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-
- Documentation For The ShowBMP2 Unit.
- Compiled March 28, 1993.
- Written By Mike Stone.
-
- The author hereby disclaims all warranties relating to this software,
- whether expressed or implied, including without limitation any
- implied warranties or merchantability or fitness for a particular
- purpose. I will not be liable for any special, incidental, consequential,
- indirect, or similar damages due to loss of data/damage to hardware or
- any other reason, even if I have been advised of the possibility of
- such damages.
-
- Moving right along.. this software is released as freeware and you
- are welcome to distribute it to anyone and everyone, and to use it in
- your own programs. (And don't worry about annoying "Please Register Me"
- messages in the .tpu).
-
- This is the update for Show_BMP.zip, and comes with one new procedure
- and one new function.
- All the unit does is display 64768 byte bitmapped files in
- 320x200x256c mode. I was messing around with bitmaps and had this code
- around so I thought i'd release it after I saw some messages about
- people trying to display bitmaps. Its nothing monumental but it works and
- does so fairly fast. Although you won't get the compression you have in
- gif's and pcx's, binary's are faster on the display and are much easier to
- manipulate. There is one new procedure you can all with show_bmp. Here
- are all the procedures together:
-
- 1) SetVideoMode (mode:byte);
- 2) ShowBmp (BitmapToBeShown:string, Fastdisplay:boolean);
- 3) Fadeout ;
-
- And one function:
-
- 1) VGA256Exist:boolean;
-
- I included the SetVideomode procedure just in case you don't know how to
- change the video mode to $13 (320x200x256c). Then all you have to do
- once you have the correct mode, is call Showbmp with the filename of
- the bitmapped you want displayed. So:
-
- SetVideoMode($13);
- ShowBmp('Example.bin',false); {Call with the name of the Bmp to show}
- Textmode(Co80); {Don't forget this when ending your program!}
-
- Don't try initiating the .bgi drivers and calling ShowBmp! ShowBmp will
- probably work with other resolutions other than 320x200, but you'll get a
- smaller picture or really screw things up (so do it at your own risk!).
- VGA256Exist is a function that will return "true" if the adaptor
- supports VGA 256c. It isn't guarenteed to work, but on the few computers
- I have tried it on, it has returned the correct results.
- As for the new procedure, Fadeout will fade the picture out (obviously!)
- and there is also a new feature. When displaying your bitmap, you
- can display them the way described above, or this new way:
-
- SetVideoMode($13);
- ShowBMP('Example.bin',true);
- Textmode(Co80);
-
- You will find the screen write to be extremely quick, and coupled with
- the fade, something you can dazzle your friends with (grin). Unfortunately
- additional care must be taken to avoid unpleasant situations. Firstly,
- using this routine this way, may not work with all adaptors, but should
- with most standard models. Next, the double check in the unit to make sure
- that Mode $13 has been initiated has been removed, so make sure you
- call SetVideoMode.
-
- Now about the actual data files used. They MUST be 64768 bytes long, and
- no error checking is made (neither is there any error checking when setting
- the video mode to see if the users adapter can handle that mode). I came
- across three utilities that can help in making the needed .bin files.
- First there is the grab.exe utility that comes with Anivga11.zip.Although
- it makes two files they can easily be combined, HOWEVER it seems that the
- images they "grab" are sixteen copies of the picture captured (if you
- understand what I mean), so although it makes for a nice special effect,
- it isn't very useful (thought i'd mention it though in case someone tried
- using it). Oh, and also it has a 3 byte .pic header, so that will really
- mess things up.
- Second I have heard of another grab.exe that makes .bin files (not .pic)
- and that should work fine from what I know of it (although I have never
- used it myself).
- The third program is called intro.exe and comes with a supporting
- utility called Gif2Bmp v1.0. I am not sure where I got it from but it
- works ideally.
-
- One final note, the Unit was compiled with the $G+ directive, so
- it will only run on 286+ CPU's. This was to make the fading routine
- work properly (and quickly enough).
-
- Btw.. the unit is now written mainly in Assembly and compiled with
- Turbo Pascal 6.0 and, once again, may not display properly on all VGA cards.
-