<?php
//////////////////////////////////////////////////////////////
//   phpThumb() by James Heinrich <info@silisoftware.com>   //
//        available at http://phpthumb.sourceforge.net      //
//         and/or https://github.com/JamesHeinrich/phpThumb //
//////////////////////////////////////////////////////////////
///                                                         //
// 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) {
                        
$icXOR[$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($scanlinemaskbits$i8), 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] .= "\x28\x00\x00\x00";                              // 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] * 24); // LONG   biHeight;
            
$BitmapInfoHeader[$key] .= "\x01\x00";                                      // WORD   biPlanes;
               
$BitmapInfoHeader[$key] .= chr($bpp[$key])."\x00";                          // wBitCount;
            
$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // DWORD  biCompression;
            
$BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($biSizeImage4);            // DWORD  biSizeImage;
            
$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // LONG   biXPelsPerMeter;
            
$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // LONG   biYPelsPerMeter;
            
$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // DWORD  biClrUsed;
            
$BitmapInfoHeader[$key] .= "\x00\x00\x00\x00";                              // DWORD  biClrImportant;
        
}


        
$icondata  "\x00\x00";                                      // idReserved;   // Reserved (must be 0)
        
$icondata .= "\x01\x00";                                      // idType;       // Resource Type (1 for icons)
        
$icondata .= phpthumb_functions::LittleEndian2String(count($gd_image_array), 2);  // idCount;      // How many images?

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

            
$icondata .= chr($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 .= "\x01\x00";                                  // wPlanes;         // Color Planes
            
$icondata .= chr($bpp[$key])."\x00";                      // wBitCount;       // Bits per pixel

            
$dwBytesInRes 40 strlen($icXOR[$key]) + strlen($icAND[$key]);
            
$icondata .= phpthumb_functions::LittleEndian2String($dwBytesInRes4);       // dwBytesInRes;    // How many bytes in this resource?

            
$icondata .= phpthumb_functions::LittleEndian2String($dwImageOffset4);      // 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) {
            
$icondata .= $BitmapInfoHeader[$key];
            
$icondata .= $icXOR[$key];
            
$icondata .= $icAND[$key];
        }

        return 
$icondata;
    }

}

?>