}
public function GD2BMPstring(&$gd_image)
{
$imageX = imagesx($gd_image);
$imageY = imagesy($gd_image);
$BMP = '';
for ($y = ($imageY - 1); $y >= 0; $y--) {
$thisline = '';
for ($x = 0; $x < $imageX; $x++) {
$argb = phpthumb_functions::GetPixelColor($gd_image, $x, $y);
$thisline .= chr($argb['blue']) . chr($argb['green']) . chr($argb['red']);
}
while (strlen($thisline) % 4) {
$thisline .= "\x00";
}
$BMP .= $thisline;
}
$bmpSize = strlen($BMP) + 14 + 40;
// BITMAPFILEHEADER [14 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_62uq.asp
$BITMAPFILEHEADER = 'BM'; // WORD bfType;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String($bmpSize, 4); // DWORD bfSize;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String(0, 2); // WORD bfReserved1;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String(0, 2); // WORD bfReserved2;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String(54, 4); // DWORD bfOffBits;
// BITMAPINFOHEADER - [40 bytes] http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp
$BITMAPINFOHEADER = phpthumb_functions::LittleEndian2String(40, 4); // DWORD biSize;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String($imageX, 4); // LONG biWidth;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String($imageY, 4); // LONG biHeight;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(1, 2); // WORD biPlanes;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(24, 2); // WORD biBitCount;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4); // DWORD biCompression;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4); // DWORD biSizeImage;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(2835, 4); // LONG biXPelsPerMeter;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(2835, 4); // LONG biYPelsPerMeter;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4); // DWORD biClrUsed;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4); // DWORD biClrImportant;
return $BITMAPFILEHEADER . $BITMAPINFOHEADER . $BMP;
}
public function getid3_bmp(&$BMPdata, &$ThisFileInfo, $ExtractPalette = false, $ExtractData = false)
{
// shortcuts
$ThisFileInfo['bmp']['header']['raw'] = [];
$thisfile_bmp = &$ThisFileInfo['bmp'];
$thisfile_bmp_header = &$thisfile_bmp['header'];
$thisfile_bmp_header_raw = &$thisfile_bmp_header['raw'];
// BITMAPFILEHEADER [14 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_62uq.asp
// all versions
// WORD bfType;
// DWORD bfSize;
// WORD bfReserved1;
// WORD bfReserved2;
// DWORD bfOffBits;
$offset = 0;
$overalloffset = 0;
$BMPheader = substr($BMPdata, $overalloffset, 14 + 40);
$overalloffset += (14 + 40);
$thisfile_bmp_header_raw['identifier'] = substr($BMPheader, $offset, 2);
$offset += 2;
if ($thisfile_bmp_header_raw['identifier'] != 'BM') {
$ThisFileInfo['error'][] = 'Expecting "BM" at offset ' . (int)(@$ThisFileInfo['avdataoffset']) . ', found "' . $thisfile_bmp_header_raw['identifier'] . '"';
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['bmp']);
return false;
}
$thisfile_bmp_header_raw['filesize'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['reserved1'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['reserved2'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['data_offset'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['header_size'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
// check if the hardcoded-to-1 "planes" is at offset 22 or 26
$planes22 = $this->LittleEndian2Int(substr($BMPheader, 22, 2));
$planes26 = $this->LittleEndian2Int(substr($BMPheader, 26, 2));
if (($planes22 == 1) && ($planes26 != 1)) {
$thisfile_bmp['type_os'] = 'OS/2';
$thisfile_bmp['type_version'] = 1;
} elseif (($planes26 == 1) && ($planes22 != 1)) {
$thisfile_bmp['type_os'] = 'Windows';
$thisfile_bmp['type_version'] = 1;
} elseif ($thisfile_bmp_header_raw['header_size'] == 12) {
$thisfile_bmp['type_os'] = 'OS/2';
$thisfile_bmp['type_version'] = 1;
} elseif ($thisfile_bmp_header_raw['header_size'] == 40) {
$thisfile_bmp['type_os'] = 'Windows';
$thisfile_bmp['type_version'] = 1;
} elseif ($thisfile_bmp_header_raw['header_size'] == 84) {
