最好是素材图片大小尺寸一样，生成的GIF图片才好看，同样，提取的图片也要好看些。
提取类：GifFrameExtractor
<?php
namespace tools;
/**
* Extract the frames (and their duration) of a GIF
*
* @version 1.5
* @link https://github.com/Sybio/GifFrameExtractor
* @author Sybio (Clément Guillemain / @Sybio01)
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @copyright Clément Guillemain
*/
class GifFrameExtractor
{
// Properties
// ===================================================================================
/**
* @var resource
*/
private $gif;
/**
* @var array
*/
private $frames;
/**
* @var array
*/
private $frameDurations;
/**
* @var array
*/
private $frameImages;
/**
* @var array
*/
private $framePositions;
/**
* @var array
*/
private $frameDimensions;
/**
* @var integer
*
* (old: $this->index)
*/
private $frameNumber;
/**
* @var array
*
* (old: $this->imagedata)
*/
private $frameSources;
/**
* @var array
*
* (old: $this->fileHeader)
*/
private $fileHeader;
/**
* @var integer The reader pointer in the file source
*
* (old: $this->pointer)
*/
private $pointer;
/**
* @var integer
*/
private $gifMaxWidth;
/**
* @var integer
*/
private $gifMaxHeight;
/**
* @var integer
*/
private $totalDuration;
/**
* @var integer
*/
private $handle;
/**
* @var array
*
* (old: globaldata)
*/
private $globaldata;
/**
* @var array
*
* (old: orgvars)
*/
private $orgvars;
// Methods
// ===================================================================================
/**
* Extract frames of a GIF
*
* @param string $filename GIF filename path
* @param boolean $originalFrames Get original frames (with transparent background)
*
* @return array
*/
public function extract($filename, $originalFrames = false)
{
if (!self::isAnimatedGif($filename)) {
throw new \Exception('The GIF image you are trying to explode is not animated !');
}
$this->reset();
$this->parseFramesInfo($filename);
$prevImg = null;
for ($i = 0; $i < count($this->frameSources); $i++) {
$this->frames[$i] = array();
$this->frameDurations[$i] = $this->frames[$i]['duration'] = $this->frameSources[$i]['delay_time'];
$img = imagecreatefromstring($this->fileHeader["gifheader"] . $this->frameSources[$i]["graphicsextension"] . $this->frameSources[$i]["imagedata"] . chr(0x3b));
if (!$originalFrames) {
if ($i > 0) {
$prevImg = $this->frames[$i - 1]['image'];
} else {
$prevImg = $img;
}
$sprite = imagecreate($this->gifMaxWidth, $this->gifMaxHeight);
imagesavealpha($sprite, true);
$transparent = imagecolortransparent($prevImg);
if ($transparent > -1 && imagecolorstotal($prevImg) > $transparent) {
$actualTrans = imagecolorsforindex($prevImg, $transparent);
imagecolortransparent($sprite, imagecolorallocate($sprite, $actualTrans['red'], $actualTrans['green'], $actualTrans['blue']));
}
if ((int)$this->frameSources[$i]['disposal_method'] == 1 && $i > 0) {
imagecopy($sprite, $prevImg, 0, 0, 0, 0, $this->gifMaxWidth, $this->gifMaxHeight);
}
imagecopyresampled($sprite, $img, $this->frameSources[$i]["offset_left"], $this->frameSources[$i]["offset_top"], 0, 0, $this->gifMaxWidth, $this->gifMaxHeight, $this->gifMaxWidth, $this->gifMaxHeight);
$img = $sprite;
}
$this->frameImages[$i] = $this->frames[$i]['image'] = $img;
}
return $this->frames;
}
/**
* Check if a GIF file at a path is animated or not
*
* @param string $filename GIF path
*/
public static function isAnimatedGif($filename)
{
if (!($fh = @fopen($filename, 'rb'))) {
return false;
}
$count = 0;
while (!feof($fh) && $count < 2) {
$chunk = fread($fh, 1024 * 100); //read 100kb at a time
$count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk, $matches);
}
fclose($fh);
return $count > 1;
}
// Internals
