Image.php

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<?php
// FleaPHP Framework
//
// Copyright (c) 2005 - 2008 QeeYuan China Inc. (http://www.qeeyuan.com)
//
// 许可协议，请查看源代码中附带的 LICENSE.txt 文件，
// 或者访问 http://www.fleaphp.org/ 获得详细信息。

class FLEA_Helper_Image
{
    var $_handle = null;

    function FLEA_Helper_Image($handle)
    {
        $this->_handle = $handle;
    }

    function & createFromFile($filename, $fileext = null)
    {
        if (is_null($fileext)) {
            $fileext = pathinfo($filename, PATHINFO_EXTENSION);
        }
        $fileext = strtolower($fileext);
        $ext2functions = array(
            'jpg' => 'imagecreatefromjpeg',
            'jpeg' => 'imagecreatefromjpeg',
            'png' => 'imagecreatefrompng',
            'gif' => 'imagecreatefromgif',
        );
        if (!isset($ext2functions[$fileext])) {
            FLEA::loadClass('FLEA_Exception_NotImplemented');
            __THROW(new FLEA_Exception_NotImplemented('imagecreatefrom' . $fileext));
            return false;
        }

        $handle = $ext2functions[$fileext]($filename);
        $img =& new FLEA_Helper_Image($handle);
        return $img;
    }

    function resize($width, $height)
    {
        if (is_null($this->_handle)) { return; }
        $dest = imagecreatetruecolor($width, $height);
        imagecopyresized($dest, $this->_handle, 0, 0, 0, 0,
                $width, $height, imagesx($this->_handle), imagesy($this->_handle));
        imagedestroy($this->_handle);
        $this->_handle = $dest;
    }

    function resampled($width, $height)
    {
        if (is_null($this->_handle)) { return; }
        $dest = imagecreatetruecolor($width, $height);
        imagecopyresampled($dest, $this->_handle, 0, 0, 0, 0,
                $width, $height, imagesx($this->_handle), imagesy($this->_handle));
        imagedestroy($this->_handle);
        $this->_handle = $dest;
    }

    function resizeCanvas($width, $height, $pos = 'center', $bgcolor = '0xffffff')
    {
        if (is_null($this->_handle)) { return; }
        $dest = imagecreatetruecolor($width, $height);
        $sx = imagesx($this->_handle);
        $sy = imagesy($this->_handle);

        // 根据 pos 属性来决定如何定位原始图片
        switch (strtolower($pos)) {
        case 'left':
            $ox = 0;
            $oy = ($height - $sy) / 2;
            break;
        case 'right':
            $ox = $width - $sx;
            $oy = ($height - $sy) / 2;
            break;
        case 'top':
            $ox = ($width - $sx) / 2;
            $oy = 0;
            break;
        case 'bottom':
            $ox = ($width - $sx) / 2;
            $oy = $height - $sy;
            break;
        case 'top-left':
            $ox = $oy = 0;
            break;
        case 'top-right':
            $ox = $width - $sx;
            $oy = 0;
            break;
        case 'bottom-left':
            $ox = 0;
            $oy = $height - $sy;
            break;
        case 'bottom-right':
            $ox = $width - $sx;
            $oy = $height - $sy;
            break;
        default:
            $ox = ($width - $sx) / 2;
            $oy = ($height - $sy) / 2;
        }

        list($r, $g, $b) = $this->extractColor($bgcolor, '0xffffff');
        $bgcolor = imagecolorallocate($dest, $r, $g, $b);
        imagefilledrectangle($dest, 0, 0, $width, $height, $bgcolor);
        imagecolordeallocate($dest, $bgcolor);

        imagecopy($dest, $this->_handle, $ox, $oy, 0, 0, $sx, $sy);
        imagedestroy($this->_handle);
        $this->_handle = $dest;
    }

    function crop($width, $height, $highQuality = true, $nocut = null)
    {
        if (is_null($this->_handle)) { return; }
        $dest = imagecreatetruecolor($width, $height);
        $sx = imagesx($this->_handle);
        $sy = imagesy($this->_handle);
        $ratio = doubleval($width) / doubleval($sx);

