Dynamic images

**Chung Leong** · Jul 17 '05, 02:42 AM

Re: Dynamic images

Nice. I think we make better use of the client cache though, by redirecting
to the generated image. As it is, the browser has to refetch the image
everytime.

Uzytkownik "CountScubu la" <me@scantek.hot mail.com> napisal w wiadomosci
news:5F7Qb.1487 2$Lm7.4174@news svr25.news.prod igy.com...[color=blue]
> Ok, I just wrote some functions last night for a few people, I posted them
> up for whom ever wants it (free)
>
> http://www.gzentools.com/gzimg.php
>
> It is simple a way to spit out thumbs, or resized images, and to cache the
> image so it doesnt have to be rebuilt.
>
> Nothing fancy, but it could help a few people out.
>
> --
> Mike Bradley
> http://www.gzentools.com -- free online php tools
>
>[/color]

**CountScubula** · Jul 17 '05, 02:42 AM

Re: Dynamic images

"Chung Leong" <chernyshevsky@ hotmail.com> wrote in message
news:iIydnbKaXI qAXIzd4p2dnA@co mcast.com...[color=blue]
> Nice. I think we make better use of the client cache though, by[/color]
redirecting[color=blue]
> to the generated image. As it is, the browser has to refetch the image
> everytime.[/color]

Thank you,

Hmm, sounds interesting, you mean have a cache dir that is in the web server
view, and do a Location: bla.... to point to the image?

Hmm I will have to play and see, becouse as it is, if there is any change
int he source image, there is a new image generated.

also, I just added a few more functions:

title - add a caption
pan - show part of image
zoom - show a zoomed from middle portion
tile - tile the image

--
Mike Bradley
http://www.gzentools.com -- free online php tools

**FLEB** · Jul 17 '05, 02:42 AM

Re: Dynamic images

Regarding this well-known quote, often attributed to CountScubula's famous
"Sat, 24 Jan 2004 01:48:37 GMT" speech:
[color=blue]
> "Chung Leong" <chernyshevsky@ hotmail.com> wrote in message
> news:iIydnbKaXI qAXIzd4p2dnA@co mcast.com...[color=green]
>> Nice. I think we make better use of the client cache though, by[/color]
> redirecting[color=green]
>> to the generated image. As it is, the browser has to refetch the image
>> everytime.[/color]
>
> Thank you,
>
> Hmm, sounds interesting, you mean have a cache dir that is in the web server
> view, and do a Location: bla.... to point to the image?
>
> Hmm I will have to play and see, becouse as it is, if there is any change
> int he source image, there is a new image generated.
>
> also, I just added a few more functions:
>
> title - add a caption
> pan - show part of image
> zoom - show a zoomed from middle portion
> tile - tile the image[/color]

Just title the cached image uniquely --

something like:
[PATH-HASH]_[MOD-DATE].ext

where [PATH-HASH] is the full original path, run through something (md5 or
a search-replace) to purge evil chars, and [MOD-DATE] is the file's
last-modified date. When the code is run, do something like:

1.) Get all filenames containing [PATH-HASH] in the cache directory
2.) Is the latest [MOD-DATE] the same as the real file's modified-stamp?

3. Yes) Do not recreate the thumbnail. Redirect to the cached version.

3. No) Delete (unlink) all files with [PATH-HASH]_*
4. No) Create a new thumbnail, and redirect to it.

--
-- Rudy Fleminger
-- sp@mmers.and.ev il.ones.will.bo w-down-to.us
(put "Hey!" in the Subject line for priority processing!)
-- http://www.pixelsaredead.com

**CountScubula** · Jul 17 '05, 02:42 AM

Re: Dynamic images

"FLEB" <soon.the.sp@mm ers.and.evil.on es.will.bow-down-to.us> wrote in
message news:1pbg7eno9k a0z.1rltln0ileg gu$.dlg@40tude. net...[color=blue]
> Regarding this well-known quote, often attributed to CountScubula's famous
> "Sat, 24 Jan 2004 01:48:37 GMT" speech:
>
> 1.) Get all filenames containing [PATH-HASH] in the cache directory
> 2.) Is the latest [MOD-DATE] the same as the real file's modified-stamp?
>
> 3. Yes) Do not recreate the thumbnail. Redirect to the cached version.
>
> 3. No) Delete (unlink) all files with [PATH-HASH]_*
> 4. No) Create a new thumbnail, and redirect to it.
>
> --
> -- Rudy Fleminger
> -- sp@mmers.and.ev il.ones.will.bo w-down-to.us
> (put "Hey!" in the Subject line for priority processing!)
> -- http://www.pixelsaredead.com[/color]

the images are already cached and uniq named, Leong was talking about
redirecting rather than readfile. look at the script and you will
understand.