// ===================================================================================
/**
* Parse the frame informations contained in the GIF file
*
* @param string $filename GIF filename path
*/
private function parseFramesInfo($filename)
{
$this->openFile($filename);
$this->parseGifHeader();
$this->parseGraphicsExtension(0);
$this->getApplicationData();
$this->getApplicationData();
$this->getFrameString(0);
$this->parseGraphicsExtension(1);
$this->getCommentData();
$this->getApplicationData();
$this->getFrameString(1);
while (!$this->checkByte(0x3b) && !$this->checkEOF()) {
$this->getCommentData(1);
$this->parseGraphicsExtension(2);
$this->getFrameString(2);
$this->getApplicationData();
}
}
/**
* Parse the gif header (old: get_gif_header)
*/
private function parseGifHeader()
{
$this->pointerForward(10);
if ($this->readBits(($mybyte = $this->readByteInt()), 0, 1) == 1) {
$this->pointerForward(2);
$this->pointerForward(pow(2, $this->readBits($mybyte, 5, 3) + 1) * 3);
} else {
$this->pointerForward(2);
}
$this->fileHeader["gifheader"] = $this->dataPart(0, $this->pointer);
// Decoding
$this->orgvars["gifheader"] = $this->fileHeader["gifheader"];
$this->orgvars["background_color"] = $this->orgvars["gifheader"][11];
}
/**
* Parse the application data of the frames (old: get_application_data)
*/
private function getApplicationData()
{
$startdata = $this->readByte(2);
if ($startdata == chr(0x21) . chr(0xff)) {
$start = $this->pointer - 2;
$this->pointerForward($this->readByteInt());
$this->readDataStream($this->readByteInt());
$this->fileHeader["applicationdata"] = $this->dataPart($start, $this->pointer - $start);
} else {
$this->pointerRewind(2);
}
}
/**
* Parse the comment data of the frames (old: get_comment_data)
*/
private function getCommentData()
{
$startdata = $this->readByte(2);
if ($startdata == chr(0x21) . chr(0xfe)) {
$start = $this->pointer - 2;
$this->readDataStream($this->readByteInt());
$this->fileHeader["commentdata"] = $this->dataPart($start, $this->pointer - $start);
} else {
$this->pointerRewind(2);
}
}
/**
* Parse the graphic extension of the frames (old: get_graphics_extension)
*
* @param integer $type
*/
private function parseGraphicsExtension($type)
{
$startdata = $this->readByte(2);
if ($startdata == chr(0x21) . chr(0xf9)) {
$start = $this->pointer - 2;
$this->pointerForward($this->readByteInt());
$this->pointerForward(1);
if ($type == 2) {
$this->frameSources[$this->frameNumber]["graphicsextension"] = $this->dataPart($start, $this->pointer - $start);
} elseif ($type == 1) {
$this->orgvars["hasgx_type_1"] = 1;
$this->globaldata["graphicsextension"] = $this->dataPart($start, $this->pointer - $start);
} elseif ($type == 0) {
$this->orgvars["hasgx_type_0"] = 1;
$this->globaldata["graphicsextension_0"] = $this->dataPart($start, $this->pointer - $start);
}
} else {
$this->pointerRewind(2);
}
}
/**
* Get the full frame string block (old: get_image_block)
*
* @param integer $type
*/
private function getFrameString($type)
{
if ($this->checkByte(0x2c)) {
$start = $this->pointer;
$this->pointerForward(9);
if ($this->readBits(($mybyte = $this->readByteInt()), 0, 1) == 1) {
$this->pointerForward(pow(2, $this->readBits($mybyte, 5, 3) + 1) * 3);
}
$this->pointerForward(1);
$this->readDataStream($this->readByteInt());
$this->frameSources[$this->frameNumber]["imagedata"] = $this->dataPart($start, $this->pointer - $start);
if ($type == 0) {
$this->orgvars["hasgx_type_0"] = 0;
if (isset($this->globaldata["graphicsextension_0"])) {
$this->frameSources[$this->frameNumber]["graphicsextension"] = $this->globaldata["graphicsextension_0"];
} else {
