gd.php

现在的这个版本除了对代码进了相当多的优化以外

        imagepalettecopy($img2,$img);

        $mask   = imagecolorresolve($img2,$color_mask[0],$color_mask[1],$color_mask[2]);

        // use simple lines copy for axes angles
        switch((int)($angle)){
            case 0:
                imagefill ($img2, 0, 0,$mask);
                for ($y=0; $y < $max_y; $y++) {
                    for ($x = $min_x; $x < $max_x; $x++){
                        $c  = @imagecolorat ( $img, $x, $y);
                        imagesetpixel($img2,$x+$x_offset,$y+$y_offset,$c);
                    }
                }
                break;
            case 90:
                imagefill ($img2, 0, 0,$mask);
                for ($x = $min_x; $x < $max_x; $x++){
                    for ($y=$min_y; $y < $max_y; $y++) {
                        $c  = imagecolorat ( $img, $x, $y);
                        imagesetpixel($img2,$max_y-$y-1,$x,$c);
                    }
                }
                break;
            case 180:
                imagefill ($img2, 0, 0,$mask);
                for ($y=0; $y < $max_y; $y++) {
                    for ($x = $min_x; $x < $max_x; $x++){
                        $c  = @imagecolorat ( $img, $x, $y);
                        imagesetpixel($img2, $max_x2-$x-1, $max_y2-$y-1, $c);
                    }
                }
                break;
            case 270:
                imagefill ($img2, 0, 0,$mask);
                for ($y=0; $y < $max_y; $y++) {
                    for ($x = $max_x; $x >= $min_x; $x--){
                        $c  = @imagecolorat ( $img, $x, $y);
                        imagesetpixel($img2,$y,$max_x-$x-1,$c);
                    }
                }
                break;
            // simple reverse rotation algo
            default:
                $i=0;
                for ($y = $min_y2; $y < $max_y2; $y++){

                    // Algebra :)
                    $x2 = round((($min_x2-$x1) * $cosT) + (($y-$y1) * $sinT + $x1),0);
                    $y2 = round((($y-$y1) * $cosT - ($min_x2-$x1) * $sinT + $y1),0);

                    for ($x = $min_x2; $x < $max_x2; $x++){

                        // Check if we are out of original bounces, if we are
                        // use the default color mask
                        if ( $x2>=0 && $x2<$max_x && $y2>=0 && $y2<$max_y ){
                            $c  = imagecolorat ( $img, $x2, $y2);
                        } else {
                            $c  = $mask;
                        }
                        imagesetpixel($img2,$x+$x_offset,$y+$y_offset,$c);

                        // round verboten!
                        $x2  += $cosT;
                        $y2  -= $sinT;
                    }
                }
                break;
        }
        $this->old_image    = $this->imageHandle;
        $this->imageHandle  =  $img2;
        return true;
    }


   /**
    * Resize Action
    *
    * For GD 2.01+ the new copyresampled function is used
    * It uses a bicubic interpolation algorithm to get far
    * better result.
    *
    * @param $new_x int  new width
    * @param $new_y int  new height
    *
    * @return true on success or pear error
    * @see PEAR::isError()
    */
    function _resize($new_x, $new_y) {
        if ($this->resized === true) {
            return false; /*PEAR::raiseError('You have already resized the image without saving it.  Your previous resizing will be overwritten', null, PEAR_ERROR_TRIGGER, E_USER_NOTICE);*/
        }
        if(function_exists('ImageCreateTrueColor')){
            $new_img =ImageCreateTrueColor($new_x,$new_y);
        } else {
            $new_img =ImageCreate($new_x,$new_y);
        }
        if(function_exists('ImageCopyResampled')){
            ImageCopyResampled($new_img, $this->imageHandle, 0, 0, 0, 0, $new_x, $new_y, $this->img_x, $this->img_y);
        } else {
            ImageCopyResized($new_img, $this->imageHandle, 0, 0, 0, 0, $new_x, $new_y, $this->img_x, $this->img_y);
        }
        $this->old_image = $this->imageHandle;
        $this->imageHandle = $new_img;
        $this->resized = true;