$thisfile_bmp['type_os'] = 'Windows';
$thisfile_bmp['type_version'] = 4;
} elseif ($thisfile_bmp_header_raw['header_size'] == 100) {
$thisfile_bmp['type_os'] = 'Windows';
$thisfile_bmp['type_version'] = 5;
} else {
$ThisFileInfo['error'][] = 'Unknown BMP subtype (or not a BMP file)';
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['bmp']);
return false;
}
$ThisFileInfo['fileformat'] = 'bmp';
$ThisFileInfo['video']['dataformat'] = 'bmp';
$ThisFileInfo['video']['lossless'] = true;
$ThisFileInfo['video']['pixel_aspect_ratio'] = (float)1;
if ($thisfile_bmp['type_os'] == 'OS/2') {
// OS/2-format BMP
// http://netghost.narod.ru/gff/graphics/summary/os2bmp.htm
// DWORD Size; /* Size of this structure in bytes */
// DWORD Width; /* Bitmap width in pixels */
// DWORD Height; /* Bitmap height in pixel */
// WORD NumPlanes; /* Number of bit planes (color depth) */
// WORD BitsPerPixel; /* Number of bits per pixel per plane */
$thisfile_bmp_header_raw['width'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['height'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['planes'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['bits_per_pixel'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$ThisFileInfo['video']['resolution_x'] = $thisfile_bmp_header_raw['width'];
$ThisFileInfo['video']['resolution_y'] = $thisfile_bmp_header_raw['height'];
$ThisFileInfo['video']['codec'] = 'BI_RGB ' . $thisfile_bmp_header_raw['bits_per_pixel'] . '-bit';
$ThisFileInfo['video']['bits_per_sample'] = $thisfile_bmp_header_raw['bits_per_pixel'];
if ($thisfile_bmp['type_version'] >= 2) {
// DWORD Compression; /* Bitmap compression scheme */
// DWORD ImageDataSize; /* Size of bitmap data in bytes */
// DWORD XResolution; /* X resolution of display device */
// DWORD YResolution; /* Y resolution of display device */
// DWORD ColorsUsed; /* Number of color table indices used */
// DWORD ColorsImportant; /* Number of important color indices */
// WORD Units; /* Type of units used to measure resolution */
// WORD Reserved; /* Pad structure to 4-byte boundary */
// WORD Recording; /* Recording algorithm */
// WORD Rendering; /* Halftoning algorithm used */
// DWORD Size1; /* Reserved for halftoning algorithm use */
// DWORD Size2; /* Reserved for halftoning algorithm use */
// DWORD ColorEncoding; /* Color model used in bitmap */
// DWORD Identifier; /* Reserved for application use */
$thisfile_bmp_header_raw['compression'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['bmp_data_size'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['resolution_h'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['resolution_v'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['colors_used'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['colors_important'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['resolution_units'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['reserved1'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['recording'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['rendering'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['size1'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['size2'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['color_encoding'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['identifier'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header['compression'] = $this->BMPcompressionOS2Lookup($thisfile_bmp_header_raw['compression']);
$ThisFileInfo['video']['codec'] = $thisfile_bmp_header['compression'] . ' ' . $thisfile_bmp_header_raw['bits_per_pixel'] . '-bit';
}
} elseif ($thisfile_bmp['type_os'] == 'Windows') {
// Windows-format BMP
// BITMAPINFOHEADER - [40 bytes] http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp
// all versions
// DWORD biSize;
// LONG biWidth;
// LONG biHeight;
// WORD biPlanes;
// WORD biBitCount;
// DWORD biCompression;
// DWORD biSizeImage;
// LONG biXPelsPerMeter;
// LONG biYPelsPerMeter;
// DWORD biClrUsed;
// DWORD biClrImportant;
