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| Copyright: | (c) 2006 phpBB Group |
| License: | http://opensource.org/licenses/gpl-license.php GNU Public License |
| Version: | $Id$ |
| File Size: | 392 lines (86 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
captcha:: (6 methods):
captcha()
execute()
randomise()
png_chunk()
create_png()
define_filtered_pngs()
| captcha() X-Ref |
| Define filtered pngs on init |
| execute($code, $seed) X-Ref |
| Create the image containing $code with a seed of $seed |
| randomise($scanline, $width) X-Ref |
| This is designed to randomise the pixels of the image data within certain limits so as to keep it readable. It also varies the image width a little |
| png_chunk($length, $type, $data) X-Ref |
| This creates a chunk of the given type, with the given data of the given length adding the relevant crc |
| create_png($raw_image, $width, $height) X-Ref |
| Creates greyscale 8bit png - The PNG spec can be found at http://www.libpng.org/pub/png/spec/PNG-Contents.html we use png because it's a fully recognised open standard and supported by practically all modern browsers and OSs |
| define_filtered_pngs() X-Ref |
| png image data Each 'data' element is base64_encoded uncompressed IDAT |
| Generated: Wed Oct 2 15:03:47 2013 | Cross-referenced by PHPXref 0.7.1 |