php在线生成icon图标类

<?php 
////////////////////////////////////////////////////////////// 
///  phpThumb() by James Heinrich <info@silisoftware.com>   // 
//        available at http://phpthumb.sourceforge.net     /// 
////////////////////////////////////////////////////////////// 
///                                                         // 
// phpthumb.ico.php - .ICO output format functions          // 
//                                                         /// 
////////////////////////////////////////////////////////////// 

class phpthumb_ico { 

    function phpthumb_ico() { 
        return true; 
    } 

    function GD2ICOstring(&$gd_image_array) { 
        foreach ($gd_image_array as $key => $gd_image) { 

            $ImageWidths[$key]  = ImageSX($gd_image); 
            $ImageHeights[$key] = ImageSY($gd_image); 
            $bpp[$key]          = ImageIsTrueColor($gd_image) ? 32 : 24; 
            $totalcolors[$key]  = ImageColorsTotal($gd_image); 

            $icXOR[$key] = ''; 
            for ($y = $ImageHeights[$key] - 1; $y >= 0; $y--) { 
                for ($x = 0; $x < $ImageWidths[$key]; $x++) { 
                    $argb = phpthumb_functions::GetPixelColor($gd_image, $x, $y); 
                    $a = round(255 * ((127 - $argb['alpha']) / 127)); 
                    $r = $argb['red']; 
                    $g = $argb['green']; 
                    $b = $argb['blue']; 

                    if ($bpp[$key] == 32) { 
                        $icXOR[$key] .= chr($b).chr($g).chr($r).chr($a); 
                    } elseif ($bpp[$key] == 24) { //开源OSPhP.COM.CN 
                        $icXOR[$key] .= chr($b).chr($g).chr($r); 
                    } 

                    if ($a < 128) { 
                        @$icANDmask[$key][$y] .= '1'; 
                    } else { 
                        @$icANDmask[$key][$y] .= '0'; 
                    } 
                } 
                // mask bits are 32-bit aligned per scanline 
                while (strlen($icANDmask[$key][$y]) % 32) { 
                    $icANDmask[$key][$y] .= '0'; 
                } 
            } 
            $icAND[$key] = ''; 
            foreach ($icANDmask[$key] as $y => $scanlinemaskbits) { 
                for ($i = 0; $i < strlen($scanlinemaskbits); $i += 8) { 
                    $icAND[$key] .= chr(bindec(str_pad(substr($scanlinemaskbits, $i, 8), 8, '0', STR_PAD_LEFT))); 
                } 
            } 

        } 

        foreach ($gd_image_array as $key => $gd_image) { 
            $biSizeImage = $ImageWidths[$key] * $ImageHeights[$key] * ($bpp[$key] / 8); 

            // BITMAPINFOHEADER - 40 bytes 
            $BitmapInfoHeader[$key]  = ''; 
            $BitmapInfoHeader[$key] .= "x28x00x00x00";                              // DWORD  biSize; 
            $BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($ImageWidths[$key], 4);      // LONG   biWidth; 
            // The biHeight member specifies the combined 
            // height of the XOR and AND masks. 
            $BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($ImageHeights[$key] * 2, 4); // LONG   biHeight; 
            $BitmapInfoHeader[$key] .= "x01x00";                                      // WORD   biPlanes; 
               $BitmapInfoHeader[$key] .= chr($bpp[$key])."x00";                          // wBitCount; 
            $BitmapInfoHeader[$key] .= "x00x00x00x00";                              // DWORD  biCompression; 
            $BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($biSizeImage, 4);            // DWORD  biSizeImage; 
            $BitmapInfoHeader[$key] .= "x00x00x00x00";                              // LONG   biXPelsPerMeter; 
            $BitmapInfoHeader[$key] .= "x00x00x00x00";                              // LONG   biYPelsPerMeter; 
            $BitmapInfoHeader[$key] .= "x00x00x00x00";                              // DWORD  biClrUsed; //开源OSPhP.COM.CN 
            $BitmapInfoHeader[$key] .= "x00x00x00x00";                              // DWORD  biClrImportant; 
        } 

        $icondata  = "x00x00";                                      // idReserved;   // Reserved (must be 0) 
        $icondata .= "x01x00";                                      // idType;       // Resource Type (1 for icons) 
        $icondata .= phpthumb_functions::LittleEndian2String(count($gd_image_array), 2);  // idCount;      // How many images? 

        $dwImageOffset = 6 + (count($gd_image_array) * 16); 
        foreach ($gd_image_array as $key => $gd_image) { 
            // ICONDIRENTRY   idEntries[1]; // An entry for each image (idCount of 'em) //OSPHP.COm.CN 

            $icondata .= chr($ImageWidths[$key]);                     // bWidth;          // Width, in pixels, of the image 
            $icondata .= chr($ImageHeights[$key]);                    // bHeight;         // Height, in pixels, of the image 
            $icondata .= chr($totalcolors[$key]);                     // bColorCount;     // Number of colors in image (0 if >=8bpp) 
            $icondata .= "x00";                                      // bReserved;       // Reserved ( must be 0) 

            $icondata .= "x01x00";                                  // wPlanes;         // Color Planes 
            $icondata .= chr($bpp[$key])."x00";                      // wBitCount;       // Bits per pixel 

            $dwBytesInRes = 40 + strlen($icXOR[$key]) + strlen($icAND[$key]); 
            $icondata .= phpthumb_functions::LittleEndian2String($dwBytesInRes, 4);       // dwBytesInRes;    // How many bytes in this resource? //开源代码OSPHP.COM.Cn 

            $icondata .= phpthumb_functions::LittleEndian2String($dwImageOffset, 4);      // dwImageOffset;   // Where in the file is this image? 
            $dwImageOffset += strlen($BitmapInfoHeader[$key]); 
            $dwImageOffset += strlen($icXOR[$key]); 
            $dwImageOffset += strlen($icAND[$key]); 
        } 

        foreach ($gd_image_array as $key => $gd_image) { //开源OSPhP.COM.CN 
            $icondata .= $BitmapInfoHeader[$key]; 
            $icondata .= $icXOR[$key]; 
            $icondata .= $icAND[$key]; 
        } 

        return $icondata; 
    } 

} 

?>