$thisfile_bmp_header_raw['width'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['height'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['planes'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['bits_per_pixel'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 2));
$offset += 2;
$thisfile_bmp_header_raw['compression'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['bmp_data_size'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['resolution_h'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['resolution_v'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['colors_used'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['colors_important'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header['compression'] = $this->BMPcompressionWindowsLookup($thisfile_bmp_header_raw['compression']);
$ThisFileInfo['video']['resolution_x'] = $thisfile_bmp_header_raw['width'];
$ThisFileInfo['video']['resolution_y'] = $thisfile_bmp_header_raw['height'];
$ThisFileInfo['video']['codec'] = $thisfile_bmp_header['compression'] . ' ' . $thisfile_bmp_header_raw['bits_per_pixel'] . '-bit';
$ThisFileInfo['video']['bits_per_sample'] = $thisfile_bmp_header_raw['bits_per_pixel'];
if (($thisfile_bmp['type_version'] >= 4) || ($thisfile_bmp_header_raw['compression'] == 3)) {
// should only be v4+, but BMPs with type_version==1 and BI_BITFIELDS compression have been seen
$BMPheader .= substr($BMPdata, $overalloffset, 44);
$overalloffset += 44;
// BITMAPV4HEADER - [44 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_2k1e.asp
// Win95+, WinNT4.0+
// DWORD bV4RedMask;
// DWORD bV4GreenMask;
// DWORD bV4BlueMask;
// DWORD bV4AlphaMask;
// DWORD bV4CSType;
// CIEXYZTRIPLE bV4Endpoints;
// DWORD bV4GammaRed;
// DWORD bV4GammaGreen;
// DWORD bV4GammaBlue;
$thisfile_bmp_header_raw['red_mask'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['green_mask'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['blue_mask'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['alpha_mask'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['cs_type'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['ciexyz_red'] = substr($BMPheader, $offset, 4);
$offset += 4;
$thisfile_bmp_header_raw['ciexyz_green'] = substr($BMPheader, $offset, 4);
$offset += 4;
$thisfile_bmp_header_raw['ciexyz_blue'] = substr($BMPheader, $offset, 4);
$offset += 4;
$thisfile_bmp_header_raw['gamma_red'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['gamma_green'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['gamma_blue'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header['ciexyz_red'] = $this->FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_red']));
$thisfile_bmp_header['ciexyz_green'] = $this->FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_green']));
$thisfile_bmp_header['ciexyz_blue'] = $this->FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_blue']));
}
if ($thisfile_bmp['type_version'] >= 5) {
$BMPheader .= substr($BMPdata, $overalloffset, 16);
$overalloffset += 16;
// BITMAPV5HEADER - [16 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_7c36.asp
// Win98+, Win2000+
// DWORD bV5Intent;
// DWORD bV5ProfileData;
// DWORD bV5ProfileSize;
// DWORD bV5Reserved;
$thisfile_bmp_header_raw['intent'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['profile_data_offset'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['profile_data_size'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
$thisfile_bmp_header_raw['reserved3'] = $this->LittleEndian2Int(substr($BMPheader, $offset, 4));
$offset += 4;
}
} else {
$ThisFileInfo['error'][] = 'Unknown BMP format in header.';
return false;
}
if ($ExtractPalette || $ExtractData) {
$PaletteEntries = 0;
if ($thisfile_bmp_header_raw['bits_per_pixel'] < 16) {
$PaletteEntries = pow(2, $thisfile_bmp_header_raw['bits_per_pixel']);
} elseif (isset($thisfile_bmp_header_raw['colors_used']) && ($thisfile_bmp_header_raw['colors_used'] > 0) && ($thisfile_bmp_header_raw['colors_used'] <= 256)) {
$PaletteEntries = $thisfile_bmp_header_raw['colors_used'];
}
if ($PaletteEntries > 0) {
$BMPpalette = substr($BMPdata, $overalloffset, 4 * $PaletteEntries);
$overalloffset += 4 * $PaletteEntries;
$paletteoffset = 0;