$this->frameSources[$this->frameNumber]["graphicsextension"] = null;
}
unset($this->globaldata["graphicsextension_0"]);
} elseif ($type == 1) {
if (isset($this->orgvars["hasgx_type_1"]) && $this->orgvars["hasgx_type_1"] == 1) {
$this->orgvars["hasgx_type_1"] = 0;
$this->frameSources[$this->frameNumber]["graphicsextension"] = $this->globaldata["graphicsextension"];
unset($this->globaldata["graphicsextension"]);
} else {
$this->orgvars["hasgx_type_0"] = 0;
$this->frameSources[$this->frameNumber]["graphicsextension"] = $this->globaldata["graphicsextension_0"];
unset($this->globaldata["graphicsextension_0"]);
}
}
$this->parseFrameData();
$this->frameNumber++;
}
}
/**
* Parse frame data string into an array (old: parse_image_data)
*/
private function parseFrameData()
{
$this->frameSources[$this->frameNumber]["disposal_method"] = $this->getImageDataBit("ext", 3, 3, 3);
$this->frameSources[$this->frameNumber]["user_input_flag"] = $this->getImageDataBit("ext", 3, 6, 1);
$this->frameSources[$this->frameNumber]["transparent_color_flag"] = $this->getImageDataBit("ext", 3, 7, 1);
$this->frameSources[$this->frameNumber]["delay_time"] = $this->dualByteVal($this->getImageDataByte("ext", 4, 2));
$this->totalDuration += (int)$this->frameSources[$this->frameNumber]["delay_time"];
$this->frameSources[$this->frameNumber]["transparent_color_index"] = ord($this->getImageDataByte("ext", 6, 1));
$this->frameSources[$this->frameNumber]["offset_left"] = $this->dualByteVal($this->getImageDataByte("dat", 1, 2));
$this->frameSources[$this->frameNumber]["offset_top"] = $this->dualByteVal($this->getImageDataByte("dat", 3, 2));
$this->frameSources[$this->frameNumber]["width"] = $this->dualByteVal($this->getImageDataByte("dat", 5, 2));
$this->frameSources[$this->frameNumber]["height"] = $this->dualByteVal($this->getImageDataByte("dat", 7, 2));
$this->frameSources[$this->frameNumber]["local_color_table_flag"] = $this->getImageDataBit("dat", 9, 0, 1);
$this->frameSources[$this->frameNumber]["interlace_flag"] = $this->getImageDataBit("dat", 9, 1, 1);
$this->frameSources[$this->frameNumber]["sort_flag"] = $this->getImageDataBit("dat", 9, 2, 1);
$this->frameSources[$this->frameNumber]["color_table_size"] = pow(2, $this->getImageDataBit("dat", 9, 5, 3) + 1) * 3;
$this->frameSources[$this->frameNumber]["color_table"] = substr($this->frameSources[$this->frameNumber]["imagedata"], 10, $this->frameSources[$this->frameNumber]["color_table_size"]);
$this->frameSources[$this->frameNumber]["lzw_code_size"] = ord($this->getImageDataByte("dat", 10, 1));
$this->framePositions[$this->frameNumber] = array(
'x' => $this->frameSources[$this->frameNumber]["offset_left"],
'y' => $this->frameSources[$this->frameNumber]["offset_top"],
);
$this->frameDimensions[$this->frameNumber] = array(
'width' => $this->frameSources[$this->frameNumber]["width"],
'height' => $this->frameSources[$this->frameNumber]["height"],
);
// Decoding
$this->orgvars[$this->frameNumber]["transparent_color_flag"] = $this->frameSources[$this->frameNumber]["transparent_color_flag"];
$this->orgvars[$this->frameNumber]["transparent_color_index"] = $this->frameSources[$this->frameNumber]["transparent_color_index"];
$this->orgvars[$this->frameNumber]["delay_time"] = $this->frameSources[$this->frameNumber]["delay_time"];
$this->orgvars[$this->frameNumber]["disposal_method"] = $this->frameSources[$this->frameNumber]["disposal_method"];
$this->orgvars[$this->frameNumber]["offset_left"] = $this->frameSources[$this->frameNumber]["offset_left"];
$this->orgvars[$this->frameNumber]["offset_top"] = $this->frameSources[$this->frameNumber]["offset_top"];
// Updating the max width
