我想把一个动态gif拆分成一帧一帧的 然后对单帧进行修改后再合并起来 在网上找了一段代码 但是在拆分成单帧的时候就出了问题 但是不知道错在哪里了 请各位大虾帮忙看看 代码如下
<code><?php class TGif { var $signature; //签名 var $version; //版本 var $image = array(); var $frame = 0; var $buffer = ''; //图片数据缓存区 /** * 内部方法 next * 从图片数据缓冲区读取指定长度的字符串 * 参数 $len 数值,读取的长度,确省为1 * 返回 长度为1时返回码值 * 其他返回字符串 **/ function next($len=1) { $ch = substr($this->buffer, 0, $len); $this->buffer = substr($this->buffer, $len); if($len == 1) return ord($ch); return $ch; } /** * 内部方法 get_number * 从图片数据缓冲区读取一个整数 * 参数 无 * 返回 整数 **/ function get_number() { $t = unpack("Sn", $this->next(2)); return $t['n']; } /** * 构造函数 * 参数 $imagename 字符串,图片文件名或图片数据 * 返回 无 **/ function TGif($imagename="images/xzn.gif") { $this->image = array(); $this->frame = 0; if(is_file($imagename)) { $this->imagename = $imagename; $this->buffer = @file_get_contents($imagename) or trigger_error("$imagename 打不开", E_USER_ERROR); }else { substr($imagename, 0, 3) == 'GIF' or trigger_error("$imagename 不存在或不是GIF格式图片", E_USER_ERROR); $this->buffer = $imagename; $this->imagename = '未命名'; } $this->get_header(); while(strlen($this->buffer)) { switch($this->next()) { case 0x21: //图象扩展描述符 $this->get_extension_introducer(); break; case 0x2c: //图象描述符 $this->get_image_descriptor(); break; case 0x3b: //GIF数据流结束 return; } } } /** * 内部方法 get_color_table * 读取调色板数据 **/ function get_color_table($num) { return $this->next(3*pow(2,$num+1)); } /** * 内部方法 get_header * 读取头信息 **/ function get_header() { $this->signature = $this->next(3); //类型标识gif if($this->signature != 'GIF') trigger_error("$this->imagename 不是GIF格式图片", E_USER_ERROR); $this->version = $this->next(3); //版本标识 $this->logical_screen_width = $this->get_number(); //逻辑屏幕宽 $this->logical_screen_height = $this->get_number(); //逻辑屏幕高 $this->flag = $flag = $this->next(); $this->global_color_table_flag = ($flag & 0x80) > 0; //是否有全局调色板 $this->color_resolution = (($flag >> 4) & 0x07) + 1; //彩色分辨率 $this->sort_flag = ($flag & 0x08) > 0; //调色板是否排序 $this->size_of_global_color_table = $flag & 0x07; //全局色板大小,2的乘方的指数 $this->background_color_index = $this->next(); //背景色索引 $this->pixel_aspect_ratio = $this->next(); //像素纵横比 if($this->global_color_table_flag) $this->global_color_table = $this->get_color_table($this->size_of_global_color_table); } /** * 内部方法 get_image_descriptor * 读取图片信息 **/ function get_image_descriptor() { $image['left_position'] = $this->get_number(); $image['top_position'] = $this->get_number(); $image['width'] = $this->get_number(); $image['height'] = $this->get_number(); $image['flag'] = $flag = $this->next(); $image['local_color_table_flag'] = ($flag & 0x80) > 0; //局部色表 $image['interlace_flag'] = ($flag & 0x40) > 0; //交错 $image['local_sort_flag'] = ($flag & 0x20) > 0; //色表是否排序 $image['size_of_local_color_table'] = $flag & 0x07; //局部色表大小 if($image['local_color_table_flag']) $image['local_color_table'] = $this->get_color_table($image['size_of_local_color_table']); $image['data'] = $this->get_table_based_image_data(); $this->image[$this->frame] = array_merge($this->image[$this->frame], $image); $this->frame++; } /** * 内部方法 get_table_based_image_data * 读取图象数据 **/ function get_table_based_image_data() { $table_based_image_data_size = 0; $table_based_image_data = chr($this->next()); while($n = $this->next()) { $table_based_image_data_size += $n; $table_based_image_data .