for ($i = 0; $i < $PaletteEntries; $i++) {
// RGBQUAD - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_5f8y.asp
// BYTE rgbBlue;
// BYTE rgbGreen;
// BYTE rgbRed;
// BYTE rgbReserved;
$blue = $this->LittleEndian2Int($BMPpalette[$paletteoffset++]);
$green = $this->LittleEndian2Int($BMPpalette[$paletteoffset++]);
$red = $this->LittleEndian2Int($BMPpalette[$paletteoffset++]);
if (($thisfile_bmp['type_os'] == 'OS/2') && ($thisfile_bmp['type_version'] == 1)) {
// no padding byte
} else {
$paletteoffset++; // padding byte
}
$thisfile_bmp['palette'][$i] = (($red << 16) | ($green << 8) | $blue);
}
}
}
if ($ExtractData) {
$RowByteLength = ceil(($thisfile_bmp_header_raw['width'] * ($thisfile_bmp_header_raw['bits_per_pixel'] / 8)) / 4) * 4; // round up to nearest DWORD boundary
$BMPpixelData = substr($BMPdata, $thisfile_bmp_header_raw['data_offset'], $thisfile_bmp_header_raw['height'] * $RowByteLength);
$overalloffset = $thisfile_bmp_header_raw['data_offset'] + ($thisfile_bmp_header_raw['height'] * $RowByteLength);
$pixeldataoffset = 0;
switch (@$thisfile_bmp_header_raw['compression']) {
case 0: // BI_RGB
switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
case 1:
for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) {
$paletteindexbyte = ord($BMPpixelData[$pixeldataoffset++]);
for ($i = 7; $i >= 0; $i--) {
$paletteindex = ($paletteindexbyte & (0x01 << $i)) >> $i;
$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
$col++;
}
}
while (($pixeldataoffset % 4) != 0) {
// lines are padded to nearest DWORD
$pixeldataoffset++;
}
}
break;
case 4:
for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) {
$paletteindexbyte = ord($BMPpixelData[$pixeldataoffset++]);
for ($i = 1; $i >= 0; $i--) {
$paletteindex = ($paletteindexbyte & (0x0F << (4 * $i))) >> (4 * $i);
$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
$col++;
}
}
while (($pixeldataoffset % 4) != 0) {
// lines are padded to nearest DWORD
$pixeldataoffset++;
}
}
break;
case 8:
for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
$paletteindex = ord($BMPpixelData[$pixeldataoffset++]);
$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
}
while (($pixeldataoffset % 4) != 0) {
// lines are padded to nearest DWORD
$pixeldataoffset++;
}
}
break;
case 24:
for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
$thisfile_bmp['data'][$row][$col] = (ord($BMPpixelData[$pixeldataoffset + 2]) << 16) | (ord($BMPpixelData[$pixeldataoffset + 1]) << 8) | ord($BMPpixelData[$pixeldataoffset]);
$pixeldataoffset += 3;
}
while (($pixeldataoffset % 4) != 0) {
// lines are padded to nearest DWORD
$pixeldataoffset++;
}
}
break;
case 32:
for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
$thisfile_bmp['data'][$row][$col] = (ord($BMPpixelData[$pixeldataoffset + 3]) << 24) | (ord($BMPpixelData[$pixeldataoffset + 2]) << 16) | (ord($BMPpixelData[$pixeldataoffset + 1]) << 8) | ord($BMPpixelData[$pixeldataoffset]);
$pixeldataoffset += 4;
}
while (($pixeldataoffset % 4) != 0) {
// lines are padded to nearest DWORD
$pixeldataoffset++;
}
}
break;
case 16:
// ?
break;
default:
$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data';
break;
}
break;
case 1: // BI_RLE8 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp
switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
case 8:
$pixelcounter = 0;
while ($pixeldataoffset < strlen($BMPpixelData)) {
$firstbyte = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$secondbyte = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
if ($firstbyte == 0) {
// escaped/absolute mode - the first byte of the pair can be set to zero to
// indicate an escape character that denotes the end of a line, the end of
// a bitmap, or a delta, depending on the value of the second byte.
switch ($secondbyte) {
case 0:
// end of line
// no need for special processing, just ignore
break;
case 1:
// end of bitmap
$pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case
break;
case 2:
// delta - The 2 bytes following the escape contain unsigned values
// indicating the horizontal and vertical offsets of the next pixel
// from the current position.