if ($this->gifMaxWidth < $this->frameSources[$this->frameNumber]["width"]) {
$this->gifMaxWidth = $this->frameSources[$this->frameNumber]["width"];
}
// Updating the max height
if ($this->gifMaxHeight < $this->frameSources[$this->frameNumber]["height"]) {
$this->gifMaxHeight = $this->frameSources[$this->frameNumber]["height"];
}
}
/**
* Get the image data byte (old: get_imagedata_byte)
*
* @param string $type
* @param integer $start
* @param integer $length
*
* @return string
*/
private function getImageDataByte($type, $start, $length)
{
if ($type == "ext") {
return substr($this->frameSources[$this->frameNumber]["graphicsextension"], $start, $length);
}
// "dat"
return substr($this->frameSources[$this->frameNumber]["imagedata"], $start, $length);
}
/**
* Get the image data bit (old: get_imagedata_bit)
*
* @param string $type
* @param integer $byteIndex
* @param integer $bitStart
* @param integer $bitLength
*
* @return number
*/
private function getImageDataBit($type, $byteIndex, $bitStart, $bitLength)
{
if ($type == "ext") {
return $this->readBits(ord(substr($this->frameSources[$this->frameNumber]["graphicsextension"], $byteIndex, 1)), $bitStart, $bitLength);
}
// "dat"
return $this->readBits(ord(substr($this->frameSources[$this->frameNumber]["imagedata"], $byteIndex, 1)), $bitStart, $bitLength);
}
/**
* Return the value of 2 ASCII chars (old: dualbyteval)
*
* @param string $s
*
* @return integer
*/
private function dualByteVal($s)
{
$i = ord($s[1]) * 256 + ord($s[0]);
return $i;
}
/**
* Read the data stream (old: read_data_stream)
*
* @param integer $firstLength
*/
private function readDataStream($firstLength)
{
$this->pointerForward($firstLength);
$length = $this->readByteInt();
if ($length != 0) {
while ($length != 0) {
$this->pointerForward($length);
$length = $this->readByteInt();
}
}
}
/**
* Open the gif file (old: loadfile)
*
* @param string $filename
*/
private function openFile($filename)
{
$this->handle = fopen($filename, "rb");
$this->pointer = 0;
$imageSize = getimagesize($filename);
$this->gifWidth = $imageSize[0];
$this->gifHeight = $imageSize[1];
}
/**
* Close the read gif file (old: closefile)
*/
private function closeFile()
{
fclose($this->handle);
$this->handle = 0;
}
/**
* Read the file from the beginning to $byteCount in binary (old: readbyte)
*
* @param integer $byteCount
*
* @return string
*/
private function readByte($byteCount)
{
$data = fread($this->handle, $byteCount);
$this->pointer += $byteCount;
return $data;
}
/**
* Read a byte and return ASCII value (old: readbyte_int)
*
* @return integer
*/
private function readByteInt()
{
$data = fread($this->handle, 1);
$this->pointer++;
return ord($data);
}
/**
* Convert a $byte to decimal (old: readbits)
*
* @param string $byte
* @param integer $start
* @param integer $length
*
* @return number
*/
private function readBits($byte, $start, $length)
{
$bin = str_pad(decbin($byte), 8, "0", STR_PAD_LEFT);
$data = substr($bin, $start, $length);
return bindec($data);
}
/**
* Rewind the file pointer reader (old: p_rewind)
*
* @param integer $length
*/
private function pointerRewind($length)
{
$this->pointer -= $length;
fseek($this->handle, $this->pointer);
}
/**
* Forward the file pointer reader (old: p_forward)
*
* @param integer $length
*/
private function pointerForward($length)
{
$this->pointer += $length;
fseek($this->handle, $this->pointer);
}
/**
* Get a section of the data from $start to $start + $length (old: datapart)
*
* @param integer $start
* @param integer $length
*
* @return string
*/
private function dataPart($start, $length)
{
fseek($this->handle, $start);
