Ed_imageresizer::_resize PHP 메소드

    private function _resize()
    {
        // Setting up the ratios needed for resizing. We will compare these below to determine how to
        // resize the image (based on height or based on width)
        $this->xRatio = $this->maxWidth / $this->width;
        $this->yRatio = $this->maxHeight / $this->height;
        if ($this->xRatio * $this->height < $this->maxHeight || $this->forceWidth === true) {
            // Resize the image based on width
            $this->tnHeight = ceil($this->xRatio * $this->height);
            $this->tnWidth = $this->maxWidth;
        } else {
            $this->tnWidth = ceil($this->yRatio * $this->width);
            $this->tnHeight = $this->maxHeight;
        }
        // We don't want to run out of memory
        ini_set('memory_limit', $this->memory_limit);
        // Set up a blank canvas for our resized image (destination)
        $this->dst = imagecreatetruecolor($this->tnWidth, $this->tnHeight);
        // Set up the appropriate image handling functions based on the original image's mime type
        switch ($this->mime) {
            case 'image/gif':
                // We will be converting GIFs to PNGs to avoid transparency issues when resizing GIFs
                // This is maybe not the ideal solution, but IE6 can suck it
                $this->creationFunction = 'ImageCreateFromGif';
                $this->outputFunction = 'ImagePng';
                $this->mime = 'image/png';
                // We need to convert GIFs to PNGs
                $this->doSharpen = FALSE;
                $this->quality = round(10 - $this->quality / 10);
                // We are converting the GIF to a PNG and PNG needs a compression level of 0 (no compression) through 9
                break;
            case 'image/x-png':
            case 'image/png':
                $this->creationFunction = 'ImageCreateFromPng';
                $this->outputFunction = 'ImagePng';
                $this->doSharpen = FALSE;
                $this->quality = round(10 - $this->quality / 10);
                // PNG needs a compression level of 0 (no compression) through 9
                break;
            default:
                $this->creationFunction = 'ImageCreateFromJpeg';
                $this->outputFunction = 'ImageJpeg';
                $this->doSharpen = FALSE;
                break;
        }
        // Read in the original image
        $function = $this->creationFunction;
        $this->src = $function($this->server_path . $this->image);
        if (in_array($this->mime, array('image/gif', 'image/png'))) {
            if ($this->color == '') {
                // If this is a GIF or a PNG, we need to set up transparency
                imagealphablending($this->dst, false);
                imagesavealpha($this->dst, true);
            } else {
                // Fill the background with the specified color for matting purposes
                if ($this->color[0] == '#') {
                    $this->color = substr($this->color, 1);
                }
                $this->background = FALSE;
                if (strlen($this->color) == 6) {
                    $this->background = imagecolorallocate($this->dst, hexdec($this->color[0] . $this->color[1]), hexdec($this->color[2] . $this->color[3]), hexdec($this->color[4] . $this->color[5]));
                } else {
                    if (strlen($color) == 3) {
                        $this->background = imagecolorallocate($this->dst, hexdec($this->color[0] . $this->color[0]), hexdec($this->color[1] . $this->color[1]), hexdec($this->color[2] . $this->color[2]));
                    }
                }
                if ($this->background) {
                    imagefill($this->dst, 0, 0, $this->background);
                }
            }
        }
        // Resample the original image into the resized canvas we set up earlier
        ImageCopyResampled($this->dst, $this->src, 0, 0, $this->offsetX, $this->offsetY, $this->tnWidth, $this->tnHeight, $this->width, $this->height);
        // try to grayscale it
        if ($this->grayscale == TRUE) {
            $this->dst = $this->_makeGrayscale($this->dst);
        }
        $this->etag = $this->_saveFile();
    }