= chr($n); $table_based_image_data .= $this->next($n); } $table_based_image_data .= chr(0); return $table_based_image_data; } /** * 内部方法 get_extension_introducer * 读取图象扩展 **/ function get_extension_introducer() { switch($this->next()) { case 0xf9: $size = $this->next(); //固定为4 $flag = $this->next(); $this->image[$this->frame]['disposal_method'] = ($flag >> 2) & 0x07; $this->image[$this->frame]['transparent_flag'] = $flag & 0x01; $this->image[$this->frame]['delay_time'] = $this->get_number(); $this->image[$this->frame]['transparecy_index'] = $this->next(); $this->next(); break; case 0xfe: while($this->next() != 0); break; case 0x01: $this->next(); $delay_time = $this->get_number(); $delay_time = $this->get_number(); $delay_time = $this->get_number(); $delay_time = $this->get_number(); $this->next(); $this->next(); $this->next(); $this->next(); while($this->next() != 0); break; case 0xff: $this->application_extension = $this->next($this->next()); while($this->next() != 0); break; } } /** * 公共方法 info * 产生图片信息报告 **/ function info() { if(isset($_GET['frame'])) { echo $this->withdraw($_GET['frame']); exit; } $dict = array( 'logical_screen_width' => '图片宽度', 'logical_screen_height' => '图片高度', 'global_color_table_flag' => '全局色表', 'color_resolution' => '彩色分辨率', 'sort_flag' => '排序标志', 'size_of_global_color_table' => '全局色表大小', 'background_color_index' => '背景色索引', 'pixel_aspect_ratio' => '像素纵横比', 'frame' => '帧数', 'application_extension' => '应用程序扩展', ); $image_dict = array( 'left_position' => '图象左边距', 'top_position' => '图象上边距', 'width' => '图象宽', 'height' => '图象高', 'local_color_table_flag' => '局部色表', 'interlace_flag' => '交错', 'local_sort_flag' => '排序标志', 'size_of_local_color_table' => '局部色表大小', 'delay_time' => '停顿时间', 'disposal_method' => '处置方式', 'transparecy_index' => '透明色索引', ); echo '<table border>'; printf("<tr><th colspan="2">图片文件名 %s</th></tr>", $this->imagename); echo '<tr> <td><table>'; foreach($dict as $key => $value) printf("<tr> <td>%s</td> <td>%s</td> </tr>",$value,$this->$key); printf("</table></td> <td><img src="%s" alt="用php将动态gif拆分成单帧" ></td> </tr>", $this->imagename); for($i=0; $iframe; $i++) { printf("<tr><th colspan="2">帧号 %s</th></tr>",$i); echo '<tr> <td><table>'; foreach($image_dict as $key => $value) printf("<tr> <td>%s</td> <td>%s</td> </tr>",$value,$this->image[$i][$key]); printf("</table></td> <td><img src="?frame=%d" alt="用php将动态gif拆分成单帧" ></td> </tr>", $i); } echo "</table>"; } /** * 内部方法 control_extension,由withdraw方法调用 * 输出图象扩展控制段 * 参数 * $frame 数值,图片帧号 * $delay_time 数值,图象停顿时间,单位为百分秒(10ms) * $disposal_mothod 数值,处置方式 * 返回 无 **/ function control_extension($frame=0, $delay_time=10, $disposal_mothod=0) { $transparent = $this->image[$frame]['transparecy_index']; $flag = ($disposal_mothod image[$frame]['transparent_flag']; echo pack("CCCCSCC", 0x21, 0xf9, 4, $flag, $delay_time, $transparent, 0); } /** * 内部方法 image_frame,由withdraw方法调用 * 输出一帧图象 * 参数 * $frame 数值,图片帧号 * $left 数值,图象左边距 * $top 数值,图象上边距 * $colortab 字符串,对比用的全局调色板数据 * 返回 无 **/ function image_frame($frame=0, $left=null, $top=null, $colortab=null) { if($left == null) $left = $this->image[$frame]['left_position']; if($top == null) $top = $this->image[$frame]['top_position']; $flag = $this->image[$frame]['flag']; $color_table = ''; if($this->image[$frame]['local_color_table_flag']) { //如图象有局部调色板则取局部调色板 $color_table = $this->image[$frame]['local_color_table']; }elseif($colortable != null && $colortable != $this->global_color_table) { //如图象没有局部调色板且全局调色板与对比调色板不同,就把全局调色板设置为局部调色板 $flag &= 0x40; //保留交错标志 $flag |= $this->sort_flag ? 