$colincrement = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$rowincrement = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$col = ($pixelcounter % $thisfile_bmp_header_raw['width']) + $colincrement;
$row = ($thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width'])) - $rowincrement;
$pixelcounter = ($row * $thisfile_bmp_header_raw['width']) + $col;
break;
default:
// In absolute mode, the first byte is zero and the second byte is a
// value in the range 03H through FFH. The second byte represents the
// number of bytes that follow, each of which contains the color index
// of a single pixel. Each run must be aligned on a word boundary.
for ($i = 0; $i < $secondbyte; $i++) {
$paletteindex = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
$pixelcounter++;
}
while (($pixeldataoffset % 2) != 0) {
// Each run must be aligned on a word boundary.
$pixeldataoffset++;
}
break;
}
} else {
// encoded mode - the first byte specifies the number of consecutive pixels
// to be drawn using the color index contained in the second byte.
for ($i = 0; $i < $firstbyte; $i++) {
$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$secondbyte];
$pixelcounter++;
}
}
}
break;
default:
$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data';
break;
}
break;
case 2: // BI_RLE4 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp
switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
case 4:
$pixelcounter = 0;
while ($pixeldataoffset < strlen($BMPpixelData)) {
$firstbyte = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$secondbyte = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
if ($firstbyte == 0) {
// escaped/absolute mode - the first byte of the pair can be set to zero to
// indicate an escape character that denotes the end of a line, the end of
// a bitmap, or a delta, depending on the value of the second byte.
switch ($secondbyte) {
case 0:
// end of line
// no need for special processing, just ignore
break;
case 1:
// end of bitmap
$pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case
break;
case 2:
// delta - The 2 bytes following the escape contain unsigned values
// indicating the horizontal and vertical offsets of the next pixel
// from the current position.
$colincrement = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$rowincrement = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$col = ($pixelcounter % $thisfile_bmp_header_raw['width']) + $colincrement;
$row = ($thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width'])) - $rowincrement;
$pixelcounter = ($row * $thisfile_bmp_header_raw['width']) + $col;
break;
default:
// In absolute mode, the first byte is zero. The second byte contains the number
// of color indexes that follow. Subsequent bytes contain color indexes in their
// high- and low-order 4 bits, one color index for each pixel. In absolute mode,
// each run must be aligned on a word boundary.
$paletteindexes = [];
for ($i = 0, $iMax = ceil($secondbyte / 2); $i < $iMax; $i++) {
$paletteindexbyte = $this->LittleEndian2Int($BMPpixelData[$pixeldataoffset++]);
$paletteindexes[] = ($paletteindexbyte & 0xF0) >> 4;
$paletteindexes[] = ($paletteindexbyte & 0x0F);
}
while (($pixeldataoffset % 2) != 0) {
// Each run must be aligned on a word boundary.
$pixeldataoffset++;
}
foreach ($paletteindexes as $dummy => $paletteindex) {
$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
$pixelcounter++;
}
break;
}
} else {
// encoded mode - the first byte of the pair contains the number of pixels to be
// drawn using the color indexes in the second byte. The second byte contains two
// color indexes, one in its high-order 4 bits and one in its low-order 4 bits.
// The first of the pixels is drawn using the color specified by the high-order
// 4 bits, the second is drawn using the color in the low-order 4 bits, the third
// is drawn using the color in the high-order 4 bits, and so on, until all the
// pixels specified by the first byte have been drawn.