        if (!is_array($nocut)) {
            if ($nocut) {
                $nocut = array('enabled' => true, 'pos' => 'center', 'bgcolor' => '0xffffff');
            } else {
                $nocut = array('enabled' => false);
            }
        } else {
            $nocut['enabled'] = isset($nocut['enabled']) ? $nocut['enabled']: true;
            $nocut['pos'] = isset($nocut['pos']) ? $nocut['pos']: 'center';
            $nocut['bgcolor'] = isset($nocut['bgcolor']) ? $nocut['bgcolor']: '0xffffff';
        }

        if ($nocut['enabled']) {
            // 求缩放后的最大宽度和高度
            if ($sy * $ratio > $height) {
                $ratio = doubleval($height) / doubleval($sy);
            }
            $dx = $sx * $ratio;
            $dy = $sy * $ratio;

            // 根据 pos 属性来决定如何定位原始图片
            switch (strtolower($nocut['pos'])) {
            case 'left':
                $ox = 0;
                $oy = ($height - $sy * $ratio) / 2;
                break;
            case 'right':
                $ox = $width - $sx * $ratio;
                $oy = ($height - $sy * $ratio) / 2;
                break;
            case 'top':
                $ox = ($width - $sx * $ratio) / 2;
                $oy = 0;
                break;
            case 'bottom':
                $ox = ($width - $sx * $ratio) / 2;
                $oy = $height - $sy * $ratio;
                break;
            case 'top-left':
                $ox = $oy = 0;
                break;
            case 'top-right':
                $ox = $width - $sx * $ratio;
                $oy = 0;
                break;
            case 'bottom-left':
                $ox = 0;
                $oy = $height - $sy * $ratio;
                break;
            case 'bottom-right':
                $ox = $width - $sx * $ratio;
                $oy = $height - $sy * $ratio;
                break;
            default:
                $ox = ($width - $sx * $ratio) / 2;
                $oy = ($height - $sy * $ratio) / 2;
            }

            list($r, $g, $b) = $this->extractColor($nocut['bgcolor'], '0xffffff');
            $bgcolor = imagecolorallocate($dest, $r, $g, $b);
            imagefilledrectangle($dest, 0, 0, $width, $height, $bgcolor);
            imagecolordeallocate($dest, $bgcolor);

            $args = array($dest, $this->_handle, $ox, $oy, 0, 0, $dx, $dy, $sx, $sy);
        } else {
            // 允许图像溢出
            if ($sy * $ratio < $height) {
                // 当按照比例缩放后的图像高度小于要求的高度时，只有放弃原始图像右边的部分内容
                $ratio = doubleval($sy) / doubleval($height);
                $sx = $width * $ratio;
            } elseif ($sy * $ratio > $height) {
                // 当按照比例缩放后的图像高度大于要求的高度时，只有放弃原始图像底部的部分内容
                $ratio = doubleval($sx) / doubleval($width);
                $sy = $height * $ratio;
            }

            $args = array($dest, $this->_handle, 0, 0, 0, 0, $width, $height, $sx, $sy);
        }

        if ($highQuality) {
            call_user_func_array('imagecopyresampled', $args);
        } else {
            call_user_func_array('imagecopyresized', $args);
        }

        imagedestroy($this->_handle);
        $this->_handle = $dest;
    }

    function saveAsJpeg($filename, $quality = 80)
    {
        imagejpeg($this->_handle, $filename, $quality);
    }

    function saveAsPng($filename)
    {
        imagepng($this->_handle, $filename);
    }

    function saveAsGif($filename)
    {
        imagegif($this->_handle, $filename);
    }

    function destory()
    {
        imagedestroy($this->_handle);
        $this->_handle = null;
    }

    function extractColor($color, $defualt = 'ffffff')
    {
        $color = strtolower($color);
        if (substr($color, 0, 2) == '0x') {
            $color = substr($color, 2);
        } elseif (substr($color, 0, 1) == '#') {
            $color = substr($color, 1);
        }
        $l = strlen($color);
        if ($l == 3) {
            $r = hexdec(substr($color, 0, 1));
            $g = hexdec(substr($color, 1, 1));
            $b = hexdec(substr($color, 2, 1));
            return array($r, $g, $b);
        } elseif ($l != 6) {
            $color = $defualt;
        }

        $r = hexdec(substr($color, 0, 2));
        $g = hexdec(substr($color, 2, 2));
        $b = hexdec(substr($color, 4, 2));
        return array($r, $g, $b);
    }
}

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