0x20 : 0x00; //设置排序标志 $flag |= 0x80; //设置局部色表标志 $flag |= $this->size_of_global_color_table; $color_table = $this->global_color_table; } $width = $this->image[$frame]['width']; $height = $this->image[$frame]['height']; echo pack("CSSSSC", 0x2c, $left, $top, $width, $height, $flag); echo $color_table; echo $this->image[$frame]['data']; } /** * 内部方法 image_header,由withdraw方法调用 * 输出图片头 * 参数 * $width 数值,图片宽 * $height 数值,图片高 * 返回 无 **/ function image_header($width=0, $height=0) { ob_start(); printf("GIF89a%s%s%c%c%c" , pack("S", $this->logical_screen_width) , pack("S", $this->logical_screen_height) , $this->flag , $this->background_color_index , $this->pixel_aspect_ratio ); if($this->global_color_table_flag) echo $this->global_color_table; } /** * 内部方法 image_end,由withdraw方法调用 * 输出图片尾,并返回图片数据 * 返回 字符串,图片数据 **/ function image_end() { echo chr(0x3b); $buf = ob_get_clean(); return $buf; } /** * 公共方法 withdraw * 生成单帧的图片[文件] * 参数 * $frame 数值,提取的帧号 * $filename 字符串,目标文件名,缺省为空(不生成文件) * 返回 字符串,图片数据 **/ function withdraw($frame=0, $filename='') { if($frame > $this->frame-1) $frame = 0; $this->image_header(); $this->control_extension($frame); $this->image_frame($frame); $buf = $this->image_end(); if(!empty($filename)) file_put_contents($filename, $buf); return $buf; } } $p = new TGif('old.gif'); //$p->info(); echo $p->withdraw(0, 'hello.gif'); //print_r($p->image); ?> </code>
我想把一个动态gif拆分成一帧一帧的 然后对单帧进行修改后再合并起来 在网上找了一段代码 但是在拆分成单帧的时候就出了问题 但是不知道错在哪里了 请各位大虾帮忙看看 代码如下
<code><?php class TGif { var $signature; //签名 var $version; //版本 var $image = array(); var $frame = 0; var $buffer = ''; //图片数据缓存区 /** * 内部方法 next * 从图片数据缓冲区读取指定长度的字符串 * 参数 $len 数值,读取的长度,确省为1 * 返回 长度为1时返回码值 * 其他返回字符串 **/ function next($len=1) { $ch = substr($this->buffer, 0, $len); $this->buffer = substr($this->buffer, $len); if($len == 1) return ord($ch); return $ch; } /** * 内部方法 get_number * 从图片数据缓冲区读取一个整数 * 参数 无 * 返回 整数 **/ function get_number() { $t = unpack("Sn", $this->next(2)); return $t['n']; } /** * 构造函数 * 参数 $imagename 字符串,图片文件名或图片数据 * 返回 无 **/ function TGif($imagename="images/xzn.gif") { $this->image = array(); $this->frame = 0; if(is_file($imagename)) { $this->imagename = $imagename; $this->buffer = @file_get_contents($imagename) or trigger_error("$imagename 打不开", E_USER_ERROR); }else { substr($imagename, 0, 3) == 'GIF' or trigger_error("$imagename 不存在或不是GIF格式图片", E_USER_ERROR); $this->buffer = $imagename; $this->imagename = '未命名'; } $this->get_header(); while(strlen($this->buffer)) { switch($this->next()) { case 0x21: //图象扩展描述符 $this->get_extension_introducer(); break; case 0x2c: //图象描述符 $this->get_image_descriptor(); break; case 0x3b: //GIF数据流结束 return; } } } /** * 内部方法 get_color_table * 读取调色板数据 **/ function get_color_table($num) { return $this->next(3*pow(2,$num+1)); } /** * 内部方法 get_header * 读取头信息 **/ function get_header() { $this->signature = $this->next(3); //类型标识gif if($this->signature != 'GIF') trigger_error("$this->imagename 不是GIF格式图片", E_USER_ERROR); $this->version = $this->next(3); //版本标识 $this->logical_screen_width = $this->get_number(); //逻辑屏幕宽 $this->logical_screen_height = $this->get_number(); //逻辑屏幕高 $this->flag = $flag = $this->next(); $this->global_color_table_flag = ($flag & 0x80) > 0; //是否有全局调色板 $this->color_resolution = (($flag >> 4) & 0x07) + 1; //彩色分辨率 $this->sort_flag = ($flag & 0x08) > 0; //调色板是否排序 $this->size_of_global_color_table = $flag & 0x07; //全局色板大小,2的乘方的指数 $this->background_color_index = $this->next(); //背景色索引 $this->pixel_aspect_ratio = $this->next(); //像素纵横比 if($this->global_color_table_flag) $this->global_color_table = $this->get_color_table($this->size_of_global_color_table); } /** * 内部方法 get_image_descriptor * 读取图片信息 **/ function get_image_descriptor() { $image['left_position'] = $this->get_number(); $image['top_position'] = $this->get_number(); $image['width'] = $this->get_number(); $image['height'] = $this->get_number(); $image['flag'] = $flag = $this->next(); $image['local_color_table_flag'] = ($flag & 0x80) > 0; //局部色表 $image['interlace_flag'] = ($flag & 0x40) > 0; //交错 $image['local_sort_flag'] = ($flag & 0x20) > 0; //色表是否排序 $image['size_of_local_color_table'] = $flag & 0x07; //局部色表大小 if($image['local_color_table_flag']) $image['local_color_table'] = $this->get_color_table($image['size_of_local_color_table']); $image['data'] = $this->get_table_based_image_data(); $this->image[$this->frame] = array_merge($this->image[$this->frame], $image); $this->frame++; } /** * 内部方法 get_table_based_image_data * 读取图象数据 **/ function get_table_based_image_data() { $table_based_image_data_size = 0; $table_based_image_data = chr($this->next()); while($n = $this->next()) { $table_based_image_data_size += $n; $table_based_image_data .= chr($n); $table_based_image_data .= $this->next($n); } $table_based_image_data .= chr(0); return $table_based_image_data; } /** * 内部方法 get_extension_introducer * 读取图象扩展 **/ function get_extension_introducer() { switch($this->next()) { case 0xf9: $size = $this->next(); //固定为4 $flag = $this->next(); $this->image[$this->frame]['disposal_method'] = ($flag >> 2) & 0x07; $this->image[$this->frame]['transparent_flag'] = $flag & 0x01; $this->image[$this->frame]['delay_time'] = $this->get_number(); $this->image[$this->frame]['transparecy_index'] = $this->next(); $this->next(); break; case 0xfe: while($this->next() != 0); break; case 0x01: $this->next(); $delay_time = $this->get_number(); $delay_time = $this->get_number(); $delay_time = $this->get_number(); $delay_time = $this->get_number(); $this->next(); $this->next(); $this->next(); $this->next(); while($this->next() != 0); break; case 0xff: $this->application_extension = $this->next($this->next()); while($this->next() != 0); break; } } /** * 公共方法 info * 产生图片信息报告 **/ function info() { if(isset($_GET['frame'])) { echo $this->withdraw($_GET['frame']); exit; } $dict = array( 'logical_screen_width' => '图片宽度', 'logical_screen_height' => '图片高度', 'global_color_table_flag' => '全局色表', 'color_resolution' => '彩色分辨率', 'sort_flag' => '排序标志', 'size_of_global_color_table' => '全局色表大小', 'background_color_index' => '背景色索引', 'pixel_aspect_ratio' => '像素纵横比', 'frame' => '帧数', 'application_extension' => '应用程序扩展', ); $image_dict = array( 'left_position' => '图象左边距', 'top_position' => '图象上边距', 'width' => '图象宽', 'height' => '图象高', 'local_color_table_flag' => '局部色表', 'interlace_flag' => '交错', 'local_sort_flag' => '排序标志', 