1<?php
2//////////////////////////////////////////////////////////////
3//   phpThumb() by James Heinrich <info@silisoftware.com>   //
4//        available at http://phpthumb.sourceforge.net      //
5//         and/or https://github.com/JamesHeinrich/phpThumb //
6//////////////////////////////////////////////////////////////
7///                                                         //
8// phpthumb.ico.php - .ICO output format functions          //
9//                                                         ///
10//////////////////////////////////////////////////////////////
11
12
13class phpthumb_ico {
14
15	public function GD2ICOstring(&$gd_image_array) {
16		$ImageWidths  = array();
17		$ImageHeights = array();
18		$bpp          = array();
19		$totalcolors  = array();
20		$icXOR        = array();
21		$icAND        = array();
22		$icANDmask    = array();
23		foreach ($gd_image_array as $key => $gd_image) {
24
25			$ImageWidths[$key]  = imagesx($gd_image);
26			$ImageHeights[$key] = imagesy($gd_image);
27			$bpp[$key]          = imageistruecolor($gd_image) ? 32 : 24;
28			$totalcolors[$key]  = imagecolorstotal($gd_image);
29
30			$icXOR[$key] = '';
31			for ($y = $ImageHeights[$key] - 1; $y >= 0; $y--) {
32				for ($x = 0; $x < $ImageWidths[$key]; $x++) {
33					$argb = phpthumb_functions::GetPixelColor($gd_image, $x, $y);
34					$a = round(255 * ((127 - $argb['alpha']) / 127));
35					$r = $argb['red'];
36					$g = $argb['green'];
37					$b = $argb['blue'];
38
39					if ($bpp[$key] == 32) {
40						$icXOR[$key] .= chr($b).chr($g).chr($r).chr($a);
41					} elseif ($bpp[$key] == 24) {
42						$icXOR[$key] .= chr($b).chr($g).chr($r);
43					}
44
45					if ($a < 128) {
46						@$icANDmask[$key][$y] .= '1';
47					} else {
48						@$icANDmask[$key][$y] .= '0';
49					}
50				}
51				// mask bits are 32-bit aligned per scanline
52				while (strlen($icANDmask[$key][$y]) % 32) {
53					$icANDmask[$key][$y] .= '0';
54				}
55			}
56			$icAND[$key] = '';
57			foreach ($icANDmask[$key] as $y => $scanlinemaskbits) {
58				for ($i = 0, $iMax = strlen($scanlinemaskbits); $i < $iMax; $i += 8) {
59					$icAND[$key] .= chr(bindec(str_pad(substr($scanlinemaskbits, $i, 8), 8, '0', STR_PAD_LEFT)));
60				}
61			}
62
63		}
64
65		foreach ($gd_image_array as $key => $gd_image) {
66			$biSizeImage = $ImageWidths[$key] * $ImageHeights[$key] * ($bpp[$key] / 8);
67
68			// BITMAPINFOHEADER - 40 bytes
69			$BitmapInfoHeader[$key]  = '';
70			$BitmapInfoHeader[$key] .= "\x28\x00\x00\x00";                              // DWORD  biSize;
71			$BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($ImageWidths[$key], 4);      // LONG   biWidth;
72			// The biHeight member specifies the combined
73			// height of the XOR and AND masks.
74			$BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($ImageHeights[$key] * 2, 4); // LONG   biHeight;
75			$BitmapInfoHeader[$key] .= "\x01\x00";                                      // WORD   biPlanes;
76			$BitmapInfoHeader[$key] .= chr($bpp[$key])."\x00";                          // wBitCount;
77			$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // DWORD  biCompression;
78			$BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($biSizeImage, 4);            // DWORD  biSizeImage;
79			$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // LONG   biXPelsPerMeter;
80			$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // LONG   biYPelsPerMeter;
81			$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // DWORD  biClrUsed;
82			$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // DWORD  biClrImportant;
83		}
84
85
86		$icondata  = "\x00\x00";                                      // idReserved;   // Reserved (must be 0)
87		$icondata .= "\x01\x00";                                      // idType;       // Resource Type (1 for icons)
88		$icondata .= phpthumb_functions::LittleEndian2String(count($gd_image_array), 2);  // idCount;      // How many images?
89
90		$dwImageOffset = 6 + (count($gd_image_array) * 16);
91		foreach ($gd_image_array as $key => $gd_image) {
92			// ICONDIRENTRY   idEntries[1]; // An entry for each image (idCount of 'em)
93
94			$icondata .= chr($ImageWidths[$key]);                     // bWidth;          // Width, in pixels, of the image
95			$icondata .= chr($ImageHeights[$key]);                    // bHeight;         // Height, in pixels, of the image
96			$icondata .= chr($totalcolors[$key]);                     // bColorCount;     // Number of colors in image (0 if >=8bpp)
97			$icondata .= "\x00";                                      // bReserved;       // Reserved ( must be 0)
98
99			$icondata .= "\x01\x00";                                  // wPlanes;         // Color Planes
100			$icondata .= chr($bpp[$key])."\x00";                      // wBitCount;       // Bits per pixel
101
102			$dwBytesInRes = 40 + strlen($icXOR[$key]) + strlen($icAND[$key]);
103			$icondata .= phpthumb_functions::LittleEndian2String($dwBytesInRes, 4);       // dwBytesInRes;    // How many bytes in this resource?
104
105			$icondata .= phpthumb_functions::LittleEndian2String($dwImageOffset, 4);      // dwImageOffset;   // Where in the file is this image?
106			$dwImageOffset += strlen($BitmapInfoHeader[$key]);
107			$dwImageOffset += strlen($icXOR[$key]);
108			$dwImageOffset += strlen($icAND[$key]);
109		}
110
111		foreach ($gd_image_array as $key => $gd_image) {
112			$icondata .= $BitmapInfoHeader[$key];
113			$icondata .= $icXOR[$key];
114			$icondata .= $icAND[$key];
115		}
116
117		return $icondata;
118	}
119
120}
121