-
Notifications
You must be signed in to change notification settings - Fork 0
/
GIFEncoder.class.php
271 lines (245 loc) · 8.89 KB
/
GIFEncoder.class.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
<?php
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: Formerly known as:::
:: GIFEncoder Version 2.0 by László Zsidi, http://gifs.hu
::
:: This class is a rewritten 'GifMerge.class.php' version.
::
:: Modification:
:: - Simplified and easy code,
:: - Ultra fast encoding,
:: - Built-in errors,
:: - Stable working
::
::
:: Updated at 2007. 02. 13. '00.05.AM'
::
::
::
:: Try on-line GIFBuilder Form demo based on GIFEncoder.
::
:: http://gifs.hu/phpclasses/demos/GifBuilder/
::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
*/
/**
* Encode animated gifs
*/
class AnimatedGif {
/**
* The built gif image
* @var resource
*/
private $image = '';
/**
* The array of images to stack
* @var array
*/
private $buffer = Array();
/**
* How many times to loop? 0 = infinite
* @var int
*/
private $number_of_loops = 0;
/**
*
* @var int
*/
private $DIS = 2;
/**
* Which colour is transparent
* @var int
*/
private $transparent_colour = -1;
/**
* Is this the first frame
* @var int
*/
private $first_frame = TRUE;
/**
* Encode an animated gif
* @param array $source_images An array of binary source images
* @param array $image_delays The delays associated with the source images
* @param type $number_of_loops The number of times to loop
* @param int $transparent_colour_red
* @param int $transparent_colour_green
* @param int $transparent_colour_blue
*/
function __construct(array $source_images, array $image_delays, $number_of_loops, $transparent_colour_red = -1, $transparent_colour_green = -1, $transparent_colour_blue = -1) {
/**
* I have no idea what these even do, they appear to do nothing to the image so far
*/
$transparent_colour_red = 0;
$transparent_colour_green = 0;
$transparent_colour_blue = 0;
$this->number_of_loops = ( $number_of_loops > -1 ) ? $number_of_loops : 0;
$this->set_transparent_colour($transparent_colour_red, $transparent_colour_green, $transparent_colour_blue);
$this->buffer_images($source_images);
$this->addHeader();
for ($i = 0; $i < count($this->buffer); $i++) {
$this->addFrame($i, $image_delays [$i]);
}
}
/**
* Set the transparent colour
* @param int $red
* @param int $green
* @param int $blue
*/
private function set_transparent_colour($red, $green, $blue){
$this->transparent_colour = ( $red > -1 && $green > -1 && $blue > -1 ) ?
( $red | ( $green << 8 ) | ( $blue << 16 ) ) : -1;
}
/**
* Buffer the images and check to make sure they are vaild
* @param array $source_images the array of source images
* @throws Exception
*/
private function buffer_images($source_images) {
for ($i = 0; $i < count($source_images); $i++) {
$this->buffer [] = $source_images [$i];
if (substr($this->buffer [$i], 0, 6) != "GIF87a" && substr($this->buffer [$i], 0, 6) != "GIF89a") {
throw new Exception('Image at position ' . $i. ' is not a gif');
}
for ($j = ( 13 + 3 * ( 2 << ( ord($this->buffer [$i] { 10 }) & 0x07 ) ) ), $k = TRUE; $k; $j++) {
switch ($this->buffer [$i] { $j }) {
case "!":
if (( substr($this->buffer [$i], ( $j + 3), 8) ) == "NETSCAPE") {
throw new Exception('You cannot make an animation from an animated gif.');
}
break;
case ";":
$k = FALSE;
break;
}
}
}
}
/**
* Add the gif header to the image
*/
private function addHeader() {
$cmap = 0;
$this->image = 'GIF89a';
if (ord($this->buffer [0] { 10 }) & 0x80) {
$cmap = 3 * ( 2 << ( ord($this->buffer [0] { 10 }) & 0x07 ) );
$this->image .= substr($this->buffer [0], 6, 7);
$this->image .= substr($this->buffer [0], 13, $cmap);
$this->image .= "!\377\13NETSCAPE2.0\3\1" . $this->word($this->number_of_loops) . "\0";
}
}
/**
* Add a frame to the animation
* @param int $frame The frame to be added
* @param int $delay The delay associated with the frame
*/
private function addFrame($frame, $delay) {
$Locals_str = 13 + 3 * ( 2 << ( ord($this->buffer [$frame] { 10 }) & 0x07 ) );
$Locals_end = strlen($this->buffer [$frame]) - $Locals_str - 1;
$Locals_tmp = substr($this->buffer [$frame], $Locals_str, $Locals_end);
$Global_len = 2 << ( ord($this->buffer [0] { 10 }) & 0x07 );
$Locals_len = 2 << ( ord($this->buffer [$frame] { 10 }) & 0x07 );
$Global_rgb = substr($this->buffer [0], 13, 3 * ( 2 << ( ord($this->buffer [0] { 10 }) & 0x07 ) ));
$Locals_rgb = substr($this->buffer [$frame], 13, 3 * ( 2 << ( ord($this->buffer [$frame] { 10 }) & 0x07 ) ));
$Locals_ext = "!\xF9\x04" . chr(( $this->DIS << 2 ) + 0) .