'size_of_local_color_table' => '局部色表大小', 'delay_time' => '停顿时间', 'disposal_method' => '处置方式', 'transparecy_index' => '透明色索引', ); echo '<table border>'; printf("<tr><th colspan="2">图片文件名 %s</th></tr>", $this->imagename); echo '<tr> <td><table>'; foreach($dict as $key => $value) printf("<tr> <td>%s</td> <td>%s</td> </tr>",$value,$this->$key); printf("</table></td> <td><img src="%s" alt="用php将动态gif拆分成单帧" ></td> </tr>", $this->imagename); for($i=0; $iframe; $i++) { printf("<tr><th colspan="2">帧号 %s</th></tr>",$i); echo '<tr> <td><table>'; foreach($image_dict as $key => $value) printf("<tr> <td>%s</td> <td>%s</td> </tr>",$value,$this->image[$i][$key]); printf("</table></td> <td><img src="?frame=%d" alt="用php将动态gif拆分成单帧" ></td> </tr>", $i); } echo "</table>"; } /** * 内部方法 control_extension,由withdraw方法调用 * 输出图象扩展控制段 * 参数 * $frame 数值,图片帧号 * $delay_time 数值,图象停顿时间,单位为百分秒(10ms) * $disposal_mothod 数值,处置方式 * 返回 无 **/ function control_extension($frame=0, $delay_time=10, $disposal_mothod=0) { $transparent = $this->image[$frame]['transparecy_index']; $flag = ($disposal_mothod image[$frame]['transparent_flag']; echo pack("CCCCSCC", 0x21, 0xf9, 4, $flag, $delay_time, $transparent, 0); } /** * 内部方法 image_frame,由withdraw方法调用 * 输出一帧图象 * 参数 * $frame 数值,图片帧号 * $left 数值,图象左边距 * $top 数值,图象上边距 * $colortab 字符串,对比用的全局调色板数据 * 返回 无 **/ function image_frame($frame=0, $left=null, $top=null, $colortab=null) { if($left == null) $left = $this->image[$frame]['left_position']; if($top == null) $top = $this->image[$frame]['top_position']; $flag = $this->image[$frame]['flag']; $color_table = ''; if($this->image[$frame]['local_color_table_flag']) { //如图象有局部调色板则取局部调色板 $color_table = $this->image[$frame]['local_color_table']; }elseif($colortable != null && $colortable != $this->global_color_table) { //如图象没有局部调色板且全局调色板与对比调色板不同,就把全局调色板设置为局部调色板 $flag &= 0x40; //保留交错标志 $flag |= $this->sort_flag ? 0x20 : 0x00; //设置排序标志 $flag |= 0x80; //设置局部色表标志 $flag |= $this->size_of_global_color_table; $color_table = $this->global_color_table; } $width = $this->image[$frame]['width']; $height = $this->image[$frame]['height']; echo pack("CSSSSC", 0x2c, $left, $top, $width, $height, $flag); echo $color_table; echo $this->image[$frame]['data']; } /** * 内部方法 image_header,由withdraw方法调用 * 输出图片头 * 参数 * $width 数值,图片宽 * $height 数值,图片高 * 返回 无 **/ function image_header($width=0, $height=0) { ob_start(); printf("GIF89a%s%s%c%c%c" , pack("S", $this->logical_screen_width) , pack("S", $this->logical_screen_height) , $this->flag , $this->background_color_index , $this->pixel_aspect_ratio ); if($this->global_color_table_flag) echo $this->global_color_table; } /** * 内部方法 image_end,由withdraw方法调用 * 输出图片尾,并返回图片数据 * 返回 字符串,图片数据 **/ function image_end() { echo chr(0x3b); $buf = ob_get_clean(); return $buf; } /** * 公共方法 withdraw * 生成单帧的图片[文件] * 参数 * $frame 数值,提取的帧号 * $filename 字符串,目标文件名,缺省为空(不生成文件) * 返回 字符串,图片数据 **/ function withdraw($frame=0, $filename='') { if($frame > $this->frame-1) $frame = 0; $this->image_header(); $this->control_extension($frame); $this->image_frame($frame); $buf = $this->image_end(); if(!empty($filename)) file_put_contents($filename, $buf); return $buf; } } $p = new TGif('old.gif'); //$p->info(); echo $p->withdraw(0, 'hello.gif'); //print_r($p->image); ?> </code>
try imagemagick
使用 imagemagick就很简单了