--
Mike Bradley
http://www.gzentools.com -- free online php tools

**Chung Leong** · Jul 17 '05, 02:43 AM

Re: Dynamic images

Yup, let Apache send the image, since it's pretty good at dealing with the
nitty gritty of HTTP transport (caching, validation, partial retrieval,
etc.). Also saves a trip into the PHP output buffer.

I guess you can implement it in a different set of functions, so that you
would retain the ability to send the file via PHP, in cases where you want
to control access to the images.

One more suggestion: before calling readfile(), do a session_write_c lose()
to remove the session lock if a session is opened.

Uzytkownik "CountScubu la" <me@scantek.hot mail.com> napisal w wiadomosci
news:V9kQb.1649 1$aJ4.6243@news svr25.news.prod igy.com...[color=blue]
> "Chung Leong" <chernyshevsky@ hotmail.com> wrote in message
> news:iIydnbKaXI qAXIzd4p2dnA@co mcast.com...
> Hmm, sounds interesting, you mean have a cache dir that is in the web[/color]
server[color=blue]
> view, and do a Location: bla.... to point to the image?
>
> Hmm I will have to play and see, becouse as it is, if there is any change
> int he source image, there is a new image generated.
>
> also, I just added a few more functions:
>
> title - add a caption
> pan - show part of image
> zoom - show a zoomed from middle portion
> tile - tile the image
>
>
>
> --
> Mike Bradley
> http://www.gzentools.com -- free online php tools
>
>[/color]

**CountScubula** · Jul 17 '05, 02:43 AM

Re: Dynamic images

"Chung Leong" <chernyshevsky@ hotmail.com> wrote in message
news:7o6dncz6w7-thY7dRVn-iQ@comcast.com. ..[color=blue]
> Yup, let Apache send the image, since it's pretty good at dealing with the
> nitty gritty of HTTP transport (caching, validation, partial retrieval,
> etc.). Also saves a trip into the PHP output buffer.
>[/color]

Working on it as we converse, will be in ver 1.5, I added a few things check
it out.
[color=blue]
> One more suggestion: before calling readfile(), do a session_write_c lose()
> to remove the session lock if a session is opened.[/color]

Please explain, can you elaborate?

--
Mike Bradley
http://www.gzentools.com -- free online php tools

**Dan Tripp** · Jul 17 '05, 02:44 AM

Re: Dynamic images

CountScubula wrote:[color=blue]
> "Chung Leong" <chernyshevsky@ hotmail.com> wrote in message
> news:7o6dncz6w7-thY7dRVn-iQ@comcast.com. ..
>[color=green]
>>Yup, let Apache send the image, since it's pretty good at dealing with the
>>nitty gritty of HTTP transport (caching, validation, partial retrieval,
>>etc.). Also saves a trip into the PHP output buffer.
>>[/color]
>
>
> Working on it as we converse, will be in ver 1.5, I added a few things check
> it out.
>
>[color=green]
>>One more suggestion: before calling readfile(), do a session_write_c lose()
>>to remove the session lock if a session is opened.[/color]
>
>
> Please explain, can you elaborate?
>
> --
> Mike Bradley
> http://www.gzentools.com -- free online php tools
>
>[/color]

I dig this:
gzImageSetCache Dir(dir[,url]);
That's hot.

- Dan

Daniel Tripp - Department of English

http://www.dantripp.com/

**Chung Leong** · Jul 17 '05, 02:44 AM

Re: Dynamic images

Two PHP scripts cannot access the same session simultaneously. If the
browser tries to download two images concurrently, and a session is opened
(say, if auto session is used), one of them will stall until the other is
done, unless you release the session with a call to session_write_c lose().

Uzytkownik "CountScubu la" <me@scantek.hot mail.com> napisal w wiadomosci
news:LAGQb.5688 $F84.5372@newss vr29.news.prodi gy.com...[color=blue]
> "Chung Leong" <chernyshevsky@ hotmail.com> wrote in message
> news:7o6dncz6w7-thY7dRVn-iQ@comcast.com. ..[color=green]
> > Yup, let Apache send the image, since it's pretty good at dealing with[/color][/color]
the[color=blue][color=green]
> > nitty gritty of HTTP transport (caching, validation, partial retrieval,
> > etc.). Also saves a trip into the PHP output buffer.
> >[/color]
>
> Working on it as we converse, will be in ver 1.5, I added a few things[/color]
check[color=blue]
> it out.
>[color=green]
> > One more suggestion: before calling readfile(), do a[/color][/color]
session_write_c lose()[color=blue][color=green]
> > to remove the session lock if a session is opened.[/color]
>
> Please explain, can you elaborate?
>
> --
> Mike Bradley
> http://www.gzentools.com -- free online php tools
>
>[/color]

Dynamic images

Dynamic images

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