Documention for "file" api

SDL Development
1

hello,

I was unable to find any documentation on SDL file functions. These
functions seem to be SDL_rwops.c and SDL_rwops.h. I have looked at the
source and dont fully understand the SDL_RWops structure. Any documentation
would be appreciated.

Also, I am trying to write a program that will display “raw” image data to
the screen. For example, I have this file format called .SHP (from Command
& Conquer game) that is a file filled with compressed images. I wrote a
function to decompress a single image and save the decompressed data
without a header or anything. Do you have any pointers on how to display
that type of graphic (it does require a palette also). To link the two
questions, I noticed heavy use of the SDL_RWops structure in the SDL_Image
library and though it could prove useful in my problem.

Thanks,
Kareem

2

hello,

I was unable to find any documentation on SDL file functions. These
functions seem to be SDL_rwops.c and SDL_rwops.h. I have looked at the
source and dont fully understand the SDL_RWops structure. Any documentation
would be appreciated.

It’s modeled very similarly to the stdio API, which is widely documented.

Also, I am trying to write a program that will display “raw” image data to
the screen. For example, I have this file format called .SHP (from Command
& Conquer game) that is a file filled with compressed images. I wrote a
function to decompress a single image and save the decompressed data
without a header or anything. Do you have any pointers on how to display
that type of graphic (it does require a palette also). To link the two
questions, I noticed heavy use of the SDL_RWops structure in the SDL_Image
library and though it could prove useful in my problem.

You probably don’t need to worry about the file functions. You should
create an 8-bit SDL surface using the SDL_CreateRGBSurface() function,
and then copy the palette information into an array of SDL_Color structs
and set the palette of the surface with SDL_SetColors().

Try asking on the IRC channel if you need more help, or on the mailing
list if nobody is around.

See ya!
-Sam Lantinga, Lead Programmer, Loki Entertainment Software

3

You probably don’t need to worry about the file functions. You should
create an 8-bit SDL surface using the SDL_CreateRGBSurface() function,
and then copy the palette information into an array of SDL_Color structs
and set the palette of the surface with SDL_SetColors().

Try asking on the IRC channel if you need more help, or on the mailing
list if nobody is around.

See ya!
-Sam Lantinga, Lead Programmer, Loki Entertainment Software

Where is the irc channel? And also, after i set the palette how do I load
the pixels?

Thanks