$data = fread($this->handle, $length);
fseek($this->handle, $this->pointer);
return $data;
}
/**
* Check if a character if a byte (old: checkbyte)
*
* @param integer $byte
*
* @return boolean
*/
private function checkByte($byte)
{
if (fgetc($this->handle) == chr($byte)) {
fseek($this->handle, $this->pointer);
return true;
}
fseek($this->handle, $this->pointer);
return false;
}
/**
* Check the end of the file (old: checkEOF)
*
* @return boolean
*/
private function checkEOF()
{
if (fgetc($this->handle) === false) {
return true;
}
fseek($this->handle, $this->pointer);
return false;
}
/**
* Reset and clear this current object
*/
private function reset()
{
$this->gif = null;
$this->totalDuration = $this->gifMaxHeight = $this->gifMaxWidth = $this->handle = $this->pointer = $this->frameNumber = 0;
$this->frameDimensions = $this->framePositions = $this->frameImages = $this->frameDurations = $this->globaldata = $this->orgvars = $this->frames = $this->fileHeader = $this->frameSources = array();
}
// Getter / Setter
// ===================================================================================
/**
* Get the total of all added frame duration
*
* @return integer
*/
public function getTotalDuration()
{
return $this->totalDuration;
}
/**
* Get the number of extracted frames
*
* @return integer
*/
public function getFrameNumber()
{
return $this->frameNumber;
}
/**
* Get the extracted frames (images and durations)
*
* @return array
*/
public function getFrames()
{
return $this->frames;
}
/**
* Get the extracted frame positions
*
* @return array
*/
public function getFramePositions()
{
return $this->framePositions;
}
/**
* Get the extracted frame dimensions
*
* @return array
*/
public function getFrameDimensions()
{
return $this->frameDimensions;
}
/**
* Get the extracted frame images
*
* @return array
*/
public function getFrameImages()
{
return $this->frameImages;
}
/**
* Get the extracted frame durations
*
* @return array
*/
public function getFrameDurations()
{
return $this->frameDurations;
}
}生成类：Gifcreator
<?php
namespace tools;
/**
* Create an animated GIF from multiple images
*
* @version 1.0
* @link https://github.com/Sybio/GifCreator
* @author Sybio (Clément Guillemain / @Sybio01)
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @copyright Clément Guillemain
*/
class Gifcreator
{
/**
* @var string The gif string source (old: this->GIF)
*/
private $gif;
/**
* @var string Encoder version (old: this->VER)
*/
private $version;
/**
* @var boolean Check the image is build or not (old: this->IMG)
*/
private $imgBuilt;
/**
* @var array Frames string sources (old: this->BUF)
*/
private $frameSources;
/**
* @var integer Gif loop (old: this->LOP)
*/
private $loop;
/**
* @var integer Gif dis (old: this->DIS)
*/
private $dis;
/**
* @var integer Gif color (old: this->COL)
*/
private $colour;
/**
* @var array (old: this->ERR)
*/
private $errors;
// Methods
// ===================================================================================
/**
* Constructor
*/
public function __construct()
{
$this->reset();
// Static data
$this->version = 'GifCreator: Under development';
$this->errors = array(
'ERR00' => 'Does not supported function for only one image.',
'ERR01' => 'Source is not a GIF image.',
'ERR02' => 'You have to give resource image variables, image URL or image binary sources in $frames array.',
'ERR03' => 'Does not make animation from animated GIF source.',
);
}
/**
* Create the GIF string (old: GIFEncoder)
*
* @param array $frames An array of frame: can be file paths, resource image variables, binary sources or image URLs
