_has_requirements = true; if ( false != $file ) $this->add_image( $file, $sizes ); } /** * Add an image to the generator. * * This function adds a source image to the generator. It serves two main purposes: add a source image if one was * not supplied to the constructor and to add additional source images so that different images can be supplied for * different sized images in the resulting ICO file. For instance, a small source image can be used for the small * resolutions while a larger source image can be used for large resolutions. * * @param string $file Path to the source image file. * @param array $sizes Optional. An array of sizes (each size is an array with a width and height) that the source image should be rendered at in the generated ICO file. If sizes are not supplied, the size of the source image will be used. * @return boolean true on success and false on failure. */ function add_image( $file, $sizes = array() ) { if ( ! $this->_has_requirements ) return false; if ( false === ( $im = $this->_load_image_file( $file ) ) ) return false; if ( empty( $sizes ) ) $sizes = array( imagesx( $im ), imagesy( $im ) ); // If just a single size was passed, put it in array. if ( ! is_array( $sizes[0] ) ) $sizes = array( $sizes ); foreach ( (array) $sizes as $size ) { list( $width, $height ) = $size; $new_im = imagecreatetruecolor( $width, $height ); imagecolortransparent( $new_im, imagecolorallocatealpha( $new_im, 0, 0, 0, 127 ) ); imagealphablending( $new_im, false ); imagesavealpha( $new_im, true ); $source_width = imagesx( $im ); $source_height = imagesy( $im ); if ( false === imagecopyresampled( $new_im, $im, 0, 0, 0, 0, $width, $height, $source_width, $source_height ) ) continue; $this->_add_image_data( $new_im ); } return true; } /** * Write the ICO file data to a file path. * * @param string $file Path to save the ICO file data into. * @return boolean true on success and false on failure. */ function save_ico( $file ) { if ( ! $this->_has_requirements ) return false; if ( false === ( $data = $this->_get_ico_data() ) ) return false; if ( false === ( $fh = fopen( $file, 'w' ) ) ) return false; if ( false === ( fwrite( $fh, $data ) ) ) { fclose( $fh ); return false; } fclose( $fh ); return true; } /** * Generate the final ICO data by creating a file header and adding the image data. * * @access private */ function _get_ico_data() { if ( ! is_array( $this->_images ) || empty( $this->_images ) ) return false; $data = pack( 'vvv', 0, 1, count( $this->_images ) ); $pixel_data = ''; $icon_dir_entry_size = 16; $offset = 6 + ( $icon_dir_entry_size * count( $this->_images ) ); foreach ( $this->_images as $image ) { $data .= pack( 'CCCCvvVV', $image['width'], $image['height'], $image['color_palette_colors'], 0, 1, $image['bits_per_pixel'], $image['size'], $offset ); $pixel_data .= $image['data']; $offset += $image['size']; } $data .= $pixel_data; unset( $pixel_data ); return $data; } /** * Take a GD image resource and change it into a raw BMP format. * * @access private */ function _add_image_data( $im ) { $width = imagesx( $im ); $height = imagesy( $im ); $pixel_data = array(); $opacity_data = array(); $current_opacity_val = 0; for ( $y = $height - 1; $y >= 0; $y-- ) { for ( $x = 0; $x < $width; $x++ ) { $color = imagecolorat( $im, $x, $y ); $alpha = ( $color & 0x7F000000 ) >> 24; $alpha = ( 1 - ( $alpha / 127 ) ) * 255; $color &= 0xFFFFFF; $color |= 0xFF000000 & ( $alpha << 24 ); $pixel_data[] = $color; $opacity = ( $alpha <= 127 ) ? 1 : 0; $current_opacity_val = ( $current_opacity_val << 1 ) | $opacity; if ( ( ( $x + 1 ) % 32 ) == 0 ) { $opacity_data[] = $current_opacity_val; $current_opacity_val = 0; } } if ( ( $x % 32 ) > 0 ) { while ( ( $x++ % 32 ) > 0 ) $current_opacity_val = $current_opacity_val << 1; $opacity_data[] = $current_opacity_val; $current_opacity_val = 0; } } $image_header_size = 40; $color_mask_size = $width * $height * 4; $opacity_mask_size = ( ceil( $width / 32 ) * 4 ) * $height; $data = pack( 'VVVvvVVVVVV', 40, $width, ( $height * 2 ), 1, 32, 0, 0, 0, 0, 0, 0 ); foreach ( $pixel_data as $color ) $data .= pack( 'V', $color ); foreach ( $opacity_data as $opacity ) $data .= pack( 'N', $opacity ); $image = array( 'width' => $width, 'height' => $height, 'color_palette_colors' => 0, 'bits_per_pixel' => 32, 'size' => $image_header_size + $color_mask_size + $opacity_mask_size, 'data' => $data, ); $this->_images[] = $image; } /** * Read in the source image file and convert it into a GD image resource. * * @access private */ function _load_image_file( $file ) { // Run a cheap check to verify that it is an image file. if ( false === ( $size = getimagesize( $file ) ) ) return false; if ( false === ( $file_data = file_get_contents( $file ) ) ) return false; if ( false === ( $im = imagecreatefromstring( $file_data ) ) ) return false; unset( $file_data ); return $im; } } ?>