$paletteindexes[0] = ($secondbyte & 0xF0) >> 4;
$paletteindexes[1] = ($secondbyte & 0x0F);
for ($i = 0; $i < $firstbyte; $i++) {
$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindexes[$i % 2]];
$pixelcounter++;
}
}
}
break;
default:
$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data';
break;
}
break;
case 3: // BI_BITFIELDS
switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
case 16:
case 32:
$redshift = 0;
$greenshift = 0;
$blueshift = 0;
if (!$thisfile_bmp_header_raw['red_mask'] || !$thisfile_bmp_header_raw['green_mask'] || !$thisfile_bmp_header_raw['blue_mask']) {
$ThisFileInfo['error'][] = 'missing $thisfile_bmp_header_raw[(red|green|blue)_mask]';
return false;
}
while ((($thisfile_bmp_header_raw['red_mask'] >> $redshift) & 0x01) == 0) {
$redshift++;
}
while ((($thisfile_bmp_header_raw['green_mask'] >> $greenshift) & 0x01) == 0) {
$greenshift++;
}
while ((($thisfile_bmp_header_raw['blue_mask'] >> $blueshift) & 0x01) == 0) {
$blueshift++;
}
for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
$pixelvalue = $this->LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset, $thisfile_bmp_header_raw['bits_per_pixel'] / 8));
$pixeldataoffset += $thisfile_bmp_header_raw['bits_per_pixel'] / 8;
$red = (int)round(((($pixelvalue & $thisfile_bmp_header_raw['red_mask']) >> $redshift) / ($thisfile_bmp_header_raw['red_mask'] >> $redshift)) * 255);
$green = (int)round(((($pixelvalue & $thisfile_bmp_header_raw['green_mask']) >> $greenshift) / ($thisfile_bmp_header_raw['green_mask'] >> $greenshift)) * 255);
$blue = (int)round(((($pixelvalue & $thisfile_bmp_header_raw['blue_mask']) >> $blueshift) / ($thisfile_bmp_header_raw['blue_mask'] >> $blueshift)) * 255);
$thisfile_bmp['data'][$row][$col] = (($red << 16) | ($green << 8) | $blue);
}
while (($pixeldataoffset % 4) != 0) {
// lines are padded to nearest DWORD
$pixeldataoffset++;
}
}
break;
default:
$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data';
break;
}
break;
default: // unhandled compression type
$ThisFileInfo['error'][] = 'Unknown/unhandled compression type value (' . $thisfile_bmp_header_raw['compression'] . ') - cannot decompress pixel data';
break;
}
}
return true;
}
public function IntColor2RGB($color)
{
$red = ($color & 0x00FF0000) >> 16;
$green = ($color & 0x0000FF00) >> 8;
$blue = ($color & 0x000000FF);
return [$red, $green, $blue];
}
public function PlotPixelsGD(&$BMPdata, $truecolor = true)
{
$imagewidth = $BMPdata['header']['raw']['width'];
$imageheight = $BMPdata['header']['raw']['height'];
if ($truecolor) {
$gd = @imagecreatetruecolor($imagewidth, $imageheight);
} else {
$gd = @imagecreate($imagewidth, $imageheight);
if (!empty($BMPdata['palette'])) {
// create GD palette from BMP palette
foreach ($BMPdata['palette'] as $dummy => $color) {
[$r, $g, $b] = $this->IntColor2RGB($color);
imagecolorallocate($gd, $r, $g, $b);
}
} else {
// create 216-color websafe palette
for ($r = 0x00; $r <= 0xFF; $r += 0x33) {
for ($g = 0x00; $g <= 0xFF; $g += 0x33) {
for ($b = 0x00; $b <= 0xFF; $b += 0x33) {
imagecolorallocate($gd, $r, $g, $b);
}
}
}
}
}
if (!is_resource($gd) && !(is_object($gd) && $gd instanceof \GdImage)) {
return false;
}
foreach ($BMPdata['data'] as $row => $colarray) {
if (!phpthumb_functions::FunctionIsDisabled('set_time_limit')) {
set_time_limit(30);
}
foreach ($colarray as $col => $color) {
[$red, $green, $blue] = $this->IntColor2RGB($color);
if ($truecolor) {