* @param array $durations An array containing the duration of each frame
* @param integer $loop Number of GIF loops before stopping animation (Set 0 to get an infinite loop)
*
* @return string The GIF string source
*/
public function create($frames = array(), $durations = array(), $loop = 0)
{
if (!is_array($frames) && !is_array($GIF_tim)) {
throw new \Exception($this->version.': '.$this->errors['ERR00']);
}
$this->loop = ($loop > -1) ? $loop : 0;
$this->dis = 2;
for ($i = 0; $i < count($frames); $i++) {
if (is_resource($frames[$i])) { // Resource var
$resourceImg = $frames[$i];
ob_start();
imagegif($frames[$i]);
$this->frameSources[] = ob_get_contents();
ob_end_clean();
} elseif (is_string($frames[$i])) { // File path or URL or Binary source code
if (file_exists($frames[$i]) || filter_var($frames[$i], FILTER_VALIDATE_URL)) { // File path
$frames[$i] = file_get_contents($frames[$i]);
}
$resourceImg = imagecreatefromstring($frames[$i]);
ob_start();
imagegif($resourceImg);
$this->frameSources[] = ob_get_contents();
ob_end_clean();
} else { // Fail
throw new \Exception($this->version.': '.$this->errors['ERR02'].' ('.$mode.')');
}
if ($i == 0) {
$colour = imagecolortransparent($resourceImg);
}
if (substr($this->frameSources[$i], 0, 6) != 'GIF87a' && substr($this->frameSources[$i], 0, 6) != 'GIF89a') {
throw new \Exception($this->version.': '.$i.' '.$this->errors['ERR01']);
}
for ($j = (13 + 3 * (2 << (ord($this->frameSources[$i] { 10 }) & 0x07))), $k = TRUE; $k; $j++) {
switch ($this->frameSources[$i] { $j }) {
case '!':
if ((substr($this->frameSources[$i], ($j + 3), 8)) == 'NETSCAPE') {
throw new \Exception($this->version.': '.$this->errors['ERR03'].' ('.($i + 1).' source).');
}
break;
case ';':
$k = false;
break;
}
}
unset($resourceImg);
}
if (isset($colour)) {
$this->colour = $colour;
} else {
$red = $green = $blue = 0;
$this->colour = ($red > -1 && $green > -1 && $blue > -1) ? ($red | ($green << 8) | ($blue << 16)) : -1;
}
$this->gifAddHeader();
//d(count($this->frameSources));
for ($i = 0; $i < count($this->frameSources); $i++) {
$this->addGifFrames($i, $durations[$i]);
}
$this->gifAddFooter();
return $this->gif;
}
// Internals
// ===================================================================================
/**
* Add the header gif string in its source (old: GIFAddHeader)
*/
public function gifAddHeader()
{
$cmap = 0;
if (ord($this->frameSources[0] { 10 }) & 0x80) {
$cmap = 3 * (2 << (ord($this->frameSources[0] { 10 }) & 0x07));
$this->gif .= substr($this->frameSources[0], 6, 7);
$this->gif .= substr($this->frameSources[0], 13, $cmap);
$this->gif .= "!\377\13NETSCAPE2.0\3\1".$this->encodeAsciiToChar($this->loop)."\0";
}
}
/**
* Add the frame sources to the GIF string (old: GIFAddFrames)
*
* @param integer $i
* @param integer $d
*/
public function addGifFrames($i, $d)
{
$Locals_str = 13 + 3 * (2 << (ord($this->frameSources[ $i ] { 10 }) & 0x07));
$Locals_end = strlen($this->frameSources[$i]) - $Locals_str - 1;
$Locals_tmp = substr($this->frameSources[$i], $Locals_str, $Locals_end);
$Global_len = 2 << (ord($this->frameSources[0 ] { 10 }) & 0x07);
$Locals_len = 2 << (ord($this->frameSources[$i] { 10 }) & 0x07);
$Global_rgb = substr($this->frameSources[0], 13, 3 * (2 << (ord($this->frameSources[0] { 10 }) & 0x07)));
$Locals_rgb = substr($this->frameSources[$i], 13, 3 * (2 << (ord($this->frameSources[$i] { 10 }) & 0x07)));
$Locals_ext = "!\xF9\x04".chr(($this->dis << 2) + 0).chr(($d >> 0 ) & 0xFF).chr(($d >> 8) & 0xFF)."\x0\x0";
if ($this->colour > -1 && ord($this->frameSources[$i] { 10 }) & 0x80) {
for ($j = 0; $j < (2 << (ord($this->frameSources[$i] { 10 } ) & 0x07)); $j++) {