        $this->new_x = $new_x;
        $this->new_y = $new_y;
        return true;
    }

    /**
     * Crop the image
     *
     * @param int $crop_x left column of the image
     * @param int $crop_y top row of the image
     * @param int $crop_width new cropped image width
     * @param int $crop_height new cropped image height
     */
    function crop($new_x, $new_y, $new_width, $new_height) 
    {
        if(function_exists('ImageCreateTrueColor')){
            $new_img =ImageCreateTrueColor($new_width,$new_height);
        } else {
            $new_img =ImageCreate($new_width,$new_height);
        }
        if(function_exists('ImageCopyResampled')){
            ImageCopyResampled($new_img, $this->imageHandle, 0, 0, $new_x, $new_y,$new_width,$new_height,$new_width,$new_height);
        } else {
            ImageCopyResized($new_img, $this->imageHandle, 0, 0, $new_x, $new_y, $new_width,$new_height,$new_width,$new_height);
        }
        $this->old_image = $this->imageHandle;
        $this->imageHandle = $new_img;
        $this->resized = true;

        $this->new_x = $new_x;
        $this->new_y = $new_y;
        return true;
    }
   
    /**
     * Flip the image horizontally or vertically
     *
     * @param boolean $horizontal true if horizontal flip, vertical otherwise
     */
    function flip($horizontal)
    {
        if(!$horizontal) {
            $this->rotate(180);
        }

        $width = imagesx($this->imageHandle); 
        $height = imagesy($this->imageHandle); 

        for ($j = 0; $j < $height; $j++) { 
                $left = 0; 
                $right = $width-1; 


                while ($left < $right) { 
                    //echo " j:".$j." l:".$left." r:".$right."\n<br>";
                    $t = imagecolorat($this->imageHandle, $left, $j); 
                    imagesetpixel($this->imageHandle, $left, $j, imagecolorat($this->imageHandle, $right, $j)); 
                    imagesetpixel($this->imageHandle, $right, $j, $t); 
                    $left++; $right--; 
                } 
            
        }

        return true;
    }


    /**
     * Adjust the image gamma
     *
     * @param float $outputgamma
     *
     * @return none
     */
    function gamma($outputgamma=1.0) {
        ImageGammaCorrect($this->imageHandle, 1.0, $outputgamma);
    }

    /**
     * Save the image file
     *
     * @param $filename string  the name of the file to write to
     * @param $quality  int     output DPI, default is 85
     * @param $types    string  define the output format, default
     *                          is the current used format
     *
     * @return none
     */
    function save($filename, $type = '', $quality = 85)
    {
		$type           = $type==''? $this->type : $type;
		$functionName   = 'image' . $type;

		if(function_exists($functionName))
		{
			$this->old_image = $this->imageHandle;
			if($type=='jpeg')
				$functionName($this->imageHandle, $filename, $quality);
			else
				$functionName($this->imageHandle, $filename);
			$this->imageHandle = $this->old_image;
			$this->resized = false;
		}
    } // End save


    /**
     * Display image without saving and lose changes
     *
     * @param string type (JPG,PNG...);
     * @param int quality 75
     *
     * @return none
     */
    function display($type = '', $quality = 75)
    {
        if ($type != '') {
            $this->type = $type;
        }
        $functionName = 'Image' . $this->type;
		if(function_exists($functionName))
		{
			header('Content-type: image/' . strtolower($this->type));
			$functionName($this->imageHandle, '', $quality);
			$this->imageHandle = $this->old_image;
			$this->resized = false;
			ImageDestroy($this->old_image);
			$this->free();
		}
    }

    /**
     * Destroy image handle
     *
     * @return none
     */
    function free()
    {
        if ($this->imageHandle){
            ImageDestroy($this->imageHandle);
        }
    }

} // End class ImageGD
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