$pixelcolor = imagecolorallocate($gd, $red, $green, $blue);
} else {
$pixelcolor = imagecolorclosest($gd, $red, $green, $blue);
}
imagesetpixel($gd, $col, $row, $pixelcolor);
}
}
return $gd;
}
public function PlotBMP(&$BMPinfo)
{
$starttime = time();
if (!isset($BMPinfo['bmp']['data']) || !is_array($BMPinfo['bmp']['data'])) {
echo 'ERROR: no pixel data<BR>';
return false;
}
if (!phpthumb_functions::FunctionIsDisabled('set_time_limit')) {
set_time_limit((int)round($BMPinfo['resolution_x'] * $BMPinfo['resolution_y'] / 10000));
}
$im = $this->PlotPixelsGD($BMPinfo['bmp']);
if (headers_sent()) {
echo 'plotted ' . ($BMPinfo['resolution_x'] * $BMPinfo['resolution_y']) . ' pixels in ' . (time() - $starttime) . ' seconds<BR>';
imagedestroy($im);
exit;
}
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
return true;
}
public function BMPcompressionWindowsLookup($compressionid)
{
static $BMPcompressionWindowsLookup = [
0 => 'BI_RGB',
1 => 'BI_RLE8',
2 => 'BI_RLE4',
3 => 'BI_BITFIELDS',
4 => 'BI_JPEG',
5 => 'BI_PNG',
];
return (isset($BMPcompressionWindowsLookup[$compressionid]) ? $BMPcompressionWindowsLookup[$compressionid] : 'invalid');
}
public function BMPcompressionOS2Lookup($compressionid)
{
static $BMPcompressionOS2Lookup = [
0 => 'BI_RGB',
1 => 'BI_RLE8',
2 => 'BI_RLE4',
3 => 'Huffman 1D',
4 => 'BI_RLE24',
];
return (isset($BMPcompressionOS2Lookup[$compressionid]) ? $BMPcompressionOS2Lookup[$compressionid] : 'invalid');
}
// from getid3.lib.php
public function trunc($floatnumber)
{
// truncates a floating-point number at the decimal point
// returns int (if possible, otherwise float)
if ($floatnumber >= 1) {
$truncatednumber = floor($floatnumber);
} elseif ($floatnumber <= -1) {
$truncatednumber = ceil($floatnumber);
} else {
$truncatednumber = 0;
}
if ($truncatednumber <= 1073741824) { // 2^30
$truncatednumber = (int)$truncatednumber;
}
return $truncatednumber;
}
public function LittleEndian2Int($byteword)
{
$intvalue = 0;
$byteword = strrev($byteword);
$bytewordlen = strlen($byteword);
for ($i = 0; $i < $bytewordlen; $i++) {
$intvalue += ord($byteword[$i]) * pow(256, $bytewordlen - 1 - $i);
}
return $intvalue;
}
public function BigEndian2Int($byteword)
{
return $this->LittleEndian2Int(strrev($byteword));
}
public function BigEndian2Bin($byteword)
{
$binvalue = '';
$bytewordlen = strlen($byteword);
for ($i = 0; $i < $bytewordlen; $i++) {
$binvalue .= str_pad(decbin(ord($byteword[$i])), 8, '0', STR_PAD_LEFT);
}
return $binvalue;
}
public function FixedPoint2_30($rawdata)
{
$binarystring = $this->BigEndian2Bin($rawdata);
return $this->Bin2Dec(substr($binarystring, 0, 2)) + (float)($this->Bin2Dec(substr($binarystring, 2, 30)) / 1073741824);
}
public function Bin2Dec($binstring, $signed = false)
{
$signmult = 1;
if ($signed) {
if ($binstring[0] == '1') {
$signmult = -1;
}
$binstring = substr($binstring, 1);
}
$decvalue = 0;
for ($i = 0, $iMax = strlen($binstring); $i < $iMax; $i++) {
$decvalue += ((int)$binstring[strlen($binstring) - $i - 1]) * pow(2, $i);
}
return $this->CastAsInt($decvalue * $signmult);
}
public function CastAsInt($floatnum)
{
// convert to float if not already
$floatnum = (float)$floatnum;
// convert a float to type int, only if possible
if ($this->trunc($floatnum) == $floatnum) {
// it's not floating point
if ($floatnum <= 1073741824) { // 2^30
// it's within int range
$floatnum = (int)$floatnum;
}
}
return $floatnum;
}
}