if (ord($Locals_rgb { 3 * $j + 0 }) == (($this->colour >> 16) & 0xFF) &&
ord($Locals_rgb { 3 * $j + 1 }) == (($this->colour >> 8) & 0xFF) &&
ord($Locals_rgb { 3 * $j + 2 }) == (($this->colour >> 0) & 0xFF)
) {
$Locals_ext = "!\xF9\x04".chr(($this->dis << 2) + 1).chr(($d >> 0) & 0xFF).chr(($d >> 8) & 0xFF).chr($j)."\x0";
break;
}
}
}
switch ($Locals_tmp { 0 }) {
case '!':
$Locals_img = substr($Locals_tmp, 8, 10);
$Locals_tmp = substr($Locals_tmp, 18, strlen($Locals_tmp) - 18);
break;
case ',':
$Locals_img = substr($Locals_tmp, 0, 10);
$Locals_tmp = substr($Locals_tmp, 10, strlen($Locals_tmp) - 10);
break;
}
if (ord($this->frameSources[$i] { 10 }) & 0x80 && $this->imgBuilt) {
if ($Global_len == $Locals_len) {
if ($this->gifBlockCompare($Global_rgb, $Locals_rgb, $Global_len)) {
$this->gif .= $Locals_ext.$Locals_img.$Locals_tmp;
} else {
$byte = ord($Locals_img { 9 });
$byte |= 0x80;
$byte &= 0xF8;
$byte |= (ord($this->frameSources[0] { 10 }) & 0x07);
$Locals_img { 9 } = chr($byte);
$this->gif .= $Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp;
}
} else {
$byte = ord($Locals_img { 9 });
$byte |= 0x80;
$byte &= 0xF8;
$byte |= (ord($this->frameSources[$i] { 10 }) & 0x07);
$Locals_img { 9 } = chr($byte);
$this->gif .= $Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp;
}
} else {
$this->gif .= $Locals_ext.$Locals_img.$Locals_tmp;
}
$this->imgBuilt = true;
}
/**
* Add the gif string footer char (old: GIFAddFooter)
*/
public function gifAddFooter()
{
$this->gif .= ';';
}
/**
* Compare two block and return the version (old: GIFBlockCompare)
*
* @param string $globalBlock
* @param string $localBlock
* @param integer $length
*
* @return integer
*/
public function gifBlockCompare($globalBlock, $localBlock, $length)
{
for ($i = 0; $i < $length; $i++) {
if ($globalBlock { 3 * $i + 0 } != $localBlock { 3 * $i + 0 } ||
$globalBlock { 3 * $i + 1 } != $localBlock { 3 * $i + 1 } ||
$globalBlock { 3 * $i + 2 } != $localBlock { 3 * $i + 2 }) {
return 0;
}
}
return 1;
}
/**
* Encode an ASCII char into a string char (old: GIFWord)
*
* $param integer $char ASCII char
*
* @return string
*/
public function encodeAsciiToChar($char)
{
return (chr($char & 0xFF).chr(($char >> 8) & 0xFF));
}
/**
* Reset and clean the current object
*/
public function reset()
{
$this->frameSources;
$this->gif = 'GIF89a'; // the GIF header
$this->imgBuilt = false;
$this->loop = 0;
$this->dis = 2;
$this->colour = -1;
}
// Getter / Setter
// ===================================================================================
/**
* Get the final GIF image string (old: GetAnimation)
*
* @return string
*/
public function getGif()
{
return $this->gif;
}
}使用方式
后端接口
<?php
namespace app\index\controller;
use think\Controller;
use tools\Gifcreator;
use tools\GifFrameExtractor;
class Gif extends Controller
{
/**
* @param array $file
* @param string $savePath
* @return array|bool
* @desc 上传处理图片
*/
private function upload($file = array(), $savePath = 'uploads/')
{
if (empty($file)) {
return false;
}
$savePath = $savePath . date('Ymd') . '/';
if (!file_exists($savePath)) {
mkdir($savePath, 0755, true);
}
// 允许上传的图片后缀
$allowedExts = array("gif", "jpeg", "jpg", "png");
$allowedType = array("image/jpeg", "image/gif", "image/jpg", "image/x-png", "image/png");
$maxSize = 2 * 1024 * 1024;
$uploaded = array('code' => 200, 'data' => array(), 'error' => array());
//名称
foreach ($file['name'] as $key => $name) {
$temp = explode(".", $name);
$extension = end($temp);
if (in_array($file["type"][$key], $allowedType) && in_array($extension, $allowedExts)) {
if ($file["size"][$key] > $maxSize) {
foreach ($uploaded['data'] as $v) {