chr(( $delay >> 0 ) & 0xFF) . chr(( $delay >> 8 ) & 0xFF) . "\x0\x0";
if ($this->transparent_colour > -1 && ord($this->buffer [$frame] { 10 }) & 0x80) {
for ($j = 0; $j < ( 2 << ( ord($this->buffer [$frame] { 10 }) & 0x07 ) ); $j++) {
if (
ord($Locals_rgb { 3 * $j + 0 }) == ( ( $this->transparent_colour >> 16 ) & 0xFF ) &&
ord($Locals_rgb { 3 * $j + 1 }) == ( ( $this->transparent_colour >> 8 ) & 0xFF ) &&
ord($Locals_rgb { 3 * $j + 2 }) == ( ( $this->transparent_colour >> 0 ) & 0xFF )
) {
$Locals_ext = "!\xF9\x04" . chr(( $this->DIS << 2 ) + 1) .
chr(( $delay >> 0 ) & 0xFF) . chr(( $delay >> 8 ) & 0xFF) . chr($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->buffer [$frame] { 10 }) & 0x80 && $this->first_frame === FALSE) {
if ($Global_len == $Locals_len) {
if ($this->blockCompare($Global_rgb, $Locals_rgb, $Global_len)) {
$this->image .= ( $Locals_ext . $Locals_img . $Locals_tmp );
} else {
$byte = ord($Locals_img { 9 });
$byte |= 0x80;
$byte &= 0xF8;
$byte |= ( ord($this->buffer [0] { 10 }) & 0x07 );
$Locals_img { 9 } = chr($byte);
$this->image .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );
}
} else {
$byte = ord($Locals_img { 9 });
$byte |= 0x80;
$byte &= 0xF8;
$byte |= ( ord($this->buffer [$frame] { 10 }) & 0x07 );
$Locals_img { 9 } = chr($byte);
$this->image .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );
}
} else {
$this->image .= ( $Locals_ext . $Locals_img . $Locals_tmp );
}
$this->first_frame = FALSE;
}
/**
* Add the gif footer
*/
private function addFooter() {
$this->image .= ";";
}
/**
* Compare gif blocks? What is a block?
* @param type $GlobalBlock
* @param type $LocalBlock
* @param type $Len
* @return type
*/
private function blockCompare($GlobalBlock, $LocalBlock, $Len) {
for ($i = 0; $i < $Len; $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 );
}
/**
* No clue
* @param int $int
* @return string the char you meant?
*/
private function word($int) {
return ( chr($int & 0xFF) . chr(( $int >> 8 ) & 0xFF) );
}
/**
* Return the animated gif
* @return type
*/
function getAnimation() {
return $this->image;
}
/**
* Return the animated gif
* @return type
*/
function display() {
//late footer add
$this->addFooter();
header('Content-type:image/gif');
echo $this->image;
}
}