@unlink($v['saveName']);
}
$uploaded['error'][] = array(
'file' => $name,
'error_msg' => "Current picture size：" . $this->format_bytes($file["size"][$key]) . ". Picture size exceeds maximum limit：" . $this->format_bytes($maxSize)
);
$uploaded['code'] = 201;
}
if ($file["error"][$key] > 0) {
foreach ($uploaded['data'] as $v) {
@unlink($v['saveName']);
}
$uploaded['error'][] = array(
'file' => $name,
'error_msg' => "Upload error：" . $this->getError($file["error"][$key])
);
$uploaded['code'] = 201;
} else {
$saveName = $savePath . uniqid() . '.' . $extension;
move_uploaded_file($file["tmp_name"][$key], $saveName);
$uploaded['data'][] = array(
'originName' => $name,
'saveName' => $saveName,
'size' => $file["size"][$key],
'type' => $file["type"][$key]
);
}
} else {
foreach ($uploaded['data'] as $v) {
@unlink($v['saveName']);
}
$uploaded['error'][] = array(
'file' => $name,
'error_msg' => "Illegal file format：" . $extension
);
$uploaded['code'] = 201;
}
}
return $uploaded;
}
/**
* @param $size
* @param string $delimiter
* @return string
* @desc 字节转换
*/
private function format_bytes($size, $delimiter = '')
{
$units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
for ($i = 0; $size >= 1024 && $i < 5; $i++) $size /= 1024;
return round($size, 2) . $delimiter . $units[$i];
}
/**
* @param string $error
* @return string
* @desc 获取错误信息
*/
private function getError($error = '')
{
switch ($error) {
case 1:
// 文件大小超出了服务器的空间大小
$err = "The file is too large (server).";
break;
case 2:
// 要上传的文件大小超出浏览器限制
$err = "The file is too large (form).";
break;
case 3:
// 文件仅部分被上传
$err = "The file was only partially uploaded.";
break;
case 4:
// 没有找到要上传的文件
$err = "No file was uploaded.";
break;
case 5:
// 服务器临时文件夹丢失
$err = "The servers temporary folder is missing.";
break;
case 6:
// 文件写入到临时文件夹出错
$err = "Failed to write to the temporary folder.";
break;
default:
$err = "";
}
return $err;
}
/**
* @return mixed
* @desc 视图文件
*/
public function createGifView()
{
return $this->fetch();
}
/**
* @return false|string
* @throws \Exception
* @desc 生成GIF
*/
public function createGif()
{
$files = $_FILES['files'];
$imgs = $this->upload($files);
if (200 != $imgs['code']) {
return json_encode($imgs['error']);
}
$picArr = [];
$durations = array();
foreach ($imgs['data'] as $k => $v) {
$picArr[] = $v['saveName'];
//过度时间
$durations[] = 50;
}
$gitCreator = new Gifcreator();
$gitCreator->create($picArr, $durations, 0);
$gifBinary = $gitCreator->getGif();
//保存路径
$gif_path = 'uploads/' . date('Ymd') . '/';
if (!file_exists($gif_path)) {
mkdir($gif_path, 0755, true);
}
$gifName = $gif_path . uniqid() . '.gif';
file_put_contents($gifName, $gifBinary);
$data = ['code' => 200, 'msg' => 'success', 'data' => array('url' => $gifName)];
//echo json_encode($data);
echo "<img src='/$gifName'>";
}
/**
* @throws \Exception
* @desc 提取GIF
*/
public function extractor()
{
$gfe = new GifFrameExtractor();
//gif图片地址
$gfe->extract('./uploads/20200429/5ea98e6cd8442.gif', true);
//gif图片帧数
$frameImages = $gfe->getFrameImages();
//过度时间
$frameDurations = $gfe->getFrameDurations();
//保存路径
$savePath = 'uploads/gifFrameExtractor/' . date('Ymd') . '/';
if (!file_exists($savePath)) {
mkdir($savePath, 0755, true);
}
//保存
foreach ($frameImages as $key => $image) {
$saveName = $savePath . $key . ".jpeg";
imagejpeg($image, $saveName);
echo "<img src='/$saveName'>";
}
}
}前端代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>gif图片生成</title>
</head>
<body>
<form method="post" action="{:url('createGif')}" enctype="multipart/form-data">
<input type="file" name="files[]" multiple>
<button>上传</button>
</form>
</body>
</html>